c47787feab
For a complete list of the options added, see the review linked at the bottom of this commit message. (closes issue ASTERISK-21506) reported by Matt Jordan Review: https://reviewboard.asterisk.org/r/2671 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394759 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1156 lines
34 KiB
C
1156 lines
34 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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* Mark Michelson <mmichelson@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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/*!
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* \brief Opaque structure representing an RFC 3265 SIP subscription
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_sip</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_simple.h>
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#include <pjlib.h>
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#include "asterisk/res_sip_pubsub.h"
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#include "asterisk/module.h"
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#include "asterisk/linkedlists.h"
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#include "asterisk/astobj2.h"
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#include "asterisk/datastore.h"
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#include "asterisk/uuid.h"
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#include "asterisk/taskprocessor.h"
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#include "asterisk/sched.h"
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#include "asterisk/res_sip.h"
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static pj_bool_t pubsub_on_rx_request(pjsip_rx_data *rdata);
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static struct pjsip_module pubsub_module = {
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.name = { "PubSub Module", 13 },
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.priority = PJSIP_MOD_PRIORITY_APPLICATION,
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.on_rx_request = pubsub_on_rx_request,
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};
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static const pj_str_t str_event_name = { "Event", 5 };
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/*! \brief Scheduler used for automatically expiring publications */
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static struct ast_sched_context *sched;
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/*! \brief Number of buckets for publications (on a per handler) */
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#define PUBLICATIONS_BUCKETS 37
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/*! \brief Default expiration time for PUBLISH if one is not specified */
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#define DEFAULT_PUBLISH_EXPIRES 3600
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/*! \brief Defined method for PUBLISH */
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const pjsip_method pjsip_publish_method =
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{
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PJSIP_OTHER_METHOD,
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{ "PUBLISH", 7 }
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};
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/*!
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* \brief The types of PUBLISH messages defined in RFC 3903
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*/
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enum sip_publish_type {
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/*!
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* \brief Unknown
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*
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* \details
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* This actually is not defined in RFC 3903. We use this as a constant
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* to indicate that an incoming PUBLISH does not fit into any of the
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* other categories and is thus invalid.
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*/
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SIP_PUBLISH_UNKNOWN,
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/*!
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* \brief Initial
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*
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* \details
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* The first PUBLISH sent. This will contain a non-zero Expires header
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* as well as a body that indicates the current state of the endpoint
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* that has sent the message. The initial PUBLISH is the only type
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* of PUBLISH to not contain a Sip-If-Match header in it.
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*/
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SIP_PUBLISH_INITIAL,
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/*!
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* \brief Refresh
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*
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* \details
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* Used to keep a published state from expiring. This will contain a
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* non-zero Expires header but no body since its purpose is not to
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* update state.
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*/
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SIP_PUBLISH_REFRESH,
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/*!
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* \brief Modify
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*
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* \details
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* Used to change state from its previous value. This will contain
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* a body updating the published state. May or may not contain an
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* Expires header.
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*/
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SIP_PUBLISH_MODIFY,
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/*!
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* \brief Remove
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*
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* \details
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* Used to remove published state from an ESC. This will contain
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* an Expires header set to 0 and likely no body.
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*/
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SIP_PUBLISH_REMOVE,
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};
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/*!
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* Used to create new entity IDs by ESCs.
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*/
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static int esc_etag_counter;
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/*!
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* \brief Structure representing a SIP publication
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*/
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struct ast_sip_publication {
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/*! Publication datastores set up by handlers */
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struct ao2_container *datastores;
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/*! \brief Entity tag for the publication */
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int entity_tag;
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/*! \brief Handler for this publication */
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struct ast_sip_publish_handler *handler;
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/*! \brief The endpoint with which the subscription is communicating */
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struct ast_sip_endpoint *endpoint;
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/*! \brief Expiration time of the publication */
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int expires;
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/*! \brief Scheduled item for expiration of publication */
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int sched_id;
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};
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/*!
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* \brief Structure representing a SIP subscription
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*/
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struct ast_sip_subscription {
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/*! Subscription datastores set up by handlers */
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struct ao2_container *datastores;
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/*! The endpoint with which the subscription is communicating */
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struct ast_sip_endpoint *endpoint;
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/*! Serializer on which to place operations for this subscription */
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struct ast_taskprocessor *serializer;
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/*! The handler for this subscription */
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const struct ast_sip_subscription_handler *handler;
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/*! The role for this subscription */
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enum ast_sip_subscription_role role;
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/*! The underlying PJSIP event subscription structure */
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pjsip_evsub *evsub;
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/*! The underlying PJSIP dialog */
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pjsip_dialog *dlg;
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};
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#define DATASTORE_BUCKETS 53
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#define DEFAULT_EXPIRES 3600
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static int datastore_hash(const void *obj, int flags)
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{
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const struct ast_datastore *datastore = obj;
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const char *uid = flags & OBJ_KEY ? obj : datastore->uid;
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ast_assert(uid != NULL);
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return ast_str_hash(uid);
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}
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static int datastore_cmp(void *obj, void *arg, int flags)
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{
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const struct ast_datastore *datastore1 = obj;
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const struct ast_datastore *datastore2 = arg;
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const char *uid2 = flags & OBJ_KEY ? arg : datastore2->uid;
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ast_assert(datastore1->uid != NULL);
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ast_assert(uid2 != NULL);
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return strcmp(datastore1->uid, uid2) ? 0 : CMP_MATCH | CMP_STOP;
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}
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static void subscription_destructor(void *obj)
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{
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struct ast_sip_subscription *sub = obj;
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ast_debug(3, "Destroying SIP subscription\n");
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ao2_cleanup(sub->datastores);
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ao2_cleanup(sub->endpoint);
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if (sub->dlg) {
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/* This is why we keep the dialog on the subscription. When the subscription
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* is destroyed, there is no guarantee that the underlying dialog is ready
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* to be destroyed. Furthermore, there's no guarantee in the opposite direction
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* either. The dialog could be destroyed before our subscription is. We fix
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* this problem by keeping a reference to the dialog until it is time to
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* destroy the subscription. We need to have the dialog available when the
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* subscription is destroyed so that we can guarantee that our attempt to
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* remove the serializer will be successful.
