Implementing udp support partially...in theory. Still untested :)
This commit is contained in:
parent
f7af1ac020
commit
7530ce3aae
2
.editorconfig
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2
.editorconfig
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@ -0,0 +1,2 @@
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[*.rs]
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indent_size = 4
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142
Cargo.lock
generated
142
Cargo.lock
generated
@ -128,9 +128,9 @@ dependencies = [
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[[package]]
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name = "hashbrown"
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||||
version = "0.11.2"
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||||
version = "0.12.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
|
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checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
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[[package]]
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name = "hermit-abi"
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@ -143,9 +143,9 @@ dependencies = [
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||||
[[package]]
|
||||
name = "indexmap"
|
||||
version = "1.8.0"
|
||||
version = "1.9.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "282a6247722caba404c065016bbfa522806e51714c34f5dfc3e4a3a46fcb4223"
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checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
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dependencies = [
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"autocfg",
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"hashbrown",
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@ -163,12 +163,6 @@ version = "0.2.121"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "efaa7b300f3b5fe8eb6bf21ce3895e1751d9665086af2d64b42f19701015ff4f"
|
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[[package]]
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||||
name = "linked-hash-map"
|
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version = "0.5.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
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[[package]]
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name = "lock_api"
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version = "0.4.6"
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@ -195,34 +189,14 @@ checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
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[[package]]
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name = "mio"
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version = "0.8.2"
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version = "0.8.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "52da4364ffb0e4fe33a9841a98a3f3014fb964045ce4f7a45a398243c8d6b0c9"
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checksum = "57ee1c23c7c63b0c9250c339ffdc69255f110b298b901b9f6c82547b7b87caaf"
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dependencies = [
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"libc",
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"log",
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"miow",
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"ntapi",
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"wasi",
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"winapi",
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]
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[[package]]
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name = "miow"
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||||
version = "0.3.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b9f1c5b025cda876f66ef43a113f91ebc9f4ccef34843000e0adf6ebbab84e21"
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dependencies = [
|
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"winapi",
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]
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[[package]]
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name = "ntapi"
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version = "0.3.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c28774a7fd2fbb4f0babd8237ce554b73af68021b5f695a3cebd6c59bac0980f"
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dependencies = [
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"winapi",
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"windows-sys 0.36.1",
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]
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[[package]]
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@ -261,7 +235,7 @@ dependencies = [
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"libc",
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"redox_syscall",
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"smallvec",
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"windows-sys",
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"windows-sys 0.32.0",
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]
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[[package]]
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@ -284,11 +258,11 @@ checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
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[[package]]
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name = "proc-macro2"
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version = "1.0.36"
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version = "1.0.43"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
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checksum = "0a2ca2c61bc9f3d74d2886294ab7b9853abd9c1ad903a3ac7815c58989bb7bab"
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dependencies = [
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"unicode-xid",
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"unicode-ident",
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]
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[[package]]
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||||
@ -366,18 +340,18 @@ checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
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[[package]]
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name = "serde"
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version = "1.0.136"
|
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version = "1.0.144"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ce31e24b01e1e524df96f1c2fdd054405f8d7376249a5110886fb4b658484789"
|
||||
checksum = "0f747710de3dcd43b88c9168773254e809d8ddbdf9653b84e2554ab219f17860"
|
||||
dependencies = [
|
||||
"serde_derive",
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]
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[[package]]
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name = "serde_derive"
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||||
version = "1.0.136"
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version = "1.0.144"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "08597e7152fcd306f41838ed3e37be9eaeed2b61c42e2117266a554fab4662f9"
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checksum = "94ed3a816fb1d101812f83e789f888322c34e291f894f19590dc310963e87a00"
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dependencies = [
|
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"proc-macro2",
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"quote",
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@ -397,14 +371,15 @@ dependencies = [
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[[package]]
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name = "serde_yaml"
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version = "0.8.23"
