res_pjsip_endpoint_identifier_anonymous.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, Digium, Inc.
 *
 * Mark Michelson <[email protected]>
 * Joshua Colp <[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.
 */

/*** MODULEINFO
 <depend>pjproject</depend>
 <depend>res_pjsip</depend>
 <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include <pjsip.h>

#include "asterisk/res_pjsip.h"
#include "asterisk/module.h"

static int get_endpoint_details(pjsip_rx_data *rdata, char *domain, size_t domain_size)
{
 pjsip_uri *from = rdata->msg_info.from->uri;
 pjsip_sip_uri *sip_from;
 if (!PJSIP_URI_SCHEME_IS_SIP(from) && !PJSIP_URI_SCHEME_IS_SIPS(from)) {
 return -1;
 }
 sip_from = (pjsip_sip_uri *) pjsip_uri_get_uri(from);
 ast_copy_pj_str(domain, &sip_from->host, domain_size);
 return 0;
}

static int find_transport_state_in_use(void *obj, void *arg, int flags)
{
 struct ast_sip_transport_state *transport_state = obj;
 pjsip_rx_data *rdata = arg;

 if (transport_state->transport == rdata->tp_info.transport
 || (transport_state->factory
 && !pj_strcmp(&transport_state->factory->addr_name.host, &rdata->tp_info.transport->local_name.host)
 && transport_state->factory->addr_name.port == rdata->tp_info.transport->local_name.port)) {
 return CMP_MATCH;
 }

 return 0;
}

#define DOMAIN_NAME_LEN 255

static struct ast_sip_endpoint *anonymous_identify(pjsip_rx_data *rdata)
{
 char domain_name[DOMAIN_NAME_LEN + 1];
 struct ast_sip_endpoint *endpoint;

 if (get_endpoint_details(rdata, domain_name, sizeof(domain_name))) {
 return NULL;
 }

 if (!ast_sip_get_disable_multi_domain()) {
 struct ast_sip_domain_alias *alias;
 struct ao2_container *transport_states;
 struct ast_sip_transport_state *transport_state = NULL;
 struct ast_sip_transport *transport = NULL;
 char id[sizeof("anonymous@") + DOMAIN_NAME_LEN];

 /* Attempt to find the endpoint given the name and domain provided */
 snprintf(id, sizeof(id), "anonymous@%s", domain_name);
 endpoint = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", id);
 if (endpoint) {
 goto done;
 }

 /* See if an alias exists for the domain provided */
 alias = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "domain_alias",
 domain_name);
 if (alias) {
 snprintf(id, sizeof(id), "anonymous@%s", alias->domain);
 ao2_ref(alias, -1);
 endpoint = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", id);
 if (endpoint) {
 goto done;
 }
 }

 /* See if the transport this came in on has a provided domain */
 if ((transport_states = ast_sip_get_transport_states())
 && (transport_state = ao2_callback(transport_states, 0, find_transport_state_in_use, rdata))
 && (transport = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "transport", transport_state->id))
 && !ast_strlen_zero(transport->domain)) {
 snprintf(id, sizeof(id), "anonymous@%s", transport->domain);
 endpoint = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", id);
 }
 ao2_cleanup(transport);
 ao2_cleanup(transport_state);
 ao2_cleanup(transport_states);
 if (endpoint) {
 goto done;
 }
 }

 /* Fall back to no domain */
 endpoint = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "endpoint", "anonymous");

done:
 if (endpoint) {
 ast_debug(3, "Retrieved anonymous endpoint '%s'\n", ast_sorcery_object_get_id(endpoint));
 }
 return endpoint;
}

static struct ast_sip_endpoint_identifier anonymous_identifier = {
 .identify_endpoint = anonymous_identify,
};

static int load_module(void)
{
 ast_sip_register_endpoint_identifier_with_name(&anonymous_identifier, "anonymous");
 return AST_MODULE_LOAD_SUCCESS;
}

static int unload_module(void)
{
 ast_sip_unregister_endpoint_identifier(&anonymous_identifier);
 return 0;
}

AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "PJSIP Anonymous endpoint identifier",
 .support_level = AST_MODULE_SUPPORT_CORE,
 .load = load_module,
 .unload = unload_module,
 .requires = "res_pjsip",
);