Neukonstruktion
This commit is contained in:
parent
1af64ace95
commit
aab06c8ea8
@ -1,9 +1,9 @@
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Microsoft Visual Studio Solution File, Format Version 12.00
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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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# Visual Studio 15
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VisualStudioVersion = 15.0.25914.0
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VisualStudioVersion = 15.0.25920.0
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MinimumVisualStudioVersion = 10.0.40219.1
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SMTPServer", "SMTPServer\SMTPServer.csproj", "{ABB6A3E6-38B6-4D02-AC9C-91FA69CF03BE}"
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MailServer", "MailServer\MailServer.csproj", "{ABB6A3E6-38B6-4D02-AC9C-91FA69CF03BE}"
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EndProject
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EndProject
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{D43013F8-933F-4ADC-8943-08E91662A070}"
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Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{D43013F8-933F-4ADC-8943-08E91662A070}"
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EndProject
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EndProject
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199
MailServer/MailServer/DNS/DnsErrorCode.cs
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199
MailServer/MailServer/DNS/DnsErrorCode.cs
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////using System;
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////using System.Collections.Generic;
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////namespace DnsClient
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////{
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//// /*
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//// * Reference RFC6895#section-2.3
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//// *
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//// RCODE Name Description Reference
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//// Decimal
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//// Hexadecimal
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//// 0 NoError No Error [RFC1035]
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//// 1 FormErr Format Error [RFC1035]
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//// 2 ServFail Server Failure [RFC1035]
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//// 3 NXDomain Non-Existent Domain [RFC1035]
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//// 4 NotImp Not Implemented [RFC1035]
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//// 5 Refused Query Refused [RFC1035]
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//// 6 YXDomain Name Exists when it should not [RFC2136]
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//// 7 YXRRSet RR Set Exists when it should not [RFC2136]
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//// 8 NXRRSet RR Set that should exist does not [RFC2136]
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//// 9 NotAuth Server Not Authoritative for zone [RFC2136]
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//// 9 NotAuth Not Authorized [RFC2845]
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//// 10 NotZone Name not contained in zone [RFC2136]
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//// 11 - 15
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//// 0xB - 0xF Unassigned
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//// 16 BADVERS Bad OPT Version [RFC6891]
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//// 16 BADSIG TSIG Signature Failure [RFC2845]
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//// 17 BADKEY Key not recognized [RFC2845]
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//// 18 BADTIME Signature out of time window [RFC2845]
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//// 19 BADMODE Bad TKEY Mode [RFC2930]
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//// 20 BADNAME Duplicate key name [RFC2930]
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//// 21 BADALG Algorithm not supported [RFC2930]
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//// 22 BADTRUNC Bad Truncation [RFC4635]
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//// 23 - 3,840
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//// 0x0017 - 0x0F00 Unassigned
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//// 3,841 - 4,095
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//// 0x0F01 - 0x0FFF Reserved for Private Use
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//// 4,096 - 65,534
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//// 0x1000 - 0xFFFE Unassigned
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//// 65,535
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//// 0xFFFF Reserved; can only be allocated by Standards
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//// Action.
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//// */
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//// public enum DnsErrorCode : ushort
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//// {
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//// NoError = 0,
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//// FormErr = 1,
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//// ServFail = 2,
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//// NXDomain = 3,
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//// NotImp = 4,
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//// Refused = 5,
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//// YXDomain = 6,
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//// YXRRSet = 7,
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//// NXRRSet = 8,
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//// NotAuth = 9,
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//// NotZone = 10,
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//// BADVERS = 16, // or BADSIG
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//// BADKEY = 17,
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//// BADTIME = 18,
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//// BADMODE = 19,
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//// BADNAME = 20,
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//// BADALG = 21,
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//// BADTRUNC = 22,
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//// BADCOOKIE = 23,
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//// Unassigned = 666
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//// }
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//// public static class DnsErrorCodeText
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//// {
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//// public const string BADALG = "Algorithm not supported";
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//// public const string BADCOOKIE = "Bad/missing Server Cookie";
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//// public const string BADKEY = "Key not recognized";
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//// public const string BADMODE = "Bad TKEY Mode";
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//// public const string BADNAME = "Duplicate key name";
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//// public const string BADSIG = "TSIG Signature Failure";
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//// public const string BADTIME = "Signature out of time window";
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//// public const string BADTRUNC = "Bad Truncation";
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//// public const string BADVERS = "Bad OPT Version";
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//// public const string FormErr = "Format Error";
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//// public const string NoError = "No Error";
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//// public const string NotAuth = "Server Not Authoritative for zone or Not Authorized";
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//// public const string NotImp = "Not Implemented";
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//// public const string NotZone = "Name not contained in zone";
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//// public const string NXDomain = "Non-Existent Domain";
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//// public const string NXRRSet = "RR Set that should exist does not";
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//// public const string Refused = "Query Refused";
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//// public const string ServFail = "Server Failure";
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//// public const string Unassigned = "Unknown Error";
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//// public const string YXDomain = "Name Exists when it should not";
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//// public const string YXRRSet = "RR Set Exists when it should not";
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//// private static readonly Dictionary<DnsErrorCode, string> errors = new Dictionary<DnsErrorCode, string>()
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//// {
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//// { DnsErrorCode.NoError, DnsErrorCodeText.NoError },
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//// { DnsErrorCode.FormErr, DnsErrorCodeText.FormErr },
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//// { DnsErrorCode.ServFail, DnsErrorCodeText.ServFail },
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//// { DnsErrorCode.NXDomain, DnsErrorCodeText.NXDomain },
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//// { DnsErrorCode.NotImp, DnsErrorCodeText.NotImp },
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//// { DnsErrorCode.Refused, DnsErrorCodeText.Refused },
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//// { DnsErrorCode.YXDomain, DnsErrorCodeText.YXDomain },
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//// { DnsErrorCode.YXRRSet, DnsErrorCodeText.YXRRSet },
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//// { DnsErrorCode.NXRRSet, DnsErrorCodeText.NXRRSet },
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//// { DnsErrorCode.NotAuth, DnsErrorCodeText.NotAuth },
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//// { DnsErrorCode.NotZone, DnsErrorCodeText.NotZone },
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//// { DnsErrorCode.BADVERS, DnsErrorCodeText.BADVERS },
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//// { DnsErrorCode.BADKEY, DnsErrorCodeText.BADKEY },
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//// { DnsErrorCode.BADTIME, DnsErrorCodeText.BADTIME },
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//// { DnsErrorCode.BADMODE, DnsErrorCodeText.BADMODE },
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//// { DnsErrorCode.BADNAME, DnsErrorCodeText.BADNAME },
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//// { DnsErrorCode.BADALG, DnsErrorCodeText.BADALG },
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//// { DnsErrorCode.BADTRUNC, DnsErrorCodeText.BADTRUNC },
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//// { DnsErrorCode.BADCOOKIE, DnsErrorCodeText.BADCOOKIE },
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//// };
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//// public static string GetErrorText(DnsErrorCode code)
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//// {
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//// if (!errors.ContainsKey(code))
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//// {
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//// return Unassigned;
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//// }
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//// return errors[code];
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//// }
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//// }
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//// public class DnsErrorException : Exception
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//// {
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//// public DnsErrorCode Code { get; }
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//// public string DnsError { get; }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with <see cref="DnsErrorCode.Unassigned"/>.
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//// /// </summary>
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//// public DnsErrorException() : base(DnsErrorCodeText.Unassigned)
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//// {
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//// Code = DnsErrorCode.Unassigned;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with <see cref="DnsErrorCode.Unassigned"/>
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//// /// and a custom message.
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//// /// </summary>
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//// public DnsErrorException(string message) : base(message)
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//// {
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//// Code = DnsErrorCode.Unassigned;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with
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//// /// the standard error text for this <paramref name="code"/>.
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//// /// </summary>
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//// public DnsErrorException(DnsErrorCode code) : base(DnsErrorCodeText.GetErrorText(code))
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//// {
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//// Code = code;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with <see cref="DnsErrorCode.Unassigned"/>
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//// /// and a custom message.
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//// /// </summary>
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//// public DnsErrorException(string message, Exception innerException) : base(message, innerException)
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//// {
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//// Code = DnsErrorCode.Unassigned;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with a custom message
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//// /// and the given <paramref name="code"/>.
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//// /// </summary>
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//// public DnsErrorException(DnsErrorCode code, string message) : base(message)
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//// {
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//// Code = code;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// /// <summary>
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//// /// Creates an instance of <see cref="DnsErrorException"/> with a custom message
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//// /// and the given <paramref name="code"/>.
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//// /// </summary>
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//// public DnsErrorException(DnsErrorCode code, string message, Exception innerException) : base(message, innerException)
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//// {
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//// Code = code;
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//// DnsError = DnsErrorCodeText.GetErrorText(Code);
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//// }
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//// }
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////}
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47
MailServer/MailServer/DNS/DnsHeaderFlag.cs
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47
MailServer/MailServer/DNS/DnsHeaderFlag.cs
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using System;
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namespace DnsClient
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{
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/* Reference: https://tools.ietf.org/html/rfc6895#section-2
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* Response header fields
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*
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1 1 1 1 1 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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| ID |
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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==> |QR| OpCode |AA|TC|RD|RA| Z|AD|CD| RCODE | <==
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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| QDCOUNT/ZOCOUNT |
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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| ANCOUNT/PRCOUNT |
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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| NSCOUNT/UPCOUNT |
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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| ARCOUNT |
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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* */
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/// <summary>
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/// The flags of the header's second 16bit value
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/// </summary>
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public enum DnsHeaderFlag : ushort
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{
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IsCheckingDisabled = 0x0010,
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IsAuthenticData = 0x0020,
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FutureUse = 0x0040, // Z bit seems to be ignored now, see https://tools.ietf.org/html/rfc6895#section-2.1
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RecursionAvailable = 0x0080,
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RecursionDesired = 0x0100,
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ResultTruncated = 0x0200,
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HasAuthorityAnswer = 0x0400,
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HasQuery = 0x8000,
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}
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public static class DnsHeader
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{
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public static readonly ushort OPCODE_MASK = 0x7800;
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public static readonly ushort OPCODE_SHIFT = 11;
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public static readonly ushort RCODE_MASK = 0x000F;
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}
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}
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101
MailServer/MailServer/DNS/DnsMessageHandler.cs
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101
MailServer/MailServer/DNS/DnsMessageHandler.cs
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@ -0,0 +1,101 @@
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using System;
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using System.Net;
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using System.Threading;
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using System.Threading.Tasks;
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using DnsClient.Protocol;
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namespace DnsClient
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{
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public abstract class DnsMessageHandler : IDisposable
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{
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|
private bool _disposedValue = false;
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|
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||||||
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public abstract Task<DnsResponseMessage> QueryAsync(IPEndPoint server, DnsRequestMessage request, CancellationToken cancellationToken);
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|
|
||||||
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public abstract bool IsTransientException<T>(T exception) where T : Exception;
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|
|
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public virtual byte[] GetRequestData(DnsRequestMessage request)
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{
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var question = request.Question;
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var questionData = question.QueryName.AsBytes();
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|
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// 4 more bytes for the type and class
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var writer = new DnsDatagramWriter(DnsRequestHeader.HeaderLength + questionData.Length + 4);
|
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|
|
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|
writer.SetInt16Network((short)request.Header.Id);
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|
writer.SetUInt16Network(request.Header.RawFlags);
|
||||||
|
writer.SetInt16Network((short)request.Header.QuestionCount);
|
||||||
|
|
||||||
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// jump to end of header, we didn't write all fields
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writer.Index = DnsRequestHeader.HeaderLength;
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||||||
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|
||||||
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writer.SetBytes(questionData, questionData.Length);
|
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|
writer.SetUInt16Network((ushort)question.QuestionType);
|
||||||
|
writer.SetUInt16Network((ushort)question.QuestionClass);
|
||||||
|
|
||||||
|
return writer.Data;
|
||||||
|
}
|
||||||
|
|
||||||
|
public virtual DnsResponseMessage GetResponseMessage(byte[] responseData)
|
||||||
|
{
|
||||||
|
var reader = new DnsDatagramReader(responseData);
|
||||||
|
var factory = new DnsRecordFactory(reader);
|
||||||
|
|
||||||
|
var id = reader.ReadUInt16Reverse();
|
||||||
|
var flags = reader.ReadUInt16Reverse();
|
||||||
|
var questionCount = reader.ReadUInt16Reverse();
|
||||||
|
var answerCount = reader.ReadUInt16Reverse();
|
||||||
|
var nameServerCount = reader.ReadUInt16Reverse();
|
||||||
|
var additionalCount = reader.ReadUInt16Reverse();
|
||||||
|
|
||||||
|
var header = new DnsResponseHeader(id, flags, questionCount, answerCount, additionalCount, nameServerCount);
|
||||||
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var response = new DnsResponseMessage(header);
|
||||||
|
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||||||
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for (int questionIndex = 0; questionIndex < questionCount; questionIndex++)
|
||||||
|
{
|
||||||
|
var question = new DnsQuestion(reader.ReadName(), (QueryType)reader.ReadUInt16Reverse(), (QueryClass)reader.ReadUInt16Reverse());
|
||||||
|
response.AddQuestion(question);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int answerIndex = 0; answerIndex < answerCount; answerIndex++)
|
||||||
|
{
|
||||||
|
var info = factory.ReadRecordInfo();
|
||||||
|
var record = factory.GetRecord(info);
|
||||||
|
response.AddAnswer(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int serverIndex = 0; serverIndex < nameServerCount; serverIndex++)
|
||||||
|
{
|
||||||
|
var info = factory.ReadRecordInfo();
|
||||||
|
var record = factory.GetRecord(info);
|
||||||
|
response.AddAuthority(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int additionalIndex = 0; additionalIndex < additionalCount; additionalIndex++)
|
||||||
|
{
|
||||||
|
var info = factory.ReadRecordInfo();
|
||||||
|
var record = factory.GetRecord(info);
|
||||||
|
response.AddAdditional(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
return response;
|
||||||
|
}
|
||||||
|
|
||||||
|
protected virtual void Dispose(bool disposing)
|
||||||
|
{
|
||||||
|
if (!_disposedValue)
|
||||||
|
{
|
||||||
|
if (disposing)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
_disposedValue = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public void Dispose()
|
||||||
|
{
|
||||||
|
Dispose(true);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
350
MailServer/MailServer/DNS/DnsName.cs
Normal file
350
MailServer/MailServer/DNS/DnsName.cs
Normal file
@ -0,0 +1,350 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class DnsName : IComparable
|
||||||
|
{
|
||||||
|
private const byte ReferenceByte = 0xc0;
|
||||||
|
private List<string> _labels = new List<string>();
|
||||||
|
private short _octets = 1;
|
||||||
|
|
||||||
|
public bool HasRootLabel => (_labels.Count > 0 && Get(0).Equals(""));
|
||||||
|
|
||||||
|
public bool IsEmpty => Size == 0;
|
||||||
|
|
||||||
|
public bool IsHostName => !_labels.Any(p => !IsHostNameLabel(p));
|
||||||
|
|
||||||
|
public int Octets => _octets;
|
||||||
|
|
||||||
|
public int Size => _labels.Where(p => p != "").Count();
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an empty <see cref="DnsName"/> instance.
|
||||||
|
/// </summary>
|
||||||
|
public DnsName()
|
||||||
|
{
|
||||||
|
Add(0, "");
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Initializes a new instance of <see cref="DnsName"/> by parsing the <paramref name="name"/>.
|
||||||
|
/// </summary>
|
||||||
|
/// <param name="name">The input name.</param>
|
||||||
|
public DnsName(string name)
|
||||||
|
{
|
||||||
|
if (name == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(name));
|
||||||
|
}
|
||||||
|
|
||||||
|
if (name.Length > 0)
|
||||||
|
{
|
||||||
|
Parse(name);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!HasRootLabel) Add(0, "");
|
||||||
|
}
|
||||||
|
|
||||||
|
public static DnsName FromBytes(byte[] data, ref int offset)
|
||||||
|
{
|
||||||
|
if (data == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(data));
|
||||||
|
}
|
||||||
|
if (offset > data.Length - 1)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(offset));
|
||||||
|
}
|
||||||
|
|
||||||
|
var result = new DnsName();
|
||||||
|
|
||||||
|
// read the length byte for the label, then get the content from offset+1 to length
|
||||||
|
// proceed till we reach zero length byte.
|
||||||
|
byte length;
|
||||||
|
while ((length = data[offset++]) != 0)
|
||||||
|
{
|
||||||
|
// respect the reference bit and lookup the name at the given position
|
||||||
|
// the reader will advance only for the 2 bytes read.
|
||||||
|
if ((length & ReferenceByte) != 0)
|
||||||
|
{
|
||||||
|
var subset = (length & 0x3f) << 8 | data[offset++];
|
||||||
|
var subName = FromBytes(data, ref subset);
|
||||||
|
result.Concat(subName);
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (offset + length > data.Length - 1)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(
|
||||||
|
nameof(data),
|
||||||
|
$"Found invalid label position {offset - 1} or length {length} in the source data.");
|
||||||
|
}
|
||||||
|
|
||||||
|
var label = Encoding.ASCII.GetString(data, offset, length);
|
||||||
|
result.Add(1, label);
|
||||||
|
offset += length;
|
||||||
|
}
|
||||||
|
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void Add(int pos, string label)
|
||||||
|
{
|
||||||
|
if (label == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(label));
|
||||||
|
}
|
||||||
|
if (pos < 0 || pos > _labels.Count)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(pos));
|
||||||
|
}
|
||||||
|
// Check for empty labels: may have only one, and only at end.
|
||||||
|
int len = label.Length;
|
||||||
|
if ((pos > 0 && len == 0) ||
|
||||||
|
(pos == 0 && HasRootLabel))
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Empty label must be the last label in a domain name");
|
||||||
|
}
|
||||||
|
|
||||||
|
// Total length must not be larger than 255 characters (including the ending zero).
|
||||||
|
if (len > 0)
|
||||||
|
{
|
||||||
|
if (_octets + len + 1 >= 256)
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Name too long");
|
||||||
|
}
|
||||||
|
_octets += (short)(len + 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
int i = _labels.Count - pos;
|
||||||
|
VerifyLabel(label);
|
||||||
|
_labels.Insert(i, label);
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] AsBytes()
|
||||||
|
{
|
||||||
|
var bytes = new byte[_octets];
|
||||||
|
var offset = 0;
|
||||||
|
for (int i = _labels.Count - 1; i >= 0; i--)
|
||||||
|
{
|
||||||
|
var label = Get(i);
|
||||||
|
|
||||||
|
// should never cause issues as each label's length is limited to 64 chars.
|
||||||
|
var len = checked((byte)label.Length);
|
||||||
|
|
||||||
|
// set the label length byte
|
||||||
|
bytes[offset++] = len;
|
||||||
|
|
||||||
|
// set the label's content
|
||||||
|
var labelBytes = Encoding.ASCII.GetBytes(label);
|
||||||
|
Array.ConstrainedCopy(labelBytes, 0, bytes, offset, len);
|
||||||
|
|
||||||
|
offset += len;
|
||||||
|
}
|
||||||
|
|
||||||
|
return bytes;
|
||||||
|
}
|
||||||
|
|
||||||
|
public int CompareTo(object obj)
|
||||||
|
{
|
||||||
|
if (obj == null)
|
||||||
|
{
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ToString().CompareTo(obj.ToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
public void Concat(DnsName other)
|
||||||
|
{
|
||||||
|
if (other == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(other));
|
||||||
|
}
|
||||||
|
|
||||||
|
foreach (var label in other._labels.Where(p => !string.IsNullOrWhiteSpace(p)))
|
||||||
|
{
|
||||||
|
Add(1, label);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public override bool Equals(object obj)
|
||||||
|
{
|
||||||
|
if (obj == null)
|
||||||
|
{
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
var otherName = obj as DnsName;
|
||||||
|
if (otherName == null)
|
||||||
|
{
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return CompareTo(otherName) == 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
public string Get(int pos)
|
||||||
|
{
|
||||||
|
if (pos < 0 || pos > _labels.Count)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(pos));
|
||||||
|
}
|
||||||
|
|
||||||
|
return _labels[_labels.Count - pos - 1];
|
||||||
|
}
|
||||||
|
|
||||||
|
public override int GetHashCode()
|
||||||
|
{
|
||||||
|
return ToString().GetHashCode();
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string ToString()
|
||||||
|
{
|
||||||
|
var buf = new StringBuilder();
|
||||||
|
foreach (var label in _labels)
|
||||||
|
{
|
||||||
|
if (buf.Length > 0 || label.Length == 0)
|
||||||
|
{
|
||||||
|
buf.Append('.');
|
||||||
|
}
|
||||||
|
|
||||||
|
Escaped(buf, label);
|
||||||
|
}
|
||||||
|
|
||||||
|
var name = buf.ToString();
|
||||||
|
|
||||||
|
return name;
|
||||||
|
}
|
||||||
|
|
||||||
|
private static bool IsHostNameChar(char c)
|
||||||
|
{
|
||||||
|
return (c == '-' ||
|
||||||
|
c >= 'a' && c <= 'z' ||
|
||||||
|
c >= 'A' && c <= 'Z' ||
|
||||||
|
c >= '0' && c <= '9');
|
||||||
|
}
|
||||||
|
|
||||||
|
private static bool IsHostNameLabel(string label)
|
||||||
|
{
|
||||||
|
for (int i = 0; i < label.Length; i++)
|
||||||
|
{
|
||||||
|
char c = label.ElementAt(i);
|
||||||
|
if (!IsHostNameChar(c))
|
||||||
|
{
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return !(label.StartsWith("-") || label.EndsWith("-"));
|
||||||
|
}
|
||||||
|
|
||||||
|
private static void VerifyLabel(string label)
|
||||||
|
{
|
||||||
|
// http://www.freesoft.org/CIE/RFC/1035/9.htm
|
||||||
|
// dns name limits are 63octets per label
|
||||||
|
// (63 letters).(63 letters).(63 letters).(62 letters)
|
||||||
|
if (label.Length > 63)
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Label exceeds 63 octets: " + label);
|
||||||
|
}
|
||||||
|
|
||||||
|
// Check for two-byte characters.
|
||||||
|
for (int i = 0; i < label.Length; i++)
|
||||||
|
{
|
||||||
|
char c = label.ElementAt(i);
|
||||||
|
if ((c & 0xFF00) != 0)
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Label has two-byte char: " + label);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private void Escaped(StringBuilder buf, string label)
|
||||||
|
{
|
||||||
|
for (int i = 0; i < label.Length; i++)
|
||||||
|
{
|
||||||
|
char c = label.ElementAt(i);
|
||||||
|
if (c == '.' || c == '\\')
|
||||||
|
{
|
||||||
|
buf.Append('\\');
|
||||||
|
}
|
||||||
|
|
||||||
|
buf.Append(c);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private char GetEscaped(string domainName, int pos)
|
||||||
|
{
|
||||||
|
try
|
||||||
|
{
|
||||||
|
// assert (name.charAt(pos) == '\\');
|
||||||
|
char c1 = domainName.ElementAt(++pos);
|
||||||
|
if (IsDigit(c1))
|
||||||
|
{
|
||||||
|
// sequence is `\DDD'
|
||||||
|
char c2 = domainName.ElementAt(++pos);
|
||||||
|
char c3 = domainName.ElementAt(++pos);
|
||||||
|
if (IsDigit(c2) && IsDigit(c3))
|
||||||
|
{
|
||||||
|
return (char)((c1 - '0') * 100 + (c2 - '0') * 10 + (c3 - '0'));
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
throw new ArgumentException("Invalid escape sequence.", nameof(domainName));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
return c1;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
catch (ArgumentOutOfRangeException)
|
||||||
|
{
|
||||||
|
throw new ArgumentException("Invalid escape sequence.", nameof(domainName));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private bool IsDigit(char c)
|
||||||
|
{
|
||||||
|
return (c >= '0' && c <= '9');
|
||||||
|
}
|
||||||
|
|
||||||
|
private void Parse(string domainName)
|
||||||
|
{
|
||||||
|
var label = new StringBuilder();
|
||||||
|
|
||||||
|
for (int index = 0; index < domainName.Length; index++)
|
||||||
|
{
|
||||||
|
var c = domainName[index];
|
||||||
|
|
||||||
|
if (c == '\\')
|
||||||
|
{
|
||||||
|
c = GetEscaped(domainName, index++);
|
||||||
|
if (IsDigit(domainName[index]))
|
||||||
|
{
|
||||||
|
index += 2;
|
||||||
|
}
|
||||||
|
|
||||||
|
label.Append(c);
|
||||||
|
}
|
||||||
|
else if (c != '.')
