Example #1
0
// Dial dials upstream using domain-fronting.
func (d *dialer) Dial(network, addr string) (net.Conn, error) {
	if !strings.Contains(network, "tcp") {
		return nil, fmt.Errorf("Protocol %s is not supported, only tcp is supported", network)
	}

	return enproxy.Dial(addr, d.enproxyConfig)
}
Example #2
0
// Intercept intercepts a CONNECT request, hijacks the underlying client
// connetion and starts piping the data over a new enproxy.Conn configured using
// this Config.
func (c *ClientHandler) Intercept(resp http.ResponseWriter, req *http.Request) {
	if req.Method != "CONNECT" {
		panic("Intercept used for non-CONNECT request!")
	}

	// Hijack underlying connection
	clientConn, _, err := resp.(http.Hijacker).Hijack()
	if err != nil {
		resp.WriteHeader(502)
		fmt.Fprintf(resp, "Unable to hijack connection: %s", err)
		return
	}
	defer clientConn.Close()

	addr := hostIncludingPort(req, 443)

	// Establish outbound connection
	connOut, err := enproxy.Dial(addr, c.Config)
	if err != nil {
		resp.WriteHeader(502)
		fmt.Fprintf(resp, "Unable to open enproxy connection: %s", err)
		return
	}
	defer connOut.Close()

	// Pipe data
	pipeData(clientConn, connOut, req)
}
Example #3
0
func (d *dialer) HttpClientUsing(masquerade *Masquerade) *http.Client {
	enproxyConfig := d.enproxyConfigWith(func(addr string) (net.Conn, error) {
		return d.dialServerWith(masquerade)
	})

	return &http.Client{
		Transport: &http.Transport{
			Dial: func(network, addr string) (net.Conn, error) {
				return enproxy.Dial(addr, enproxyConfig)
			},
		},
	}
}
Example #4
0
File: host.go Project: 2722/lantern
// resetProxiedClient reconfigures the host so attempts to proxy through it,
// for the sake of checking whether it's up and serving, will use the given
// port.  Valid port values are "443", in which case we'll access the proxy
// through HTTPS, or "80", for an unencrypted connection.
//
// This is necessary because when peerscanner starts up and gets the list of
// hosts from the various DNS/CDN services, it has no way to know what port
// these servers are listening at.  So we want to try both until one works, or
// until the server first registers with peerscanner, advertising which port
// it uses.
func (h *host) resetProxiedClient(port string) {

	var dial func(addr string) (net.Conn, error)
	if port == "80" {
		dial = func(addr string) (net.Conn, error) {
			dialer := net.Dialer{Timeout: dialTimeout}
			return dialer.Dial("tcp", h.ip+":80")
		}
	} else if port == "443" {
		dial = func(addr string) (net.Conn, error) {
			return tlsdialer.DialWithDialer(&net.Dialer{
				Timeout: dialTimeout,
			}, "tcp", h.ip+":443", true, &tls.Config{
				InsecureSkipVerify: true,
				// Cache TLS sessions
				ClientSessionCache: tls.NewLRUClientSessionCache(1000),
			})
		}
	} else {
		log.Errorf("Unsupported port: %v", port)
		return
	}

	h.proxiedClient = &http.Client{
		Transport: &http.Transport{
			Dial: func(network, addr string) (net.Conn, error) {
				return enproxy.Dial(addr, &enproxy.Config{
					DialProxy: dial,
					NewRequest: func(upstreamHost string, method string, body io.Reader) (req *http.Request, err error) {
						return http.NewRequest(method, "http://"+h.ip+"/", body)
					},
					OnFirstResponse: func(resp *http.Response) {
						h.reportedHostMutex.Lock()
						h.reportedHost = resp.Header.Get(enproxy.X_ENPROXY_PROXY_HOST)
						h.reportedHostMutex.Unlock()
					},
				})
			},
			DisableKeepAlives: true,
		},
		Timeout: requestTimeout,
	}
}
Example #5
0
func main() {
	if len(os.Args) < 2 {
		log.Fatal("Usage: client <proxy addr to listen> <proxy server addr>")
	}
	enproxyConfig := &enproxy.Config{
		DialProxy: func(addr string) (net.Conn, error) {
			return net.Dial("tcp", os.Args[2])
		},
		NewRequest: func(host string, method string, body io.Reader) (req *http.Request, err error) {
			if host == "" {
				host = os.Args[2]
			}
			return http.NewRequest(method, "http://"+host+"/", body)
		},
	}
	httpServer := &http.Server{
		Addr: os.Args[1],
		Handler: &ClientHandler{
			ProxyAddr: os.Args[2],
			Config:    enproxyConfig,
			ReverseProxy: &httputil.ReverseProxy{
				Director: func(req *http.Request) {
					// do nothing
				},
				Transport: &http.Transport{
					Dial: func(network string, addr string) (net.Conn, error) {
						return enproxy.Dial(addr, enproxyConfig)
					},
				},
			},
		},
	}
	err := httpServer.ListenAndServe()
	if err != nil {
		log.Fatal(err)
	}
}