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package main
import (
"flag"
"fmt"
"io"
"log"
"net"
"os"
"0xacab.org/leap/obfsvpn"
"github.com/kalikaneko/socks5"
"github.com/xtaci/kcp-go"
)
func main() {
// Setup logging.
logger := log.New(os.Stderr, "", log.LstdFlags)
debug := log.New(io.Discard, "DEBUG ", log.LstdFlags)
// setup command line flags.
var (
verbose bool
obfs4Cert string
obfs4Remote string
socksPort string
socksHost string
)
socksPort = "8080"
socksHost = "127.0.0.1"
flags := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
flags.BoolVar(&verbose, "v", verbose, "Enable verbose logging")
flags.StringVar(&obfs4Cert, "c", obfs4Cert, "The remote obfs4 certificate")
flags.StringVar(&obfs4Remote, "r", obfs4Remote, "The remote obfs4 endpoint (ip:port)")
flags.StringVar(&socksPort, "p", socksPort, "The port for the local socks5 proxy (default: 8080)")
flags.StringVar(&socksHost, "i", socksHost, "The host for the local socks5 proxy (default: localhost)")
err := flags.Parse(os.Args[1:])
if err != nil {
logger.Fatalf("error parsing flags: %v", err)
}
// Configure logging.
if verbose {
debug.SetOutput(os.Stderr)
}
kcpTransport := false
// TODO make this configurable via a Config struct
// TODO make sure we're disabling all the crypto options for KCP
if os.Getenv("KCP") == "1" {
kcpTransport = true
}
socksAddr := net.JoinHostPort(socksHost, socksPort)
client := NewClient(kcpTransport, socksAddr, obfs4Cert)
client.Start()
}
type Client struct {
kcp bool
socksAddr string
obfs4Cert string
}
func NewClient(kcp bool, socksAddr, obfs4Cert string) *Client {
return &Client{
kcp: kcp,
socksAddr: socksAddr,
obfs4Cert: obfs4Cert,
}
}
func (c *Client) Start() bool {
server := &socks5.Server{
Addr: c.socksAddr,
BindIP: "127.0.0.1",
}
dialer, err := obfsvpn.NewDialerFromCert(c.obfs4Cert)
if err != nil {
log.Printf("Error getting dialer: %v\n", err)
return false
}
if c.kcp {
dialer.DialFunc = func(network, address string) (net.Conn, error) {
log.Printf("Dialing kcp://%s\n", address)
return kcp.Dial(address)
}
}
server.Dial = dialer.Dial
fmt.Printf("[+] Starting socks5 proxy at %s\n", c.socksAddr)
if err := server.ListenAndServe(); err != nil {
log.Printf("error while listening: %v\n", err)
return false
}
return true
}
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