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version = "0.9.13"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a4a521f2940385c165a24ee286aa8599633d162077a54bdcae2a6fd5a7bfa7a0"
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checksum = "8613d593412a0deb7bbd8de9d908efff5a0cb9ccd8f62c641e7b2ed2f57291d1"
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dependencies = [
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"indexmap",
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"itoa",
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"ryu",
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"serde",
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"yaml-rust",
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"unsafe-libyaml",
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]
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[[package]]
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@ -446,21 +421,22 @@ dependencies = [
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[[package]]
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name = "syn"
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version = "1.0.89"
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version = "1.0.100"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "ea297be220d52398dcc07ce15a209fce436d361735ac1db700cab3b6cdfb9f54"
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checksum = "52205623b1b0f064a4e71182c3b18ae902267282930c6d5462c91b859668426e"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-xid",
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"unicode-ident",
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]
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[[package]]
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name = "tokio"
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version = "1.17.0"
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version = "1.21.1"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2af73ac49756f3f7c01172e34a23e5d0216f6c32333757c2c61feb2bbff5a5ee"
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checksum = "0020c875007ad96677dcc890298f4b942882c5d4eb7cc8f439fc3bf813dc9c95"
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dependencies = [
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"autocfg",
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"bytes",
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"libc",
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"memchr",
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@ -487,10 +463,16 @@ dependencies = [
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]
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[[package]]
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name = "unicode-xid"
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version = "0.2.2"
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name = "unicode-ident"
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version = "1.0.4"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
|
||||
checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
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[[package]]
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||||
name = "unsafe-libyaml"
|
||||
version = "0.2.4"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c1e5fa573d8ac5f1a856f8d7be41d390ee973daf97c806b2c1a465e4e1406e68"
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[[package]]
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name = "wasi"
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@ -526,11 +508,24 @@ version = "0.32.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3df6e476185f92a12c072be4a189a0210dcdcf512a1891d6dff9edb874deadc6"
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dependencies = [
|
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"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
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"windows_i686_msvc",
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"windows_x86_64_gnu",
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"windows_x86_64_msvc",
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||||
"windows_aarch64_msvc 0.32.0",
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"windows_i686_gnu 0.32.0",
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"windows_i686_msvc 0.32.0",
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"windows_x86_64_gnu 0.32.0",
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"windows_x86_64_msvc 0.32.0",
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]
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[[package]]
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name = "windows-sys"
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||||
version = "0.36.1"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
|
||||
dependencies = [
|
||||
"windows_aarch64_msvc 0.36.1",
|
||||
"windows_i686_gnu 0.36.1",
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||||
"windows_i686_msvc 0.36.1",
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"windows_x86_64_gnu 0.36.1",
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"windows_x86_64_msvc 0.36.1",
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]
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[[package]]
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@ -539,24 +534,48 @@ version = "0.32.0"
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||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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||||
checksum = "d8e92753b1c443191654ec532f14c199742964a061be25d77d7a96f09db20bf5"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.32.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6a711c68811799e017b6038e0922cb27a5e2f43a2ddb609fe0b6f3eeda9de615"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.32.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "146c11bb1a02615db74680b32a68e2d61f553cc24c4eb5b4ca10311740e44172"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.32.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c912b12f7454c6620635bbff3450962753834be2a594819bd5e945af18ec64bc"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
|
||||
|
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[[package]]
|
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name = "windows_x86_64_msvc"
|
||||
version = "0.32.0"
|
||||
@ -564,10 +583,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
|
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checksum = "504a2476202769977a040c6364301a3f65d0cc9e3fb08600b2bda150a0488316"
|
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|
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[[package]]
|
||||
name = "yaml-rust"
|
||||
version = "0.4.5"
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
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checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
|
||||
dependencies = [
|
||||
"linked-hash-map",
|
||||
]
|
||||
checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
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@ -8,16 +8,16 @@ license = "ISC"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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tokio = { version = "1.17.0", features = ["full"] }
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||||
tokio = { version = "1.21.1", features = ["full"] }
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||||
futures = "0.3.21"
|
||||
serde = { version = "1.0.136", features = ["derive"] }
|
||||
serde_json = "1.0.79"
|
||||
serde_yaml = "0.8.23"
|
||||
serde_yaml = "0.9.13"
|
||||
simple-error = "0.2.3"
|
||||
rand = "0.8.5"
|
||||
|
||||
[profile.release]
|
||||
opt-level = 3 # Optimize for size.
|
||||
opt-level = 3 # Optimize for size.
|
||||
lto = true # Enable Link Time Optimization
|
||||
codegen-units = 1 # Reduce number of codegen units to increase optimizations.
