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util.go
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util.go
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package main
import (
"bufio"
//"bytes"
"errors"
"github.com/ginuerzh/gosocks5"
"io"
"log"
"net"
"net/http"
"net/url"
"strconv"
"strings"
)
const (
MethodTLS uint8 = 0x80 + iota
MethodAES128
MethodAES192
MethodAES256
MethodDES
MethodBF
MethodCAST5
MethodRC4MD5
MethodRC4
MethodTable
)
var Methods = map[uint8]string{
gosocks5.MethodNoAuth: "", // 0x00
MethodTLS: "tls", // 0x80
MethodAES128: "aes-128-cfb", // 0x81
MethodAES192: "aes-192-cfb", // 0x82
MethodAES256: "aes-256-cfb", // 0x83
MethodDES: "des-cfb", // 0x84
MethodBF: "bf-cfb", // 0x85
MethodCAST5: "cast5-cfb", // 0x86
MethodRC4MD5: "rc4-md5", // 8x87
MethodRC4: "rc4", // 0x88
MethodTable: "table", // 0x89
}
func ToSocksAddr(addr net.Addr) *gosocks5.Addr {
host, port, _ := net.SplitHostPort(addr.String())
p, _ := strconv.Atoi(port)
return &gosocks5.Addr{
Type: gosocks5.AddrIPv4,
Host: host,
Port: uint16(p),
}
}
func Connect(addr, proxy string) (net.Conn, error) {
if !strings.Contains(addr, ":") {
addr += ":80"
}
if len(proxy) == 0 {
taddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
log.Println(err)
return nil, err
}
return net.DialTCP("tcp", nil, taddr)
}
paddr, err := net.ResolveTCPAddr("tcp", proxy)
if err != nil {
return nil, err
}
pconn, err := net.DialTCP("tcp", nil, paddr)
if err != nil {
log.Println(err)
return nil, err
}
header := http.Header{}
header.Set("Proxy-Connection", "keep-alive")
req := &http.Request{
Method: "CONNECT",
URL: &url.URL{Host: addr},
Host: addr,
Header: header,
}
if err := req.Write(pconn); err != nil {
log.Println(err)
pconn.Close()
return nil, err
}
resp, err := http.ReadResponse(bufio.NewReader(pconn), req)
if err != nil {
log.Println(err)
pconn.Close()
return nil, err
}
if resp.StatusCode != http.StatusOK {
pconn.Close()
return nil, errors.New(resp.Status)
}
return pconn, nil
}
// based on io.Copy
func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
buf := lpool.Take()
defer lpool.put(buf)
for {
nr, er := src.Read(buf)
//log.Println("cp r", nr, er)
if nr > 0 {
nw, ew := dst.Write(buf[:nr])
//log.Println("cp w", nw, ew)
if nw > 0 {
written += int64(nw)
}
if ew != nil {
err = ew
break
}
/*
if nr != nw {
err = io.ErrShortWrite
break
}
*/
}
if er == io.EOF {
break
}
if er != nil {
err = er
break
}
}
return
}
func Pipe(src io.Reader, dst io.Writer, c chan<- error) {
_, err := Copy(dst, src)
c <- err
}
func Transport(conn, conn2 net.Conn) (err error) {
rChan := make(chan error, 1)
wChan := make(chan error, 1)
go Pipe(conn, conn2, wChan)
go Pipe(conn2, conn, rChan)
select {
case err = <-wChan:
//log.Println("w exit", err)
case err = <-rChan:
//log.Println("r exit", err)
}
return
}