|
||||||
|
{
|
||||||
|
label.Append(c);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
Add(0, label.ToString());
|
||||||
|
label.Clear();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (label.Length > 0)
|
||||||
|
{
|
||||||
|
Add(0, label.ToString());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
66
MailServer/MailServer/DNS/DnsOpCode.cs
Normal file
66
MailServer/MailServer/DNS/DnsOpCode.cs
Normal file
@ -0,0 +1,66 @@
|
|||||||
|
using System;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
*
|
||||||
|
* Reference: [RFC6895][RFC1035]
|
||||||
|
0 Query [RFC1035]
|
||||||
|
1 IQuery (Inverse Query, OBSOLETE) [RFC3425]
|
||||||
|
2 Status [RFC1035]
|
||||||
|
3 Unassigned
|
||||||
|
4 Notify [RFC1996]
|
||||||
|
5 Update [RFC2136]
|
||||||
|
6-15 Unassigned
|
||||||
|
* */
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFCs 1035, 1996, 2136, 3425.
|
||||||
|
/// Specifies kind of query in this message.
|
||||||
|
/// This value is set by the originator of a query and copied into the response.
|
||||||
|
/// </summary>
|
||||||
|
public enum DnsOpCode : short
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// A standard query.
|
||||||
|
/// </summary>
|
||||||
|
Query,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 3425.
|
||||||
|
/// An inverse query.
|
||||||
|
/// </summary>
|
||||||
|
[Obsolete]
|
||||||
|
IQuery,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// A server status request.
|
||||||
|
/// </summary>
|
||||||
|
Status,
|
||||||
|
|
||||||
|
Unassinged3,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1996.
|
||||||
|
/// </summary>
|
||||||
|
Notify,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136.
|
||||||
|
/// </summary>
|
||||||
|
Update,
|
||||||
|
|
||||||
|
Unassinged6,
|
||||||
|
Unassinged7,
|
||||||
|
Unassinged8,
|
||||||
|
Unassinged9,
|
||||||
|
Unassinged10,
|
||||||
|
Unassinged11,
|
||||||
|
Unassinged12,
|
||||||
|
Unassinged13,
|
||||||
|
Unassinged14,
|
||||||
|
Unassinged15,
|
||||||
|
}
|
||||||
|
}
|
117
MailServer/MailServer/DNS/DnsQueryResponse.cs
Normal file
117
MailServer/MailServer/DNS/DnsQueryResponse.cs
Normal file
@ -0,0 +1,117 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
using DnsClient.Protocol;
|
||||||
|
using DnsClient.Protocol.Record;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// Immutable version of the <see cref="DnsResponseMessage"/>.
|
||||||
|
/// </summary>
|
||||||
|
public class DnsQueryResponse
|
||||||
|
{
|
||||||
|
private int? _hashCode;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a list of additional records.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<DnsResourceRecord> Additionals { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a list of all answers, addtional and authority records.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<DnsResourceRecord> AllRecords
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return Answers.Concat(Additionals).Concat(Authorities).ToArray();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a list of answer records.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<DnsResourceRecord> Answers { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a list of authority records.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<DnsResourceRecord> Authorities { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Returns a string value representing the error response code in case an error occured, otherwise empty.
|
||||||
|
/// </summary>
|
||||||
|
public string ErrorMessage => HasError ? DnsResponseCodeText.GetErrorText(Header.ResponseCode) : string.Empty;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A flag indicating if the header contains a response codde other than <see cref="DnsResponseCode.NoError"/>.
|
||||||
|
/// </summary>
|
||||||
|
public bool HasError => Header?.ResponseCode != DnsResponseCode.NoError;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets the header of the response.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseHeader Header { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets the list of questions.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<DnsQuestion> Questions { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates a new instace of <see cref="DnsQueryResponse"/>.
|
||||||
|
/// </summary>
|
||||||
|
/// <see cref="DnsResponseMessage"/>
|
||||||
|
public DnsQueryResponse(
|
||||||
|
DnsResponseHeader header,
|
||||||
|
IReadOnlyCollection<DnsQuestion> questions,
|
||||||
|
IReadOnlyCollection<DnsResourceRecord> answers,
|
||||||
|
IReadOnlyCollection<DnsResourceRecord> additionals,
|
||||||
|
IReadOnlyCollection<DnsResourceRecord> authorities)
|
||||||
|
{
|
||||||
|
if (header == null) throw new ArgumentNullException(nameof(header));
|
||||||
|
if (questions == null) throw new ArgumentNullException(nameof(questions));
|
||||||
|
if (answers == null) throw new ArgumentNullException(nameof(answers));
|
||||||
|
if (additionals == null) throw new ArgumentNullException(nameof(additionals));
|
||||||
|
if (authorities == null) throw new ArgumentNullException(nameof(authorities));
|
||||||
|
|
||||||
|
Header = header;
|
||||||
|
Questions = questions;
|
||||||
|
Answers = answers;
|
||||||
|
Additionals = additionals;
|
||||||
|
Authorities = authorities;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <inheritdoc />
|
||||||
|
public override bool Equals(object obj)
|
||||||
|
{
|
||||||
|
if (obj == null)
|
||||||
|
{
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
var response = obj as DnsQueryResponse;
|
||||||
|
if (response == null)
|
||||||
|
{
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return
|
||||||
|
Header.ToString().Equals(response.Header.ToString())
|
||||||
|
&& string.Join("", Questions).Equals(string.Join("", response.Questions))
|
||||||
|
&& string.Join("", AllRecords).Equals(string.Join("", response.AllRecords));
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <inheritdoc />
|
||||||
|
public override int GetHashCode()
|
||||||
|
{
|
||||||
|
if (!_hashCode.HasValue)
|
||||||
|
{
|
||||||
|
_hashCode = (Header.ToString() + string.Join("", Questions) + string.Join("", AllRecords)).GetHashCode();
|
||||||
|
}
|
||||||
|
|
||||||
|
return _hashCode.Value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
40
MailServer/MailServer/DNS/DnsQuestion.cs
Normal file
40
MailServer/MailServer/DNS/DnsQuestion.cs
Normal file
@ -0,0 +1,40 @@
|
|||||||
|
using System;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class DnsQuestion
|
||||||
|
{
|
||||||
|
public DnsName QueryName { get; }
|
||||||
|
|
||||||
|
public QueryClass QuestionClass { get; }
|
||||||
|
|
||||||
|
public QueryType QuestionType { get; }
|
||||||
|
|
||||||
|
public DnsQuestion(string queryName, QueryType questionType, QueryClass questionClass)
|
||||||
|
: this(new DnsName(queryName), questionType, questionClass)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsQuestion(DnsName queryName, QueryType questionType, QueryClass questionClass)
|
||||||
|
{
|
||||||
|
if (queryName == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(queryName));
|
||||||
|
}
|
||||||
|
|
||||||
|
QueryName = queryName;
|
||||||
|
QuestionType = questionType;
|
||||||
|
QuestionClass = questionClass;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string ToString()
|
||||||
|
{
|
||||||
|
return ToString(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
public string ToString(int offset = -32)
|
||||||
|
{
|
||||||
|
return string.Format("{0,"+offset+"} \t{1} \t{2}", QueryName, QuestionClass, QuestionType);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
75
MailServer/MailServer/DNS/DnsRequestHeader.cs
Normal file
75
MailServer/MailServer/DNS/DnsRequestHeader.cs
Normal file
@ -0,0 +1,75 @@
|
|||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class DnsRequestHeader
|
||||||
|
{
|
||||||
|
public const int HeaderLength = 12;
|
||||||
|
|
||||||
|
private ushort _flags = 0;
|
||||||
|
|
||||||
|
public ushort RawFlags => _flags;
|
||||||
|
|
||||||
|
public DnsHeaderFlag HeaderFlags
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return (DnsHeaderFlag)_flags;
|
||||||
|
}
|
||||||
|
set
|
||||||
|
{
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.IsCheckingDisabled);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.IsAuthenticData);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.FutureUse);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.HasQuery);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.HasAuthorityAnswer);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.ResultTruncated);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.RecursionDesired);
|
||||||
|
_flags &= (ushort)~(DnsHeaderFlag.RecursionAvailable);
|
||||||
|
_flags |= (ushort)value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public int Id { get; set; }
|
||||||
|
|
||||||
|
public DnsOpCode OpCode
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return (DnsOpCode)((DnsHeader.OPCODE_MASK & _flags) >> DnsHeader.OPCODE_SHIFT);
|
||||||
|
}
|
||||||
|
set
|
||||||
|
{
|
||||||
|
_flags &= (ushort)~(DnsHeader.OPCODE_MASK);
|
||||||
|
_flags |= (ushort)(((ushort)value << DnsHeader.OPCODE_SHIFT) & DnsHeader.OPCODE_MASK);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public int QuestionCount { get; set; }
|
||||||
|
|
||||||
|
public bool UseRecursion
|
||||||
|
{
|
||||||
|
get { return (HeaderFlags | DnsHeaderFlag.RecursionDesired) != 0; }
|
||||||
|
set
|
||||||
|
{
|
||||||
|
HeaderFlags |= DnsHeaderFlag.RecursionDesired;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsRequestHeader(int id, int questionCount, DnsOpCode queryKind)
|
||||||
|
: this(id, questionCount, true, queryKind)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsRequestHeader(int id, int questionCount, bool useRecursion, DnsOpCode queryKind)
|
||||||
|
{
|
||||||
|
Id = id;
|
||||||
|
QuestionCount = questionCount;
|
||||||
|
OpCode = queryKind;
|
||||||
|
UseRecursion = useRecursion;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string ToString()
|
||||||
|
{
|
||||||
|
return $"{Id} - Qs: {QuestionCount} Recursion: {UseRecursion} OpCode: {OpCode}";
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
261
MailServer/MailServer/DNS/DnsResponseCode.cs
Normal file
261
MailServer/MailServer/DNS/DnsResponseCode.cs
Normal file
@ -0,0 +1,261 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* Reference RFC6895#section-2.3
|
||||||
|
*/
|
||||||
|
// <summary>
|
||||||
|
/// RFCs 1035, 2136, 2671, 2845, 2930, 4635.
|
||||||
|
/// </summary>
|
||||||
|
public enum DnsResponseCode : ushort
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// No error condition
|
||||||
|
/// </summary>
|
||||||
|
NoError = 0,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// Format error. The name server was unable to interpret the query.
|
||||||
|
/// </summary>
|
||||||
|
FormatError = 1,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// Server failure. The name server was unable to process this query due to a problem with the name server.
|
||||||
|
/// </summary>
|
||||||
|
ServerFailure = 2,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// Name Error. Meaningful only for responses from an authoritative name server,
|
||||||
|
/// this code signifies that the domain name referenced in the query does not exist.
|
||||||
|
/// </summary>
|
||||||
|
NotExistentDomain = 3,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// Not Implemented. The name server does not support the requested kind of query.
|
||||||
|
/// </summary>
|
||||||
|
NotImplemented = 4,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 1035.
|
||||||
|
/// Refused. The name server refuses to perform the specified operation for policy reasons.
|
||||||
|
/// For example, a name server may not wish to provide the information to the particular requester,
|
||||||
|
/// or a name server may not wish to perform a particular operation (e.g., zone transfer) for particular data.
|
||||||
|
/// </summary>
|
||||||
|
Refused = 5,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136.
|
||||||
|
/// Name Exists when it should not.
|
||||||
|
/// </summary>
|
||||||
|
ExistingDomain = 6,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136.
|
||||||
|
/// Resource record set exists when it should not.
|
||||||
|
/// </summary>
|
||||||
|
ExistingResourceRecordSet = 7,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136.
|
||||||
|
/// Resource record set that should exist but does not.
|
||||||
|
/// </summary>
|
||||||
|
MissingResourceRecordSet = 8,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136 / RFC2845
|
||||||
|
/// Server Not Authoritative for zone / Not Authorized.
|
||||||
|
/// </summary>
|
||||||
|
NotAuthorized = 9,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2136.
|
||||||
|
/// Name not contained in zone.
|
||||||
|
/// </summary>
|
||||||
|
NotZone = 10,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFCs 2671 / 2845.
|
||||||
|
/// Bad OPT Version or TSIG Signature Failure.
|
||||||
|
/// </summary>
|
||||||
|
BadVersionOrBadSignature = 16,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2845.
|
||||||
|
/// Key not recognized.
|
||||||
|
/// </summary>
|
||||||
|
BadKey = 17,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2845.
|
||||||
|
/// Signature out of time window.
|
||||||
|
/// </summary>
|
||||||
|
BadTime = 18,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2930.
|
||||||
|
/// Bad TKEY Mode.
|
||||||
|
/// </summary>
|
||||||
|
BadMode = 19,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2930.
|
||||||
|
/// Duplicate key name.
|
||||||
|
/// </summary>
|
||||||
|
BadName = 20,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 2930.
|
||||||
|
/// Algorithm not supported.
|
||||||
|
/// </summary>
|
||||||
|
BadAlgorithm = 21,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 4635.
|
||||||
|
/// BADTRUNC - Bad Truncation.
|
||||||
|
/// </summary>
|
||||||
|
BadTruncation = 22,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RFC 7873
|
||||||
|
/// Bad/missing Server Cookie
|
||||||
|
/// </summary>
|
||||||
|
BadCookie = 23,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Unknown error.
|
||||||
|
/// </summary>
|
||||||
|
Unassigned = 666
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
public static class DnsResponseCodeText
|
||||||
|
{
|
||||||
|
internal const string BADALG = "Algorithm not supported";
|
||||||
|
internal const string BADCOOKIE = "Bad/missing Server Cookie";
|
||||||
|
internal const string BADKEY = "Key not recognized";
|
||||||
|
internal const string BADMODE = "Bad TKEY Mode";
|
||||||
|
internal const string BADNAME = "Duplicate key name";
|
||||||
|
internal const string BADSIG = "TSIG Signature Failure";
|
||||||
|
internal const string BADTIME = "Signature out of time window";
|
||||||
|
internal const string BADTRUNC = "Bad Truncation";
|
||||||
|
internal const string BADVERS = "Bad OPT Version";
|
||||||
|
internal const string FormErr = "Format Error";
|
||||||
|
internal const string NoError = "No Error";
|
||||||
|
internal const string NotAuth = "Server Not Authoritative for zone or Not Authorized";
|
||||||
|
internal const string NotImp = "Not Implemented";
|
||||||
|
internal const string NotZone = "Name not contained in zone";
|
||||||
|
internal const string NXDomain = "Non-Existent Domain";
|
||||||
|
internal const string NXRRSet = "RR Set that should exist does not";
|
||||||
|
internal const string Refused = "Query Refused";
|
||||||
|
internal const string ServFail = "Server Failure";
|
||||||
|
internal const string Unassigned = "Unknown Error";
|
||||||
|
internal const string YXDomain = "Name Exists when it should not";
|
||||||
|
internal const string YXRRSet = "RR Set Exists when it should not";
|
||||||
|
|
||||||
|
private static readonly Dictionary<DnsResponseCode, string> errors = new Dictionary<DnsResponseCode, string>()
|
||||||
|
{
|
||||||
|
{ DnsResponseCode.NoError, DnsResponseCodeText.NoError },
|
||||||
|
{ DnsResponseCode.FormatError, DnsResponseCodeText.FormErr },
|
||||||
|
{ DnsResponseCode.ServerFailure, DnsResponseCodeText.ServFail },
|
||||||
|
{ DnsResponseCode.NotExistentDomain, DnsResponseCodeText.NXDomain },
|
||||||
|
{ DnsResponseCode.NotImplemented, DnsResponseCodeText.NotImp },
|
||||||
|
{ DnsResponseCode.Refused, DnsResponseCodeText.Refused },
|
||||||
|
{ DnsResponseCode.ExistingDomain, DnsResponseCodeText.YXDomain },
|
||||||
|
{ DnsResponseCode.ExistingResourceRecordSet, DnsResponseCodeText.YXRRSet },
|
||||||
|
{ DnsResponseCode.MissingResourceRecordSet, DnsResponseCodeText.NXRRSet },
|
||||||
|
{ DnsResponseCode.NotAuthorized, DnsResponseCodeText.NotAuth },
|
||||||
|
{ DnsResponseCode.NotZone, DnsResponseCodeText.NotZone },
|
||||||
|
{ DnsResponseCode.BadVersionOrBadSignature, DnsResponseCodeText.BADVERS },
|
||||||
|
{ DnsResponseCode.BadKey, DnsResponseCodeText.BADKEY },
|
||||||
|
{ DnsResponseCode.BadTime, DnsResponseCodeText.BADTIME },
|
||||||
|
{ DnsResponseCode.BadMode, DnsResponseCodeText.BADMODE },
|
||||||
|
{ DnsResponseCode.BadName, DnsResponseCodeText.BADNAME },
|
||||||
|
{ DnsResponseCode.BadAlgorithm, DnsResponseCodeText.BADALG },
|
||||||
|
{ DnsResponseCode.BadTruncation, DnsResponseCodeText.BADTRUNC },
|
||||||
|
{ DnsResponseCode.BadCookie, DnsResponseCodeText.BADCOOKIE },
|
||||||
|
};
|
||||||
|
|
||||||
|
public static string GetErrorText(DnsResponseCode code)
|
||||||
|
{
|
||||||
|
if (!errors.ContainsKey(code))
|
||||||
|
{
|
||||||
|
return Unassigned;
|
||||||
|
}
|
||||||
|
|
||||||
|
return errors[code];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public class DnsResponseException : Exception
|
||||||
|
{
|
||||||
|
public DnsResponseCode Code { get; }
|
||||||
|
|
||||||
|
public string DnsError { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with <see cref="DnsResponseCode.Unassigned"/>.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException() : base(DnsResponseCodeText.Unassigned)
|
||||||
|
{
|
||||||
|
Code = DnsResponseCode.Unassigned;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with <see cref="DnsResponseCode.Unassigned"/>
|
||||||
|
/// and a custom message.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException(string message) : base(message)
|
||||||
|
{
|
||||||
|
Code = DnsResponseCode.Unassigned;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with
|
||||||
|
/// the standard error text for this <paramref name="code"/>.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException(DnsResponseCode code) : base(DnsResponseCodeText.GetErrorText(code))
|
||||||
|
{
|
||||||
|
Code = code;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with <see cref="DnsResponseCode.Unassigned"/>
|
||||||
|
/// and a custom message.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException(string message, Exception innerException) : base(message, innerException)
|
||||||
|
{
|
||||||
|
Code = DnsResponseCode.Unassigned;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with a custom message
|
||||||
|
/// and the given <paramref name="code"/>.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException(DnsResponseCode code, string message) : base(message)
|
||||||
|
{
|
||||||
|
Code = code;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates an instance of <see cref="DnsResponseException"/> with a custom message
|
||||||
|
/// and the given <paramref name="code"/>.
|
||||||
|
/// </summary>
|
||||||
|
public DnsResponseException(DnsResponseCode code, string message, Exception innerException) : base(message, innerException)
|
||||||
|
{
|
||||||
|
Code = code;
|
||||||
|
DnsError = DnsResponseCodeText.GetErrorText(Code);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
57
MailServer/MailServer/DNS/DnsResponseHeader.cs
Normal file
57
MailServer/MailServer/DNS/DnsResponseHeader.cs
Normal file
@ -0,0 +1,57 @@
|
|||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class DnsResponseHeader
|
||||||
|
{
|
||||||
|
private readonly ushort _flags = 0;
|
||||||
|
|
||||||
|
public int AdditionalCount { get; }
|
||||||
|
|
||||||
|
public int AnswerCount { get; }
|
||||||
|
|
||||||
|
public bool FutureUse => HasFlag(DnsHeaderFlag.FutureUse);
|
||||||
|
|
||||||
|
public bool HasAuthorityAnswer => HasFlag(DnsHeaderFlag.HasAuthorityAnswer);
|
||||||
|
|
||||||
|
public DnsHeaderFlag HeaderFlags => (DnsHeaderFlag)_flags;
|
||||||
|
|
||||||
|
public int Id { get; }
|
||||||
|
|
||||||
|
public bool IsAuthenticData => HasFlag(DnsHeaderFlag.IsAuthenticData);
|
||||||
|
|
||||||
|
public bool IsCheckingDisabled => HasFlag(DnsHeaderFlag.IsCheckingDisabled);
|
||||||
|
|
||||||
|
public bool HasQuery => HasFlag(DnsHeaderFlag.HasQuery);
|
||||||
|
|
||||||
|
public int NameServerCount { get; }
|
||||||
|
|
||||||
|
public DnsOpCode OPCode => (DnsOpCode)((DnsHeader.OPCODE_MASK & _flags) >> DnsHeader.OPCODE_SHIFT);
|
||||||
|
|
||||||
|
public int QuestionCount { get; }
|
||||||
|
|
||||||
|
public bool RecursionAvailable => HasFlag(DnsHeaderFlag.RecursionAvailable);
|
||||||
|
|
||||||
|
public DnsResponseCode ResponseCode => (DnsResponseCode)(_flags & DnsHeader.RCODE_MASK);
|
||||||
|
|
||||||
|
////ResponseCode {set
|
||||||
|
////{
|
||||||
|
//// _flags &= (ushort)~(DnsHeader.RCODE_MASK);
|
||||||
|
//// _flags |= (ushort)((ushort)value & DnsHeader.RCODE_MASK);
|
||||||
|
////}}
|
||||||
|
|
||||||
|
public bool ResultTruncated => HasFlag(DnsHeaderFlag.ResultTruncated);
|
||||||
|
|
||||||
|
public bool RecursionDesired => HasFlag(DnsHeaderFlag.RecursionDesired);
|
||||||
|
|
||||||
|
public DnsResponseHeader(int id, ushort flags, int questionCount, int answerCount, int additionalCount, int serverCount)
|
||||||
|
{
|
||||||
|
Id = id;
|
||||||
|
_flags = flags;
|
||||||
|
QuestionCount = questionCount;
|
||||||
|
AnswerCount = answerCount;
|
||||||
|
AdditionalCount = additionalCount;
|
||||||
|
NameServerCount = serverCount;
|
||||||
|
}
|
||||||
|
|
||||||
|
private bool HasFlag(DnsHeaderFlag flag) => (HeaderFlags & flag) != 0;
|
||||||
|
}
|
||||||
|
}
|
64
MailServer/MailServer/DNS/DnsUdpMessageHandler.cs
Normal file
64
MailServer/MailServer/DNS/DnsUdpMessageHandler.cs
Normal file
@ -0,0 +1,64 @@
|
|||||||
|
using System;
|
||||||
|
using System.Diagnostics;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Net;
|
||||||
|
using System.Net.Sockets;
|
||||||
|
using System.Threading;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
using DnsClient.Protocol;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class DnsUdpMessageHandler : DnsMessageHandler, IDisposable
|
||||||
|
{
|
||||||
|
private readonly UdpClient _client = new UdpClient();
|
||||||
|
private bool _disposedValue = false;
|
||||||
|
|
||||||
|
public override bool IsTransientException<T>(T exception)
|
||||||
|
{
|
||||||
|
Debug.WriteLine("Check transient {0}.", exception);
|
||||||
|
if (exception is SocketException) return true;
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override async Task<DnsResponseMessage> QueryAsync(
|
||||||
|
IPEndPoint server,
|
||||||
|
DnsRequestMessage request,
|
||||||
|
CancellationToken cancellationToken)
|
||||||
|
{
|
||||||
|
var sw = Stopwatch.StartNew();
|
||||||
|
|
||||||
|
//using (var udpClient = new UdpClient())
|
||||||
|
//{
|
||||||
|
var data = GetRequestData(request);
|
||||||
|
await _client.SendAsync(data, data.Length, server);
|
||||||
|
|
||||||
|
var result = await _client.ReceiveAsync();
|
||||||
|
|
||||||
|
var response = GetResponseMessage(result.Buffer);
|
||||||
|
|
||||||
|
if (request.Header.Id != response.Header.Id)
|
||||||
|
{
|
||||||
|
throw new DnsResponseException("Header id missmatch.");
|
||||||
|
}
|
||||||
|
|
||||||
|
return response;
|
||||||
|
//}
|
||||||
|
}
|
||||||
|
|
||||||
|
protected override void Dispose(bool disposing)
|
||||||
|
{
|
||||||
|
if (!_disposedValue)
|
||||||
|
{
|
||||||
|
if (disposing)
|
||||||
|
{
|
||||||
|
_client.Dispose();
|
||||||
|
}
|
||||||
|
|
||||||
|
_disposedValue = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
base.Dispose(disposing);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
368
MailServer/MailServer/DNS/LookupClient.cs
Normal file
368
MailServer/MailServer/DNS/LookupClient.cs
Normal file
@ -0,0 +1,368 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Diagnostics;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Net;
|
||||||
|
using System.Net.Sockets;
|
||||||
|
using System.Text;
|
||||||
|
using System.Threading;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
using DnsClient.Protocol;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class LookupClient : IDisposable
|
||||||
|
{
|
||||||
|
private static readonly TimeSpan s_defaultTimeout = TimeSpan.FromSeconds(5);
|
||||||
|
private static readonly TimeSpan s_infiniteTimeout = System.Threading.Timeout.InfiniteTimeSpan;
|
||||||
|
private static readonly TimeSpan s_maxTimeout = TimeSpan.FromMilliseconds(int.MaxValue);
|
||||||
|
private static ushort _uniqueId = 0;
|
||||||
|
private readonly ResponseCache _cache = new ResponseCache(true);
|
||||||
|
private readonly object _endpointLock = new object();
|
||||||
|
private readonly DnsMessageHandler _messageHandler;
|
||||||
|
private Queue<EndPointInfo> _endpoints;
|
||||||
|
private TimeSpan _timeout = s_defaultTimeout;
|
||||||
|
private bool _disposedValue = false;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets the list of configured name servers.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<IPEndPoint> NameServers { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or set a flag indicating if recursion should be enabled for DNS queries.