|
||||
panic = 'abort' # Abort on panic
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|
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58
src/main.rs
58
src/main.rs
@ -1,6 +1,7 @@
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mod listener;
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||||
mod shutdown;
|
||||
mod tcp;
|
||||
mod udp;
|
||||
|
||||
use serde::Deserialize;
|
||||
use simple_error::bail;
|
||||
@ -14,14 +15,14 @@ use tokio::sync::{broadcast, RwLock};
|
||||
|
||||
#[derive(Debug, Deserialize)]
|
||||
struct Target {
|
||||
udp: Option<bool>,
|
||||
source: String,
|
||||
targets: Vec<String>,
|
||||
}
|
||||
|
||||
#[derive(Debug, Deserialize)]
|
||||
struct Config {
|
||||
tcp: Vec<Target>,
|
||||
// udp: Vec<Target>,
|
||||
mappings: Vec<Target>,
|
||||
}
|
||||
|
||||
fn load_yaml(path: &Path) -> Result<Config, Box<dyn Error>> {
|
||||
@ -62,6 +63,7 @@ fn load_config() -> Result<Config, Box<dyn Error>> {
|
||||
|
||||
// #[derive(Debug)]
|
||||
struct ActiveListener {
|
||||
udp: bool,
|
||||
notify_shutdown: broadcast::Sender<()>,
|
||||
targets: Arc<RwLock<Vec<String>>>,
|
||||
}
|
||||
@ -75,27 +77,34 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||
let config = load_config().expect("config not found");
|
||||
let mut required_listeners: HashSet<String> = HashSet::new();
|
||||
|
||||
for target in config.tcp {
|
||||
required_listeners.insert(target.source.clone());
|
||||
if let Some(listener) = listeners.get(&target.source) {
|
||||
for target in config.mappings {
|
||||
let mut source_str = "".to_owned();
|
||||
if target.udp == None || target.udp == Some(false) {
|
||||
source_str.push_str("udp:");
|
||||
} else {
|
||||
source_str.push_str("tcp:");
|
||||
}
|
||||
source_str.push_str(&target.source);
|
||||
|
||||
required_listeners.insert(source_str.clone());
|
||||
if let Some(listener) = listeners.get(&source_str) {
|
||||
let mut invalid = false;
|
||||
{
|
||||
let targets = listener.targets.read().await;
|
||||
for t in &target.targets {
|
||||
if !targets.iter().any(|e| *e == *t) {
|
||||
|
||||
let targets = listener.targets.read().await;
|
||||
for t in &target.targets {
|
||||
if !targets.iter().any(|e| *e == *t) {
|
||||
invalid = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if !invalid {
|
||||
for t in targets.iter() {
|
||||
if !target.targets.iter().any(|e| *e == *t) {
|
||||
invalid = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if !invalid {
|
||||
for t in targets.iter() {
|
||||
if !target.targets.iter().any(|e| *e == *t) {
|
||||
invalid = true;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if invalid {
|
||||
@ -109,6 +118,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||
let listener = ActiveListener {
|
||||
notify_shutdown: notify_shutdown,
|
||||
targets: Arc::new(RwLock::new(target.targets)),
|
||||
udp: target.udp == None || target.udp == Some(false),
|
||||
};
|
||||
|
||||
let l = listener::Listener {
|
||||
@ -118,12 +128,18 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||
};
|
||||
|
||||
tokio::spawn(async move {
|
||||
if let Err(err) = tcp::start_tcp_listener(l).await {
|
||||
println!("listener error: {}", err);
|
||||
if target.udp == None || target.udp == Some(false) {
|
||||
if let Err(err) = tcp::start_tcp_listener(l).await {
|
||||
println!("tcp listener error: {}", err);
|
||||
}
|
||||
} else {
|
||||
if let Err(err) = udp::start_udp_listener(l).await {
|
||||
println!("udp listener error: {}", err);
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
listeners.insert(target.source, listener);
|
||||
listeners.insert(source_str, listener);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
@ -11,39 +11,48 @@ use tokio::sync::broadcast;
|
||||
/// received or not.
|
||||
#[derive(Debug)]
|
||||
pub(crate) struct Shutdown {
|
||||
/// `true` if the shutdown signal has been received
|
||||
shutdown: bool,
|
||||
/// `true` if the shutdown signal has been received
|
||||
shutdown: bool,
|
||||
|
||||
/// The receive half of the channel used to listen for shutdown.
|
||||
notify: broadcast::Receiver<()>,
|
||||
/// The receive half of the channel used to listen for shutdown.
