735b30ad71
The general gist is to have a clear boundary between old SIP stuff and new SIP stuff by having the word "SIP" for old stuff and "PJSIP" for new stuff. Here's a brief rundown of the changes: * The word "Gulp" in dialstrings, functions, and CLI commands is now "PJSIP" * chan_gulp.c is now chan_pjsip.c * Function names in chan_gulp.c that were "gulp_*" are now "chan_pjsip_*" * All files that were "res_sip*" are now "res_pjsip*" * The "res_sip" directory is now "res_pjsip" * Files in the "res_pjsip" directory that began with "sip_*" are now "pjsip_*" * The configuration file is now "pjsip.conf" instead of "res_sip.conf" * The module info for all PJSIP-related files now uses "PJSIP" instead of "SIP" * CLI and AMI commands created by Asterisk's PJSIP modules now have "pjsip" as the starting word instead of "sip" git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@395764 65c4cc65-6c06-0410-ace0-fbb531ad65f3
238 lines
7.8 KiB
C
238 lines
7.8 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, 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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#include "asterisk/acl.h"
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static pj_bool_t nat_on_rx_request(pjsip_rx_data *rdata)
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{
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RAII_VAR(struct ast_sip_endpoint *, endpoint, ast_pjsip_rdata_get_endpoint(rdata), ao2_cleanup);
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pjsip_contact_hdr *contact;
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if (!endpoint) {
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return PJ_FALSE;
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}
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if (endpoint->nat.rewrite_contact && (contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL)) &&
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(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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pj_cstr(&uri->host, rdata->pkt_info.src_name);
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uri->port = rdata->pkt_info.src_port;
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}
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if (endpoint->nat.force_rport) {
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rdata->msg_info.via->rport_param = 0;
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}
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return PJ_FALSE;
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}
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/*! \brief Structure which contains information about a transport */
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struct request_transport_details {
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/*! \brief Type of transport */
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enum ast_transport type;
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/*! \brief Potential pointer to the transport itself, if UDP */
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pjsip_transport *transport;
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/*! \brief Potential pointer to the transport factory itself, if TCP/TLS */
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pjsip_tpfactory *factory;
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/*! \brief Local address for transport */
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pj_str_t local_address;
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/*! \brief Local port for transport */
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int local_port;
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};
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/*! \brief Callback function for finding the transport the request is going out on */
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static int find_transport_in_use(void *obj, void *arg, int flags)
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{
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struct ast_sip_transport *transport = obj;
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struct request_transport_details *details = arg;
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/* If an explicit transport or factory matches then this is what is in use, if we are unavailable
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* to compare based on that we make sure that the type is the same and the source IP address/port are the same
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*/
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if ((details->transport && details->transport == transport->state->transport) ||
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(details->factory && details->factory == transport->state->factory) ||
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((details->type == transport->type) && (transport->state->factory) &&
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!pj_strcmp(&transport->state->factory->addr_name.host, &details->local_address) &&
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transport->state->factory->addr_name.port == details->local_port)) {
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return CMP_MATCH | CMP_STOP;
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}
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return 0;
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}
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/*! \brief Helper function which returns the SIP URI of a Contact header */
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static pjsip_sip_uri *nat_get_contact_sip_uri(pjsip_tx_data *tdata)
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{
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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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return NULL;
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}
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return pjsip_uri_get_uri(contact->uri);
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}
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/*! \brief Structure which contains hook details */
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struct nat_hook_details {
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/*! \brief Outgoing message itself */
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pjsip_tx_data *tdata;
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/*! \brief Chosen transport */
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struct ast_sip_transport *transport;
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};
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/*! \brief Callback function for invoking hooks */
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static int nat_invoke_hook(void *obj, void *arg, int flags)
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{
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struct ast_sip_nat_hook *hook = obj;
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struct nat_hook_details *details = arg;
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if (hook->outgoing_external_message) {
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hook->outgoing_external_message(details->tdata, details->transport);
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}
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return 0;
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}
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static pj_status_t nat_on_tx_message(pjsip_tx_data *tdata)
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{
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RAII_VAR(struct ao2_container *, transports, NULL, ao2_cleanup);
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RAII_VAR(struct ast_sip_transport *, transport, NULL, ao2_cleanup);
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struct request_transport_details details = { 0, };
