#69 KCP client now supports proxy chain

README.md

@@ -38,25 +38,25 @@ scheme分为两部分: protocol+transport
 
 protocol: 代理协议类型(http, socks5, shadowsocks), transport: 数据传输方式(ws, wss, tls, http2, quic, kcp), 二者可以任意组合，或单独使用:
 
-> http - 作为HTTP代理: http://:8080
+> http - HTTP代理: http://:8080
 
-> http+tls - 作为HTTPS代理(可能需要提供受信任的证书): http+tls://:443
+> http+tls - HTTPS代理(可能需要提供受信任的证书): http+tls://:443或https://:443
 
-> http2 - 作为HTTP2代理并向下兼容HTTPS代理: http2://:443
+> http2 - HTTP2代理并向下兼容HTTPS代理: http2://:443
 
-> socks - 作为标准SOCKS5代理(支持tls协商加密): socks://:1080
+> socks - 标准SOCKS5代理(支持tls协商加密): socks://:1080
 
-> socks+wss - 作为SOCKS5代理，使用websocket传输数据: socks+wss://:1080
+> socks+wss - SOCKS5代理，使用websocket传输数据: socks+wss://:1080
 
-> tls - 作为HTTPS/SOCKS5代理，使用tls传输数据: tls://:443
+> tls - HTTPS/SOCKS5代理，使用tls传输数据: tls://:443
 
-> ss - 作为Shadowsocks服务，ss://aes-256-cfb:123456@:8338
+> ss - Shadowsocks代理，ss://aes-256-cfb:123456@:8338
 
-> quic - 作为QUIC代理，quic://:6121
+> quic - QUIC代理，quic://:6121
 
-> kcp - 作为KCP代理，kcp://:8388或kcp://aes:123456@:8388
+> kcp - KCP代理，kcp://:8388或kcp://aes:123456@:8388
 
-> redirect - 作为透明代理，redirect://:12345
+> redirect - 透明代理，redirect://:12345
 
 #### 端口转发
 
@@ -251,7 +251,6 @@ gost -L=kcp://:8388?c=/path/to/conf/file
 ```
 
 **注：** 客户端若要开启KCP转发，当且仅当代理链不为空且首个代理节点(第一个-F参数)为kcp类型。
-当KCP转发开启，代理链中的其他代理节点将被忽略。
 
 #### 透明代理
 基于iptables的透明代理。

README_en.md

@@ -40,7 +40,7 @@ transport: data transmission mode (ws, wss, tls, http2, quic, kcp), may be used
 
 > http - standard HTTP proxy: http://:8080
 
-> http+tls - standard HTTPS proxy (may need to provide a trusted certificate): http+tls://:443
+> http+tls - standard HTTPS proxy (may need to provide a trusted certificate): http+tls://:443 or https://:443
 
 > http2 - HTTP2 proxy and backwards-compatible with HTTPS proxy: http2://:443
 
@@ -253,7 +253,6 @@ gost -L=kcp://:8388?c=/path/to/conf/file
 ```
 
 **NOTE:** KCP will be enabled if and only if the proxy chain is not empty and the first proxy node (the first -F parameter) is of type KCP.
-When KCP is enabled, other proxy nodes are ignored.
 
 #### Transparent proxy
 Iptables-based transparent proxy

chain.go

@@ -69,7 +69,7 @@ func (c *ProxyChain) SetNode(index int, node ProxyNode) {
 }
 
 // Init initialize the proxy chain.
-// KCP will be enabled if the first proxy node is KCP proxy (transport == kcp), the remaining nodes are ignored.
+// KCP will be enabled if the first proxy node is KCP proxy (transport == kcp).
 // HTTP2 will be enabled when at least one HTTP2 proxy node (scheme == http2) is present.
 //
 // NOTE: Should be called immediately when proxy nodes are ready.
@@ -81,6 +81,26 @@ func (c *ProxyChain) Init() {
 
 	c.lastNode = &c.nodes[length-1]
 
