0212-使用 dummy 收发数据

环境

• Time 2022-11-20
• WSL-Ubuntu 22.04
• Rust 1.65.0
• pnet 0.31.0

前言

说明

参考：https://docs.rs/pnet_datalink/0.31.0/pnet_datalink/linux

目标

前面使用了 pnet 发送了一个数据包，这里发送一个数据包，然后接收并显示出来。

接收数据

use pnet_datalink::{linux, Channel};

fn main() {
    let interfaces = linux::interfaces();

    let dummy: Vec<_> = interfaces
        .into_iter()
        .filter(|e| e.name == "mydummy")
        .collect();

    let config = linux::Config::default();
    let channel = linux::channel(&dummy[0], config);
    let (mut _sender, mut reader) = match channel {
        Ok(Channel::Ethernet(tx, rx)) => (tx, rx),
        _ => panic!("Not a valid channel returned"),
    };

    let bytes = reader.next().unwrap();
    dbg!(bytes);

    let string = String::from_utf8_lossy(bytes);
    println!("reader: {}", string)
}

发送数据

use pnet_datalink::{linux, Channel};

fn main() {
    let interfaces = linux::interfaces();

    let dummy: Vec<_> = interfaces
        .into_iter()
        .filter(|e| e.name == "mydummy")
        .collect();

    let config = linux::Config::default();
    let channel = linux::channel(&dummy[0], config);
    let (mut sender, mut _reader) = match channel {
        Ok(Channel::Ethernet(tx, rx)) => (tx, rx),
        _ => panic!("Not a valid channel returned"),
    };

    let buffer = String::from("hello, jiangbo");
    sender.send_to(buffer.as_bytes(), None).unwrap().unwrap();
}

tcpdump 的显示

21:09:17.441710 20:6a:69:61:6e:67 (oui Unknown) > 68:65:6c:6c:6f:2c (oui Unknown), ethertype Unknown (0x626f), length 14:

可以看到确实发送了一个数据包

reader 显示

reader: hello, jiangbo

总结

通过 dummy 和 pnet，实现了两个程序之间的数据交换。

附录