717 lines
25 KiB
C
717 lines
25 KiB
C
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2015, 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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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjlib-util/errno.h>
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#include <arpa/nameser.h>
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#include "asterisk/astobj2.h"
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#include "asterisk/dns_core.h"
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#include "asterisk/dns_query_set.h"
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#include "asterisk/dns_srv.h"
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#include "asterisk/dns_naptr.h"
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#include "asterisk/res_pjsip.h"
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#include "include/res_pjsip_private.h"
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#include "asterisk/taskprocessor.h"
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#include "asterisk/threadpool.h"
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#ifdef HAVE_PJSIP_EXTERNAL_RESOLVER
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/*! \brief Structure which contains transport+port information for an active query */
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struct sip_target {
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/*! \brief The transport to be used */
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pjsip_transport_type_e transport;
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/*! \brief The port */
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int port;
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};
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/*! \brief The vector used for current targets */
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AST_VECTOR(targets, struct sip_target);
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/*! \brief Structure which keeps track of resolution */
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struct sip_resolve {
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/*! \brief Addresses currently being resolved, indexed based on index of queries in query set */
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struct targets resolving;
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/*! \brief Active queries */
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struct ast_dns_query_set *queries;
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/*! \brief Current viable server addresses */
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pjsip_server_addresses addresses;
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/*! \brief Serializer to run async callback into pjlib. */
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struct ast_taskprocessor *serializer;
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/*! \brief Callback to invoke upon completion */
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pjsip_resolver_callback *callback;
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/*! \brief User provided data */
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void *token;
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};
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/*! \brief Our own defined transports, reduces the size of sip_available_transports */
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enum sip_resolver_transport {
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SIP_RESOLVER_TRANSPORT_UDP,
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SIP_RESOLVER_TRANSPORT_TCP,
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SIP_RESOLVER_TRANSPORT_TLS,
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SIP_RESOLVER_TRANSPORT_UDP6,
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SIP_RESOLVER_TRANSPORT_TCP6,
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SIP_RESOLVER_TRANSPORT_TLS6,
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};
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/*! \brief Available transports on the system */
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static int sip_available_transports[] = {
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/* This is a list of transports with whether they are available as a valid transport
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* stored. We use our own identifier as to reduce the size of sip_available_transports.
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* As this array is only manipulated at startup it does not require a lock to protect
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* it.
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*/
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[SIP_RESOLVER_TRANSPORT_UDP] = 0,
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[SIP_RESOLVER_TRANSPORT_TCP] = 0,
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[SIP_RESOLVER_TRANSPORT_TLS] = 0,
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[SIP_RESOLVER_TRANSPORT_UDP6] = 0,
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[SIP_RESOLVER_TRANSPORT_TCP6] = 0,
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[SIP_RESOLVER_TRANSPORT_TLS6] = 0,
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};
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/*!
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* \internal
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* \brief Destroy resolution data
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*
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* \param data The resolution data to destroy
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*/
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static void sip_resolve_destroy(void *data)
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{
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struct sip_resolve *resolve = data;
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AST_VECTOR_FREE(&resolve->resolving);
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ao2_cleanup(resolve->queries);
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ast_taskprocessor_unreference(resolve->serializer);
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}
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/*!
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* \internal
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* \brief Check whether a transport is available or not
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*
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* \param transport The PJSIP transport type
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*
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* \return 1 success (transport is available)
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* \return 0 failure (transport is not available)
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*/
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static int sip_transport_is_available(enum pjsip_transport_type_e transport)
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{
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enum sip_resolver_transport resolver_transport;
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if (transport == PJSIP_TRANSPORT_UDP) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_UDP;
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} else if (transport == PJSIP_TRANSPORT_TCP) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_TCP;
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} else if (transport == PJSIP_TRANSPORT_TLS) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_TLS;
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} else if (transport == PJSIP_TRANSPORT_UDP6) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_UDP6;
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} else if (transport == PJSIP_TRANSPORT_TCP6) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_TCP6;
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} else if (transport == PJSIP_TRANSPORT_TLS6) {
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resolver_transport = SIP_RESOLVER_TRANSPORT_TLS6;
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} else {
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return 0;
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}
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return sip_available_transports[resolver_transport];
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}
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/*!
