When transfering to a URI without an extension, ensure that the s extension of the dialplan is entered ASTERISK-26869 #close Change-Id: I07403df66cf93f09e00a40ab5b41bfc6f72b1525
1207 lines
41 KiB
C
1207 lines
41 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<depend>res_pjsip_session</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/res_pjsip_session.h"
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#include "asterisk/module.h"
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#include "asterisk/pbx.h"
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#include "asterisk/taskprocessor.h"
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#include "asterisk/bridge.h"
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#include "asterisk/framehook.h"
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#include "asterisk/stasis_bridges.h"
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#include "asterisk/stasis_channels.h"
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#include "asterisk/causes.h"
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/*! \brief REFER Progress structure */
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struct refer_progress {
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/*! \brief Subscription to provide updates on */
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pjsip_evsub *sub;
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/*! \brief Dialog for subscription */
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pjsip_dialog *dlg;
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/*! \brief Received packet, used to construct final response in case no subscription exists */
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pjsip_rx_data *rdata;
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/*! \brief Frame hook for monitoring REFER progress */
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int framehook;
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/*! \brief Last received subclass in frame hook */
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int subclass;
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/*! \brief Serializer for notifications */
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struct ast_taskprocessor *serializer;
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/*! \brief Stasis subscription for bridge events */
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struct stasis_subscription *bridge_sub;
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/*! \brief Reference to transfer_channel_data related to the refer */
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struct transfer_channel_data *transfer_data;
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/*! \brief Uniqueid of transferee channel */
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char *transferee;
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/*! \brief Non-zero if the 100 notify has been sent */
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int sent_100;
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};
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/*! \brief REFER Progress notification structure */
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struct refer_progress_notification {
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/*! \brief Refer progress structure to send notification on */
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struct refer_progress *progress;
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/*! \brief SIP response code to send */
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int response;
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/*! \brief Subscription state */
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pjsip_evsub_state state;
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};
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/*! \brief REFER Progress module, used to attach REFER progress structure to subscriptions */
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static pjsip_module refer_progress_module = {
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.name = { "REFER Progress", 14 },
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.id = -1,
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};
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/*! \brief Destructor for REFER Progress notification structure */
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static void refer_progress_notification_destroy(void *obj)
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{
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struct refer_progress_notification *notification = obj;
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ao2_cleanup(notification->progress);
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}
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/*! \brief Allocator for REFER Progress notification structure */
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static struct refer_progress_notification *refer_progress_notification_alloc(struct refer_progress *progress, int response,
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pjsip_evsub_state state)
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{
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struct refer_progress_notification *notification = ao2_alloc(sizeof(*notification), refer_progress_notification_destroy);
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if (!notification) {
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return NULL;
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}
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ao2_ref(progress, +1);
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notification->progress = progress;
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notification->response = response;
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notification->state = state;
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return notification;
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}
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/*! \brief Serialized callback for subscription notification */
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static int refer_progress_notify(void *data)
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{
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RAII_VAR(struct refer_progress_notification *, notification, data, ao2_cleanup);
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pjsip_evsub *sub;
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pjsip_tx_data *tdata;
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/* If the subscription has already been terminated we can't send a notification */
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if (!(sub = notification->progress->sub)) {
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ast_debug(3, "Not sending NOTIFY of response '%d' and state '%u' on progress monitor '%p' as subscription has been terminated\n",
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notification->response, notification->state, notification->progress);
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return 0;
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}
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/* If the subscription is being terminated we want to actually remove the progress structure here to
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* stop a deadlock from occurring - basically terminated changes the state which queues a synchronous task
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* but we are already running a task... thus it would deadlock */
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if (notification->state == PJSIP_EVSUB_STATE_TERMINATED) {
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ast_debug(3, "Subscription '%p' is being terminated as a result of a NOTIFY, removing REFER progress structure early on progress monitor '%p'\n",
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notification->progress->sub, notification->progress);
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pjsip_dlg_inc_lock(notification->progress->dlg);
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pjsip_evsub_set_mod_data(notification->progress->sub, refer_progress_module.id, NULL);
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pjsip_dlg_dec_lock(notification->progress->dlg);
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/* This is for dropping the reference on the subscription */
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ao2_cleanup(notification->progress);
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notification->progress->sub = NULL;
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}
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/* Send a deferred initial 100 Trying SIP frag NOTIFY if we haven't already. */
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if (!notification->progress->sent_100) {
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notification->progress->sent_100 = 1;
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if (notification->response != 100) {
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ast_debug(3, "Sending initial 100 Trying NOTIFY for progress monitor '%p'\n",
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notification->progress);
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if (pjsip_xfer_notify(sub, PJSIP_EVSUB_STATE_ACTIVE, 100, NULL, &tdata) == PJ_SUCCESS) {
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pjsip_xfer_send_request(sub, tdata);
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}
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}
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}
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ast_debug(3, "Sending NOTIFY with response '%d' and state '%u' on subscription '%p' and progress monitor '%p'\n",
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notification->response, notification->state, sub, notification->progress);
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/* Actually send the notification */
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if (pjsip_xfer_notify(sub, notification->state, notification->response, NULL, &tdata) == PJ_SUCCESS) {
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pjsip_xfer_send_request(sub, tdata);
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}
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return 0;
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}
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static void refer_progress_bridge(void *data, struct stasis_subscription *sub,