|
||||||
|
/// </summary>
|
||||||
|
public bool Recursion { get; set; } = true;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or sets number of tries to connect to one name server before trying the next one or throwing an exception.
|
||||||
|
/// </summary>
|
||||||
|
public int Retries { get; set; } = 5;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or sets a flag indicating if the <see cref="LookupClient"/> should throw an <see cref="DnsResponseException"/>
|
||||||
|
/// if the returned result contains an error flag other than <see cref="DnsResponseCode.NoError"/>.
|
||||||
|
/// (The default behavior is <c>False</c>).
|
||||||
|
/// </summary>
|
||||||
|
public bool ThrowDnsErrors { get; set; } = false;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or sets timeout in milliseconds.
|
||||||
|
/// Timeout must be greater than zero and less than <see cref="int.MaxValue"/>.
|
||||||
|
/// </summary>
|
||||||
|
public TimeSpan Timeout
|
||||||
|
{
|
||||||
|
get { return _timeout; }
|
||||||
|
set
|
||||||
|
{
|
||||||
|
if ((value <= TimeSpan.Zero || value > s_maxTimeout) && value != s_infiniteTimeout)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(value));
|
||||||
|
}
|
||||||
|
|
||||||
|
_timeout = value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or sets a flag indicating if the <see cref="LookupClient"/> should use caching or not.
|
||||||
|
/// The TTL of cached results is defined by each resource record individually.
|
||||||
|
/// </summary>
|
||||||
|
public bool UseCache
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return _cache.Enabled;
|
||||||
|
}
|
||||||
|
set
|
||||||
|
{
|
||||||
|
_cache.Enabled = value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets or sets a <see cref="TimeSpan"/> which can override the TTL of a resource record in case the
|
||||||
|
/// TTL of the record is lower than this minimum value.
|
||||||
|
/// This is useful in cases where the server retruns a zero TTL and the record should be cached for a
|
||||||
|
/// very short duration anyways.
|
||||||
|
///
|
||||||
|
/// This setting gets igonred in case <see cref="UseCache"/> is set to <c>False</c>.
|
||||||
|
/// </summary>
|
||||||
|
public TimeSpan? MimimumCacheTimeout
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return _cache.MinimumTimout;
|
||||||
|
}
|
||||||
|
set
|
||||||
|
{
|
||||||
|
_cache.MinimumTimout = value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public LookupClient()
|
||||||
|
: this(NameServer.ResolveNameServers().ToArray())
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public LookupClient(params IPEndPoint[] nameServers)
|
||||||
|
: this(new DnsUdpMessageHandler(), nameServers)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public LookupClient(params IPAddress[] nameServers)
|
||||||
|
: this(
|
||||||
|
new DnsUdpMessageHandler(),
|
||||||
|
nameServers.Select(p => new IPEndPoint(p, NameServer.DefaultPort)).ToArray())
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public LookupClient(DnsMessageHandler messageHandler, ICollection<IPEndPoint> nameServers)
|
||||||
|
{
|
||||||
|
if (messageHandler == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(messageHandler));
|
||||||
|
}
|
||||||
|
if (nameServers == null || nameServers.Count == 0)
|
||||||
|
{
|
||||||
|
throw new ArgumentException("At least one name server must be configured.", nameof(nameServers));
|
||||||
|
}
|
||||||
|
|
||||||
|
NameServers = nameServers.ToArray();
|
||||||
|
_endpoints = new Queue<EndPointInfo>();
|
||||||
|
foreach (var server in NameServers)
|
||||||
|
{
|
||||||
|
_endpoints.Enqueue(new EndPointInfo(server));
|
||||||
|
}
|
||||||
|
_messageHandler = messageHandler;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Translates the IPV4 or IPV6 address into an arpa address.
|
||||||
|
/// </summary>
|
||||||
|
/// <param name="ip">IP address to get the arpa address form</param>
|
||||||
|
/// <returns>The mirrored IPV4 or IPV6 arpa address</returns>
|
||||||
|
public static string GetArpaName(IPAddress ip)
|
||||||
|
{
|
||||||
|
var bytes = ip.GetAddressBytes();
|
||||||
|
Array.Reverse(bytes);
|
||||||
|
|
||||||
|
// check IP6
|
||||||
|
if (ip.AddressFamily == AddressFamily.InterNetworkV6)
|
||||||
|
{
|
||||||
|
// reveresed bytes need to be split into 4 bit parts and separated by '.'
|
||||||
|
var newBytes = bytes
|
||||||
|
.SelectMany(b => new[] { (b >> 0) & 0xf, (b >> 4) & 0xf })
|
||||||
|
.Aggregate(new StringBuilder(), (s, b) => s.Append(b.ToString("x")).Append(".")) + "ip6.arpa.";
|
||||||
|
|
||||||
|
return newBytes;
|
||||||
|
}
|
||||||
|
else if (ip.AddressFamily == AddressFamily.InterNetwork)
|
||||||
|
{
|
||||||
|
// else IP4
|
||||||
|
return string.Join(".", bytes) + ".in-addr.arpa.";
|
||||||
|
}
|
||||||
|
|
||||||
|
throw new InvalidOperationException("Not a valid IP4 or IP6 address.");
|
||||||
|
}
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryAsync(string query, QueryType queryType)
|
||||||
|
=> QueryAsync(query, queryType, CancellationToken.None);
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryAsync(string query, QueryType queryType, CancellationToken cancellationToken)
|
||||||
|
=> QueryAsync(query, queryType, QueryClass.IN, cancellationToken);
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryAsync(string query, QueryType queryType, QueryClass queryClass)
|
||||||
|
=> QueryAsync(query, queryType, queryClass, CancellationToken.None);
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryAsync(string query, QueryType queryType, QueryClass queryClass, CancellationToken cancellationToken)
|
||||||
|
=> QueryAsync(new DnsQuestion(query, queryType, queryClass), cancellationToken);
|
||||||
|
|
||||||
|
////public Task<DnsQueryResponse> QueryAsync(params DnsQuestion[] questions)
|
||||||
|
//// => QueryAsync(CancellationToken.None, questions);
|
||||||
|
|
||||||
|
private async Task<DnsQueryResponse> QueryAsync(DnsQuestion question, CancellationToken cancellationToken)
|
||||||
|
{
|
||||||
|
if (question == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(question));
|
||||||
|
}
|
||||||
|
|
||||||
|
var head = new DnsRequestHeader(GetNextUniqueId(), 1, Recursion, DnsOpCode.Query);
|
||||||
|
var request = new DnsRequestMessage(head, question);
|
||||||
|
var cacheKey = ResponseCache.GetCacheKey(question);
|
||||||
|
var result = await _cache.GetOrAdd(cacheKey, async () => await ResolveQueryAsync(request, cancellationToken));
|
||||||
|
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryReverseAsync(IPAddress ipAddress)
|
||||||
|
=> QueryReverseAsync(ipAddress, CancellationToken.None);
|
||||||
|
|
||||||
|
public Task<DnsQueryResponse> QueryReverseAsync(IPAddress ipAddress, CancellationToken cancellationToken)
|
||||||
|
{
|
||||||
|
if (ipAddress == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(ipAddress));
|
||||||
|
}
|
||||||
|
|
||||||
|
var arpa = GetArpaName(ipAddress);
|
||||||
|
return QueryAsync(arpa, QueryType.PTR, QueryClass.IN, cancellationToken);
|
||||||
|
}
|
||||||
|
|
||||||
|
private static ushort GetNextUniqueId()
|
||||||
|
{
|
||||||
|
if (_uniqueId == ushort.MaxValue || _uniqueId == 0)
|
||||||
|
{
|
||||||
|
_uniqueId = (ushort)(new Random()).Next(ushort.MaxValue / 2);
|
||||||
|
}
|
||||||
|
|
||||||
|
return _uniqueId++;
|
||||||
|
}
|
||||||
|
|
||||||
|
// TODO: TCP fallback on truncates
|
||||||
|
// TODO: most popular DNS servers do not support mulitple queries in one packet, therefore, split it into multiple requests?
|
||||||
|
//private async Task<DnsQueryResponse> QueryAsync(DnsRequestMessage request, CancellationToken cancellationToken)
|
||||||
|
//{
|
||||||
|
|
||||||
|
//}
|
||||||
|
|
||||||
|
private async Task<DnsQueryResponse> ResolveQueryAsync(DnsRequestMessage request, CancellationToken cancellationToken)
|
||||||
|
{
|
||||||
|
if (request == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(request));
|
||||||
|
}
|
||||||
|
|
||||||
|
for (int index = 0; index < NameServers.Count; index++)
|
||||||
|
{
|
||||||
|
EndPointInfo serverInfo = null;
|
||||||
|
lock (_endpointLock)
|
||||||
|
{
|
||||||
|
while (_endpoints.Count > 0 && serverInfo == null)
|
||||||
|
{
|
||||||
|
serverInfo = _endpoints.Dequeue();
|
||||||
|
|
||||||
|
if (serverInfo.IsDisabled)
|
||||||
|
{
|
||||||
|
serverInfo = null;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
// put it back and then use it..
|
||||||
|
_endpoints.Enqueue(serverInfo);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (serverInfo == null)
|
||||||
|
{
|
||||||
|
// let's be optimistic and eable them again, maybe they wher offline one for a while
|
||||||
|
_endpoints.ToList().ForEach(p => p.IsDisabled = false);
|
||||||
|
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
var tries = 0;
|
||||||
|
do
|
||||||
|
{
|
||||||
|
tries++;
|
||||||
|
try
|
||||||
|
{
|
||||||
|
DnsResponseMessage response;
|
||||||
|
var resultTask = _messageHandler.QueryAsync(serverInfo.Endpoint, request, cancellationToken);
|
||||||
|
if (Timeout != s_infiniteTimeout)
|
||||||
|
{
|
||||||
|
response = await resultTask.TimeoutAfter(Timeout);
|
||||||
|
}
|
||||||
|
|
||||||
|
response = await resultTask;
|
||||||
|
|
||||||
|
var result = response.AsReadonly;
|
||||||
|
|
||||||
|
if (ThrowDnsErrors && result.Header.ResponseCode != DnsResponseCode.NoError)
|
||||||
|
{
|
||||||
|
throw new DnsResponseException(result.Header.ResponseCode);
|
||||||
|
}
|
||||||
|
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
catch (DnsResponseException)
|
||||||
|
{
|
||||||
|
// occurs only if the option to throw dns exceptions is enabled on the lookup client. (see above).
|
||||||
|
// lets not mess with the stack
|
||||||
|
throw;
|
||||||
|
}
|
||||||
|
catch (TimeoutException)
|
||||||
|
{
|
||||||
|
// do nothing... transient if timeoutAfter timed out
|
||||||
|
}
|
||||||
|
catch (SocketException ex) when (ex.SocketErrorCode == SocketError.AddressFamilyNotSupported)
|
||||||
|
{
|
||||||
|
// this socket error might indicate the server endpoint is actually bad and should be ignored in future queries.
|
||||||
|
serverInfo.IsDisabled = true;
|
||||||
|
Debug.WriteLine($"Disabling name server {serverInfo.Endpoint}.");
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
catch (Exception ex) when (_messageHandler.IsTransientException(ex))
|
||||||
|
{
|
||||||
|
}
|
||||||
|
catch (Exception ex)
|
||||||
|
{
|
||||||
|
var agg = ex as AggregateException;
|
||||||
|
if (agg != null)
|
||||||
|
{
|
||||||
|
agg.Handle(e =>
|
||||||
|
{
|
||||||
|
if (e is TimeoutException) return true;
|
||||||
|
if (_messageHandler.IsTransientException(e)) return true;
|
||||||
|
return false;
|
||||||
|
});
|
||||||
|
|
||||||
|
throw new DnsResponseException("Unhandled exception", agg.InnerException);
|
||||||
|
}
|
||||||
|
|
||||||
|
throw new DnsResponseException("Unhandled exception", ex);
|
||||||
|
}
|
||||||
|
finally
|
||||||
|
{
|
||||||
|
// do cleanup stuff or logging?
|
||||||
|
}
|
||||||
|
} while (tries <= Retries && !cancellationToken.IsCancellationRequested);
|
||||||
|
}
|
||||||
|
|
||||||
|
throw new DnsResponseException($"No connection could be established to any of the following name servers: {string.Join(", ", NameServers)}.");
|
||||||
|
}
|
||||||
|
|
||||||
|
private class EndPointInfo
|
||||||
|
{
|
||||||
|
public IPEndPoint Endpoint { get; }
|
||||||
|
|
||||||
|
public bool IsDisabled { get; set; }
|
||||||
|
|
||||||
|
public EndPointInfo(IPEndPoint endpoint)
|
||||||
|
{
|
||||||
|
Endpoint = endpoint;
|
||||||
|
IsDisabled = false;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
protected virtual void Dispose(bool disposing)
|
||||||
|
{
|
||||||
|
if (!_disposedValue)
|
||||||
|
{
|
||||||
|
if (disposing)
|
||||||
|
{
|
||||||
|
_messageHandler.Dispose();
|
||||||
|
}
|
||||||
|
|
||||||
|
_disposedValue = true;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public void Dispose()
|
||||||
|
{
|
||||||
|
Dispose(true);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
44
MailServer/MailServer/DNS/NameServer.cs
Normal file
44
MailServer/MailServer/DNS/NameServer.cs
Normal file
@ -0,0 +1,44 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Net;
|
||||||
|
using System.Net.NetworkInformation;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public class NameServer
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// The default DNS server port.
|
||||||
|
/// </summary>
|
||||||
|
public const int DefaultPort = 53;
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a list of name servers by iterating over the available network interfaces.
|
||||||
|
/// </summary>
|
||||||
|
/// <returns>The list of name servers.</returns>
|
||||||
|
public static ICollection<IPEndPoint> ResolveNameServers()
|
||||||
|
{
|
||||||
|
var result = new HashSet<IPEndPoint>();
|
||||||
|
|
||||||
|
var adapters = NetworkInterface.GetAllNetworkInterfaces();
|
||||||
|
foreach (NetworkInterface networkInterface in
|
||||||
|
adapters
|
||||||
|
.Where(p => p.OperationalStatus == OperationalStatus.Up
|
||||||
|
&& p.NetworkInterfaceType != NetworkInterfaceType.Loopback))
|
||||||
|
{
|
||||||
|
foreach (IPAddress dnsAddress in networkInterface
|
||||||
|
.GetIPProperties()
|
||||||
|
.DnsAddresses
|
||||||
|
.Where(i =>
|
||||||
|
i.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork
|
||||||
|
|| i.AddressFamily == System.Net.Sockets.AddressFamily.InterNetworkV6))
|
||||||
|
{
|
||||||
|
result.Add(new IPEndPoint(dnsAddress, DefaultPort));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return result.ToArray();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
135
MailServer/MailServer/DNS/Protocol/DnsDatagramReader.cs
Normal file
135
MailServer/MailServer/DNS/Protocol/DnsDatagramReader.cs
Normal file
@ -0,0 +1,135 @@
|
|||||||
|
using System;
|
||||||
|
using System.Net;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
public class DnsDatagramReader
|
||||||
|
{
|
||||||
|
private readonly byte[] _data;
|
||||||
|
private int _index;
|
||||||
|
|
||||||
|
public int Index
|
||||||
|
{
|
||||||
|
get
|
||||||
|
{
|
||||||
|
return _index;
|
||||||
|
}
|
||||||
|
set
|
||||||
|
{
|
||||||
|
if (value < 0 || value > _data.Length)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(value));
|
||||||
|
}
|
||||||
|
|
||||||
|
_index = value;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsDatagramReader(byte[] data, int startIndex = 0)
|
||||||
|
{
|
||||||
|
_data = data;
|
||||||
|
Index = startIndex;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
https://tools.ietf.org/html/rfc1035#section-3.3:
|
||||||
|
<character-string> is a single
|
||||||
|
length octet followed by that number of characters. <character-string>
|
||||||
|
is treated as binary information, and can be up to 256 characters in
|
||||||
|
length (including the length octet).
|
||||||
|
* */
|
||||||
|
/// <summary>
|
||||||
|
/// Reads the single length octet and the following characters as ASCII text.
|
||||||
|
/// </summary>
|
||||||
|
/// <returns></returns>
|
||||||
|
public string ReadString()
|
||||||
|
{
|
||||||
|
var length = ReadByte();
|
||||||
|
|
||||||
|
var result = Encoding.ASCII.GetString(_data, _index, length);
|
||||||
|
_index += length;
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte ReadByte()
|
||||||
|
{
|
||||||
|
if (_index >= _data.Length)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException("Cannot read byte.");
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
return _data[_index++];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] ReadBytes(int length)
|
||||||
|
{
|
||||||
|
if (_data.Length < _index + length)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException($"Cannot read that many bytes: '{length}'.");
|
||||||
|
}
|
||||||
|
|
||||||
|
var result = new byte[length];
|
||||||
|
Array.Copy(_data, _index, result, 0, length);
|
||||||
|
_index += length;
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Reads an IP address from the next 4 bytes.
|
||||||
|
/// </summary>
|
||||||
|
/// <returns>The <see cref="IPAddress"/>.</returns>
|
||||||
|
/// <exception cref="IndexOutOfRangeException">If there are no 4 bytes to read.</exception>
|
||||||
|
public IPAddress ReadIPAddress()
|
||||||
|
{
|
||||||
|
if (_data.Length < _index + 4)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException("IPAddress expected exactly 4 bytes.");
|
||||||
|
}
|
||||||
|
|
||||||
|
return new IPAddress(ReadBytes(4));
|
||||||
|
}
|
||||||
|
|
||||||
|
public IPAddress ReadIPv6Address()
|
||||||
|
{
|
||||||
|
var address = new IPAddress(ReadBytes(8 * 2));
|
||||||
|
|
||||||
|
return address;
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsName ReadName()
|
||||||
|
{
|
||||||
|
return DnsName.FromBytes(_data, ref _index);
|
||||||
|
}
|
||||||
|
|
||||||
|
public ushort ReadUInt16()
|
||||||
|
{
|
||||||
|
if (_data.Length < Index + 2)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException("Cannot read more data.");
|
||||||
|
}
|
||||||
|
|
||||||
|
var result = BitConverter.ToUInt16(_data, _index);
|
||||||
|
_index += 2;
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
public ushort ReadUInt16Reverse()
|
||||||
|
{
|
||||||
|
if (_data.Length < Index + 2)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException("Cannot read more data.");
|
||||||
|
}
|
||||||
|
|
||||||
|
byte a = _data[_index++], b = _data[_index++];
|
||||||
|
return (ushort)(a << 8 | b);
|
||||||
|
}
|
||||||
|
|
||||||
|
public uint ReadUInt32Reverse()
|
||||||
|
{
|
||||||
|
return (uint)(ReadUInt16Reverse() << 16 | ReadUInt16Reverse());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
113
MailServer/MailServer/DNS/Protocol/DnsDatagramWriter.cs
Normal file
113
MailServer/MailServer/DNS/Protocol/DnsDatagramWriter.cs
Normal file
@ -0,0 +1,113 @@
|
|||||||
|
using System;
|
||||||
|
using System.Net;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
public class DnsDatagramWriter
|
||||||
|
{
|
||||||
|
private byte[] _buffer;
|
||||||
|
|
||||||
|
public byte[] Data => _buffer;
|
||||||
|
|
||||||
|
public int Index { get; set; }
|
||||||
|
|
||||||
|
public DnsDatagramWriter(int length)
|
||||||
|
{
|
||||||
|
_buffer = new byte[length];
|
||||||
|
}
|
||||||
|
|
||||||
|
private DnsDatagramWriter(byte[] data, int newLength)
|
||||||
|
{
|
||||||
|
if (data.Length > newLength)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(newLength));
|
||||||
|
}
|
||||||
|
|
||||||
|
_buffer = new byte[newLength];
|
||||||
|
Array.Copy(data, _buffer, data.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Creates a new writer instance with a new length.
|
||||||
|
/// </summary>
|
||||||
|
/// <param name="byLength">The amount of bytes the current buffer should be extended by.</param>
|
||||||
|
/// <returns>A new writer.</returns>
|
||||||
|
public void Extend(int byLength)
|
||||||
|
{
|
||||||
|
if (byLength <= 0)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(byLength));
|
||||||
|
}
|
||||||
|
|
||||||
|
var fullLength = byLength + _buffer.Length;
|
||||||
|
var newBuffer = new byte[fullLength];
|
||||||
|
Array.Copy(_buffer, 0, newBuffer, 0, _buffer.Length);
|
||||||
|
//return new DnsDatagramWriter(newBuffer, fullLength) { Offset = Offset };
|
||||||
|
_buffer = newBuffer;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void SetBytes(byte[] data, int length) => SetBytes(data, 0, Index, length);
|
||||||
|
|
||||||
|
public void SetInt(int value) => SetInt(value, Index);
|
||||||
|
|
||||||
|
public void SetInt16(short value) => SetInt16(value, Index);
|
||||||
|
|
||||||
|
public void SetInt16Network(short value) => SetInt16Network(value, Index);
|
||||||
|
|
||||||
|
public void SetUInt32Network(uint value)
|
||||||
|
{
|
||||||
|
var bytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((int)value));
|
||||||
|
SetBytes(bytes, Index, bytes.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void SetIntNetwork(int value) => SetIntNetwork(value, Index);
|
||||||
|
|
||||||
|
public void SetUInt16(ushort value) => SetInt16((short)value, Index);
|
||||||
|
|
||||||
|
public void SetUInt16Network(ushort value) => SetInt16Network((short)value, Index);
|
||||||
|
|
||||||
|
private void SetBytes(byte[] data, int destOffset, int length)
|
||||||
|
{
|
||||||
|
SetBytes(data, 0, destOffset, length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void SetBytes(byte[] data, int dataOffset, int destOffset, int length)
|
||||||
|
{
|
||||||
|
if (length + dataOffset > data.Length || length + dataOffset > _buffer.Length)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(length));
|
||||||
|
}
|
||||||
|
if (destOffset + dataOffset + length > _buffer.Length)
|
||||||
|
{
|
||||||
|
throw new ArgumentOutOfRangeException(nameof(destOffset));
|
||||||
|
}
|
||||||
|
|
||||||
|
Array.ConstrainedCopy(data, dataOffset, _buffer, destOffset, length);
|
||||||
|
Index = destOffset + length;
|
||||||
|
}
|
||||||
|
|
||||||
|
private void SetInt(int value, int offset)
|
||||||
|
{
|
||||||
|
var bytes = BitConverter.GetBytes(value);
|
||||||
|
SetBytes(bytes, offset, bytes.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void SetInt16(short value, int offset)
|
||||||
|
{
|
||||||
|
var bytes = BitConverter.GetBytes(value);
|
||||||
|
SetBytes(bytes, offset, bytes.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void SetInt16Network(short value, int offset)
|
||||||
|
{
|
||||||
|
var bytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(value));
|
||||||
|
SetBytes(bytes, offset, bytes.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void SetIntNetwork(int value, int offset)
|
||||||
|
{
|
||||||
|
var bytes = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(value));
|
||||||
|
SetBytes(bytes, offset, bytes.Length);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
195
MailServer/MailServer/DNS/Protocol/DnsRecordFactory.cs
Normal file
195
MailServer/MailServer/DNS/Protocol/DnsRecordFactory.cs
Normal file
@ -0,0 +1,195 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using DnsClient.Protocol.Record;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
public class DnsRecordFactory
|
||||||
|
{
|
||||||
|
public static IDictionary<ResourceRecordType, Func<DnsDatagramReader, ResourceRecordInfo, DnsResourceRecord>> s_recordFactory =
|
||||||
|
new Dictionary<ResourceRecordType, Func<DnsDatagramReader, ResourceRecordInfo, DnsResourceRecord>>();
|
||||||
|
|
||||||
|
private readonly DnsDatagramReader _reader;
|
||||||
|
|
||||||
|
public DnsRecordFactory(DnsDatagramReader reader)
|
||||||
|
{
|
||||||
|
if (reader == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(reader));
|
||||||
|
}
|
||||||
|
|
||||||
|
_reader = reader;
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| |
|
||||||
|
/ /
|
||||||
|
/ NAME /
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| TYPE |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| CLASS |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| TTL |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| RDLENGTH |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
|
||||||
|
/ RDATA /
|
||||||
|
/ /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
* */
|
||||||
|
public ResourceRecordInfo ReadRecordInfo()
|
||||||
|
{
|
||||||
|
return new ResourceRecordInfo(
|
||||||
|
_reader.ReadName().ToString(), // name
|
||||||
|
(ResourceRecordType)_reader.ReadUInt16Reverse(),// type
|
||||||
|
(QueryClass)_reader.ReadUInt16Reverse(), // class
|
||||||
|
_reader.ReadUInt32Reverse(), // ttl - 32bit!!
