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|
// Package client exposes a socks5 proxy that uses obfs4 to communicate with the server,
// with an optional kcp wire transport.
package client
import (
"errors"
"fmt"
"log"
"net"
"sync"
"0xacab.org/leap/obfsvpn"
"github.com/kalikaneko/socks5"
"github.com/xtaci/kcp-go"
)
var (
ErrAlreadyRunning = errors.New("already initialized")
ErrNotRunning = errors.New("server not running")
)
type Client struct {
kcp bool
socksAddr string
obfs4Cert string
server *socks5.Server
started bool
mu sync.Mutex
}
func NewClient(kcp bool, socksAddr, obfs4Cert string) *Client {
return &Client{
kcp: kcp,
socksAddr: socksAddr,
obfs4Cert: obfs4Cert,
}
}
func (c *Client) Start() (bool, error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.server != nil {
log.Printf("Cannot start proxy server if already initialized")
return false, ErrAlreadyRunning
}
c.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, err
}
if c.kcp {
dialer.DialFunc = func(network, address string) (net.Conn, error) {
log.Printf("Dialing kcp://%s\n", address)
return kcp.Dial(address)
}
}
c.server.Dial = dialer.Dial
fmt.Printf("[+] Starting socks5 proxy at %s\n", c.socksAddr)
if err := c.server.ListenAndServe(); err != nil {
log.Printf("error while listening: %v\n", err)
c.server = nil
return false, err
}
c.started = true
return true, nil
}
func (c *Client) Stop() (bool, error) {
c.mu.Lock()
defer c.mu.Unlock()
if c.server == nil {
return false, ErrNotRunning
}
if err := c.server.Close(); err != nil {
log.Printf("error while stopping: %v\n", err)
return false, err
}
c.server = nil
return true, nil
}
func (c *Client) Status() string {
c.mu.Lock()
defer c.mu.Unlock()
switch c.started {
case true:
return "running"
default:
return "stopped"
}
}
|
