/*
 * maplestory.c
 *
 * Copyright (C) 2009-11 - ipoque GmbH
 * Copyright (C) 2011-22 - ntop.org
 *
 * This file is part of nDPI, an open source deep packet inspection
 * library based on the OpenDPI and PACE technology by ipoque GmbH
 *
 * nDPI is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nDPI is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

#include "ndpi_protocol_ids.h"

#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_MAPLESTORY

#include "ndpi_api.h"
#include "ndpi_private.h"

static void ndpi_int_maplestory_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MAPLESTORY, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}


static void ndpi_search_maplestory(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
  struct ndpi_packet_struct *packet = &ndpi_struct->packet;
	
  NDPI_LOG_DBG(ndpi_struct, "search maplestory\n");

  if (packet->payload_packet_len == 16
      && (ntohl(get_u_int32_t(packet->payload, 0)) == 0x0e003a00 || ntohl(get_u_int32_t(packet->payload, 0)) == 0x0e003b00
	  || ntohl(get_u_int32_t(packet->payload, 0)) == 0x0e004200)
      && ntohs(get_u_int16_t(packet->payload, 4)) == 0x0100 && (packet->payload[6] == 0x32 || packet->payload[6] == 0x33)) {
    NDPI_LOG_INFO(ndpi_struct, "found maplestory\n");
    ndpi_int_maplestory_add_connection(ndpi_struct, flow);
    return;
  }

  if (packet->payload_packet_len > NDPI_STATICSTRING_LEN("GET /maple")
      && memcmp(packet->payload, "GET /maple", NDPI_STATICSTRING_LEN("GET /maple")) == 0) {
    ndpi_parse_packet_line_info(ndpi_struct, flow);
    /* Maplestory update */
    if (packet->payload_packet_len > NDPI_STATICSTRING_LEN("GET /maple/patch")
	&& packet->payload[NDPI_STATICSTRING_LEN("GET /maple")] == '/') {
      if (packet->user_agent_line.ptr != NULL && packet->host_line.ptr != NULL
	  && packet->user_agent_line.len == NDPI_STATICSTRING_LEN("Patcher")
	  && packet->host_line.len > NDPI_STATICSTRING_LEN("patch.")
	  && memcmp(&packet->payload[NDPI_STATICSTRING_LEN("GET /maple/")], "patch",
		    NDPI_STATICSTRING_LEN("patch")) == 0
	  && memcmp(packet->user_agent_line.ptr, "Patcher", NDPI_STATICSTRING_LEN("Patcher")) == 0
	  && memcmp(packet->host_line.ptr, "patch.", NDPI_STATICSTRING_LEN("patch.")) == 0) {
	NDPI_LOG_INFO(ndpi_struct, "found maplestory update\n");
	ndpi_int_maplestory_add_connection(ndpi_struct, flow);
	return;
      }
    } else if (packet->user_agent_line.ptr != NULL && packet->user_agent_line.len == NDPI_STATICSTRING_LEN("AspINet")
	       && memcmp(&packet->payload[NDPI_STATICSTRING_LEN("GET /maple")], "story/",
			 NDPI_STATICSTRING_LEN("story/")) == 0
	       && memcmp(packet->user_agent_line.ptr, "AspINet", NDPI_STATICSTRING_LEN("AspINet")) == 0) {
      NDPI_LOG_INFO(ndpi_struct, "found maplestory update\n");
      ndpi_int_maplestory_add_connection(ndpi_struct, flow);
      return;
    }
  }

  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);

}


void init_maplestory_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
  ndpi_set_bitmask_protocol_detection("MapleStory", ndpi_struct, *id,
				      NDPI_PROTOCOL_MAPLESTORY,
				      ndpi_search_maplestory,
				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
				      ADD_TO_DETECTION_BITMASK);

  *id += 1;
}