feat: 握手写完了
This commit is contained in:
parent
1f5be02810
commit
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/target
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/target
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/joh_git
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# It is not intended for manual editing.
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# It is not intended for manual editing.
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|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
|
||||||
|
dependencies = [
|
||||||
|
"semver-parser",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "semver-parser"
|
||||||
|
version = "0.7.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "shlex"
|
||||||
|
version = "1.3.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "slab"
|
||||||
|
version = "0.4.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "8f92a496fb766b417c996b9c5e57daf2f7ad3b0bebe1ccfca4856390e3d3bb67"
|
||||||
|
dependencies = [
|
||||||
|
"autocfg",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "smallvec"
|
||||||
|
version = "0.6.14"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "b97fcaeba89edba30f044a10c6a3cc39df9c3f17d7cd829dd1446cab35f890e0"
|
||||||
|
dependencies = [
|
||||||
|
"maybe-uninit",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio"
|
||||||
|
version = "0.1.22"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"mio",
|
||||||
|
"num_cpus",
|
||||||
|
"tokio-codec",
|
||||||
|
"tokio-current-thread",
|
||||||
|
"tokio-executor",
|
||||||
|
"tokio-fs",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-reactor",
|
||||||
|
"tokio-sync",
|
||||||
|
"tokio-tcp",
|
||||||
|
"tokio-threadpool",
|
||||||
|
"tokio-timer",
|
||||||
|
"tokio-udp",
|
||||||
|
"tokio-uds",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-codec"
|
||||||
|
version = "0.1.2"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "25b2998660ba0e70d18684de5d06b70b70a3a747469af9dea7618cc59e75976b"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"tokio-io",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-core"
|
||||||
|
version = "0.1.18"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "87b1395334443abca552f63d4f61d0486f12377c2ba8b368e523f89e828cffd4"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"iovec",
|
||||||
|
"log",
|
||||||
|
"mio",
|
||||||
|
"scoped-tls",
|
||||||
|
"tokio",
|
||||||
|
"tokio-executor",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-reactor",
|
||||||
|
"tokio-timer",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-current-thread"
|
||||||
|
version = "0.1.7"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "b1de0e32a83f131e002238d7ccde18211c0a5397f60cbfffcb112868c2e0e20e"
|
||||||
|
dependencies = [
|
||||||
|
"futures",
|
||||||
|
"tokio-executor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-executor"
|
||||||
|
version = "0.1.10"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "fb2d1b8f4548dbf5e1f7818512e9c406860678f29c300cdf0ebac72d1a3a1671"
|
||||||
|
dependencies = [
|
||||||
|
"crossbeam-utils",
|
||||||
|
"futures",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-fs"
|
||||||
|
version = "0.1.7"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "297a1206e0ca6302a0eed35b700d292b275256f596e2f3fea7729d5e629b6ff4"
|
||||||
|
dependencies = [
|
||||||
|
"futures",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-threadpool",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-io"
|
||||||
|
