tunnelAllowedPort add port segments syntax.

config.go

@@ -39,13 +39,19 @@ var defaultTunnelAllowedPort = []string{
 	"2401", "3690", "9418", // cvspserver, svn, git
 }
 
+type portSegment struct {
+	minPort int
+	maxPort int
+}
+
 type Config struct {
 	RcFile      string          // config file
 	LogFile     string          // path for log file
 	AlwaysProxy bool            // whether we should alwyas use parent proxy
 	LoadBalance LoadBalanceMode // select load balance mode
 
-	TunnelAllowedPort map[string]bool // allowed ports to create tunnel
+	TunnelAllowedPortSegment []*portSegment  // allowed port segments to create tunnel
+	TunnelAllowedPort        map[string]bool // allowed ports to create tunnel
 
 	SshServer []string
 
@@ -98,6 +104,7 @@ func initConfig(rcFile string) {
 	config.DialTimeout = defaultDialTimeout
 	config.ReadTimeout = defaultReadTimeout
 
+	config.TunnelAllowedPortSegment = []*portSegment{}
 	config.TunnelAllowedPort = make(map[string]bool)
 	for _, port := range defaultTunnelAllowedPort {
 		config.TunnelAllowedPort[port] = true
@@ -379,14 +386,55 @@ func (p configParser) ParseAddrInPAC(val string) {
 	}
 }
 
+func (c Config) IsTunnelAllowedPort(s string) bool {
+	if config.TunnelAllowedPort[s] {
+		return true
+	}
+	if port, err := strconv.Atoi(s); err == nil {
+		for _, pSeg := range config.TunnelAllowedPortSegment {
+			if port >= pSeg.minPort && port <= pSeg.maxPort {
+				return true
+			}
+		}
+	}
+	return false
+}
+
 func (p configParser) ParseTunnelAllowedPort(val string) {
 	arr := strings.Split(val, ",")
+	for i, s := range arr {
+		arr[i] = strings.TrimSpace(s)
+	}
+	for i, s := range arr {
+		var min, max int
+		if strings.Contains(s, "-") {
+			if _, err := fmt.Sscanf(s, "%d-%d", &min, &max); err != nil || min > max {
+				Fatal("tunnel allowed port segments", err)
+			}
+			if min == max {
+				arr[i] = strconv.Itoa(min)
+			} else {
+				config.TunnelAllowedPortSegment = append(config.TunnelAllowedPortSegment, &portSegment{min, max})
+				arr[i] = ""
+			}
+		}
+	}
 	for _, s := range arr {
-		s = strings.TrimSpace(s)
-		if _, err := strconv.Atoi(s); err != nil {
-			Fatal("tunnel allowed ports", err)
+		if s != "" {
+			if _, err := strconv.Atoi(s); err != nil {
+				Fatal("tunnel allowed ports", err)
+			}
+			config.TunnelAllowedPort[s] = true
+		}
+	}
+	for s := range config.TunnelAllowedPort {
+		if p1, err := strconv.Atoi(s); err == nil {
+			for _, p2 := range config.TunnelAllowedPortSegment {
+				if p1 >= p2.minPort && p1 <= p2.maxPort {
+					delete(config.TunnelAllowedPort, s)
+				}
+			}
 		}
-		config.TunnelAllowedPort[s] = true
 	}
 }
 

config_test.go

@@ -26,10 +26,11 @@ func TestParseListen(t *testing.T) {
 func TestTunnelAllowedPort(t *testing.T) {
 	initConfig("")
 	parser := configParser{}
-	parser.ParseTunnelAllowedPort("1, 2, 3, 4, 5")
+	parser.ParseTunnelAllowedPort("1, 2, 3, 4, 5, 100-500, 600-888")
 	parser.ParseTunnelAllowedPort("6")
 	parser.ParseTunnelAllowedPort("7")
 	parser.ParseTunnelAllowedPort("8")
+	parser.ParseTunnelAllowedPort("1000-3333")
 
 	testData := []struct {
 		port    string
@@ -41,12 +42,17 @@ func TestTunnelAllowedPort(t *testing.T) {
 		{"3", true},
 		{"5", true},
 		{"7", true},
+		{"342", true},
+		{"777", true},
+		{"2332", true},
+
+		{"523", false},
 		{"8080", false},
 		{"8388", false},
 	}
 
 	for _, td := range testData {
-		allowed := config.TunnelAllowedPort[td.port]
+		allowed := config.IsTunnelAllowedPort(td.port)
 		if allowed != td.allowed {
 			t.Errorf("port %s allowed %v, got %v\n", td.port, td.allowed, allowed)
 		}

doc/sample-config/rc

@@ -130,11 +130,11 @@ listen = http://127.0.0.1:7777
 # 检测超时时间使用的网站，最好使用能快速访问的站点
 #estimateTarget = example.com
 
-# 允许建立隧道连接的端口，多个端口用逗号分隔，可重复多次
+# 允许建立隧道连接的端口，多个端口用逗号分隔，可重复多次，支持端口段
 # 默认总是允许下列服务的端口: ssh, http, https, rsync, imap, pop, jabber, cvs, git, svn
 # 如需允许其他端口，请用该选项添加
 # 限制隧道连接的端口可以防止将运行 COW 的服务器上只监听本机 ip 的服务暴露给外部
-#tunnelAllowedPort = 80, 443
+#tunnelAllowedPort = 80, 443, 100-500, 2333-6666
 
 # GFW 会使 DNS 解析超时，也可能返回错误的地址，能连接但是读不到任何内容
 # 下面两个值改小一点可以加速检测网站是否被墙，但网络情况差时可能误判

doc/sample-config/rc-en

@@ -156,7 +156,7 @@ listen = http://127.0.0.1:7777
 #     ssh, http, https, rsync, imap, pop, jabber, cvs, git, svn
 #
 # Limiting ports for tunneling prevents exposing internal services to outside.
-#tunnelAllowedPort = 80, 443
+#tunnelAllowedPort = 80, 443, 100-500, 2333-6666
 
 # GFW may timeout DNS query, or return wrong server address which can connect
 # but blocks on read forever.

proxy.go

@@ -495,7 +495,7 @@ func (c *clientConn) serve() {
 			authed = true
 		}
 
-		if r.isConnect && !config.TunnelAllowedPort[r.URL.Port] {
+		if r.isConnect && !config.IsTunnelAllowedPort(r.URL.Port) {
 			sendErrorPage(c, statusForbidden, "Forbidden tunnel port",
 				genErrMsg(&r, nil, "Please contact proxy admin."))
 			return