mirror of https://github.com/gorilla/websocket.git
Add SOCKS5 support
- Bundle the golang.org/x/net/proxy package to x_net_proxy.go. The package contains a SOCKS5 proxy. The package is bundled to avoid adding a dependency from the weboscket package to golang.org/x/net. - Restructure the existing HTTP proxy code so the code can be used as a dialer with the proxy package. - Modify Dialer.Dial to use proxy.FromURL. - Improve tests (avoid modifying package-level data, use timeouts in tests, use correct proxy URLs in tests). Fixes #297.
This commit is contained in:
Gary Burd
GitHub
parent
8c6cfd493d
commit
b89020ee79
94
client.go
94
client.go
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@ -5,10 +5,8 @@
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package websocket
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import (
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"bufio"
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"bytes"
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"crypto/tls"
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"encoding/base64"
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"errors"
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"io"
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"io/ioutil"
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@ -106,7 +104,7 @@ func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
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return hostPort, hostNoPort
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}
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// DefaultDialer is a dialer with all fields set to the default zero values.
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// DefaultDialer is a dialer with all fields set to the default values.
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var DefaultDialer = &Dialer{
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Proxy: http.ProxyFromEnvironment,
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}
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@ -202,36 +200,52 @@ func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Re
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req.Header.Set("Sec-Websocket-Extensions", "permessage-deflate; server_no_context_takeover; client_no_context_takeover")
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}
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hostPort, hostNoPort := hostPortNoPort(u)
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var proxyURL *url.URL
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// Check wether the proxy method has been configured
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if d.Proxy != nil {
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proxyURL, err = d.Proxy(req)
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}
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if err != nil {
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return nil, nil, err
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}
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var targetHostPort string
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if proxyURL != nil {
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targetHostPort, _ = hostPortNoPort(proxyURL)
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} else {
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targetHostPort = hostPort
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}
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var deadline time.Time
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if d.HandshakeTimeout != 0 {
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deadline = time.Now().Add(d.HandshakeTimeout)
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}
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// Get network dial function.
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netDial := d.NetDial
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if netDial == nil {
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netDialer := &net.Dialer{Deadline: deadline}
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netDial = netDialer.Dial
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}
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netConn, err := netDial("tcp", targetHostPort)
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// If needed, wrap the dial function to set the connection deadline.
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if !deadline.Equal(time.Time{}) {
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forwardDial := netDial
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netDial = func(network, addr string) (net.Conn, error) {
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c, err := forwardDial(network, addr)
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if err != nil {
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return nil, err
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}
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err = c.SetDeadline(deadline)
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if err != nil {
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c.Close()
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return nil, err
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}
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return c, nil
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}
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}
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// If needed, wrap the dial function to connect through a proxy.
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if d.Proxy != nil {
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proxyURL, err := d.Proxy(req)
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if err != nil {
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return nil, nil, err
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}
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if proxyURL != nil {
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dialer, err := proxy_FromURL(proxyURL, netDialerFunc(netDial))
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if err != nil {
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return nil, nil, err
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}
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netDial = dialer.Dial
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}
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}
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hostPort, hostNoPort := hostPortNoPort(u)
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netConn, err := netDial("tcp", hostPort)
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if err != nil {
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return nil, nil, err
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}
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@ -242,42 +256,6 @@ func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Re
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}
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}()
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if err := netConn.SetDeadline(deadline); err != nil {
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return nil, nil, err
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}
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if proxyURL != nil {
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connectHeader := make(http.Header)
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if user := proxyURL.User; user != nil {
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proxyUser := user.Username()
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if proxyPassword, passwordSet := user.Password(); passwordSet {
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credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
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connectHeader.Set("Proxy-Authorization", "Basic "+credential)
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}
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}
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connectReq := &http.Request{
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Method: "CONNECT",
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URL: &url.URL{Opaque: hostPort},
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Host: hostPort,
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Header: connectHeader,
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}
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connectReq.Write(netConn)
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// Read response.
