feat: support set local ip in client when connect server (#2774)

* feat: support set local ip in client when connect server

* fix: typo

Co-authored-by: blizard863 <760076784@qq.com>

client/control.go

@@ -246,6 +246,9 @@ func (ctl *Control) connectServer() (conn net.Conn, err error) {
 			protocol = "tcp"
 			dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{Hook: frpNet.DialHookWebsocket()}))
 		}
+		if ctl.clientCfg.ConnectServerLocalIP != "" {
+			dialOptions = append(dialOptions, libdial.WithLocalAddr(ctl.clientCfg.ConnectServerLocalIP))
+		}
 		dialOptions = append(dialOptions,
 			libdial.WithProtocol(protocol),
 			libdial.WithProxy(proxyType, addr),

client/service.go

@@ -240,6 +240,9 @@ func (svr *Service) login() (conn net.Conn, session *fmux.Session, err error) {
 		protocol = "tcp"
 		dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{Hook: frpNet.DialHookWebsocket()}))
 	}
+	if svr.cfg.ConnectServerLocalIP != "" {
+		dialOptions = append(dialOptions, libdial.WithLocalAddr(svr.cfg.ConnectServerLocalIP))
+	}
 	dialOptions = append(dialOptions,
 		libdial.WithProtocol(protocol),
 		libdial.WithProxy(proxyType, addr),

conf/frpc_full.ini

@@ -76,6 +76,10 @@ login_fail_exit = true
 # now it supports tcp, kcp and websocket, default is tcp
 protocol = tcp
 
+# set client binding ip when connect server, default is empty.
+# only when protocol = tcp or websocket, the value will be used.
+connect_server_local_ip = 0.0.0.0
+
 # if tls_enable is true, frpc will connect frps by tls
 tls_enable = true
 

pkg/config/client.go

@@ -38,6 +38,10 @@ type ClientCommonConf struct {
 	// ServerPort specifies the port to connect to the server on. By default,
 	// this value is 7000.
 	ServerPort int `ini:"server_port" json:"server_port"`
+	// 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.
+	ConnectServerLocalIP string `ini:"connect_server_local_ip" json:"connect_server_local_ip"`
 	// HTTPProxy specifies a proxy address to connect to the server through. If
 	// this value is "", the server will be connected to directly. By default,
 	// this value is read from the "http_proxy" environment variable.