version = "0.1.13"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "57fc868aae093479e3131e3d165c93b1c7474109d13c90ec0dda2a1bbfff0674"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"log",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-reactor"
|
||||||
|
version = "0.1.12"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "09bc590ec4ba8ba87652da2068d150dcada2cfa2e07faae270a5e0409aa51351"
|
||||||
|
dependencies = [
|
||||||
|
"crossbeam-utils",
|
||||||
|
"futures",
|
||||||
|
"lazy_static",
|
||||||
|
"log",
|
||||||
|
"mio",
|
||||||
|
"num_cpus",
|
||||||
|
"parking_lot",
|
||||||
|
"slab",
|
||||||
|
"tokio-executor",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-sync",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-sync"
|
||||||
|
version = "0.1.8"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "edfe50152bc8164fcc456dab7891fa9bf8beaf01c5ee7e1dd43a397c3cf87dee"
|
||||||
|
dependencies = [
|
||||||
|
"fnv",
|
||||||
|
"futures",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-tcp"
|
||||||
|
version = "0.1.4"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "98df18ed66e3b72e742f185882a9e201892407957e45fbff8da17ae7a7c51f72"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"iovec",
|
||||||
|
"mio",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-reactor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-threadpool"
|
||||||
|
version = "0.1.18"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "df720b6581784c118f0eb4310796b12b1d242a7eb95f716a8367855325c25f89"
|
||||||
|
dependencies = [
|
||||||
|
"crossbeam-deque",
|
||||||
|
"crossbeam-queue",
|
||||||
|
"crossbeam-utils",
|
||||||
|
"futures",
|
||||||
|
"lazy_static",
|
||||||
|
"log",
|
||||||
|
"num_cpus",
|
||||||
|
"slab",
|
||||||
|
"tokio-executor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-timer"
|
||||||
|
version = "0.2.13"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "93044f2d313c95ff1cb7809ce9a7a05735b012288a888b62d4434fd58c94f296"
|
||||||
|
dependencies = [
|
||||||
|
"crossbeam-utils",
|
||||||
|
"futures",
|
||||||
|
"slab",
|
||||||
|
"tokio-executor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-udp"
|
||||||
|
version = "0.1.6"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "e2a0b10e610b39c38b031a2fcab08e4b82f16ece36504988dcbd81dbba650d82"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"log",
|
||||||
|
"mio",
|
||||||
|
"tokio-codec",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-reactor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tokio-uds"
|
||||||
|
version = "0.2.7"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ab57a4ac4111c8c9dbcf70779f6fc8bc35ae4b2454809febac840ad19bd7e4e0"
|
||||||
|
dependencies = [
|
||||||
|
"bytes",
|
||||||
|
"futures",
|
||||||
|
"iovec",
|
||||||
|
"libc",
|
||||||
|
"log",
|
||||||
|
"mio",
|
||||||
|
"mio-uds",
|
||||||
|
"tokio-codec",
|
||||||
|
"tokio-io",
|
||||||
|
"tokio-reactor",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "tun-tap"
|
||||||
|
version = "0.1.4"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "9a477a4e9367c72ac875d23cd07ac99ffa932497d8428767fed0cfa27bbabe50"
|
||||||
|
dependencies = [
|
||||||
|
"cc",
|
||||||
|
"futures",
|
||||||
|
"libc",
|
||||||
|
"mio",
|
||||||
|
"tokio-core",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.2.8"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi"
|
||||||
|
version = "0.3.9"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||||
|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
"winapi-x86_64-pc-windows-gnu",
|
||||||
|
]
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-build"
|
||||||
|
version = "0.1.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-i686-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "winapi-x86_64-pc-windows-gnu"
