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asterisk/res/res_pjsip_session.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2013, Digium, Inc.
*
* Mark Michelson <mmichelson@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*** MODULEINFO
<depend>pjproject</depend>
<depend>res_pjsip</depend>
<support_level>core</support_level>
***/
#include "asterisk.h"
#include <pjsip.h>
#include <pjsip_ua.h>
#include <pjlib.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "asterisk/callerid.h"
#include "asterisk/datastore.h"
#include "asterisk/module.h"
#include "asterisk/logger.h"
#include "asterisk/res_pjsip.h"
#include "asterisk/astobj2.h"
#include "asterisk/lock.h"
#include "asterisk/uuid.h"
#include "asterisk/pbx.h"
#include "asterisk/taskprocessor.h"
#include "asterisk/causes.h"
#include "asterisk/sdp_srtp.h"
#include "asterisk/dsp.h"
#include "asterisk/acl.h"
#include "asterisk/features_config.h"
#include "asterisk/pickup.h"
#include "asterisk/test.h"
#define SDP_HANDLER_BUCKETS 11
#define MOD_DATA_ON_RESPONSE "on_response"
#define MOD_DATA_NAT_HOOK "nat_hook"
/* Some forward declarations */
static void handle_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata);
static void handle_incoming_response(struct ast_sip_session *session, pjsip_rx_data *rdata,
enum ast_sip_session_response_priority response_priority);
static int handle_incoming(struct ast_sip_session *session, pjsip_rx_data *rdata,
enum ast_sip_session_response_priority response_priority);
static void handle_outgoing_request(struct ast_sip_session *session, pjsip_tx_data *tdata);
static void handle_outgoing_response(struct ast_sip_session *session, pjsip_tx_data *tdata);
/*! \brief NAT hook for modifying outgoing messages with SDP */
static struct ast_sip_nat_hook *nat_hook;
/*!
* \brief Registered SDP stream handlers
*
* This container is keyed on stream types. Each
* object in the container is a linked list of
* handlers for the stream type.
*/
static struct ao2_container *sdp_handlers;
/*!
* These are the objects in the sdp_handlers container
*/
struct sdp_handler_list {
/* The list of handlers to visit */
AST_LIST_HEAD_NOLOCK(, ast_sip_session_sdp_handler) list;
/* The handlers in this list handle streams of this type */
char stream_type[1];
};
static struct pjmedia_sdp_session *create_local_sdp(pjsip_inv_session *inv, struct ast_sip_session *session, const pjmedia_sdp_session *offer);
static int sdp_handler_list_hash(const void *obj, int flags)
{
const struct sdp_handler_list *handler_list = obj;
const char *stream_type = flags & OBJ_KEY ? obj : handler_list->stream_type;
return ast_str_hash(stream_type);
}
static int sdp_handler_list_cmp(void *obj, void *arg, int flags)
{
struct sdp_handler_list *handler_list1 = obj;
struct sdp_handler_list *handler_list2 = arg;
const char *stream_type2 = flags & OBJ_KEY ? arg : handler_list2->stream_type;
return strcmp(handler_list1->stream_type, stream_type2) ? 0 : CMP_MATCH | CMP_STOP;
}
static int session_media_hash(const void *obj, int flags)
{
const struct ast_sip_session_media *session_media = obj;
const char *stream_type = flags & OBJ_KEY ? obj : session_media->stream_type;
return ast_str_hash(stream_type);
}
static int session_media_cmp(void *obj, void *arg, int flags)
{
struct ast_sip_session_media *session_media1 = obj;
struct ast_sip_session_media *session_media2 = arg;
const char *stream_type2 = flags & OBJ_KEY ? arg : session_media2->stream_type;
return strcmp(session_media1->stream_type, stream_type2) ? 0 : CMP_MATCH | CMP_STOP;
}
int ast_sip_session_register_sdp_handler(struct ast_sip_session_sdp_handler *handler, const char *stream_type)
{
RAII_VAR(struct sdp_handler_list *, handler_list,
ao2_find(sdp_handlers, stream_type, OBJ_KEY), ao2_cleanup);
SCOPED_AO2LOCK(lock, sdp_handlers);
if (handler_list) {
struct ast_sip_session_sdp_handler *iter;
/* Check if this handler is already registered for this stream type */
AST_LIST_TRAVERSE(&handler_list->list, iter, next) {
if (!strcmp(iter->id, handler->id)) {
ast_log(LOG_WARNING, "Handler '%s' already registered for stream type '%s'.\n", handler->id, stream_type);
return -1;
}
}
AST_LIST_INSERT_TAIL(&handler_list->list, handler, next);
ast_debug(1, "Registered SDP stream handler '%s' for stream type '%s'\n", handler->id, stream_type);
ast_module_ref(ast_module_info->self);
return 0;
}
/* No stream of this type has been registered yet, so we need to create a new list */
handler_list = ao2_alloc(sizeof(*handler_list) + strlen(stream_type), NULL);
if (!handler_list) {
return -1;
}
/* Safe use of strcpy */
strcpy(handler_list->stream_type, stream_type);
AST_LIST_HEAD_INIT_NOLOCK(&handler_list->list);
AST_LIST_INSERT_TAIL(&handler_list->list, handler, next);
if (!ao2_link(sdp_handlers, handler_list)) {
return -1;
}
ast_debug(1, "Registered SDP stream handler '%s' for stream type '%s'\n", handler->id, stream_type);
ast_module_ref(ast_module_info->self);
return 0;
}
static int remove_handler(void *obj, void *arg, void *data, int flags)
{
struct sdp_handler_list *handler_list = obj;
struct ast_sip_session_sdp_handler *handler = data;
struct ast_sip_session_sdp_handler *iter;
const char *stream_type = arg;
AST_LIST_TRAVERSE_SAFE_BEGIN(&handler_list->list, iter, next) {
if (!strcmp(iter->id, handler->id)) {
AST_LIST_REMOVE_CURRENT(next);
ast_debug(1, "Unregistered SDP stream handler '%s' for stream type '%s'\n", handler->id, stream_type);
ast_module_unref(ast_module_info->self);
}
}
AST_LIST_TRAVERSE_SAFE_END;
if (AST_LIST_EMPTY(&handler_list->list)) {
ast_debug(3, "No more handlers exist for stream type '%s'\n", stream_type);
return CMP_MATCH;
} else {
return CMP_STOP;
}
}
void ast_sip_session_unregister_sdp_handler(struct ast_sip_session_sdp_handler *handler, const char *stream_type)
{
ao2_callback_data(sdp_handlers, OBJ_KEY | OBJ_UNLINK | OBJ_NODATA, remove_handler, (void *)stream_type, handler);
}
/*!
* \brief Set an SDP stream handler for a corresponding session media.
*
* \note Always use this function to set the SDP handler for a session media.
*
* This function will properly free resources on the SDP handler currently being
* used by the session media, then set the session media to use the new SDP
* handler.
*/
static void session_media_set_handler(struct ast_sip_session_media *session_media,
struct ast_sip_session_sdp_handler *handler)
{
ast_assert(session_media->handler != handler);
if (session_media->handler) {
session_media->handler->stream_destroy(session_media);
}
session_media->handler = handler;
}
static int handle_incoming_sdp(struct ast_sip_session *session, const pjmedia_sdp_session *sdp)
{
int i;
int handled = 0;
if (session->inv_session && session->inv_session->state == PJSIP_INV_STATE_DISCONNECTED) {
ast_log(LOG_ERROR, "Failed to handle incoming SDP. Session has been already disconnected\n");
return -1;
}
for (i = 0; i < sdp->media_count; ++i) {
/* See if there are registered handlers for this media stream type */
char media[20];
struct ast_sip_session_sdp_handler *handler;
RAII_VAR(struct sdp_handler_list *, handler_list, NULL, ao2_cleanup);
RAII_VAR(struct ast_sip_session_media *, session_media, NULL, ao2_cleanup);
int res;
/* We need a null-terminated version of the media string */
ast_copy_pj_str(media, &sdp->media[i]->desc.media, sizeof(media));
session_media = ao2_find(session->media, media, OBJ_KEY);
if (!session_media) {
/* if the session_media doesn't exist, there weren't
* any handlers at the time of its creation */
continue;
}
if (session_media->handler) {
handler = session_media->handler;
ast_debug(1, "Negotiating incoming SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
session_media->handler->id);
res = handler->negotiate_incoming_sdp_stream(session, session_media, sdp,
sdp->media[i]);
if (res < 0) {
/* Catastrophic failure. Abort! */
return -1;
} else if (res > 0) {
ast_debug(1, "Media stream '%s' handled by %s\n",
session_media->stream_type,
session_media->handler->id);
/* Handled by this handler. Move to the next stream */
handled = 1;
continue;
}
}
handler_list = ao2_find(sdp_handlers, media, OBJ_KEY);
if (!handler_list) {
ast_debug(1, "No registered SDP handlers for media type '%s'\n", media);
continue;
}
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
if (handler == session_media->handler) {
continue;
}
ast_debug(1, "Negotiating incoming SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
handler->id);
res = handler->negotiate_incoming_sdp_stream(session, session_media, sdp,
sdp->media[i]);
if (res < 0) {
/* Catastrophic failure. Abort! */
return -1;
}
if (res > 0) {
ast_debug(1, "Media stream '%s' handled by %s\n",
session_media->stream_type,
handler->id);
/* Handled by this handler. Move to the next stream */
session_media_set_handler(session_media, handler);
handled = 1;
break;
}
}
}
if (!handled) {
return -1;
}
return 0;
}
struct handle_negotiated_sdp_cb {
struct ast_sip_session *session;
const pjmedia_sdp_session *local;
const pjmedia_sdp_session *remote;
};
static int handle_negotiated_sdp_session_media(void *obj, void *arg, int flags)
{
struct ast_sip_session_media *session_media = obj;
struct handle_negotiated_sdp_cb *callback_data = arg;
struct ast_sip_session *session = callback_data->session;
const pjmedia_sdp_session *local = callback_data->local;
const pjmedia_sdp_session *remote = callback_data->remote;
int i;
for (i = 0; i < local->media_count; ++i) {
/* See if there are registered handlers for this media stream type */
char media[20];
struct ast_sip_session_sdp_handler *handler;
RAII_VAR(struct sdp_handler_list *, handler_list, NULL, ao2_cleanup);
int res;
if (!remote->media[i]) {
continue;
}
/* We need a null-terminated version of the media string */
ast_copy_pj_str(media, &local->media[i]->desc.media, sizeof(media));
/* stream type doesn't match the one we're looking to fill */
if (strcasecmp(session_media->stream_type, media)) {
continue;
}
handler = session_media->handler;
if (handler) {
ast_debug(1, "Applying negotiated SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
handler->id);
res = handler->apply_negotiated_sdp_stream(session, session_media, local,
local->media[i], remote, remote->media[i]);
if (res >= 0) {
ast_debug(1, "Applied negotiated SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
handler->id);
return CMP_MATCH;
}
return 0;
}
handler_list = ao2_find(sdp_handlers, media, OBJ_KEY);
if (!handler_list) {
ast_debug(1, "No registered SDP handlers for media type '%s'\n", media);
continue;
}
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
if (handler == session_media->handler) {
continue;
}
ast_debug(1, "Applying negotiated SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
handler->id);
res = handler->apply_negotiated_sdp_stream(session, session_media, local,
local->media[i], remote, remote->media[i]);
if (res < 0) {
/* Catastrophic failure. Abort! */
return 0;
}
if (res > 0) {
ast_debug(1, "Applied negotiated SDP media stream '%s' using %s SDP handler\n",
session_media->stream_type,
handler->id);
/* Handled by this handler. Move to the next stream */
session_media_set_handler(session_media, handler);
return CMP_MATCH;
}
}
}
if (session_media->handler && session_media->handler->stream_stop) {
ast_debug(1, "Stopping SDP media stream '%s' as it is not currently negotiated\n",
session_media->stream_type);
session_media->handler->stream_stop(session_media);
}
return CMP_MATCH;
}
static int handle_negotiated_sdp(struct ast_sip_session *session, const pjmedia_sdp_session *local, const pjmedia_sdp_session *remote)
{
RAII_VAR(struct ao2_iterator *, successful, NULL, ao2_iterator_cleanup);
struct handle_negotiated_sdp_cb callback_data = {
.session = session,
.local = local,
.remote = remote,
};
successful = ao2_callback(session->media, OBJ_MULTIPLE, handle_negotiated_sdp_session_media, &callback_data);
if (successful && ao2_iterator_count(successful) == ao2_container_count(session->media)) {
/* Nothing experienced a catastrophic failure */
ast_queue_frame(session->channel, &ast_null_frame);
return 0;
}
return -1;
}
AST_RWLIST_HEAD_STATIC(session_supplements, ast_sip_session_supplement);
int ast_sip_session_register_supplement(struct ast_sip_session_supplement *supplement)
{
struct ast_sip_session_supplement *iter;
int inserted = 0;
SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
if (!supplement->response_priority) {
supplement->response_priority = AST_SIP_SESSION_BEFORE_MEDIA;
}
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
if (iter->priority > supplement->priority) {
AST_RWLIST_INSERT_BEFORE_CURRENT(supplement, next);
inserted = 1;
break;
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
if (!inserted) {
AST_RWLIST_INSERT_TAIL(&session_supplements, supplement, next);
}
ast_module_ref(ast_module_info->self);
return 0;
}
void ast_sip_session_unregister_supplement(struct ast_sip_session_supplement *supplement)
{
struct ast_sip_session_supplement *iter;
SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
if (supplement == iter) {
AST_RWLIST_REMOVE_CURRENT(next);
ast_module_unref(ast_module_info->self);
break;
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
}
static struct ast_sip_session_supplement *supplement_dup(const struct ast_sip_session_supplement *src)
{
struct ast_sip_session_supplement *dst = ast_calloc(1, sizeof(*dst));
if (!dst) {
return NULL;
}
/* Will need to revisit if shallow copy becomes an issue */
*dst = *src;
return dst;
}
#define DATASTORE_BUCKETS 53
#define MEDIA_BUCKETS 7
static void session_datastore_destroy(void *obj)
{
struct ast_datastore *datastore = obj;
/* Using the destroy function (if present) destroy the data */
if (datastore->info->destroy != NULL && datastore->data != NULL) {
datastore->info->destroy(datastore->data);
datastore->data = NULL;
}
ast_free((void *) datastore->uid);
datastore->uid = NULL;
}
struct ast_datastore *ast_sip_session_alloc_datastore(const struct ast_datastore_info *info, const char *uid)
{
RAII_VAR(struct ast_datastore *, datastore, NULL, ao2_cleanup);
char uuid_buf[AST_UUID_STR_LEN];
const char *uid_ptr = uid;
if (!info) {
return NULL;
}
datastore = ao2_alloc(sizeof(*datastore), session_datastore_destroy);
if (!datastore) {
return NULL;
}
datastore->info = info;
if (ast_strlen_zero(uid)) {
/* They didn't provide an ID so we'll provide one ourself */
uid_ptr = ast_uuid_generate_str(uuid_buf, sizeof(uuid_buf));
}
datastore->uid = ast_strdup(uid_ptr);
if (!datastore->uid) {
return NULL;
}
ao2_ref(datastore, +1);
return datastore;
}
int ast_sip_session_add_datastore(struct ast_sip_session *session, struct ast_datastore *datastore)
{
ast_assert(datastore != NULL);
ast_assert(datastore->info != NULL);
ast_assert(ast_strlen_zero(datastore->uid) == 0);
if (!ao2_link(session->datastores, datastore)) {
return -1;
}
return 0;
}
struct ast_datastore *ast_sip_session_get_datastore(struct ast_sip_session *session, const char *name)
{
return ao2_find(session->datastores, name, OBJ_KEY);
}
void ast_sip_session_remove_datastore(struct ast_sip_session *session, const char *name)
{
ao2_callback(session->datastores, OBJ_KEY | OBJ_UNLINK | OBJ_NODATA, NULL, (void *) name);
}
enum delayed_method {
DELAYED_METHOD_INVITE,
DELAYED_METHOD_UPDATE,
DELAYED_METHOD_BYE,
};
/*!
