mirror of
https://github.com/net-byte/vtun
synced 2024-03-14 10:50:03 +08:00
76 lines
1.6 KiB
Go
76 lines
1.6 KiB
Go
package tcp
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import (
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"io"
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"log"
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"net"
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"time"
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"github.com/net-byte/vtun/common/cache"
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"github.com/net-byte/vtun/common/cipher"
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"github.com/net-byte/vtun/common/config"
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"github.com/net-byte/vtun/common/netutil"
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"github.com/net-byte/vtun/tun"
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"github.com/songgao/water"
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"github.com/songgao/water/waterutil"
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)
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// Start tcp client
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func StartClient(config config.Config) {
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log.Printf("vtun tcp client started on %v", config.LocalAddr)
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iface := tun.CreateTun(config)
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// read data from tun
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packet := make([]byte, config.MTU)
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for {
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n, err := iface.Read(packet)
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if err != nil || n == 0 {
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continue
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}
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b := packet[:n]
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if !waterutil.IsIPv4(b) {
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continue
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}
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srcIPv4, dstIPv4 := netutil.GetIPv4(b)
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if srcIPv4 == "" || dstIPv4 == "" {
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continue
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}
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key := dstIPv4
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var conn net.Conn
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if v, ok := cache.GetCache().Get(key); ok {
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conn = v.(net.Conn)
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} else {
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conn, err = net.DialTimeout("tcp", config.ServerAddr, time.Duration(config.Timeout)*time.Second)
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if conn == nil || err != nil {
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continue
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}
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cache.GetCache().Set(key, conn, 10*time.Minute)
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go tcpToTun(config, key, conn, iface)
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}
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if config.Obfs {
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b = cipher.XOR(b)
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}
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conn.Write(b)
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}
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}
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func tcpToTun(config config.Config, key string, tcpconn net.Conn, iface *water.Interface) {
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defer tcpconn.Close()
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buf := make([]byte, config.MTU)
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for {
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tcpconn.SetReadDeadline(time.Now().Add(time.Duration(config.Timeout) * time.Second))
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n, err := tcpconn.Read(buf)
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if err != nil || err == io.EOF {
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break
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}
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b := buf[:n]
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if config.Obfs {
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b = cipher.XOR(b)
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}
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if !waterutil.IsIPv4(b) {
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continue
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}
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iface.Write(b)
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}
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cache.GetCache().Delete(key)
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}
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