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// Okay to use and discard buffered reader here, because
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// TLS server will not speak until spoken to.
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br := bufio.NewReader(netConn)
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resp, err := http.ReadResponse(br, connectReq)
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if err != nil {
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return nil, nil, err
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}
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if resp.StatusCode != 200 {
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f := strings.SplitN(resp.Status, " ", 2)
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return nil, nil, errors.New(f[1])
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}
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}
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if u.Scheme == "https" {
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cfg := cloneTLSConfig(d.TLSClientConfig)
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if cfg.ServerName == "" {
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@ -5,11 +5,14 @@
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package websocket
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import (
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"bytes"
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"crypto/tls"
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"crypto/x509"
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"encoding/base64"
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"encoding/binary"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"net/http/cookiejar"
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"net/http/httptest"
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@ -31,9 +34,10 @@ var cstUpgrader = Upgrader{
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}
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var cstDialer = Dialer{
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Subprotocols: []string{"p1", "p2"},
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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Subprotocols: []string{"p1", "p2"},
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ReadBufferSize: 1024,
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WriteBufferSize: 1024,
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HandshakeTimeout: 30 * time.Second,
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}
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type cstHandler struct{ *testing.T }
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@ -143,8 +147,9 @@ func TestProxyDial(t *testing.T) {
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s := newServer(t)
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defer s.Close()
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surl, _ := url.Parse(s.URL)
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surl, _ := url.Parse(s.Server.URL)
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cstDialer := cstDialer // make local copy for modification on next line.
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cstDialer.Proxy = http.ProxyURL(surl)
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connect := false
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@ -173,16 +178,16 @@ func TestProxyDial(t *testing.T) {
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}
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defer ws.Close()
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sendRecv(t, ws)
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cstDialer.Proxy = http.ProxyFromEnvironment
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}
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func TestProxyAuthorizationDial(t *testing.T) {
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s := newServer(t)
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defer s.Close()
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surl, _ := url.Parse(s.URL)
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surl, _ := url.Parse(s.Server.URL)
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surl.User = url.UserPassword("username", "password")
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cstDialer := cstDialer // make local copy for modification on next line.
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cstDialer.Proxy = http.ProxyURL(surl)
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connect := false
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@ -213,8 +218,6 @@ func TestProxyAuthorizationDial(t *testing.T) {
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}
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defer ws.Close()
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sendRecv(t, ws)
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cstDialer.Proxy = http.ProxyFromEnvironment
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}
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func TestDial(t *testing.T) {
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@ -518,3 +521,82 @@ func TestDialCompression(t *testing.T) {
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defer ws.Close()
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sendRecv(t, ws)
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}
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func TestSocksProxyDial(t *testing.T) {
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s := newServer(t)
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defer s.Close()
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proxyListener, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("listen failed: %v", err)
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}
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defer proxyListener.Close()
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go func() {
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c1, err := proxyListener.Accept()
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if err != nil {
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t.Errorf("proxy accept failed: %v", err)
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return
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}
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defer c1.Close()
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c1.SetDeadline(time.Now().Add(30 * time.Second))
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buf := make([]byte, 32)
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if _, err := io.ReadFull(c1, buf[:3]); err != nil {
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t.Errorf("read failed: %v", err)
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return
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}
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if want := []byte{5, 1, 0}; !bytes.Equal(want, buf[:len(want)]) {
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t.Errorf("read %x, want %x", buf[:len(want)], want)
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}
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if _, err := c1.Write([]byte{5, 0}); err != nil {
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t.Errorf("write failed: %v", err)
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return
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}
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if _, err := io.ReadFull(c1, buf[:10]); err != nil {
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t.Errorf("read failed: %v", err)
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return
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}
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if want := []byte{5, 1, 0, 1}; !bytes.Equal(want, buf[:len(want)]) {
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t.Errorf("read %x, want %x", buf[:len(want)], want)
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return
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}
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buf[1] = 0
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if _, err := c1.Write(buf[:10]); err != nil {
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t.Errorf("write failed: %v", err)
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return
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}
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ip := net.IP(buf[4:8])
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port := binary.BigEndian.Uint16(buf[8:10])
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c2, err := net.DialTCP("tcp", nil, &net.TCPAddr{IP: ip, Port: int(port)})
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if err != nil {
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t.Errorf("dial failed; %v", err)
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return
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}
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defer c2.Close()
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done := make(chan struct{})
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go func() {
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io.Copy(c1, c2)
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close(done)
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}()
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io.Copy(c2, c1)
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<-done
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}()
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purl, err := url.Parse("socks5://" + proxyListener.Addr().String())
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if err != nil {
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t.Fatalf("parse failed: %v", err)
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}
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cstDialer := cstDialer // make local copy for modification on next line.
