The first thing this patch fixes is UAS dialogs. Previously if a transport was configured on an endpoint and an inbound session was created there was no guarantee that requests sent on the dialog would use the correct transport and address information. This has now been fixed so an explicitly configured transport is taken into account. The second thing this patch fixes is res_pjsip_multihomed. The res_pjsip_multihomed module attempts to determine what transport a message should go out on and what addressing information should go into the message itself. In a scenario where multiple transports exist bound to the same IP address but a different port the code would incorrectly alter the transport and change the message to the wrong transport. This change makes the res_pjsip_multihomed module smarter so it will only change the transport and address information in the message when it is possible and makes sense. ASTERISK-24615 #close Reported by: David Justl Review: https://reviewboard.asterisk.org/r/4331/ ........ Merged revisions 430755 from http://svn.asterisk.org/svn/asterisk/branches/13 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@430756 65c4cc65-6c06-0410-ace0-fbb531ad65f3
237 lines
7.5 KiB
C
237 lines
7.5 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2014, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/module.h"
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/*! \brief Local host address for IPv4 */
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static char host_ipv4[PJ_INET_ADDRSTRLEN + 2];
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/*! \brief Local host address for IPv6 */
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static char host_ipv6[PJ_INET6_ADDRSTRLEN + 2];
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/*! \brief Helper function which returns a UDP transport bound to the given address and port */
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static pjsip_transport *multihomed_get_udp_transport(pj_str_t *address, int port)
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{
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struct ao2_container *transports = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "transport",
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AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL);
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struct ast_sip_transport *transport;
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struct ao2_iterator iter;
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pjsip_transport *sip_transport = NULL;
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if (!transports) {
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return NULL;
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}
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for (iter = ao2_iterator_init(transports, 0); (transport = ao2_iterator_next(&iter)); ao2_ref(transport, -1)) {
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if ((transport->type != AST_TRANSPORT_UDP) ||
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(pj_strcmp(&transport->state->transport->local_name.host, address)) ||
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(transport->state->transport->local_name.port != port)) {
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continue;
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}
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sip_transport = transport->state->transport;
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ao2_ref(transport, -1);
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break;
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}
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ao2_iterator_destroy(&iter);
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ao2_ref(transports, -1);
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return sip_transport;
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}
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/*! \brief Helper function which determines if the address within SDP should be rewritten */
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static int multihomed_rewrite_sdp(struct pjmedia_sdp_session *sdp)
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{
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if (!sdp->conn) {
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return 0;
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}
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/* If the host address is used in the SDP replace it with the address of what this is going out on */
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if ((!pj_strcmp2(&sdp->conn->addr_type, "IP4") && !pj_strcmp2(&sdp->conn->addr, host_ipv4)) ||
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(!pj_strcmp2(&sdp->conn->addr_type, "IP6") && !pj_strcmp2(&sdp->conn->addr, host_ipv6))) {
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return 1;
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}
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return 0;
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}
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/*! \brief Helper function which determines if a transport is bound to any */
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static int multihomed_bound_any(pjsip_transport *transport)
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{
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pj_uint32_t loop6[4] = {0, 0, 0, 0};
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if ((transport->local_addr.addr.sa_family == pj_AF_INET() &&
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transport->local_addr.ipv4.sin_addr.s_addr == PJ_INADDR_ANY) ||
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(transport->local_addr.addr.sa_family == pj_AF_INET6() &&
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!pj_memcmp(&transport->local_addr.ipv6.sin6_addr, loop6, sizeof(loop6)))) {
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return 1;
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}
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return 0;
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}
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static pj_status_t multihomed_on_tx_message(pjsip_tx_data *tdata)
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{
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pjsip_tpmgr_fla2_param prm;
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pjsip_cseq_hdr *cseq;
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pjsip_via_hdr *via;
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/* Use the destination information to determine what local interface this message will go out on */
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pjsip_tpmgr_fla2_param_default(&prm);
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prm.tp_type = tdata->tp_info.transport->key.type;
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pj_strset2(&prm.dst_host, tdata->tp_info.dst_name);
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prm.local_if = PJ_TRUE;
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/* If we can't get the local address use best effort and let it pass */
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if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()), tdata->pool, &prm) != PJ_SUCCESS) {
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return PJ_SUCCESS;
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}
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/* The port in the message should always be that of the original transport */
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prm.ret_port = tdata->tp_info.transport->local_name.port;
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/* If the IP source differs from the existing transport see if we need to update it */
