mirror of
https://github.com/net-byte/vtun
synced 2024-03-14 10:50:03 +08:00
69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
package udp
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import (
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"log"
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"net"
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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/tun"
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"github.com/songgao/water/waterutil"
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)
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// StartClient starts udp client
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func StartClient(config config.Config) {
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iface := tun.CreateTun(config)
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serverAddr, err := net.ResolveUDPAddr("udp", config.ServerAddr)
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if err != nil {
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log.Fatalln("failed to resolve server addr:", err)
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}
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localAddr, err := net.ResolveUDPAddr("udp", config.LocalAddr)
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if err != nil {
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log.Fatalln("failed to get udp socket:", err)
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}
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conn, err := net.ListenUDP("udp", localAddr)
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if err != nil {
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log.Fatalln("failed to listen on udp socket:", err)
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}
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defer conn.Close()
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log.Printf("vtun udp client started on %v", config.LocalAddr)
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// server -> client
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go func() {
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buf := make([]byte, 1500)
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for {
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n, _, err := conn.ReadFromUDP(buf)
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if err != nil || n == 0 {
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continue
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}
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var b []byte
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if config.Obfuscate {
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b = cipher.XOR(buf[:n])
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} else {
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b = buf[:n]
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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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}()
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// client -> server
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packet := make([]byte, 1500)
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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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if !waterutil.IsIPv4(packet) {
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continue
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}
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var b []byte
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if config.Obfuscate {
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b = cipher.XOR(packet[:n])
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} else {
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b = packet[:n]
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}
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conn.WriteToUDP(b, serverAddr)
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}
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}
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