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golang: tunnel tcp over socks5
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package main | |
import ( | |
"flag" | |
"io" | |
"net" | |
"time" | |
log "github.com/sirupsen/logrus" | |
"golang.org/x/net/proxy" | |
) | |
func pipe(src io.Reader, dst io.WriteCloser, result chan<- int64) { | |
defer dst.Close() | |
n, _ := io.Copy(dst, src) | |
result <- int64(n) | |
} | |
func main() { | |
local := flag.String("local", "127.0.0.1:8388", "address to listen") | |
socks5 := flag.String("proxy", "127.0.0.1:1080", "socks5 proxy") | |
target := flag.String("target", "www.google.com:80", "forwarding target") | |
flag.Parse() | |
lis, err := net.Listen("tcp", *local) | |
if err != nil { | |
log.WithError(err).Fatal("cannot listen") | |
} | |
for { | |
conn, err := lis.Accept() | |
if err != nil { | |
log.WithError(err).Warn("cannot accept") | |
} | |
go func(conn net.Conn) { | |
defer conn.Close() | |
dailer, err := proxy.SOCKS5("tcp", *socks5, nil, &net.Dialer{ | |
Timeout: 60 * time.Second, | |
KeepAlive: 30 * time.Second, | |
}) | |
if err != nil { | |
log.WithError(err).Warn("cannot initialize socks5 proxy") | |
return | |
} | |
c, err := dailer.Dial("tcp", *target) | |
if err != nil { | |
log.WithError(err).WithField("target", *target).Warn("cannot dial") | |
return | |
} | |
up, down := make(chan int64), make(chan int64) | |
go pipe(conn, c, up) | |
go pipe(c, conn, down) | |
<-up | |
<-down | |
return | |
}(conn) | |
} | |
} |
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