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* \internal
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* \brief Add a query to be resolved
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*
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* \param resolve The ongoing resolution
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* \param name What to resolve
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* \param rr_type The type of record to look up
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* \param rr_class The type of class to look up
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* \param transport The transport to use for any resulting records
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* \param port The port to use for any resulting records - if not specified the
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* default for the transport is used
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*
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* \retval 0 success
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* \retval -1 failure
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*/
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static int sip_resolve_add(struct sip_resolve *resolve, const char *name, int rr_type, int rr_class, pjsip_transport_type_e transport, int port)
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{
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struct sip_target target = {
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.transport = transport,
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.port = port,
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};
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if (!resolve->queries) {
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resolve->queries = ast_dns_query_set_create();
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if (!resolve->queries) {
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return -1;
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}
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}
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if (!port) {
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target.port = pjsip_transport_get_default_port_for_type(transport);
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}
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if (AST_VECTOR_APPEND(&resolve->resolving, target)) {
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return -1;
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}
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ast_debug(2, "[%p] Added target '%s' with record type '%d', transport '%s', and port '%d'\n",
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resolve, name, rr_type, pjsip_transport_get_type_desc(transport), target.port);
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return ast_dns_query_set_add(resolve->queries, name, rr_type, rr_class);
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}
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/*!
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* \internal
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* \brief Task used to invoke the user specific callback
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*
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* \param data The complete resolution
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*
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* \retval 0 Always
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*/
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static int sip_resolve_invoke_user_callback(void *data)
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{
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struct sip_resolve *resolve = data;
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if (DEBUG_ATLEAST(2)) {
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/* This includes space for the IP address, [, ], :, and the port */
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char addr[PJ_INET6_ADDRSTRLEN + 10];
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int idx;
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for (idx = 0; idx < resolve->addresses.count; ++idx) {
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pj_sockaddr_print(&resolve->addresses.entry[idx].addr, addr, sizeof(addr), 3);
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ast_log(LOG_DEBUG, "[%p] Address '%d' is %s with transport '%s'\n",
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resolve, idx, addr,
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pjsip_transport_get_type_desc(resolve->addresses.entry[idx].type));
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}
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}
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ast_debug(2, "[%p] Invoking user callback with '%d' addresses\n", resolve, resolve->addresses.count);
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resolve->callback(resolve->addresses.count ? PJ_SUCCESS : PJLIB_UTIL_EDNSNOANSWERREC, resolve->token, &resolve->addresses);
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ao2_ref(resolve, -1);
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return 0;
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}
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/*!
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* \internal
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* \brief Handle a NAPTR record according to RFC3263
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*
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* \param resolve The ongoing resolution
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* \param record The NAPTR record itself
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* \param service The service to look for
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* \param transport The transport to use for resulting queries
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*
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* \retval 0 success
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* \retval -1 failure (record not handled / supported)
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*/
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static int sip_resolve_handle_naptr(struct sip_resolve *resolve, const struct ast_dns_record *record,
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const char *service, pjsip_transport_type_e transport)
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{
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if (strcasecmp(ast_dns_naptr_get_service(record), service)) {
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return -1;
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}
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/* It is possible for us to receive an explicit transport that is already IPv6, in that case
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* we can't turn it into an IPv6 transport and check. If it's not IPv6 though we need to check
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* for both IPv4 and IPv6 as PJSIP does not provide enough differentiation to know that we
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* want only IPv4.