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*/
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ast_sip_dialog_set_serializer(sub->dlg, NULL);
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pjsip_dlg_dec_session(sub->dlg, &pubsub_module);
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}
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ast_taskprocessor_unreference(sub->serializer);
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}
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static void pubsub_on_evsub_state(pjsip_evsub *sub, pjsip_event *event);
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static void pubsub_on_tsx_state(pjsip_evsub *sub, pjsip_transaction *tsx, pjsip_event *event);
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static void pubsub_on_rx_refresh(pjsip_evsub *sub, pjsip_rx_data *rdata,
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int *p_st_code, pj_str_t **p_st_text, pjsip_hdr *res_hdr, pjsip_msg_body **p_body);
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static void pubsub_on_rx_notify(pjsip_evsub *sub, pjsip_rx_data *rdata, int *p_st_code,
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pj_str_t **p_st_text, pjsip_hdr *res_hdr, pjsip_msg_body **p_body);
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static void pubsub_on_client_refresh(pjsip_evsub *sub);
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static void pubsub_on_server_timeout(pjsip_evsub *sub);
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static pjsip_evsub_user pubsub_cb = {
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.on_evsub_state = pubsub_on_evsub_state,
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.on_tsx_state = pubsub_on_tsx_state,
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.on_rx_refresh = pubsub_on_rx_refresh,
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.on_rx_notify = pubsub_on_rx_notify,
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.on_client_refresh = pubsub_on_client_refresh,
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.on_server_timeout = pubsub_on_server_timeout,
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};
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static pjsip_evsub *allocate_evsub(const char *event, enum ast_sip_subscription_role role,
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struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata, pjsip_dialog *dlg)
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{
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pjsip_evsub *evsub;
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/* PJSIP is kind enough to have some built-in support for certain
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* events. We need to use the correct initialization function for the
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* built-in events
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*/
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if (role == AST_SIP_NOTIFIER) {
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if (!strcmp(event, "message-summary")) {
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pjsip_mwi_create_uas(dlg, &pubsub_cb, rdata, &evsub);
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} else {
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pjsip_evsub_create_uas(dlg, &pubsub_cb, rdata, 0, &evsub);
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}
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} else {
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if (!strcmp(event, "message-summary")) {
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pjsip_mwi_create_uac(dlg, &pubsub_cb, 0, &evsub);
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} else {
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pj_str_t pj_event;
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pj_cstr(&pj_event, event);
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pjsip_evsub_create_uac(dlg, &pubsub_cb, &pj_event, 0, &evsub);
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}
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}
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return evsub;
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}
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struct ast_sip_subscription *ast_sip_create_subscription(const struct ast_sip_subscription_handler *handler,
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enum ast_sip_subscription_role role, struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata)
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{
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struct ast_sip_subscription *sub = ao2_alloc(sizeof(*sub), subscription_destructor);
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pjsip_dialog *dlg;
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if (!sub) {
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return NULL;
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}
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sub->datastores = ao2_container_alloc(DATASTORE_BUCKETS, datastore_hash, datastore_cmp);
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if (!sub->datastores) {
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ao2_ref(sub, -1);
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return NULL;
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}
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sub->serializer = ast_sip_create_serializer();
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if (!sub->serializer) {
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ao2_ref(sub, -1);
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return NULL;
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}
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sub->role = role;
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if (role == AST_SIP_NOTIFIER) {
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pjsip_dlg_create_uas(pjsip_ua_instance(), rdata, NULL, &dlg);
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} else {
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RAII_VAR(struct ast_sip_contact *, contact, NULL, ao2_cleanup);
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contact = ast_sip_location_retrieve_contact_from_aor_list(endpoint->aors);
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if (!contact || ast_strlen_zero(contact->uri)) {
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ast_log(LOG_WARNING, "No contacts configured for endpoint %s. Unable to create SIP subsription\n",
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ast_sorcery_object_get_id(endpoint));
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ao2_ref(sub, -1);
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return NULL;
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}
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dlg = ast_sip_create_dialog(endpoint, contact->uri, NULL);
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}
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if (!dlg) {
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ast_log(LOG_WARNING, "Unable to create dialog for SIP subscription\n");
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ao2_ref(sub, -1);
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return NULL;
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}
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sub->evsub = allocate_evsub(handler->event_name, role, endpoint, rdata, dlg);
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/* We keep a reference to the dialog until our subscription is destroyed. See
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* the subscription_destructor for more details
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*/
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pjsip_dlg_inc_session(dlg, &pubsub_module);
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sub->dlg = dlg;
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ast_sip_dialog_set_serializer(dlg, sub->serializer);
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pjsip_evsub_set_mod_data(sub->evsub, pubsub_module.id, sub);
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ao2_ref(endpoint, +1);
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sub->endpoint = endpoint;
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sub->handler = handler;
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return sub;
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}
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struct ast_sip_endpoint *ast_sip_subscription_get_endpoint(struct ast_sip_subscription *sub)
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{
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ast_assert(sub->endpoint != NULL);
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ao2_ref(sub->endpoint, +1);
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return sub->endpoint;
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}
