- Harden the client and server protocol against UDP spoofing attacks. This will defend ioquake3 against http://aluigi.altervista.org/papers/q3noclient.txt (#3041)

- Retains full compatibility to the old but unsecure protocol between clients and servers
- Harden the connection process against DoS attacks, possibly connected to UDP spoofing

code/qcommon/q_shared.c

@@ -962,7 +962,7 @@ int Q_CountChar(const char *string, char tocount)
 	return count;
 }
 
-void QDECL Com_sprintf(char *dest, int size, const char *fmt, ...)
+int QDECL Com_sprintf(char *dest, int size, const char *fmt, ...)
 {
 	int		len;
 	va_list		argptr;
@@ -973,6 +973,8 @@ void QDECL Com_sprintf(char *dest, int size, const char *fmt, ...)
 
 	if(len >= size)
 		Com_Printf("Com_sprintf: Output length %d too short, require %d bytes.\n", size, len);
+	
+	return len;
 }
 
 /*