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cstDialer.Proxy = http.ProxyURL(purl)
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ws, _, err := cstDialer.Dial(s.URL, nil)
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if err != nil {
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t.Fatalf("Dial: %v", err)
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}
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defer ws.Close()
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sendRecv(t, ws)
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}
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@ -0,0 +1,77 @@
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// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package websocket
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import (
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"bufio"
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"encoding/base64"
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"errors"
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"net"
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"net/http"
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"net/url"
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"strings"
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)
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type netDialerFunc func(netowrk, addr string) (net.Conn, error)
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func (fn netDialerFunc) Dial(network, addr string) (net.Conn, error) {
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return fn(network, addr)
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}
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func init() {
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proxy_RegisterDialerType("http", func(proxyURL *url.URL, forwardDialer proxy_Dialer) (proxy_Dialer, error) {
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return &httpProxyDialer{proxyURL: proxyURL, fowardDial: forwardDialer.Dial}, nil
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})
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}
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type httpProxyDialer struct {
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proxyURL *url.URL
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fowardDial func(network, addr string) (net.Conn, error)
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}
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func (hpd *httpProxyDialer) Dial(network string, addr string) (net.Conn, error) {
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hostPort, _ := hostPortNoPort(hpd.proxyURL)
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conn, err := hpd.fowardDial(network, hostPort)
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if err != nil {
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return nil, err
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}
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connectHeader := make(http.Header)
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if user := hpd.proxyURL.User; user != nil {
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proxyUser := user.Username()
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if proxyPassword, passwordSet := user.Password(); passwordSet {
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credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
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connectHeader.Set("Proxy-Authorization", "Basic "+credential)
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}
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}
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connectReq := &http.Request{
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Method: "CONNECT",
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URL: &url.URL{Opaque: addr},
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Host: addr,
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Header: connectHeader,
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}
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if err := connectReq.Write(conn); err != nil {
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conn.Close()
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return nil, err
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}
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// Read response. It's OK to use and discard buffered reader here becaue
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// the remote server does not speak until spoken to.
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br := bufio.NewReader(conn)
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resp, err := http.ReadResponse(br, connectReq)
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if err != nil {
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conn.Close()
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return nil, err
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}
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if resp.StatusCode != 200 {
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conn.Close()
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f := strings.SplitN(resp.Status, " ", 2)
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return nil, errors.New(f[1])
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}
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return conn, nil
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}
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@ -0,0 +1,473 @@
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// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
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//go:generate bundle -o x_net_proxy.go golang.org/x/net/proxy
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// Package proxy provides support for a variety of protocols to proxy network
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// data.
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//
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package websocket
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import (
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"errors"
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"io"
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"net"
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"net/url"
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"os"
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"strconv"
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"strings"
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"sync"
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)
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type proxy_direct struct{}
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// Direct is a direct proxy: one that makes network connections directly.
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var proxy_Direct = proxy_direct{}
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func (proxy_direct) Dial(network, addr string) (net.Conn, error) {
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return net.Dial(network, addr)
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}
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// A PerHost directs connections to a default Dialer unless the host name
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// requested matches one of a number of exceptions.
