support tcp keepalive params (#2863)

pkg/config/client.go

@@ -40,6 +40,9 @@ type ClientCommonConf struct {
 	ServerPort int `ini:"server_port" json:"server_port"`
 	// The maximum amount of time a dial to server will wait for a connect to complete.
 	DialServerTimeout int64 `ini:"dial_server_timeout" json:"dial_server_timeout"`
+	// DialServerKeepAlive specifies the interval between keep-alive probes for an active network connection between frpc and frps.
+	// If negative, keep-alive probes are disabled.
+	DialServerKeepAlive int64 `ini:"dial_server_keepalive" json:"dial_server_keepalive"`
 	// ConnectServerLocalIP specifies the address of the client bind when it connect to server.
 	// By default, this value is empty.
 	// this value only use in TCP/Websocket protocol. Not support in KCP protocol.
@@ -163,6 +166,7 @@ func GetDefaultClientConf() ClientCommonConf {
 		ServerAddr:              "0.0.0.0",
 		ServerPort:              7000,
 		DialServerTimeout:       10,
+		DialServerKeepAlive:     7200,
 		HTTPProxy:               os.Getenv("http_proxy"),
 		LogFile:                 "console",
 		LogWay:                  "console",

pkg/config/client_test.go

@@ -262,6 +262,7 @@ func Test_LoadClientCommonConf(t *testing.T) {
 		ServerAddr:              "0.0.0.9",
 		ServerPort:              7009,
 		DialServerTimeout:       10,
+		DialServerKeepAlive:     7200,
 		HTTPProxy:               "http://user:passwd@192.168.1.128:8080",
 		LogFile:                 "./frpc.log9",
 		LogWay:                  "file",

pkg/config/server.go

@@ -121,6 +121,9 @@ type ServerCommonConf struct {
 	// TCPMuxKeepaliveInterval specifies the keep alive interval for TCP stream multipler.
 	// If TCPMux is true, heartbeat of application layer is unnecessary because it can only rely on heartbeat in TCPMux.
 	TCPMuxKeepaliveInterval int64 `ini:"tcp_mux_keepalive_interval" json:"tcp_mux_keepalive_interval"`
+	// TCPKeepAlive specifies the interval between keep-alive probes for an active network connection between frpc and frps.
+	// If negative, keep-alive probes are disabled.
+	TCPKeepAlive int64 `ini:"tcp_keepalive" json:"tcp_keepalive"`
 	// Custom404Page specifies a path to a custom 404 page to display. If this
 	// value is "", a default page will be displayed. By default, this value is
 	// "".
@@ -201,6 +204,7 @@ func GetDefaultServerConf() ServerCommonConf {
 		SubDomainHost:           "",
 		TCPMux:                  true,
 		TCPMuxKeepaliveInterval: 60,
+		TCPKeepAlive:            7200,
 		AllowPorts:              make(map[int]struct{}),
 		MaxPoolCount:            5,
 		MaxPortsPerClient:       0,

pkg/config/server_test.go

@@ -140,6 +140,7 @@ func Test_LoadServerCommonConf(t *testing.T) {
 				SubDomainHost:           "frps.com",
 				TCPMux:                  true,
 				TCPMuxKeepaliveInterval: 60,
+				TCPKeepAlive:            7200,
 				UDPPacketSize:           1509,
 
 				HTTPPlugins: map[string]plugin.HTTPPluginOptions{
@@ -191,6 +192,7 @@ func Test_LoadServerCommonConf(t *testing.T) {
 				DetailedErrorsToClient:  true,
 				TCPMux:                  true,
 				TCPMuxKeepaliveInterval: 60,
+				TCPKeepAlive:            7200,
 				AllowPorts:              make(map[int]struct{}),
 				MaxPoolCount:            5,
 				HeartbeatTimeout:        90,