|
||||
notify: broadcast::Receiver<()>,
|
||||
}
|
||||
|
||||
impl Shutdown {
|
||||
/// Create a new `Shutdown` backed by the given `broadcast::Receiver`.
|
||||
pub(crate) fn new(notify: broadcast::Receiver<()>) -> Shutdown {
|
||||
Shutdown {
|
||||
shutdown: false,
|
||||
notify,
|
||||
}
|
||||
}
|
||||
/// Create a new `Shutdown` backed by the given `broadcast::Receiver`.
|
||||
pub(crate) fn new(notify: broadcast::Receiver<()>) -> Shutdown {
|
||||
Shutdown {
|
||||
shutdown: false,
|
||||
notify,
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns `true` if the shutdown signal has been received.
|
||||
// pub(crate) fn is_shutdown(&self) -> bool {
|
||||
// self.shutdown
|
||||
// }
|
||||
/// Returns `true` if the shutdown signal has been received.
|
||||
// pub(crate) fn is_shutdown(&self) -> bool {
|
||||
// self.shutdown
|
||||
// }
|
||||
|
||||
/// Receive the shutdown notice, waiting if necessary.
|
||||
pub(crate) async fn recv(&mut self) {
|
||||
// If the shutdown signal has already been received, then return
|
||||
// immediately.
|
||||
if self.shutdown {
|
||||
return;
|
||||
}
|
||||
/// Receive the shutdown notice, waiting if necessary.
|
||||
pub(crate) async fn recv(&mut self) {
|
||||
// If the shutdown signal has already been received, then return
|
||||
// immediately.
|
||||
if self.shutdown {
|
||||
return;
|
||||
}
|
||||
|
||||
// Cannot receive a "lag error" as only one value is ever sent.
|
||||
let _ = self.notify.recv().await;
|
||||
// Cannot receive a "lag error" as only one value is ever sent.
|
||||
let _ = self.notify.recv().await;
|
||||
|
||||
// Remember that the signal has been received.
|
||||
self.shutdown = true;
|
||||
}
|
||||
// Remember that the signal has been received.
|
||||
self.shutdown = true;
|
||||
}
|
||||
}
|
||||
|
||||
impl Clone for Shutdown {
|
||||
fn clone(&self) -> Self {
|
||||
Shutdown {
|
||||
shutdown: self.shutdown,
|
||||
notify: self.notify.resubscribe(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
74
src/tcp.rs
74
src/tcp.rs
@ -5,54 +5,54 @@ use tokio::net::{TcpListener, TcpStream};
|
||||
|
||||
#[derive(Debug)]
|
||||
struct TcpHandler {
|
||||
stream: TcpStream,
|
||||
target: String,
|
||||
stream: TcpStream,
|
||||
target: String,
|
||||
}
|
||||
|
||||
impl TcpHandler {
|
||||
async fn run(&mut self) -> Result<(), Box<dyn Error>> {
|
||||
let mut stream = TcpStream::connect(&self.target).await?;
|
||||
async fn run(&mut self) -> Result<(), Box<dyn Error>> {
|
||||
let mut stream = TcpStream::connect(&self.target).await?;
|
||||
|
||||
tokio::io::copy_bidirectional(&mut self.stream, &mut stream).await?;
|
||||
tokio::io::copy_bidirectional(&mut self.stream, &mut stream).await?;
|
||||
|
||||
return Ok(());
|
||||
}
|
||||
return Ok(());
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) async fn start_tcp_listener(
|
||||
mut listener_config: Listener,
|
||||
mut listener_config: Listener,
|
||||
) -> Result<(), Box<dyn Error>> {
|
||||
println!("start listening on {}", &listener_config.source);
|
||||
let listener = TcpListener::bind(&listener_config.source).await?;
|
||||
println!("start listening on {}", &listener_config.source);
|
||||
let listener = TcpListener::bind(&listener_config.source).await?;
|
||||
|
||||
loop {
|
||||
let (next_socket, _) = tokio::select! {
|
||||
res = listener.accept() => res?,
|
||||
_ = listener_config.shutdown.recv() => {
|
||||
println!("Exiting listener!");
|
||||
return Ok(());
|
||||
}
|
||||
};
|
||||
loop {
|
||||
let (next_socket, _) = tokio::select! {
|
||||
res = listener.accept() => res?,
|
||||
_ = listener_config.shutdown.recv() => {
|
||||
println!("Exiting listener!");
|
||||
return Ok(());
|
||||
}
|
||||
};
|
||||
|
||||
let targets = listener_config.targets.read().await;
|
||||
let mut rng = rand::thread_rng();
|
||||
let selected_target = targets.choose(&mut rng).unwrap();
|
||||
let targets = listener_config.targets.read().await;
|
||||
let mut rng = rand::thread_rng();