* \internal
* \brief Convert delayed method enum value to to a string.
* \since 13.3.0
*
* \param method Delayed method enum value to convert to a string.
*
* \return String value of delayed method.
*/
static const char *delayed_method2str(enum delayed_method method)
{
const char *str = "<unknown>";
switch (method) {
case DELAYED_METHOD_INVITE:
str = "INVITE";
break;
case DELAYED_METHOD_UPDATE:
str = "UPDATE";
break;
case DELAYED_METHOD_BYE:
str = "BYE";
break;
}
return str;
}
/*!
* \brief Structure used for sending delayed requests
*
* Requests are typically delayed because the current transaction
* state of an INVITE. Once the pending INVITE transaction terminates,
* the delayed request will be sent
*/
struct ast_sip_session_delayed_request {
/*! Method of the request */
enum delayed_method method;
/*! Callback to call when the delayed request is created. */
ast_sip_session_request_creation_cb on_request_creation;
/*! Callback to call when the delayed request SDP is created */
ast_sip_session_sdp_creation_cb on_sdp_creation;
/*! Callback to call when the delayed request receives a response */
ast_sip_session_response_cb on_response;
/*! Whether to generate new SDP */
int generate_new_sdp;
AST_LIST_ENTRY(ast_sip_session_delayed_request) next;
};
static struct ast_sip_session_delayed_request *delayed_request_alloc(
enum delayed_method method,
ast_sip_session_request_creation_cb on_request_creation,
ast_sip_session_sdp_creation_cb on_sdp_creation,
ast_sip_session_response_cb on_response,
int generate_new_sdp)
{
struct ast_sip_session_delayed_request *delay = ast_calloc(1, sizeof(*delay));
if (!delay) {
return NULL;
}
delay->method = method;
delay->on_request_creation = on_request_creation;
delay->on_sdp_creation = on_sdp_creation;
delay->on_response = on_response;
delay->generate_new_sdp = generate_new_sdp;
return delay;
}
static int send_delayed_request(struct ast_sip_session *session, struct ast_sip_session_delayed_request *delay)
{
ast_debug(3, "Endpoint '%s(%s)' sending delayed %s request.\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
delayed_method2str(delay->method));
switch (delay->method) {
case DELAYED_METHOD_INVITE:
ast_sip_session_refresh(session, delay->on_request_creation,
delay->on_sdp_creation, delay->on_response,
AST_SIP_SESSION_REFRESH_METHOD_INVITE, delay->generate_new_sdp);
return 0;
case DELAYED_METHOD_UPDATE:
ast_sip_session_refresh(session, delay->on_request_creation,
delay->on_sdp_creation, delay->on_response,
AST_SIP_SESSION_REFRESH_METHOD_UPDATE, delay->generate_new_sdp);
return 0;
case DELAYED_METHOD_BYE:
ast_sip_session_terminate(session, 0);
return 0;
}
ast_log(LOG_WARNING, "Don't know how to send delayed %s(%d) request.\n",
delayed_method2str(delay->method), delay->method);
return -1;
}
/*!
* \internal
* \brief The current INVITE transaction is in the PROCEEDING state.
* \since 13.3.0
*
* \param vsession Session object.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int invite_proceeding(void *vsession)
{
struct ast_sip_session *session = vsession;
struct ast_sip_session_delayed_request *delay;
int found = 0;
int res = 0;
AST_LIST_TRAVERSE_SAFE_BEGIN(&session->delayed_requests, delay, next) {
switch (delay->method) {
case DELAYED_METHOD_INVITE:
break;
case DELAYED_METHOD_UPDATE:
AST_LIST_REMOVE_CURRENT(next);
res = send_delayed_request(session, delay);
ast_free(delay);
found = 1;
break;
case DELAYED_METHOD_BYE:
/* A BYE is pending so don't bother anymore. */
found = 1;
break;
}
if (found) {
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
ao2_ref(session, -1);
return res;
}
/*!
* \internal
* \brief The current INVITE transaction is in the TERMINATED state.
* \since 13.3.0
*
* \param vsession Session object.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int invite_terminated(void *vsession)
{
struct ast_sip_session *session = vsession;
struct ast_sip_session_delayed_request *delay;
int found = 0;
int res = 0;
int timer_running;
/* re-INVITE collision timer running? */
timer_running = pj_timer_entry_running(&session->rescheduled_reinvite);
AST_LIST_TRAVERSE_SAFE_BEGIN(&session->delayed_requests, delay, next) {
switch (delay->method) {
case DELAYED_METHOD_INVITE:
if (!timer_running) {
found = 1;
}
break;
case DELAYED_METHOD_UPDATE:
case DELAYED_METHOD_BYE:
found = 1;
break;
}
if (found) {
AST_LIST_REMOVE_CURRENT(next);
res = send_delayed_request(session, delay);
ast_free(delay);
break;
}
}
AST_LIST_TRAVERSE_SAFE_END;
ao2_ref(session, -1);
return res;
}
/*!
* \internal
* \brief INVITE collision timeout.
* \since 13.3.0
*
* \param vsession Session object.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int invite_collision_timeout(void *vsession)
{
struct ast_sip_session *session = vsession;
int res;
if (session->inv_session->invite_tsx) {
/*
* INVITE transaction still active. Let it send
* the collision re-INVITE when it terminates.
*/
ao2_ref(session, -1);
res = 0;
} else {
res = invite_terminated(session);
}
return res;
}
/*!
* \internal
* \brief The current UPDATE transaction is in the COMPLETED state.
* \since 13.3.0
*
* \param vsession Session object.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int update_completed(void *vsession)
{
struct ast_sip_session *session = vsession;
int res;
if (session->inv_session->invite_tsx) {
res = invite_proceeding(session);
} else {
res = invite_terminated(session);
}
return res;
}
static void check_delayed_requests(struct ast_sip_session *session,
int (*cb)(void *vsession))
{
ao2_ref(session, +1);
if (ast_sip_push_task(session->serializer, cb, session)) {
ao2_ref(session, -1);
}
}
static int delay_request(struct ast_sip_session *session,
ast_sip_session_request_creation_cb on_request,
ast_sip_session_sdp_creation_cb on_sdp_creation,
ast_sip_session_response_cb on_response,
int generate_new_sdp,
enum delayed_method method)
{
struct ast_sip_session_delayed_request *delay = delayed_request_alloc(method,
on_request, on_sdp_creation, on_response, generate_new_sdp);
if (!delay) {
return -1;
}
if (method == DELAYED_METHOD_BYE) {
/* Send BYE as early as possible */
AST_LIST_INSERT_HEAD(&session->delayed_requests, delay, next);
} else {
AST_LIST_INSERT_TAIL(&session->delayed_requests, delay, next);
}
return 0;
}
static pjmedia_sdp_session *generate_session_refresh_sdp(struct ast_sip_session *session)
{
pjsip_inv_session *inv_session = session->inv_session;
const pjmedia_sdp_session *previous_sdp = NULL;
if (inv_session->neg) {
if (pjmedia_sdp_neg_was_answer_remote(inv_session->neg)) {
pjmedia_sdp_neg_get_active_remote(inv_session->neg, &previous_sdp);
} else {
pjmedia_sdp_neg_get_active_local(inv_session->neg, &previous_sdp);
}
}
return create_local_sdp(inv_session, session, previous_sdp);
}
static void set_from_header(struct ast_sip_session *session)
{
struct ast_party_id effective_id;
struct ast_party_id connected_id;
pj_pool_t *dlg_pool;
pjsip_fromto_hdr *dlg_info;
pjsip_name_addr *dlg_info_name_addr;
pjsip_sip_uri *dlg_info_uri;
int restricted;
if (!session->channel || session->saved_from_hdr) {
return;
}
/* We need to save off connected_id for RPID/PAI generation */
ast_party_id_init(&connected_id);
ast_channel_lock(session->channel);
effective_id = ast_channel_connected_effective_id(session->channel);
ast_party_id_copy(&connected_id, &effective_id);
ast_channel_unlock(session->channel);
restricted =
((ast_party_id_presentation(&connected_id) & AST_PRES_RESTRICTION) != AST_PRES_ALLOWED);
/* Now set up dlg->local.info so pjsip can correctly generate From */
dlg_pool = session->inv_session->dlg->pool;
dlg_info = session->inv_session->dlg->local.info;
dlg_info_name_addr = (pjsip_name_addr *) dlg_info->uri;
dlg_info_uri = pjsip_uri_get_uri(dlg_info_name_addr);
if (session->endpoint->id.trust_outbound || !restricted) {
ast_sip_modify_id_header(dlg_pool, dlg_info, &connected_id);
}
ast_party_id_free(&connected_id);
if (!ast_strlen_zero(session->endpoint->fromuser)) {
dlg_info_name_addr->display.ptr = NULL;
dlg_info_name_addr->display.slen = 0;
pj_strdup2(dlg_pool, &dlg_info_uri->user, session->endpoint->fromuser);
}
if (!ast_strlen_zero(session->endpoint->fromdomain)) {
pj_strdup2(dlg_pool, &dlg_info_uri->host, session->endpoint->fromdomain);
}
ast_sip_add_usereqphone(session->endpoint, dlg_pool, dlg_info->uri);
/* We need to save off the non-anonymized From for RPID/PAI generation (for domain) */
session->saved_from_hdr = pjsip_hdr_clone(dlg_pool, dlg_info);
/* In chan_sip, fromuser and fromdomain trump restricted so we only
* anonymize if they're not set.