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type proxy_PerHost struct {
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def, bypass proxy_Dialer
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bypassNetworks []*net.IPNet
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bypassIPs []net.IP
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bypassZones []string
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bypassHosts []string
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}
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// NewPerHost returns a PerHost Dialer that directs connections to either
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// defaultDialer or bypass, depending on whether the connection matches one of
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// the configured rules.
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func proxy_NewPerHost(defaultDialer, bypass proxy_Dialer) *proxy_PerHost {
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return &proxy_PerHost{
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def: defaultDialer,
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bypass: bypass,
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}
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}
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// Dial connects to the address addr on the given network through either
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// defaultDialer or bypass.
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func (p *proxy_PerHost) Dial(network, addr string) (c net.Conn, err error) {
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host, _, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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return p.dialerForRequest(host).Dial(network, addr)
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}
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func (p *proxy_PerHost) dialerForRequest(host string) proxy_Dialer {
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if ip := net.ParseIP(host); ip != nil {
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for _, net := range p.bypassNetworks {
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if net.Contains(ip) {
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return p.bypass
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}
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}
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for _, bypassIP := range p.bypassIPs {
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if bypassIP.Equal(ip) {
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return p.bypass
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}
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}
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return p.def
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}
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for _, zone := range p.bypassZones {
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if strings.HasSuffix(host, zone) {
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return p.bypass
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}
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if host == zone[1:] {
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// For a zone ".example.com", we match "example.com"
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// too.
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return p.bypass
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}
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}
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for _, bypassHost := range p.bypassHosts {
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if bypassHost == host {
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return p.bypass
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}
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}
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return p.def
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}
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// AddFromString parses a string that contains comma-separated values
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// specifying hosts that should use the bypass proxy. Each value is either an
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// IP address, a CIDR range, a zone (*.example.com) or a host name
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// (localhost). A best effort is made to parse the string and errors are
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// ignored.
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func (p *proxy_PerHost) AddFromString(s string) {
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hosts := strings.Split(s, ",")
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for _, host := range hosts {
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host = strings.TrimSpace(host)
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if len(host) == 0 {
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continue
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}
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if strings.Contains(host, "/") {
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// We assume that it's a CIDR address like 127.0.0.0/8
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if _, net, err := net.ParseCIDR(host); err == nil {
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p.AddNetwork(net)
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}
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continue
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}
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if ip := net.ParseIP(host); ip != nil {
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p.AddIP(ip)
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continue
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}
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if strings.HasPrefix(host, "*.") {
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p.AddZone(host[1:])
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continue
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}
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p.AddHost(host)
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}
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}
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|
||||
// AddIP specifies an IP address that will use the bypass proxy. Note that
|
||||
// this will only take effect if a literal IP address is dialed. A connection
|
||||
// to a named host will never match an IP.
|
||||
func (p *proxy_PerHost) AddIP(ip net.IP) {
|
||||
p.bypassIPs = append(p.bypassIPs, ip)
|
||||
}
|
||||
|
||||
// AddNetwork specifies an IP range that will use the bypass proxy. Note that
|
||||
// this will only take effect if a literal IP address is dialed. A connection
|
||||
// to a named host will never match.
|
||||
func (p *proxy_PerHost) AddNetwork(net *net.IPNet) {
|
||||
p.bypassNetworks = append(p.bypassNetworks, net)
|
||||
}
|
||||
|
||||
// AddZone specifies a DNS suffix that will use the bypass proxy. A zone of
|
||||
// "example.com" matches "example.com" and all of its subdomains.
|
||||
func (p *proxy_PerHost) AddZone(zone string) {
|
||||
if strings.HasSuffix(zone, ".") {
|
||||
zone = zone[:len(zone)-1]
|
||||
}
|
||||
if !strings.HasPrefix(zone, ".") {
|
||||
zone = "." + zone
|
||||
}
|
||||
p.bypassZones = append(p.bypassZones, zone)
|
||||
}
|
||||
|
||||
// AddHost specifies a host name that will use the bypass proxy.