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struct stasis_message *message)
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{
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struct refer_progress *progress = data;
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struct ast_bridge_blob *enter_blob;
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struct refer_progress_notification *notification;
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struct ast_channel *chan;
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if (stasis_subscription_final_message(sub, message)) {
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ao2_ref(progress, -1);
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return;
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}
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if (ast_channel_entered_bridge_type() != stasis_message_type(message)) {
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/* Don't care */
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return;
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}
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enter_blob = stasis_message_data(message);
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if (strcmp(enter_blob->channel->uniqueid, progress->transferee)) {
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/* Don't care */
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return;
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}
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if (!progress->transfer_data->completed) {
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/* We can't act on this message because the transfer_channel_data doesn't show that
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* the transfer is ready to progress */
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return;
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}
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/* OMG the transferee is joining a bridge. His call got answered! */
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notification = refer_progress_notification_alloc(progress, 200, PJSIP_EVSUB_STATE_TERMINATED);
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if (notification) {
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if (ast_sip_push_task(progress->serializer, refer_progress_notify, notification)) {
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ao2_cleanup(notification);
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}
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progress->bridge_sub = stasis_unsubscribe(progress->bridge_sub);
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}
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chan = ast_channel_get_by_name(progress->transferee);
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if (!chan) {
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/* The channel is already gone */
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return;
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}
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ast_channel_lock(chan);
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ast_debug(3, "Detaching REFER progress monitoring hook from '%s' as it has joined a bridge\n",
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ast_channel_name(chan));
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ast_framehook_detach(chan, progress->framehook);
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ast_channel_unlock(chan);
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ast_channel_unref(chan);
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}
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/*! \brief Progress monitoring frame hook - examines frames to determine state of transfer */
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static struct ast_frame *refer_progress_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data)
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{
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struct refer_progress *progress = data;
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struct refer_progress_notification *notification = NULL;
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/* We only care about frames *to* the channel */
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if (!f || (event != AST_FRAMEHOOK_EVENT_WRITE)) {
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return f;
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}
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/* If the completed flag hasn't been raised, skip this pass. */
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if (!progress->transfer_data->completed) {
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return f;
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}
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/* Determine the state of the REFER based on the control frames (or voice frames) passing */
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if (f->frametype == AST_FRAME_VOICE && !progress->subclass) {
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/* Media is passing without progress, this means the call has been answered */
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notification = refer_progress_notification_alloc(progress, 200, PJSIP_EVSUB_STATE_TERMINATED);
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} else if (f->frametype == AST_FRAME_CONTROL) {
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/* Based on the control frame being written we can send a NOTIFY advising of the progress */
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if ((f->subclass.integer == AST_CONTROL_RING) || (f->subclass.integer == AST_CONTROL_RINGING)) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 180, PJSIP_EVSUB_STATE_ACTIVE);
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} else if (f->subclass.integer == AST_CONTROL_BUSY) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 486, PJSIP_EVSUB_STATE_TERMINATED);
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} else if (f->subclass.integer == AST_CONTROL_CONGESTION) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 503, PJSIP_EVSUB_STATE_TERMINATED);
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} else if (f->subclass.integer == AST_CONTROL_PROGRESS) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 183, PJSIP_EVSUB_STATE_ACTIVE);
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} else if (f->subclass.integer == AST_CONTROL_PROCEEDING) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 100, PJSIP_EVSUB_STATE_ACTIVE);
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} else if (f->subclass.integer == AST_CONTROL_ANSWER) {
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progress->subclass = f->subclass.integer;
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notification = refer_progress_notification_alloc(progress, 200, PJSIP_EVSUB_STATE_TERMINATED);
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}
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}
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/* If a notification is due to be sent push it to the thread pool */
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if (notification) {
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/* If the subscription is being terminated we don't need the frame hook any longer */
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if (notification->state == PJSIP_EVSUB_STATE_TERMINATED) {
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ast_debug(3, "Detaching REFER progress monitoring hook from '%s' as subscription is being terminated\n",
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ast_channel_name(chan));
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ast_framehook_detach(chan, progress->framehook);
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}
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if (ast_sip_push_task(progress->serializer, refer_progress_notify, notification)) {
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ao2_cleanup(notification);
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}
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}
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return f;
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}
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/*! \brief Destroy callback for monitoring framehook */
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static void refer_progress_framehook_destroy(void *data)
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{
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struct refer_progress *progress = data;
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struct refer_progress_notification *notification = refer_progress_notification_alloc(progress, 503, PJSIP_EVSUB_STATE_TERMINATED);
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if (notification && ast_sip_push_task(progress->serializer, refer_progress_notify, notification)) {
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ao2_cleanup(notification);
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}
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if (progress->bridge_sub) {
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progress->bridge_sub = stasis_unsubscribe(progress->bridge_sub);
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}
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ao2_cleanup(progress);
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}
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/*! \brief Serialized callback for subscription termination */
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static int refer_progress_terminate(void *data)
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{
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struct refer_progress *progress = data;
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/* The subscription is no longer valid */
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progress->sub = NULL;
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return 0;
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}
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/*! \brief Callback for REFER subscription state changes */
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static void refer_progress_on_evsub_state(pjsip_evsub *sub, pjsip_event *event)
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{
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struct refer_progress *progress = pjsip_evsub_get_mod_data(sub, refer_progress_module.id);