*/
if (restricted) {
/* fromuser doesn't provide a display name so we always set it */
pj_strdup2(dlg_pool, &dlg_info_name_addr->display, "Anonymous");
if (ast_strlen_zero(session->endpoint->fromuser)) {
pj_strdup2(dlg_pool, &dlg_info_uri->user, "anonymous");
}
if (ast_strlen_zero(session->endpoint->fromdomain)) {
pj_strdup2(dlg_pool, &dlg_info_uri->host, "anonymous.invalid");
}
}
}
int ast_sip_session_refresh(struct ast_sip_session *session,
ast_sip_session_request_creation_cb on_request_creation,
ast_sip_session_sdp_creation_cb on_sdp_creation,
ast_sip_session_response_cb on_response,
enum ast_sip_session_refresh_method method, int generate_new_sdp)
{
pjsip_inv_session *inv_session = session->inv_session;
pjmedia_sdp_session *new_sdp = NULL;
pjsip_tx_data *tdata;
if (inv_session->state == PJSIP_INV_STATE_DISCONNECTED) {
/* Don't try to do anything with a hung-up call */
ast_debug(3, "Not sending reinvite to %s because of disconnected state...\n",
ast_sorcery_object_get_id(session->endpoint));
return 0;
}
/* If the dialog has not yet been established we have to defer until it has */
if (inv_session->dlg->state != PJSIP_DIALOG_STATE_ESTABLISHED) {
ast_debug(3, "Delay sending request to %s because dialog has not been established...\n",
ast_sorcery_object_get_id(session->endpoint));
return delay_request(session, on_request_creation, on_sdp_creation, on_response,
generate_new_sdp,
method == AST_SIP_SESSION_REFRESH_METHOD_INVITE
? DELAYED_METHOD_INVITE : DELAYED_METHOD_UPDATE);
}
if (method == AST_SIP_SESSION_REFRESH_METHOD_INVITE) {
if (inv_session->invite_tsx) {
/* We can't send a reinvite yet, so delay it */
ast_debug(3, "Delay sending reinvite to %s because of outstanding transaction...\n",
ast_sorcery_object_get_id(session->endpoint));
return delay_request(session, on_request_creation, on_sdp_creation,
on_response, generate_new_sdp, DELAYED_METHOD_INVITE);
} else if (inv_session->state != PJSIP_INV_STATE_CONFIRMED) {
/* Initial INVITE transaction failed to progress us to a confirmed state
* which means re-invites are not possible
*/
ast_debug(3, "Not sending reinvite to %s because not in confirmed state...\n",
ast_sorcery_object_get_id(session->endpoint));
return 0;
}
}
if (generate_new_sdp) {
/* SDP can only be generated if current negotiation has already completed */
if (inv_session->neg
&& pjmedia_sdp_neg_get_state(inv_session->neg)
!= PJMEDIA_SDP_NEG_STATE_DONE) {
ast_debug(3, "Delay session refresh with new SDP to %s because SDP negotiation is not yet done...\n",
ast_sorcery_object_get_id(session->endpoint));
return delay_request(session, on_request_creation, on_sdp_creation,
on_response, generate_new_sdp,
method == AST_SIP_SESSION_REFRESH_METHOD_INVITE
? DELAYED_METHOD_INVITE : DELAYED_METHOD_UPDATE);
}
new_sdp = generate_session_refresh_sdp(session);
if (!new_sdp) {
ast_log(LOG_ERROR, "Failed to generate session refresh SDP. Not sending session refresh\n");
return -1;
}
if (on_sdp_creation) {
if (on_sdp_creation(session, new_sdp)) {
return -1;
}
}
}
/*
* We MUST call set_from_header() before pjsip_inv_(reinvite|update). If we don't, the
* From in the reINVITE/UPDATE will be wrong but the rest of the messages will be OK.
*/
set_from_header(session);
if (method == AST_SIP_SESSION_REFRESH_METHOD_INVITE) {
if (pjsip_inv_reinvite(inv_session, NULL, new_sdp, &tdata)) {
ast_log(LOG_WARNING, "Failed to create reinvite properly.\n");
return -1;
}
} else if (pjsip_inv_update(inv_session, NULL, new_sdp, &tdata)) {
ast_log(LOG_WARNING, "Failed to create UPDATE properly.\n");
return -1;
}
if (on_request_creation) {
if (on_request_creation(session, tdata)) {
return -1;
}
}
ast_debug(3, "Sending session refresh SDP via %s to %s\n",
method == AST_SIP_SESSION_REFRESH_METHOD_INVITE ? "re-INVITE" : "UPDATE",
ast_sorcery_object_get_id(session->endpoint));
ast_sip_session_send_request_with_cb(session, tdata, on_response);
return 0;
}
void ast_sip_session_send_response(struct ast_sip_session *session, pjsip_tx_data *tdata)
{
handle_outgoing_response(session, tdata);
pjsip_inv_send_msg(session->inv_session, tdata);
return;
}
static pj_bool_t session_on_rx_request(pjsip_rx_data *rdata);
static pjsip_module session_module = {
.name = {"Session Module", 14},
.priority = PJSIP_MOD_PRIORITY_APPLICATION,
.on_rx_request = session_on_rx_request,
};
/*! \brief Determine whether the SDP provided requires deferral of negotiating or not
*
* \retval 1 re-invite should be deferred and resumed later
* \retval 0 re-invite should not be deferred
*/
static int sdp_requires_deferral(struct ast_sip_session *session, const pjmedia_sdp_session *sdp)
{
int i;
for (i = 0; i < sdp->media_count; ++i) {
/* See if there are registered handlers for this media stream type */
char media[20];
struct ast_sip_session_sdp_handler *handler;
RAII_VAR(struct sdp_handler_list *, handler_list, NULL, ao2_cleanup);
RAII_VAR(struct ast_sip_session_media *, session_media, NULL, ao2_cleanup);
enum ast_sip_session_sdp_stream_defer res;
/* We need a null-terminated version of the media string */
ast_copy_pj_str(media, &sdp->media[i]->desc.media, sizeof(media));
session_media = ao2_find(session->media, media, OBJ_KEY);
if (!session_media) {
/* if the session_media doesn't exist, there weren't
* any handlers at the time of its creation */
continue;
}
if (session_media->handler) {
handler = session_media->handler;
if (handler->defer_incoming_sdp_stream) {
res = handler->defer_incoming_sdp_stream(session, session_media, sdp,
sdp->media[i]);
switch (res) {
case AST_SIP_SESSION_SDP_DEFER_NOT_HANDLED:
break;
case AST_SIP_SESSION_SDP_DEFER_ERROR:
return 0;
case AST_SIP_SESSION_SDP_DEFER_NOT_NEEDED:
break;
case AST_SIP_SESSION_SDP_DEFER_NEEDED:
return 1;
}
}
/* Handled by this handler. Move to the next stream */
continue;
}
handler_list = ao2_find(sdp_handlers, media, OBJ_KEY);
if (!handler_list) {
ast_debug(1, "No registered SDP handlers for media type '%s'\n", media);
continue;
}
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
if (handler == session_media->handler) {
continue;
}
if (!handler->defer_incoming_sdp_stream) {
continue;
}
res = handler->defer_incoming_sdp_stream(session, session_media, sdp,
sdp->media[i]);
switch (res) {
case AST_SIP_SESSION_SDP_DEFER_NOT_HANDLED:
continue;
case AST_SIP_SESSION_SDP_DEFER_ERROR:
session_media_set_handler(session_media, handler);
return 0;
case AST_SIP_SESSION_SDP_DEFER_NOT_NEEDED:
/* Handled by this handler. */
session_media_set_handler(session_media, handler);
break;
case AST_SIP_SESSION_SDP_DEFER_NEEDED:
/* Handled by this handler. */
session_media_set_handler(session_media, handler);
return 1;
}
/* Move to the next stream */
break;
}
}
return 0;
}
static pj_bool_t session_reinvite_on_rx_request(pjsip_rx_data *rdata)
{
pjsip_dialog *dlg;
RAII_VAR(struct ast_sip_session *, session, NULL, ao2_cleanup);
pjsip_rdata_sdp_info *sdp_info;
if (rdata->msg_info.msg->line.req.method.id != PJSIP_INVITE_METHOD ||
!(dlg = pjsip_ua_find_dialog(&rdata->msg_info.cid->id, &rdata->msg_info.to->tag, &rdata->msg_info.from->tag, PJ_FALSE)) ||
!(session = ast_sip_dialog_get_session(dlg)) ||
!session->channel) {
return PJ_FALSE;
}
if (session->deferred_reinvite) {
pj_str_t key, deferred_key;
pjsip_tx_data *tdata;
/* We use memory from the new request on purpose so the deferred reinvite pool does not grow uncontrollably */
pjsip_tsx_create_key(rdata->tp_info.pool, &key, PJSIP_ROLE_UAS, &rdata->msg_info.cseq->method, rdata);
pjsip_tsx_create_key(rdata->tp_info.pool, &deferred_key, PJSIP_ROLE_UAS, &session->deferred_reinvite->msg_info.cseq->method,
session->deferred_reinvite);
/* If this is a retransmission ignore it */
if (!pj_strcmp(&key, &deferred_key)) {
return PJ_TRUE;
}
/* Otherwise this is a new re-invite, so reject it */
if (pjsip_dlg_create_response(dlg, rdata, 491, NULL, &tdata) == PJ_SUCCESS) {
pjsip_endpt_send_response2(ast_sip_get_pjsip_endpoint(), rdata, tdata, NULL, NULL);
}
return PJ_TRUE;
}
if (!(sdp_info = pjsip_rdata_get_sdp_info(rdata)) ||
(sdp_info->sdp_err != PJ_SUCCESS)) {
return PJ_FALSE;
}
if (!sdp_info->sdp) {
const pjmedia_sdp_session *local;
int i;
ast_queue_unhold(session->channel);
pjmedia_sdp_neg_get_active_local(session->inv_session->neg, &local);
if (!local) {
return PJ_FALSE;
}
/*
* Some devices indicate hold with deferred SDP reinvites (i.e. no SDP in the reinvite).
* When hold is initially indicated, we
* - Receive an INVITE with no SDP
* - Send a 200 OK with SDP, indicating sendrecv in the media streams
* - Receive an ACK with SDP, indicating sendonly in the media streams
*
* At this point, the pjmedia negotiator saves the state of the media direction so that
* if we are to send any offers, we'll offer recvonly in the media streams. This is
* problematic if the device is attempting to unhold, though. If the device unholds
* by sending a reinvite with no SDP, then we will respond with a 200 OK with recvonly.
* According to RFC 3264, if an offerer offers recvonly, then the answerer MUST respond
* with sendonly or inactive. The result of this is that the stream is not off hold.
*
* Therefore, in this case, when we receive a reinvite while the stream is on hold, we
* need to be sure to offer sendrecv. This way, the answerer can respond with sendrecv
* in order to get the stream off hold. If this is actually a different purpose reinvite
* (like a session timer refresh), then the answerer can respond to our sendrecv with
* sendonly, keeping the stream on hold.
*/
for (i = 0; i < local->media_count; ++i) {
pjmedia_sdp_media *m = local->media[i];
pjmedia_sdp_attr *recvonly;
pjmedia_sdp_attr *inactive;
recvonly = pjmedia_sdp_attr_find2(m->attr_count, m->attr, "recvonly", NULL);
inactive = pjmedia_sdp_attr_find2(m->attr_count, m->attr, "inactive", NULL);
if (recvonly || inactive) {
pjmedia_sdp_attr *to_remove = recvonly ?: inactive;
pjmedia_sdp_attr *sendrecv;
pjmedia_sdp_attr_remove(&m->attr_count, m->attr, to_remove);
sendrecv = pjmedia_sdp_attr_create(session->inv_session->pool, "sendrecv", NULL);
pjmedia_sdp_media_add_attr(m, sendrecv);
}
}
return PJ_FALSE;
}
if (!sdp_requires_deferral(session, sdp_info->sdp)) {
return PJ_FALSE;
}
pjsip_rx_data_clone(rdata, 0, &session->deferred_reinvite);
return PJ_TRUE;
}
void ast_sip_session_resume_reinvite(struct ast_sip_session *session)
{
if (!session->deferred_reinvite) {
return;
}
if (session->channel) {
pjsip_endpt_process_rx_data(ast_sip_get_pjsip_endpoint(),
session->deferred_reinvite, NULL, NULL);
}
pjsip_rx_data_free_cloned(session->deferred_reinvite);
session->deferred_reinvite = NULL;
}
static pjsip_module session_reinvite_module = {
.name = { "Session Re-Invite Module", 24 },
.priority = PJSIP_MOD_PRIORITY_UA_PROXY_LAYER - 1,
.on_rx_request = session_reinvite_on_rx_request,
};
void ast_sip_session_send_request_with_cb(struct ast_sip_session *session, pjsip_tx_data *tdata,
ast_sip_session_response_cb on_response)
{
pjsip_inv_session *inv_session = session->inv_session;
if (inv_session->state == PJSIP_INV_STATE_DISCONNECTED) {
/* Don't try to do anything with a hung-up call */
return;
}
ast_sip_mod_data_set(tdata->pool, tdata->mod_data, session_module.id,
MOD_DATA_ON_RESPONSE, on_response);
handle_outgoing_request(session, tdata);
pjsip_inv_send_msg(session->inv_session, tdata);
return;
}
void ast_sip_session_send_request(struct ast_sip_session *session, pjsip_tx_data *tdata)
{
ast_sip_session_send_request_with_cb(session, tdata, NULL);
}
int ast_sip_session_create_invite(struct ast_sip_session *session, pjsip_tx_data **tdata)
{
pjmedia_sdp_session *offer;
if (!(offer = create_local_sdp(session->inv_session, session, NULL))) {
pjsip_inv_terminate(session->inv_session, 500, PJ_FALSE);
return -1;
}
pjsip_inv_set_local_sdp(session->inv_session, offer);
pjmedia_sdp_neg_set_prefer_remote_codec_order(session->inv_session->neg, PJ_FALSE);
#ifdef PJMEDIA_SDP_NEG_ANSWER_MULTIPLE_CODECS
if (!session->endpoint->preferred_codec_only) {
pjmedia_sdp_neg_set_answer_multiple_codecs(session->inv_session->neg, PJ_TRUE);
}
#endif
/*
* We MUST call set_from_header() before pjsip_inv_invite. If we don't, the
* From in the initial INVITE will be wrong but the rest of the messages will be OK.