|
||||||
|
_reader.ReadUInt16Reverse()); // RDLength
|
||||||
|
//reader.ReadBytes(reader.ReadUInt16Reverse())); // rdata
|
||||||
|
}
|
||||||
|
|
||||||
|
public DnsResourceRecord GetRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
if (info == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(info));
|
||||||
|
}
|
||||||
|
|
||||||
|
var oldIndex = _reader.Index;
|
||||||
|
DnsResourceRecord result;
|
||||||
|
|
||||||
|
if (s_recordFactory.ContainsKey(info.RecordType))
|
||||||
|
{
|
||||||
|
result = s_recordFactory[info.RecordType](_reader, info);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
switch (info.RecordType)
|
||||||
|
{
|
||||||
|
case ResourceRecordType.A:
|
||||||
|
result = ResolveARecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.NS:
|
||||||
|
result = ResolveNsRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.SOA:
|
||||||
|
result = ResolveSoaRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.PTR:
|
||||||
|
result = ResolvePtrRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.MX:
|
||||||
|
result = ResolveMXRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.TXT:
|
||||||
|
result = ResolveTXTRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.AAAA:
|
||||||
|
result = ResolveAAAARecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
case ResourceRecordType.SRV:
|
||||||
|
result = ResolveSrvRecord(info);
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
// update reader index because we don't read full data for the empty record
|
||||||
|
_reader.Index += info.RawDataLength;
|
||||||
|
result = new EmptyRecord(info);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// sanity check
|
||||||
|
if (_reader.Index != oldIndex + info.RawDataLength)
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Record reader index out of sync.");
|
||||||
|
}
|
||||||
|
|
||||||
|
return result;
|
||||||
|
}
|
||||||
|
|
||||||
|
private PtrRecord ResolvePtrRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
return new PtrRecord(info, _reader.ReadName().ToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
private AAAARecord ResolveAAAARecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
var address = _reader.ReadIPv6Address();
|
||||||
|
return new AAAARecord(info, address);
|
||||||
|
}
|
||||||
|
|
||||||
|
// default resolver implementation for an A Record
|
||||||
|
private ARecord ResolveARecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
if (info.RawDataLength != 4)
|
||||||
|
{
|
||||||
|
throw new IndexOutOfRangeException($"Reading wrong length for an IP address. Expected 4 found {info.RawDataLength}.");
|
||||||
|
}
|
||||||
|
|
||||||
|
return new ARecord(info, _reader.ReadIPAddress());
|
||||||
|
}
|
||||||
|
|
||||||
|
private MxRecord ResolveMXRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
var preference = _reader.ReadUInt16Reverse();
|
||||||
|
var domain = _reader.ReadName();
|
||||||
|
|
||||||
|
return new MxRecord(info, preference, domain.ToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
private NsRecord ResolveNsRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
var name = _reader.ReadName();
|
||||||
|
return new NsRecord(info, name.ToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
private SoaRecord ResolveSoaRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
var mName = _reader.ReadName();
|
||||||
|
var rName = _reader.ReadName();
|
||||||
|
var serial = _reader.ReadUInt32Reverse();
|
||||||
|
var refresh = _reader.ReadUInt32Reverse();
|
||||||
|
var retry = _reader.ReadUInt32Reverse();
|
||||||
|
var expire = _reader.ReadUInt32Reverse();
|
||||||
|
var minimum = _reader.ReadUInt32Reverse();
|
||||||
|
|
||||||
|
return new SoaRecord(info, mName.ToString(), rName.ToString(), serial, refresh, retry, expire, minimum);
|
||||||
|
}
|
||||||
|
|
||||||
|
private SrvRecord ResolveSrvRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
var priority = _reader.ReadUInt16Reverse();
|
||||||
|
var weight = _reader.ReadUInt16Reverse();
|
||||||
|
var port = _reader.ReadUInt16Reverse();
|
||||||
|
var target = _reader.ReadName();
|
||||||
|
|
||||||
|
return new SrvRecord(info, priority, weight, port, target.ToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
private TxtRecord ResolveTXTRecord(ResourceRecordInfo info)
|
||||||
|
{
|
||||||
|
int pos = _reader.Index;
|
||||||
|
|
||||||
|
var values = new List<string>();
|
||||||
|
while ((_reader.Index - pos) < info.RawDataLength)
|
||||||
|
{
|
||||||
|
values.Add(_reader.ReadString());
|
||||||
|
}
|
||||||
|
|
||||||
|
return new TxtRecord(info, values.ToArray());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
34
MailServer/MailServer/DNS/Protocol/DnsRequestMessage.cs
Normal file
34
MailServer/MailServer/DNS/Protocol/DnsRequestMessage.cs
Normal file
@ -0,0 +1,34 @@
|
|||||||
|
using System;
|
||||||
|
using System.Linq;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// Represents a simple request message which can be send through <see cref="DnsMessageHandler"/>.
|
||||||
|
/// </summary>
|
||||||
|
public class DnsRequestMessage
|
||||||
|
{
|
||||||
|
public DnsRequestHeader Header { get; }
|
||||||
|
|
||||||
|
public DnsQuestion Question { get; }
|
||||||
|
|
||||||
|
public DnsRequestMessage(DnsRequestHeader header, DnsQuestion question)
|
||||||
|
{
|
||||||
|
if (header == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(header));
|
||||||
|
}
|
||||||
|
if (question == null )
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(question));
|
||||||
|
}
|
||||||
|
if (header.QuestionCount != 1)
|
||||||
|
{
|
||||||
|
throw new InvalidOperationException("Header question count and number of questions do not match.");
|
||||||
|
}
|
||||||
|
|
||||||
|
Header = header;
|
||||||
|
Question = question;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
84
MailServer/MailServer/DNS/Protocol/DnsResourceRecord.cs
Normal file
84
MailServer/MailServer/DNS/Protocol/DnsResourceRecord.cs
Normal file
@ -0,0 +1,84 @@
|
|||||||
|
using System;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
public abstract class DnsResourceRecord : ResourceRecordInfo
|
||||||
|
{
|
||||||
|
public DnsResourceRecord(ResourceRecordInfo info)
|
||||||
|
: base(info.QueryName, info.RecordType, info.RecordClass, info.TimeToLive, info.RawDataLength)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <inheritdoc />
|
||||||
|
public override string ToString()
|
||||||
|
{
|
||||||
|
return ToString(0);
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Same as <c>ToString</c> but offsets the <see cref="ResourceRecordInfo.QueryName"/>
|
||||||
|
/// by <paramref name="offset"/>.
|
||||||
|
/// Set the offset to -32 for example to make it print nicely in consols.
|
||||||
|
/// </summary>
|
||||||
|
/// <param name="offset">The offset.</param>
|
||||||
|
/// <returns>A string representing this instance.</returns>
|
||||||
|
public virtual string ToString(int offset = 0)
|
||||||
|
{
|
||||||
|
return string.Format("{0," + offset + "}{1} \t{2} \t{3} \t{4}",
|
||||||
|
QueryName,
|
||||||
|
TimeToLive,
|
||||||
|
RecordClass,
|
||||||
|
RecordType,
|
||||||
|
RecordToString());
|
||||||
|
}
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Returns the actual record's value only and not the full object representation.
|
||||||
|
/// <see cref="ToString(int)"/> uses this to compose the full string value of this instance.
|
||||||
|
/// </summary>
|
||||||
|
/// <returns>A string representing this record.</returns>
|
||||||
|
public abstract string RecordToString();
|
||||||
|
}
|
||||||
|
|
||||||
|
public class ResourceRecordInfo
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// The query name.
|
||||||
|
/// </summary>
|
||||||
|
public string QueryName { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Specifies type of resource record.
|
||||||
|
/// </summary>
|
||||||
|
public ResourceRecordType RecordType { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Specifies type class of resource record, mostly IN but can be CS, CH or HS .
|
||||||
|
/// </summary>
|
||||||
|
public QueryClass RecordClass { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The TTL value for the record set by the server.
|
||||||
|
/// </summary>
|
||||||
|
public uint TimeToLive { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets the number of bytes for this resource record stored in RDATA
|
||||||
|
/// </summary>
|
||||||
|
public int RawDataLength { get; }
|
||||||
|
|
||||||
|
public ResourceRecordInfo(string queryName, ResourceRecordType recordType, QueryClass recordClass, uint ttl, int length)
|
||||||
|
{
|
||||||
|
if (queryName == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(queryName));
|
||||||
|
}
|
||||||
|
|
||||||
|
QueryName = queryName;
|
||||||
|
RecordType = recordType;
|
||||||
|
RecordClass = recordClass;
|
||||||
|
TimeToLive = ttl;
|
||||||
|
RawDataLength = length;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
76
MailServer/MailServer/DNS/Protocol/DnsResponseMessage.cs
Normal file
76
MailServer/MailServer/DNS/Protocol/DnsResponseMessage.cs
Normal file
@ -0,0 +1,76 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// A simple response message which gets returned by the <see cref="LookupClient"/>.
|
||||||
|
/// </summary>
|
||||||
|
public class DnsResponseMessage
|
||||||
|
{
|
||||||
|
private readonly IList<DnsResourceRecord> _additionals = new List<DnsResourceRecord>();
|
||||||
|
private readonly IList<DnsResourceRecord> _answers = new List<DnsResourceRecord>();
|
||||||
|
private readonly IList<DnsResourceRecord> _authorities = new List<DnsResourceRecord>();
|
||||||
|
private readonly DnsResponseHeader _header;
|
||||||
|
private readonly IList<DnsQuestion> _questions = new List<DnsQuestion>();
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Gets the readonly representation of this message which can be returned.
|
||||||
|
/// </summary>
|
||||||
|
public DnsQueryResponse AsReadonly
|
||||||
|
=> new DnsQueryResponse(_header, _questions.ToArray(), _answers.ToArray(), _additionals.ToArray(), _authorities.ToArray());
|
||||||
|
|
||||||
|
public DnsResponseHeader Header => _header;
|
||||||
|
|
||||||
|
public DnsResponseMessage(DnsResponseHeader header)
|
||||||
|
{
|
||||||
|
if (header == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(header));
|
||||||
|
}
|
||||||
|
|
||||||
|
_header = header;
|
||||||
|
}
|
||||||
|
|
||||||
|
public void AddAdditional(DnsResourceRecord record)
|
||||||
|
{
|
||||||
|
if (record == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(record));
|
||||||
|
}
|
||||||
|
|
||||||
|
_additionals.Add(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void AddAnswer(DnsResourceRecord record)
|
||||||
|
{
|
||||||
|
if (record == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(record));
|
||||||
|
}
|
||||||
|
|
||||||
|
_answers.Add(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void AddAuthority(DnsResourceRecord record)
|
||||||
|
{
|
||||||
|
if (record == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(record));
|
||||||
|
}
|
||||||
|
|
||||||
|
_authorities.Add(record);
|
||||||
|
}
|
||||||
|
|
||||||
|
public void AddQuestion(DnsQuestion question)
|
||||||
|
{
|
||||||
|
if (question == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(question));
|
||||||
|
}
|
||||||
|
|
||||||
|
_questions.Add(question);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
45
MailServer/MailServer/DNS/Protocol/Record/ARecord.cs
Normal file
45
MailServer/MailServer/DNS/Protocol/Record/ARecord.cs
Normal file
@ -0,0 +1,45 @@
|
|||||||
|
using System;
|
||||||
|
using System.Net;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
3.4.1. A RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| ADDRESS |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
ADDRESS A 32 bit Internet address.
|
||||||
|
|
||||||
|
Hosts that have multiple Internet addresses will have multiple A
|
||||||
|
records.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A DNS resource record represending an IP address.
|
||||||
|
/// Hosts that have multiple Internet addresses will have multiple A records.
|
||||||
|
/// </summary>
|
||||||
|
public class ARecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public IPAddress Address { get; }
|
||||||
|
|
||||||
|
public ARecord(ResourceRecordInfo info, IPAddress address) : base(info)
|
||||||
|
{
|
||||||
|
if (address == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(address));
|
||||||
|
}
|
||||||
|
|
||||||
|
Address = address;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return Address.ToString();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
35
MailServer/MailServer/DNS/Protocol/Record/AaaaRecord.cs
Normal file
35
MailServer/MailServer/DNS/Protocol/Record/AaaaRecord.cs
Normal file
@ -0,0 +1,35 @@
|
|||||||
|
using System;
|
||||||
|
using System.Net;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/* https://tools.ietf.org/html/rfc3596#section-2.2
|
||||||
|
2.2 AAAA data format
|
||||||
|
|
||||||
|
A 128 bit IPv6 address is encoded in the data portion of an AAAA
|
||||||
|
resource record in network byte order (high-order byte first).
|
||||||
|
*/
|
||||||
|
/// <summary>
|
||||||
|
/// A 128 bit IPv6 address is encoded in the data portion of an AAAA
|
||||||
|
/// resource record in network byte order(high-order byte first).
|
||||||
|
/// </summary>
|
||||||
|
public class AAAARecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public IPAddress Address { get; }
|
||||||
|
|
||||||
|
public AAAARecord(ResourceRecordInfo info, IPAddress address) : base(info)
|
||||||
|
{
|
||||||
|
if (address == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(address));
|
||||||
|
}
|
||||||
|
|
||||||
|
Address = address;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return Address.ToString();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
93
MailServer/MailServer/DNS/Protocol/Record/CaaRecord.cs
Normal file
93
MailServer/MailServer/DNS/Protocol/Record/CaaRecord.cs
Normal file
@ -0,0 +1,93 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/* RFC 6844 (https://tools.ietf.org/html/rfc6844#section-5.1)
|
||||||
|
A CAA RR contains a single property entry consisting of a tag-value
|
||||||
|
pair. Each tag represents a property of the CAA record. The value
|
||||||
|
of a CAA property is that specified in the corresponding value field.
|
||||||
|
|
||||||
|
A domain name MAY have multiple CAA RRs associated with it and a
|
||||||
|
given property MAY be specified more than once.
|
||||||
|
|
||||||
|
The CAA data field contains one property entry. A property entry
|
||||||
|
consists of the following data fields:
|
||||||
|
|
||||||
|
+0-1-2-3-4-5-6-7-|0-1-2-3-4-5-6-7-|
|
||||||
|
| Flags | Tag Length = n |
|
||||||
|
+----------------+----------------+...+---------------+
|
||||||
|
| Tag char 0 | Tag char 1 |...| Tag char n-1 |
|
||||||
|
+----------------+----------------+...+---------------+
|
||||||
|
+----------------+----------------+.....+----------------+
|
||||||
|
| Value byte 0 | Value byte 1 |.....| Value byte m-1 |
|
||||||
|
+----------------+----------------+.....+----------------+
|
||||||
|
|
||||||
|
Where n is the length specified in the Tag length field and m is the
|
||||||
|
remaining octets in the Value field (m = d - n - 2) where d is the
|
||||||
|
length of the RDATA section.
|
||||||
|
|
||||||
|
The data fields are defined as follows:
|
||||||
|
|
||||||
|
Flags: One octet containing the following fields:
|
||||||
|
|
||||||
|
Bit 0, Issuer Critical Flag: If the value is set to '1', the
|
||||||
|
critical flag is asserted and the property MUST be understood
|
||||||
|
if the CAA record is to be correctly processed by a certificate
|
||||||
|
issuer.
|
||||||
|
|
||||||
|
A Certification Authority MUST NOT issue certificates for any
|
||||||
|
Domain that contains a CAA critical property for an unknown or
|
||||||
|
unsupported property tag that for which the issuer critical
|
||||||
|
flag is set.
|
||||||
|
|
||||||
|
Note that according to the conventions set out in [RFC1035], bit 0
|
||||||
|
is the Most Significant Bit and bit 7 is the Least Significant
|
||||||
|
Bit. Thus, the Flags value 1 means that bit 7 is set while a value
|
||||||
|
of 128 means that bit 0 is set according to this convention.
|
||||||
|
|
||||||
|
All other bit positions are reserved for future use.
|
||||||
|
|
||||||
|
To ensure compatibility with future extensions to CAA, DNS records
|
||||||
|
compliant with this version of the CAA specification MUST clear
|
||||||
|
(set to "0") all reserved flags bits. Applications that interpret
|
||||||
|
CAA records MUST ignore the value of all reserved flag bits.
|
||||||
|
|
||||||
|
Tag Length: A single octet containing an unsigned integer specifying
|
||||||
|
the tag length in octets. The tag length MUST be at least 1 and
|
||||||
|
SHOULD be no more than 15.
|
||||||
|
|
||||||
|
Tag: The property identifier, a sequence of US-ASCII characters.
|
||||||
|
|
||||||
|
Tag values MAY contain US-ASCII characters 'a' through 'z', 'A'
|
||||||
|
through 'Z', and the numbers 0 through 9. Tag values SHOULD NOT
|
||||||
|
contain any other characters. Matching of tag values is case
|
||||||
|
insensitive.
|
||||||
|
|
||||||
|
Tag values submitted for registration by IANA MUST NOT contain any
|
||||||
|
characters other than the (lowercase) US-ASCII characters 'a'
|
||||||
|
through 'z' and the numbers 0 through 9.
|
||||||
|
|
||||||
|
Value: A sequence of octets representing the property value.
|
||||||
|
Property values are encoded as binary values and MAY employ sub-
|
||||||
|
formats.
|
||||||
|
|
||||||
|
The length of the value field is specified implicitly as the
|
||||||
|
remaining length of the enclosing Resource Record data field.
|
||||||
|
* */
|
||||||
|
/// <summary>
|
||||||
|
/// Record type 257
|
||||||
|
/// The Certification Authority Authorization (CAA) DNS Resource Record
|
||||||
|
/// allows a DNS domain name holder to specify one or more Certification
|
||||||
|
/// Authorities(CAs) authorized to issue certificates for that domain.
|
||||||
|
/// CAA Resource Records allow a public Certification Authority to
|
||||||
|
/// implement additional controls to reduce the risk of unintended
|
||||||
|
/// certificate mis-issue.This document defines the syntax of the CAA
|
||||||
|
/// record and rules for processing CAA records by certificate issuers.
|
||||||
|
/// </summary>
|
||||||
|
public class CaaRecord
|
||||||
|
{
|
||||||
|
}
|
||||||
|
}
|
14
MailServer/MailServer/DNS/Protocol/Record/EmptyRecord.cs
Normal file
14
MailServer/MailServer/DNS/Protocol/Record/EmptyRecord.cs
Normal file
@ -0,0 +1,14 @@
|
|||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
public class EmptyRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public EmptyRecord(ResourceRecordInfo info) : base(info)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return string.Empty;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
65
MailServer/MailServer/DNS/Protocol/Record/MXRecord.cs
Normal file
65
MailServer/MailServer/DNS/Protocol/Record/MXRecord.cs
Normal file
@ -0,0 +1,65 @@
|
|||||||
|
using System;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
3.3.9. MX RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| PREFERENCE |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ EXCHANGE /
|
||||||
|
/ /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
PREFERENCE A 16 bit integer which specifies the preference given to
|
||||||
|
this RR among others at the same owner. Lower values
|
||||||
|
are preferred.
|
||||||
|
|
||||||
|
EXCHANGE A <domain-name> which specifies a host willing to act as
|
||||||
|
a mail exchange for the owner name.
|
||||||
|
|
||||||
|
MX records cause type A additional section processing for the host
|
||||||
|
specified by EXCHANGE. The use of MX RRs is explained in detail in
|
||||||
|
[RFC-974].
|
||||||
|
*/
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// MX records cause type A additional section processing for the host
|
||||||
|
/// specified by EXCHANGE.The use of MX RRs is explained in detail in
|
||||||
|
/// [RFC-974].
|
||||||
|
/// </summary>
|
||||||
|
public class MxRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// Gets a 16 bit integer which specifies the preference given to
|
||||||
|
/// this RR among others at the same owner.
|
||||||
|
/// Lower values are preferred.
|
||||||
|
/// </summary>
|
||||||
|
public ushort Preference { get; }
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A <domain-name> which specifies a host willing to act as a mail exchange.
|
||||||
|
/// </summary>
|
||||||
|
public string Exchange { get; }
|
||||||
|
|
||||||
|
public MxRecord(ResourceRecordInfo info, ushort preference, string domainName)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
if (string.IsNullOrWhiteSpace(domainName))
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(domainName));
|
||||||
|
}
|
||||||
|
|
||||||
|
Preference = preference;
|
||||||
|
Exchange = domainName;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return string.Format("{0} {1}", Preference, Exchange);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
51
MailServer/MailServer/DNS/Protocol/Record/NsRecord.cs
Normal file
51
MailServer/MailServer/DNS/Protocol/Record/NsRecord.cs
Normal file
@ -0,0 +1,51 @@
|
|||||||
|
using System;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
https://tools.ietf.org/html/rfc1035#section-3.3.11:
|
||||||
|
NS RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ NSDNAME /
|
||||||
|
/ /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
NSDNAME A <domain-name> which specifies a host which should be
|
||||||
|
authoritative for the specified class and domain.
|
||||||
|
|
||||||
|
NS records cause both the usual additional section processing to locate
|
||||||
|
a type A record, and, when used in a referral, a special search of the
|
||||||
|
zone in which they reside for glue information.
|
||||||
|
|
||||||
|
The NS RR states that the named host should be expected to have a zone
|
||||||
|
starting at owner name of the specified class. Note that the class may
|
||||||
|
not indicate the protocol family which should be used to communicate
|
||||||
|
with the host, although it is typically a strong hint. For example,
|
||||||
|
hosts which are name servers for either Internet (IN) or Hesiod (HS)
|
||||||
|
class information are normally queried using IN class protocols.
|
||||||
|
*/
|
||||||
|
|
||||||
|
public class NsRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public string NSDName { get; }
|
||||||
|
|
||||||
|
internal NsRecord(ResourceRecordInfo info, string name)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
if (string.IsNullOrWhiteSpace(name))
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(name));
|
||||||
|
}
|
||||||
|
|
||||||
|
NSDName = name;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return NSDName;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
44
MailServer/MailServer/DNS/Protocol/Record/PtrRecord.cs
Normal file
44
MailServer/MailServer/DNS/Protocol/Record/PtrRecord.cs
Normal file
@ -0,0 +1,44 @@
|
|||||||
|
using System;
|
||||||
|
using System.Linq;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/* RFC 1035 (https://tools.ietf.org/html/rfc1035#section-3.3.12)
|
||||||
|
3.3.12. PTR RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ PTRDNAME /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
PTRDNAME A <domain-name> which points to some location in the
|
||||||
|
domain name space.