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/* If being destroyed queue it up to the serializer */
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if (progress && (pjsip_evsub_get_state(sub) == PJSIP_EVSUB_STATE_TERMINATED)) {
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/* To prevent a deadlock race condition we unlock the dialog so other serialized tasks can execute */
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ast_debug(3, "Subscription '%p' has been remotely terminated, waiting for other tasks to complete on progress monitor '%p'\n",
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sub, progress);
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/* It's possible that a task is waiting to remove us already, so bump the refcount of progress so it doesn't get destroyed */
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ao2_ref(progress, +1);
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pjsip_dlg_dec_lock(progress->dlg);
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ast_sip_push_task_synchronous(progress->serializer, refer_progress_terminate, progress);
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pjsip_dlg_inc_lock(progress->dlg);
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ao2_ref(progress, -1);
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ast_debug(3, "Subscription '%p' removed from progress monitor '%p'\n", sub, progress);
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/* Since it was unlocked it is possible for this to have been removed already, so check again */
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if (pjsip_evsub_get_mod_data(sub, refer_progress_module.id)) {
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pjsip_evsub_set_mod_data(sub, refer_progress_module.id, NULL);
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ao2_cleanup(progress);
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}
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}
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}
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/*! \brief Callback structure for subscription */
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static pjsip_evsub_user refer_progress_evsub_cb = {
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.on_evsub_state = refer_progress_on_evsub_state,
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};
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/*! \brief Destructor for REFER progress sutrcture */
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static void refer_progress_destroy(void *obj)
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{
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struct refer_progress *progress = obj;
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if (progress->bridge_sub) {
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progress->bridge_sub = stasis_unsubscribe(progress->bridge_sub);
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}
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ao2_cleanup(progress->transfer_data);
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ast_free(progress->transferee);
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ast_taskprocessor_unreference(progress->serializer);
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}
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/*! \brief Internal helper function which sets up a refer progress structure if needed */
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static int refer_progress_alloc(struct ast_sip_session *session, pjsip_rx_data *rdata, struct refer_progress **progress)
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{
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const pj_str_t str_refer_sub = { "Refer-Sub", 9 };
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pjsip_generic_string_hdr *refer_sub = NULL;
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const pj_str_t str_true = { "true", 4 };
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pjsip_hdr hdr_list;
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char tps_name[AST_TASKPROCESSOR_MAX_NAME + 1];
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*progress = NULL;
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/* Grab the optional Refer-Sub header, it can be used to suppress the implicit subscription */
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refer_sub = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &str_refer_sub, NULL);
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if ((refer_sub && pj_strnicmp(&refer_sub->hvalue, &str_true, 4))) {
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return 0;
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}
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if (!(*progress = ao2_alloc(sizeof(struct refer_progress), refer_progress_destroy))) {
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return -1;
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}
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ast_debug(3, "Created progress monitor '%p' for transfer occurring from channel '%s' and endpoint '%s'\n",
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progress, ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
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(*progress)->framehook = -1;
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/* To prevent a potential deadlock we need the dialog so we can lock/unlock */
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(*progress)->dlg = session->inv_session->dlg;
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/* Create name with seq number appended. */
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ast_taskprocessor_build_name(tps_name, sizeof(tps_name), "pjsip/refer/%s",
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ast_sorcery_object_get_id(session->endpoint));
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if (!((*progress)->serializer = ast_sip_create_serializer(tps_name))) {
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goto error;
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}
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|
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/* Create the implicit subscription for monitoring of this transfer */
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if (pjsip_xfer_create_uas(session->inv_session->dlg, &refer_progress_evsub_cb, rdata, &(*progress)->sub) != PJ_SUCCESS) {
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goto error;
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}
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|
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/* Associate the REFER progress structure with the subscription */
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ao2_ref(*progress, +1);
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pjsip_evsub_set_mod_data((*progress)->sub, refer_progress_module.id, *progress);
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pj_list_init(&hdr_list);
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if (refer_sub) {
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pjsip_hdr *hdr = (pjsip_hdr*)pjsip_generic_string_hdr_create(session->inv_session->dlg->pool, &str_refer_sub, &str_true);
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pj_list_push_back(&hdr_list, hdr);
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}
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|
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/* Accept the REFER request */
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ast_debug(3, "Accepting REFER request for progress monitor '%p'\n", *progress);
|
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pjsip_xfer_accept((*progress)->sub, rdata, 202, &hdr_list);
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|
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return 0;
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error:
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ao2_cleanup(*progress);
|
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*progress = NULL;
|
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return -1;
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}
|
|
|
|
/*! \brief Structure for attended transfer task */
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|
struct refer_attended {
|
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/*! \brief Transferer session */
|
|
struct ast_sip_session *transferer;
|
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/*! \brief Transferer channel */
|
|
struct ast_channel *transferer_chan;
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|
/*! \brief Second transferer session */
|
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struct ast_sip_session *transferer_second;
|
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/*! \brief Optional refer progress structure */
|
|
struct refer_progress *progress;
|
|
};
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|
|
|
/*! \brief Destructor for attended transfer task */
|
|
static void refer_attended_destroy(void *obj)
|
|
{
|
|
struct refer_attended *attended = obj;
|
|
|
|
ao2_cleanup(attended->transferer);
|
|
ast_channel_cleanup(attended->transferer_chan);
|
|
ao2_cleanup(attended->transferer_second);
|
|
ao2_cleanup(attended->progress);
|
|
}
|
|
|
|
/*! \brief Allocator for attended transfer task */
|
|
static struct refer_attended *refer_attended_alloc(struct ast_sip_session *transferer,
|
|
struct ast_sip_session *transferer_second,
|
|
struct refer_progress *progress)
|
|
{
|
|
struct refer_attended *attended;
|
|
|
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attended = ao2_alloc_options(sizeof(*attended), refer_attended_destroy,
|
|
AO2_ALLOC_OPT_LOCK_NOLOCK);
|
|
if (!attended) {
|
|
return NULL;
|
|
}
|
|
|
|
ao2_ref(transferer, +1);
|
|
attended->transferer = transferer;
|
|
ast_channel_ref(transferer->channel);
|
|
attended->transferer_chan = transferer->channel;
|
|
ao2_ref(transferer_second, +1);
|
|
attended->transferer_second = transferer_second;
|
|
|
|
if (progress) {
|
|
ao2_ref(progress, +1);
|
|
attended->progress = progress;
|
|
}
|
|
|
|
return attended;
|
|
}
|
|
|
|
static int defer_termination_cancel(void *data)
|
|
{
|
|
struct ast_sip_session *session = data;
|
|
|
|
ast_sip_session_defer_termination_cancel(session);
|
|
ao2_ref(session, -1);
|
|
return 0;
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Convert transfer enum to SIP response code.
|
|
* \since 13.3.0
|
|
*
|
|
* \param xfer_code Core transfer function enum result.