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struct ast_taskprocessor *ast_sip_subscription_get_serializer(struct ast_sip_subscription *sub)
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{
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ast_assert(sub->serializer != NULL);
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return sub->serializer;
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}
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pjsip_evsub *ast_sip_subscription_get_evsub(struct ast_sip_subscription *sub)
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{
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return sub->evsub;
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}
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pjsip_dialog *ast_sip_subscription_get_dlg(struct ast_sip_subscription *sub)
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{
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return sub->dlg;
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}
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int ast_sip_subscription_send_request(struct ast_sip_subscription *sub, pjsip_tx_data *tdata)
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{
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return pjsip_evsub_send_request(ast_sip_subscription_get_evsub(sub),
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tdata) == PJ_SUCCESS ? 0 : -1;
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}
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static void subscription_datastore_destroy(void *obj)
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{
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struct ast_datastore *datastore = obj;
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/* Using the destroy function (if present) destroy the data */
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if (datastore->info->destroy != NULL && datastore->data != NULL) {
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datastore->info->destroy(datastore->data);
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datastore->data = NULL;
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}
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ast_free((void *) datastore->uid);
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datastore->uid = NULL;
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}
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struct ast_datastore *ast_sip_subscription_alloc_datastore(const struct ast_datastore_info *info, const char *uid)
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{
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RAII_VAR(struct ast_datastore *, datastore, NULL, ao2_cleanup);
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const char *uid_ptr = uid;
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if (!info) {
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return NULL;
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}
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datastore = ao2_alloc(sizeof(*datastore), subscription_datastore_destroy);
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if (!datastore) {
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return NULL;
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}
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datastore->info = info;
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if (ast_strlen_zero(uid)) {
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/* They didn't provide an ID so we'll provide one ourself */
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struct ast_uuid *uuid = ast_uuid_generate();
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char uuid_buf[AST_UUID_STR_LEN];
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if (!uuid) {
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return NULL;
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}
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uid_ptr = ast_uuid_to_str(uuid, uuid_buf, sizeof(uuid_buf));
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ast_free(uuid);
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}
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datastore->uid = ast_strdup(uid_ptr);
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if (!datastore->uid) {
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return NULL;
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}
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ao2_ref(datastore, +1);
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return datastore;
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}
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int ast_sip_subscription_add_datastore(struct ast_sip_subscription *subscription, struct ast_datastore *datastore)
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{
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ast_assert(datastore != NULL);
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ast_assert(datastore->info != NULL);
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ast_assert(!ast_strlen_zero(datastore->uid));
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if (!ao2_link(subscription->datastores, datastore)) {
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return -1;
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}
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return 0;
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}
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struct ast_datastore *ast_sip_subscription_get_datastore(struct ast_sip_subscription *subscription, const char *name)
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{
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return ao2_find(subscription->datastores, name, OBJ_KEY);
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}
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void ast_sip_subscription_remove_datastore(struct ast_sip_subscription *subscription, const char *name)
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{
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ao2_callback(subscription->datastores, OBJ_KEY | OBJ_UNLINK | OBJ_NODATA, NULL, (void *) name);
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}
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int ast_sip_publication_add_datastore(struct ast_sip_publication *publication, struct ast_datastore *datastore)
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{
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ast_assert(datastore != NULL);
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ast_assert(datastore->info != NULL);
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ast_assert(!ast_strlen_zero(datastore->uid));
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if (!ao2_link(publication->datastores, datastore)) {
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return -1;
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}
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return 0;
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}
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struct ast_datastore *ast_sip_publication_get_datastore(struct ast_sip_publication *publication, const char *name)
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{
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return ao2_find(publication->datastores, name, OBJ_KEY);
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}
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void ast_sip_publication_remove_datastore(struct ast_sip_publication *publication, const char *name)
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{
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ao2_callback(publication->datastores, OBJ_KEY | OBJ_UNLINK | OBJ_NODATA, NULL, (void *) name);
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}
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AST_RWLIST_HEAD_STATIC(publish_handlers, ast_sip_publish_handler);
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static int publication_hash_fn(const void *obj, const int flags)
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{
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const struct ast_sip_publication *publication = obj;
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const int *entity_tag = obj;
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return flags & OBJ_KEY ? *entity_tag : publication->entity_tag;
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}
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static int publication_cmp_fn(void *obj, void *arg, int flags)
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{
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const struct ast_sip_publication *publication1 = obj;
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const struct ast_sip_publication *publication2 = arg;
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const int *entity_tag = arg;
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return (publication1->entity_tag == (flags & OBJ_KEY ? *entity_tag : publication2->entity_tag) ?