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*/
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if (!sip_transport_is_available(transport) &&
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(!(transport & PJSIP_TRANSPORT_IPV6) && !sip_transport_is_available(transport | PJSIP_TRANSPORT_IPV6))) {
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ast_debug(2, "[%p] NAPTR service %s skipped as transport is unavailable\n",
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resolve, service);
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return -1;
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}
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if (strcasecmp(ast_dns_naptr_get_flags(record), "s")) {
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ast_debug(2, "[%p] NAPTR service %s received with unsupported flags '%s'\n",
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resolve, service, ast_dns_naptr_get_flags(record));
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return -1;
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}
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if (ast_strlen_zero(ast_dns_naptr_get_replacement(record))) {
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return -1;
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}
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return sip_resolve_add(resolve, ast_dns_naptr_get_replacement(record), T_SRV, C_IN,
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transport, 0);
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}
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/*!
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* \internal
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* \brief Query set callback function, invoked when all queries have completed
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*
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* \param query_set The completed query set
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*/
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static void sip_resolve_callback(const struct ast_dns_query_set *query_set)
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{
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struct sip_resolve *resolve = ast_dns_query_set_get_data(query_set);
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struct ast_dns_query_set *queries = resolve->queries;
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struct targets resolving;
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int idx, address_count = 0, have_naptr = 0, have_srv = 0;
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unsigned short order = 0;
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int strict_order = 0;
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ast_debug(2, "[%p] All parallel queries completed\n", resolve);
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resolve->queries = NULL;
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/* This purposely steals the resolving list so we can add entries to the new one in
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* the same loop and also have access to the old.
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*/
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resolving = resolve->resolving;
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AST_VECTOR_INIT(&resolve->resolving, 0);
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/* The order of queries is what defines the preference order for the records within
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* this specific query set. The preference order overall is defined as a result of
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* drilling down from other records. Each completed query set replaces the results
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* of the last.
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*/
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for (idx = 0; idx < ast_dns_query_set_num_queries(queries); ++idx) {
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struct ast_dns_query *query = ast_dns_query_set_get(queries, idx);
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struct ast_dns_result *result = ast_dns_query_get_result(query);
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struct sip_target *target;
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const struct ast_dns_record *record;
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if (!result) {
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ast_debug(2, "[%p] No result information for target '%s' of type '%d'\n", resolve,
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ast_dns_query_get_name(query), ast_dns_query_get_rr_type(query));
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continue;
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}
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target = AST_VECTOR_GET_ADDR(&resolving, idx);
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for (record = ast_dns_result_get_records(result); record; record = ast_dns_record_get_next(record)) {
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if (ast_dns_record_get_rr_type(record) == T_A ||
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ast_dns_record_get_rr_type(record) == T_AAAA) {
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/* If NAPTR or SRV records exist the subsequent results from them take preference */
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if (have_naptr || have_srv) {
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ast_debug(2, "[%p] %s record being skipped on target '%s' because NAPTR or SRV record exists\n",
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resolve, ast_dns_record_get_rr_type(record) == T_A ? "A" : "AAAA",
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ast_dns_query_get_name(query));
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continue;
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}
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/* PJSIP has a fixed maximum number of addresses that can exist, so limit ourselves to that */
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if (address_count == PJSIP_MAX_RESOLVED_ADDRESSES) {
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break;
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}
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resolve->addresses.entry[address_count].type = target->transport;
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/* Populate address information for the new address entry */
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if (ast_dns_record_get_rr_type(record) == T_A) {
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ast_debug(2, "[%p] A record received on target '%s'\n", resolve, ast_dns_query_get_name(query));
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resolve->addresses.entry[address_count].addr_len = sizeof(pj_sockaddr_in);
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pj_sockaddr_init(pj_AF_INET(), &resolve->addresses.entry[address_count].addr, NULL,