|
|
*
|
|
* \return SIP response code
|
|
*/
|
|
static int xfer_response_code2sip(enum ast_transfer_result xfer_code)
|
|
{
|
|
int response;
|
|
|
|
response = 503;
|
|
switch (xfer_code) {
|
|
case AST_BRIDGE_TRANSFER_INVALID:
|
|
response = 400;
|
|
break;
|
|
case AST_BRIDGE_TRANSFER_NOT_PERMITTED:
|
|
response = 403;
|
|
break;
|
|
case AST_BRIDGE_TRANSFER_FAIL:
|
|
response = 500;
|
|
break;
|
|
case AST_BRIDGE_TRANSFER_SUCCESS:
|
|
response = 200;
|
|
break;
|
|
}
|
|
return response;
|
|
}
|
|
|
|
/*! \brief Task for attended transfer executed by attended->transferer_second serializer */
|
|
static int refer_attended_task(void *data)
|
|
{
|
|
struct refer_attended *attended = data;
|
|
int response;
|
|
|
|
if (attended->transferer_second->channel) {
|
|
ast_debug(3, "Performing a REFER attended transfer - Transferer #1: %s Transferer #2: %s\n",
|
|
ast_channel_name(attended->transferer_chan),
|
|
ast_channel_name(attended->transferer_second->channel));
|
|
|
|
response = xfer_response_code2sip(ast_bridge_transfer_attended(
|
|
attended->transferer_chan,
|
|
attended->transferer_second->channel));
|
|
|
|
ast_debug(3, "Final response for REFER attended transfer - Transferer #1: %s Transferer #2: %s is '%d'\n",
|
|
ast_channel_name(attended->transferer_chan),
|
|
ast_channel_name(attended->transferer_second->channel),
|
|
response);
|
|
} else {
|
|
ast_debug(3, "Received REFER request on channel '%s' but other channel has gone.\n",
|
|
ast_channel_name(attended->transferer_chan));
|
|
response = 603;
|
|
}
|
|
|
|
if (attended->progress) {
|
|
struct refer_progress_notification *notification;
|
|
|
|
notification = refer_progress_notification_alloc(attended->progress, response,
|
|
PJSIP_EVSUB_STATE_TERMINATED);
|
|
if (notification) {
|
|
refer_progress_notify(notification);
|
|
}
|
|
}
|
|
|
|
if (response != 200) {
|
|
if (!ast_sip_push_task(attended->transferer->serializer,
|
|
defer_termination_cancel, attended->transferer)) {
|
|
/* Gave the ref to the pushed task. */
|
|
attended->transferer = NULL;
|
|
}
|
|
}
|
|
|
|
ao2_ref(attended, -1);
|
|
return 0;
|
|
}
|
|
|
|
/*! \brief Structure for blind transfer callback details */
|
|
struct refer_blind {
|
|
/*! \brief Context being used for transfer */
|
|
const char *context;
|
|
/*! \brief Optional progress structure */
|
|
struct refer_progress *progress;
|
|
/*! \brief REFER message */
|
|
pjsip_rx_data *rdata;
|
|
/*! \brief Optional Replaces header */
|
|
pjsip_replaces_hdr *replaces;
|
|
/*! \brief Optional Refer-To header */
|
|
pjsip_sip_uri *refer_to;
|
|
};
|
|
|
|
/*! \brief Blind transfer callback function */
|
|
static void refer_blind_callback(struct ast_channel *chan, struct transfer_channel_data *user_data_wrapper,
|
|
enum ast_transfer_type transfer_type)
|
|
{
|
|
struct refer_blind *refer = user_data_wrapper->data;
|
|
pjsip_generic_string_hdr *referred_by;
|
|
|
|
static const pj_str_t str_referred_by = { "Referred-By", 11 };
|
|
static const pj_str_t str_referred_by_s = { "b", 1 };
|
|
|
|
pbx_builtin_setvar_helper(chan, "SIPTRANSFER", "yes");
|
|
|
|
/* If progress monitoring is being done attach a frame hook so we can monitor it */
|
|
if (refer->progress) {
|
|
struct ast_framehook_interface hook = {
|
|
.version = AST_FRAMEHOOK_INTERFACE_VERSION,
|
|
.event_cb = refer_progress_framehook,
|
|
.destroy_cb = refer_progress_framehook_destroy,
|
|
.data = refer->progress,
|
|
.disable_inheritance = 1,
|
|
};
|
|
|
|
refer->progress->transferee = ast_strdup(ast_channel_uniqueid(chan));
|
|
if (!refer->progress->transferee) {
|
|
struct refer_progress_notification *notification = refer_progress_notification_alloc(refer->progress, 200,
|
|
PJSIP_EVSUB_STATE_TERMINATED);
|
|
|
|
ast_log(LOG_WARNING, "Could not copy channel name '%s' during transfer - assuming success\n",
|
|
ast_channel_name(chan));
|
|
|
|
if (notification) {
|
|
refer_progress_notify(notification);
|
|
}
|
|
}
|
|
|
|
/* Progress needs a reference to the transfer_channel_data so that it can track the completed status of the transfer */
|
|
ao2_ref(user_data_wrapper, +1);
|
|
refer->progress->transfer_data = user_data_wrapper;
|
|
|
|
/* We need to bump the reference count up on the progress structure since it is in the frame hook now */
|
|
ao2_ref(refer->progress, +1);
|
|
|
|
/* If we can't attach a frame hook for whatever reason send a notification of success immediately */
|
|
ast_channel_lock(chan);
|
|
refer->progress->framehook = ast_framehook_attach(chan, &hook);
|
|
ast_channel_unlock(chan);
|
|
if (refer->progress->framehook < 0) {
|
|
struct refer_progress_notification *notification = refer_progress_notification_alloc(refer->progress, 200,
|
|
PJSIP_EVSUB_STATE_TERMINATED);
|
|
|
|
ast_log(LOG_WARNING, "Could not attach REFER transfer progress monitoring hook to channel '%s' - assuming success\n",
|
|
ast_channel_name(chan));
|
|
|
|
if (notification) {
|
|
refer_progress_notify(notification);
|
|
}
|
|
|
|
ao2_cleanup(refer->progress);
|
|
}
|
|
|
|
/* We need to bump the reference count for the stasis subscription */
|
|
ao2_ref(refer->progress, +1);
|
|
/* We also will need to detect if the transferee enters a bridge. This is currently the only reliable way to
|
|
* detect if the transfer target has answered the call
|
|
*/
|
|
refer->progress->bridge_sub = stasis_subscribe_pool(ast_bridge_topic_all(), refer_progress_bridge, refer->progress);
|
|
if (!refer->progress->bridge_sub) {
|
|
struct refer_progress_notification *notification = refer_progress_notification_alloc(refer->progress, 200,