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CMP_MATCH | CMP_STOP : 0);
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}
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static void publish_add_handler(struct ast_sip_publish_handler *handler)
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{
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SCOPED_LOCK(lock, &publish_handlers, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
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AST_RWLIST_INSERT_TAIL(&publish_handlers, handler, next);
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}
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int ast_sip_register_publish_handler(struct ast_sip_publish_handler *handler)
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{
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if (ast_strlen_zero(handler->event_name)) {
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ast_log(LOG_ERROR, "No event package specified for publish handler. Cannot register\n");
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return -1;
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}
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if (!(handler->publications = ao2_container_alloc(PUBLICATIONS_BUCKETS,
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publication_hash_fn, publication_cmp_fn))) {
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ast_log(LOG_ERROR, "Could not allocate publications container for event '%s'\n",
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|
handler->event_name);
|
|
return -1;
|
|
}
|
|
|
|
publish_add_handler(handler);
|
|
|
|
ast_module_ref(ast_module_info->self);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void ast_sip_unregister_publish_handler(struct ast_sip_publish_handler *handler)
|
|
{
|
|
struct ast_sip_publish_handler *iter;
|
|
SCOPED_LOCK(lock, &publish_handlers, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
|
|
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&publish_handlers, iter, next) {
|
|
if (handler == iter) {
|
|
AST_RWLIST_REMOVE_CURRENT(next);
|
|
ao2_cleanup(handler->publications);
|
|
ast_module_unref(ast_module_info->self);
|
|
break;
|
|
}
|
|
}
|
|
AST_RWLIST_TRAVERSE_SAFE_END;
|
|
}
|
|
|
|
AST_RWLIST_HEAD_STATIC(subscription_handlers, ast_sip_subscription_handler);
|
|
|
|
static void sub_add_handler(struct ast_sip_subscription_handler *handler)
|
|
{
|
|
SCOPED_LOCK(lock, &subscription_handlers, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
|
|
AST_RWLIST_INSERT_TAIL(&subscription_handlers, handler, next);
|
|
ast_module_ref(ast_module_info->self);
|
|
}
|
|
|
|
static int sub_handler_exists_for_event_name(const char *event_name)
|
|
{
|
|
struct ast_sip_subscription_handler *iter;
|
|
SCOPED_LOCK(lock, &subscription_handlers, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
|
|
|
|
AST_RWLIST_TRAVERSE(&subscription_handlers, iter, next) {
|
|
if (!strcmp(iter->event_name, event_name)) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ast_sip_register_subscription_handler(struct ast_sip_subscription_handler *handler)
|
|
{
|
|
pj_str_t accept[AST_SIP_MAX_ACCEPT];
|
|
int i;
|
|
|
|
if (ast_strlen_zero(handler->event_name)) {
|
|
ast_log(LOG_ERROR, "No event package specifief for subscription handler. Cannot register\n");
|
|
return -1;
|
|
}
|
|
|
|
if (ast_strlen_zero(handler->accept[0])) {
|
|
ast_log(LOG_ERROR, "Subscription handler must supply at least one 'Accept' format\n");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < AST_SIP_MAX_ACCEPT && !ast_strlen_zero(handler->accept[i]); ++i) {
|
|
pj_cstr(&accept[i], handler->accept[i]);
|
|
}
|
|
|
|
if (!sub_handler_exists_for_event_name(handler->event_name)) {
|
|
pj_str_t event;
|
|
|
|
pj_cstr(&event, handler->event_name);
|
|
|
|
if (!strcmp(handler->event_name, "message-summary")) {
|
|
pjsip_mwi_init_module(ast_sip_get_pjsip_endpoint(), pjsip_evsub_instance());
|
|
} else {
|
|
pjsip_evsub_register_pkg(&pubsub_module, &event, DEFAULT_EXPIRES, i, accept);
|
|
}
|
|
} else {
|
|
pjsip_endpt_add_capability(ast_sip_get_pjsip_endpoint(), &pubsub_module, PJSIP_H_ACCEPT, NULL,
|
|
i, accept);
|
|
}
|
|
|
|
sub_add_handler(handler);
|
|
return 0;
|
|
}
|
|
|
|
void ast_sip_unregister_subscription_handler(struct ast_sip_subscription_handler *handler)
|
|
{
|
|
struct ast_sip_subscription_handler *iter;
|
|
SCOPED_LOCK(lock, &subscription_handlers, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
|
|
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&subscription_handlers, iter, next) {
|
|
if (handler == iter) {
|
|
AST_RWLIST_REMOVE_CURRENT(next);
|
|
ast_module_unref(ast_module_info->self);
|
|
break;
|
|
}
|
|
}
|
|
AST_RWLIST_TRAVERSE_SAFE_END;
|
|
}
|
|
|
|