|
||||
func (p *proxy_PerHost) AddHost(host string) {
|
||||
if strings.HasSuffix(host, ".") {
|
||||
host = host[:len(host)-1]
|
||||
}
|
||||
p.bypassHosts = append(p.bypassHosts, host)
|
||||
}
|
||||
|
||||
// A Dialer is a means to establish a connection.
|
||||
type proxy_Dialer interface {
|
||||
// Dial connects to the given address via the proxy.
|
||||
Dial(network, addr string) (c net.Conn, err error)
|
||||
}
|
||||
|
||||
// Auth contains authentication parameters that specific Dialers may require.
|
||||
type proxy_Auth struct {
|
||||
User, Password string
|
||||
}
|
||||
|
||||
// FromEnvironment returns the dialer specified by the proxy related variables in
|
||||
// the environment.
|
||||
func proxy_FromEnvironment() proxy_Dialer {
|
||||
allProxy := proxy_allProxyEnv.Get()
|
||||
if len(allProxy) == 0 {
|
||||
return proxy_Direct
|
||||
}
|
||||
|
||||
proxyURL, err := url.Parse(allProxy)
|
||||
if err != nil {
|
||||
return proxy_Direct
|
||||
}
|
||||
proxy, err := proxy_FromURL(proxyURL, proxy_Direct)
|
||||
if err != nil {
|
||||
return proxy_Direct
|
||||
}
|
||||
|
||||
noProxy := proxy_noProxyEnv.Get()
|
||||
if len(noProxy) == 0 {
|
||||
return proxy
|
||||
}
|
||||
|
||||
perHost := proxy_NewPerHost(proxy, proxy_Direct)
|
||||
perHost.AddFromString(noProxy)
|
||||
return perHost
|
||||
}
|
||||
|
||||
// proxySchemes is a map from URL schemes to a function that creates a Dialer
|
||||
// from a URL with such a scheme.
|
||||
var proxy_proxySchemes map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error)
|
||||
|
||||
// RegisterDialerType takes a URL scheme and a function to generate Dialers from
|
||||
// a URL with that scheme and a forwarding Dialer. Registered schemes are used
|
||||
// by FromURL.
|
||||
func proxy_RegisterDialerType(scheme string, f func(*url.URL, proxy_Dialer) (proxy_Dialer, error)) {
|
||||
if proxy_proxySchemes == nil {
|
||||
proxy_proxySchemes = make(map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error))
|
||||
}
|
||||
proxy_proxySchemes[scheme] = f
|
||||
}
|
||||
|
||||
// FromURL returns a Dialer given a URL specification and an underlying
|
||||
// Dialer for it to make network requests.
|
||||
func proxy_FromURL(u *url.URL, forward proxy_Dialer) (proxy_Dialer, error) {
|
||||
var auth *proxy_Auth
|
||||
if u.User != nil {
|
||||
auth = new(proxy_Auth)
|
||||
auth.User = u.User.Username()
|
||||
if p, ok := u.User.Password(); ok {
|
||||
auth.Password = p
|
||||
}
|
||||
}
|
||||
|
||||
switch u.Scheme {
|
||||
case "socks5":
|
||||
return proxy_SOCKS5("tcp", u.Host, auth, forward)
|
||||
}
|
||||
|
||||
// If the scheme doesn't match any of the built-in schemes, see if it
|
||||
// was registered by another package.
|
||||
if proxy_proxySchemes != nil {
|
||||
if f, ok := proxy_proxySchemes[u.Scheme]; ok {
|
||||
return f(u, forward)
|
||||
}
|
||||
}
|
||||
|
||||
return nil, errors.New("proxy: unknown scheme: " + u.Scheme)
|
||||
}
|
||||
|
||||
var (
|
||||
proxy_allProxyEnv = &proxy_envOnce{
|
||||
names: []string{"ALL_PROXY", "all_proxy"},
|
||||
}
|
||||
proxy_noProxyEnv = &proxy_envOnce{
|
||||
names: []string{"NO_PROXY", "no_proxy"},
|
||||
}
|
||||
)
|
||||
|
||||
// envOnce looks up an environment variable (optionally by multiple
|
||||
// names) once. It mitigates expensive lookups on some platforms
|
||||
// (e.g. Windows).