|
||||||
|
version = "0.4.0"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "ws2_32-sys"
|
||||||
|
version = "0.2.1"
|
||||||
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
|
checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
|
||||||
|
dependencies = [
|
||||||
|
"winapi 0.2.8",
|
||||||
|
"winapi-build",
|
||||||
|
]
|
||||||
|
|||||||
@ -4,3 +4,5 @@ version = "0.1.0"
|
|||||||
edition = "2021"
|
edition = "2021"
|
||||||
|
|
||||||
[dependencies]
|
[dependencies]
|
||||||
|
etherparse = "0.17.0"
|
||||||
|
tun-tap = "0.1.4"
|
||||||
|
|||||||
69
examples/bin.rs
Normal file
69
examples/bin.rs
Normal file
@ -0,0 +1,69 @@
|
|||||||
|
use rs_tcp::*;
|
||||||
|
use std::{
|
||||||
|
collections::{hash_map::Entry, HashMap},
|
||||||
|
io,
|
||||||
|
};
|
||||||
|
|
||||||
|
fn main() -> io::Result<()> {
|
||||||
|
let mut nic = tun_tap::Iface::without_packet_info("mytun0", tun_tap::Mode::Tun)?;
|
||||||
|
let mut buffer = vec![0; 1500];
|
||||||
|
// 保存所有连接对应的状态
|
||||||
|
let mut connections: HashMap<Quad, Connection> = HashMap::new();
|
||||||
|
|
||||||
|
loop {
|
||||||
|
let nbytes = nic.recv(&mut buffer).unwrap();
|
||||||
|
// 忽略非TCP数据包
|
||||||
|
match etherparse::Ipv4HeaderSlice::from_slice(&buffer) {
|
||||||
|
Ok(iph) => {
|
||||||
|
let src = iph.source_addr();
|
||||||
|
let dst = iph.destination_addr();
|
||||||
|
let proto = iph.protocol();
|
||||||
|
if proto != etherparse::IpNumber(0x06) {
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
match etherparse::TcpHeaderSlice::from_slice(&buffer[iph.slice().len()..nbytes]) {
|
||||||
|
Ok(tcph) => {
|
||||||
|
let payload_offset = iph.slice().len() + tcph.slice().len();
|
||||||
|
let mut payload = &buffer[payload_offset..nbytes];
|
||||||
|
|
||||||
|
let recv_quad = Quad {
|
||||||
|
src: (src, tcph.source_port()),
|
||||||
|
dst: (dst, tcph.destination_port()),
|
||||||
|
};
|
||||||
|
// 这里我们需要处理接收到的Tcp数据包
|
||||||
|
match connections.entry(recv_quad) {
|
||||||
|
Entry::Occupied(mut occupied_entry) => {
|
||||||
|
// 已经存在的连接
|
||||||
|
occupied_entry.get_mut().on_packet(iph, tcph, &payload);
|
||||||
|
},
|
||||||
|
Entry::Vacant(vacant_entry) => {
|
||||||
|
eprintln!(
|
||||||
|
"{}:{} -> {}:{} first handpacket syn: {}, seq: {}",
|
||||||
|
src,
|
||||||
|
tcph.source_port(),
|
||||||
|
dst,
|
||||||
|
tcph.destination_port(),
|
||||||
|
tcph.syn(),
|
||||||
|
tcph.sequence_number()
|
||||||
|
);
|
||||||
|
// 第一次接受的包
|
||||||
|
if let Some(c) = Connection::accept(&mut nic, iph, tcph)?{
|
||||||
|
vacant_entry.insert(c);
|
||||||
|
}
|
||||||
|
},
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Err(e) => {
|
||||||
|
// 这不是一个TCP包 但是协议是TCP
|
||||||
|
eprintln!("ignoring weird packet: {:?}", e)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Err(_) => {
|
||||||
|
// 非IP标准包 忽略
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
};
|
||||||
|
}
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
7
readme.md
Normal file
7
readme.md
Normal file
@ -0,0 +1,7 @@
|
|||||||
|
# rs-tcp
|
||||||
|
|
||||||
|
使用`rust`从底层网络链路实现`TCP`协议。
|
||||||
|
|
||||||
|
```bash
|
||||||
|
git remote add origin ssh://git@81.70.52.148:17022/asahi/rs-tcp.git
|
||||||
|
```
|
||||||
13
run.sh
Executable file
13
run.sh
Executable file
@ -0,0 +1,13 @@
|
|||||||
|
#!/bin/bash
|
||||||
|
cargo build --example bin -r
|
||||||
|
ext=$?
|
||||||
|
if [[ $ext -ne 0 ]]; then
|
||||||
|
exit $ext
|
||||||
|
fi
|
||||||
|
sudo setcap cap_net_admin=eip ./target/release/examples/bin
|
||||||
|
./target/release/examples/bin &
|
||||||
|
pid=$!