|
||||||
|
|
||||||
|
PTR records cause no additional section processing. These RRs are used
|
||||||
|
in special domains to point to some other location in the domain space.
|
||||||
|
These records are simple data, and don't imply any special processing
|
||||||
|
similar to that performed by CNAME, which identifies aliases. See the
|
||||||
|
description of the IN-ADDR.ARPA domain for an example.
|
||||||
|
*/
|
||||||
|
public class PtrRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public string PtrDomainName { get; }
|
||||||
|
|
||||||
|
internal PtrRecord(ResourceRecordInfo info, string ptrDName)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
if (string.IsNullOrWhiteSpace(ptrDName))
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(ptrDName));
|
||||||
|
}
|
||||||
|
|
||||||
|
PtrDomainName = ptrDName;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return PtrDomainName;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
@ -0,0 +1,56 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Linq;
|
||||||
|
using DnsClient.Protocol;
|
||||||
|
using DnsClient.Protocol.Record;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
public static class RecordCollectionExtension
|
||||||
|
{
|
||||||
|
public static IEnumerable<AAAARecord> AaaaRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<AAAARecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<ARecord> ARecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<ARecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<CaaRecord> CaaRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<CaaRecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<NsRecord> NsRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<NsRecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<DnsResourceRecord> OfRecordType(this IEnumerable<DnsResourceRecord> records, ResourceRecordType type)
|
||||||
|
{
|
||||||
|
return records.Where(p => p.RecordType == type);
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<PtrRecord> PtrRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<PtrRecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<SoaRecord> SoaRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<SoaRecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<SrvRecord> SrvRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<SrvRecord>();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static IEnumerable<TxtRecord> TxtRecords(this IEnumerable<DnsResourceRecord> records)
|
||||||
|
{
|
||||||
|
return records.OfType<TxtRecord>();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
111
MailServer/MailServer/DNS/Protocol/Record/SoaRecord.cs
Normal file
111
MailServer/MailServer/DNS/Protocol/Record/SoaRecord.cs
Normal file
@ -0,0 +1,111 @@
|
|||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
3.3.13. SOA RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ MNAME /
|
||||||
|
/ /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ RNAME /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| SERIAL |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| REFRESH |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| RETRY |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| EXPIRE |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
| MINIMUM |
|
||||||
|
| |
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
MNAME The <domain-name> of the name server that was the
|
||||||
|
original or primary source of data for this zone.
|
||||||
|
|
||||||
|
RNAME A <domain-name> which specifies the mailbox of the
|
||||||
|
person responsible for this zone.
|
||||||
|
|
||||||
|
SERIAL The unsigned 32 bit version number of the original copy
|
||||||
|
of the zone. Zone transfers preserve this value. This
|
||||||
|
value wraps and should be compared using sequence space
|
||||||
|
arithmetic.
|
||||||
|
|
||||||
|
REFRESH A 32 bit time interval before the zone should be
|
||||||
|
refreshed.
|
||||||
|
|
||||||
|
RETRY A 32 bit time interval that should elapse before a
|
||||||
|
failed refresh should be retried.
|
||||||
|
|
||||||
|
EXPIRE A 32 bit time value that specifies the upper limit on
|
||||||
|
the time interval that can elapse before the zone is no
|
||||||
|
longer authoritative.
|
||||||
|
|
||||||
|
MINIMUM The unsigned 32 bit minimum TTL field that should be
|
||||||
|
exported with any RR from this zone.
|
||||||
|
|
||||||
|
SOA records cause no additional section processing.
|
||||||
|
|
||||||
|
All times are in units of seconds.
|
||||||
|
|
||||||
|
Most of these fields are pertinent only for name server maintenance
|
||||||
|
operations. However, MINIMUM is used in all query operations that
|
||||||
|
retrieve RRs from a zone. Whenever a RR is sent in a response to a
|
||||||
|
query, the TTL field is set to the maximum of the TTL field from the RR
|
||||||
|
and the MINIMUM field in the appropriate SOA. Thus MINIMUM is a lower
|
||||||
|
bound on the TTL field for all RRs in a zone. Note that this use of
|
||||||
|
MINIMUM should occur when the RRs are copied into the response and not
|
||||||
|
when the zone is loaded from a master file or via a zone transfer. The
|
||||||
|
reason for this provison is to allow future dynamic update facilities to
|
||||||
|
change the SOA RR with known semantics.
|
||||||
|
*/
|
||||||
|
|
||||||
|
public class SoaRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public uint Expire { get; }
|
||||||
|
|
||||||
|
public uint Minimum { get; }
|
||||||
|
|
||||||
|
public string MName { get; }
|
||||||
|
|
||||||
|
public uint Refresh { get; }
|
||||||
|
|
||||||
|
public uint Retry { get; }
|
||||||
|
|
||||||
|
public string RName { get; }
|
||||||
|
|
||||||
|
public uint Serial { get; }
|
||||||
|
|
||||||
|
public SoaRecord(ResourceRecordInfo info, string mName, string rName, uint serial, uint refresh, uint retry, uint expire, uint minimum)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
MName = mName;
|
||||||
|
RName = rName;
|
||||||
|
Serial = serial;
|
||||||
|
Refresh = refresh;
|
||||||
|
Retry = retry;
|
||||||
|
Expire = expire;
|
||||||
|
Minimum = minimum;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return string.Format(
|
||||||
|
"{0} {1} {2} {3} {4} {5} {6}",
|
||||||
|
MName,
|
||||||
|
RName,
|
||||||
|
Serial,
|
||||||
|
Refresh,
|
||||||
|
Retry,
|
||||||
|
Expire,
|
||||||
|
Minimum);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
147
MailServer/MailServer/DNS/Protocol/Record/SrvRecord.cs
Normal file
147
MailServer/MailServer/DNS/Protocol/Record/SrvRecord.cs
Normal file
@ -0,0 +1,147 @@
|
|||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/* RFC 2782 (https://tools.ietf.org/html/rfc2782)
|
||||||
|
|
||||||
|
The format of the SRV RR
|
||||||
|
|
||||||
|
Here is the format of the SRV RR, whose DNS type code is 33:
|
||||||
|
|
||||||
|
_Service._Proto.Name TTL Class SRV Priority Weight Port Target
|
||||||
|
|
||||||
|
(There is an example near the end of this document.)
|
||||||
|
|
||||||
|
Service
|
||||||
|
The symbolic name of the desired service, as defined in Assigned
|
||||||
|
Numbers [STD 2] or locally. An underscore (_) is prepended to
|
||||||
|
the service identifier to avoid collisions with DNS labels that
|
||||||
|
occur in nature.
|
||||||
|
Some widely used services, notably POP, don't have a single
|
||||||
|
universal name. If Assigned Numbers names the service
|
||||||
|
indicated, that name is the only name which is legal for SRV
|
||||||
|
lookups. The Service is case insensitive.
|
||||||
|
|
||||||
|
Proto
|
||||||
|
The symbolic name of the desired protocol, with an underscore
|
||||||
|
(_) prepended to prevent collisions with DNS labels that occur
|
||||||
|
in nature. _TCP and _UDP are at present the most useful values
|
||||||
|
for this field, though any name defined by Assigned Numbers or
|
||||||
|
locally may be used (as for Service). The Proto is case
|
||||||
|
insensitive.
|
||||||
|
|
||||||
|
Name
|
||||||
|
The domain this RR refers to. The SRV RR is unique in that the
|
||||||
|
name one searches for is not this name; the example near the end
|
||||||
|
shows this clearly.
|
||||||
|
|
||||||
|
TTL
|
||||||
|
Standard DNS meaning [RFC 1035].
|
||||||
|
|
||||||
|
Class
|
||||||
|
Standard DNS meaning [RFC 1035]. SRV records occur in the IN
|
||||||
|
Class.
|
||||||
|
|
||||||
|
Priority
|
||||||
|
The priority of this target host. A client MUST attempt to
|
||||||
|
contact the target host with the lowest-numbered priority it can
|
||||||
|
reach; target hosts with the same priority SHOULD be tried in an
|
||||||
|
order defined by the weight field. The range is 0-65535. This
|
||||||
|
is a 16 bit unsigned integer in network byte order.
|
||||||
|
|
||||||
|
Weight
|
||||||
|
A server selection mechanism. The weight field specifies a
|
||||||
|
relative weight for entries with the same priority. Larger
|
||||||
|
weights SHOULD be given a proportionately higher probability of
|
||||||
|
being selected. The range of this number is 0-65535. This is a
|
||||||
|
16 bit unsigned integer in network byte order. Domain
|
||||||
|
administrators SHOULD use Weight 0 when there isn't any server
|
||||||
|
selection to do, to make the RR easier to read for humans (less
|
||||||
|
noisy). In the presence of records containing weights greater
|
||||||
|
than 0, records with weight 0 should have a very small chance of
|
||||||
|
being selected.
|
||||||
|
|
||||||
|
In the absence of a protocol whose specification calls for the
|
||||||
|
use of other weighting information, a client arranges the SRV
|
||||||
|
RRs of the same Priority in the order in which target hosts,
|
||||||
|
|
||||||
|
specified by the SRV RRs, will be contacted. The following
|
||||||
|
algorithm SHOULD be used to order the SRV RRs of the same
|
||||||
|
priority:
|
||||||
|
|
||||||
|
To select a target to be contacted next, arrange all SRV RRs
|
||||||
|
(that have not been ordered yet) in any order, except that all
|
||||||
|
those with weight 0 are placed at the beginning of the list.
|
||||||
|
|
||||||
|
Compute the sum of the weights of those RRs, and with each RR
|
||||||
|
associate the running sum in the selected order. Then choose a
|
||||||
|
uniform random number between 0 and the sum computed
|
||||||
|
(inclusive), and select the RR whose running sum value is the
|
||||||
|
first in the selected order which is greater than or equal to
|
||||||
|
the random number selected. The target host specified in the
|
||||||
|
selected SRV RR is the next one to be contacted by the client.
|
||||||
|
Remove this SRV RR from the set of the unordered SRV RRs and
|
||||||
|
apply the described algorithm to the unordered SRV RRs to select
|
||||||
|
the next target host. Continue the ordering process until there
|
||||||
|
are no unordered SRV RRs. This process is repeated for each
|
||||||
|
Priority.
|
||||||
|
|
||||||
|
Port
|
||||||
|
The port on this target host of this service. The range is 0-
|
||||||
|
65535. This is a 16 bit unsigned integer in network byte order.
|
||||||
|
This is often as specified in Assigned Numbers but need not be.
|
||||||
|
|
||||||
|
Target
|
||||||
|
The domain name of the target host. There MUST be one or more
|
||||||
|
address records for this name, the name MUST NOT be an alias (in
|
||||||
|
the sense of RFC 1034 or RFC 2181). Implementors are urged, but
|
||||||
|
not required, to return the address record(s) in the Additional
|
||||||
|
Data section. Unless and until permitted by future standards
|
||||||
|
action, name compression is not to be used for this field.
|
||||||
|
|
||||||
|
A Target of "." means that the service is decidedly not
|
||||||
|
available at this domain.
|
||||||
|
|
||||||
|
*/
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The SRV RR allows administrators to use several servers for a single
|
||||||
|
/// domain, to move services from host to host with little fuss, and to
|
||||||
|
/// designate some hosts as primary servers for a service and others as
|
||||||
|
/// backups.
|
||||||
|
///
|
||||||
|
/// Clients ask for a specific service/protocol for a specific domain
|
||||||
|
/// (the word domain is used here in the strict RFC 1034 sense), and get
|
||||||
|
/// back the names of any available servers.
|
||||||
|
///
|
||||||
|
/// Note that where this document refers to "address records", it means A
|
||||||
|
/// RR's, AAAA RR's, or their most modern equivalent.
|
||||||
|
/// </summary>
|
||||||
|
public class SrvRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
public ushort Port { get; }
|
||||||
|
|
||||||
|
public ushort Priority { get; }
|
||||||
|
|
||||||
|
public string Target { get; }
|
||||||
|
|
||||||
|
public ushort Weight { get; }
|
||||||
|
|
||||||
|
public SrvRecord(ResourceRecordInfo info, ushort priority, ushort weigth, ushort port, string target)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
Priority = priority;
|
||||||
|
Weight = weigth;
|
||||||
|
Port = port;
|
||||||
|
Target = target;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return string.Format(
|
||||||
|
"{0} {1} {2} {3}",
|
||||||
|
Priority,
|
||||||
|
Weight,
|
||||||
|
Port,
|
||||||
|
Target);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
57
MailServer/MailServer/DNS/Protocol/Record/TxtRecord.cs
Normal file
57
MailServer/MailServer/DNS/Protocol/Record/TxtRecord.cs
Normal file
@ -0,0 +1,57 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
|
||||||
|
namespace DnsClient.Protocol.Record
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* RFC 1464 https://tools.ietf.org/html/rfc1464
|
||||||
|
|
||||||
|
https://tools.ietf.org/html/rfc1035#section-3.3:
|
||||||
|
<character-string> is a single
|
||||||
|
length octet followed by that number of characters. <character-string>
|
||||||
|
is treated as binary information, and can be up to 256 characters in
|
||||||
|
length (including the length octet).
|
||||||
|
|
||||||
|
https://tools.ietf.org/html/rfc1035#section-3.3.14:
|
||||||
|
TXT RDATA format
|
||||||
|
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
/ TXT-DATA /
|
||||||
|
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
||||||
|
|
||||||
|
where:
|
||||||
|
|
||||||
|
TXT-DATA One or more <character-string>s.
|
||||||
|
|
||||||
|
TXT RRs are used to hold descriptive text. The semantics of the text
|
||||||
|
depends on the domain where it is found.
|
||||||
|
*/
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// TXT RRs are used to hold descriptive text. The semantics of the text
|
||||||
|
/// depends on the domain where it is found.
|
||||||
|
/// </summary>
|
||||||
|
public class TxtRecord : DnsResourceRecord
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// The list of TXT values of this TXT RR.
|
||||||
|
/// </summary>
|
||||||
|
public IReadOnlyCollection<string> Text { get; }
|
||||||
|
|
||||||
|
public TxtRecord(ResourceRecordInfo info, string[] values)
|
||||||
|
: base(info)
|
||||||
|
{
|
||||||
|
if (values == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(values));
|
||||||
|
}
|
||||||
|
|
||||||
|
Text = values;
|
||||||
|
}
|
||||||
|
|
||||||
|
public override string RecordToString()
|
||||||
|
{
|
||||||
|
return string.Join(" ", Text).Trim();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
47
MailServer/MailServer/DNS/QueryClass.cs
Normal file
47
MailServer/MailServer/DNS/QueryClass.cs
Normal file
@ -0,0 +1,47 @@
|
|||||||
|
using System;
|
||||||
|
using System.Linq;
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/* RFC 1035 (https://tools.ietf.org/html/rfc1035#section-3.2.4)
|
||||||
|
* 3.2.4. CLASS values
|
||||||
|
*
|
||||||
|
CLASS fields appear in resource records. The following CLASS mnemonics
|
||||||
|
and values are defined:
|
||||||
|
|
||||||
|
IN 1 the Internet
|
||||||
|
|
||||||
|
CS 2 the CSNET class (Obsolete - used only for examples in
|
||||||
|
some obsolete RFCs)
|
||||||
|
|
||||||
|
CH 3 the CHAOS class
|
||||||
|
|
||||||
|
HS 4 Hesiod [Dyer 87]
|
||||||
|
|
||||||
|
*/
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// CLASS fields appear in resource records.
|
||||||
|
/// </summary>
|
||||||
|
public enum QueryClass : short
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// The Internet.
|
||||||
|
/// </summary>
|
||||||
|
IN = 1,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The CSNET class (Obsolete - used only for examples in some obsolete RFCs).
|
||||||
|
/// </summary>
|
||||||
|
CS = 2,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The CHAOS class.
|
||||||
|
/// </summary>
|
||||||
|
CH = 3,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Hesiod [Dyer 87].
|
||||||
|
/// </summary>
|
||||||
|
HS = 4
|
||||||
|
}
|
||||||
|
}
|
116
MailServer/MailServer/DNS/QueryType.cs
Normal file
116
MailServer/MailServer/DNS/QueryType.cs
Normal file
@ -0,0 +1,116 @@
|
|||||||
|
using System;
|
||||||
|
using System.Linq;
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* RFC 1035 (https://tools.ietf.org/html/rfc1035#section-3.2.3)
|
||||||
|
* */
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// QTYPE fields appear in the question part of a query. QTYPES are a superset of TYPEs, hence all TYPEs are valid QTYPEs.
|
||||||
|
/// </summary>
|
||||||
|
public enum QueryType : short
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// A host address [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
A = 1,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// An authoritative name server [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
NS = 2,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail destination (OBSOLETE - use MX) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MD = 3,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail forwarder (OBSOLETE - use MX) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MF = 4,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The canonical name for an alias [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
CNAME = 5,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Marks the start of a zone of authority [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
SOA = 6,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mailbox domain name (EXPERIMENTAL) [RFC1035]. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
MB = 7,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail group member (EXPERIMENTAL) [RFC1035]. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
MG = 8,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail rename domain name (EXPERIMENTAL) [RFC1035]. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
MR = 9,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A null RR (EXPERIMENTAL) [RFC1035]. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
NULL = 10,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A well known service description [RFC1035] TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
WKS = 11,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A domain name pointer [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
PTR = 12,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Host information [RFC1035] TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
HINFO = 13,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Mailbox or mail list information [RFC1035] TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
MINFO = 14,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Mail exchange [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
MX = 15,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Text strings [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
TXT = 16,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A IPV6 host address, [RFC3596]
|
||||||
|
/// </summary>
|
||||||
|
AAAA = 28,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Location of services [RFC2782]
|
||||||
|
/// </summary>
|
||||||
|
SRV = 33,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RRSIG rfc3755. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
RRSIG = 46,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Generic any query *.
|
||||||
|
/// </summary>
|
||||||
|
ANY = 255,
|
||||||
|
|
||||||
|
CAA = 257,
|
||||||
|
}
|
||||||
|
}
|
114
MailServer/MailServer/DNS/ResourceRecordType.cs
Normal file
114
MailServer/MailServer/DNS/ResourceRecordType.cs
Normal file
@ -0,0 +1,114 @@
|
|||||||
|
using System;
|
||||||
|
using System.Linq;
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* RFC 1035 (https://tools.ietf.org/html/rfc1035#section-3.2.2)
|
||||||
|
* */
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// TYPE fields are used in resource records. Note that these types are a subset of QTYPEs.
|
||||||
|
/// </summary>
|
||||||
|
public enum ResourceRecordType : short
|
||||||
|
{
|
||||||
|
/// <summary>
|
||||||
|
/// A host address [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
A = 1,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// An authoritative name server [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
NS = 2,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail destination (OBSOLETE - use MX) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MD = 3,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail forwarder (OBSOLETE - use MX) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MF = 4,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// The canonical name for an alias [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
CNAME = 5,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Marks the start of a zone of authority [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
SOA = 6,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mailbox domain name (EXPERIMENTAL) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MB = 7,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail group member (EXPERIMENTAL) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MG = 8,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A mail rename domain name (EXPERIMENTAL) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
MR = 9,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A null RR (EXPERIMENTAL) [RFC1035].
