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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2014, Digium, Inc.
*
* 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 <pjsip_ua.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/module.h"
/*! \brief Local host address for IPv4 */
static char host_ipv4[PJ_INET_ADDRSTRLEN + 2];
/*! \brief Local host address for IPv6 */
static char host_ipv6[PJ_INET6_ADDRSTRLEN + 2];
/*! \brief Helper function which returns a UDP transport bound to the given address and port */
static pjsip_transport *multihomed_get_udp_transport(pj_str_t *address, int port)
{
struct ao2_container *transports = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "transport",
AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL);
struct ast_sip_transport *transport;
struct ao2_iterator iter;
pjsip_transport *sip_transport = NULL;
if (!transports) {
return NULL;
}
for (iter = ao2_iterator_init(transports, 0); (transport = ao2_iterator_next(&iter)); ao2_ref(transport, -1)) {
if ((transport->type != AST_TRANSPORT_UDP) ||
(pj_strcmp(&transport->state->transport->local_name.host, address)) ||
(transport->state->transport->local_name.port != port)) {
continue;
}
sip_transport = transport->state->transport;
ao2_ref(transport, -1);
break;
}
ao2_iterator_destroy(&iter);
ao2_ref(transports, -1);
return sip_transport;
}
/*! \brief Helper function which determines if the address within SDP should be rewritten */
static int multihomed_rewrite_sdp(struct pjmedia_sdp_session *sdp)
{
if (!sdp->conn) {
return 0;
}
/* If the host address is used in the SDP replace it with the address of what this is going out on */
if ((!pj_strcmp2(&sdp->conn->addr_type, "IP4") && !pj_strcmp2(&sdp->conn->addr, host_ipv4)) ||
(!pj_strcmp2(&sdp->conn->addr_type, "IP6") && !pj_strcmp2(&sdp->conn->addr, host_ipv6))) {
return 1;
}
return 0;
}
static pj_status_t multihomed_on_tx_message(pjsip_tx_data *tdata)
{
pjsip_tpmgr_fla2_param prm;
pjsip_transport *transport;
pjsip_contact_hdr *contact;
pjsip_via_hdr *via;
/* Use the destination information to determine what local interface this message will go out on */
pjsip_tpmgr_fla2_param_default(&prm);
prm.tp_type = tdata->tp_info.transport->key.type;
pj_strset2(&prm.dst_host, tdata->tp_info.dst_name);
prm.local_if = PJ_TRUE;
/* If we can't get the local address use best effort and let it pass */
if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()), tdata->pool, &prm) != PJ_SUCCESS) {
return PJ_SUCCESS;
}
/* If the transport it is going out on is different reflect it in the message */
transport = multihomed_get_udp_transport(&prm.ret_addr, prm.ret_port);
if (transport && (tdata->tp_info.transport != transport)) {
tdata->tp_info.transport = transport;
}
/* If the message needs to be updated with new address do so */
contact = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CONTACT, NULL);
if (contact && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
/* prm.ret_addr is allocated from the tdata pool so it is perfectly fine to just do an assignment like this */
pj_strassign(&uri->host, &prm.ret_addr);
uri->port = prm.ret_port;
pjsip_tx_data_invalidate_msg(tdata);
}
if (tdata->msg->type == PJSIP_REQUEST_MSG && (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) {
pj_strassign(&via->sent_by.host, &prm.ret_addr);
via->sent_by.port = prm.ret_port;
pjsip_tx_data_invalidate_msg(tdata);
}
/* Update the SDP if it is present */
if (tdata->msg->body && ast_sip_is_content_type(&tdata->msg->body->content_type, "application", "sdp") &&
multihomed_rewrite_sdp(tdata->msg->body->data)) {
struct pjmedia_sdp_session *sdp = tdata->msg->body->data;
int stream;
pj_strassign(&sdp->conn->addr, &prm.ret_addr);
for (stream = 0; stream < sdp->media_count; ++stream) {
if (sdp->media[stream]->conn) {
pj_strassign(&sdp->media[stream]->conn->addr, &prm.ret_addr);
}
}
pjsip_tx_data_invalidate_msg(tdata);
}
return PJ_SUCCESS;
}
static pjsip_module multihomed_module = {
.name = { "Multihomed Routing", 18 },
.id = -1,
.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 1,
.on_tx_request = multihomed_on_tx_message,
.on_tx_response = multihomed_on_tx_message,
};
static int unload_module(void)
{
ast_sip_unregister_service(&multihomed_module);
return 0;
}
static int load_module(void)
{
pj_sockaddr addr;
if (!pj_gethostip(pj_AF_INET(), &addr)) {
pj_sockaddr_print(&addr, host_ipv4, sizeof(host_ipv4), 2);
}
if (!pj_gethostip(pj_AF_INET6(), &addr)) {
pj_sockaddr_print(&addr, host_ipv6, sizeof(host_ipv6), 2);
}
if (ast_sip_register_service(&multihomed_module)) {
ast_log(LOG_ERROR, "Could not register multihomed module for incoming and outgoing requests\n");
return AST_MODULE_LOAD_FAILURE;
}
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Multihomed Routing Support",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
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