skip upstream agent resolve

handler.go

@@ -2,36 +2,51 @@ package main
 
 import (
 	"bufio"
+	"context"
 	"crypto/tls"
+	"fmt"
 	"io"
+	"net"
 	"net/http"
 	"net/http/httputil"
-	"net/url"
 	"strings"
+	"time"
 )
 
 type AuthProvider func() string
 
 type ProxyHandler struct {
 	auth          AuthProvider
-	upstream      string
+	upstreamAddr  string
+	tlsName       string
 	logger        *CondLogger
+	dialer        *net.Dialer
 	httptransport http.RoundTripper
 	resolver      *Resolver
 }
 
-func NewProxyHandler(upstream string, auth AuthProvider, resolver *Resolver, logger *CondLogger) *ProxyHandler {
-	proxyurl, err := url.Parse("https://" + upstream)
-	if err != nil {
-		panic(err)
+func NewProxyHandler(upstream *Endpoint, auth AuthProvider, resolver *Resolver, logger *CondLogger) *ProxyHandler {
+	dialer := &net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
 	}
+	netaddr := net.JoinHostPort(upstream.Host, fmt.Sprintf("%d", upstream.Port))
 	httptransport := &http.Transport{
-		Proxy: http.ProxyURL(proxyurl),
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+		Proxy:                 http.ProxyURL(upstream.URL()),
+		DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
+			return dialer.DialContext(ctx, "tcp", netaddr)
+		},
 	}
 	return &ProxyHandler{
 		auth:          auth,
-		upstream:      upstream,
+		upstreamAddr:  netaddr,
+		tlsName:       upstream.TLSName,
 		logger:        logger,
+		dialer:        dialer,
 		httptransport: httptransport,
 		resolver:      resolver,
 	}
@@ -48,17 +63,25 @@ func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 			return
 		}
 
-		conn, err := tls.Dial("tcp", s.upstream, nil)
+		conn, err := s.dialer.DialContext(req.Context(), "tcp", s.upstreamAddr)
 		if err != nil {
-			s.logger.Error("Can't dial tls upstream: %v", err)
-			http.Error(wr, "Can't dial tls upstream", http.StatusBadGateway)
+			s.logger.Error("Can't dial upstream: %v", err)
+			http.Error(wr, "Can't dial upstream", http.StatusBadGateway)
 			return
 		}
+		defer conn.Close()
+
+		if s.tlsName != "" {
+			conn = tls.Client(conn, &tls.Config{
+				ServerName: s.tlsName,
+			})
+			defer conn.Close()
+		}
 
 		_, err = conn.Write(rawreq)
 		if err != nil {
-			s.logger.Error("Can't write tls upstream: %v", err)
-			http.Error(wr, "Can't write tls upstream", http.StatusBadGateway)
+			s.logger.Error("Can't write upstream: %v", err)
+			http.Error(wr, "Can't write upstream", http.StatusBadGateway)
 			return
 		}
 		bufrd := bufio.NewReader(conn)
@@ -74,14 +97,22 @@ func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 			proxyResp.Header.Get("X-Hola-Error") == "Forbidden Host" {
 			s.logger.Info("Request %s denied by upstream. Rescuing it with resolve&rewrite workaround.",
 				req.URL.String())
-			conn.Close()
-			conn, err = tls.Dial("tcp", s.upstream, nil)
+
+			conn, err = s.dialer.DialContext(req.Context(), "tcp", s.upstreamAddr)
 			if err != nil {
-				s.logger.Error("Can't dial tls upstream: %v", err)
-				http.Error(wr, "Can't dial tls upstream", http.StatusBadGateway)
+				s.logger.Error("Can't dial upstream: %v", err)
+				http.Error(wr, "Can't dial upstream", http.StatusBadGateway)
 				return
 			}
 			defer conn.Close()
+
+			if s.tlsName != "" {
+				conn = tls.Client(conn, &tls.Config{
+					ServerName: s.tlsName,
+				})
+				defer conn.Close()
+			}
+
 			err = rewriteConnectReq(req, s.resolver)
 			if err != nil {
 				s.logger.Error("Can't rewrite request: %v", err)
@@ -101,7 +132,6 @@ func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 				return
 			}
 		} else {
-			defer conn.Close()
 			responseBytes, err = httputil.DumpResponse(proxyResp, false)
 			if err != nil {
 				s.logger.Error("Can't dump response: %v", err)
@@ -160,8 +190,8 @@ func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 			proxyReq.Header.Set("Proxy-Authorization", s.auth())
 			rawreq, _ := httputil.DumpRequest(proxyReq, false)
 