|
||||
let selected_target = targets.choose(&mut rng).unwrap();
|
||||
|
||||
println!(
|
||||
"new connection from {} forwarding to {}",
|
||||
next_socket.peer_addr()?,
|
||||
&selected_target
|
||||
);
|
||||
let mut handler = TcpHandler {
|
||||
stream: next_socket,
|
||||
target: selected_target.clone(),
|
||||
};
|
||||
println!(
|
||||
"new connection from {} forwarding to {}",
|
||||
next_socket.peer_addr()?,
|
||||
&selected_target
|
||||
);
|
||||
let mut handler = TcpHandler {
|
||||
stream: next_socket,
|
||||
target: selected_target.clone(),
|
||||
};
|
||||
|
||||
tokio::spawn(async move {
|
||||
// Process the connection. If an error is encountered, log it.
|
||||
if let Err(err) = handler.run().await {
|
||||
println!("connection error {}", err);
|
||||
}
|
||||
});
|
||||
}
|
||||
tokio::spawn(async move {
|
||||
// Process the connection. If an error is encountered, log it.
|
||||
if let Err(err) = handler.run().await {
|
||||
println!("connection error {}", err);
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
178
src/udp.rs
178
src/udp.rs
@ -1,2 +1,176 @@
|
||||
// For UDP to work, there is some magic required with matches the returning packets
|
||||
// back to the original sender. Idk. how to do that right now, but maybe some day.
|
||||
use crate::listener::Listener;
|
||||
use crate::shutdown::Shutdown;
|
||||
use rand::seq::SliceRandom;
|
||||
use std::collections::HashMap;
|
||||
use std::error::Error;
|
||||
use std::sync::Arc;
|
||||
use tokio::net::UdpSocket;
|
||||
use tokio::sync::broadcast;
|
||||
use tokio::sync::mpsc::{channel, Sender};
|
||||
use tokio::sync::Mutex;
|
||||
use tokio::time::Instant;
|
||||
|
||||
async fn create_dual_udpsocket(
|
||||
bind_addr: &String,
|
||||
) -> Result<(UdpSocket, UdpSocket), Box<dyn Error>> {
|
||||
let listener_std = std::net::UdpSocket::bind(bind_addr)?;
|
||||
let responder_std = listener_std.try_clone()?;
|
||||
let listener = UdpSocket::from_std(listener_std)?;
|
||||
let responder = UdpSocket::from_std(responder_std)?;
|
||||
|
||||
return Ok((listener, responder));
|
||||
}
|
||||
|
||||
fn get_udp_background_send(socket: UdpSocket, mut exit: Shutdown) -> Sender<(Vec<u8>, String)> {
|
||||
let (tx, mut rx) = channel::<(Vec<u8>, String)>(1);
|
||||
|
||||
tokio::spawn(async move {
|
||||
loop {
|
||||
let (buf, dest) = (tokio::select! {
|
||||
res = rx.recv() => Some(res.unwrap()),
|
||||
_ = exit.recv() => {
|
||||
println!("Exiting listener!");
|
||||
return;
|
||||
}
|
||||
})
|
||||
.unwrap();
|
||||
|
||||
let to_send = buf.as_slice();
|
||||
socket.send_to(to_send, &dest).await.expect(&format!(
|
||||
"Failed to forward response from upstream server to client {}",
|
||||
dest
|
||||
));
|
||||
}
|
||||
});
|
||||
|
||||
return tx;
|
||||
}
|
||||
|
||||
struct UdpHandler {
|
||||
last_packet: Arc<Mutex<Instant>>,
|
||||
kill: broadcast::Sender<()>,
|
||||
target: String,
|
||||
sender: Sender<(Vec<u8>, String)>,
|
||||
}
|
||||
|
||||
impl UdpHandler {
|
||||
async fn start(
|
||||
target: String,
|
||||
source: String,
|
||||
sender: Sender<(Vec<u8>, String)>,
|
||||
) -> Result<UdpHandler, Box<dyn Error>> {
|
||||
// Kill Channel
|
||||
let (tx, mut rx) = broadcast::channel::<()>(1);
|
||||
|
||||
let (listener, responder) = create_dual_udpsocket(&"0.0.0.0:0".to_owned()).await?;
|
||||
|
||||
let s = get_udp_background_send(responder, Shutdown::new(tx.subscribe()));
|
||||
|
||||
let last_packet = Arc::new(Mutex::new(Instant::now()));
|
||||
|
||||
let handler = UdpHandler {
|
||||
kill: tx,
|
||||
last_packet: last_packet.clone(),
|
||||
// source: source.clone(),
|
||||
target: target.clone(),
|
||||
sender: s,
|
||||
};
|
||||
|
||||
listener.connect(target).await?;
|
||||
tokio::spawn(async move {
|
||||
let mut buf = [0; 64 * 1024];
|
||||
loop {
|
||||
let (num_bytes, _) = tokio::select! {
|
||||
res = listener.recv_from(&mut buf) => res.unwrap(),
|
||||
_ = rx.recv() => {
|
||||
// FIXME: Source of memory leaks?