+	// HTTP2 restrict: HTTP2 will be enabled when at least one HTTP2 proxy node is present.
+	for i, node := range c.nodes {
+		if node.Transport == "http2" {
+			glog.V(LINFO).Infoln("HTTP2 is enabled")
+			cfg := &tls.Config{
+				InsecureSkipVerify: node.insecureSkipVerify(),
+				ServerName:         node.serverName,
+			}
+			c.http2NodeIndex = i
+			c.initHttp2Client(cfg, c.nodes[:i]...)
+			break // shortest chain for HTTP2
+		}
+	}
+
+	for i, node := range c.nodes {
+		if node.Transport == "kcp" && i > 0 {
+			glog.Fatal("KCP must be the first node in the proxy chain")
+		}
+	}
+
 	if c.nodes[0].Transport == "kcp" {
 		glog.V(LINFO).Infoln("KCP is enabled")
 		c.kcpEnabled = true
@@ -98,20 +118,6 @@ func (c *ProxyChain) Init() {
 		c.kcpConfig = config
 		return
 	}
-
-	// HTTP2 restrict: HTTP2 will be enabled when at least one HTTP2 proxy node is present.
-	for i, node := range c.nodes {
-		if node.Transport == "http2" {
-			glog.V(LINFO).Infoln("HTTP2 is enabled")
-			cfg := &tls.Config{
-				InsecureSkipVerify: node.insecureSkipVerify(),
-				ServerName:         node.serverName,
-			}
-			c.http2NodeIndex = i
-			c.initHttp2Client(cfg, c.nodes[:i]...)
-			break // shortest chain for HTTP2
-		}
-	}
 }
 
 func (c *ProxyChain) KCPEnabled() bool {
@@ -198,19 +204,6 @@ func (c *ProxyChain) GetConn() (net.Conn, error) {
 		return nil, ErrEmptyChain
 	}
 
-	if c.KCPEnabled() {
-		kcpConn, err := c.getKCPConn()
-		if err != nil {
-			return nil, err
-		}
-		pc := NewProxyConn(kcpConn, c.nodes[0])
-		if err := pc.Handshake(); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		return pc, nil
-	}
-
 	if c.Http2Enabled() {
 		nodes = nodes[c.http2NodeIndex+1:]
 		if len(nodes) == 0 {
@@ -243,23 +236,6 @@ func (c *ProxyChain) dialWithNodes(withHttp2 bool, addr string, nodes ...ProxyNo
 		return net.DialTimeout("tcp", addr, DialTimeout)
 	}
 
-	if c.KCPEnabled() {
-		kcpConn, err := c.getKCPConn()
-		if err != nil {
-			return nil, err
-		}
-		pc := NewProxyConn(kcpConn, nodes[0])
-		if err := pc.Handshake(); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		if err := pc.Connect(addr); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		return pc, nil
-	}
-
 	if withHttp2 && c.Http2Enabled() {
 		nodes = nodes[c.http2NodeIndex+1:]
 		if len(nodes) == 0 {
@@ -291,6 +267,8 @@ func (c *ProxyChain) travelNodes(withHttp2 bool, nodes ...ProxyNode) (conn *Prox
 
 	if withHttp2 && c.Http2Enabled() {
 		cc, err = c.http2Connect(node.Addr)
+	} else if node.Transport == "kcp" {
+		cc, err = c.getKCPConn()
 	} else {
 		cc, err = net.DialTimeout("tcp", node.Addr, DialTimeout)
 	}
@@ -300,19 +278,20 @@ func (c *ProxyChain) travelNodes(withHttp2 bool, nodes ...ProxyNode) (conn *Prox
 	setKeepAlive(cc, KeepAliveTime)
 
 	pc := NewProxyConn(cc, node)
+	conn = pc
 	if err = pc.Handshake(); err != nil {
 		return
 	}
-	conn = pc
+
 	for _, node := range nodes[1:] {
 		if err = conn.Connect(node.Addr); err != nil {
 			return
 		}
 		pc := NewProxyConn(conn, node)
+		conn = pc
 		if err = pc.Handshake(); err != nil {
 			return
 		}
-		conn = pc
 	}
 	return
 }

cmd/gost/vendor/github.com/ginuerzh/gost/chain.go

@@ -81,6 +81,26 @@ func (c *ProxyChain) Init() {
 
 	c.lastNode = &c.nodes[length-1]
 
