i_tcp: reset errno in UDP_Bind and SOCK_Send

on non WINSOCK systems
UDP_Bind: check for network send buffer and attempt to raise its size if its too small
2025-10-29 20:10:12 +01:00 · 2025-10-29 20:06:24 +01:00 · 2025-10-29 19:06:45 +01:00 · 2025-10-29 19:06:42 +01:00 · 2025-10-29 19:06:39 +01:00 · 2025-10-29 19:06:36 +01:00
2 changed files with 118 additions and 52 deletions
@@ -1127,9 +1127,7 @@ boolean HGetPacket(void)

 	while (true)
 	{
-		I_NetGet();
-
-		if (doomcom->remotenode == -1) // No packet received
+		if (!I_NetGet()) // No packets received
 			return false;

 		getbytes += packetheaderlength + doomcom->datalength; // For stat
@@ -1165,6 +1163,7 @@ boolean HGetPacket(void)
 			GotAcks();
 			continue;
 		}
+
 		doomcom->datalength -= BASEPACKETSIZE;
 		break;
 	}
@@ -28,14 +28,14 @@
 #endif

 #ifdef _WIN32
-#define USE_WINSOCK
+	#define USE_WINSOCK
 #endif //WIN32 OS

 #ifdef USE_WINSOCK
-#include <ws2tcpip.h>
-#define addrinfo_t ADDRINFOA
+	#include <ws2tcpip.h>
+	#define addrinfo_t ADDRINFOA
 #else
-#define addrinfo_t struct addrinfo
+	#define addrinfo_t struct addrinfo
 #endif

 #include "doomdef.h"
@@ -148,16 +148,16 @@ static UINT8 UPNP_support = TRUE;

 #define DEFAULTPORT "5029"

-#if defined (USE_WINSOCK)
-typedef SOCKET SOCKET_TYPE;
-#define ERRSOCKET (SOCKET_ERROR)
+#ifdef USE_WINSOCK
+	typedef SOCKET SOCKET_TYPE;
+	#define ERRSOCKET (SOCKET_ERROR)
 #else
-#if defined (__unix__) || defined (__APPLE__) || defined (__HAIKU__)
-typedef int SOCKET_TYPE;
-#else
-typedef unsigned long SOCKET_TYPE;
-#endif
-#define ERRSOCKET (-1)
+	#if defined (__unix__) || defined (__APPLE__) || defined (__HAIKU__)
+		typedef int SOCKET_TYPE;
+	#else
+		typedef unsigned long SOCKET_TYPE;
+	#endif
+	#define ERRSOCKET (-1)
 #endif

 #define IPV6_MULTICAST_ADDRESS "ff15::57e1:1a12"
@@ -345,17 +345,15 @@ static const char *SOCK_AddrToStr(mysockaddr_t *sk)
 {
 	static char s[64]; // 255.255.255.255:65535 or
 	// [ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535
-
 #ifdef HAVE_IPV6
 	int v6 = (sk->any.sa_family == AF_INET6);
 #else
 	int v6 = 0;
 #endif
-
 	void *addr;
 	int e = 0; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once

-	if(sk->any.sa_family == AF_INET)
+	if (sk->any.sa_family == AF_INET)
 		addr = &sk->ip4.sin_addr;
 #ifdef HAVE_IPV6
 	else if(sk->any.sa_family == AF_INET6)
@@ -364,9 +362,11 @@ static const char *SOCK_AddrToStr(mysockaddr_t *sk)
 	else
 		addr = NULL;

-	if(addr == NULL)
+	if (addr == NULL)
+	{
 		sprintf(s, "No address");
-	else if(inet_ntop(sk->any.sa_family, addr, &s[v6], sizeof (s) - v6) == NULL)
+	}
+	else if (inet_ntop(sk->any.sa_family, addr, &s[v6], sizeof (s) - v6) == NULL)
 	{
 		e = errno;
 		sprintf(s, "Unknown family type, error #%u: %s", e, strerror(e));
@@ -381,7 +381,7 @@ static const char *SOCK_AddrToStr(mysockaddr_t *sk)
 			strcat(s, va(":%d", ntohs(sk->ip6.sin6_port)));
 	}
 #endif
-	else if(sk->any.sa_family == AF_INET  && sk->ip4.sin_port  != 0)
+	else if (sk->any.sa_family == AF_INET  && sk->ip4.sin_port != 0)
 		strcat(s, va(":%d", ntohs(sk->ip4.sin_port)));

 	return s;
@@ -481,7 +481,6 @@ static boolean SOCK_cmpaddr(mysockaddr_t *a, mysockaddr_t *b, UINT8 mask)
 		return false;
 }