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target->port);
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resolve->addresses.entry[address_count].addr.ipv4.sin_addr = *(pj_in_addr *) ast_dns_record_get_data(record);
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} else {
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ast_debug(2, "[%p] AAAA record received on target '%s'\n", resolve, ast_dns_query_get_name(query));
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resolve->addresses.entry[address_count].addr_len = sizeof(pj_sockaddr_in6);
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pj_sockaddr_init(pj_AF_INET6(), &resolve->addresses.entry[address_count].addr, NULL,
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target->port);
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pj_memcpy(&resolve->addresses.entry[address_count].addr.ipv6.sin6_addr, ast_dns_record_get_data(record),
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ast_dns_record_get_data_size(record));
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}
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address_count++;
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} else if (ast_dns_record_get_rr_type(record) == T_SRV) {
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if (have_naptr) {
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ast_debug(2, "[%p] SRV record being skipped on target '%s' because NAPTR record exists\n",
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resolve, ast_dns_query_get_name(query));
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continue;
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}
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/* SRV records just create new queries for AAAA+A, nothing fancy */
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ast_debug(2, "[%p] SRV record received on target '%s'\n", resolve, ast_dns_query_get_name(query));
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/* If an explicit IPv6 target transport has been requested look for only AAAA records */
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if ((target->transport & PJSIP_TRANSPORT_IPV6) &&
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sip_transport_is_available(target->transport)) {
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sip_resolve_add(resolve, ast_dns_srv_get_host(record), T_AAAA, C_IN, target->transport,
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ast_dns_srv_get_port(record));
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have_srv = 1;
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} else if (!(target->transport & PJSIP_TRANSPORT_IPV6) &&
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sip_transport_is_available(target->transport | PJSIP_TRANSPORT_IPV6)) {
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sip_resolve_add(resolve, ast_dns_srv_get_host(record), T_AAAA, C_IN, target->transport | PJSIP_TRANSPORT_IPV6,
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ast_dns_srv_get_port(record));
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have_srv = 1;
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}
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if (!(target->transport & PJSIP_TRANSPORT_IPV6) &&
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sip_transport_is_available(target->transport)) {
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sip_resolve_add(resolve, ast_dns_srv_get_host(record), T_A, C_IN, target->transport,
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ast_dns_srv_get_port(record));
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have_srv = 1;
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}
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} else if (ast_dns_record_get_rr_type(record) == T_NAPTR) {
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int added = -1;
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ast_debug(2, "[%p] NAPTR record received on target '%s'\n", resolve, ast_dns_query_get_name(query));
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if (strict_order && (ast_dns_naptr_get_order(record) != order)) {
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ast_debug(2, "[%p] NAPTR record skipped because order '%hu' does not match strict order '%hu'\n",
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resolve, ast_dns_naptr_get_order(record), order);
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continue;
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}
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if (target->transport == PJSIP_TRANSPORT_UNSPECIFIED || target->transport == PJSIP_TRANSPORT_UDP ||
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target->transport == PJSIP_TRANSPORT_UDP6) {
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added = sip_resolve_handle_naptr(resolve, record, "sip+d2u",
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target->transport == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP : target->transport);
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}
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||
|
if (target->transport == PJSIP_TRANSPORT_UNSPECIFIED || target->transport == PJSIP_TRANSPORT_TCP ||
|
||
|
target->transport == PJSIP_TRANSPORT_TCP6) {
|
||
|
added = sip_resolve_handle_naptr(resolve, record, "sip+d2t",
|
||
|
target->transport == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TCP : target->transport);
|
||
|
}
|
||
|
if (target->transport == PJSIP_TRANSPORT_UNSPECIFIED || target->transport == PJSIP_TRANSPORT_TLS ||
|
||
|
target->transport == PJSIP_TRANSPORT_TLS6) {
|
||
|
added = sip_resolve_handle_naptr(resolve, record, "sips+d2t",
|
||
|
target->transport == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TLS : target->transport);
|
||
|
}
|
||
|
|
||
|
/* If this record was successfully handled then we need to limit ourselves to this order */
|
||
|
if (!added) {
|
||
|
have_naptr = 1;
|
||
|
strict_order = 1;
|
||
|
order = ast_dns_naptr_get_order(record);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* Update the server addresses count, this is not limited as it can never exceed the max allowed */
|
||
|
resolve->addresses.count = address_count;
|
||
|
|
||
|
/* Free the vector we stole as we are responsible for it */
|
||
|
AST_VECTOR_FREE(&resolving);
|
||
|
|
||
|
/* If additional queries were added start the resolution process again */
|
||
|
if (resolve->queries) {
|
||
|
ast_debug(2, "[%p] New queries added, performing parallel resolution again\n", resolve);
|
||
|
ast_dns_query_set_resolve_async(resolve->queries, sip_resolve_callback, resolve);
|
||
|
ao2_ref(queries, -1);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
ast_debug(2, "[%p] Resolution completed - %d viable targets\n", resolve, resolve->addresses.count);
|
||
|
|
||
|
/* Push a task to invoke the callback, we do this so it is guaranteed to run in a PJSIP thread */
|
||
|
ao2_ref(resolve, +1);
|
||
|
if (ast_sip_push_task(resolve->serializer, sip_resolve_invoke_user_callback, resolve)) {
|
||
|
ao2_ref(resolve, -1);
|
||
|
}
|
||
|
|
||
|
ao2_ref(queries, -1);
|
||
|
}
|
||
|
|
||
|
/*!