static struct ast_sip_subscription_handler *find_sub_handler(const char *event, char accept[AST_SIP_MAX_ACCEPT][64], size_t num_accept)
|
|
{
|
|
struct ast_sip_subscription_handler *iter;
|
|
int match = 0;
|
|
SCOPED_LOCK(lock, &subscription_handlers, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
|
|
AST_RWLIST_TRAVERSE(&subscription_handlers, iter, next) {
|
|
int i;
|
|
int j;
|
|
if (strcmp(event, iter->event_name)) {
|
|
ast_debug(3, "Event %s does not match %s\n", event, iter->event_name);
|
|
continue;
|
|
}
|
|
ast_debug(3, "Event name match: %s = %s\n", event, iter->event_name);
|
|
for (i = 0; i < num_accept; ++i) {
|
|
for (j = 0; j < num_accept; ++j) {
|
|
if (ast_strlen_zero(iter->accept[i])) {
|
|
ast_debug(3, "Breaking because subscription handler has run out of 'accept' types\n");
|
|
break;
|
|
}
|
|
if (!strcmp(accept[j], iter->accept[i])) {
|
|
ast_debug(3, "Accept headers match: %s = %s\n", accept[j], iter->accept[i]);
|
|
match = 1;
|
|
break;
|
|
}
|
|
ast_debug(3, "Accept %s does not match %s\n", accept[j], iter->accept[i]);
|
|
}
|
|
if (match) {
|
|
break;
|
|
}
|
|
}
|
|
if (match) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return iter;
|
|
}
|
|
|
|
static pj_bool_t pubsub_on_rx_subscribe_request(pjsip_rx_data *rdata)
|
|
{
|
|
char event[32];
|
|
char accept[AST_SIP_MAX_ACCEPT][64];
|
|
pjsip_accept_hdr *accept_header;
|
|
pjsip_event_hdr *event_header;
|
|
pjsip_expires_hdr *expires_header;
|
|
struct ast_sip_subscription_handler *handler;
|
|
RAII_VAR(struct ast_sip_endpoint *, endpoint, NULL, ao2_cleanup);
|
|
struct ast_sip_subscription *sub;
|
|
int i;
|
|
|
|
endpoint = ast_pjsip_rdata_get_endpoint(rdata);
|
|
ast_assert(endpoint != NULL);
|
|
|
|
if (!endpoint->allowsubscribe) {
|
|
ast_log(LOG_WARNING, "Subscriptions not permitted for endpoint %s.\n", ast_sorcery_object_get_id(endpoint));
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 603, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
expires_header = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_EXPIRES, rdata->msg_info.msg->hdr.next);
|
|
|
|
if (expires_header && expires_header->ivalue < endpoint->subminexpiry) {
|
|
ast_log(LOG_WARNING, "Subscription expiration %d is too brief for endpoint %s. Minimum is %d\n",
|
|
expires_header->ivalue, ast_sorcery_object_get_id(endpoint), endpoint->subminexpiry);
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 423, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
event_header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_event_name, rdata->msg_info.msg->hdr.next);
|
|
if (!event_header) {
|
|
ast_log(LOG_WARNING, "Incoming SUBSCRIBE request with no Event header\n");
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 489, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
accept_header = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_ACCEPT, rdata->msg_info.msg->hdr.next);
|
|
if (!accept_header) {
|
|
ast_log(LOG_WARNING, "Incoming SUBSCRIBE request with no Accept header\n");
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 400, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
ast_copy_pj_str(event, &event_header->event_type, sizeof(event));
|
|
for (i = 0; i < accept_header->count; ++i) {
|
|
ast_copy_pj_str(accept[i], &accept_header->values[i], sizeof(accept[i]));
|
|
}
|
|
|
|
handler = find_sub_handler(event, accept, accept_header->count);
|
|
if (!handler) {
|
|
ast_log(LOG_WARNING, "No registered subscribe handler for event %s\n", event);
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 489, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
sub = handler->new_subscribe(endpoint, rdata);
|
|
if (!sub) {
|
|
pjsip_transaction *trans = pjsip_rdata_get_tsx(rdata);
|
|
|
|
if (trans) {
|
|
pjsip_dialog *dlg = pjsip_rdata_get_dlg(rdata);
|
|
pjsip_tx_data *tdata;
|
|
|
|
if (pjsip_endpt_create_response(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, &tdata) != PJ_SUCCESS) {
|
|
return PJ_TRUE;
|
|
}
|
|
pjsip_dlg_send_response(dlg, trans, tdata);
|
|
} else {
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
|
|
}
|
|
}
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
static struct ast_sip_publish_handler *find_pub_handler(const char *event)
|
|
{
|
|
struct ast_sip_publish_handler *iter = NULL;
|
|
SCOPED_LOCK(lock, &publish_handlers, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
|
|
|
|
AST_RWLIST_TRAVERSE(&publish_handlers, iter, next) {
|
|
if (strcmp(event, iter->event_name)) {
|
|
ast_debug(3, "Event %s does not match %s\n", event, iter->event_name);
|
|
continue;
|
|
}
|
|
ast_debug(3, "Event name match: %s = %s\n", event, iter->event_name);
|
|
break;
|
|
}
|
|
|
|
return iter;
|
|
}
|
|
|
|
static enum sip_publish_type determine_sip_publish_type(pjsip_rx_data *rdata,
|
|