|
|
PJSIP_EVSUB_STATE_TERMINATED);
|
|
|
|
ast_log(LOG_WARNING, "Could not create bridge stasis subscription for monitoring progress on transfer of channel '%s' - assuming success\n",
|
|
ast_channel_name(chan));
|
|
|
|
if (notification) {
|
|
refer_progress_notify(notification);
|
|
}
|
|
|
|
ast_channel_lock(chan);
|
|
ast_framehook_detach(chan, refer->progress->framehook);
|
|
ast_channel_unlock(chan);
|
|
|
|
ao2_cleanup(refer->progress);
|
|
}
|
|
}
|
|
|
|
pbx_builtin_setvar_helper(chan, "SIPREFERRINGCONTEXT", S_OR(refer->context, NULL));
|
|
|
|
referred_by = pjsip_msg_find_hdr_by_names(refer->rdata->msg_info.msg,
|
|
&str_referred_by, &str_referred_by_s, NULL);
|
|
if (referred_by) {
|
|
size_t uri_size = pj_strlen(&referred_by->hvalue) + 1;
|
|
char *uri = ast_alloca(uri_size);
|
|
|
|
ast_copy_pj_str(uri, &referred_by->hvalue, uri_size);
|
|
pbx_builtin_setvar_helper(chan, "__SIPREFERREDBYHDR", S_OR(uri, NULL));
|
|
} else {
|
|
pbx_builtin_setvar_helper(chan, "SIPREFERREDBYHDR", NULL);
|
|
}
|
|
|
|
if (refer->replaces) {
|
|
char replaces[512];
|
|
char *replaces_val = NULL;
|
|
int len;
|
|
|
|
len = pjsip_hdr_print_on(refer->replaces, replaces, sizeof(replaces) - 1);
|
|
if (len != -1) {
|
|
/* pjsip_hdr_print_on does not NULL terminate the buffer */
|
|
replaces[len] = '\0';
|
|
replaces_val = replaces + sizeof("Replaces:");
|
|
}
|
|
pbx_builtin_setvar_helper(chan, "__SIPREPLACESHDR", replaces_val);
|
|
} else {
|
|
pbx_builtin_setvar_helper(chan, "SIPREPLACESHDR", NULL);
|
|
}
|
|
|
|
if (refer->refer_to) {
|
|
char refer_to[PJSIP_MAX_URL_SIZE];
|
|
|
|
pjsip_uri_print(PJSIP_URI_IN_REQ_URI, refer->refer_to, refer_to, sizeof(refer_to));
|
|
pbx_builtin_setvar_helper(chan, "SIPREFERTOHDR", S_OR(refer_to, NULL));
|
|
} else {
|
|
pbx_builtin_setvar_helper(chan, "SIPREFERTOHDR", NULL);
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \internal
|
|
* \brief Set the passed in context variable to the determined transfer context.
|
|
* \since 13.3.0
|
|
*
|
|
* \param context Set to the determined transfer context.
|
|
* \param session INVITE dialog SIP session.
|
|
*/
|
|
#define DETERMINE_TRANSFER_CONTEXT(context, session) \
|
|
do { \
|
|
ast_channel_lock((session)->channel); \
|
|
context = pbx_builtin_getvar_helper((session)->channel, "TRANSFER_CONTEXT"); \
|
|
if (ast_strlen_zero(context)) { \
|
|
context = (session)->endpoint->context; \
|
|
} else { \
|
|
context = ast_strdupa(context); \
|
|
} \
|
|
ast_channel_unlock((session)->channel); \
|
|
} while (0) \
|
|
|
|
static int refer_incoming_attended_request(struct ast_sip_session *session, pjsip_rx_data *rdata, pjsip_sip_uri *target_uri,
|
|
pjsip_param *replaces_param, struct refer_progress *progress)
|
|
{
|
|
const pj_str_t str_replaces = { "Replaces", 8 };
|
|
pj_str_t replaces_content;
|
|
pjsip_replaces_hdr *replaces;
|
|
int parsed_len;
|
|
pjsip_dialog *dlg;
|
|
|
|
pj_strdup_with_null(rdata->tp_info.pool, &replaces_content, &replaces_param->value);
|
|
|
|
/* Parsing the parameter as a Replaces header easily grabs the needed information */
|
|
if (!(replaces = pjsip_parse_hdr(rdata->tp_info.pool, &str_replaces, replaces_content.ptr,
|
|
pj_strlen(&replaces_content), &parsed_len))) {
|
|
ast_log(LOG_ERROR, "Received REFER request on channel '%s' from endpoint '%s' with invalid Replaces header, rejecting\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 400;
|
|
}
|
|
|
|
/* See if the dialog is local, or remote */
|
|
if ((dlg = pjsip_ua_find_dialog(&replaces->call_id, &replaces->to_tag, &replaces->from_tag, PJ_TRUE))) {
|
|
RAII_VAR(struct ast_sip_session *, other_session, ast_sip_dialog_get_session(dlg), ao2_cleanup);
|
|
struct refer_attended *attended;
|
|
|
|
pjsip_dlg_dec_lock(dlg);
|
|
|
|
if (!other_session) {
|
|
ast_debug(3, "Received REFER request on channel '%s' from endpoint '%s' for local dialog but no session exists on it\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 603;
|
|
}
|
|
|
|
/* We defer actually doing the attended transfer to the other session so no deadlock can occur */
|
|
if (!(attended = refer_attended_alloc(session, other_session, progress))) {
|
|
ast_log(LOG_ERROR, "Received REFER request on channel '%s' from endpoint '%s' for local dialog but could not allocate structure to complete, rejecting\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 500;
|
|
}
|
|
|
|
if (ast_sip_session_defer_termination(session)) {
|
|
ast_log(LOG_ERROR, "Received REFER request on channel '%s' from endpoint '%s' for local dialog but could not defer termination, rejecting\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
ao2_cleanup(attended);
|
|
return 500;
|
|
}
|
|
|
|
/* Push it to the other session, which will have both channels with minimal locking */
|
|
if (ast_sip_push_task(other_session->serializer, refer_attended_task, attended)) {
|
|
ast_sip_session_defer_termination_cancel(session);
|
|
ao2_cleanup(attended);
|
|
return 500;
|
|
}
|
|
|
|
ast_debug(3, "Attended transfer from '%s' pushed to second channel serializer\n",
|
|
ast_channel_name(session->channel));
|
|
|
|
return 200;
|
|
} else {
|
|
const char *context;
|
|
struct refer_blind refer = { 0, };
|
|
int response;
|
|
|
|
DETERMINE_TRANSFER_CONTEXT(context, session);
|
|
|
|
if (!ast_exists_extension(NULL, context, "external_replaces", 1, NULL)) {
|
|
ast_log(LOG_ERROR, "Received REFER for remote session on channel '%s' from endpoint '%s' but 'external_replaces' extension not found in context %s\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint), context);