|
||||||
|
sudo ip addr add 192.168.0.1/24 dev mytun0
|
||||||
|
sudo ip link set up dev mytun0
|
||||||
|
trap "kill $pid" INT TERM
|
||||||
|
wait $pid
|
||||||
165
src/lib.rs
165
src/lib.rs
@ -1,14 +1,161 @@
|
|||||||
pub fn add(left: u64, right: u64) -> u64 {
|
use std::{io, net::Ipv4Addr};
|
||||||
left + right
|
|
||||||
|
#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)]
|
||||||
|
pub struct Quad {
|
||||||
|
pub src: (Ipv4Addr, u16),
|
||||||
|
pub dst: (Ipv4Addr, u16),
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(test)]
|
#[derive(Debug)]
|
||||||
mod tests {
|
pub enum State {
|
||||||
use super::*;
|
//Listen,
|
||||||
|
SynRcvd,
|
||||||
|
Estab,
|
||||||
|
FinWait1,
|
||||||
|
FinWait2,
|
||||||
|
TimeWait,
|
||||||
|
}
|
||||||
|
/// 对于一个连接,我们需要保存其中的状态上下文
|
||||||
|
/// 主要是滑动窗口部分的状态
|
||||||
|
pub struct RecvStateContext {
|
||||||
|
/// 下一个接受的seq值
|
||||||
|
pub nxt: u32,
|
||||||
|
/// 窗口大小
|
||||||
|
pub wnd: u16,
|
||||||
|
/// 由对方设置的初始接受序列号
|
||||||
|
pub irs: u32,
|
||||||
|
}
|
||||||
|
/// 一个连接既可以是接受方,也可以是发送方
|
||||||
|
/// 所以还需要一个结构保存发送时的状态信息
|
||||||
|
pub struct SendStateContext {
|
||||||
|
/// 滑动窗口的左边界指针
|
||||||
|
pub una: u32,
|
||||||
|
/// 存放下一个发送的seq值
|
||||||
|
pub nxt: u32,
|
||||||
|
/// 发送方窗口大小
|
||||||
|
pub wnd: u16,
|
||||||
|
/// 由自己设置的初始发送序列号
|
||||||
|
pub iss: u32,
|
||||||
|
}
|
||||||
|
|
||||||
#[test]
|
pub struct Connection {
|
||||||
fn it_works() {
|
state: State,
|
||||||
let result = add(2, 2);
|
send: SendStateContext,
|
||||||
assert_eq!(result, 4);
|
recv: RecvStateContext,
|
||||||
|
iph: etherparse::Ipv4Header
|
||||||
|
}
|
||||||
|
impl Connection {
|
||||||
|
pub fn on_packet<'a>(
|
||||||
|
&mut self,
|
||||||
|
iph: etherparse::Ipv4HeaderSlice<'a>,
|
||||||
|
tcph: etherparse::TcpHeaderSlice<'a>,
|
||||||
|
data: &'a [u8],
|
||||||
|
) {
|
||||||
|
// 需要检查是否接受
|
||||||
|
// SND.UNA < SEG.ACK <= SND.NXT
|
||||||
|
let ack = tcph.acknowledgment_number();
|
||||||
|
if !is_cyclic_order(self.send.una, ack, self.send.nxt.wrapping_add(1)){
|
||||||
|
eprintln!("不在可接受的范围！");
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
match self.state {
|
||||||
|
State::SynRcvd => {
|
||||||
|
eprintln!("接收到第三次握手包！");
|
||||||
|
|
||||||
|
self.state = State::Estab;
|
||||||
|
},
|
||||||
|
State::Estab => {
|
||||||
|
// 握手结束
|
||||||
|
// TODO: 3:31:04 开始编写结束连接
|
||||||
|
},
|
||||||
|
State::FinWait1 => todo!(),
|
||||||
|
State::FinWait2 => todo!(),
|
||||||
|
State::TimeWait => todo!(),
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub fn accept<'a>(
|
||||||
|
nic: &'a mut tun_tap::Iface,
|
||||||
|
iph: etherparse::Ipv4HeaderSlice<'a>,
|
||||||
|
tcph: etherparse::TcpHeaderSlice<'a>,
|
||||||
|
) -> io::Result<Option<Self>> {
|
||||||
|
let mut buf = [0u8; 1500];
|
||||||
|
// 回应握手包
|
||||||
|
if !tcph.syn() {
|
||||||
|
// 只响应syn数据包
|
||||||
|
return Ok(None);
|
||||||
|
}
|
||||||
|
let iss = 0;
|
||||||
|
let wnd = 1024;
|
||||||
|
let mut c = Connection {
|
||||||
|
state: State::SynRcvd,
|
||||||
|
send: SendStateContext{
|
||||||
|
iss,
|
||||||
|
una: iss,
|
||||||
|
nxt: iss,
|
||||||
|
wnd,
|
||||||
|
},
|
||||||
|
recv: RecvStateContext{
|
||||||
|
irs: tcph.sequence_number(),
|
||||||
|
nxt: tcph.sequence_number() + 1,
|
||||||
|
wnd: tcph.window_size(),
|
||||||
|
},
|
||||||
|
iph: etherparse::Ipv4Header::new(
|
||||||
|
0,
|
||||||
|
64,
|
||||||
|
etherparse::IpNumber::TCP,
|
||||||
|
iph.destination(),
|
||||||
|
iph.source(),
|
||||||
|
).expect("create ip header fail!")