|
||||
return ;
|
||||
}
|
||||
};
|
||||
let mut n = last_packet.lock().await;
|
||||
*n = Instant::now();
|
||||
sender
|
||||
.send((buf[0..num_bytes].to_vec(), source.clone()))
|
||||
.await
|
||||
.expect(&format!("Failed to send answer to sender {}", source));
|
||||
}
|
||||
});
|
||||
return Ok(handler);
|
||||
}
|
||||
|
||||
async fn exit(&self) -> Result<(), Box<dyn Error>> {
|
||||
self.kill.send(())?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
async fn on_packet(&mut self, pkg: Vec<u8>) -> Result<(), Box<dyn Error>> {
|
||||
let mut n = self.last_packet.lock().await;
|
||||
*n = Instant::now();
|
||||
self.sender.send((pkg, self.target.clone())).await?;
|
||||
return Ok(());
|
||||
}
|
||||
}
|
||||
|
||||
pub(crate) async fn start_udp_listener(
|
||||
mut listener_config: Listener,
|
||||
) -> Result<(), Box<dyn Error>> {
|
||||
println!("start listening on {}", &listener_config.source);
|
||||
let (listener, responder) =
|
||||
create_dual_udpsocket(&listener_config.source)
|
||||
.await
|
||||
.expect(&format!(
|
||||
"Failed to clone primary listening address socket {}",
|
||||
&listener_config.source,
|
||||
));
|
||||
|
||||
let sender = get_udp_background_send(responder, listener_config.shutdown.clone());
|
||||
|
||||
let mut connections: HashMap<String, UdpHandler> = HashMap::new();
|
||||
|
||||
let mut buf = [0; 64 * 1024];
|
||||
loop {
|
||||
let (num_bytes, src_addr) = tokio::select! {
|
||||
res = listener.recv_from(&mut buf) => res?,
|
||||
_ = listener_config.shutdown.recv() => {
|
||||
println!("Exiting listener!");
|
||||
break;
|
||||
}
|
||||
};
|
||||
|
||||
let addr = src_addr.to_string();
|
||||
let handler_opt = connections.get_mut(&addr);
|
||||
let vec = buf[0..num_bytes].to_vec();
|
||||
let handler = match handler_opt {
|
||||
Some(handler) => handler,
|
||||
None => {
|
||||
let targets = listener_config.targets.read().await;
|
||||
let selected_target = {
|
||||
let mut rng = rand::thread_rng();
|
||||
targets.choose(&mut rng).unwrap()
|
||||
};
|
||||
|
||||
let handler =
|
||||
UdpHandler::start(selected_target.clone(), addr.clone(), sender.clone())
|
||||
.await?;
|
||||
connections.insert(addr.clone(), handler);
|
||||
|
||||
connections.get_mut(&addr).unwrap()
|
||||
}
|
||||
};
|
||||
|
||||
match handler.on_packet(vec).await {
|
||||
Ok(_) => (),
|
||||
Err(err) => {
|
||||
println!("Failed to forward request from client to server {}", err);
|
||||
return Ok(());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for handler in connections.values() {
|
||||
handler.exit().await?;
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user