|
||||||
|
/// </summary>
|
||||||
|
NULL = 10,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A well known service description [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
WKS = 11,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A domain name pointer [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
PTR = 12,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Host information [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
HINFO = 13,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Mailbox or mail list information [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
MINFO = 14,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Mail exchange [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
MX = 15,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Text strings [RFC1035]
|
||||||
|
/// </summary>
|
||||||
|
TXT = 16,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// A IPV6 host address, [RFC3596]
|
||||||
|
/// </summary>
|
||||||
|
AAAA = 28,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// Location of services [RFC2782]
|
||||||
|
/// </summary>
|
||||||
|
SRV = 33,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// RRSIG rfc3755. TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
RRSIG = 46,
|
||||||
|
|
||||||
|
/// <summary>
|
||||||
|
/// TODO:impl
|
||||||
|
/// </summary>
|
||||||
|
CAA = 257,
|
||||||
|
}
|
||||||
|
}
|
154
MailServer/MailServer/DNS/ResponseCache.cs
Normal file
154
MailServer/MailServer/DNS/ResponseCache.cs
Normal file
@ -0,0 +1,154 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Concurrent;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Threading;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
|
||||||
|
namespace DnsClient
|
||||||
|
{
|
||||||
|
internal class ResponseCache
|
||||||
|
{
|
||||||
|
private static readonly long CleanupInterval = (long)TimeSpan.FromMinutes(10).TotalMilliseconds;
|
||||||
|
private ConcurrentDictionary<string, ResponseEntry> _cache = new ConcurrentDictionary<string, ResponseEntry>();
|
||||||
|
private object _cleanupLock = new object();
|
||||||
|
private bool _cleanupRunning = false;
|
||||||
|
private int _lastCleanup = 0;
|
||||||
|
|
||||||
|
public int Count => _cache.Count;
|
||||||
|
|
||||||
|
public bool Enabled { get; set; }
|
||||||
|
|
||||||
|
public TimeSpan? MinimumTimout { get; set; }
|
||||||
|
|
||||||
|
public ResponseCache(bool enabled = true, TimeSpan? minimumTimout = null)
|
||||||
|
{
|
||||||
|
Enabled = enabled;
|
||||||
|
MinimumTimout = minimumTimout;
|
||||||
|
}
|
||||||
|
|
||||||
|
public static string GetCacheKey(DnsQuestion question)
|
||||||
|
{
|
||||||
|
if (question == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(question));
|
||||||
|
}
|
||||||
|
|
||||||
|
return question.QueryName + ":" + question.QuestionClass + ":" + question.QuestionType;
|
||||||
|
}
|
||||||
|
|
||||||
|
public async Task<DnsQueryResponse> GetOrAdd(string key, Func<Task<DnsQueryResponse>> create)
|
||||||
|
{
|
||||||
|
if (create == null)
|
||||||
|
{
|
||||||
|
throw new ArgumentNullException(nameof(create));
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!Enabled)
|
||||||
|
{
|
||||||
|
return await create();
|
||||||
|
}
|
||||||
|
|
||||||
|
ResponseEntry entry;
|
||||||
|
if (_cache.TryGetValue(key, out entry))
|
||||||
|
{
|
||||||
|
if (entry.IsExpired)
|
||||||
|
{
|
||||||
|
_cache.TryRemove(key, out entry);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
return entry.Response;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
var record = await create();
|
||||||
|
|
||||||
|
// only cache in case the result is valid and does need caching
|
||||||
|
if (record != null)
|
||||||
|
{
|
||||||
|
var newEntry = CreatedEntry(record);
|
||||||
|
|
||||||
|
// respecting minimum expiration value which gets evaluated in CreateEntry
|
||||||
|
if (newEntry.TTL > 0)
|
||||||
|
{
|
||||||
|
_cache.TryAdd(key, newEntry);
|
||||||
|
|
||||||
|
StartCleanup();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return record;
|
||||||
|
}
|
||||||
|
|
||||||
|
private static void DoCleanup(ResponseCache cache)
|
||||||
|
{
|
||||||
|
cache._cleanupRunning = true;
|
||||||
|
|
||||||
|
foreach (var entry in cache._cache)
|
||||||
|
{
|
||||||
|
if (entry.Value.IsExpired)
|
||||||
|
{
|
||||||
|
ResponseEntry o;
|
||||||
|
cache._cache.TryRemove(entry.Key, out o);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
cache._cleanupRunning = false;
|
||||||
|
}
|
||||||
|
|
||||||
|
private ResponseEntry CreatedEntry(DnsQueryResponse response)
|
||||||
|
{
|
||||||
|
var entry = new ResponseEntry(response);
|
||||||
|
|
||||||
|
// minimum timeout
|
||||||
|
if (MinimumTimout.HasValue && entry.TTL < MinimumTimout.Value.TotalMilliseconds)
|
||||||
|
{
|
||||||
|
entry.TTL = (long)MinimumTimout.Value.TotalMilliseconds;
|
||||||
|
}
|
||||||
|
|
||||||
|
return entry;
|
||||||
|
}
|
||||||
|
|
||||||
|
private void StartCleanup()
|
||||||
|
{
|
||||||
|
var currentTicks = Environment.TickCount;
|
||||||
|
if (!_cleanupRunning && _lastCleanup + CleanupInterval < currentTicks)
|
||||||
|
{
|
||||||
|
lock (_cleanupLock)
|
||||||
|
{
|
||||||
|
if (!_cleanupRunning && _lastCleanup + CleanupInterval < currentTicks)
|
||||||
|
{
|
||||||
|
_lastCleanup = currentTicks;
|
||||||
|
|
||||||
|
Task.Factory.StartNew(
|
||||||
|
state => DoCleanup((ResponseCache)state),
|
||||||
|
this,
|
||||||
|
CancellationToken.None,
|
||||||
|
TaskCreationOptions.DenyChildAttach,
|
||||||
|
TaskScheduler.Default);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private class ResponseEntry
|
||||||
|
{
|
||||||
|
public bool IsExpired => Environment.TickCount > TicksCreated + TTL;
|
||||||
|
|
||||||
|
public DnsQueryResponse Response { get; set; }
|
||||||
|
|
||||||
|
public int TicksCreated { get; }
|
||||||
|
|
||||||
|
public long TTL { get; set; }
|
||||||
|
|
||||||
|
public ResponseEntry(DnsQueryResponse response)
|
||||||
|
{
|
||||||
|
var minTtl = response.AllRecords.Min(p => p?.TimeToLive);
|
||||||
|
|
||||||
|
Response = response;
|
||||||
|
TTL = response.HasError || !minTtl.HasValue ? 0 : (int)minTtl.Value * 1000; // ttl is in second, we calculate in millis
|
||||||
|
TicksCreated = Environment.TickCount;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
35
MailServer/MailServer/DNS/TaskExtensions.cs
Normal file
35
MailServer/MailServer/DNS/TaskExtensions.cs
Normal file
@ -0,0 +1,35 @@
|
|||||||
|
namespace System.Threading.Tasks
|
||||||
|
{
|
||||||
|
internal static class TaskExtensions
|
||||||
|
{
|
||||||
|
public static async Task TimeoutAfter(this Task task, TimeSpan timeout)
|
||||||
|
{
|
||||||
|
var cts = new CancellationTokenSource();
|
||||||
|
|
||||||
|
if (task == await Task.WhenAny(task, Task.Delay((int)timeout.TotalMilliseconds, cts.Token)))
|
||||||
|
{
|
||||||
|
cts.Cancel();
|
||||||
|
await task;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
throw new TimeoutException();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static async Task<TResult> TimeoutAfter<TResult>(this Task<TResult> task, TimeSpan timeout)
|
||||||
|
{
|
||||||
|
var cts = new CancellationTokenSource();
|
||||||
|
|
||||||
|
if (task == await Task.WhenAny(task, Task.Delay((int)timeout.TotalMilliseconds, cts.Token)))
|
||||||
|
{
|
||||||
|
cts.Cancel();
|
||||||
|
return await task;
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
throw new TimeoutException();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
52
MailServer/MailServer/DNS/project.json
Normal file
52
MailServer/MailServer/DNS/project.json
Normal file
@ -0,0 +1,52 @@
|
|||||||
|
{
|
||||||
|
"version": "1.0.0-*",
|
||||||
|
"authors": [ "MichaCo" ],
|
||||||
|
"packOptions": {
|
||||||
|
"licenseUrl": "https://github.com/MichaCo/DnsClient.NET/blob/master/LICENSE",
|
||||||
|
"projectUrl": "https://github.com/MichaCo/DnsClient.NET",
|
||||||
|
"repository": {
|
||||||
|
"type": "git",
|
||||||
|
"url": "https://github.com/MichaCo/DnsClient.NET"
|
||||||
|
},
|
||||||
|
"summary": "A simple DNS client written in C#.",
|
||||||
|
"tags": [ "DNS", "Name Server", "CSharp", ".NET", ".NET Core" ]
|
||||||
|
},
|
||||||
|
"buildOptions": {
|
||||||
|
"allowUnsafe": false,
|
||||||
|
"languageVersion": "csharp6",
|
||||||
|
"warningsAsErrors": false,
|
||||||
|
"xmlDoc": true,
|
||||||
|
"keyFile": "../../Tools/key.snk"
|
||||||
|
},
|
||||||
|
"copyright": "Copyright (c) 2016 MichaConrad",
|
||||||
|
"configurations": {
|
||||||
|
"Debug": {
|
||||||
|
"buildOptions": {
|
||||||
|
"define": [ "DEBUG" ]
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"Release": {
|
||||||
|
"buildOptions": {
|
||||||
|
"define": [ "RELEASE" ],
|
||||||
|
"optimize": true
|
||||||
|
}
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"dependencies": {
|
||||||
|
},
|
||||||
|
"frameworks": {
|
||||||
|
"netstandard1.3": {
|
||||||
|
"dependencies": {
|
||||||
|
"NETStandard.Library": "1.6.0",
|
||||||
|
"System.Net.NameResolution": "4.0.0",
|
||||||
|
"System.Net.NetworkInformation": "4.3.0",
|
||||||
|
"System.Runtime": "4.3.0"
|
||||||
|
},
|
||||||
|
"buildOptions": { "define": [ "XPLAT" ] }
|
||||||
|
},
|
||||||
|
"net45": {
|
||||||
|
"frameworkAssemblies": {
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
@ -38,12 +38,12 @@ using System.IO;
|
|||||||
using System.Net;
|
using System.Net;
|
||||||
using System.Net.Sockets;
|
using System.Net.Sockets;
|
||||||
using System.Net.NetworkInformation;
|
using System.Net.NetworkInformation;
|
||||||
using System.Security.Permissions;
|
|
||||||
using System.Text;
|
using System.Text;
|
||||||
|
|
||||||
using DnDns.Enums;
|
using DnDns.Enums;
|
||||||
using DnDns.Records;
|
using DnDns.Records;
|
||||||
using DnDns.Security;
|
using DnDns.Security;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
|
||||||
namespace DnDns.Query
|
namespace DnDns.Query
|
||||||
{
|
{
|
||||||
@ -54,8 +54,6 @@ namespace DnDns.Query
|
|||||||
{
|
{
|
||||||
private static Random r = new Random();
|
private static Random r = new Random();
|
||||||
|
|
||||||
private DnsPermission _dnsPermissions;
|
|
||||||
|
|
||||||
private int _bytesSent = 0;
|
private int _bytesSent = 0;
|
||||||
private int _socketTimeout = 5000;
|
private int _socketTimeout = 5000;
|
||||||
|
|
||||||
@ -80,8 +78,6 @@ namespace DnDns.Query
|
|||||||
#region Constructors
|
#region Constructors
|
||||||
public DnsQueryRequest()
|
public DnsQueryRequest()
|
||||||
{
|
{
|
||||||
_dnsPermissions = new DnsPermission(PermissionState.Unrestricted);
|
|
||||||
|
|
||||||
// Construct the class with some defaults
|
// Construct the class with some defaults
|
||||||
_transactionId = (ushort) r.Next();
|
_transactionId = (ushort) r.Next();
|
||||||
_flags = 0;
|
_flags = 0;
|
||||||
@ -151,16 +147,16 @@ namespace DnDns.Query
|
|||||||
/// <param name="queryClass"></param>
|
/// <param name="queryClass"></param>
|
||||||
/// <param name="protocol"></param>
|
/// <param name="protocol"></param>
|
||||||
/// <returns></returns>
|
/// <returns></returns>
|
||||||
public DnsQueryResponse Resolve(string host, NsType queryType, NsClass queryClass, ProtocolType protocol)
|
public async Task<DnsQueryResponse> ResolveAsync(string host, NsType queryType, NsClass queryClass, ProtocolType protocol)
|
||||||
{
|
{
|
||||||
return Resolve(host, queryType, queryClass, protocol, null);
|
return await ResolveAsync(host, queryType, queryClass, protocol, null);
|
||||||
}
|
}
|
||||||
|
|
||||||
public DnsQueryResponse Resolve(string host, NsType queryType, NsClass queryClass, ProtocolType protocol, TsigMessageSecurityProvider provider)
|
public async Task<DnsQueryResponse> ResolveAsync(string host, NsType queryType, NsClass queryClass, ProtocolType protocol, TsigMessageSecurityProvider provider)
|
||||||
{
|
{
|
||||||
string dnsServer = string.Empty;
|
string dnsServer = string.Empty;
|
||||||
|
dnsServer = "8.8.8.8";
|
||||||
// Test for Unix/Linux OS
|
/*// Test for Unix/Linux OS
|
||||||
if (Tools.IsPlatformLinuxUnix())
|
if (Tools.IsPlatformLinuxUnix())
|
||||||
{
|
{
|
||||||
dnsServer = Tools.DiscoverUnixDnsServerAddress();
|
dnsServer = Tools.DiscoverUnixDnsServerAddress();
|
||||||
@ -176,9 +172,8 @@ namespace DnDns.Query
|
|||||||
|
|
||||||
if (String.IsNullOrEmpty(dnsServer))
|
if (String.IsNullOrEmpty(dnsServer))
|
||||||
throw new Exception("Couldn't detect local DNS Server.");
|
throw new Exception("Couldn't detect local DNS Server.");
|
||||||
|
*/
|
||||||
return Resolve(dnsServer, host, queryType, queryClass, protocol, provider);
|
return await ResolveAsync(dnsServer, host, queryType, queryClass, protocol, provider);
|
||||||
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/// <summary>
|
/// <summary>
|
||||||
@ -194,15 +189,12 @@ namespace DnDns.Query
|
|||||||
/// <PermissionSet>
|
/// <PermissionSet>
|
||||||
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
|
/// <IPermission class="System.Net.DnsPermission, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
|
||||||
/// </PermissionSet>
|
/// </PermissionSet>
|
||||||
public DnsQueryResponse Resolve(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
|
public async Task<DnsQueryResponse> ResolveAsync(string dnsServer, string host, NsType queryType, NsClass queryClass, ProtocolType protocol, IMessageSecurityProvider messageSecurityProvider)
|
||||||
{
|
{
|
||||||
// Do stack walk and Demand all callers have DnsPermission.
|
|
||||||
_dnsPermissions.Demand();
|
|
||||||
|
|
||||||
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
|
byte[] bDnsQuery = this.BuildDnsRequest(host, queryType, queryClass, protocol, messageSecurityProvider);
|
||||||
|
|
||||||
// Connect to DNS server and get the record for the current server.
|
// Connect to DNS server and get the record for the current server.
|
||||||
IPHostEntry ipe = System.Net.Dns.GetHostEntry(dnsServer);
|
IPHostEntry ipe = await Dns.GetHostEntryAsync(dnsServer);
|
||||||
IPAddress ipa = ipe.AddressList[0];
|
IPAddress ipa = ipe.AddressList[0];
|
||||||
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);
|
IPEndPoint ipep = new IPEndPoint(ipa, (int)UdpServices.Domain);
|
||||||
|
|
||||||
@ -226,7 +218,11 @@ namespace DnDns.Query
|
|||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
Trace.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
|
//Console.Assert(recvBytes != null, "Failed to retrieve data from the remote DNS server.");
|
||||||
|
if(recvBytes == null)
|
||||||
|
{
|
||||||
|
Logging.AddLogMessage(Logging.LoggingType.ERROR, "Failed to retrieve data from the remote DNS server.");
|
||||||
|
}
|
||||||
|
|
||||||
DnsQueryResponse dnsQR = new DnsQueryResponse();
|
DnsQueryResponse dnsQR = new DnsQueryResponse();
|
||||||
|
|
||||||
@ -238,59 +234,71 @@ namespace DnDns.Query
|
|||||||
private byte[] ResolveUdp(byte[] bDnsQuery, IPEndPoint ipep)
|
private byte[] ResolveUdp(byte[] bDnsQuery, IPEndPoint ipep)
|
||||||
{
|
{
|
||||||
// UDP messages, data size = 512 octets or less
|
// UDP messages, data size = 512 octets or less
|
||||||
UdpClient udpClient = new UdpClient();
|
//UdpClient udpClient = new UdpClient();
|
||||||
|
|
||||||
|
Socket udp = new Socket(SocketType.Dgram, ProtocolType.Udp);
|
||||||
byte[] recvBytes = null;
|
byte[] recvBytes = null;
|
||||||
|
|
||||||
try
|
try
|
||||||
{
|
{
|
||||||
udpClient.Client.ReceiveTimeout = _socketTimeout;
|
udp.ReceiveTimeout = _socketTimeout;
|
||||||
udpClient.Connect(ipep);
|
//udpClient.Client.ReceiveTimeout = _socketTimeout;
|
||||||
udpClient.Send(bDnsQuery, bDnsQuery.Length);
|
//udpClient.ConnectAsync(ipep);
|
||||||
recvBytes = udpClient.Receive(ref ipep);
|
udp.Connect(ipep);
|
||||||
|
//udpClient.Send(bDnsQuery, bDnsQuery.Length);
|
||||||
|
udp.Send(bDnsQuery);
|
||||||
|
//recvBytes = udpClient.Receive(ref ipep);
|
||||||
|
recvBytes = new byte[udp.ReceiveBufferSize];
|
||||||
|
udp.Receive(recvBytes);
|
||||||
}
|
}
|
||||||
finally
|
finally
|
||||||
{
|
{
|
||||||
udpClient.Close();
|
//udpClient.Close();
|
||||||
}
|
}
|
||||||
return recvBytes;
|
return recvBytes;
|
||||||
}
|
}
|
||||||
|
|
||||||
private static byte[] ResolveTcp(byte[] bDnsQuery, IPEndPoint ipep)
|
private static byte[] ResolveTcp(byte[] bDnsQuery, IPEndPoint ipep)
|
||||||
{
|
{
|
||||||
TcpClient tcpClient = new TcpClient();
|
Socket tcp = new Socket(SocketType.Stream, ProtocolType.Tcp);
|
||||||
|
|
||||||
|
//TcpClient tcpClient = new TcpClient();
|
||||||
byte[] recvBytes = null;
|
byte[] recvBytes = null;
|
||||||
|
|
||||||
try
|
try
|
||||||
{
|
{
|
||||||
tcpClient.Connect(ipep);
|
tcp.Connect(ipep);
|
||||||
|
//tcpClient.ConnectAsync(ipep);
|
||||||
NetworkStream netStream = tcpClient.GetStream();
|
//NetworkStream ns = tcp.Receive
|
||||||
BinaryReader netReader = new System.IO.BinaryReader(netStream);
|
//NetworkStream netStream = tcpClient.GetStream();
|
||||||
|
//BinaryReader netReader = new System.IO.BinaryReader(netStream);
|
||||||
netStream.Write(bDnsQuery, 0, bDnsQuery.Length);
|
|
||||||
|
|
||||||
|
//netStream.Write(bDnsQuery, 0, bDnsQuery.Length);
|
||||||
|
tcp.Send(bDnsQuery);
|
||||||
// wait until data is avail
|
// wait until data is avail
|
||||||
while (!netStream.DataAvailable) ;
|
//while (!netStream.DataAvailable) ;
|
||||||
|
while (tcp.Available < 1) ;
|
||||||
|
|
||||||
if (tcpClient.Connected && netStream.DataAvailable)
|
//if (tcpClient.Connected && netStream.DataAvailable)
|
||||||
|
if (tcp.Connected && tcp.Available > 1)
|
||||||
{
|
{
|
||||||
// Read first two bytes to find out the length of the response
|
// Read first two bytes to find out the length of the response
|
||||||
byte[] bLen = new byte[2];
|
byte[] bLen = new byte[2];
|
||||||
|
|
||||||
// NOTE: The order of the next two lines matter. Do not reorder
|
// NOTE: The order of the next two lines matter. Do not reorder
|
||||||
// Array indexes are also intentionally reversed
|
// Array indexes are also intentionally reversed
|
||||||
bLen[1] = (byte)netStream.ReadByte();
|
tcp.Receive(bLen, bLen.Length, SocketFlags.None);
|
||||||
bLen[0] = (byte)netStream.ReadByte();
|
//bLen[1] = (byte)netStream.ReadByte();
|
||||||
|
//bLen[0] = (byte)netStream.ReadByte();
|
||||||
|
|
||||||
UInt16 length = BitConverter.ToUInt16(bLen, 0);
|
UInt16 length = BitConverter.ToUInt16(bLen, 0);
|
||||||
|
|
||||||
recvBytes = new byte[length];
|
recvBytes = new byte[length];
|
||||||
netStream.Read(recvBytes, 0, length);
|
tcp.Receive(recvBytes, length, SocketFlags.None);
|
||||||
|
//netStream.Read(recvBytes, 0, length);
|
||||||
}
|
}
|
||||||
}
|
} catch (Exception e) {
|
||||||
finally
|
Logging.AddException(e);
|
||||||
{
|
|
||||||
tcpClient.Close();
|
|
||||||
}
|
}
|
||||||
return recvBytes;
|
return recvBytes;
|
||||||
}
|
}
|
||||||
@ -369,7 +377,7 @@ namespace DnDns.Query
|
|||||||
memoryStream.Write(data, 0, data.Length);
|
memoryStream.Write(data, 0, data.Length);
|
||||||
}
|
}
|
||||||
|
|
||||||
Trace.WriteLine(String.Format("The message bytes: {0}", DnsHelpers.DumpArrayToString(memoryStream.ToArray())));
|
Logging.AddLogMessage(Logging.LoggingType.INFO, String.Format("The message bytes: {0}", DnsHelpers.DumpArrayToString(memoryStream.ToArray())));
|
||||||
|
|
||||||
return memoryStream.ToArray();
|
return memoryStream.ToArray();
|
||||||
}
|
}
|
@ -335,4 +335,12 @@ namespace DnDns.Records
|
|||||||
|
|
||||||
#endregion
|
#endregion
|
||||||
}
|
}
|
||||||
|
|
||||||
|
internal class Trace
|
||||||
|
{
|
||||||
|
public static void WriteLine(string message)
|
||||||
|
{
|
||||||
|
Logging.AddLogMessage(Logging.LoggingType.INFO, message);
|
||||||
|
}
|
||||||
|
}
|
||||||
}
|
}
|
@ -39,6 +39,7 @@ using System.Net.NetworkInformation;
|
|||||||
using System.Net.Sockets;
|
using System.Net.Sockets;
|
||||||
|
|
||||||
using DnDns.Enums;
|
using DnDns.Enums;
|
||||||
|
using System.Runtime.InteropServices;
|
||||||
|
|
||||||
namespace DnDns
|
namespace DnDns
|
||||||
{
|
{
|
||||||
@ -66,20 +67,11 @@ namespace DnDns
|
|||||||
/// Tests to see if this is running on a Linux or Unix Platform
|
/// Tests to see if this is running on a Linux or Unix Platform
|
||||||
/// </summary>
|
/// </summary>
|
||||||
/// <returns>true if unix or linux is detected</returns>
|
/// <returns>true if unix or linux is detected</returns>
|
||||||
//public static bool IsPlatformLinuxUnix()
|
public static bool IsPlatformLinuxUnix()
|
||||||
//{
|
{
|
||||||
// int p = (int)Environment.OSVersion.Platform;
|
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) return false;
|
||||||
|
return true;
|
||||||
// Test for Unix / Linux OS
|
}
|
||||||
// if (p == 4 || p == 128)
|
|
||||||
// {
|
|
||||||
// return true;
|
|
||||||
// }
|
|
||||||
// else
|
|
||||||
// {
|
|
||||||
// return false;
|
|
||||||
// }
|
|
||||||
//}
|
|
||||||
|
|
||||||
/// <summary>
|
/// <summary>
|
||||||
/// Look up the port name for any given port number.
|
/// Look up the port name for any given port number.
|
||||||
@ -150,35 +142,35 @@ namespace DnDns
|
|||||||
return string.Empty;
|
return string.Empty;
|
||||||
}
|
}
|
||||||
|
|
||||||
public static IPAddressCollection DiscoverDnsServerAddresses()
|
//public static IPAddressCollection DiscoverDnsServerAddresses()
|
||||||
{
|
//{
|
||||||
NetworkInterface[] arrNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
|
// NetworkInterface[] arrNetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
|
||||||
|
|
||||||
foreach (NetworkInterface objNetworkInterface in arrNetworkInterfaces)
|
// foreach (NetworkInterface objNetworkInterface in arrNetworkInterfaces)
|
||||||
{
|
// {
|
||||||
if (
|
// if (
|
||||||
(objNetworkInterface.OperationalStatus == OperationalStatus.Up) &&
|
// (objNetworkInterface.OperationalStatus == OperationalStatus.Up) &&
|
||||||
(objNetworkInterface.Speed > 0) &&
|
// (objNetworkInterface.Speed > 0) &&
|
||||||
(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback) &&
|
// (objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback) &&
|
||||||
(objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Tunnel)
|
// (objNetworkInterface.NetworkInterfaceType != NetworkInterfaceType.Tunnel)
|
||||||
)
|
// )
|
||||||
{
|
// {
|
||||||
IPAddressCollection candidate = objNetworkInterface.GetIPProperties().DnsAddresses;
|
// IPAddressCollection candidate = objNetworkInterface.GetIPProperties().DnsAddresses;
|
||||||
bool found = false;
|
// bool found = false;
|
||||||
foreach (IPAddress addr in candidate)
|
// foreach (IPAddress addr in candidate)
|
||||||
{
|
// {
|
||||||
// Make this collection contains IPv4 addresses only
|
// // Make this collection contains IPv4 addresses only
|
||||||
if (addr.AddressFamily == AddressFamily.InterNetwork)
|
// if (addr.AddressFamily == AddressFamily.InterNetwork)
|
||||||
found = true;
|
// found = true;
|
||||||
}
|
// }
|
||||||
|
|
||||||
if (found)
|
// if (found)
|
||||||
return candidate;
|
// return candidate;
|
||||||
}
|
// }
|
||||||
}
|
// }
|
||||||
|
|
||||||
return null;
|
// return null;
|
||||||
}
|
//}
|
||||||
|
|
||||||
//public static uint ByteToUInt(byte[] theByte)
|
//public static uint ByteToUInt(byte[] theByte)
|
||||||
//{
|
//{
|
40
MailServer/MailServer/Database.cs
Normal file
40
MailServer/MailServer/Database.cs
Normal file
@ -0,0 +1,40 @@
|
|||||||
|
using Microsoft.EntityFrameworkCore;
|
||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.IO;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public class MysqlDB : DbContext
|
||||||
|
{
|
||||||
|
const string Hostname = "192.168.178.148";
|
||||||
|
const string DatabaseName = "vmail";
|
||||||
|
const string Uid = "root";
|
||||||
|
const string Pwd = "fabian.11";
|
||||||
|
|
||||||
|
public DbSet<Domains> Domains { get; set; }
|
||||||
|
|
||||||
|
public DbSet<Accounts> Accounts { get; set; }
|
||||||
|
|
||||||
|
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
|
||||||
|
=> optionsBuilder.UseMySql(@"Server=" + Hostname + ";database=" + DatabaseName + ";uid=" + Uid + ";pwd=" + Pwd + ";");
|
||||||
|
}
|
||||||
|
|
||||||
|
public class Domains
|
||||||
|
{
|
||||||
|
public int Id { get; set; }
|
||||||
|
public string Domain { get; set; }
|
||||||
|
public bool IsMail { get; set; }
|
||||||
|
}
|
||||||
|
|
||||||
|
public class Accounts
|
||||||
|
{
|
||||||
|
public int Id { get; set; }
|
||||||
|
public string Name { get; set; }
|
||||||
|
public int Domain { get; set; }
|
||||||
|
public string Password { get; set; }
|
||||||
|
public bool Active { get; set; }
|
||||||
|
}
|
||||||
|
}
|
71
MailServer/MailServer/GetDNSEntries.cs
Normal file
71
MailServer/MailServer/GetDNSEntries.cs
Normal file
@ -0,0 +1,71 @@
|
|||||||
|
using DnsClient;
|
||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.IO;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public class GetDNSEntries
|
||||||
|
{
|
||||||
|
public static async System.Threading.Tasks.Task<string[]> GetMXRecordAsync(string domain) => await GetMXRecordAsync(domain, 0);
|
||||||
|
|
||||||
|
public static async System.Threading.Tasks.Task<string[]> GetMXRecordAsync(string domain, int nr)
|
||||||
|
{
|
||||||
|
var lookup = new LookupClient();
|
||||||
|
var result = await lookup.QueryAsync(domain, QueryType.MX);
|
||||||
|
|
||||||
|
var records = result.AllRecords.ToArray();
|
||||||
|
|
||||||
|
//ToDo priority sorting
|
||||||
|
|
||||||
|
var rec = new string[records.Length];
|
||||||
|
|
||||||
|
for(int i = 0; i < records.Length; i++)
|
||||||
|
{
|
||||||
|
var str = records[i].RecordToString();
|
||||||
|
var s = str.Split(' ');
|
||||||
|
if (s.Length == 1)
|
||||||
|
{
|
||||||
|
rec[i] = s[0];
|
||||||
|
} else if (s.Length == 2)
|
||||||
|
{
|
||||||
|
rec[i] = s[1];
|
||||||
|
} else
|
||||||
|
{
|
||||||
|
rec[i] = null;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return rec;
|
||||||
|
/*
|
||||||
|
foreach (var r in result.AllRecords)
|
||||||
|
{
|
||||||
|
Console.WriteLine(r.RecordToString());
|
||||||
|
}*/
|
||||||
|
}
|
||||||
|
|
||||||
|
public static async System.Threading.Tasks.Task<string[]> GetIPAddressFromDnsArrayAsync(string[] dnsnames)
|
||||||
|
{
|
||||||
|
var ips = new string[dnsnames.Length];
|
||||||
|
for(int i = 0; i < dnsnames.Length; i++)
|
||||||
|
{
|
||||||
|
ips[i] = await GetIpFromDnsNameAsync(dnsnames[i]);
|
||||||
|
}
|
||||||
|
|
||||||
|
return ips;
|
||||||
|
}
|
||||||
|
|
||||||
|
public static async System.Threading.Tasks.Task<string> GetIpFromDnsNameAsync(string dnsname)
|
||||||
|
{
|
||||||
|
var lookup = new LookupClient();
|
||||||
|
var result = await lookup.QueryAsync(dnsname, QueryType.A);
|
||||||
|
|
||||||
|
var records = result.AllRecords.ToArray();
|
||||||
|
|
||||||
|
if (records.Length < 1) return null;
|
||||||
|
return records[0].RecordToString();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
20
MailServer/MailServer/GlobalSuppressions.cs
Normal file
20
MailServer/MailServer/GlobalSuppressions.cs
Normal file
@ -0,0 +1,20 @@
|
|||||||
|
|
||||||
|
// This file is used by Code Analysis to maintain SuppressMessage
|
||||||
|
// attributes that are applied to this project.