|
||||||
|
};
|
||||||
|
|
||||||
|
// 准备回复SYN+ACK 握手包
|
||||||
|
let mut syn_ack = etherparse::TcpHeader::new(
|
||||||
|
tcph.destination_port(),
|
||||||
|
tcph.source_port(),
|
||||||
|
c.send.iss,
|
||||||
|
10,
|
||||||
|
);
|
||||||
|
// acknowledgment_number 期望接收的下一个字节的序号
|
||||||
|
syn_ack.acknowledgment_number = tcph.sequence_number() + 1;
|
||||||
|
syn_ack.ack = true;
|
||||||
|
syn_ack.syn = true;
|
||||||
|
c.iph.set_payload_len(syn_ack.header_len());
|
||||||
|
let unwritten = {
|
||||||
|
let mut unwritten = &mut buf[..];
|
||||||
|
c.iph.write(&mut unwritten);
|
||||||
|
syn_ack.write(&mut unwritten);
|
||||||
|
unwritten.len()
|
||||||
|
};
|
||||||
|
nic.send(&buf[..unwritten])?;
|
||||||
|
Ok(Some(c))
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
|
/// 判断三个无符号整数是否按顺时针方向形成环形递增顺序
|
||||||
|
///
|
||||||
|
/// # 参数
|
||||||
|
/// - `start`：起始点
|
||||||
|
/// - `middle`：中间点（预期在 `start` 顺时针方向）
|
||||||
|
/// - `end`：终点（预期在 `middle` 顺时针方向）
|
||||||
|
///
|
||||||
|
/// # 返回值
|
||||||
|
/// 如果满足 `start → middle → end` 的顺时针递增顺序（允许溢出环绕），返回 `true`
|
||||||
|
fn is_cyclic_order(start: u32, middle: u32, end: u32) -> bool {
|
||||||
|
// 计算环形空间的最大半值（超过此值代表逆时针方向更短）
|
||||||
|
let half_max_value = u32::MAX / 2 + 1;
|
||||||
|
|
||||||
|
// 计算各点间的顺时针距离（考虑溢出）
|
||||||
|
let start_to_middle_distance = middle.wrapping_sub(start);
|
||||||
|
let middle_to_end_distance = end.wrapping_sub(middle);
|
||||||
|
let start_to_end_distance = end.wrapping_sub(start);
|
||||||
|
|
||||||
|
// 验证条件：
|
||||||
|
// 1. start到middle的顺时针距离不超过半环
|
||||||
|
// 2. middle到end的顺时针距离不超过半环
|
||||||
|
// 3. start到end的总距离等于前两段距离之和（确保连续性）
|
||||||
|
start_to_middle_distance <= half_max_value &&
|
||||||
|
middle_to_end_distance <= half_max_value &&
|
||||||
|
start_to_end_distance == start_to_middle_distance + middle_to_end_distance
|
||||||
|
}
|
||||||
3
tests/test.rs
Normal file
3
tests/test.rs
Normal file
@ -0,0 +1,3 @@
|
|||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
}
|
||||||
84
work.md
Normal file
84
work.md
Normal file
@ -0,0 +1,84 @@
|
|||||||
|
# 开始
|
||||||
|
|
||||||
|
## 架构相关
|
||||||
|
|
||||||
|
### 依赖
|
||||||
|
|
||||||
|
- `tun_tap`: 创建低级网络设备的`crate`。
|
||||||
|
- `tshark`: `wireshark`的终端版本，安装`wireshark`自己会带。