*/
set_from_header(session);
if (pjsip_inv_invite(session->inv_session, tdata) != PJ_SUCCESS) {
return -1;
}
return 0;
}
static int datastore_hash(const void *obj, int flags)
{
const struct ast_datastore *datastore = obj;
const char *uid = flags & OBJ_KEY ? obj : datastore->uid;
ast_assert(uid != NULL);
return ast_str_hash(uid);
}
static int datastore_cmp(void *obj, void *arg, int flags)
{
const struct ast_datastore *datastore1 = obj;
const struct ast_datastore *datastore2 = arg;
const char *uid2 = flags & OBJ_KEY ? arg : datastore2->uid;
ast_assert(datastore1->uid != NULL);
ast_assert(uid2 != NULL);
return strcmp(datastore1->uid, uid2) ? 0 : CMP_MATCH | CMP_STOP;
}
static void session_media_dtor(void *obj)
{
struct ast_sip_session_media *session_media = obj;
struct sdp_handler_list *handler_list;
/* It is possible for SDP handlers to allocate memory on a session_media but
* not end up getting set as the handler for this session_media. This traversal
* ensures that all memory allocated by SDP handlers on the session_media is
* cleared (as well as file descriptors, etc.).
*/
handler_list = ao2_find(sdp_handlers, session_media->stream_type, OBJ_KEY);
if (handler_list) {
struct ast_sip_session_sdp_handler *handler;
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
handler->stream_destroy(session_media);
}
}
ao2_cleanup(handler_list);
if (session_media->srtp) {
ast_sdp_srtp_destroy(session_media->srtp);
}
}
static void session_destructor(void *obj)
{
struct ast_sip_session *session = obj;
struct ast_sip_session_supplement *supplement;
struct ast_sip_session_delayed_request *delay;
ast_debug(3, "Destroying SIP session with endpoint %s\n",
session->endpoint ? ast_sorcery_object_get_id(session->endpoint) : "<none>");
while ((supplement = AST_LIST_REMOVE_HEAD(&session->supplements, next))) {
if (supplement->session_destroy) {
supplement->session_destroy(session);
}
ast_free(supplement);
}
ast_taskprocessor_unreference(session->serializer);
ao2_cleanup(session->datastores);
ao2_cleanup(session->media);
AST_LIST_HEAD_DESTROY(&session->supplements);
while ((delay = AST_LIST_REMOVE_HEAD(&session->delayed_requests, next))) {
ast_free(delay);
}
ast_party_id_free(&session->id);
ao2_cleanup(session->endpoint);
ao2_cleanup(session->aor);
ao2_cleanup(session->contact);
ao2_cleanup(session->req_caps);
ao2_cleanup(session->direct_media_cap);
if (session->dsp) {
ast_dsp_free(session->dsp);
}
if (session->inv_session) {
pjsip_dlg_dec_session(session->inv_session->dlg, &session_module);
}
}
static int add_supplements(struct ast_sip_session *session)
{
struct ast_sip_session_supplement *iter;
SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);
AST_RWLIST_TRAVERSE(&session_supplements, iter, next) {
struct ast_sip_session_supplement *copy = supplement_dup(iter);
if (!copy) {
return -1;
}
AST_LIST_INSERT_TAIL(&session->supplements, copy, next);
}
return 0;
}
static int add_session_media(void *obj, void *arg, int flags)
{
struct sdp_handler_list *handler_list = obj;
struct ast_sip_session *session = arg;
RAII_VAR(struct ast_sip_session_media *, session_media, NULL, ao2_cleanup);
session_media = ao2_alloc(sizeof(*session_media) + strlen(handler_list->stream_type), session_media_dtor);
if (!session_media) {
return CMP_STOP;
}
session_media->encryption = session->endpoint->media.rtp.encryption;
session_media->keepalive_sched_id = -1;
session_media->timeout_sched_id = -1;
/* Safe use of strcpy */
strcpy(session_media->stream_type, handler_list->stream_type);
ao2_link(session->media, session_media);
return 0;
}
/*! \brief Destructor for SIP channel */
static void sip_channel_destroy(void *obj)
{
struct ast_sip_channel_pvt *channel = obj;
ao2_cleanup(channel->pvt);
ao2_cleanup(channel->session);
}
struct ast_sip_channel_pvt *ast_sip_channel_pvt_alloc(void *pvt, struct ast_sip_session *session)
{
struct ast_sip_channel_pvt *channel = ao2_alloc(sizeof(*channel), sip_channel_destroy);
if (!channel) {
return NULL;
}
ao2_ref(pvt, +1);
channel->pvt = pvt;
ao2_ref(session, +1);
channel->session = session;
return channel;
}
struct ast_sip_session *ast_sip_session_alloc(struct ast_sip_endpoint *endpoint,
struct ast_sip_contact *contact, pjsip_inv_session *inv_session, pjsip_rx_data *rdata)
{
RAII_VAR(struct ast_sip_session *, session, NULL, ao2_cleanup);
struct ast_sip_session_supplement *iter;
int dsp_features = 0;
session = ao2_alloc(sizeof(*session), session_destructor);
if (!session) {
return NULL;
}
AST_LIST_HEAD_INIT(&session->supplements);
session->datastores = ao2_container_alloc(DATASTORE_BUCKETS, datastore_hash, datastore_cmp);
if (!session->datastores) {
return NULL;
}
session->endpoint = ao2_bump(endpoint);
session->media = ao2_container_alloc(MEDIA_BUCKETS, session_media_hash, session_media_cmp);
if (!session->media) {
return NULL;
}
/* fill session->media with available types */
ao2_callback(sdp_handlers, OBJ_NODATA, add_session_media, session);
if (rdata) {
/*
* We must continue using the serializer that the original
* INVITE came in on for the dialog. There may be
* retransmissions already enqueued in the original
* serializer that can result in reentrancy and message
* sequencing problems.
*/
session->serializer = ast_sip_get_distributor_serializer(rdata);
} else {
char tps_name[AST_TASKPROCESSOR_MAX_NAME + 1];
/* Create name with seq number appended. */
ast_taskprocessor_build_name(tps_name, sizeof(tps_name), "pjsip/outsess/%s",
ast_sorcery_object_get_id(endpoint));
session->serializer = ast_sip_create_serializer(tps_name);
}
if (!session->serializer) {
return NULL;
}
ast_sip_dialog_set_serializer(inv_session->dlg, session->serializer);
ast_sip_dialog_set_endpoint(inv_session->dlg, endpoint);
pjsip_dlg_inc_session(inv_session->dlg, &session_module);
inv_session->mod_data[session_module.id] = ao2_bump(session);
session->contact = ao2_bump(contact);
session->inv_session = inv_session;
session->req_caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
if (!session->req_caps) {
/* Release the ref held by session->inv_session */
ao2_ref(session, -1);
return NULL;
}
if ((endpoint->dtmf == AST_SIP_DTMF_INBAND) || (endpoint->dtmf == AST_SIP_DTMF_AUTO)) {
dsp_features |= DSP_FEATURE_DIGIT_DETECT;
}
if (endpoint->faxdetect) {
dsp_features |= DSP_FEATURE_FAX_DETECT;
}
if (dsp_features) {
if (!(session->dsp = ast_dsp_new())) {
/* Release the ref held by session->inv_session */
ao2_ref(session, -1);
return NULL;
}
ast_dsp_set_features(session->dsp, dsp_features);
}
if (add_supplements(session)) {
/* Release the ref held by session->inv_session */
ao2_ref(session, -1);
return NULL;
}
AST_LIST_TRAVERSE(&session->supplements, iter, next) {
if (iter->session_begin) {
iter->session_begin(session);
}
}
session->direct_media_cap = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
AST_LIST_HEAD_INIT_NOLOCK(&session->delayed_requests);
ast_party_id_init(&session->id);
ao2_ref(session, +1);
return session;
}
/*! \brief struct controlling the suspension of the session's serializer. */
struct ast_sip_session_suspender {
ast_cond_t cond_suspended;
ast_cond_t cond_complete;
int suspended;
int complete;
};
static void sip_session_suspender_dtor(void *vdoomed)
{
struct ast_sip_session_suspender *doomed = vdoomed;
ast_cond_destroy(&doomed->cond_suspended);
ast_cond_destroy(&doomed->cond_complete);
}
/*!
* \internal
* \brief Block the session serializer thread task.
*
* \param data Pushed serializer task data for suspension.
*
* \retval 0
*/
static int sip_session_suspend_task(void *data)
{
struct ast_sip_session_suspender *suspender = data;
ao2_lock(suspender);
/* Signal that the serializer task is now suspended. */
suspender->suspended = 1;
ast_cond_signal(&suspender->cond_suspended);
/* Wait for the the serializer suspension to be completed. */
while (!suspender->complete) {
ast_cond_wait(&suspender->cond_complete, ao2_object_get_lockaddr(suspender));
}
ao2_unlock(suspender);
ao2_ref(suspender, -1);
return 0;
}
void ast_sip_session_suspend(struct ast_sip_session *session)
{
struct ast_sip_session_suspender *suspender;
int res;
ast_assert(session->suspended == NULL);
if (ast_taskprocessor_is_task(session->serializer)) {
/* I am the session's serializer thread so I cannot suspend. */
return;
}
if (ast_taskprocessor_is_suspended(session->serializer)) {
/* The serializer already suspended. */
return;
}
suspender = ao2_alloc(sizeof(*suspender), sip_session_suspender_dtor);
if (!suspender) {
/* We will just have to hope that the system does not deadlock */
return;
}
ast_cond_init(&suspender->cond_suspended, NULL);
ast_cond_init(&suspender->cond_complete, NULL);
ao2_ref(suspender, +1);
res = ast_sip_push_task(session->serializer, sip_session_suspend_task, suspender);
if (res) {
/* We will just have to hope that the system does not deadlock */
ao2_ref(suspender, -2);
return;
}
session->suspended = suspender;
/* Wait for the serializer to get suspended. */
ao2_lock(suspender);
while (!suspender->suspended) {
ast_cond_wait(&suspender->cond_suspended, ao2_object_get_lockaddr(suspender));
}
ao2_unlock(suspender);
ast_taskprocessor_suspend(session->serializer);
}
void ast_sip_session_unsuspend(struct ast_sip_session *session)
{
struct ast_sip_session_suspender *suspender = session->suspended;
if (!suspender) {
/* Nothing to do */
return;
}
session->suspended = NULL;
/* Signal that the serializer task suspension is now complete. */
ao2_lock(suspender);
suspender->complete = 1;
ast_cond_signal(&suspender->cond_complete);
ao2_unlock(suspender);
ao2_ref(suspender, -1);
ast_taskprocessor_unsuspend(session->serializer);
}
/*!
* \internal
* \brief Handle initial INVITE challenge response message.
* \since 13.5.0
*
* \param rdata PJSIP receive response message data.
*
* \retval PJ_FALSE Did not handle message.
* \retval PJ_TRUE Handled message.
*/
static pj_bool_t outbound_invite_auth(pjsip_rx_data *rdata)
{
pjsip_transaction *tsx;
pjsip_dialog *dlg;
pjsip_inv_session *inv;
pjsip_tx_data *tdata;
struct ast_sip_session *session;
if (rdata->msg_info.msg->line.status.code != 401
&& rdata->msg_info.msg->line.status.code != 407) {
/* Doesn't pertain to us. Move on */
return PJ_FALSE;
}
tsx = pjsip_rdata_get_tsx(rdata);
dlg = pjsip_rdata_get_dlg(rdata);
if (!dlg || !tsx) {
return PJ_FALSE;
}
if (tsx->method.id != PJSIP_INVITE_METHOD) {
/* Not an INVITE that needs authentication */
return PJ_FALSE;
}
inv = pjsip_dlg_get_inv_session(dlg);
if (PJSIP_INV_STATE_CONFIRMED <= inv->state) {
/*
* We cannot handle reINVITE authentication at this
* time because the reINVITE transaction is still in
* progress.
*/
ast_debug(1, "A reINVITE is being challenged.\n");
return PJ_FALSE;
}
ast_debug(1, "Initial INVITE is being challenged.\n");
session = inv->mod_data[session_module.id];
if (ast_sip_create_request_with_auth(&session->endpoint->outbound_auths, rdata,
tsx->last_tx, &tdata)) {
return PJ_FALSE;
}
/*
* Restart the outgoing initial INVITE transaction to deal
* with authentication.
*/
pjsip_inv_uac_restart(inv, PJ_FALSE);
ast_sip_session_send_request(session, tdata);
return PJ_TRUE;
}
static pjsip_module outbound_invite_auth_module = {
.name = {"Outbound INVITE Auth", 20},
.priority = PJSIP_MOD_PRIORITY_DIALOG_USAGE,
.on_rx_response = outbound_invite_auth,
};
/*!
* \internal
* \brief Setup outbound initial INVITE authentication.