-
 // This is a hack. For some reason, nodes aren't being freed properly.
 // This goes through and cleans up what nodes were supposed to be freed.
 /** \warning This function causes the file downloading to stop if someone joins.
@@ -636,7 +635,7 @@ static boolean SOCK_Get(void)
 		c = recvfrom(mysockets[n], (char *)&doomcom->data, MAXPACKETLENGTH, 0,
 			(void *)&fromaddress, &fromlen);

-		if (c > 0)
+		if (c != ERRSOCKET)
 		{
 #ifdef USE_STUN
 			if (STUN_got_response(doomcom->data, c))
@@ -652,20 +651,21 @@ static boolean SOCK_Get(void)
 #endif

 			// find remote node number
-			for (j = 1; j <= MAXNETNODES; j++) //include LAN
+			for (j = 1; j <= MAXNETNODES; j++) // include LAN
 			{
 				if (SOCK_cmpaddr(&fromaddress, &clientaddress[j], 0))
 				{
 					doomcom->remotenode = (INT16)j; // good packet from a game player
 					doomcom->datalength = (INT16)c;
 					nodesocket[j] = mysockets[n];
-					return false;
+					return true;
 				}
 			}
 			// not found

 			// find a free slot
 			j = getfreenode();
+
 			if (j > 0)
 			{
 				const time_t curTime = time(NULL);
@@ -746,13 +746,19 @@ static inline ssize_t SOCK_SendToAddr(SOCKET_TYPE socket, mysockaddr_t *sockaddr

 #define ALLOWEDERROR(x) ((x) == ECONNREFUSED || (x) == EWOULDBLOCK || (x) == EHOSTUNREACH || (x) == ENETUNREACH || (x) == EADDRNOTAVAIL)

+// FIXME: maybe retry if this failed somehow?
+// windows kinda dies rather often when some other network heavy thing runs besides kart
 static void SOCK_Send(void)
 {
 	ssize_t c = ERRSOCKET;
 	int e = 0; // save error code so it can't be modified later code and avoid calling WSAGetLastError() more then once
 	size_t i, j;

-	if (!nodeconnected[doomcom->remotenode])
+#ifndef USE_WINSOCK
+	errno = 0;
+#endif
+
+	if (doomcom->remotenode < 0 || !nodeconnected[doomcom->remotenode])
 		return;

 	if (doomcom->remotenode == BROADCASTADDR)
@@ -840,6 +846,10 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 	mysockaddr_t straddr;
 	socklen_t len = sizeof(straddr);

+#ifndef USE_WINSOCK
+	errno = 0;
+#endif
+
 	if (s == (SOCKET_TYPE)ERRSOCKET)
 		return (SOCKET_TYPE)ERRSOCKET;

@@ -970,30 +980,90 @@ static SOCKET_TYPE UDP_Bind(int family, struct sockaddr *addr, socklen_t addrlen
 		e = errno;
 		I_OutputMsg("getting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
 	}
-	CONS_Printf(M_GetText("Network system buffer: %dKb\n"), opt>>10);
+	CONS_Printf(M_GetText("Network receive buffer: %dKb\n"), opt>>10);

-	if (opt < 64<<10) // 64k
+	//if (opt < 64<<10) // 64k minimum
+	if (opt < 256<<10) // no try 256k first
 	{
-		opt = 64<<10;
-		opts = (socklen_t)sizeof(opt);
-		rc = setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, opts);
-		if (rc <= -1)
+		const int buf_sizes[] = {256<<10, 128<<10, 64<<10}; // Try 256k, 128k, then 64k
+		size_t i;
+
+		for (i = 0; i < sizeof(buf_sizes) / sizeof(buf_sizes[0]); i++)
 		{
-			e = errno;
-			I_OutputMsg("setting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
-		}
-		opt = 0;
-		rc = getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
-		if (rc <= -1)
-		{
-			e = errno;
-			I_OutputMsg("getting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
+			opt = buf_sizes[i];
+			opts = (socklen_t)sizeof(opt);
+			rc = setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("setting SO_RCVBUF to %dKb failed: #%u, %s\n", opt>>10, e, strerror(e));
+				continue;
+			}
+
+			opt = 0;
+			rc = getsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, &opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("getting SO_RCVBUF failed: #%u, %s\n", e, strerror(e));
+			}
+
+			if (opt >= buf_sizes[i])
+			{
+				CONS_Printf(M_GetText("Network system receive buffer set to: %dKb\n"), opt>>10);
+				break;
+			}
 		}