|
||||
// (Borrowed from net/http/transport.go)
|
||||
type proxy_envOnce struct {
|
||||
names []string
|
||||
once sync.Once
|
||||
val string
|
||||
}
|
||||
|
||||
func (e *proxy_envOnce) Get() string {
|
||||
e.once.Do(e.init)
|
||||
return e.val
|
||||
}
|
||||
|
||||
func (e *proxy_envOnce) init() {
|
||||
for _, n := range e.names {
|
||||
e.val = os.Getenv(n)
|
||||
if e.val != "" {
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address
|
||||
// with an optional username and password. See RFC 1928 and RFC 1929.
|
||||
func proxy_SOCKS5(network, addr string, auth *proxy_Auth, forward proxy_Dialer) (proxy_Dialer, error) {
|
||||
s := &proxy_socks5{
|
||||
network: network,
|
||||
addr: addr,
|
||||
forward: forward,
|
||||
}
|
||||
if auth != nil {
|
||||
s.user = auth.User
|
||||
s.password = auth.Password
|
||||
}
|
||||
|
||||
return s, nil
|
||||
}
|
||||
|
||||
type proxy_socks5 struct {
|
||||
user, password string
|
||||
network, addr string
|
||||
forward proxy_Dialer
|
||||
}
|
||||
|
||||
const proxy_socks5Version = 5
|
||||
|
||||
const (
|
||||
proxy_socks5AuthNone = 0
|
||||
proxy_socks5AuthPassword = 2
|
||||
)
|
||||
|
||||
const proxy_socks5Connect = 1
|
||||
|
||||
const (
|
||||
proxy_socks5IP4 = 1
|
||||
proxy_socks5Domain = 3
|
||||
proxy_socks5IP6 = 4
|
||||
)
|
||||
|
||||
var proxy_socks5Errors = []string{
|
||||
"",
|
||||
"general failure",
|
||||
"connection forbidden",
|
||||
"network unreachable",
|
||||
"host unreachable",
|
||||
"connection refused",
|
||||
"TTL expired",
|
||||
"command not supported",
|
||||
"address type not supported",
|
||||
}
|
||||
|
||||
// Dial connects to the address addr on the given network via the SOCKS5 proxy.
|
||||
func (s *proxy_socks5) Dial(network, addr string) (net.Conn, error) {
|
||||
switch network {
|
||||
case "tcp", "tcp6", "tcp4":
|
||||
default:
|
||||
return nil, errors.New("proxy: no support for SOCKS5 proxy connections of type " + network)
|
||||
}
|
||||
|
||||
conn, err := s.forward.Dial(s.network, s.addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if err := s.connect(conn, addr); err != nil {
|
||||
conn.Close()
|
||||
return nil, err
|
||||
}
|
||||
return conn, nil
|
||||
}
|
||||
|
||||
// connect takes an existing connection to a socks5 proxy server,
|
||||
// and commands the server to extend that connection to target,
|
||||
// which must be a canonical address with a host and port.