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if (pj_strcmp(&prm.ret_addr, &tdata->tp_info.transport->local_name.host)) {
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/* If the transport it is going out on is different reflect it in the message */
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if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP ||
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tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
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pjsip_transport *transport;
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transport = multihomed_get_udp_transport(&prm.ret_addr, prm.ret_port);
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if (transport) {
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tdata->tp_info.transport = transport;
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}
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}
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/* If the chosen transport is not bound to any we can't use the source address as it won't get back to us */
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if (!multihomed_bound_any(tdata->tp_info.transport)) {
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pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host);
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}
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} else {
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/* The transport chosen will deliver this but ensure it is updated with the right information */
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pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host);
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}
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/* If the message needs to be updated with new address do so */
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if (tdata->msg->type == PJSIP_REQUEST_MSG || !(cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL)) ||
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pj_strcmp2(&cseq->method.name, "REGISTER")) {
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pjsip_contact_hdr *contact = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CONTACT, NULL);
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if (contact && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))) {
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pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);
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/* prm.ret_addr is allocated from the tdata pool OR the transport so it is perfectly fine to just do an assignment like this */
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pj_strassign(&uri->host, &prm.ret_addr);
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uri->port = prm.ret_port;
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pjsip_tx_data_invalidate_msg(tdata);
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}
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}
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if (tdata->msg->type == PJSIP_REQUEST_MSG && (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) {
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pj_strassign(&via->sent_by.host, &prm.ret_addr);
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via->sent_by.port = prm.ret_port;
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pjsip_tx_data_invalidate_msg(tdata);
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}
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/* Update the SDP if it is present */
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if (tdata->msg->body && ast_sip_is_content_type(&tdata->msg->body->content_type, "application", "sdp") &&
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multihomed_rewrite_sdp(tdata->msg->body->data)) {
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struct pjmedia_sdp_session *sdp = tdata->msg->body->data;
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int stream;
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pj_strassign(&sdp->conn->addr, &prm.ret_addr);
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for (stream = 0; stream < sdp->media_count; ++stream) {
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if (sdp->media[stream]->conn) {
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pj_strassign(&sdp->media[stream]->conn->addr, &prm.ret_addr);
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}
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}
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pjsip_tx_data_invalidate_msg(tdata);
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}
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return PJ_SUCCESS;
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}
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static pjsip_module multihomed_module = {
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.name = { "Multihomed Routing", 18 },
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.id = -1,
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.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 1,
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.on_tx_request = multihomed_on_tx_message,
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.on_tx_response = multihomed_on_tx_message,
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};
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static int unload_module(void)
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{
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ast_sip_unregister_service(&multihomed_module);
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return 0;
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}
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static int load_module(void)
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{
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char hostname[MAXHOSTNAMELEN] = "";
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pj_sockaddr addr;
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CHECK_PJSIP_MODULE_LOADED();
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if (!gethostname(hostname, sizeof(hostname) - 1)) {
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ast_verb(2, "Performing DNS resolution of local hostname '%s' to get local IPv4 and IPv6 address\n",
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hostname);
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}
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if (!pj_gethostip(pj_AF_INET(), &addr)) {
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pj_sockaddr_print(&addr, host_ipv4, sizeof(host_ipv4), 2);
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ast_verb(3, "Local IPv4 address determined to be: %s\n", host_ipv4);
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}
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if (!pj_gethostip(pj_AF_INET6(), &addr)) {
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pj_sockaddr_print(&addr, host_ipv6, sizeof(host_ipv6), 2);
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ast_verb(3, "Local IPv6 address determined to be: %s\n", host_ipv6);
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}
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if (ast_sip_register_service(&multihomed_module)) {
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ast_log(LOG_ERROR, "Could not register multihomed module for incoming and outgoing requests\n");
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return AST_MODULE_LOAD_FAILURE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Multihomed Routing Support",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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);
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