pjsip_generic_string_hdr *etag_hdr, int *expires, int *entity_id)
|
|
{
|
|
pjsip_expires_hdr *expires_hdr = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_EXPIRES, NULL);
|
|
|
|
if (etag_hdr) {
|
|
char etag[pj_strlen(&etag_hdr->hvalue) + 1];
|
|
|
|
ast_copy_pj_str(etag, &etag_hdr->hvalue, sizeof(etag));
|
|
|
|
if (sscanf(etag, "%30d", entity_id) != 1) {
|
|
return SIP_PUBLISH_UNKNOWN;
|
|
}
|
|
}
|
|
|
|
*expires = expires_hdr ? expires_hdr->ivalue : DEFAULT_PUBLISH_EXPIRES;
|
|
|
|
if (!(*expires)) {
|
|
return SIP_PUBLISH_REMOVE;
|
|
} else if (!etag_hdr && rdata->msg_info.msg->body) {
|
|
return SIP_PUBLISH_INITIAL;
|
|
} else if (etag_hdr && !rdata->msg_info.msg->body) {
|
|
return SIP_PUBLISH_REFRESH;
|
|
} else if (etag_hdr && rdata->msg_info.msg->body) {
|
|
return SIP_PUBLISH_MODIFY;
|
|
}
|
|
|
|
return SIP_PUBLISH_UNKNOWN;
|
|
}
|
|
|
|
static struct ast_sip_publication *publish_request_initial(struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata,
|
|
struct ast_sip_publish_handler *handler)
|
|
{
|
|
struct ast_sip_publication *publication = handler->new_publication(endpoint, rdata);
|
|
|
|
if (!publication) {
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 503, NULL, NULL, NULL);
|
|
return NULL;
|
|
}
|
|
|
|
publication->handler = handler;
|
|
|
|
return publication;
|
|
}
|
|
|
|
static int publish_expire_callback(void *data)
|
|
{
|
|
RAII_VAR(struct ast_sip_publication *, publication, data, ao2_cleanup);
|
|
|
|
publication->handler->publish_expire(publication);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int publish_expire(const void *data)
|
|
{
|
|
struct ast_sip_publication *publication = (struct ast_sip_publication*)data;
|
|
|
|
ao2_unlink(publication->handler->publications, publication);
|
|
publication->sched_id = -1;
|
|
|
|
if (ast_sip_push_task(NULL, publish_expire_callback, publication)) {
|
|
ao2_cleanup(publication);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static pj_bool_t pubsub_on_rx_publish_request(pjsip_rx_data *rdata)
|
|
{
|
|
pjsip_event_hdr *event_header;
|
|
struct ast_sip_publish_handler *handler;
|
|
RAII_VAR(struct ast_sip_endpoint *, endpoint, NULL, ao2_cleanup);
|
|
char event[32];
|
|
static const pj_str_t str_sip_if_match = { "SIP-If-Match", 12 };
|
|
pjsip_generic_string_hdr *etag_hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_sip_if_match, NULL);
|
|
enum sip_publish_type publish_type;
|
|
RAII_VAR(struct ast_sip_publication *, publication, NULL, ao2_cleanup);
|
|
int expires = 0, entity_id;
|
|
|
|
endpoint = ast_pjsip_rdata_get_endpoint(rdata);
|
|
ast_assert(endpoint != NULL);
|
|
|
|
event_header = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_event_name, rdata->msg_info.msg->hdr.next);
|
|
if (!event_header) {
|
|
ast_log(LOG_WARNING, "Incoming PUBLISH request with no Event header\n");
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 489, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
ast_copy_pj_str(event, &event_header->event_type, sizeof(event));
|
|
|
|
handler = find_pub_handler(event);
|
|
if (!handler) {
|
|
ast_log(LOG_WARNING, "No registered publish handler for event %s\n", event);
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 489, NULL, NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
publish_type = determine_sip_publish_type(rdata, etag_hdr, &expires, &entity_id);
|
|
|
|
/* If this is not an initial publish ensure that a publication is present */
|
|
if ((publish_type != SIP_PUBLISH_INITIAL) && (publish_type != SIP_PUBLISH_UNKNOWN)) {
|
|
if (!(publication = ao2_find(handler->publications, &entity_id, OBJ_KEY | OBJ_UNLINK))) {
|
|
static const pj_str_t str_conditional_request_failed = { "Conditional Request Failed", 26 };
|
|
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 412, &str_conditional_request_failed,
|
|
NULL, NULL);
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
/* Per the RFC every response has to have a new entity tag */
|
|
publication->entity_tag = ast_atomic_fetchadd_int(&esc_etag_counter, +1);
|
|
|
|
/* Update the expires here so that the created responses will contain the correct value */
|
|
publication->expires = expires;
|
|
}
|
|
|
|
switch (publish_type) {
|
|
case SIP_PUBLISH_INITIAL:
|
|
publication = publish_request_initial(endpoint, rdata, handler);
|
|
break;
|
|
case SIP_PUBLISH_REFRESH:
|
|
case SIP_PUBLISH_MODIFY:
|
|
if (handler->publish_refresh(publication, rdata)) {
|
|
/* If an error occurs we want to terminate the publication */
|
|
expires = 0;
|
|
}
|
|
break;
|
|
case SIP_PUBLISH_REMOVE:
|
|
handler->publish_termination(publication, rdata);
|
|
break;
|
|
case SIP_PUBLISH_UNKNOWN:
|
|
default:
|
|
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 400, NULL, NULL, NULL);
|
|
break;
|
|
}
|
|
|
|
if (publication) {
|
|
if (expires) {