|
||
|
* \internal
|
||
|
* \brief Determine what address family a host may be if it is already an IP address
|
||
|
*
|
||
|
* \param host The host (which may be an IP address)
|
||
|
*
|
||
|
* \retval 6 The host is an IPv6 address
|
||
|
* \retval 4 The host is an IPv4 address
|
||
|
* \retval 0 The host is not an IP address
|
||
|
*/
|
||
|
static int sip_resolve_get_ip_addr_ver(const pj_str_t *host)
|
||
|
{
|
||
|
pj_in_addr dummy;
|
||
|
pj_in6_addr dummy6;
|
||
|
|
||
|
if (pj_inet_aton(host, &dummy) > 0) {
|
||
|
return 4;
|
||
|
}
|
||
|
|
||
|
if (pj_inet_pton(pj_AF_INET6(), host, &dummy6) == PJ_SUCCESS) {
|
||
|
return 6;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*!
|
||
|
* \internal
|
||
|
* \brief Perform SIP resolution of a host
|
||
|
*
|
||
|
* \param resolver Configured resolver instance
|
||
|
* \param pool Memory pool to allocate things from
|
||
|
* \param target The target we are resolving
|
||
|
* \param token User data to pass to the resolver callback
|
||
|
* \param cb User resolver callback to invoke upon resolution completion
|
||
|
*/
|
||
|
static void sip_resolve(pjsip_resolver_t *resolver, pj_pool_t *pool, const pjsip_host_info *target,
|
||
|
void *token, pjsip_resolver_callback *cb)
|
||
|
{
|
||
|
int ip_addr_ver;
|
||
|
pjsip_transport_type_e type = target->type;
|
||
|
struct sip_resolve *resolve;
|
||
|
char host[NI_MAXHOST];
|
||
|
int res = 0;
|
||
|
|
||
|
ast_copy_pj_str(host, &target->addr.host, sizeof(host));
|
||
|
|
||
|
ast_debug(2, "Performing SIP DNS resolution of target '%s'\n", host);
|
||
|
|
||
|
/* If the provided target is already an address don't bother resolving */
|
||
|
ip_addr_ver = sip_resolve_get_ip_addr_ver(&target->addr.host);
|
||
|
|
||
|
/* Determine the transport to use if none has been explicitly specified */
|
||
|
if (type == PJSIP_TRANSPORT_UNSPECIFIED) {
|
||
|
/* If we've been told to use a secure or reliable transport restrict ourselves to that */
|
||
|
#if PJ_HAS_TCP
|
||
|
if (target->flag & PJSIP_TRANSPORT_SECURE) {
|
||
|
type = PJSIP_TRANSPORT_TLS;
|
||
|
} else if (target->flag & PJSIP_TRANSPORT_RELIABLE) {
|
||
|
type = PJSIP_TRANSPORT_TCP;
|
||
|
} else
|
||
|
#endif
|
||
|
/* According to the RFC otherwise if an explicit IP address OR an explicit port is specified
|
||
|
* we use UDP
|
||
|
*/
|
||
|
if (ip_addr_ver || target->addr.port) {
|
||
|
type = PJSIP_TRANSPORT_UDP;
|
||
|
}
|
||
|
|
||
|
if (ip_addr_ver == 6) {
|
||
|
type = (pjsip_transport_type_e)((int) type | PJSIP_TRANSPORT_IPV6);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ast_debug(2, "Transport type for target '%s' is '%s'\n", host, pjsip_transport_get_type_desc(type));
