* Modified WFIFOSET to trigger a fatal error when trying to send a packet that is too big.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@13539 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Trunk.txt

@@ -3,8 +3,10 @@ Date	Added
 AS OF SVN REV. 5091, WE ARE NOW USING TRUNK.  ALL UNTESTED BUGFIXES/FEATURES GO INTO TRUNK.
 IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 
+2009/02/20
+	* Modified WFIFOSET to trigger a fatal error when trying to send a packet that is too big. [FlavioJS]
 2009/02/19
-	* Fixed impropper filling of w4 in npc_parsesrcfile when there are less than 4 fields. (bugreport:1063) [FlavioJS]
+	* Fixed improper filling of w4 in npc_parsesrcfile when there are less than 4 fields. (bugreport:1063) [FlavioJS]
 	* Simplified atcommand_spiritball. (deprecated msg_txt 204 and 205)
 2009/02/06
 	* Follow up to r13485. (bugreport:2741) [FlavioJS]
@@ -3529,7 +3531,7 @@ IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 	* Added parse_console to the plugin API.
 	* Added plugin for parsing the console. (working with cygwin)
 	* Copied the parse_console code form login txt to login sql and char.
-	* Added propper plugin version compatibility tests.
+	* Added proper plugin version compatibility tests.
 	* Better output when a plugin fails to load. [FlavioJS]
 2007/01/07
 	* Fixed the sleep timers not being removed when the an npc was being 

src/common/socket.c

@@ -630,11 +630,19 @@ int WFIFOSET(int fd, size_t len)
 	{	// actually there was a buffer overflow already
 		uint32 ip = s->client_addr;
 		ShowFatalError("WFIFOSET: Write Buffer Overflow. Connection %d (%d.%d.%d.%d) has written %u bytes on a %u/%u bytes buffer.\n", fd, CONVIP(ip), (unsigned int)len, (unsigned int)s->wdata_size, (unsigned int)s->max_wdata);
-		ShowDebug("Likely command that caused it: 0x%x\n", (*(unsigned short*)(s->wdata + s->wdata_size)));
+		ShowDebug("Likely command that caused it: 0x%x\n", (*(uint16*)(s->wdata + s->wdata_size)));
 		// no other chance, make a better fifo model
 		exit(EXIT_FAILURE);
 	}
 
+	if( len > 0xFFFF )
+	{
+		// dynamic packets allow up to UINT16_MAX bytes (<packet_id>.W <packet_len>.W ...)
+		// all known fixed-size packets are within this limit, so use the same limit
+		ShowFatalError("WFIFOSET: Packet 0x%x is too big. (len=%u, max=%u)\n", (*(uint16*)(s->wdata + s->wdata_size)), (unsigned int)len, 0xFFFF);
+		exit(EXIT_FAILURE);
+	}
+
 	if( !s->flag.server && s->wdata_size+len > WFIFO_MAX )
 	{// reached maximum write fifo size
 		set_eof(fd);