-			// Prepare upstream TLS conn
-			conn, err := tls.Dial("tcp", s.upstream, nil)
+			// Prepare upstream conn
+			conn, err := s.dialer.DialContext(req.Context(), "tcp", s.upstreamAddr)
 			if err != nil {
 				s.logger.Error("Can't dial tls upstream: %v", err)
 				http.Error(wr, "Can't dial tls upstream", http.StatusBadGateway)
@@ -169,6 +199,13 @@ func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 			}
 			defer conn.Close()
 
+			if s.tlsName != "" {
+				conn = tls.Client(conn, &tls.Config{
+					ServerName: s.tlsName,
+				})
+				defer conn.Close()
+			}
+
 			// Send proxy request
 			_, err = conn.Write(rawreq)
 			if err != nil {

holaapi.go

@@ -106,9 +106,9 @@ func (c *FallbackConfig) ShuffleAgents() {
 
 func (c *FallbackConfig) Clone() *FallbackConfig {
 	return &FallbackConfig{
-		Agents: append([]FallbackAgent(nil), c.Agents...),
+		Agents:    append([]FallbackAgent(nil), c.Agents...),
 		UpdatedAt: c.UpdatedAt,
-		TTL: c.TTL,
+		TTL:       c.TTL,
 	}
 }
 
@@ -338,7 +338,7 @@ func httpClientWithProxy(agent *FallbackAgent) *http.Client {
 		t.Proxy = http.ProxyURL(agent.ToProxy())
 		addr := net.JoinHostPort(agent.IP, fmt.Sprintf("%d", agent.Port))
 		t.DialContext = func(ctx context.Context, _, _ string) (net.Conn, error) {
-			return dialer.DialContext(ctx, "tcp4", addr)
+			return dialer.DialContext(ctx, "tcp", addr)
 		}
 	}
 	return &http.Client{

utils.go

@@ -18,6 +18,26 @@ import (
 	"time"
 )
 
+type Endpoint struct {
+	Host    string
+	Port    uint16
+	TLSName string
+}
+
+func (e *Endpoint) URL() *url.URL {
+	if e.TLSName == "" {
+		return &url.URL{
+			Scheme: "http",
+			Host:   net.JoinHostPort(e.Host, fmt.Sprintf("%d", e.Port)),
+		}
+	} else {
+		return &url.URL{
+			Scheme: "https",
+			Host:   net.JoinHostPort(e.TLSName, fmt.Sprintf("%d", e.Port)),
+		}
+	}
+}
+
 func basic_auth_header(login, password string) string {
 	return "basic " + base64.StdEncoding.EncodeToString(
 		[]byte(login+":"+password))
@@ -123,14 +143,15 @@ func print_proxies(country string, proxy_type string, limit uint, timeout time.D
 	return 0
 }
 
-func get_endpoint(tunnels *ZGetTunnelsResponse, typ string, trial bool, force_port_field string) (string, error) {
-	var hostname string
-	for k := range tunnels.IPList {
+func get_endpoint(tunnels *ZGetTunnelsResponse, typ string, trial bool, force_port_field string) (*Endpoint, error) {
+	var hostname, ip string
+	for k, v := range tunnels.IPList {
 		hostname = k
+		ip = v
 		break
 	}
-	if hostname == "" {
-		return "", errors.New("No tunnels found in API response")
+	if hostname == "" || ip == "" {
+		return nil, errors.New("No tunnels found in API response")
 	}
 
 	var port uint16
@@ -157,10 +178,14 @@ func get_endpoint(tunnels *ZGetTunnelsResponse, typ string, trial bool, force_po
 				port = tunnels.Port.Peer
 			}
 		} else {
-			return "", errors.New("Unsupported port type")
+			return nil, errors.New("Unsupported port type")
 		}
 	}
-	return net.JoinHostPort(hostname, strconv.FormatUint(uint64(port), 10)), nil
+	return &Endpoint{
+		Host:    ip,
+		Port:    port,
+		TLSName: hostname,
+	}, nil
 }
 
 // Hop-by-hop headers. These are removed when sent to the backend.