|
||
|
|
||
|
/* If it's already an address call the callback immediately */
|
||
|
if (ip_addr_ver) {
|
||
|
pjsip_server_addresses addresses = {
|
||
|
.entry[0].type = type,
|
||
|
.count = 1,
|
||
|
};
|
||
|
|
||
|
if (ip_addr_ver == 4) {
|
||
|
addresses.entry[0].addr_len = sizeof(pj_sockaddr_in);
|
||
|
pj_sockaddr_init(pj_AF_INET(), &addresses.entry[0].addr, NULL, 0);
|
||
|
pj_inet_aton(&target->addr.host, &addresses.entry[0].addr.ipv4.sin_addr);
|
||
|
} else {
|
||
|
addresses.entry[0].addr_len = sizeof(pj_sockaddr_in6);
|
||
|
pj_sockaddr_init(pj_AF_INET6(), &addresses.entry[0].addr, NULL, 0);
|
||
|
pj_inet_pton(pj_AF_INET6(), &target->addr.host, &addresses.entry[0].addr.ipv6.sin6_addr);
|
||
|
}
|
||
|
|
||
|
pj_sockaddr_set_port(&addresses.entry[0].addr, !target->addr.port ? pjsip_transport_get_default_port_for_type(type) : target->addr.port);
|
||
|
|
||
|
ast_debug(2, "Target '%s' is an IP address, skipping resolution\n", host);
|
||
|
|
||
|
cb(PJ_SUCCESS, token, &addresses);
|
||
|
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
resolve = ao2_alloc_options(sizeof(*resolve), sip_resolve_destroy, AO2_ALLOC_OPT_LOCK_NOLOCK);
|
||
|
if (!resolve) {
|
||
|
cb(PJ_ENOMEM, token, NULL);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
resolve->callback = cb;
|
||
|
resolve->token = token;
|
||
|
|
||
|
if (AST_VECTOR_INIT(&resolve->resolving, 4)) {
|
||
|
ao2_ref(resolve, -1);
|
||
|
cb(PJ_ENOMEM, token, NULL);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
ast_debug(2, "[%p] Created resolution tracking for target '%s'\n", resolve, host);
|
||
|
|
||
|
/* If no port has been specified we can do NAPTR + SRV */
|
||
|
if (!target->addr.port) {
|
||
|
char srv[NI_MAXHOST];
|
||
|
|
||
|
/* When resolving addresses PJSIP can request an explicit transport type. It will explicitly
|
||
|
* request an IPv6 transport if a message has been tagged to use an explicitly IPv6 transport.
|
||
|
* For other cases it can be left unspecified OR an explicit non-IPv6 transport can be requested.
|
||
|
* In the case where a non-IPv6 transport is requested there is no way to differentiate between
|
||
|
* a transport being requested as part of a SIP URI (sip:test.com;transport=tcp) and a message
|
||
|
* being tagged with a specific IPv4 transport. In this case we look for both IPv4 and IPv6 addresses.
|
||
|
* If a message has been tagged with a specific IPv4 transport the IPv6 addresses will simply
|
||
|
* be discarded. The code below and elsewhere handles the case where we know they requested IPv6
|
||
|
* explicitly and only looks for IPv6 records.