|
||||||
|
// Project-level suppressions either have no target or are given
|
||||||
|
// a specific target and scoped to a namespace, type, member, etc.
|
||||||
|
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._Count")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._Mail")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._QueueEntered")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._DestinationIps")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._DestinationDnsNames")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._From")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._To")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._Subject")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._Others")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._Date")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._MessageId")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.Mail._MIME_Version")]
|
||||||
|
[assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Stil", "IDE1006:Benennungsstile", Justification = "<Ausstehend>", Scope = "member", Target = "~P:SMTPServer.MailQueue.QueueMail._DestinationIndex")]
|
||||||
|
|
@ -1,7 +1,7 @@
|
|||||||
using System;
|
using System;
|
||||||
|
|
||||||
namespace Logging
|
//namespace Logging
|
||||||
{
|
//{
|
||||||
public class Logging
|
public class Logging
|
||||||
{
|
{
|
||||||
private static LoggingType[] _ActiveLoggingTypes { get; set; }
|
private static LoggingType[] _ActiveLoggingTypes { get; set; }
|
||||||
@ -16,15 +16,18 @@ namespace Logging
|
|||||||
ALL
|
ALL
|
||||||
}
|
}
|
||||||
|
|
||||||
|
public static void AddLogMessage(LoggingType messagetype, string message)
|
||||||
|
|
||||||
private static void AddLogMessage(LoggingType messagetype, string message)
|
|
||||||
{
|
{
|
||||||
if(CheckLoggingType(messagetype)) PrintToConsole(messagetype, message);
|
if(CheckLoggingType(messagetype)) PrintToConsole(messagetype, message);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
public static void AddException(Exception e)
|
||||||
|
{
|
||||||
|
AddLogMessage(LoggingType.ERROR, e.Message);
|
||||||
|
}
|
||||||
|
|
||||||
private static bool CheckLoggingType(LoggingType lt){
|
private static bool CheckLoggingType(LoggingType lt){
|
||||||
if (_ActiveLoggingTypes.Length < 1) {
|
if (_ActiveLoggingTypes == null ||_ActiveLoggingTypes.Length < 1) {
|
||||||
_ActiveLoggingTypes = new LoggingType[1];
|
_ActiveLoggingTypes = new LoggingType[1];
|
||||||
_ActiveLoggingTypes[0] = LoggingType.ALL;
|
_ActiveLoggingTypes[0] = LoggingType.ALL;
|
||||||
}
|
}
|
||||||
@ -47,4 +50,4 @@ namespace Logging
|
|||||||
Console.WriteLine("[" + lt.ToString() + "]" + message);
|
Console.WriteLine("[" + lt.ToString() + "]" + message);
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
//}
|
109
MailServer/MailServer/MTACommands.cs
Normal file
109
MailServer/MailServer/MTACommands.cs
Normal file
@ -0,0 +1,109 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.IO;
|
||||||
|
using System.Linq;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public class MTACommandsDict : Dictionary<MTACommands, String>
|
||||||
|
{
|
||||||
|
public MTACommandsDict()
|
||||||
|
{
|
||||||
|
Add(MTACommands.HELO, "HELO");
|
||||||
|
Add(MTACommands.DATA, "DATA");
|
||||||
|
Add(MTACommands.EXPN, "EXPN");
|
||||||
|
Add(MTACommands.HELP, "HELP");
|
||||||
|
Add(MTACommands.MAIL_FROM, "MAIL FROM");
|
||||||
|
Add(MTACommands.NOOP, "NOOP");
|
||||||
|
Add(MTACommands.QUIT, "QUIT");
|
||||||
|
Add(MTACommands.RCPT_TO, "RCPT TO");
|
||||||
|
Add(MTACommands.RSET, "RSET");
|
||||||
|
Add(MTACommands.SAML_FROM, "SAML FROM");
|
||||||
|
Add(MTACommands.SEND_FROM, "SEND FROM");
|
||||||
|
Add(MTACommands.SOML_FROM, "SOML FROM");
|
||||||
|
Add(MTACommands.TURN, "TURN");
|
||||||
|
Add(MTACommands.VERB, "VERB");
|
||||||
|
Add(MTACommands.VRFY, "VRFY");
|
||||||
|
Add(MTACommands.ATRN, "ATRN");
|
||||||
|
Add(MTACommands.AUTH, "AUTH");
|
||||||
|
Add(MTACommands.BDAT, "BDAT");
|
||||||
|
Add(MTACommands.EHLO, "EHLO");
|
||||||
|
Add(MTACommands.ETRN, "ETRN");
|
||||||
|
Add(MTACommands.RCPT, "RCPT");
|
||||||
|
Add(MTACommands.SAML, "SAML");
|
||||||
|
Add(MTACommands.SEND, "SEND");
|
||||||
|
Add(MTACommands.SOML, "SOML");
|
||||||
|
Add(MTACommands.STARTTL, "STARTTLs");
|
||||||
|
Add(MTACommands.AUTH_LOGIN, "AUTH LOGIN");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public enum MTACommands
|
||||||
|
{
|
||||||
|
HELO,
|
||||||
|
MAIL_FROM,
|
||||||
|
RCPT_TO,
|
||||||
|
DATA,
|
||||||
|
RSET,
|
||||||
|
QUIT,
|
||||||
|
HELP,
|
||||||
|
VRFY,
|
||||||
|
EXPN,
|
||||||
|
VERB,
|
||||||
|
NOOP,
|
||||||
|
TURN,
|
||||||
|
SEND_FROM,
|
||||||
|
SOML_FROM,
|
||||||
|
SAML_FROM,
|
||||||
|
ATRN,
|
||||||
|
AUTH,
|
||||||
|
BDAT,
|
||||||
|
EHLO,
|
||||||
|
ETRN,
|
||||||
|
RCPT,
|
||||||
|
SAML,
|
||||||
|
SEND,
|
||||||
|
SOML,
|
||||||
|
STARTTL,
|
||||||
|
AUTH_LOGIN
|
||||||
|
}
|
||||||
|
|
||||||
|
public enum ResponseCodes
|
||||||
|
{
|
||||||
|
C211 = 211,
|
||||||
|
C214 = 214,
|
||||||
|
C220 = 220,
|
||||||
|
C221 = 221,
|
||||||
|
C250 = 250,
|
||||||
|
C251 = 251,
|
||||||
|
C252 = 252,
|
||||||
|
C253 = 253,
|
||||||
|
C334 = 334,
|
||||||
|
C354 = 354,
|
||||||
|
C355 = 355,
|
||||||
|
C421 = 421,
|
||||||
|
C432 = 432,
|
||||||
|
C450 = 450,
|
||||||
|
C451 = 451,
|
||||||
|
C452 = 452,
|
||||||
|
C453 = 453,
|
||||||
|
C454 = 454,
|
||||||
|
C458 = 458,
|
||||||
|
C459 = 459,
|
||||||
|
C500 = 500,
|
||||||
|
C501 = 501,
|
||||||
|
C502 = 502,
|
||||||
|
C503 = 503,
|
||||||
|
C504 = 504,
|
||||||
|
C521 = 521,
|
||||||
|
C530 = 530,
|
||||||
|
C534 = 534,
|
||||||
|
C538 = 538,
|
||||||
|
C550 = 550,
|
||||||
|
C551 = 551,
|
||||||
|
C552 = 552,
|
||||||
|
C553 = 553,
|
||||||
|
C554 = 554
|
||||||
|
}
|
||||||
|
}
|
86
MailServer/MailServer/MTASession.cs
Normal file
86
MailServer/MailServer/MTASession.cs
Normal file
@ -0,0 +1,86 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Text;
|
||||||
|
using System.Threading;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
class MTASession
|
||||||
|
{
|
||||||
|
private static MTACommandsDict MTACommandsDict = new MTACommandsDict();
|
||||||
|
private ConnectedEventArgs ConnectedEventArgs { get; set; }
|
||||||
|
|
||||||
|
private bool Initialized { get; set; }
|
||||||
|
private string SenderHostname { get; set; }
|
||||||
|
|
||||||
|
private bool AuthActive { get; set; }
|
||||||
|
private string Username { get; set; }
|
||||||
|
private string Password { get; set; }
|
||||||
|
private bool Authenticated { get; set; }
|
||||||
|
|
||||||
|
private bool DATA { get; set; }
|
||||||
|
|
||||||
|
private string Mail_From { get; set; }
|
||||||
|
|
||||||
|
public MTASession(ConnectedEventArgs e)
|
||||||
|
{
|
||||||
|
ConnectedEventArgs = e;
|
||||||
|
Thread th = new Thread(new ThreadStart(StartCommunication));
|
||||||
|
th.Start();
|
||||||
|
}
|
||||||
|
|
||||||
|
private void StartCommunication()
|
||||||
|
{
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C220, MailTransferAgent.Hostname);
|
||||||
|
ConnectedEventArgs.NewLine += ConnectedEventArgs_NewLine;
|
||||||
|
}
|
||||||
|
|
||||||
|
private void ConnectedEventArgs_NewLine(string line)
|
||||||
|
{
|
||||||
|
if (line.StartsWith(MTACommandsDict[MTACommands.RSET]))
|
||||||
|
{
|
||||||
|
// Schauen was alles resettet wird
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!Initialized)
|
||||||
|
{
|
||||||
|
if (line.StartsWith(MTACommandsDict[MTACommands.HELO]))
|
||||||
|
{
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C250, MailTransferAgent.Hostname);
|
||||||
|
//} else if (line.StartsWith(MTACommandsDict[MTACommands.EHLO])) {
|
||||||
|
// ConnectedEventArgs.SendResponse(ResponseCodes.C250, MailTransferAgent.Hostname);
|
||||||
|
}
|
||||||
|
else
|
||||||
|
{
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C503, MailTransferAgent.Hostname);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
Initialized = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (line.StartsWith(MTACommandsDict[MTACommands.AUTH_LOGIN]))
|
||||||
|
{
|
||||||
|
AuthActive = true;
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C334);
|
||||||
|
}
|
||||||
|
else if (line.StartsWith(MTACommandsDict[MTACommands.MAIL_FROM]))
|
||||||
|
{
|
||||||
|
var args = line.Split(':');
|
||||||
|
if (args.Length < 2)
|
||||||
|
{
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C501);
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
var mailFrom = args[1];
|
||||||
|
mailFrom.Replace('<', ' ');
|
||||||
|
}
|
||||||
|
else if (line.StartsWith(MTACommandsDict[MTACommands.QUIT]))
|
||||||
|
{
|
||||||
|
//throw new NotImplementedException();
|
||||||
|
} else
|
||||||
|
{
|
||||||
|
ConnectedEventArgs.SendResponse(ResponseCodes.C500);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
31
MailServer/MailServer/Mail.cs
Normal file
31
MailServer/MailServer/Mail.cs
Normal file
@ -0,0 +1,31 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Text;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public class Mail
|
||||||
|
{
|
||||||
|
public string To { get; private set; }
|
||||||
|
public string From { get; private set; }
|
||||||
|
|
||||||
|
public string Subject { get; private set; }
|
||||||
|
public string MessageId { get; private set; }
|
||||||
|
public string Date { get; private set; }
|
||||||
|
|
||||||
|
public string MIME_Version { get; private set; }
|
||||||
|
|
||||||
|
public string Others { get; private set; }
|
||||||
|
|
||||||
|
|
||||||
|
public Mail(string mail)
|
||||||
|
{
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
public string GetSenderDomain()
|
||||||
|
{
|
||||||
|
return From.Split('@')[1];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
87
MailServer/MailServer/MailQueue.cs
Normal file
87
MailServer/MailServer/MailQueue.cs
Normal file
@ -0,0 +1,87 @@
|
|||||||
|
using DnsClient;
|
||||||
|
using SMTPServer.Exceptions;
|
||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public class MailQueue
|
||||||
|
{
|
||||||
|
private static List<QueueMail> Mails = null;
|
||||||
|
|
||||||
|
public static async void AddToMesssageQueueAsync(Mail mail)
|
||||||
|
{
|
||||||
|
var qmail = new QueueMail(mail);
|
||||||
|
|
||||||
|
qmail.DestinationDnsNames = await GetDNSEntries.GetMXRecordAsync(mail.GetSenderDomain());
|
||||||
|
qmail.DestinationIps = await GetDNSEntries.GetIPAddressFromDnsArrayAsync(qmail.DestinationDnsNames);
|
||||||
|
|
||||||
|
lock (Mails)
|
||||||
|
{
|
||||||
|
if (Mails == null)
|
||||||
|
{
|
||||||
|
Mails = new List<QueueMail>();
|
||||||
|
}
|
||||||
|
Mails.Add(qmail);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static QueueMail GetNextMail()
|
||||||
|
{
|
||||||
|
lock (Mails)
|
||||||
|
{
|
||||||
|
if(Mails.Count < 1)
|
||||||
|
{
|
||||||
|
throw new NoMailsInQueueException();
|
||||||
|
}
|
||||||
|
|
||||||
|
var m = Mails[0];
|
||||||
|
|
||||||
|
Mails.Remove(m);
|
||||||
|
m.Count++;
|
||||||
|
Mails.Add(m);
|
||||||
|
|
||||||
|
return m;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void RemoveMailFromQueue(QueueMail mail)
|
||||||
|
{
|
||||||
|
lock (Mails)
|
||||||
|
{
|
||||||
|
Mails.Remove(mail);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public class QueueMail
|
||||||
|
{
|
||||||
|
public DateTime QueueEntered { get; private set; }
|
||||||
|
public int Count { get; set; }
|
||||||
|
public Mail Mail { get; private set; }
|
||||||
|
public string[] DestinationIps { get; set; }
|
||||||
|
public string[] DestinationDnsNames { get; set; }
|
||||||
|
public int DestinationIndex { get; set; }
|
||||||
|
|
||||||
|
public QueueMail (Mail mail)
|
||||||
|
{
|
||||||
|
Mail = mail;
|
||||||
|
QueueEntered = DateTime.Now;
|
||||||
|
Count = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
public byte[] GetIpBytes() => GetIpBytes(DestinationIndex);
|
||||||
|
|
||||||
|
public byte[] GetIpBytes(int index)
|
||||||
|
{
|
||||||
|
var parts = DestinationIps[index].Split('.');
|
||||||
|
var bytes = new byte[parts.Length];
|
||||||
|
for(int i = 0; i < parts.Length; i++)
|
||||||
|
{
|
||||||
|
bytes[i] = byte.Parse(parts[i]);
|
||||||
|
}
|
||||||
|
|
||||||
|
return bytes;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
@ -1,7 +1,8 @@
|
|||||||
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
||||||
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
|
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
|
||||||
<PropertyGroup Label="Configuration">
|
<PropertyGroup Label="Configuration">
|
||||||
<NoWarn>1701;1702;1705;1006</NoWarn>
|
<NoWarn>1701;1702;1705;1006</NoWarn>
|
||||||
|
<PlatformTarget>AnyCPU</PlatformTarget>
|
||||||
</PropertyGroup>
|
</PropertyGroup>
|
||||||
<PropertyGroup>
|
<PropertyGroup>
|
||||||
<OutputType>Exe</OutputType>
|
<OutputType>Exe</OutputType>
|
||||||
@ -12,6 +13,25 @@
|
|||||||
<EmbeddedResource Include="**\*.resx" />
|
<EmbeddedResource Include="**\*.resx" />
|
||||||
</ItemGroup>
|
</ItemGroup>
|
||||||
<ItemGroup>
|
<ItemGroup>
|
||||||
|
<Compile Remove="DNSClient\**" />
|
||||||
|
<Compile Remove="DNS\**" />
|
||||||
|
<EmbeddedResource Remove="DNSClient\**" />
|
||||||
|
<EmbeddedResource Remove="DNS\**" />
|
||||||
|
</ItemGroup>
|
||||||
|
<ItemGroup />
|
||||||
|
<ItemGroup>
|
||||||
|
<PackageReference Include="DnsClient">
|
||||||
|
<Version>1.0.0-beta-1011</Version>
|
||||||
|
</PackageReference>
|
||||||
|
<PackageReference Include="Microsoft.DotNet.Cli.Utils">
|
||||||
|
<Version>1.0.0-preview2-1-003177</Version>
|
||||||
|
</PackageReference>
|
||||||
|
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools">
|
||||||
|
<Version>1.1.0-preview4-final</Version>
|
||||||
|
</PackageReference>
|
||||||
|
<PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet">
|
||||||
|
<Version>1.1.0-preview4-final</Version>
|
||||||
|
</PackageReference>
|
||||||
<PackageReference Include="Microsoft.NETCore">
|
<PackageReference Include="Microsoft.NETCore">
|
||||||
<Version>5.0.2</Version>
|
<Version>5.0.2</Version>
|
||||||
</PackageReference>
|
</PackageReference>
|
||||||
@ -31,6 +51,12 @@
|
|||||||
<PackageReference Include="Microsoft.NETCore.Targets">
|
<PackageReference Include="Microsoft.NETCore.Targets">
|
||||||
<Version>1.1.0</Version>
|
<Version>1.1.0</Version>
|
||||||
</PackageReference>
|
</PackageReference>
|
||||||
|
<PackageReference Include="Pomelo.EntityFrameworkCore.MySql">
|
||||||
|
<Version>1.1.0-rtm-10012</Version>
|
||||||
|
</PackageReference>
|
||||||
|
<PackageReference Include="Pomelo.EntityFrameworkCore.MySql.Design">
|
||||||
|
<Version>1.1.0-rtm-10012</Version>
|
||||||
|
</PackageReference>
|
||||||
<PackageReference Include="System.IO.FileSystem">
|
<PackageReference Include="System.IO.FileSystem">
|
||||||
<Version>4.0.1</Version>
|
<Version>4.0.1</Version>
|
||||||
</PackageReference>
|
</PackageReference>
|
||||||
@ -38,5 +64,6 @@
|
|||||||
<Version>4.3.0</Version>
|
<Version>4.3.0</Version>
|
||||||
</PackageReference>
|
</PackageReference>
|
||||||
</ItemGroup>
|
</ItemGroup>
|
||||||
|
<ItemGroup />
|
||||||
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
|
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
|
||||||
</Project>
|
</Project>
|
67
MailServer/MailServer/MailTransferAgent.cs
Normal file
67
MailServer/MailServer/MailTransferAgent.cs
Normal file
@ -0,0 +1,67 @@
|
|||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Text;
|
||||||
|
using System.Threading;
|
||||||
|
using SMTPServer.Exceptions;
|
||||||
|
using System.Net;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
class MailTransferAgent
|
||||||
|
{
|
||||||
|
public const string Hostname = "mail.fstamm.net";
|
||||||
|
private static MTACommandsDict MTACommandsDict = new MTACommandsDict();
|
||||||
|
private static Thread Thread;
|
||||||
|
private static List<MTASession> Sessions { get; set; }
|
||||||
|
|
||||||
|
public static void StartMailTransferAgent()
|
||||||
|
{
|
||||||
|
Thread = new Thread(new ThreadStart(MTA));
|
||||||
|
Thread.Start();
|
||||||
|
|
||||||
|
var portListener = new PortListener(25);
|
||||||
|
portListener.OnConnected += PortListener_OnConnected;
|
||||||
|
}
|
||||||
|
|
||||||
|
private static void PortListener_OnConnected(object source, ConnectedEventArgs e)
|
||||||
|
{
|
||||||
|
var session = new MTASession(e);
|
||||||
|
lock (Sessions)
|
||||||
|
{
|
||||||
|
Sessions.Add(session);
|
||||||
|
}
|
||||||
|
//throw new NotImplementedException();
|
||||||
|
}
|
||||||
|
|
||||||
|
public static void MTA()
|
||||||
|
{
|
||||||
|
while (true)
|
||||||
|
{
|
||||||
|
MailQueue.QueueMail mail = null;
|
||||||
|
try
|
||||||
|
{
|
||||||
|
MailQueue.GetNextMail();
|
||||||
|
}
|
||||||
|
catch (NoMailsInQueueException)
|
||||||
|
{
|
||||||
|
Thread.Sleep(100);
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
var charset = Encoding.UTF8;
|
||||||
|
var client = new StartTcpConnection(25, new IPAddress(mail.GetIpBytes()), charset);
|
||||||
|
|
||||||
|
if (!client.Connected) ; //ToDo Errorfall
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public static string WaitForResponseCode(ResponseCodes code)
|
||||||
|
{
|
||||||
|
|
||||||
|
return null;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
125
MailServer/MailServer/PortListener.cs
Normal file
125
MailServer/MailServer/PortListener.cs
Normal file
@ -0,0 +1,125 @@
|
|||||||
|
using SMTPServer.Exceptions;
|
||||||
|
using System;
|
||||||
|
using System.Collections.Generic;
|
||||||
|
using System.Net;
|
||||||
|
using System.Net.Sockets;
|
||||||
|
using System.Text;
|
||||||
|
using System.Threading;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
public delegate void ConnectedEventHandler(object source, ConnectedEventArgs e);
|
||||||
|
|
||||||
|
public class ConnectedEventArgs : EventArgs
|
||||||
|
{
|
||||||
|
public delegate void ReceivedLineEventHandler(string line);
|
||||||
|
|
||||||
|
public event ReceivedLineEventHandler NewLine;
|
||||||
|
|
||||||
|
private Encoding Encoding { get; set; }
|
||||||
|
private string Others { get; set; }
|
||||||
|
public TcpClient Client { get; private set; }
|
||||||
|
|
||||||
|
private NetworkStream Stream { get; set; }
|
||||||
|
public ConnectedEventArgs(TcpClient client, Encoding encoding)
|
||||||
|
{
|
||||||
|
Client = client;
|
||||||
|
Encoding = encoding;
|
||||||
|
Stream = client.GetStream();
|
||||||
|
}
|
||||||
|
|
||||||
|
public void SendResponse(ResponseCodes responseCode) => SendResponse(responseCode, "");
|
||||||
|
|
||||||
|
public void SendResponse (ResponseCodes responseCode, string args)
|
||||||
|
{
|
||||||
|
var text = ((int)responseCode).ToString();
|
||||||
|
text += " " + args;
|
||||||
|
var bytes = Encoding.UTF8.GetBytes(text);
|
||||||
|
Stream.Write(bytes, 0 , bytes.Length);
|
||||||
|
}
|
||||||
|
|
||||||
|
private void ReadClientInput()
|
||||||
|
{
|
||||||
|
while (true)
|
||||||
|
{
|
||||||
|
if (Stream.DataAvailable)
|
||||||
|
{
|
||||||
|
byte[] buffer = new byte[Client.ReceiveBufferSize];
|
||||||
|
Stream.Read(buffer, 0, buffer.Length);
|
||||||
|
|
||||||
|
var str = Encoding.GetString(buffer);