 		if (opt < 64<<10)
-			CONS_Alert(CONS_WARNING, M_GetText("Can't set buffer length to 64k, file transfer will be bad\n"));
-		else
-			CONS_Printf(M_GetText("Network system buffer set to: %dKb\n"), opt>>10);
+			CONS_Alert(CONS_WARNING, M_GetText("Can't set receive buffer length to at least 64k, file transfer will be bad\n"));
+	}
+
+	opt = 0;
+	opts = (socklen_t)sizeof(opt);
+	rc = getsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&opt, &opts);
+	if (rc <= -1)
+	{
+		e = errno;
+		I_OutputMsg("getting SO_SNDBUF failed: #%u, %s\n", e, strerror(e));
+	}
+	CONS_Printf(M_GetText("Network send buffer: %dKb\n"), opt>>10);
+
+	//if (opt < 64<<10) // 64k minimum
+	if (opt < 256<<10) // no try 256k first
+	{
+		int buf_sizes[] = {256<<10, 128<<10, 64<<10}; // Try 256k, 128k, then 64k
+		size_t i;
+
+		for (i = 0; i < sizeof(buf_sizes) / sizeof(buf_sizes[0]); i++)
+		{
+			opt = buf_sizes[i];
+			opts = (socklen_t)sizeof(opt);
+			rc = setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&opt, opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("setting SO_SNDBUF to %dKb failed: #%u, %s\n", opt>>10, e, strerror(e));
+				continue;
+			}
+
+			opt = 0;
+			rc = getsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&opt, &opts);
+			if (rc <= -1)
+			{
+				e = errno;
+				I_OutputMsg("getting SO_SNDBUF failed: #%u, %s\n", e, strerror(e));
+			}
+
+			if (opt >= buf_sizes[i])
+			{
+				CONS_Printf(M_GetText("Network system send buffer set to: %dKb\n"), opt>>10);
+				break;
+			}
+		}
+
+		if (opt < 64<<10)
+			CONS_Alert(CONS_WARNING, M_GetText("Can't set send buffer length to at least 64k, file transfer will be bad\n"));
 	}

 	rc = getsockname(s, &straddr.any, &len);
@@ -1269,9 +1339,9 @@ void I_ShutdownTcpDriver(void)
 	init_tcp_driver = false;
 }

-static boolean SOCK_GetAddr(struct sockaddr_in *sin, const char *address, const char *port, boolean test)
+static boolean SOCK_GetAddr(mysockaddr_t *sin, const char *address, const char *port, boolean test)
 {
-	addrinfo_t *ai = NULL, *runp, hints;
+	addrinfo_t *ai, *runp, hints;
 	int gaie;
 	size_t i;

@@ -1287,10 +1357,7 @@ static boolean SOCK_GetAddr(struct sockaddr_in *sin, const char *address, const
 	gaie = getaddrinfo(address, port, &hints, &ai);

 	if (gaie != 0)
-	{
-		freeaddrinfo(ai);
 		return false;
-	}

 	runp = ai;

@@ -1330,7 +1397,7 @@ static SINT8 SOCK_NetMakeNodewPort(const char *address, const char *port)

 	if (newnode != -1)
 	{
-		if (!SOCK_GetAddr(&clientaddress[newnode].ip4, address, port, true))
+		if (!SOCK_GetAddr(&clientaddress[newnode], address, port, true))
 		{
 			nodeconnected[newnode] = false;
 			return -1;
@@ -1358,7 +1425,7 @@ static void rendezvous(int size)

 	if (tic != refreshtic)
 	{
-		if (SOCK_GetAddr(&rzv.ip4, host, (port ? port : "7777"), false))
+		if (SOCK_GetAddr(&rzv, host, (port ? port : "7777"), false))
 		{
 			refreshtic = tic;
 		}
Author	SHA1	Message	Date
Alug	5973004bb9	i_tcp: reset errno in UDP_Bind and SOCK_Send on non WINSOCK systems	2025-10-29 20:10:12 +01:00
Alug	599ef7fad7	UDP_Bind: check for network send buffer and attempt to raise its size if its too small exactly the same as the receive buffer	2025-10-29 20:06:24 +01:00
Alug	3220faac1e	UDP_Bind: attempt to set receive buffer to 256kb if smaller if that fails, try 128k, if that also somehow fails try 64k again	2025-10-29 19:06:45 +01:00
Gustaf Alhäll	ea3e23e055	Fix buffer underflow when querying invalid nodes	2025-10-29 19:06:42 +01:00
Alug	112d389dcd	SOCK_GetAddr: freeaddrinfo does not need to be called on getaddrinfo failure	2025-10-29 19:06:39 +01:00
Alug	0611d49455	some i_tcp fixes - SOCK_Get return true when receiving good packet from a lan player - SOCK_GetAddr fix handling of ipv6 addresses, so ipv6 servers can be found in the serverlist taken from srb2/classic	2025-10-29 19:06:36 +01:00