|
||
|
*/
|
||
|
|
||
|
res |= sip_resolve_add(resolve, host, T_NAPTR, C_IN, type, 0);
|
||
|
|
||
|
if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
|
||
|
(type == PJSIP_TRANSPORT_TLS && sip_transport_is_available(PJSIP_TRANSPORT_TLS)) ||
|
||
|
(type == PJSIP_TRANSPORT_TLS6 && sip_transport_is_available(PJSIP_TRANSPORT_TLS6))) {
|
||
|
if (snprintf(srv, sizeof(srv), "_sips._tcp.%s", host) < NI_MAXHOST) {
|
||
|
res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
|
||
|
type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TLS : type, 0);
|
||
|
}
|
||
|
}
|
||
|
if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
|
||
|
(type == PJSIP_TRANSPORT_TCP && sip_transport_is_available(PJSIP_TRANSPORT_TCP)) ||
|
||
|
(type == PJSIP_TRANSPORT_TCP6 && sip_transport_is_available(PJSIP_TRANSPORT_TCP6))) {
|
||
|
if (snprintf(srv, sizeof(srv), "_sip._tcp.%s", host) < NI_MAXHOST) {
|
||
|
res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
|
||
|
type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_TCP : type, 0);
|
||
|
}
|
||
|
}
|
||
|
if (type == PJSIP_TRANSPORT_UNSPECIFIED ||
|
||
|
(type == PJSIP_TRANSPORT_UDP && sip_transport_is_available(PJSIP_TRANSPORT_UDP)) ||
|
||
|
(type == PJSIP_TRANSPORT_UDP6 && sip_transport_is_available(PJSIP_TRANSPORT_UDP6))) {
|
||
|
if (snprintf(srv, sizeof(srv), "_sip._udp.%s", host) < NI_MAXHOST) {
|
||
|
res |= sip_resolve_add(resolve, srv, T_SRV, C_IN,
|
||
|
type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP : type, 0);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if ((type == PJSIP_TRANSPORT_UNSPECIFIED && sip_transport_is_available(PJSIP_TRANSPORT_UDP6)) ||
|
||
|
((type & PJSIP_TRANSPORT_IPV6) && sip_transport_is_available(type))) {
|
||
|
res |= sip_resolve_add(resolve, host, T_AAAA, C_IN, (type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP6 : type), target->addr.port);
|
||
|
} else if (!(type & PJSIP_TRANSPORT_IPV6) && sip_transport_is_available(type | PJSIP_TRANSPORT_IPV6)) {
|
||
|
res |= sip_resolve_add(resolve, host, T_AAAA, C_IN, type | PJSIP_TRANSPORT_IPV6, target->addr.port);
|
||
|
}
|
||
|
|
||
|
if ((type == PJSIP_TRANSPORT_UNSPECIFIED && sip_transport_is_available(PJSIP_TRANSPORT_UDP)) ||
|
||
|
(!(type & PJSIP_TRANSPORT_IPV6) && sip_transport_is_available(type))) {
|
||
|
res |= sip_resolve_add(resolve, host, T_A, C_IN, (type == PJSIP_TRANSPORT_UNSPECIFIED ? PJSIP_TRANSPORT_UDP : type), target->addr.port);
|
||
|
}
|
||
|
|
||
|
if (res) {
|
||
|
ao2_ref(resolve, -1);
|
||
|
cb(PJ_ENOMEM, token, NULL);
|
||
|
return;
|
||
|
}
|
||
|
if (!resolve->queries) {
|
||
|
ast_debug(2, "[%p] No resolution queries for target '%s'\n", resolve, host);
|
||
|
ao2_ref(resolve, -1);
|
||
|
cb(PJLIB_UTIL_EDNSNOANSWERREC, token, NULL);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
resolve->serializer = ao2_bump(ast_threadpool_serializer_get_current());
|
||
|
|
||
|
ast_debug(2, "[%p] Starting initial resolution using parallel queries for target '%s'\n", resolve, host);
|
||
|
ast_dns_query_set_resolve_async(resolve->queries, sip_resolve_callback, resolve);
|
||
|
|
||
|
ao2_ref(resolve, -1);
|
||
|
}
|
||
|
|
||
|
/*!
