L2packets: add getsockname() to net layer

sniff gameclient: add option to bind outcoming socket to some port (TeonPvP hacks)

l2packets/net_io/L2Packet_NetLayer.h

@@ -30,6 +30,7 @@ int L2PNet_Cleanup();
 #define L2PFUNC_SELECT        8
 #define L2PFUNC_SOCKET        9
 #define L2PFUNC_LISTEN        10
+#define L2PFUNC_GETSOCKNAME   11
 /** Overrides specified function for L2Packets network layer.\n
  * New function must have the same prototype as corresponding
  * L2PNet_* function!
@@ -192,4 +193,12 @@ int L2PNet_FD_ISSET( unsigned int sock, fd_set *set );
 */
 bool L2PNet_resolveHostname( const char *hostname, struct in_addr *pinAddr );
 
+
+/** Gets local socket address.\n
+* \param sock socket
+* \param saddr output struct that receives address
+* \return 0 on success
+*/
+int L2PNet_getsockname( unsigned int sock, struct sockaddr_in *saddr );
+
 #endif /* H_L2P_NET_LAYER */