|
|
return 404;
|
|
}
|
|
|
|
refer.context = context;
|
|
refer.progress = progress;
|
|
refer.rdata = rdata;
|
|
refer.replaces = replaces;
|
|
refer.refer_to = target_uri;
|
|
|
|
if (ast_sip_session_defer_termination(session)) {
|
|
ast_log(LOG_ERROR, "Received REFER for remote session on channel '%s' from endpoint '%s' but could not defer termination, rejecting\n",
|
|
ast_channel_name(session->channel),
|
|
ast_sorcery_object_get_id(session->endpoint));
|
|
return 500;
|
|
}
|
|
|
|
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
|
|
"external_replaces", context, refer_blind_callback, &refer));
|
|
if (response != 200) {
|
|
ast_sip_session_defer_termination_cancel(session);
|
|
}
|
|
return response;
|
|
}
|
|
}
|
|
|
|
static int refer_incoming_blind_request(struct ast_sip_session *session, pjsip_rx_data *rdata, pjsip_sip_uri *target,
|
|
struct refer_progress *progress)
|
|
{
|
|
const char *context;
|
|
char exten[AST_MAX_EXTENSION];
|
|
struct refer_blind refer = { 0, };
|
|
int response;
|
|
|
|
/* If no explicit transfer context has been provided use their configured context */
|
|
DETERMINE_TRANSFER_CONTEXT(context, session);
|
|
|
|
/* Using the user portion of the target URI see if it exists as a valid extension in their context */
|
|
ast_copy_pj_str(exten, &target->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);
|
|
|
|
/* Uri without exten */
|
|
if (ast_strlen_zero(exten)) {
|
|
ast_copy_string(exten, "s", sizeof(exten));
|
|
ast_debug(3, "Channel '%s' from endpoint '%s' attempted blind transfer to a target without extension. Target was set to 's@%s'\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint), context);
|
|
}
|
|
|
|
if (!ast_exists_extension(NULL, context, exten, 1, NULL)) {
|
|
ast_log(LOG_ERROR, "Channel '%s' from endpoint '%s' attempted blind transfer to '%s@%s' but target does not exist\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint), exten, context);
|
|
return 404;
|
|
}
|
|
|
|
refer.context = context;
|
|
refer.progress = progress;
|
|
refer.rdata = rdata;
|
|
refer.refer_to = target;
|
|
|
|
if (ast_sip_session_defer_termination(session)) {
|
|
ast_log(LOG_ERROR, "Channel '%s' from endpoint '%s' attempted blind transfer but could not defer termination, rejecting\n",
|
|
ast_channel_name(session->channel),
|
|
ast_sorcery_object_get_id(session->endpoint));
|
|
return 500;
|
|
}
|
|
|
|
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
|
|
exten, context, refer_blind_callback, &refer));
|
|
if (response != 200) {
|
|
ast_sip_session_defer_termination_cancel(session);
|
|
}
|
|
return response;
|
|
}
|
|
|
|
/*! \brief Structure used to retrieve channel from another session */
|
|
struct invite_replaces {
|
|
/*! \brief Session we want the channel from */
|
|
struct ast_sip_session *session;
|
|
/*! \brief Channel from the session (with reference) */
|
|
struct ast_channel *channel;
|
|
/*! \brief Bridge the channel is in */
|
|
struct ast_bridge *bridge;
|
|
};
|
|
|
|
/*! \brief Task for invite replaces */
|
|
static int invite_replaces(void *data)
|
|
{
|
|
struct invite_replaces *invite = data;
|
|
|
|
if (!invite->session->channel) {
|
|
return -1;
|
|
}
|
|
|
|
ast_channel_ref(invite->session->channel);
|
|
invite->channel = invite->session->channel;
|
|
|
|
ast_channel_lock(invite->channel);
|
|
invite->bridge = ast_channel_get_bridge(invite->channel);
|
|
ast_channel_unlock(invite->channel);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int refer_incoming_invite_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
|
|
{
|
|
pjsip_dialog *other_dlg = NULL;
|
|
pjsip_tx_data *packet;
|
|
int response = 0;
|
|
RAII_VAR(struct ast_sip_session *, other_session, NULL, ao2_cleanup);
|
|
struct invite_replaces invite;
|
|
|
|
/* If a Replaces header is present make sure it is valid */
|
|
if (pjsip_replaces_verify_request(rdata, &other_dlg, PJ_TRUE, &packet) != PJ_SUCCESS) {
|
|
response = packet->msg->line.status.code;
|
|
ast_assert(response != 0);
|
|
pjsip_tx_data_dec_ref(packet);
|
|
goto inv_replace_failed;
|
|
}
|
|
|
|
/* If no other dialog exists then this INVITE request does not have a Replaces header */
|
|
if (!other_dlg) {
|
|
return 0;
|
|
}
|
|
|
|
other_session = ast_sip_dialog_get_session(other_dlg);
|
|
pjsip_dlg_dec_lock(other_dlg);
|
|
|
|
/* Don't accept an in-dialog INVITE with Replaces as it does not make much sense */
|
|
if (session->inv_session->dlg->state == PJSIP_DIALOG_STATE_ESTABLISHED) {
|
|
response = 488;
|
|
goto inv_replace_failed;
|
|
}
|
|
|
|
if (!other_session) {
|
|
ast_debug(3, "INVITE with Replaces received on channel '%s' from endpoint '%s', but requested session does not exist\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
response = 481;
|
|
goto inv_replace_failed;
|
|
}
|
|
|
|
invite.session = other_session;
|
|
|
|
if (ast_sip_push_task_synchronous(other_session->serializer, invite_replaces, &invite)) {
|
|
response = 481;
|
|
goto inv_replace_failed;
|
|
}
|
|
|
|
ast_channel_lock(session->channel);
|
|
ast_setstate(session->channel, AST_STATE_RING);
|
|
ast_channel_unlock(session->channel);
|
|
ast_raw_answer(session->channel);
|
|
|
|
ast_debug(3, "INVITE with Replaces being attempted. '%s' --> '%s'\n",
|
|
ast_channel_name(session->channel), ast_channel_name(invite.channel));
|
|
|
|
if (!invite.bridge) {
|
|
struct ast_channel *chan = session->channel;
|
|
|
|
/*
|
|
* This will use a synchronous task but we aren't operating in
|
|
* the serializer at this point in time, so it won't deadlock.
