res_pjsip_endpoint_identifier_anonymous.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, Digium, Inc.
 *
 * Mark Michelson <mmichelson@digium.com>
 * Joshua Colp <jcolp@digium.com>
 *
 * 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;
    if (!ast_sip_is_uri_sip_sips(from)) {
        return -1;
    }
    ast_copy_pj_str(domain, ast_sip_pjsip_uri_get_hostname(from), 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",
);