|
|
ao2_link(handler->publications, publication);
|
|
|
|
AST_SCHED_REPLACE_UNREF(publication->sched_id, sched, expires * 1000, publish_expire, publication,
|
|
ao2_ref(publication, -1), ao2_ref(publication, -1), ao2_ref(publication, +1));
|
|
} else {
|
|
AST_SCHED_DEL_UNREF(sched, publication->sched_id, ao2_ref(publication, -1));
|
|
}
|
|
}
|
|
|
|
return PJ_TRUE;
|
|
}
|
|
|
|
/*! \brief Internal destructor for publications */
|
|
static void publication_destroy_fn(void *obj)
|
|
{
|
|
struct ast_sip_publication *publication = obj;
|
|
|
|
ast_debug(3, "Destroying SIP publication\n");
|
|
|
|
ao2_cleanup(publication->datastores);
|
|
ao2_cleanup(publication->endpoint);
|
|
}
|
|
|
|
struct ast_sip_publication *ast_sip_create_publication(struct ast_sip_endpoint *endpoint, pjsip_rx_data *rdata)
|
|
{
|
|
struct ast_sip_publication *publication;
|
|
pjsip_expires_hdr *expires_hdr = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_EXPIRES, NULL);
|
|
|
|
ast_assert(endpoint != NULL);
|
|
|
|
if (!(publication = ao2_alloc(sizeof(*publication), publication_destroy_fn))) {
|
|
return NULL;
|
|
}
|
|
|
|
if (!(publication->datastores = ao2_container_alloc(DATASTORE_BUCKETS, datastore_hash, datastore_cmp))) {
|
|
ao2_ref(publication, -1);
|
|
return NULL;
|
|
}
|
|
|
|
publication->entity_tag = ast_atomic_fetchadd_int(&esc_etag_counter, +1);
|
|
ao2_ref(endpoint, +1);
|
|
publication->endpoint = endpoint;
|
|
publication->expires = expires_hdr ? expires_hdr->ivalue : DEFAULT_PUBLISH_EXPIRES;
|
|
publication->sched_id = -1;
|
|
|
|
return publication;
|
|
}
|
|
|
|
struct ast_sip_endpoint *ast_sip_publication_get_endpoint(struct ast_sip_publication *pub)
|
|
{
|
|
return pub->endpoint;
|
|
}
|
|
|
|
int ast_sip_publication_create_response(struct ast_sip_publication *pub, int status_code, pjsip_rx_data *rdata,
|
|
pjsip_tx_data **tdata)
|
|
{
|
|
if (pjsip_endpt_create_response(ast_sip_get_pjsip_endpoint(), rdata, status_code, NULL, tdata) != PJ_SUCCESS) {
|
|
return -1;
|
|
}
|
|
|
|
if (PJSIP_IS_STATUS_IN_CLASS(status_code, 200)) {
|
|
RAII_VAR(char *, entity_tag, NULL, ast_free_ptr);
|
|
RAII_VAR(char *, expires, NULL, ast_free_ptr);
|
|
|
|
if ((ast_asprintf(&entity_tag, "%d", pub->entity_tag) < 0) ||
|
|
(ast_asprintf(&expires, "%d", pub->expires) < 0)) {
|
|
pjsip_tx_data_dec_ref(*tdata);
|
|
return -1;
|
|
}
|
|
|
|
ast_sip_add_header(*tdata, "SIP-ETag", entity_tag);
|
|
ast_sip_add_header(*tdata, "Expires", expires);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
pj_status_t ast_sip_publication_send_response(struct ast_sip_publication *pub, pjsip_rx_data *rdata,
|
|
pjsip_tx_data *tdata)
|
|
{
|
|
pj_status_t status;
|
|
pjsip_transaction *tsx;
|
|
|
|
if ((status = pjsip_tsx_create_uas(&pubsub_module, rdata, &tsx)) != PJ_SUCCESS) {
|
|
return status;
|
|
}
|
|
|
|
pjsip_tsx_recv_msg(tsx, rdata);
|
|
|
|
return pjsip_tsx_send_msg(tsx, tdata);
|
|
}
|
|
|
|
static pj_bool_t pubsub_on_rx_request(pjsip_rx_data *rdata)
|
|
{
|
|
if (!pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, pjsip_get_subscribe_method())) {
|
|
return pubsub_on_rx_subscribe_request(rdata);
|
|
} else if (!pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, &pjsip_publish_method)) {
|
|
return pubsub_on_rx_publish_request(rdata);
|
|
}
|
|
|
|
return PJ_FALSE;
|
|
}
|
|
|
|
static void pubsub_on_evsub_state(pjsip_evsub *evsub, pjsip_event *event)
|
|
{
|
|
struct ast_sip_subscription *sub;
|
|
if (pjsip_evsub_get_state(evsub) != PJSIP_EVSUB_STATE_TERMINATED) {
|
|
return;
|
|
}
|
|
|
|
sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
if (!sub) {
|
|
return;
|
|
}
|
|
|
|
if (event->type == PJSIP_EVENT_RX_MSG) {
|
|
sub->handler->subscription_terminated(sub, event->body.rx_msg.rdata);
|
|
}
|
|
|
|
if (event->type == PJSIP_EVENT_TSX_STATE &&
|
|
event->body.tsx_state.type == PJSIP_EVENT_RX_MSG) {
|
|
sub->handler->subscription_terminated(sub, event->body.tsx_state.src.rdata);
|
|
}
|
|
|
|
if (sub->handler->subscription_shutdown) {
|
|
sub->handler->subscription_shutdown(sub);
|
|
}
|
|
pjsip_evsub_set_mod_data(evsub, pubsub_module.id, NULL);
|
|
}
|
|
|
|
static void pubsub_on_tsx_state(pjsip_evsub *evsub, pjsip_transaction *tsx, pjsip_event *event)
|
|
{
|
|
struct ast_sip_subscription *sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
|
|
if (!sub) {
|
|
return;
|
|
}
|
|
|
|
if (sub->handler->notify_response && tsx->role == PJSIP_ROLE_UAC &&
|
|
event->body.tsx_state.type == PJSIP_EVENT_RX_MSG) {
|
|
sub->handler->notify_response(sub, event->body.tsx_state.src.rdata);
|
|
}
|
|
}
|
|
|
|
static void set_parameters_from_response_data(pj_pool_t *pool, int *p_st_code,
|
|
pj_str_t **p_st_text, pjsip_hdr *res_hdr, pjsip_msg_body **p_body,
|
|
struct ast_sip_subscription_response_data *response_data)
|
|
{
|
|
