合并tun、tap配置，减少重复代码

switch/src/tun_tap_device/linux.rs

@@ -0,0 +1,121 @@
+use std::io;
+use std::net::Ipv4Addr;
+use crate::tun_tap_device::{DeviceReader, DeviceType, DeviceWriter};
+use tun::Device;
+use parking_lot::Mutex;
+use std::process::Command;
+use std::sync::Arc;
+use crate::tun_tap_device::unix::DeviceW;
+
+impl DeviceWriter {
+    pub fn change_ip(&self, address: Ipv4Addr, netmask: Ipv4Addr,
+                     gateway: Ipv4Addr, _old_netmask: Ipv4Addr, _old_gateway: Ipv4Addr) -> io::Result<()> {
+        let mut config = tun::Configuration::default();
+        config
+            .destination(gateway)
+            .address(address)
+            .netmask(netmask)
+            .mtu(1420)
+            // .queues(2)
+            .up();
+        let mut dev = self.lock.lock();
+        if let Err(e) = dev.configure(&config) {
+            return Err(io::Error::new(io::ErrorKind::Other, format!("{:?}", e)));
+        }
+        let name = dev.name();
+        for (address, netmask) in &self.in_ips {
+            add_route(name, *address, *netmask)?;
+        }
+        // 当前网段路由
+        // add_route(name, address, netmask)?;
+        // 广播和组播路由
+        add_route(name, Ipv4Addr::BROADCAST, Ipv4Addr::BROADCAST)?;
+        add_route(name, Ipv4Addr::from([224, 0, 0, 0]), Ipv4Addr::from([240, 0, 0, 0]))?;
+        return Ok(());
+    }
+}
+
+pub fn add_route(name: &str, address: Ipv4Addr, netmask: Ipv4Addr) -> io::Result<()> {
+    let route_add_str: String = format!(
+        "ip route add {:?}/{:?} dev {}",
+        address, netmask, name
+    );
+    let route_add_out = Command::new("sh")
+        .arg("-c")
+        .arg(&route_add_str)
+        .output()
+        .expect("sh exec error!");
+    if !route_add_out.status.success() {
+        return Err(io::Error::new(io::ErrorKind::Other, format!("添加路由失败: cmd:{},out:{:?}", route_add_str, route_add_out)));
+    }
+    Ok(())
+}
+
+pub fn create_device(device_type: DeviceType,
+                     address: Ipv4Addr,
+                     netmask: Ipv4Addr,
+                     gateway: Ipv4Addr,
+                     in_ips: Vec<(Ipv4Addr, Ipv4Addr)>,
+) -> io::Result<(DeviceWriter, DeviceReader)> {
+    println!("========网卡配置========");
+    let mut config = tun::Configuration::default();
+
+    config
+        .destination(gateway)
+        .address(address)
+        .netmask(netmask)
+        .mtu(1420)
+        // .queues(2) 用多个队列有兼容性问题
+        .up();
+    match device_type {
+        DeviceType::Tun => {}
+        DeviceType::Tap => {
+            config.layer(tun::Layer::L2);
+        }
+    }
+    let dev = tun::create(&config).unwrap();
+    let packet_information = dev.has_packet_information();
+    let queue = dev.queue(0).unwrap();
+    let reader = queue.reader();
+    let writer = queue.writer();
+    let name = dev.name();
+    println!("name:{:?}", name);
+    for (address, netmask) in &in_ips {
+        add_route(name, *address, *netmask)?;
+    }
+    // 当前网段路由
+    // add_route(name, address, netmask)?;
+    // 广播和组播路由
+    add_route(name, Ipv4Addr::BROADCAST, Ipv4Addr::BROADCAST)?;
+    add_route(name, Ipv4Addr::from([224, 0, 0, 0]), Ipv4Addr::from([240, 0, 0, 0]))?;
+    let device_w = match device_type {
+        DeviceType::Tun => {
+            DeviceW::Tun(writer)
+        }
+        DeviceType::Tap => {
+            let get_mac_cmd = format!("cat /sys/class/net/{}/address", name);
+            let mac_out = Command::new("sh")
+                .arg("-c")
+                .arg(get_mac_cmd)
+                .output()
+                .expect("sh exec error!");
+            if !mac_out.status.success() {
+                return Err(io::Error::new(io::ErrorKind::Other, format!("获取mac地址错误: {:?}", mac_out)));
+            }
+            let mac_str = String::from_utf8(mac_out.stdout).unwrap();
+            let mut mac = [0; 6];
+            let mut split = mac_str.split(":");
+            for i in 0..6 {
+                mac[i] = u8::from_str_radix(&split.next().unwrap()[..2], 16).unwrap();
+            }
+            DeviceW::Tap((writer, mac))
+        }
+    };
+    println!("========TUN网卡配置========");
+    Ok((
+        DeviceWriter::new(device_w, Arc::new(Mutex::new(dev)), in_ips, address, packet_information),
+        DeviceReader::new(reader),
+    ))
+}
+
+pub fn delete_device(_device_type: DeviceType) {}