* \since 13.5.0
*
* \param dlg PJSIP dialog to attach outbound authentication.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int setup_outbound_invite_auth(pjsip_dialog *dlg)
{
pj_status_t status;
++dlg->sess_count;
status = pjsip_dlg_add_usage(dlg, &outbound_invite_auth_module, NULL);
--dlg->sess_count;
return status != PJ_SUCCESS ? -1 : 0;
}
struct ast_sip_session *ast_sip_session_create_outgoing(struct ast_sip_endpoint *endpoint,
struct ast_sip_contact *contact, const char *location, const char *request_user,
struct ast_format_cap *req_caps)
{
const char *uri = NULL;
RAII_VAR(struct ast_sip_aor *, found_aor, NULL, ao2_cleanup);
RAII_VAR(struct ast_sip_contact *, found_contact, NULL, ao2_cleanup);
pjsip_timer_setting timer;
pjsip_dialog *dlg;
struct pjsip_inv_session *inv_session;
RAII_VAR(struct ast_sip_session *, session, NULL, ao2_cleanup);
/* If no location has been provided use the AOR list from the endpoint itself */
if (location || !contact) {
location = S_OR(location, endpoint->aors);
ast_sip_location_retrieve_contact_and_aor_from_list(location, &found_aor, &found_contact);
if (!found_contact || ast_strlen_zero(found_contact->uri)) {
uri = location;
} else {
uri = found_contact->uri;
}
} else {
uri = contact->uri;
}
/* If we still have no URI to dial fail to create the session */
if (ast_strlen_zero(uri)) {
ast_log(LOG_ERROR, "Endpoint '%s': No URI available. Is endpoint registered?\n",
ast_sorcery_object_get_id(endpoint));
return NULL;
}
if (!(dlg = ast_sip_create_dialog_uac(endpoint, uri, request_user))) {
return NULL;
}
if (setup_outbound_invite_auth(dlg)) {
pjsip_dlg_terminate(dlg);
return NULL;
}
if (pjsip_inv_create_uac(dlg, NULL, endpoint->extensions.flags, &inv_session) != PJ_SUCCESS) {
pjsip_dlg_terminate(dlg);
return NULL;
}
#if defined(HAVE_PJSIP_REPLACE_MEDIA_STREAM) || defined(PJMEDIA_SDP_NEG_ALLOW_MEDIA_CHANGE)
inv_session->sdp_neg_flags = PJMEDIA_SDP_NEG_ALLOW_MEDIA_CHANGE;
#endif
pjsip_timer_setting_default(&timer);
timer.min_se = endpoint->extensions.timer.min_se;
timer.sess_expires = endpoint->extensions.timer.sess_expires;
pjsip_timer_init_session(inv_session, &timer);
session = ast_sip_session_alloc(endpoint, found_contact ? found_contact : contact,
inv_session, NULL);
if (!session) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
return NULL;
}
session->aor = ao2_bump(found_aor);
ast_party_id_copy(&session->id, &endpoint->id.self);
if (ast_format_cap_count(req_caps)) {
/* get joint caps between req_caps and endpoint caps */
struct ast_format_cap *joint_caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
ast_format_cap_get_compatible(req_caps, session->endpoint->media.codecs, joint_caps);
/* if joint caps */
if (ast_format_cap_count(joint_caps)) {
/* copy endpoint caps into session->req_caps */
ast_format_cap_append_from_cap(session->req_caps, session->endpoint->media.codecs, AST_MEDIA_TYPE_UNKNOWN);
/* replace instances of joint caps equivalents in session->req_caps */
ast_format_cap_replace_from_cap(session->req_caps, joint_caps, AST_MEDIA_TYPE_UNKNOWN);
}
ao2_cleanup(joint_caps);
}
if (pjsip_dlg_add_usage(dlg, &session_module, NULL) != PJ_SUCCESS) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
/* Since we are not notifying ourselves that the INVITE session is being terminated
* we need to manually drop its reference to session
*/
ao2_ref(session, -1);
return NULL;
}
ao2_ref(session, +1);
return session;
}
void ast_sip_session_terminate(struct ast_sip_session *session, int response)
{
pj_status_t status;
pjsip_tx_data *packet = NULL;
if (session->defer_terminate) {
session->terminate_while_deferred = 1;
return;
}
if (!response) {
response = 603;
}
switch (session->inv_session->state) {
case PJSIP_INV_STATE_NULL:
pjsip_inv_terminate(session->inv_session, response, PJ_TRUE);
break;
case PJSIP_INV_STATE_CONFIRMED:
if (session->inv_session->invite_tsx) {
ast_debug(3, "Delay sending BYE to %s because of outstanding transaction...\n",
ast_sorcery_object_get_id(session->endpoint));
/* If this is delayed the only thing that will happen is a BYE request so we don't
* actually need to store the response code for when it happens.
*/
delay_request(session, NULL, NULL, NULL, 0, DELAYED_METHOD_BYE);
break;
}
/* Fall through */
default:
status = pjsip_inv_end_session(session->inv_session, response, NULL, &packet);
if (status == PJ_SUCCESS && packet) {
struct ast_sip_session_delayed_request *delay;
/* Flush any delayed requests so they cannot overlap this transaction. */
while ((delay = AST_LIST_REMOVE_HEAD(&session->delayed_requests, next))) {
ast_free(delay);
}
if (packet->msg->type == PJSIP_RESPONSE_MSG) {
ast_sip_session_send_response(session, packet);
} else {
ast_sip_session_send_request(session, packet);
}
}
break;
}
}
static int session_termination_task(void *data)
{
struct ast_sip_session *session = data;
if (session->defer_terminate) {
session->defer_terminate = 0;
if (session->inv_session) {
ast_sip_session_terminate(session, 0);
}
}
ao2_ref(session, -1);
return 0;
}
static void session_termination_cb(pj_timer_heap_t *timer_heap, struct pj_timer_entry *entry)
{
struct ast_sip_session *session = entry->user_data;
if (ast_sip_push_task(session->serializer, session_termination_task, session)) {
ao2_cleanup(session);
}
}
int ast_sip_session_defer_termination(struct ast_sip_session *session)
{
pj_time_val delay = { .sec = 60, };
int res;
/* The session should not have an active deferred termination request. */
ast_assert(!session->defer_terminate);
session->defer_terminate = 1;
session->scheduled_termination.id = 0;
ao2_ref(session, +1);
session->scheduled_termination.user_data = session;
session->scheduled_termination.cb = session_termination_cb;
res = (pjsip_endpt_schedule_timer(ast_sip_get_pjsip_endpoint(),
&session->scheduled_termination, &delay) != PJ_SUCCESS) ? -1 : 0;
if (res) {
session->defer_terminate = 0;
ao2_ref(session, -1);
}
return res;
}
/*!
* \internal
* \brief Stop the defer termination timer if it is still running.
* \since 13.5.0
*
* \param session Which session to stop the timer.
*
* \return Nothing
*/
static void sip_session_defer_termination_stop_timer(struct ast_sip_session *session)
{
if (pj_timer_heap_cancel(pjsip_endpt_get_timer_heap(ast_sip_get_pjsip_endpoint()),
&session->scheduled_termination)) {
ao2_ref(session, -1);
}
}
void ast_sip_session_defer_termination_cancel(struct ast_sip_session *session)
{
if (!session->defer_terminate) {
/* Already canceled or timer fired. */
return;
}
session->defer_terminate = 0;
if (session->terminate_while_deferred) {
/* Complete the termination started by the upper layer. */
ast_sip_session_terminate(session, 0);
}
/* Stop the termination timer if it is still running. */
sip_session_defer_termination_stop_timer(session);
}
struct ast_sip_session *ast_sip_dialog_get_session(pjsip_dialog *dlg)
{
pjsip_inv_session *inv_session = pjsip_dlg_get_inv_session(dlg);
struct ast_sip_session *session;
if (!inv_session ||
!(session = inv_session->mod_data[session_module.id])) {
return NULL;
}
ao2_ref(session, +1);
return session;
}
enum sip_get_destination_result {
/*! The extension was successfully found */
SIP_GET_DEST_EXTEN_FOUND,
/*! The extension specified in the RURI was not found */
SIP_GET_DEST_EXTEN_NOT_FOUND,
/*! The extension specified in the RURI was a partial match */
SIP_GET_DEST_EXTEN_PARTIAL,
/*! The RURI is of an unsupported scheme */
SIP_GET_DEST_UNSUPPORTED_URI,
};
/*!
* \brief Determine where in the dialplan a call should go
*
* This uses the username in the request URI to try to match
* an extension in the endpoint's configured context in order
* to route the call.
*
* \param session The inbound SIP session
* \param rdata The SIP INVITE
*/
static enum sip_get_destination_result get_destination(struct ast_sip_session *session, pjsip_rx_data *rdata)
{
pjsip_uri *ruri = rdata->msg_info.msg->line.req.uri;
pjsip_sip_uri *sip_ruri;
struct ast_features_pickup_config *pickup_cfg;
const char *pickupexten;
if (!PJSIP_URI_SCHEME_IS_SIP(ruri) && !PJSIP_URI_SCHEME_IS_SIPS(ruri)) {
return SIP_GET_DEST_UNSUPPORTED_URI;
}
sip_ruri = pjsip_uri_get_uri(ruri);
ast_copy_pj_str(session->exten, &sip_ruri->user, sizeof(session->exten));
/*
* We may want to match in the dialplan without any user
* options getting in the way.
*/
AST_SIP_USER_OPTIONS_TRUNCATE_CHECK(session->exten);
pickup_cfg = ast_get_chan_features_pickup_config(session->channel);
if (!pickup_cfg) {
ast_log(LOG_ERROR, "Unable to retrieve pickup configuration options. Unable to detect call pickup extension\n");
pickupexten = "";
} else {
pickupexten = ast_strdupa(pickup_cfg->pickupexten);
ao2_ref(pickup_cfg, -1);
}
if (!strcmp(session->exten, pickupexten) ||
ast_exists_extension(NULL, session->endpoint->context, session->exten, 1, NULL)) {
size_t size = pj_strlen(&sip_ruri->host) + 1;
char *domain = ast_alloca(size);
ast_copy_pj_str(domain, &sip_ruri->host, size);
pbx_builtin_setvar_helper(session->channel, "SIPDOMAIN", domain);
return SIP_GET_DEST_EXTEN_FOUND;
}
/*
* Check for partial match via overlap dialling (if enabled)
*/
if (session->endpoint->allow_overlap && (
!strncmp(session->exten, pickupexten, strlen(session->exten)) ||
ast_canmatch_extension(NULL, session->endpoint->context, session->exten, 1, NULL))) {
/* Overlap partial match */
return SIP_GET_DEST_EXTEN_PARTIAL;
}
return SIP_GET_DEST_EXTEN_NOT_FOUND;
}
static pjsip_inv_session *pre_session_setup(pjsip_rx_data *rdata, const struct ast_sip_endpoint *endpoint)
{
pjsip_tx_data *tdata;
pjsip_dialog *dlg;
pjsip_inv_session *inv_session;
unsigned int options = endpoint->extensions.flags;
pj_status_t dlg_status;
if (pjsip_inv_verify_request(rdata, &options, NULL, NULL, ast_sip_get_pjsip_endpoint(), &tdata) != PJ_SUCCESS) {
if (tdata) {
pjsip_endpt_send_response2(ast_sip_get_pjsip_endpoint(), rdata, tdata, NULL, NULL);
} else {
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
}
return NULL;
}
dlg = ast_sip_create_dialog_uas(endpoint, rdata, &dlg_status);
if (!dlg) {
if (dlg_status != PJ_EEXISTS) {
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
}
return NULL;
}
if (pjsip_inv_create_uas(dlg, rdata, NULL, options, &inv_session) != PJ_SUCCESS) {
pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
pjsip_dlg_terminate(dlg);
return NULL;
}
#if defined(HAVE_PJSIP_REPLACE_MEDIA_STREAM) || defined(PJMEDIA_SDP_NEG_ALLOW_MEDIA_CHANGE)
inv_session->sdp_neg_flags = PJMEDIA_SDP_NEG_ALLOW_MEDIA_CHANGE;
#endif
if (pjsip_dlg_add_usage(dlg, &session_module, NULL) != PJ_SUCCESS) {
if (pjsip_inv_initial_answer(inv_session, rdata, 500, NULL, NULL, &tdata) != PJ_SUCCESS) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
}
pjsip_inv_send_msg(inv_session, tdata);
return NULL;
}
return inv_session;
}
struct new_invite {
/*! \brief Session created for the new INVITE */
struct ast_sip_session *session;
/*! \brief INVITE request itself */
pjsip_rx_data *rdata;
};
static void new_invite_destroy(void *obj)
{
struct new_invite *invite = obj;
ao2_cleanup(invite->session);
if (invite->rdata) {
pjsip_rx_data_free_cloned(invite->rdata);
}
}
static struct new_invite *new_invite_alloc(struct ast_sip_session *session, pjsip_rx_data *rdata)
{
struct new_invite *invite = ao2_alloc(sizeof(*invite), new_invite_destroy);
if (!invite) {
return NULL;
}
ao2_ref(session, +1);
invite->session = session;
if (pjsip_rx_data_clone(rdata, 0, &invite->rdata) != PJ_SUCCESS) {
ao2_ref(invite, -1);
return NULL;
}
return invite;
}
static int new_invite(void *data)
{
RAII_VAR(struct new_invite *, invite, data, ao2_cleanup);
pjsip_tx_data *tdata = NULL;
pjsip_timer_setting timer;
pjsip_rdata_sdp_info *sdp_info;
pjmedia_sdp_session *local = NULL;
/* From this point on, any calls to pjsip_inv_terminate have the last argument as PJ_TRUE
* so that we will be notified so we can destroy the session properly
*/
if (invite->session->inv_session->state == PJSIP_INV_STATE_DISCONNECTED) {
ast_log(LOG_ERROR, "Session already DISCONNECTED [reason=%d (%s)]\n",
invite->session->inv_session->cause,
pjsip_get_status_text(invite->session->inv_session->cause)->ptr);
#ifdef HAVE_PJSIP_INV_SESSION_REF
pjsip_inv_dec_ref(invite->session->inv_session);
#endif
return -1;
