-
Notifications
You must be signed in to change notification settings - Fork 73
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
6 changed files
with
258 additions
and
134 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| use std::io::ErrorKind; | ||
|
|
||
| use bytes::{Buf, BufMut, BytesMut}; | ||
| use quinn_proto::{coding::Codec, VarInt}; | ||
| use rand::distributions::Alphanumeric; | ||
| use tokio_util::codec::{Decoder, Encoder}; | ||
|
|
||
| use crate::session::SocksAddr; | ||
|
|
||
| pub struct Hy2TcpCodec; | ||
|
|
||
| /// ### format | ||
| /// | ||
| /// ```text | ||
| /// [uint8] Status (0x00 = OK, 0x01 = Error) | ||
| /// [varint] Message length | ||
| /// [bytes] Message string | ||
| /// [varint] Padding length | ||
| /// [bytes] Random padding | ||
| /// ``` | ||
| #[derive(Debug)] | ||
| pub struct Hy2TcpResp { | ||
| pub status: u8, | ||
| pub msg: String, | ||
| } | ||
|
|
||
| impl Decoder for Hy2TcpCodec { | ||
| type Error = std::io::Error; | ||
| type Item = Hy2TcpResp; | ||
|
|
||
| fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> { | ||
| if !src.has_remaining() { | ||
| return Err(ErrorKind::UnexpectedEof.into()); | ||
| } | ||
| let status = src.get_u8(); | ||
| let msg_len = VarInt::decode(src) | ||
| .map_err(|_| ErrorKind::InvalidData)? | ||
| .into_inner() as usize; | ||
|
|
||
| if src.remaining() < msg_len { | ||
| return Err(ErrorKind::UnexpectedEof.into()); | ||
| } | ||
|
|
||
| let msg: Vec<u8> = src.split_to(msg_len).into(); | ||
| let msg: String = | ||
| String::from_utf8(msg).map_err(|e| std::io::Error::new(ErrorKind::InvalidData, e))?; | ||
|
|
||
| let padding_len = VarInt::decode(src) | ||
| .map_err(|_| ErrorKind::UnexpectedEof)? | ||
| .into_inner() as usize; | ||
|
|
||
| if src.remaining() < padding_len { | ||
| return Err(ErrorKind::UnexpectedEof.into()); | ||
| } | ||
| src.advance(padding_len); | ||
|
|
||
| Ok(Hy2TcpResp { status, msg }.into()) | ||
| } | ||
| } | ||
|
|
||
| #[inline] | ||
| pub fn padding(range: std::ops::RangeInclusive<u32>) -> Vec<u8> { | ||
| use rand::Rng; | ||
| let mut rng = rand::thread_rng(); | ||
| let len = rng.gen_range(range) as usize; | ||
| rng.sample_iter(Alphanumeric).take(len).collect() | ||
| } | ||
|
|
||
| impl Encoder<&'_ SocksAddr> for Hy2TcpCodec { | ||
| type Error = std::io::Error; | ||
| fn encode(&mut self, item: &'_ SocksAddr, buf: &mut BytesMut) -> Result<(), Self::Error> { | ||
| const REQ_ID: VarInt = VarInt::from_u32(0x401); | ||
|
|
||
| let padding = padding(64..=512); | ||
| let padding_var = VarInt::from_u32(padding.len() as u32); | ||
|
|
||
| let addr = item.to_string().into_bytes(); | ||
| let addr_var = VarInt::from_u32(addr.len() as u32); | ||
|
|
||
| buf.reserve( | ||
| var_size(REQ_ID) | ||
| + var_size(padding_var) | ||
| + var_size(addr_var) | ||
| + addr.len() | ||
| + padding.len(), | ||
| ); | ||
|
|
||
| REQ_ID.encode(buf); | ||
|
|
||
| addr_var.encode(buf); | ||
| buf.put_slice(&addr); | ||
|
|
||
| padding_var.encode(buf); | ||
| buf.put_slice(&padding); | ||
|
|
||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| /// Compute the number of bytes needed to encode this value | ||
| pub fn var_size(var: VarInt) -> usize { | ||
| let x = var.into_inner(); | ||
| if x < 2u64.pow(6) { | ||
| 1 | ||
| } else if x < 2u64.pow(14) { | ||
| 2 | ||
| } else if x < 2u64.pow(30) { | ||
| 4 | ||
| } else if x < 2u64.pow(62) { | ||
| 8 | ||
| } else { | ||
| unreachable!("malformed VarInt"); | ||
| } | ||
| } | ||
|
|
||
| #[test] | ||
| fn hy2_resp_parse() { | ||
| let mut src = BytesMut::from(&[0x00, 0x03, 0x61, 0x62, 0x63, 0x00][..]); | ||
| let msg = Hy2TcpCodec.decode(&mut src).unwrap().unwrap(); | ||
| assert!(msg.status == 0); | ||
| assert!(msg.msg == "abc"); | ||
|
|
||
| let mut src = BytesMut::from(&[0x01, 0x00, 0x00][..]); | ||
| let msg = Hy2TcpCodec.decode(&mut src).unwrap().unwrap(); | ||
| assert!(msg.status == 0x1); | ||
| assert!(msg.msg == ""); | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.