ast_assert(response_data->status_code >= 200 && response_data->status_code <= 699);
|
|
*p_st_code = response_data->status_code;
|
|
|
|
if (!ast_strlen_zero(response_data->status_text)) {
|
|
pj_strdup2(pool, *p_st_text, response_data->status_text);
|
|
}
|
|
|
|
if (response_data->headers) {
|
|
struct ast_variable *iter;
|
|
for (iter = response_data->headers; iter; iter = iter->next) {
|
|
pj_str_t header_name;
|
|
pj_str_t header_value;
|
|
pjsip_generic_string_hdr *hdr;
|
|
|
|
pj_cstr(&header_name, iter->name);
|
|
pj_cstr(&header_value, iter->value);
|
|
hdr = pjsip_generic_string_hdr_create(pool, &header_name, &header_value);
|
|
pj_list_insert_before(res_hdr, hdr);
|
|
}
|
|
}
|
|
|
|
if (response_data->body) {
|
|
pj_str_t type;
|
|
pj_str_t subtype;
|
|
pj_str_t body_text;
|
|
|
|
pj_cstr(&type, response_data->body->type);
|
|
pj_cstr(&subtype, response_data->body->subtype);
|
|
pj_cstr(&body_text, response_data->body->body_text);
|
|
|
|
*p_body = pjsip_msg_body_create(pool, &type, &subtype, &body_text);
|
|
}
|
|
}
|
|
|
|
static int response_data_changed(struct ast_sip_subscription_response_data *response_data)
|
|
{
|
|
if (response_data->status_code != 200 ||
|
|
!ast_strlen_zero(response_data->status_text) ||
|
|
response_data->headers ||
|
|
response_data->body) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void pubsub_on_rx_refresh(pjsip_evsub *evsub, pjsip_rx_data *rdata,
|
|
int *p_st_code, pj_str_t **p_st_text, pjsip_hdr *res_hdr, pjsip_msg_body **p_body)
|
|
{
|
|
struct ast_sip_subscription *sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
struct ast_sip_subscription_response_data response_data = {
|
|
.status_code = 200,
|
|
};
|
|
|
|
if (!sub) {
|
|
return;
|
|
}
|
|
|
|
sub->handler->resubscribe(sub, rdata, &response_data);
|
|
|
|
if (!response_data_changed(&response_data)) {
|
|
return;
|
|
}
|
|
|
|
set_parameters_from_response_data(rdata->tp_info.pool, p_st_code, p_st_text,
|
|
res_hdr, p_body, &response_data);
|
|
}
|
|
|
|
static void pubsub_on_rx_notify(pjsip_evsub *evsub, pjsip_rx_data *rdata, int *p_st_code,
|
|
pj_str_t **p_st_text, pjsip_hdr *res_hdr, pjsip_msg_body **p_body)
|
|
{
|
|
struct ast_sip_subscription *sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
struct ast_sip_subscription_response_data response_data = {
|
|
.status_code = 200,
|
|
};
|
|
|
|
if (!sub || !sub->handler->notify_request) {
|
|
return;
|
|
}
|
|
|
|
sub->handler->notify_request(sub, rdata, &response_data);
|
|
|
|
if (!response_data_changed(&response_data)) {
|
|
return;
|
|
}
|
|
|
|
set_parameters_from_response_data(rdata->tp_info.pool, p_st_code, p_st_text,
|
|
res_hdr, p_body, &response_data);
|
|
}
|
|
|
|
static int serialized_pubsub_on_client_refresh(void *userdata)
|
|
{
|
|
struct ast_sip_subscription *sub = userdata;
|
|
|
|
sub->handler->refresh_subscription(sub);
|
|
ao2_cleanup(sub);
|
|
return 0;
|
|
}
|
|
|
|
static void pubsub_on_client_refresh(pjsip_evsub *evsub)
|
|
{
|
|
struct ast_sip_subscription *sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
|
|
ao2_ref(sub, +1);
|
|
ast_sip_push_task(sub->serializer, serialized_pubsub_on_client_refresh, sub);
|
|
}
|
|
|
|
static int serialized_pubsub_on_server_timeout(void *userdata)
|
|
{
|
|
struct ast_sip_subscription *sub = userdata;
|
|
|
|
sub->handler->subscription_timeout(sub);
|
|
ao2_cleanup(sub);
|
|
return 0;
|
|
}
|
|
|
|
static void pubsub_on_server_timeout(pjsip_evsub *evsub)
|
|
{
|
|
struct ast_sip_subscription *sub = pjsip_evsub_get_mod_data(evsub, pubsub_module.id);
|
|
|
|
ao2_ref(sub, +1);
|
|
ast_sip_push_task(sub->serializer, serialized_pubsub_on_server_timeout, sub);
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
static const pj_str_t str_PUBLISH = { "PUBLISH", 7 };
|
|
|
|
pjsip_evsub_init_module(ast_sip_get_pjsip_endpoint());
|
|
|
|
if (!(sched = ast_sched_context_create())) {
|
|
ast_log(LOG_ERROR, "Could not create scheduler for publication expiration\n");
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
|
|
if (ast_sched_start_thread(sched)) {
|
|
ast_log(LOG_ERROR, "Could not start scheduler thread for publication expiration\n");
|
|
ast_sched_context_destroy(sched);
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
|
|
pjsip_endpt_add_capability(ast_sip_get_pjsip_endpoint(), NULL, PJSIP_H_ALLOW, NULL, 1, &str_PUBLISH);
|
|
|
|
if (ast_sip_register_service(&pubsub_module)) {
|
|
ast_log(LOG_ERROR, "Could not register pubsub service\n");
|
|
ast_sched_context_destroy(sched);
|
|
return AST_MODULE_LOAD_FAILURE;
|
|
}
|
|
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
if (sched) {
|
|
ast_sched_context_destroy(sched);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "SIP event resource",
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_CHANNEL_DEPEND,
|
|
);
|