|
||||||
|
- `etherparse`:用来解析`Tcp`和`IP`部分，并且提供了简便访问成员的封装。
|
||||||
|
|
||||||
|
### 传输链路
|
||||||
|
|
||||||
|
```mermaid
|
||||||
|
graph LR
|
||||||
|
A[TUN 接口] --> B(接收 IP 数据包);
|
||||||
|
B --> C{解析 IP 数据包};
|
||||||
|
C --> D[解析 TCP 头部];
|
||||||
|
D --> E[解析 TCP 数据体];
|
||||||
|
E --> F{你的逻辑处理};
|
||||||
|
F --> G[构造 IP 数据包];
|
||||||
|
G --> H[包装 TCP 结构];
|
||||||
|
H --> I(通过 TUN 发送);
|
||||||
|
I --> A;
|
||||||
|
|
||||||
|
style A fill:#f9f,stroke:#333,stroke-width:2px
|
||||||
|
style I fill:#3e89,stroke:#333,stroke-width:2px
|
||||||
|
style F fill:#05aa20,stroke:#333,stroke-width:2px
|
||||||
|
|
||||||
|
classDef process fill:#fffff,stroke:#ffff,stroke-width:1px
|
||||||
|
class C,D,E,G,H process
|
||||||
|
```
|
||||||
|
|
||||||
|
使用`TUN`模式进行低级网络传输。我们从`NIC`中获取到的是一个`IP`数据包。
|
||||||
|
|
||||||
|
具体流程，我们需要先解析这个`IP`数据包，然后解析其中的数据，将它作为`TCP`进行解析，最终我们将我们的数据包装为`IP`数据包，然后传输到`TUN`中，实现通信。
|
||||||
|
|
||||||
|
### 项目测试
|
||||||
|
|
||||||
|
我们在`example/bin.rs`中编写我们的启动测试主程序。`tests`目录主要是用来编写单元测试。
|
||||||
|
|
||||||
|
```bash
|
||||||
|
#!/bin/bash
|
||||||
|
cargo build --example bin -r
|
||||||
|
ext=$?
|
||||||
|
if [[ $ext -ne 0 ]]; then
|
||||||
|
exit $ext
|
||||||
|
fi
|
||||||
|
sudo setcap cap_net_admin=eip ./target/release/examples/bin # 赋予程序网络控制权限，因为要创建tun接口
|
||||||
|
./target/release/examples/bin &
|
||||||
|
pid=$!
|
||||||
|
echo $pid
|
||||||
|
sudo ip addr add 192.168.0.1/24 dev mytun0 # 为我们的虚拟网卡绑定IP和掩码
|
||||||
|
sudo ip link set up dev mytun0 # 激活设备
|
||||||
|
trap "kill $pid" INT TERM
|
||||||
|
wait $pid
|
||||||
|
```
|
||||||
|
|
||||||
|
#### 抓包
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo tshark -i mytun0 # 使用tshark监听mytun0设备
|
||||||
|
```
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
## 开始编写
|
||||||
|
|
||||||
|
### 滑动窗口
|
||||||
|
|
||||||
|
**接受方滑动窗口**
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
**发送方滑动窗口**
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
---
|
||||||
|
|
||||||
|
当发送方接收到`ACK`后，会将`SND.UNA`向右移动。
|
||||||
|
|
||||||
|
而接收方接收到数据包后，会连续的将`RCV.NXT`向右移动，当遇到丢包，就会触发重传。
|
||||||
|
|
||||||
|
需要注意，发送方和接收方都存在窗口大小，当发送方发送消息时，同时收到`接收方滑动窗口大小`和`自身窗口大小`的限制。
|
||||||
Loading…
Reference in New Issue
Block a user