/*

 * apple_push.c

 *

 * Copyright (C) 2018 by 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_APPLE_PUSH

#include "ndpi_api.h"

#include "ndpi_private.h"

static int is_apple_push_addr(const struct ndpi_packet_struct *packet)

{

  if(packet->iph) {

    /* 17.0.0.0/8 */

    if(((ntohl(packet->iph->saddr) & 0xFF000000 /* 255.0.0.0 */) == 0x11000000) ||

       ((ntohl(packet->iph->daddr) & 0xFF000000 /* 255.0.0.0 */) == 0x11000000))

      return 1;

  } else if(packet->iphv6) {

    /* 2620:149:a44::/48 */

    if(((packet->iphv6->ip6_src.u6_addr.u6_addr32[0] == ntohl(0x26200149)) &&

        ((packet->iphv6->ip6_src.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a440000))) ||

       ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[0] == ntohl(0x26200149)) &&

        ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a440000))))

      return 1;

    /* 2403:300:a42::/48 */

    if(((packet->iphv6->ip6_src.u6_addr.u6_addr32[0] == ntohl(0x24030300)) &&

        ((packet->iphv6->ip6_src.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a420000))) ||

       ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[0] == ntohl(0x24030300)) &&

        ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a420000))))

      return 1;

    /* 2403:300:a51::/48 */

    if(((packet->iphv6->ip6_src.u6_addr.u6_addr32[0] == ntohl(0x24030300)) &&

        ((packet->iphv6->ip6_src.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a510000))) ||

       ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[0] == ntohl(0x24030300)) &&

        ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a510000))))

      return 1;

    /* 2a01:b740:a42::/48 */

    if(((packet->iphv6->ip6_src.u6_addr.u6_addr32[0] == ntohl(0x2a0ab740)) &&

        ((packet->iphv6->ip6_src.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a420000))) ||

       ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[0] == ntohl(0x2a0ab740)) &&

        ((packet->iphv6->ip6_dst.u6_addr.u6_addr32[1] & htonl (0xffff0000)) == ntohl(0x0a420000))))

      return 1;

  }

  return 0;

}

static void ndpi_check_apple_push(struct ndpi_detection_module_struct *ndpi_struct,

          struct ndpi_flow_struct *flow) {

  struct ndpi_packet_struct *packet = &ndpi_struct->packet;

  /* https://support.apple.com/en-us/HT203609 */

  if(is_apple_push_addr(packet)) {

    u_int16_t apple_push_port       = ntohs(5223);

    u_int16_t notification_apn_port = ntohs(2197);

    if((packet->tcp->source == apple_push_port) || (packet->tcp->dest == apple_push_port) ||

       (packet->tcp->source == notification_apn_port) || (packet->tcp->dest == notification_apn_port)) {

      NDPI_LOG_INFO(ndpi_struct, "found apple_push\n");

      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_APPLE_PUSH, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);

      return;

    }

  }

  NDPI_EXCLUDE_DISSECTOR(ndpi_struct, flow);

}

static void ndpi_search_apple_push(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)

{

  NDPI_LOG_DBG(ndpi_struct, "search apple_push\n");

  ndpi_check_apple_push(ndpi_struct, flow);

}

void init_apple_push_dissector(struct ndpi_detection_module_struct *ndpi_struct)

{

  register_dissector("APPLE_PUSH", ndpi_struct,

                     ndpi_search_apple_push,

                     NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,

                     1, NDPI_PROTOCOL_APPLE_PUSH);

}