|
||||
func (s *proxy_socks5) connect(conn net.Conn, target string) error {
|
||||
host, portStr, err := net.SplitHostPort(target)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
port, err := strconv.Atoi(portStr)
|
||||
if err != nil {
|
||||
return errors.New("proxy: failed to parse port number: " + portStr)
|
||||
}
|
||||
if port < 1 || port > 0xffff {
|
||||
return errors.New("proxy: port number out of range: " + portStr)
|
||||
}
|
||||
|
||||
// the size here is just an estimate
|
||||
buf := make([]byte, 0, 6+len(host))
|
||||
|
||||
buf = append(buf, proxy_socks5Version)
|
||||
if len(s.user) > 0 && len(s.user) < 256 && len(s.password) < 256 {
|
||||
buf = append(buf, 2 /* num auth methods */, proxy_socks5AuthNone, proxy_socks5AuthPassword)
|
||||
} else {
|
||||
buf = append(buf, 1 /* num auth methods */, proxy_socks5AuthNone)
|
||||
}
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
if buf[0] != 5 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
|
||||
}
|
||||
if buf[1] == 0xff {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
|
||||
}
|
||||
|
||||
// See RFC 1929
|
||||
if buf[1] == proxy_socks5AuthPassword {
|
||||
buf = buf[:0]
|
||||
buf = append(buf, 1 /* password protocol version */)
|
||||
buf = append(buf, uint8(len(s.user)))
|
||||
buf = append(buf, s.user...)
|
||||
buf = append(buf, uint8(len(s.password)))
|
||||
buf = append(buf, s.password...)
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if buf[1] != 0 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
|
||||
}
|
||||
}
|
||||
|
||||
buf = buf[:0]
|
||||
buf = append(buf, proxy_socks5Version, proxy_socks5Connect, 0 /* reserved */)
|
||||
|
||||
if ip := net.ParseIP(host); ip != nil {
|
||||
if ip4 := ip.To4(); ip4 != nil {
|
||||
buf = append(buf, proxy_socks5IP4)
|
||||
ip = ip4
|
||||
} else {
|
||||
buf = append(buf, proxy_socks5IP6)
|
||||
}
|
||||
buf = append(buf, ip...)
|
||||
} else {
|
||||
if len(host) > 255 {
|
||||
return errors.New("proxy: destination host name too long: " + host)
|
||||
}
|
||||
buf = append(buf, proxy_socks5Domain)
|
||||
buf = append(buf, byte(len(host)))
|
||||
buf = append(buf, host...)
|
||||
}
|
||||
buf = append(buf, byte(port>>8), byte(port))
|
||||
|
||||
if _, err := conn.Write(buf); err != nil {
|
||||
return errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
if _, err := io.ReadFull(conn, buf[:4]); err != nil {
|
||||
return errors.New("proxy: failed to read connect reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
failure := "unknown error"
|
||||
if int(buf[1]) < len(proxy_socks5Errors) {
|
||||
failure = proxy_socks5Errors[buf[1]]
|
||||
}
|
||||
|
||||
if len(failure) > 0 {
|
||||
return errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
|
||||
}
|
||||
|
||||
bytesToDiscard := 0
|
||||
switch buf[3] {
|
||||
case proxy_socks5IP4:
|
||||
bytesToDiscard = net.IPv4len
|
||||
case proxy_socks5IP6:
|
||||
bytesToDiscard = net.IPv6len
|
||||
case proxy_socks5Domain:
|
||||
_, err := io.ReadFull(conn, buf[:1])
|
||||
if err != nil {
|
||||
return errors.New("proxy: failed to read domain length from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
bytesToDiscard = int(buf[0])
|
||||
default:
|
||||
return errors.New("proxy: got unknown address type " + strconv.Itoa(int(buf[3])) + " from SOCKS5 proxy at " + s.addr)
|
||||
}
|
||||
|
||||
if cap(buf) < bytesToDiscard {
|
||||
buf = make([]byte, bytesToDiscard)
|
||||
} else {
|
||||
buf = buf[:bytesToDiscard]
|
||||
}
|
||||
if _, err := io.ReadFull(conn, buf); err != nil {
|
||||
return errors.New("proxy: failed to read address from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
// Also need to discard the port number
|
||||
if _, err := io.ReadFull(conn, buf[:2]); err != nil {
|
||||
return errors.New("proxy: failed to read port from SOCKS5 proxy at " + s.addr + ": " + err.Error())
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in New Issue