|
|
*/
|
|
if (!ast_channel_move(invite.channel, chan)) {
|
|
/*
|
|
* We can't directly use session->channel because ast_channel_move()
|
|
* does a masquerade which changes session->channel to a different
|
|
* channel. To ensure we work on the right channel we store a
|
|
* pointer locally before we begin so it remains valid.
|
|
*/
|
|
ast_hangup(chan);
|
|
} else {
|
|
response = AST_CAUSE_FAILURE;
|
|
}
|
|
} else {
|
|
if (ast_bridge_impart(invite.bridge, session->channel, invite.channel, NULL,
|
|
AST_BRIDGE_IMPART_CHAN_INDEPENDENT)) {
|
|
response = AST_CAUSE_FAILURE;
|
|
}
|
|
}
|
|
|
|
ast_channel_unref(invite.channel);
|
|
ao2_cleanup(invite.bridge);
|
|
|
|
if (!response) {
|
|
/*
|
|
* On success we cannot use session->channel in the debug message.
|
|
* This thread either no longer has a ref to session->channel or
|
|
* session->channel is no longer the original channel.
|
|
*/
|
|
ast_debug(3, "INVITE with Replaces successfully completed.\n");
|
|
} else {
|
|
ast_debug(3, "INVITE with Replaces failed on channel '%s', hanging up with cause '%d'\n",
|
|
ast_channel_name(session->channel), response);
|
|
ast_channel_lock(session->channel);
|
|
ast_channel_hangupcause_set(session->channel, response);
|
|
ast_channel_unlock(session->channel);
|
|
ast_hangup(session->channel);
|
|
}
|
|
|
|
return 1;
|
|
|
|
inv_replace_failed:
|
|
if (session->inv_session->dlg->state != PJSIP_DIALOG_STATE_ESTABLISHED) {
|
|
ast_debug(3, "INVITE with Replaces failed on channel '%s', sending response of '%d'\n",
|
|
ast_channel_name(session->channel), response);
|
|
session->defer_terminate = 1;
|
|
ast_hangup(session->channel);
|
|
|
|
if (pjsip_inv_end_session(session->inv_session, response, NULL, &packet) == PJ_SUCCESS
|
|
&& packet) {
|
|
ast_sip_session_send_response(session, packet);
|
|
}
|
|
} else {
|
|
ast_debug(3, "INVITE with Replaces in-dialog on channel '%s', hanging up\n",
|
|
ast_channel_name(session->channel));
|
|
ast_queue_hangup(session->channel);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int refer_incoming_refer_request(struct ast_sip_session *session, struct pjsip_rx_data *rdata)
|
|
{
|
|
pjsip_generic_string_hdr *refer_to;
|
|
char *uri;
|
|
size_t uri_size;
|
|
pjsip_uri *target;
|
|
pjsip_sip_uri *target_uri;
|
|
RAII_VAR(struct refer_progress *, progress, NULL, ao2_cleanup);
|
|
pjsip_param *replaces;
|
|
int response;
|
|
|
|
static const pj_str_t str_refer_to = { "Refer-To", 8 };
|
|
static const pj_str_t str_refer_to_s = { "r", 1 };
|
|
static const pj_str_t str_replaces = { "Replaces", 8 };
|
|
|
|
if (!session->channel) {
|
|
/* No channel to refer. Likely because the call was just hung up. */
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, 404, NULL, NULL, NULL);
|
|
ast_debug(3, "Received a REFER on a session with no channel from endpoint '%s'.\n",
|
|
ast_sorcery_object_get_id(session->endpoint));
|
|
return 0;
|
|
}
|
|
|
|
if (!session->endpoint->allowtransfer) {
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, 603, NULL, NULL, NULL);
|
|
ast_log(LOG_WARNING, "Endpoint %s transfer attempt blocked due to configuration\n",
|
|
ast_sorcery_object_get_id(session->endpoint));
|
|
return 0;
|
|
}
|
|
|
|
/* A Refer-To header is required */
|
|
refer_to = pjsip_msg_find_hdr_by_names(rdata->msg_info.msg, &str_refer_to, &str_refer_to_s, NULL);
|
|
if (!refer_to) {
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, 400, NULL, NULL, NULL);
|
|
ast_debug(3, "Received a REFER without Refer-To on channel '%s' from endpoint '%s'\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 0;
|
|
}
|
|
|
|
/* The ast_copy_pj_str to uri is needed because it puts the NULL terminator to the uri
|
|
* as pjsip_parse_uri require a NULL terminated uri
|
|
*/
|
|
|
|
uri_size = pj_strlen(&refer_to->hvalue) + 1;
|
|
uri = ast_alloca(uri_size);
|
|
ast_copy_pj_str(uri, &refer_to->hvalue, uri_size);
|
|
|
|
target = pjsip_parse_uri(rdata->tp_info.pool, uri, uri_size - 1, 0);
|
|
|
|
if (!target
|
|
|| (!PJSIP_URI_SCHEME_IS_SIP(target)
|
|
&& !PJSIP_URI_SCHEME_IS_SIPS(target))) {
|
|
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, 400, NULL, NULL, NULL);
|
|
ast_debug(3, "Received a REFER without a parseable Refer-To ('%s') on channel '%s' from endpoint '%s'\n",
|
|
uri, ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 0;
|
|
}
|
|
target_uri = pjsip_uri_get_uri(target);
|
|
|
|
/* Set up REFER progress subscription if requested/possible */
|
|
if (refer_progress_alloc(session, rdata, &progress)) {
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, 500, NULL, NULL, NULL);
|
|
ast_debug(3, "Could not set up subscription for REFER on channel '%s' from endpoint '%s'\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint));
|
|
return 0;
|
|
}
|
|
|
|
/* Determine if this is an attended or blind transfer */
|
|
if ((replaces = pjsip_param_find(&target_uri->header_param, &str_replaces)) ||
|
|
(replaces = pjsip_param_find(&target_uri->other_param, &str_replaces))) {