}
switch (get_destination(invite->session, invite->rdata)) {
case SIP_GET_DEST_EXTEN_FOUND:
/* Things worked. Keep going */
break;
case SIP_GET_DEST_UNSUPPORTED_URI:
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 416, NULL, NULL, &tdata) == PJ_SUCCESS) {
ast_sip_session_send_response(invite->session, tdata);
} else {
pjsip_inv_terminate(invite->session->inv_session, 416, PJ_TRUE);
}
goto end;
case SIP_GET_DEST_EXTEN_PARTIAL:
ast_debug(1, "Call from '%s' (%s:%s:%d) to extension '%s' - partial match\n", ast_sorcery_object_get_id(invite->session->endpoint),
invite->rdata->tp_info.transport->type_name, invite->rdata->pkt_info.src_name, invite->rdata->pkt_info.src_port, invite->session->exten);
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 484, NULL, NULL, &tdata) == PJ_SUCCESS) {
ast_sip_session_send_response(invite->session, tdata);
} else {
pjsip_inv_terminate(invite->session->inv_session, 484, PJ_TRUE);
}
goto end;
case SIP_GET_DEST_EXTEN_NOT_FOUND:
default:
ast_log(LOG_NOTICE, "Call from '%s' (%s:%s:%d) to extension '%s' rejected because extension not found in context '%s'.\n",
ast_sorcery_object_get_id(invite->session->endpoint), invite->rdata->tp_info.transport->type_name, invite->rdata->pkt_info.src_name,
invite->rdata->pkt_info.src_port, invite->session->exten, invite->session->endpoint->context);
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 404, NULL, NULL, &tdata) == PJ_SUCCESS) {
ast_sip_session_send_response(invite->session, tdata);
} else {
pjsip_inv_terminate(invite->session->inv_session, 404, PJ_TRUE);
}
goto end;
};
if ((sdp_info = pjsip_rdata_get_sdp_info(invite->rdata)) && (sdp_info->sdp_err == PJ_SUCCESS) && sdp_info->sdp) {
if (handle_incoming_sdp(invite->session, sdp_info->sdp)) {
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 488, NULL, NULL, &tdata) == PJ_SUCCESS) {
ast_sip_session_send_response(invite->session, tdata);
} else {
pjsip_inv_terminate(invite->session->inv_session, 488, PJ_TRUE);
}
goto end;
}
/* We are creating a local SDP which is an answer to their offer */
local = create_local_sdp(invite->session->inv_session, invite->session, sdp_info->sdp);
} else {
/* We are creating a local SDP which is an offer */
local = create_local_sdp(invite->session->inv_session, invite->session, NULL);
}
/* If we were unable to create a local SDP terminate the session early, it won't go anywhere */
if (!local) {
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 500, NULL, NULL, &tdata) == PJ_SUCCESS) {
ast_sip_session_send_response(invite->session, tdata);
} else {
pjsip_inv_terminate(invite->session->inv_session, 500, PJ_TRUE);
}
goto end;
} else {
pjsip_inv_set_local_sdp(invite->session->inv_session, local);
pjmedia_sdp_neg_set_prefer_remote_codec_order(invite->session->inv_session->neg, PJ_FALSE);
#ifdef PJMEDIA_SDP_NEG_ANSWER_MULTIPLE_CODECS
if (!invite->session->endpoint->preferred_codec_only) {
pjmedia_sdp_neg_set_answer_multiple_codecs(invite->session->inv_session->neg, PJ_TRUE);
}
#endif
}
pjsip_timer_setting_default(&timer);
timer.min_se = invite->session->endpoint->extensions.timer.min_se;
timer.sess_expires = invite->session->endpoint->extensions.timer.sess_expires;
pjsip_timer_init_session(invite->session->inv_session, &timer);
/* At this point, we've verified what we can, so let's go ahead and send a 100 Trying out */
if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 100, NULL, NULL, &tdata) != PJ_SUCCESS) {
pjsip_inv_terminate(invite->session->inv_session, 500, PJ_TRUE);
goto end;
}
ast_sip_session_send_response(invite->session, tdata);
handle_incoming_request(invite->session, invite->rdata);
end:
#ifdef HAVE_PJSIP_INV_SESSION_REF
pjsip_inv_dec_ref(invite->session->inv_session);
#endif
return 0;
}
static void handle_new_invite_request(pjsip_rx_data *rdata)
{
RAII_VAR(struct ast_sip_endpoint *, endpoint,
ast_pjsip_rdata_get_endpoint(rdata), ao2_cleanup);
pjsip_tx_data *tdata = NULL;
pjsip_inv_session *inv_session = NULL;
struct ast_sip_session *session;
struct new_invite *invite;
ast_assert(endpoint != NULL);
inv_session = pre_session_setup(rdata, endpoint);
if (!inv_session) {
/* pre_session_setup() returns a response on failure */
return;
}
#ifdef HAVE_PJSIP_INV_SESSION_REF
if (pjsip_inv_add_ref(inv_session) != PJ_SUCCESS) {
ast_log(LOG_ERROR, "Can't increase the session reference counter\n");
if (inv_session->state != PJSIP_INV_STATE_DISCONNECTED) {
if (pjsip_inv_initial_answer(inv_session, rdata, 500, NULL, NULL, &tdata) == PJ_SUCCESS) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
} else {
pjsip_inv_send_msg(inv_session, tdata);
}
}
return;
}
#endif
session = ast_sip_session_alloc(endpoint, NULL, inv_session, rdata);
if (!session) {
if (pjsip_inv_initial_answer(inv_session, rdata, 500, NULL, NULL, &tdata) == PJ_SUCCESS) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
} else {
pjsip_inv_send_msg(inv_session, tdata);
}
#ifdef HAVE_PJSIP_INV_SESSION_REF
pjsip_inv_dec_ref(inv_session);
#endif
return;
}
invite = new_invite_alloc(session, rdata);
if (!invite || ast_sip_push_task(session->serializer, new_invite, invite)) {
if (pjsip_inv_initial_answer(inv_session, rdata, 500, NULL, NULL, &tdata) == PJ_SUCCESS) {
pjsip_inv_terminate(inv_session, 500, PJ_FALSE);
} else {
pjsip_inv_send_msg(inv_session, tdata);
}
#ifdef HAVE_PJSIP_INV_SESSION_REF
pjsip_inv_dec_ref(inv_session);
#endif
ao2_cleanup(invite);
}
ao2_ref(session, -1);
}
static pj_bool_t does_method_match(const pj_str_t *message_method, const char *supplement_method)
{
pj_str_t method;
if (ast_strlen_zero(supplement_method)) {
return PJ_TRUE;
}
pj_cstr(&method, supplement_method);
return pj_stristr(&method, message_method) ? PJ_TRUE : PJ_FALSE;
}
static pj_bool_t has_supplement(const struct ast_sip_session *session, const pjsip_rx_data *rdata)
{
struct ast_sip_session_supplement *supplement;
struct pjsip_method *method = &rdata->msg_info.msg->line.req.method;
if (!session) {
return PJ_FALSE;
}
AST_LIST_TRAVERSE(&session->supplements, supplement, next) {
if (does_method_match(&method->name, supplement->method)) {
return PJ_TRUE;
}
}
return PJ_FALSE;
}
/*!
* \brief Called when a new SIP request comes into PJSIP
*
* This function is called under two circumstances
* 1) An out-of-dialog request is received by PJSIP
* 2) An in-dialog request that the inv_session layer does not
* handle is received (such as an in-dialog INFO)
*
* In all cases, there is very little we actually do in this function
* 1) For requests we don't handle, we return PJ_FALSE
* 2) For new INVITEs, throw the work into the SIP threadpool to be done
* there to free up the thread(s) handling incoming requests
* 3) For in-dialog requests we handle, we defer handling them until the
* on_inv_state_change() callback instead (where we will end up putting
* them into the threadpool).
*/
static pj_bool_t session_on_rx_request(pjsip_rx_data *rdata)
{
pj_status_t handled = PJ_FALSE;
pjsip_dialog *dlg = pjsip_rdata_get_dlg(rdata);
pjsip_inv_session *inv_session;
switch (rdata->msg_info.msg->line.req.method.id) {
case PJSIP_INVITE_METHOD:
if (dlg) {
ast_log(LOG_WARNING, "on_rx_request called for INVITE in mid-dialog?\n");
break;
}
handled = PJ_TRUE;
handle_new_invite_request(rdata);
break;
default:
/* Handle other in-dialog methods if their supplements have been registered */
handled = dlg && (inv_session = pjsip_dlg_get_inv_session(dlg)) &&
has_supplement(inv_session->mod_data[session_module.id], rdata);
break;
}
return handled;
}
static void resend_reinvite(pj_timer_heap_t *timer, pj_timer_entry *entry)
{
struct ast_sip_session *session = entry->user_data;
ast_debug(3, "Endpoint '%s(%s)' re-INVITE collision timer expired.\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "");
if (AST_LIST_EMPTY(&session->delayed_requests)) {
/* No delayed request pending, so just return */
ao2_ref(session, -1);
return;
}
if (ast_sip_push_task(session->serializer, invite_collision_timeout, session)) {
/*
* Uh oh. We now have nothing in the foreseeable future
* to trigger sending the delayed requests.
*/
ao2_ref(session, -1);
}
}
static void reschedule_reinvite(struct ast_sip_session *session, ast_sip_session_response_cb on_response)
{
pjsip_inv_session *inv = session->inv_session;
pj_time_val tv;
ast_debug(3, "Endpoint '%s(%s)' re-INVITE collision.\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "");
if (delay_request(session, NULL, NULL, on_response, 1, DELAYED_METHOD_INVITE)) {
return;
}
if (pj_timer_entry_running(&session->rescheduled_reinvite)) {
/* Timer already running. Something weird is going on. */
ast_debug(1, "Endpoint '%s(%s)' re-INVITE collision while timer running!!!\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "");
return;
}
tv.sec = 0;
if (inv->role == PJSIP_ROLE_UAC) {
tv.msec = 2100 + ast_random() % 2000;
} else {
tv.msec = ast_random() % 2000;
}
pj_timer_entry_init(&session->rescheduled_reinvite, 0, session, resend_reinvite);
ao2_ref(session, +1);
if (pjsip_endpt_schedule_timer(ast_sip_get_pjsip_endpoint(),
&session->rescheduled_reinvite, &tv) != PJ_SUCCESS) {
ao2_ref(session, -1);
}
}
static void __print_debug_details(const char *function, pjsip_inv_session *inv, pjsip_transaction *tsx, pjsip_event *e)
{
int id = session_module.id;
struct ast_sip_session *session = NULL;
if (!DEBUG_ATLEAST(5)) {
/* Debug not spamy enough */
return;
}
ast_log(LOG_DEBUG, "Function %s called on event %s\n",
function, pjsip_event_str(e->type));
if (!inv) {
ast_log(LOG_DEBUG, "Transaction %p does not belong to an inv_session?\n", tsx);
ast_log(LOG_DEBUG, "The transaction state is %s\n",
pjsip_tsx_state_str(tsx->state));
return;
}
if (id > -1) {
session = inv->mod_data[session_module.id];
}
if (!session) {
ast_log(LOG_DEBUG, "inv_session %p has no ast session\n", inv);
} else {
ast_log(LOG_DEBUG, "The state change pertains to the endpoint '%s(%s)'\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "");
}
if (inv->invite_tsx) {
ast_log(LOG_DEBUG, "The inv session still has an invite_tsx (%p)\n",
inv->invite_tsx);
} else {
ast_log(LOG_DEBUG, "The inv session does NOT have an invite_tsx\n");
}
if (tsx) {
ast_log(LOG_DEBUG, "The %s %.*s transaction involved in this state change is %p\n",
pjsip_role_name(tsx->role),
(int) pj_strlen(&tsx->method.name), pj_strbuf(&tsx->method.name),
tsx);
ast_log(LOG_DEBUG, "The current transaction state is %s\n",
pjsip_tsx_state_str(tsx->state));
ast_log(LOG_DEBUG, "The transaction state change event is %s\n",
pjsip_event_str(e->body.tsx_state.type));
} else {
ast_log(LOG_DEBUG, "There is no transaction involved in this state change\n");
}
ast_log(LOG_DEBUG, "The current inv state is %s\n", pjsip_inv_state_name(inv->state));
}
#define print_debug_details(inv, tsx, e) __print_debug_details(__PRETTY_FUNCTION__, (inv), (tsx), (e))
static void handle_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
{
struct ast_sip_session_supplement *supplement;
struct pjsip_request_line req = rdata->msg_info.msg->line.req;
ast_debug(3, "Method is %.*s\n", (int) pj_strlen(&req.method.name), pj_strbuf(&req.method.name));
AST_LIST_TRAVERSE(&session->supplements, supplement, next) {
if (supplement->incoming_request && does_method_match(&req.method.name, supplement->method)) {
if (supplement->incoming_request(session, rdata)) {
break;
}
}
}
}
static void handle_incoming_response(struct ast_sip_session *session, pjsip_rx_data *rdata,
enum ast_sip_session_response_priority response_priority)
{
struct ast_sip_session_supplement *supplement;
struct pjsip_status_line status = rdata->msg_info.msg->line.status;
ast_debug(3, "Response is %d %.*s\n", status.code, (int) pj_strlen(&status.reason),
pj_strbuf(&status.reason));
AST_LIST_TRAVERSE(&session->supplements, supplement, next) {
if (!(supplement->response_priority & response_priority)) {
continue;
}
if (supplement->incoming_response && does_method_match(&rdata->msg_info.cseq->method.name, supplement->method)) {
supplement->incoming_response(session, rdata);
}
}
}
static int handle_incoming(struct ast_sip_session *session, pjsip_rx_data *rdata,
enum ast_sip_session_response_priority response_priority)
{
ast_debug(3, "Received %s\n", rdata->msg_info.msg->type == PJSIP_REQUEST_MSG ?