|
||||||
|
lock (Others)
|
||||||
|
{
|
||||||
|
Others += str;
|
||||||
|
}
|
||||||
|
|
||||||
|
CheckLines();
|
||||||
|
} else
|
||||||
|
{
|
||||||
|
Thread.Sleep(10);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private void CheckLines()
|
||||||
|
{
|
||||||
|
lock (Others)
|
||||||
|
{
|
||||||
|
var line = "";
|
||||||
|
foreach (char c in Others)
|
||||||
|
{
|
||||||
|
if (c.Equals('\n'))
|
||||||
|
{
|
||||||
|
Console.WriteLine(line);
|
||||||
|
NewLine(line);
|
||||||
|
line = "";
|
||||||
|
}
|
||||||
|
else line += c;
|
||||||
|
}
|
||||||
|
Others = line;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
public class PortListener
|
||||||
|
{
|
||||||
|
static List<int> _Ports = null;
|
||||||
|
TcpListener _Listener;
|
||||||
|
|
||||||
|
public event ConnectedEventHandler OnConnected;
|
||||||
|
|
||||||
|
public PortListener(int port)
|
||||||
|
{
|
||||||
|
if(_Ports == null)
|
||||||
|
{
|
||||||
|
_Ports = new List<int>();
|
||||||
|
}
|
||||||
|
|
||||||
|
foreach(var i in _Ports)
|
||||||
|
{
|
||||||
|
if (i == port)
|
||||||
|
{
|
||||||
|
throw new PortUsedException();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
_Ports.Add(port);
|
||||||
|
StartListening(new TcpListener(IPAddress.Any, port));
|
||||||
|
}
|
||||||
|
|
||||||
|
private void StartListening(TcpListener listener)
|
||||||
|
{
|
||||||
|
listener.Start();
|
||||||
|
_Listener = listener;
|
||||||
|
Thread thread = new Thread(new ThreadStart(ListenerAsync));
|
||||||
|
thread.Start();
|
||||||
|
}
|
||||||
|
|
||||||
|
private async void ListenerAsync()
|
||||||
|
{
|
||||||
|
var client = await _Listener.AcceptTcpClientAsync();
|
||||||
|
Console.WriteLine("Connection");
|
||||||
|
OnConnected(this, new ConnectedEventArgs(client, Encoding.UTF8));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
119
MailServer/MailServer/Program.cs
Normal file
119
MailServer/MailServer/Program.cs
Normal file
@ -0,0 +1,119 @@
|
|||||||
|
using DnsClient;
|
||||||
|
using System;
|
||||||
|
using System.Threading;
|
||||||
|
using System.Threading.Tasks;
|
||||||
|
|
||||||
|
namespace SMTPServer
|
||||||
|
{
|
||||||
|
class Program
|
||||||
|
{
|
||||||
|
static void Main(string[] args)
|
||||||
|
{
|
||||||
|
/*using (var context = new MysqlDB())
|
||||||
|
{
|
||||||
|
context.Database.EnsureCreated();
|
||||||
|
|
||||||
|
var domain = new Domains()
|
||||||
|
{
|
||||||
|
Domain = "HI",
|
||||||
|
IsMail = true
|
||||||
|
};
|
||||||
|
context.Add(domain);
|
||||||
|
context.SaveChanges();
|
||||||
|
|
||||||
|
var res = context.Domains.Find();
|
||||||
|
}*/
|
||||||
|
|
||||||
|
|
||||||
|
//Console.WriteLine("####################");
|
||||||
|
|
||||||
|
/*var request = new DnsQueryRequest();
|
||||||
|
var response = request.ResolveAsync("fabianstamm.de", DnDns.Enums.NsType.MX, DnDns.Enums.NsClass.ANY, System.Net.Sockets.ProtocolType.Tcp);
|
||||||
|
|
||||||
|
OutputResults(response);*/
|
||||||
|
//var t = new Thread(new ThreadStart(Test));
|
||||||
|
//t.Start();
|
||||||
|
//TestAsync();
|
||||||
|
|
||||||
|
var listener = new PortListener(5122);
|
||||||
|
listener.OnConnected += Listener_OnConnected;
|
||||||
|
|
||||||
|
while (true)
|
||||||
|
{
|
||||||
|
Thread.Sleep(500);
|
||||||
|
|
||||||
|
}
|
||||||
|
//var listener = new PortListener(5122);
|
||||||
|
//listener.OnConnected += Listener_OnConnected;
|
||||||
|
}
|
||||||
|
|
||||||
|
private static async void TestAsync()
|
||||||
|
{
|
||||||
|
var lookup = new LookupClient();
|
||||||
|
var result = await lookup.QueryAsync("fabianstamm.de.", QueryType.MX);
|
||||||
|
|
||||||
|
foreach (var r in result.AllRecords)
|
||||||
|
{
|
||||||
|
Console.WriteLine(r.RecordToString());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private static void Listener_OnConnected(object source, ConnectedEventArgs e)
|
||||||
|
{
|
||||||
|
var session = new MTASession(e);
|
||||||
|
//throw new NotImplementedException();
|
||||||
|
}
|
||||||
|
/*
|
||||||
|
private static async void OutputResults(Task<DnDns.Query.DnsQueryResponse> res)
|
||||||
|
{
|
||||||
|
OutputResults(await res);
|
||||||
|
}
|
||||||
|
|
||||||
|
private static void OutputResults(DnDns.Query.DnsQueryResponse response)
|
||||||
|
{
|
||||||
|
Console.WriteLine("Bytes received: " + response.BytesReceived);
|
||||||
|
|
||||||
|
Console.WriteLine("Name: " + response.Name);
|
||||||
|
Console.WriteLine("OpCode: " + response.NsClass);
|
||||||
|
Console.WriteLine("NsFlags: " + response.NsFlags);
|
||||||
|
Console.WriteLine("NsType: " + response.NsType);
|
||||||
|
Console.WriteLine("RCode: " + response.RCode);
|
||||||
|
Console.WriteLine("OpCode: " + response.OpCode);
|
||||||
|
|
||||||
|
// Enumerate the Answer Records
|
||||||
|
Console.WriteLine("Answers:");
|
||||||
|
foreach (IDnsRecord record in response.Answers)
|
||||||
|
{
|
||||||
|
Console.WriteLine(record.Answer);
|
||||||
|
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
|
||||||
|
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
|
||||||
|
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
|
||||||
|
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
|
||||||
|
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
|
||||||
|
Console.WriteLine();
|
||||||
|
}
|
||||||
|
|
||||||
|
foreach (IDnsRecord record in response.AuthoritiveNameServers)
|
||||||
|
{
|
||||||
|
Console.WriteLine(record.Answer);
|
||||||
|
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
|
||||||
|
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
|
||||||
|
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
|
||||||
|
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
|
||||||
|
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
|
||||||
|
Console.WriteLine();
|
||||||
|
}
|
||||||
|
|
||||||
|
foreach (IDnsRecord record in response.AdditionalRRecords)
|
||||||
|
{
|
||||||
|
Console.WriteLine(record.Answer);
|
||||||
|
Console.WriteLine(" |--- RDATA Field Length: " + record.DnsHeader.DataLength);
|
||||||
|
Console.WriteLine(" |--- Name: " + record.DnsHeader.Name);
|
||||||
|
Console.WriteLine(" |--- NS Class: " + record.DnsHeader.NsClass);
|
||||||
|
Console.WriteLine(" |--- NS Type: " + record.DnsHeader.NsType);
|
||||||
|
Console.WriteLine(" |--- TTL: " + record.DnsHeader.TimeToLive);
|
||||||
|
Console.WriteLine();
|
||||||
|
}
|
||||||
|
}*/
|
||||||
|
}
|
||||||
|
}
|
7
MailServer/MailServer/Properties/launchSettings.json
Normal file
7
MailServer/MailServer/Properties/launchSettings.json
Normal file
@ -0,0 +1,7 @@
|
|||||||
|
{
|
||||||
|
"profiles": {
|
||||||
|
"SMTPServer": {
|
||||||
|
"commandName": "Project"
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
@ -9,9 +9,15 @@ namespace SMTPServer
|
|||||||
{
|
{
|
||||||
class StartTcpConnection : Socket
|
class StartTcpConnection : Socket
|
||||||
{
|
{
|
||||||
private List<string> _Lines = new List<string>();
|
private List<string> Lines = new List<string>();
|
||||||
private string _Others { get; set; }
|
private int LinesAvailable { get
|
||||||
private Encoding _Encoding { get; set; }
|
{
|
||||||
|
return Lines.Count;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
private string Others { get; set; }
|
||||||
|
private Encoding Encoding { get; set; }
|
||||||
|
|
||||||
public StartTcpConnection(int port, IPAddress destination, Encoding encoding) : base (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
|
public StartTcpConnection(int port, IPAddress destination, Encoding encoding) : base (AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)
|
||||||
{
|
{
|
||||||
@ -23,13 +29,13 @@ namespace SMTPServer
|
|||||||
{
|
{
|
||||||
while (true)
|
while (true)
|
||||||
{
|
{
|
||||||
byte[] buffer = new byte[this.ReceiveBufferSize];
|
byte[] buffer = new byte[ReceiveBufferSize];
|
||||||
Receive(buffer);
|
Receive(buffer);
|
||||||
|
|
||||||
var str = _Encoding.GetString(buffer);
|
var str = Encoding.GetString(buffer);
|
||||||
lock (_Others)
|
lock (Others)
|
||||||
{
|
{
|
||||||
_Others += str;
|
Others += str;
|
||||||
}
|
}
|
||||||
|
|
||||||
CheckLines();
|
CheckLines();
|
||||||
@ -38,30 +44,30 @@ namespace SMTPServer
|
|||||||
|
|
||||||
private void CheckLines()
|
private void CheckLines()
|
||||||
{
|
{
|
||||||
lock (_Others)
|
lock (Others)
|
||||||
{
|
{
|
||||||
var line = "";
|
var line = "";
|
||||||
foreach (char c in _Others)
|
foreach (char c in Others)
|
||||||
{
|
{
|
||||||
if (c.Equals('\n'))
|
if (c.Equals('\n'))
|
||||||
{
|
{
|
||||||
lock (_Lines)
|
lock (Lines)
|
||||||
{
|
{
|
||||||
_Lines.Add(line);
|
Lines.Add(line);
|
||||||
line = "";
|
line = "";
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
else line += c;
|
else line += c;
|
||||||
}
|
}
|
||||||
_Others = line;
|
Others = line;
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
public string GetLine()
|
public string GetLine()
|
||||||
{
|
{
|
||||||
lock (_Lines)
|
lock (Lines)
|
||||||
{
|
{
|
||||||
return _Lines[0];
|
return Lines[0];
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
@ -1,9 +0,0 @@
|
|||||||
using System;
|
|
||||||
|
|
||||||
class Program
|
|
||||||
{
|
|
||||||
static void Main(string[] args)
|
|
||||||
{
|
|
||||||
Console.WriteLine("Hello World!");
|
|
||||||
}
|
|
||||||
}
|
|
@ -1,25 +0,0 @@
|
|||||||
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
|
||||||
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
|
|
||||||
|
|
||||||
<PropertyGroup>
|
|
||||||
<OutputType>Exe</OutputType>
|
|
||||||
<TargetFramework>netcoreapp1.0</TargetFramework>
|
|
||||||
</PropertyGroup>
|
|
||||||
|
|
||||||
<ItemGroup>
|
|
||||||
<Compile Include="**\*.cs" />
|
|
||||||
<EmbeddedResource Include="**\*.resx" />
|
|
||||||
</ItemGroup>
|
|
||||||
|
|
||||||
<ItemGroup>
|
|
||||||
<PackageReference Include="Microsoft.NETCore.App">
|
|
||||||
<Version>1.0.1</Version>
|
|
||||||
</PackageReference>
|
|
||||||
<PackageReference Include="Microsoft.NET.Sdk">
|
|
||||||
<Version>1.0.0-alpha-20161104-2</Version>
|
|
||||||
<PrivateAssets>All</PrivateAssets>
|
|
||||||
</PackageReference>
|
|
||||||
</ItemGroup>
|
|
||||||
|
|
||||||
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
|
|
||||||
</Project>
|
|
@ -1,24 +0,0 @@
|
|||||||
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
|
||||||
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
|
|
||||||
<PropertyGroup Label="Configuration">
|
|
||||||
<NoWarn>1701;1702;1705;1006</NoWarn>
|
|
||||||
</PropertyGroup>
|
|
||||||
<PropertyGroup>
|
|
||||||
<OutputType>Exe</OutputType>
|
|
||||||
<TargetFramework>netcoreapp1.0</TargetFramework>
|
|
||||||
</PropertyGroup>
|
|
||||||
<ItemGroup>
|
|
||||||
<Compile Include="**\*.cs" />
|
|
||||||
<EmbeddedResource Include="**\*.resx" />
|
|
||||||
</ItemGroup>
|
|
||||||
<ItemGroup>
|
|
||||||
<PackageReference Include="Microsoft.NETCore.App">
|
|
||||||
<Version>1.0.1</Version>
|
|
||||||
</PackageReference>
|
|
||||||
<PackageReference Include="Microsoft.NET.Sdk">
|
|
||||||
<Version>1.0.0-alpha-20161104-2</Version>
|
|
||||||
<PrivateAssets>All</PrivateAssets>
|
|
||||||
</PackageReference>
|
|
||||||
</ItemGroup>
|
|
||||||
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
|
|
||||||
</Project>
|
|
@ -1,115 +0,0 @@
|
|||||||
using System;
|
|
||||||
using System.Text;
|
|
||||||
|
|
||||||
namespace DNSResolver
|
|
||||||
{
|
|
||||||
internal static class DnsHelpers
|
|
||||||
{
|
|
||||||
private const long Epoch = 621355968000000000;
|
|
||||||
|
|
||||||
internal static byte[] CanonicaliseDnsName(string name, bool lowerCase)
|
|
||||||
{
|
|
||||||
if (!name.EndsWith("."))
|
|
||||||
{
|
|
||||||
name += ".";
|
|
||||||
}
|
|
||||||
|
|
||||||
if (name == ".")
|
|
||||||
{
|
|
||||||
return new byte[1];
|
|
||||||
}
|
|
||||||
|
|
||||||
StringBuilder sb = new StringBuilder();
|
|
||||||
|
|
||||||
sb.Append('\0');
|
|
||||||
|
|
||||||
for (int i = 0, j = 0; i < name.Length; i++, j++)
|
|
||||||
{
|
|
||||||
if (lowerCase)
|
|
||||||
{
|
|
||||||
sb.Append(char.ToLower(name[i]));
|
|
||||||
}
|
|
||||||
else
|
|
||||||
{
|
|
||||||
sb.Append(name[i]);
|
|
||||||
}
|
|
||||||
|
|
||||||
if (name[i] == '.')
|
|
||||||
{
|
|
||||||
sb[i - j] = (char)(j & 0xff);
|
|
||||||
j = -1;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
sb[sb.Length - 1] = '\0';
|
|
||||||
|
|
||||||
return Encoding.ASCII.GetBytes(sb.ToString());
|
|
||||||
}
|
|
||||||
|
|
||||||
internal static String DumpArrayToString(byte[] bytes)
|
|
||||||
{
|
|
||||||
StringBuilder builder = new StringBuilder();
|
|
||||||
|
|
||||||
builder.Append("[");
|
|
||||||
|
|
||||||
foreach (byte b in bytes)
|
|
||||||
{
|
|
||||||
builder.Append(" ");
|
|
||||||
builder.Append((sbyte)b);
|
|
||||||
builder.Append(" ");
|
|
||||||
}
|
|
||||||
|
|
||||||
builder.Append("]");
|
|
||||||
|
|
||||||
return builder.ToString();
|
|
||||||
}
|
|
||||||
|
|
||||||
/// <summary>
|
|
||||||
/// Converts a instance of a <see cref="DateTime"/> class to a 48 bit format time since epoch.
|
|
||||||
/// Epoch is defined as 1-Jan-70 UTC.
|
|
||||||
/// </summary>
|
|
||||||
/// <param name="dateTimeToConvert">The <see cref="DateTime"/> instance to convert to DNS format.</param>
|
|
||||||
/// <param name="timeHigh">The upper 16 bits of time.</param>
|
|
||||||
/// <param name="timeLow">The lower 32 bits of the time object.</param>
|
|
||||||
internal static void ConvertToDnsTime(DateTime dateTimeToConvert, out int timeHigh, out long timeLow)
|
|
||||||
{
|
|
||||||
long secondsFromEpoch = (dateTimeToConvert.ToUniversalTime().Ticks - Epoch) / 10000000;
|
|
||||||
timeHigh = (int)(secondsFromEpoch >> 32);
|
|
||||||
timeLow = (secondsFromEpoch & 0xFFFFFFFFL);
|
|
||||||
|
|
||||||
Logging.AddLogMessage(LoggingType.TRACE, "test");
|
|
||||||
Trace.WriteLine(String.Format("Date: {0}", dateTimeToConvert));
|
|
||||||
Trace.WriteLine(String.Format("secondsFromEpoch: {0}", secondsFromEpoch));
|
|
||||||
Trace.WriteLine(String.Format("timeHigh: {0}", timeHigh));
|
|
||||||
Trace.WriteLine(String.Format("timeLow: {0}", timeLow));
|
|
||||||
}
|
|
||||||
|
|
||||||
/// <summary>
|
|
||||||
/// Convert from DNS 48 but time format to a <see cref="DateTime"/> instance.
|
|
||||||
/// </summary>
|
|
||||||
/// <param name="timeHigh">The upper 16 bits of time.</param>
|
|
||||||
/// <param name="timeLow">The lower 32 bits of the time object.</param>
|
|
||||||
/// <returns>The converted date time</returns>
|
|
||||||
internal static DateTime ConvertFromDnsTime(long timeLow, long timeHigh)
|
|
||||||
{
|
|
||||||
long time = (timeHigh << 32) + timeLow;
|
|
||||||
time = time * 10000000;
|
|
||||||
time += Epoch;
|
|
||||||
|
|
||||||
return new DateTime(time);
|
|
||||||
}
|
|
||||||
|
|
||||||
/// <summary>
|
|
||||||
/// Convert from DNS 48 but time format to a <see cref="DateTime"/> instance.
|
|
||||||
/// </summary>
|
|
||||||
/// <param name="dnsTime">The upper 48 bits of time.</param>
|
|
||||||
/// <returns>The converted date time</returns>
|
|
||||||
internal static DateTime ConvertFromDnsTime(long dnsTime)
|
|
||||||
{
|
|
||||||
dnsTime = dnsTime * 10000000;
|
|
||||||
dnsTime += Epoch;
|
|
||||||
|
|
||||||
return new DateTime(dnsTime);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
@ -1,23 +0,0 @@
|
|||||||
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
|
|
||||||
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" />
|
|
||||||
<PropertyGroup Label="Configuration">
|
|
||||||
<NoWarn>1701;1702;1705;1006</NoWarn>
|
|
||||||
</PropertyGroup>
|
|
||||||
<PropertyGroup>
|
|
||||||
<TargetFramework>netstandard1.4</TargetFramework>
|
|
||||||
</PropertyGroup>
|
|
||||||
<ItemGroup>
|
|
||||||
<Compile Include="**\*.cs" />
|
|
||||||
<EmbeddedResource Include="**\*.resx" />
|
|
||||||
</ItemGroup>
|
|
||||||
<ItemGroup>
|
|
||||||
<PackageReference Include="NETStandard.Library">
|
|
||||||
<Version>1.6</Version>
|
|
||||||
</PackageReference>
|
|
||||||
<PackageReference Include="Microsoft.NET.Sdk">
|
|
||||||
<Version>1.0.0-alpha-20161104-2</Version>
|
|
||||||
<PrivateAssets>All</PrivateAssets>
|
|
||||||
</PackageReference>
|
|
||||||
</ItemGroup>
|
|
||||||
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
|
|
||||||
</Project>
|
|
@ -1,50 +0,0 @@
|
|||||||
using System;
|
|
||||||
|
|
||||||
namespace Logging
|
|
||||||
{
|
|
||||||
public class Logging
|
|
||||||
{
|
|
||||||
private static LoggingType[] _ActiveLoggingTypes { get; set; }
|
|
||||||
|
|
||||||
public enum LoggingType
|
|
||||||
{
|
|
||||||
TRACE,
|
|
||||||
ERROR,
|
|
||||||
DEBUG,
|
|
||||||
WARNING,
|
|
||||||
INFO,
|
|
||||||
ALL
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
private static void AddLogMessage(LoggingType messagetype, string message)
|
|
||||||
{
|
|
||||||
if(CheckLoggingType(messagetype)) PrintToConsole(messagetype, message);
|
|
||||||
}
|
|
||||||
|
|
||||||
private static bool CheckLoggingType(LoggingType lt){
|
|
||||||
if (_ActiveLoggingTypes.Length < 1) {
|
|
||||||
_ActiveLoggingTypes = new LoggingType[1];
|
|
||||||
_ActiveLoggingTypes[0] = LoggingType.ALL;
|
|
||||||
}
|
|
||||||
bool found = false;
|
|
||||||
foreach(LoggingType l in _ActiveLoggingTypes)
|
|
||||||
{
|
|
||||||
if (l == lt || l == LoggingType.ALL)
|
|
||||||
{
|
|
||||||
found = true;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
return found;
|
|
||||||
}
|
|
||||||
|
|
||||||
private static void PrintToConsole(LoggingType lt, string message)
|
|
||||||
{
|
|
||||||
Console.WriteLine("[" + lt.ToString() + "]" + message);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
@ -1,49 +0,0 @@
|
|||||||
using System;
|
|
||||||
using System.Collections.Generic;
|
|
||||||
using System.IO;
|
|
||||||
using System.Linq;
|
|
||||||
using System.Text;
|
|
||||||
|
|
||||||
namespace SMTPServer
|
|
||||||
{
|
|
||||||
public class MTACommandsDict : Dictionary<MTACommands, String>
|
|
||||||
{
|
|
||||||
public MTACommandsDict()
|
|
||||||
{
|
|
||||||
Add(MTACommands.HELO, "HELO");
|
|
||||||
Add(MTACommands.DATA, "DATA");
|
|
||||||
Add(MTACommands.EXPN, "EXPN");
|
|
||||||
Add(MTACommands.HELP, "HELP");
|
|
||||||
Add(MTACommands.MAIL_FROM, "MAIL FROM");
|
|
||||||
Add(MTACommands.NOOP, "NOOP");
|
|
||||||
Add(MTACommands.QUIT, "QUIT");
|
|
||||||
Add(MTACommands.RCPT_TO, "RCPT TO");
|
|
||||||
Add(MTACommands.RSET, "RSET");
|
|
||||||
Add(MTACommands.SAML_FROM, "SAML FROM");
|
|
||||||
Add(MTACommands.SEND_FROM, "SEND FROM");
|
|
||||||
Add(MTACommands.SOML_FROM, "SOML FROM");
|
|
||||||
Add(MTACommands.TURN, "TURN");
|
|
||||||
Add(MTACommands.VERB, "VERB");
|
|
||||||
Add(MTACommands.VRFY, "VRFY");
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
public enum MTACommands
|
|
||||||
{
|
|
||||||
HELO,
|
|
||||||
MAIL_FROM,
|
|
||||||
RCPT_TO,
|
|
||||||
DATA,
|
|
||||||
RSET,
|
|
||||||
QUIT,
|
|
||||||
HELP,
|
|
||||||
VRFY,
|
|
||||||
EXPN,
|
|
||||||
VERB,
|
|
||||||
NOOP,
|
|
||||||
TURN,
|
|
||||||
SEND_FROM,
|
|
||||||
SOML_FROM,
|
|
||||||
SAML_FROM
|
|
||||||
}
|
|
||||||
}
|
|
Some files were not shown because too many files have changed in this diff Show More
Loading…
Reference in New Issue
Block a user