res_hep_rtcp.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2014, Digium, Inc.
 *
 * Matt Jordan <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*!
 * \file
 * \brief RTCP logging with Homer
 *
 * \author Matt Jordan <[email protected]>
 *
 */

/*** MODULEINFO
   <depend>res_hep</depend>
   <support_level>extended</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/res_hep.h"
#include "asterisk/module.h"
#include "asterisk/netsock2.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/stasis.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/json.h"
#include "asterisk/config.h"

static struct stasis_subscription *stasis_rtp_subscription;

static char *assign_uuid(struct ast_json *json_channel)
{
   const char *channel_name = ast_json_string_get(ast_json_object_get(json_channel, "name"));
   enum hep_uuid_type uuid_type = hepv3_get_uuid_type();
   char *uuid = NULL;

   if (!channel_name) {
      return NULL;
   }

   if (uuid_type == HEP_UUID_TYPE_CALL_ID) {
      struct ast_channel *chan = NULL;
      char buf[128];

      if (ast_begins_with(channel_name, "PJSIP")) {
         chan = ast_channel_get_by_name(channel_name);

         if (chan && !ast_func_read(chan, "CHANNEL(pjsip,call-id)", buf, sizeof(buf))) {
            uuid = ast_strdup(buf);
         }
      } else if (ast_begins_with(channel_name, "SIP")) {
         chan = ast_channel_get_by_name(channel_name);

         if (chan && !ast_func_read(chan, "SIP_HEADER(call-id)", buf, sizeof(buf))) {
            uuid = ast_strdup(buf);
         }
      }

      ast_channel_cleanup(chan);
   }

   /* If we couldn't get the call-id or didn't want it, just use the channel name */
   if (!uuid) {
      uuid = ast_strdup(channel_name);
   }

   return uuid;
}

static void rtcp_message_handler(struct stasis_message *message)
{

   RAII_VAR(struct ast_json *, json_payload, NULL, ast_json_unref);
   RAII_VAR(char *,  payload, NULL, ast_json_free);
   struct ast_json *json_blob;
   struct ast_json *json_channel;
   struct ast_json *json_rtcp;
   struct hepv3_capture_info *capture_info;
   struct ast_json *from;
   struct ast_json *to;
   struct timeval current_time = ast_tvnow();

   json_payload = stasis_message_to_json(message, NULL);
   if (!json_payload) {
      return;
   }

   json_blob = ast_json_object_get(json_payload, "blob");
   if (!json_blob) {
      return;
   }

   json_channel = ast_json_object_get(json_payload, "channel");
   if (!json_channel) {
      return;
   }

   json_rtcp = ast_json_object_get(json_payload, "rtcp_report");
   if (!json_rtcp) {
      return;
   }

   from = ast_json_object_get(json_blob, "from");
   to = ast_json_object_get(json_blob, "to");
   if (!from || !to) {
      return;
   }

   payload = ast_json_dump_string(json_rtcp);
   if (ast_strlen_zero(payload)) {
      return;
   }

   capture_info = hepv3_create_capture_info(payload, strlen(payload));
   if (!capture_info) {
      return;
   }
   ast_sockaddr_parse(&capture_info->src_addr, ast_json_string_get(from), PARSE_PORT_REQUIRE);
   ast_sockaddr_parse(&capture_info->dst_addr, ast_json_string_get(to), PARSE_PORT_REQUIRE);

   capture_info->uuid = assign_uuid(json_channel);
   if (!capture_info->uuid) {
      ao2_ref(capture_info, -1);
      return;
   }
   capture_info->capture_time = current_time;
   capture_info->capture_type = HEPV3_CAPTURE_TYPE_RTCP;
   capture_info->zipped = 0;

   hepv3_send_packet(capture_info);
}

static void rtp_topic_handler(void *data, struct stasis_subscription *sub, struct stasis_message *message)
{
   struct stasis_message_type *message_type = stasis_message_type(message);

   if ((message_type == ast_rtp_rtcp_sent_type()) ||
      (message_type == ast_rtp_rtcp_received_type())) {
      rtcp_message_handler(message);
   }
}

static int load_module(void)
{
   if (!hepv3_is_loaded()) {
      ast_log(AST_LOG_WARNING, "res_hep is disabled; declining module load\n");
      return AST_MODULE_LOAD_DECLINE;
   }

   stasis_rtp_subscription = stasis_subscribe(ast_rtp_topic(),
      rtp_topic_handler, NULL);
   if (!stasis_rtp_subscription) {
      return AST_MODULE_LOAD_DECLINE;
   }
   stasis_subscription_accept_message_type(stasis_rtp_subscription, ast_rtp_rtcp_sent_type());
   stasis_subscription_accept_message_type(stasis_rtp_subscription, ast_rtp_rtcp_received_type());
   stasis_subscription_set_filter(stasis_rtp_subscription, STASIS_SUBSCRIPTION_FILTER_SELECTIVE);

   return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module(void)
{
   if (stasis_rtp_subscription) {
      stasis_rtp_subscription = stasis_unsubscribe_and_join(stasis_rtp_subscription);
   }

   return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "RTCP HEPv3 Logger",
   .support_level = AST_MODULE_SUPPORT_EXTENDED,
   .load = load_module,
   .unload = unload_module,
   .requires = "res_hep",
);