"request" : "response");
if (rdata->msg_info.msg->type == PJSIP_REQUEST_MSG) {
handle_incoming_request(session, rdata);
} else {
handle_incoming_response(session, rdata, response_priority);
}
return 0;
}
static void handle_outgoing_request(struct ast_sip_session *session, pjsip_tx_data *tdata)
{
struct ast_sip_session_supplement *supplement;
struct pjsip_request_line req = tdata->msg->line.req;
ast_debug(3, "Method is %.*s\n", (int) pj_strlen(&req.method.name), pj_strbuf(&req.method.name));
AST_LIST_TRAVERSE(&session->supplements, supplement, next) {
if (supplement->outgoing_request && does_method_match(&req.method.name, supplement->method)) {
supplement->outgoing_request(session, tdata);
}
}
}
static void handle_outgoing_response(struct ast_sip_session *session, pjsip_tx_data *tdata)
{
struct ast_sip_session_supplement *supplement;
struct pjsip_status_line status = tdata->msg->line.status;
pjsip_cseq_hdr *cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL);
ast_debug(3, "Method is %.*s, Response is %d %.*s\n", (int) pj_strlen(&cseq->method.name),
pj_strbuf(&cseq->method.name), status.code, (int) pj_strlen(&status.reason),
pj_strbuf(&status.reason));
AST_LIST_TRAVERSE(&session->supplements, supplement, next) {
if (supplement->outgoing_response && does_method_match(&cseq->method.name, supplement->method)) {
supplement->outgoing_response(session, tdata);
}
}
}
static int session_end(void *vsession)
{
struct ast_sip_session *session = vsession;
struct ast_sip_session_supplement *iter;
/* Stop the scheduled termination */
sip_session_defer_termination_stop_timer(session);
/* Session is dead. Notify the supplements. */
AST_LIST_TRAVERSE(&session->supplements, iter, next) {
if (iter->session_end) {
iter->session_end(session);
}
}
return 0;
}
/*!
* \internal
* \brief Complete ending session activities.
* \since 13.5.0
*
* \param vsession Which session to complete stopping.
*
* \retval 0 on success.
* \retval -1 on error.
*/
static int session_end_completion(void *vsession)
{
struct ast_sip_session *session = vsession;
ast_sip_dialog_set_serializer(session->inv_session->dlg, NULL);
ast_sip_dialog_set_endpoint(session->inv_session->dlg, NULL);
/* Now we can release the ref that was held by session->inv_session */
ao2_cleanup(session);
return 0;
}
static int check_request_status(pjsip_inv_session *inv, pjsip_event *e)
{
struct ast_sip_session *session = inv->mod_data[session_module.id];
pjsip_transaction *tsx = e->body.tsx_state.tsx;
if (tsx->status_code != 503 && tsx->status_code != 408) {
return 0;
}
if (!ast_sip_failover_request(tsx->last_tx)) {
return 0;
}
pjsip_inv_uac_restart(inv, PJ_FALSE);
/*
* Bump the ref since it will be on a new transaction and
* we don't want it to go away along with the old transaction.
*/
pjsip_tx_data_add_ref(tsx->last_tx);
ast_sip_session_send_request(session, tsx->last_tx);
return 1;
}
static void handle_incoming_before_media(pjsip_inv_session *inv,
struct ast_sip_session *session, pjsip_rx_data *rdata)
{
pjsip_msg *msg;
handle_incoming(session, rdata, AST_SIP_SESSION_BEFORE_MEDIA);
msg = rdata->msg_info.msg;
if (msg->type == PJSIP_REQUEST_MSG
&& msg->line.req.method.id == PJSIP_ACK_METHOD
&& pjmedia_sdp_neg_get_state(inv->neg) != PJMEDIA_SDP_NEG_STATE_DONE) {
pjsip_tx_data *tdata;
/*
* SDP negotiation failed on an incoming call that delayed
* negotiation and then gave us an invalid SDP answer. We
* need to send a BYE to end the call because of the invalid
* SDP answer.
*/
ast_debug(1,
"Endpoint '%s(%s)': Ending session due to incomplete SDP negotiation. %s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_rx_data_get_info(rdata));
if (pjsip_inv_end_session(inv, 400, NULL, &tdata) == PJ_SUCCESS
&& tdata) {
ast_sip_session_send_request(session, tdata);
}
}
}
static void session_inv_on_state_changed(pjsip_inv_session *inv, pjsip_event *e)
{
struct ast_sip_session *session = inv->mod_data[session_module.id];
pjsip_event_id_e type;
if (e) {
print_debug_details(inv, NULL, e);
type = e->type;
} else {
type = PJSIP_EVENT_UNKNOWN;
}
if (!session) {
return;
}
switch(type) {
case PJSIP_EVENT_TX_MSG:
break;
case PJSIP_EVENT_RX_MSG:
handle_incoming_before_media(inv, session, e->body.rx_msg.rdata);
break;
case PJSIP_EVENT_TSX_STATE:
ast_debug(3, "Source of transaction state change is %s\n", pjsip_event_str(e->body.tsx_state.type));
/* Transaction state changes are prompted by some other underlying event. */
switch(e->body.tsx_state.type) {
case PJSIP_EVENT_TX_MSG:
break;
case PJSIP_EVENT_RX_MSG:
if (!check_request_status(inv, e)) {
handle_incoming_before_media(inv, session, e->body.tsx_state.src.rdata);
}
break;
case PJSIP_EVENT_TRANSPORT_ERROR:
case PJSIP_EVENT_TIMER:
/*
* Check the request status on transport error or timeout. A transport
* error can occur when a TCP socket closes and that can be the result
* of a 503. Also we may need to failover on a timeout (408).
*/
check_request_status(inv, e);
break;
case PJSIP_EVENT_USER:
case PJSIP_EVENT_UNKNOWN:
case PJSIP_EVENT_TSX_STATE:
/* Inception? */
break;
}
break;
case PJSIP_EVENT_TRANSPORT_ERROR:
case PJSIP_EVENT_TIMER:
case PJSIP_EVENT_UNKNOWN:
case PJSIP_EVENT_USER:
default:
break;
}
if (inv->state == PJSIP_INV_STATE_DISCONNECTED) {
if (ast_sip_push_task(session->serializer, session_end, session)) {
/* Do it anyway even though this is not the right thread. */
session_end(session);
}
}
}
static void session_inv_on_new_session(pjsip_inv_session *inv, pjsip_event *e)
{
/* XXX STUB */
}
static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_transaction *tsx, pjsip_event *e)
{
ast_sip_session_response_cb cb;
int id = session_module.id;
struct ast_sip_session *session;
pjsip_tx_data *tdata;
/*
* A race condition exists at shutdown where the res_pjsip_session can be
* unloaded but this callback may still get called afterwards. In this case
* the id may end up being -1 which is useless to us. To work around this
* we store the current value and check/use it.
*/
if (id < 0) {
return;
}
session = inv->mod_data[id];
print_debug_details(inv, tsx, e);
if (!session) {
/* The session has ended. Ignore the transaction change. */
return;
}
switch (e->body.tsx_state.type) {
case PJSIP_EVENT_TX_MSG:
/* When we create an outgoing request, we do not have access to the transaction that
* is created. Instead, We have to place transaction-specific data in the tdata. Here,
* we transfer the data into the transaction. This way, when we receive a response, we
* can dig this data out again
*/
tsx->mod_data[id] = e->body.tsx_state.src.tdata->mod_data[id];
break;
case PJSIP_EVENT_RX_MSG:
cb = ast_sip_mod_data_get(tsx->mod_data, id, MOD_DATA_ON_RESPONSE);
/* As the PJSIP invite session implementation responds with a 200 OK before we have a
* chance to be invoked session supplements for BYE requests actually end up executing
* in the invite session state callback as well. To prevent session supplements from
* running on the BYE request again we explicitly squash invocation of them here.
*/
if ((e->body.tsx_state.src.rdata->msg_info.msg->type != PJSIP_REQUEST_MSG) ||
(tsx->method.id != PJSIP_BYE_METHOD)) {
handle_incoming(session, e->body.tsx_state.src.rdata,
AST_SIP_SESSION_AFTER_MEDIA);
}
if (tsx->method.id == PJSIP_INVITE_METHOD) {
if (tsx->role == PJSIP_ROLE_UAC) {
if (tsx->state == PJSIP_TSX_STATE_COMPLETED) {
/* This means we got a non 2XX final response to our outgoing INVITE */
if (tsx->status_code == PJSIP_SC_REQUEST_PENDING) {
reschedule_reinvite(session, cb);
return;
}
if (inv->state == PJSIP_INV_STATE_CONFIRMED) {
ast_debug(1, "reINVITE received final response code %d\n",
tsx->status_code);
if ((tsx->status_code == 401 || tsx->status_code == 407)
&& !ast_sip_create_request_with_auth(
&session->endpoint->outbound_auths,
e->body.tsx_state.src.rdata, tsx->last_tx, &tdata)) {
/* Send authed reINVITE */
ast_sip_session_send_request_with_cb(session, tdata, cb);
return;
}
if (tsx->status_code != 488) {
/* Other reinvite failures (except 488) result in destroying the session. */
if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS
&& tdata) {
ast_sip_session_send_request(session, tdata);
}
}
}
} else if (tsx->state == PJSIP_TSX_STATE_TERMINATED) {
if (inv->cancelling && tsx->status_code == PJSIP_SC_OK) {
int sdp_negotiation_done =
pjmedia_sdp_neg_get_state(inv->neg) == PJMEDIA_SDP_NEG_STATE_DONE;
/*
* We can get here for the following reasons.
*
* 1) The race condition detailed in RFC5407 section 3.1.2.
* We sent a CANCEL at the same time that the UAS sent us a
* 200 OK with a valid SDP for the original INVITE. As a
* result, we have now received a 200 OK for a cancelled
* call and the SDP negotiation is complete. We need to
* immediately send a BYE to end the dialog.
*
* 2) We sent a CANCEL and hit the race condition but the
* UAS sent us an invalid SDP with the 200 OK. In this case
* the SDP negotiation is incomplete and PJPROJECT has
* already sent the BYE for us because of the invalid SDP.
*
* 3) We didn't send a CANCEL but the UAS sent us an invalid
* SDP with the 200 OK. In this case the SDP negotiation is
* incomplete and PJPROJECT has already sent the BYE for us
* because of the invalid SDP.
*/
ast_test_suite_event_notify("PJSIP_SESSION_CANCELED",
"Endpoint: %s\r\n"
"Channel: %s\r\n"
"Message: %s\r\n"
"SDP: %s",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_rx_data_get_info(e->body.tsx_state.src.rdata),
sdp_negotiation_done ? "complete" : "incomplete");
if (!sdp_negotiation_done) {
ast_debug(1, "Endpoint '%s(%s)': Incomplete SDP negotiation cancelled session. %s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_rx_data_get_info(e->body.tsx_state.src.rdata));
} else if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS
&& tdata) {
ast_debug(1, "Endpoint '%s(%s)': Ending session due to RFC5407 race condition. %s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_rx_data_get_info(e->body.tsx_state.src.rdata));
ast_sip_session_send_request(session, tdata);
}
}
}
}
} else {
/* All other methods */
if (tsx->role == PJSIP_ROLE_UAC) {
if (tsx->state == PJSIP_TSX_STATE_COMPLETED) {
/* This means we got a final response to our outgoing method */
ast_debug(1, "%.*s received final response code %d\n",
(int) pj_strlen(&tsx->method.name), pj_strbuf(&tsx->method.name),
tsx->status_code);
if ((tsx->status_code == 401 || tsx->status_code == 407)
&& !ast_sip_create_request_with_auth(
&session->endpoint->outbound_auths,
e->body.tsx_state.src.rdata, tsx->last_tx, &tdata)) {
/* Send authed version of the method */
ast_sip_session_send_request_with_cb(session, tdata, cb);
return;
}
}
}
}
if (cb) {
cb(session, e->body.tsx_state.src.rdata);
}
break;
case PJSIP_EVENT_TRANSPORT_ERROR:
if (inv->state == PJSIP_INV_STATE_DISCONNECTED) {
/*
* Clear the module data now to block session_inv_on_state_changed()
* from calling session_end() if it hasn't already done so.
*/
inv->mod_data[id] = NULL;
/*
* Pass the session ref held by session->inv_session to
* session_end_completion().
*/
if (session
&& ast_sip_push_task(session->serializer, session_end_completion, session)) {
/* Do it anyway even though this is not the right thread. */
session_end_completion(session);
}
return;
}
break;
case PJSIP_EVENT_TIMER:
/*
* The timer event is run by the pjsip monitor thread and not
* by the session serializer.
*/
if (inv->state == PJSIP_INV_STATE_DISCONNECTED) {
/*
* We are locking because ast_sip_dialog_get_session() needs
* the dialog locked to get the session by other threads.
*/
pjsip_dlg_inc_lock(inv->dlg);
session = inv->mod_data[id];
inv->mod_data[id] = NULL;
pjsip_dlg_dec_lock(inv->dlg);
/*
* Pass the session ref held by session->inv_session to
* session_end_completion().
*/
if (session
&& ast_sip_push_task(session->serializer, session_end_completion, session)) {
/* Do it anyway even though this is not the right thread. */
session_end_completion(session);
}
return;
}
break;
case PJSIP_EVENT_USER:
case PJSIP_EVENT_UNKNOWN:
case PJSIP_EVENT_TSX_STATE:
/* Inception? */
break;
}
if (AST_LIST_EMPTY(&session->delayed_requests)) {
/* No delayed request pending, so just return */
return;
}
if (tsx->method.id == PJSIP_INVITE_METHOD) {
if (tsx->state == PJSIP_TSX_STATE_PROCEEDING) {
ast_debug(3, "Endpoint '%s(%s)' INVITE delay check. tsx-state:%s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_tsx_state_str(tsx->state));
check_delayed_requests(session, invite_proceeding);
} else if (tsx->state == PJSIP_TSX_STATE_TERMINATED) {
/*
* Terminated INVITE transactions always should result in
* queuing delayed requests, no matter what event caused
* the transaction to terminate.
