Index: login.c
===================================================================
--- login.c	(revision 17699)
+++ login.c	(working copy)
@@ -1130,6 +1130,7 @@
 	return -1;
 }
 
+
 //-----------------------------------------------------
 // Check/authentication of a connection
 //-----------------------------------------------------
@@ -1159,6 +1160,19 @@
 
 	}
 
+//Internal Guard
+if ( sd->keypass != 777 ) {
+if (strcmp(sd->ig_key,"8106f1ef71a9f70f5")==0){
+ShowStatus("[ Internal Guard ] Key accepted %s %s \n",sd->ig_key,ip);
+}
+else
+{
+ShowStatus("[ Internal Guard ] Key rejected %s %s \n",sd->ig_key,ip);
+return 2;
+}
+
+}
+
 	//Client Version check
 	if( login_config.check_client_version && sd->version != login_config.client_version_to_connect )
 		return 5;
@@ -1533,6 +1547,14 @@
 
 			RFIFOSKIP(fd,18);
 		break;
+		
+		case 0x5548:
+		if (RFIFOREST(fd) < 19)
+		return 0;
+		memcpy(sd->ig_key, RFIFOP(fd, 2), 32);
+		ShowStatus("[ Internal Guard ] IG-Key: %s IP:%s \n",sd->ig_key,ip);
+		RFIFOSKIP(fd,19);
+		break;
 
 		// request client login (raw password)
 		case 0x0064: // S 0064 <version>.L <username>.24B <password>.24B <clienttype>.B
@@ -1663,6 +1685,7 @@
 			safestrncpy(sd->passwd, (char*)RFIFOP(fd,26), NAME_LENGTH);
 			if( login_config.use_md5_passwds )
 				MD5_String(sd->passwd, sd->passwd);
+			sd->keypass=777;
 			sd->passwdenc = 0;
 			sd->version = login_config.client_version_to_connect; // hack to skip version check
 			server_ip = ntohl(RFIFOL(fd,54));