+	// HTTP2 restrict: HTTP2 will be enabled when at least one HTTP2 proxy node is present.
+	for i, node := range c.nodes {
+		if node.Transport == "http2" {
+			glog.V(LINFO).Infoln("HTTP2 is enabled")
+			cfg := &tls.Config{
+				InsecureSkipVerify: node.insecureSkipVerify(),
+				ServerName:         node.serverName,
+			}
+			c.http2NodeIndex = i
+			c.initHttp2Client(cfg, c.nodes[:i]...)
+			break // shortest chain for HTTP2
+		}
+	}
+
+	for i, node := range c.nodes {
+		if node.Transport == "kcp" && i > 0 {
+			glog.Fatal("KCP must be the first node in the proxy chain")
+		}
+	}
+
 	if c.nodes[0].Transport == "kcp" {
 		glog.V(LINFO).Infoln("KCP is enabled")
 		c.kcpEnabled = true
@@ -98,20 +118,6 @@ func (c *ProxyChain) Init() {
 		c.kcpConfig = config
 		return
 	}
-
-	// HTTP2 restrict: HTTP2 will be enabled when at least one HTTP2 proxy node is present.
-	for i, node := range c.nodes {
-		if node.Transport == "http2" {
-			glog.V(LINFO).Infoln("HTTP2 is enabled")
-			cfg := &tls.Config{
-				InsecureSkipVerify: node.insecureSkipVerify(),
-				ServerName:         node.serverName,
-			}
-			c.http2NodeIndex = i
-			c.initHttp2Client(cfg, c.nodes[:i]...)
-			break // shortest chain for HTTP2
-		}
-	}
 }
 
 func (c *ProxyChain) KCPEnabled() bool {
@@ -198,19 +204,6 @@ func (c *ProxyChain) GetConn() (net.Conn, error) {
 		return nil, ErrEmptyChain
 	}
 
-	if c.KCPEnabled() {
-		kcpConn, err := c.getKCPConn()
-		if err != nil {
-			return nil, err
-		}
-		pc := NewProxyConn(kcpConn, c.nodes[0])
-		if err := pc.Handshake(); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		return pc, nil
-	}
-
 	if c.Http2Enabled() {
 		nodes = nodes[c.http2NodeIndex+1:]
 		if len(nodes) == 0 {
@@ -243,23 +236,6 @@ func (c *ProxyChain) dialWithNodes(withHttp2 bool, addr string, nodes ...ProxyNo
 		return net.DialTimeout("tcp", addr, DialTimeout)
 	}
 
-	if c.KCPEnabled() {
-		kcpConn, err := c.getKCPConn()
-		if err != nil {
-			return nil, err
-		}
-		pc := NewProxyConn(kcpConn, nodes[0])
-		if err := pc.Handshake(); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		if err := pc.Connect(addr); err != nil {
-			pc.Close()
-			return nil, err
-		}
-		return pc, nil
-	}
-
 	if withHttp2 && c.Http2Enabled() {
 		nodes = nodes[c.http2NodeIndex+1:]
 		if len(nodes) == 0 {
@@ -291,6 +267,8 @@ func (c *ProxyChain) travelNodes(withHttp2 bool, nodes ...ProxyNode) (conn *Prox
 
 	if withHttp2 && c.Http2Enabled() {
 		cc, err = c.http2Connect(node.Addr)
+	} else if node.Transport == "kcp" {
+		cc, err = c.getKCPConn()
 	} else {
 		cc, err = net.DialTimeout("tcp", node.Addr, DialTimeout)
 	}
@@ -300,19 +278,20 @@ func (c *ProxyChain) travelNodes(withHttp2 bool, nodes ...ProxyNode) (conn *Prox
 	setKeepAlive(cc, KeepAliveTime)
 
 	pc := NewProxyConn(cc, node)
+	conn = pc
 	if err = pc.Handshake(); err != nil {
 		return
 	}
-	conn = pc
+
 	for _, node := range nodes[1:] {
 		if err = conn.Connect(node.Addr); err != nil {
 			return
 		}
 		pc := NewProxyConn(conn, node)
+		conn = pc
 		if err = pc.Handshake(); err != nil {
 			return
 		}
-		conn = pc
 	}
 	return
 }

cmd/gost/vendor/vendor.json

@@ -15,10 +15,10 @@
 			"revisionTime": "2017-01-19T05:34:58Z"
 		},
 		{
-			"checksumSHA1": "g55EnuSESwa92RY7U+shNoPi900=",
+			"checksumSHA1": "oZV/w2ONwoM0nMDddIJQYDAZOPg=",
 			"path": "github.com/ginuerzh/gost",
-			"revision": "0585749a819f33404f369650e74716cddf4ed3b7",
-			"revisionTime": "2017-01-19T05:40:53Z"
+			"revision": "c1d79272573ada276e5a4234774ea4c2e2b4e9ef",
+			"revisionTime": "2017-01-19T05:42:02Z"
 		},
 		{
 			"checksumSHA1": "URsJa4y/sUUw/STmbeYx9EKqaYE=",

gost.go

@@ -11,7 +11,7 @@ import (
 )
 
 const (
-	Version = "2.3-rc2"
+	Version = "2.3-rc3"
 )
 
 // Log level for glog