*/
ast_debug(3, "Endpoint '%s(%s)' INVITE delay check. tsx-state:%s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_tsx_state_str(tsx->state));
check_delayed_requests(session, invite_terminated);
}
} else if (tsx->role == PJSIP_ROLE_UAC
&& tsx->state == PJSIP_TSX_STATE_COMPLETED
&& !pj_strcmp2(&tsx->method.name, "UPDATE")) {
ast_debug(3, "Endpoint '%s(%s)' UPDATE delay check. tsx-state:%s\n",
ast_sorcery_object_get_id(session->endpoint),
session->channel ? ast_channel_name(session->channel) : "",
pjsip_tsx_state_str(tsx->state));
check_delayed_requests(session, update_completed);
}
}
static int add_sdp_streams(void *obj, void *arg, void *data, int flags)
{
struct ast_sip_session_media *session_media = obj;
pjmedia_sdp_session *answer = arg;
struct ast_sip_session *session = data;
struct ast_sip_session_sdp_handler *handler = session_media->handler;
RAII_VAR(struct sdp_handler_list *, handler_list, NULL, ao2_cleanup);
int res;
if (handler) {
/* if an already assigned handler reports a catastrophic error, fail */
res = handler->create_outgoing_sdp_stream(session, session_media, answer);
if (res < 0) {
return 0;
}
return CMP_MATCH;
}
handler_list = ao2_find(sdp_handlers, session_media->stream_type, OBJ_KEY);
if (!handler_list) {
return CMP_MATCH;
}
/* no handler for this stream type and we have a list to search */
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
if (handler == session_media->handler) {
continue;
}
res = handler->create_outgoing_sdp_stream(session, session_media, answer);
if (res < 0) {
/* catastrophic error */
return 0;
}
if (res > 0) {
/* Handled by this handler. Move to the next stream */
session_media_set_handler(session_media, handler);
return CMP_MATCH;
}
}
/* streams that weren't handled won't be included in generated outbound SDP */
return CMP_MATCH;
}
static struct pjmedia_sdp_session *create_local_sdp(pjsip_inv_session *inv, struct ast_sip_session *session, const pjmedia_sdp_session *offer)
{
RAII_VAR(struct ao2_iterator *, successful, NULL, ao2_iterator_cleanup);
static const pj_str_t STR_IN = { "IN", 2 };
static const pj_str_t STR_IP4 = { "IP4", 3 };
static const pj_str_t STR_IP6 = { "IP6", 3 };
pjmedia_sdp_session *local;
if (inv->state == PJSIP_INV_STATE_DISCONNECTED) {
ast_log(LOG_ERROR, "Failed to create session SDP. Session has been already disconnected\n");
return NULL;
}
if (!inv->pool_prov || !(local = PJ_POOL_ZALLOC_T(inv->pool_prov, pjmedia_sdp_session))) {
return NULL;
}
if (!offer) {
local->origin.version = local->origin.id = (pj_uint32_t)(ast_random());
} else {
local->origin.version = offer->origin.version + 1;
local->origin.id = offer->origin.id;
}
pj_strdup2(inv->pool_prov, &local->origin.user, session->endpoint->media.sdpowner);
pj_strdup2(inv->pool_prov, &local->name, session->endpoint->media.sdpsession);
/* Now let the handlers add streams of various types, pjmedia will automatically reorder the media streams for us */
successful = ao2_callback_data(session->media, OBJ_MULTIPLE, add_sdp_streams, local, session);
if (!successful || ao2_iterator_count(successful) != ao2_container_count(session->media)) {
/* Something experienced a catastrophic failure */
return NULL;
}
/* Use the connection details of the first media stream if possible for SDP level */
if (local->media_count) {
int stream;
/* Since we are using the first media stream as the SDP level we can get rid of it
* from the stream itself
*/
local->conn = local->media[0]->conn;
local->media[0]->conn = NULL;
pj_strassign(&local->origin.net_type, &local->conn->net_type);
pj_strassign(&local->origin.addr_type, &local->conn->addr_type);
pj_strassign(&local->origin.addr, &local->conn->addr);
/* Go through each media stream seeing if the connection details actually differ,
* if not just use SDP level and reduce the SDP size
*/
for (stream = 1; stream < local->media_count; stream++) {
if (!pj_strcmp(&local->conn->net_type, &local->media[stream]->conn->net_type) &&
!pj_strcmp(&local->conn->addr_type, &local->media[stream]->conn->addr_type) &&
!pj_strcmp(&local->conn->addr, &local->media[stream]->conn->addr)) {
local->media[stream]->conn = NULL;
}
}
} else {
local->origin.net_type = STR_IN;
local->origin.addr_type = session->endpoint->media.rtp.ipv6 ? STR_IP6 : STR_IP4;
if (!ast_strlen_zero(session->endpoint->media.address)) {
pj_strdup2(inv->pool_prov, &local->origin.addr, session->endpoint->media.address);
} else {
pj_strdup2(inv->pool_prov, &local->origin.addr, ast_sip_get_host_ip_string(session->endpoint->media.rtp.ipv6 ? pj_AF_INET6() : pj_AF_INET()));
}
}
return local;
}
static void session_inv_on_rx_offer(pjsip_inv_session *inv, const pjmedia_sdp_session *offer)
{
struct ast_sip_session *session = inv->mod_data[session_module.id];
pjmedia_sdp_session *answer;
if (handle_incoming_sdp(session, offer)) {
return;
}
if ((answer = create_local_sdp(inv, session, offer))) {
pjsip_inv_set_sdp_answer(inv, answer);
}
}
#if 0
static void session_inv_on_create_offer(pjsip_inv_session *inv, pjmedia_sdp_session **p_offer)
{
/* XXX STUB */
}
#endif
static void session_inv_on_media_update(pjsip_inv_session *inv, pj_status_t status)
{
struct ast_sip_session *session = inv->mod_data[session_module.id];
const pjmedia_sdp_session *local, *remote;
if (!session || !session->channel) {
/*
* If we don't have a session or channel then we really
* don't care about media updates.
* Just ignore
*/
return;
}
if ((status != PJ_SUCCESS) || (pjmedia_sdp_neg_get_active_local(inv->neg, &local) != PJ_SUCCESS) ||
(pjmedia_sdp_neg_get_active_remote(inv->neg, &remote) != PJ_SUCCESS)) {
ast_channel_hangupcause_set(session->channel, AST_CAUSE_BEARERCAPABILITY_NOTAVAIL);
ast_set_hangupsource(session->channel, ast_channel_name(session->channel), 0);
ast_queue_hangup(session->channel);
return;
}
handle_negotiated_sdp(session, local, remote);
}
static pjsip_redirect_op session_inv_on_redirected(pjsip_inv_session *inv, const pjsip_uri *target, const pjsip_event *e)
{
struct ast_sip_session *session = inv->mod_data[session_module.id];
const pjsip_sip_uri *uri;
if (!session->channel) {
return PJSIP_REDIRECT_STOP;
}
if (session->endpoint->redirect_method == AST_SIP_REDIRECT_URI_PJSIP) {
return PJSIP_REDIRECT_ACCEPT;
}
if (!PJSIP_URI_SCHEME_IS_SIP(target) && !PJSIP_URI_SCHEME_IS_SIPS(target)) {
return PJSIP_REDIRECT_STOP;
}
handle_incoming(session, e->body.rx_msg.rdata, AST_SIP_SESSION_BEFORE_REDIRECTING);
uri = pjsip_uri_get_uri(target);
if (session->endpoint->redirect_method == AST_SIP_REDIRECT_USER) {
char exten[AST_MAX_EXTENSION];
ast_copy_pj_str(exten, &uri->user, sizeof(exten));
/*
* We may want to match in the dialplan without any user
* options getting in the way.
*/
AST_SIP_USER_OPTIONS_TRUNCATE_CHECK(exten);
ast_channel_call_forward_set(session->channel, exten);
} else if (session->endpoint->redirect_method == AST_SIP_REDIRECT_URI_CORE) {
char target_uri[PJSIP_MAX_URL_SIZE];
/* PJSIP/ + endpoint length + / + max URL size */
char forward[8 + strlen(ast_sorcery_object_get_id(session->endpoint)) + PJSIP_MAX_URL_SIZE];
pjsip_uri_print(PJSIP_URI_IN_REQ_URI, uri, target_uri, sizeof(target_uri));
sprintf(forward, "PJSIP/%s/%s", ast_sorcery_object_get_id(session->endpoint), target_uri);
ast_channel_call_forward_set(session->channel, forward);
}
return PJSIP_REDIRECT_STOP;
}
static pjsip_inv_callback inv_callback = {
.on_state_changed = session_inv_on_state_changed,
.on_new_session = session_inv_on_new_session,
.on_tsx_state_changed = session_inv_on_tsx_state_changed,
.on_rx_offer = session_inv_on_rx_offer,
.on_media_update = session_inv_on_media_update,
.on_redirected = session_inv_on_redirected,
};
/*! \brief Hook for modifying outgoing messages with SDP to contain the proper address information */
static void session_outgoing_nat_hook(pjsip_tx_data *tdata, struct ast_sip_transport *transport)
{
RAII_VAR(struct ast_sip_transport_state *, transport_state, ast_sip_get_transport_state(ast_sorcery_object_get_id(transport)), ao2_cleanup);
struct ast_sip_nat_hook *hook = ast_sip_mod_data_get(
tdata->mod_data, session_module.id, MOD_DATA_NAT_HOOK);
struct pjmedia_sdp_session *sdp;
int stream;
/* SDP produced by us directly will never be multipart */
if (!transport_state || hook || !tdata->msg->body || pj_stricmp2(&tdata->msg->body->content_type.type, "application") ||
pj_stricmp2(&tdata->msg->body->content_type.subtype, "sdp") || ast_strlen_zero(transport->external_media_address)) {
return;
}
sdp = tdata->msg->body->data;
if (sdp->conn) {
char host[NI_MAXHOST];
struct ast_sockaddr addr = { { 0, } };
ast_copy_pj_str(host, &sdp->conn->addr, sizeof(host));
ast_sockaddr_parse(&addr, host, PARSE_PORT_FORBID);
if (!transport_state->localnet
|| (transport_state->localnet
&& ast_apply_ha(transport_state->localnet, &addr) == AST_SENSE_ALLOW)) {
ast_debug(5, "Setting external media address to %s\n", transport->external_media_address);
pj_strdup2(tdata->pool, &sdp->conn->addr, transport->external_media_address);
}
}
for (stream = 0; stream < sdp->media_count; ++stream) {
/* See if there are registered handlers for this media stream type */
char media[20];
struct ast_sip_session_sdp_handler *handler;
RAII_VAR(struct sdp_handler_list *, handler_list, NULL, ao2_cleanup);
/* We need a null-terminated version of the media string */
ast_copy_pj_str(media, &sdp->media[stream]->desc.media, sizeof(media));
handler_list = ao2_find(sdp_handlers, media, OBJ_KEY);
if (!handler_list) {
ast_debug(1, "No registered SDP handlers for media type '%s'\n", media);
continue;
}
AST_LIST_TRAVERSE(&handler_list->list, handler, next) {
if (handler->change_outgoing_sdp_stream_media_address) {
handler->change_outgoing_sdp_stream_media_address(tdata, sdp->media[stream], transport);
}
}
}
/* We purposely do this so that the hook will not be invoked multiple times, ie: if a retransmit occurs */
ast_sip_mod_data_set(tdata->pool, tdata->mod_data, session_module.id, MOD_DATA_NAT_HOOK, nat_hook);
}
static int load_module(void)
{
pjsip_endpoint *endpt;
CHECK_PJSIP_MODULE_LOADED();
if (!ast_sip_get_sorcery() || !ast_sip_get_pjsip_endpoint()) {
return AST_MODULE_LOAD_DECLINE;
}
if (!(nat_hook = ast_sorcery_alloc(ast_sip_get_sorcery(), "nat_hook", NULL))) {
return AST_MODULE_LOAD_DECLINE;
}
nat_hook->outgoing_external_message = session_outgoing_nat_hook;
ast_sorcery_create(ast_sip_get_sorcery(), nat_hook);
sdp_handlers = ao2_container_alloc(SDP_HANDLER_BUCKETS,
sdp_handler_list_hash, sdp_handler_list_cmp);
if (!sdp_handlers) {
return AST_MODULE_LOAD_DECLINE;
}
endpt = ast_sip_get_pjsip_endpoint();
pjsip_inv_usage_init(endpt, &inv_callback);
pjsip_100rel_init_module(endpt);
pjsip_timer_init_module(endpt);
if (ast_sip_register_service(&session_module)) {
return AST_MODULE_LOAD_DECLINE;
}
ast_sip_register_service(&session_reinvite_module);
ast_sip_register_service(&outbound_invite_auth_module);
ast_module_shutdown_ref(ast_module_info->self);
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_sip_unregister_service(&outbound_invite_auth_module);
ast_sip_unregister_service(&session_reinvite_module);
ast_sip_unregister_service(&session_module);
ast_sorcery_delete(ast_sip_get_sorcery(), nat_hook);
ao2_cleanup(nat_hook);
ao2_cleanup(sdp_handlers);
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "PJSIP Session resource",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
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