From f584b61c93a97e1a9852f306acba673ced21e03a Mon Sep 17 00:00:00 2001
From: James R <justsomejames2@gmail.com>
Date: Wed, 18 Dec 2019 15:34:55 -0800
Subject: [PATCH] Use a random port when connecting

---
 src/d_clisrv.c |  2 +-
 src/d_net.h    |  2 ++
 src/i_tcp.c    | 14 ++++++++++----
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 7b6c35eb6..6520a1aa1 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -70,7 +70,7 @@
 boolean server = true; // true or false but !server == client
 #define client (!server)
 boolean nodownload = false;
-static boolean serverrunning = false;
+boolean serverrunning = false;
 INT32 serverplayer = 0;
 char motd[254], server_context[8]; // Message of the Day, Unique Context (even without Mumble support)
 
diff --git a/src/d_net.h b/src/d_net.h
index 8fd6c67b2..c6fe4a27f 100644
--- a/src/d_net.h
+++ b/src/d_net.h
@@ -40,6 +40,8 @@ extern SINT8 nodetoplayer2[MAXNETNODES]; // Say the numplayer for this node if a
 extern UINT8 playerpernode[MAXNETNODES]; // Used specially for splitscreen
 extern boolean nodeingame[MAXNETNODES]; // Set false as nodes leave game
 
+extern boolean serverrunning;
+
 INT32 Net_GetFreeAcks(boolean urgent);
 void Net_AckTicker(void);
 
diff --git a/src/i_tcp.c b/src/i_tcp.c
index 2dd9f0591..bd35a292a 100644
--- a/src/i_tcp.c
+++ b/src/i_tcp.c
@@ -887,6 +887,7 @@ static boolean UDP_Socket(void)
 #ifdef HAVE_IPV6
 	const INT32 b_ipv6 = M_CheckParm("-ipv6");
 #endif
+	const char *serv;
 
 
 	for (s = 0; s < mysocketses; s++)
@@ -902,11 +903,16 @@ static boolean UDP_Socket(void)
 	hints.ai_socktype = SOCK_DGRAM;
 	hints.ai_protocol = IPPROTO_UDP;
 
+	if (serverrunning)
+		serv = port_name;
+	else
+		serv = NULL;/* any port */
+
 	if (M_CheckParm("-bindaddr"))
 	{
 		while (M_IsNextParm())
 		{
-			gaie = I_getaddrinfo(M_GetNextParm(), port_name, &hints, &ai);
+			gaie = I_getaddrinfo(M_GetNextParm(), serv, &hints, &ai);
 			if (gaie == 0)
 			{
 				runp = ai;
@@ -927,7 +933,7 @@ static boolean UDP_Socket(void)
 	}
 	else
 	{
-		gaie = I_getaddrinfo("0.0.0.0", port_name, &hints, &ai);
+		gaie = I_getaddrinfo("0.0.0.0", serv, &hints, &ai);
 		if (gaie == 0)
 		{
 			runp = ai;
@@ -960,7 +966,7 @@ static boolean UDP_Socket(void)
 		{
 			while (M_IsNextParm())
 			{
-				gaie = I_getaddrinfo(M_GetNextParm(), port_name, &hints, &ai);
+				gaie = I_getaddrinfo(M_GetNextParm(), serv, &hints, &ai);
 				if (gaie == 0)
 				{
 					runp = ai;
@@ -981,7 +987,7 @@ static boolean UDP_Socket(void)
 		}
 		else
 		{
-			gaie = I_getaddrinfo("::", port_name, &hints, &ai);
+			gaie = I_getaddrinfo("::", serv, &hints, &ai);
 			if (gaie == 0)
 			{
 				runp = ai;