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pjsip_via_hdr *via = NULL;
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struct ast_sockaddr addr = { { 0, } };
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pjsip_sip_uri *uri = NULL;
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RAII_VAR(struct ao2_container *, hooks, NULL, ao2_cleanup);
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/* If a transport selector is in use we know the transport or factory, so explicitly find it */
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if (tdata->tp_sel.type == PJSIP_TPSELECTOR_TRANSPORT) {
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details.transport = tdata->tp_sel.u.transport;
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} else if (tdata->tp_sel.type == PJSIP_TPSELECTOR_LISTENER) {
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details.factory = tdata->tp_sel.u.listener;
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} else if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP || tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
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/* Connectionless uses the same transport for all requests */
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details.type = AST_TRANSPORT_UDP;
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details.transport = tdata->tp_info.transport;
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} else {
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if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_TCP) {
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details.type = AST_TRANSPORT_TCP;
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} else if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_TLS) {
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details.type = AST_TRANSPORT_TLS;
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} else {
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/* Unknown transport type, we can't map and thus can't apply NAT changes */
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return PJ_SUCCESS;
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}
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if ((uri = nat_get_contact_sip_uri(tdata))) {
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details.local_address = uri->host;
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details.local_port = uri->port;
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} else if ((tdata->msg->type == PJSIP_REQUEST_MSG) &&
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(via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) {
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details.local_address = via->sent_by.host;
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details.local_port = via->sent_by.port;
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} else {
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return PJ_SUCCESS;
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}
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if (!details.local_port) {
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details.local_port = (details.type == AST_TRANSPORT_TLS) ? 5061 : 5060;
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}
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}
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if (!(transports = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "transport", AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL)) ||
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!(transport = ao2_callback(transports, 0, find_transport_in_use, &details)) || !transport->localnet ||
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ast_sockaddr_isnull(&transport->external_address)) {
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return PJ_SUCCESS;
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}
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ast_sockaddr_parse(&addr, tdata->tp_info.dst_name, PARSE_PORT_FORBID);
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ast_sockaddr_set_port(&addr, tdata->tp_info.dst_port);
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/* See if where we are sending this request is local or not, and if not that we can get a Contact URI to modify */
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if (ast_apply_ha(transport->localnet, &addr) != AST_SENSE_ALLOW) {
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return PJ_SUCCESS;
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}
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/* Update the contact header with the external address */
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if (uri || (uri = nat_get_contact_sip_uri(tdata))) {
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pj_strdup2(tdata->pool, &uri->host, ast_sockaddr_stringify_host(&transport->external_address));
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if (transport->external_signaling_port) {
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uri->port = transport->external_signaling_port;
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}
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}
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/* Update the via header if relevant */
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if ((tdata->msg->type == PJSIP_REQUEST_MSG) && (via || (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL)))) {
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pj_strdup2(tdata->pool, &via->sent_by.host, ast_sockaddr_stringify_host(&transport->external_address));
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if (transport->external_signaling_port) {
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via->sent_by.port = transport->external_signaling_port;
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}
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}
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/* Invoke any additional hooks that may be registered */
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if ((hooks = ast_sorcery_retrieve_by_fields(ast_sip_get_sorcery(), "nat_hook", AST_RETRIEVE_FLAG_MULTIPLE | AST_RETRIEVE_FLAG_ALL, NULL))) {
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struct nat_hook_details hook_details = {
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.tdata = tdata,
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.transport = transport,
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};
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ao2_callback(hooks, 0, nat_invoke_hook, &hook_details);
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}
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return PJ_SUCCESS;
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}
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static pjsip_module nat_module = {
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.name = { "NAT", 3 },
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.id = -1,
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.priority = PJSIP_MOD_PRIORITY_TSX_LAYER - 2,
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.on_rx_request = nat_on_rx_request,
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.on_tx_request = nat_on_tx_message,
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.on_tx_response = nat_on_tx_message,
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};
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static int load_module(void)
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{
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ast_sip_register_service(&nat_module);
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return AST_MODULE_LOAD_SUCCESS;
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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(&nat_module);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP NAT Support",
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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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