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proxy.go
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proxy.go
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package main
import (
"encoding/binary"
"fmt"
"net"
"time"
)
const VER_5 = 0x05
const NO_AUTH = 0x00
const GSSAPI = 0x01
const USER_PASS = 0x02
const NO_METHOD = 0xff
func err(e error) {
if e != nil {
fmt.Println(e)
}
}
func get_addr_port(request []byte) ([]byte, []byte) {
/*
+----+-----+-------+------+----------+----------+
|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
+----+-----+-------+------+----------+----------+
| 1 | 1 | X'00' | 1 | Variable | 2 |
+----+-----+-------+------+----------+----------+
*/
addr := make([]byte, len(request)-6)
port := make([]byte, 2)
addr = request[5 : len(request)-2]
port = request[len(request)-2:]
return addr, port
}
func handle_new_connection(conn net.Conn) {
//defer conn.Close()
msg := make([]byte, 100)
_, e := conn.Read(msg)
err(e)
//fmt.Println(msg)
if msg[0] != VER_5 {
panic("Invalid version")
}
method := msg[2]
switch method {
case NO_AUTH:
{
establish_connection(conn, NO_AUTH)
}
default:
panic("Method not supported")
}
}
func establish_connection(conn net.Conn, method int) {
conn.Write([]byte{VER_5, byte(method)})
request := make([]byte, 100)
req_len, _ := conn.Read(request)
ln, e := net.Listen("tcp", "localhost:42412")
err(e)
for {
conn, e := ln.Accept()
err(e)
go func(conn net.Conn) {
fmt.Println("New connection")
}(conn)
}
addr, port := get_addr_port(request[:req_len])
p := []byte{0xac, 0xa5}
conn.Write(append(append([]byte{VER_5, 0x0, 0x0, 0x3}, []byte("localhost")...), p...))
/*
dst_conn, _ := net.Dial("tcp", "www.google.com:8080")
fmt.Fprintf(dst_conn, "GET / HTTP/1.0\r\n\r\n")
*/
fmt.Println(addr, string(addr), binary.BigEndian.Uint16(port))
remote_addr := string(addr) + ":" + "80"
res := make([]byte, 1000000)
conn2, e := net.DialTimeout("tcp", remote_addr, 3*time.Second)
//fmt.Println(request)
err(e)
fmt.Fprintf(conn2, "GET / HTTP/1.0\r\n\r\n")
_, readerr := conn2.Read(res)
err(readerr)
conn.Write(res)
fmt.Println(string(res))
}
func main() {
ln, e := net.Listen("tcp", "localhost:1080")
err(e)
for {
conn, e := ln.Accept()
err(e)
go handle_new_connection(conn)
}
}