|
||
|
* \internal
|
||
|
* \brief Determine if a specific transport is configured on the system
|
||
|
*
|
||
|
* \param pool A memory pool to allocate things from
|
||
|
* \param transport The type of transport to check
|
||
|
* \param name A friendly name to print in the verbose message
|
||
|
*/
|
||
|
static void sip_check_transport(pj_pool_t *pool, pjsip_transport_type_e transport, const char *name)
|
||
|
{
|
||
|
pjsip_tpmgr_fla2_param prm;
|
||
|
enum sip_resolver_transport resolver_transport;
|
||
|
|
||
|
pjsip_tpmgr_fla2_param_default(&prm);
|
||
|
prm.tp_type = transport;
|
||
|
|
||
|
if (transport == PJSIP_TRANSPORT_UDP) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_UDP;
|
||
|
} else if (transport == PJSIP_TRANSPORT_TCP) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_TCP;
|
||
|
} else if (transport == PJSIP_TRANSPORT_TLS) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_TLS;
|
||
|
} else if (transport == PJSIP_TRANSPORT_UDP6) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_UDP6;
|
||
|
} else if (transport == PJSIP_TRANSPORT_TCP6) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_TCP6;
|
||
|
} else if (transport == PJSIP_TRANSPORT_TLS6) {
|
||
|
resolver_transport = SIP_RESOLVER_TRANSPORT_TLS6;
|
||
|
} else {
|
||
|
ast_verb(2, "'%s' is an unsupported SIP transport\n", name);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()),
|
||
|
pool, &prm) == PJ_SUCCESS) {
|
||
|
ast_verb(2, "'%s' is an available SIP transport\n", name);
|
||
|
sip_available_transports[resolver_transport] = 1;
|
||
|
} else {
|
||
|
ast_verb(2, "'%s' is not an available SIP transport, disabling resolver support for it\n",
|
||
|
name);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*! \brief External resolver implementation for PJSIP */
|
||
|
static pjsip_ext_resolver ext_resolver = {
|
||
|
.resolve = sip_resolve,
|
||
|
};
|
||
|
|
||
|
/*!
|
||
|
* \internal
|
||
|
* \brief Task to determine available transports and set ourselves an external resolver
|
||
|
*
|
||
|
* \retval 0 success
|
||
|
* \retval -1 failure
|
||
|
*/
|
||
|
static int sip_replace_resolver(void *data)
|
||
|
{
|
||
|
pj_pool_t *pool;
|
||
|
|
||
|
|
||
|
pool = pjsip_endpt_create_pool(ast_sip_get_pjsip_endpoint(), "Transport Availability", 256, 256);
|
||
|
if (!pool) {
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
/* Determine what transports are available on the system */
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_UDP, "UDP+IPv4");
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_TCP, "TCP+IPv4");
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_TLS, "TLS+IPv4");
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_UDP6, "UDP+IPv6");
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_TCP6, "TCP+IPv6");
|
||
|
sip_check_transport(pool, PJSIP_TRANSPORT_TLS6, "TLS+IPv6");
|
||
|
|
||
|
pjsip_endpt_release_pool(ast_sip_get_pjsip_endpoint(), pool);
|
||
|
|
||
|
/* Replace the PJSIP resolver with our own implementation */
|
||
|
pjsip_endpt_set_ext_resolver(ast_sip_get_pjsip_endpoint(), &ext_resolver);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
void ast_sip_initialize_resolver(void)
|
||
|
{
|
||
|
/* Replace the existing PJSIP resolver with our own implementation */
|
||
|
ast_sip_push_task_wait_servant(NULL, sip_replace_resolver, NULL);
|
||
|
}
|
||
|
|
||
|
#else
|
||
|
|
||
|
void ast_sip_initialize_resolver(void)
|
||
|
{
|
||
|
/* External resolver support does not exist in the version of PJSIP in use */
|
||
|
ast_log(LOG_NOTICE, "The version of PJSIP in use does not support external resolvers, using PJSIP provided resolver\n");
|
||
|
}
|
||
|
|
||
|
#endif
|