forked from eXeC64/gator
/
gator.go
67 lines (53 loc) · 1.08 KB
/
gator.go
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package main
import (
"flag"
"fmt"
"log"
"net"
)
func main() {
port := flag.Int("port", 10080, "port to listen for connections on")
flag.Parse()
address := fmt.Sprintf(":%d", *port)
ln, err := net.Listen("tcp", address)
if err != nil {
log.Printf("Failed to listen on \"%s\" - error: %s", address, err.Error())
return
}
log.Printf("Listening for new connections on %s", address)
for {
c, err := ln.Accept()
if err != nil {
log.Printf("Failed to accept connection: %s", err.Error())
continue
}
go handleConnection(c)
}
}
type SockProxy interface {
Proxy(client net.Conn) error
}
func handleConnection(client net.Conn) {
defer client.Close()
// sock version
ver := make([]byte, 1)
if n, _ := client.Read(ver); n != 1 {
log.Println("MethodRequest packet is too short")
return
}
var proxy SockProxy
switch ver[0] {
case 0x04:
proxy = new(Sock4)
case 0x05:
proxy = new(Sock5)
default:
log.Println("invalid socks version:", ver)
return
}
if err := proxy.Proxy(client); err != nil {
log.Println("Proxy error:", err)
return
}
return
}