First

sourcemod/gamedata/udp-cap.txt

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+"Games"
+{
+	/* Team Fortress 2 */
+	"tf"
+	{
+		"Signatures"
+		{
+			"CBaseServer::ProcessConnectionlessPacket"
+			{
+				"library"	"engine"
+				"windows"	"\x55\x8B\xEC\x81\xEC\x50\x0A"
+				"linux"		"_ZN11CBaseServer27ProcessConnectionlessPacketEP11netpacket_s"
+			}
+		}
+	}
+}

sourcemod/scripting/include/udpcap.inc

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+#if defined _udpcap_included
+ #endinput
+#endif
+#define _udpcap_included
+
+enum netadrtype_t
+{
+	NA_NULL = 0,
+	NA_LOOPBACK,
+	NA_BROADCAST,
+	NA_IP,
+};
+
+forward Action UDPC_ProcessIncomingPacket(const char[] ip, int port, const char[] data, int length, netadrtype_t netaddrtype);
+
+
+
+public Extension __ext_udpcap = 
+{
+	name = "UDPCap",
+	file = "UDPCap.ext",
+#if defined AUTOLOAD_EXTENSIONS
+	autoload = 1,
+#else
+	autoload = 0,
+#endif
+#if defined REQUIRE_EXTENSIONS
+	required = 1,
+#else
+	required = 0,
+#endif
+};