|
|
response = refer_incoming_attended_request(session, rdata, target_uri, replaces, progress);
|
|
} else {
|
|
response = refer_incoming_blind_request(session, rdata, target_uri, progress);
|
|
}
|
|
|
|
if (!progress) {
|
|
/* The transferer has requested no subscription, so send a final response immediately */
|
|
pjsip_tx_data *tdata;
|
|
const pj_str_t str_refer_sub = { "Refer-Sub", 9 };
|
|
const pj_str_t str_false = { "false", 5 };
|
|
pjsip_hdr *hdr;
|
|
|
|
ast_debug(3, "Progress monitoring not requested for REFER on channel '%s' from endpoint '%s', sending immediate response of '%d'\n",
|
|
ast_channel_name(session->channel), ast_sorcery_object_get_id(session->endpoint), response);
|
|
|
|
if (pjsip_dlg_create_response(session->inv_session->dlg, rdata, response, NULL, &tdata) != PJ_SUCCESS) {
|
|
pjsip_dlg_respond(session->inv_session->dlg, rdata, response, NULL, NULL, NULL);
|
|
return 0;
|
|
}
|
|
|
|
hdr = (pjsip_hdr*)pjsip_generic_string_hdr_create(tdata->pool, &str_refer_sub, &str_false);
|
|
pjsip_msg_add_hdr(tdata->msg, hdr);
|
|
|
|
pjsip_dlg_send_response(session->inv_session->dlg, pjsip_rdata_get_tsx(rdata), tdata);
|
|
} else if (response != 200) {
|
|
/* Since this failed we can send a final NOTIFY now and terminate the subscription */
|
|
struct refer_progress_notification *notification = refer_progress_notification_alloc(progress, response, PJSIP_EVSUB_STATE_TERMINATED);
|
|
|
|
if (notification) {
|
|
/* The refer_progress_notify function will call ao2_cleanup on this for us */
|
|
refer_progress_notify(notification);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int refer_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
|
|
{
|
|
if (!pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, pjsip_get_refer_method())) {
|
|
return refer_incoming_refer_request(session, rdata);
|
|
} else if (!pjsip_method_cmp(&rdata->msg_info.msg->line.req.method, &pjsip_invite_method)) {
|
|
return refer_incoming_invite_request(session, rdata);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
* \brief Use the value of a channel variable as the value of a SIP header
|
|
*
|
|
* This looks up a variable name on a channel, then takes that value and adds
|
|
* it to an outgoing SIP request. If the header already exists on the message,
|
|
* then no action is taken.
|
|
*
|
|
* \pre chan is locked.
|
|
*
|
|
* \param chan The channel on which to find the variable.
|
|
* \param var_name The name of the channel variable to use.
|
|
* \param header_name The name of the SIP header to add to the outgoing message.
|
|
* \param tdata The outgoing SIP message on which to add the header
|
|
*/
|
|
static void add_header_from_channel_var(struct ast_channel *chan, const char *var_name, const char *header_name, pjsip_tx_data *tdata)
|
|
{
|
|
const char *var_value;
|
|
pj_str_t pj_header_name;
|
|
pjsip_hdr *header;
|
|
|
|
var_value = pbx_builtin_getvar_helper(chan, var_name);
|
|
if (ast_strlen_zero(var_value)) {
|
|
return;
|
|
}
|
|
|
|
pj_cstr(&pj_header_name, header_name);
|
|
header = pjsip_msg_find_hdr_by_name(tdata->msg, &pj_header_name, NULL);
|
|
if (header) {
|
|
return;
|
|
}
|
|
ast_sip_add_header(tdata, header_name, var_value);
|
|
}
|
|
|
|
static void refer_outgoing_request(struct ast_sip_session *session, struct pjsip_tx_data *tdata)
|
|
{
|
|
if (pjsip_method_cmp(&tdata->msg->line.req.method, &pjsip_invite_method)
|
|
|| !session->channel
|
|
|| session->inv_session->state != PJSIP_INV_STATE_NULL) {
|
|
return;
|
|
}
|
|
|
|
ast_channel_lock(session->channel);
|
|
add_header_from_channel_var(session->channel, "SIPREPLACESHDR", "Replaces", tdata);
|
|
add_header_from_channel_var(session->channel, "SIPREFERREDBYHDR", "Referred-By", tdata);
|
|
ast_channel_unlock(session->channel);
|
|
}
|
|
|
|
static struct ast_sip_session_supplement refer_supplement = {
|
|
.priority = AST_SIP_SUPPLEMENT_PRIORITY_CHANNEL + 1,
|
|
.incoming_request = refer_incoming_request,
|
|
.outgoing_request = refer_outgoing_request,
|
|
};
|
|
|
|
static int load_module(void)
|
|
{
|
|
const pj_str_t str_norefersub = { "norefersub", 10 };
|
|
|
|
CHECK_PJSIP_SESSION_MODULE_LOADED();
|
|
|
|
pjsip_replaces_init_module(ast_sip_get_pjsip_endpoint());
|
|
pjsip_xfer_init_module(ast_sip_get_pjsip_endpoint());
|
|
pjsip_endpt_add_capability(ast_sip_get_pjsip_endpoint(), NULL, PJSIP_H_SUPPORTED, NULL, 1, &str_norefersub);
|
|
|
|
ast_sip_register_service(&refer_progress_module);
|
|
ast_sip_session_register_supplement(&refer_supplement);
|
|
|
|
return AST_MODULE_LOAD_SUCCESS;
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
ast_sip_session_unregister_supplement(&refer_supplement);
|
|
ast_sip_unregister_service(&refer_progress_module);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Blind and Attended Transfer Support",
|
|
.support_level = AST_MODULE_SUPPORT_CORE,
|
|
.load = load_module,
|
|
.unload = unload_module,
|
|
.load_pri = AST_MODPRI_APP_DEPEND,
|
|
);
|