You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
asterisk/res/res_pjsip/pjsip_session.c

167 lines
4.6 KiB

/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2017, CFWare, LLC
*
* Corey Farrell <git@cfware.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.
*/
#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 "include/res_pjsip_private.h"
#include "asterisk/linkedlists.h"
#include "asterisk/lock.h"
#include "asterisk/module.h"
AST_RWLIST_HEAD_STATIC(session_supplements, ast_sip_session_supplement);
/* This structure is used to support module references without
* breaking the ABI of the public struct ast_sip_session_supplement. */
struct private_sip_session_supplement {
/*! \brief This will be added to the session_supplements list.
*
* This field must be at offset 0 to enable retrieval of this
* structure from session_supplements.
*/
struct ast_sip_session_supplement copy;
/*! Users of this session supplement will hold a reference to the module. */
struct ast_module *module;
/*! Pointer to the static variable for unregister comparisons. */
struct ast_sip_session_supplement *original;
};
void ast_sip_session_register_supplement_with_module(struct ast_module *module, struct ast_sip_session_supplement *supplement)
{
struct ast_sip_session_supplement *iter;
struct private_sip_session_supplement *priv;
int inserted = 0;
SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);
ast_assert(supplement != NULL);
if (!supplement->response_priority) {
supplement->response_priority = AST_SIP_SESSION_BEFORE_MEDIA;
}
priv = ast_calloc(1, sizeof(*priv));
if (!priv) {
/* Really can't do anything here, just assert and return. */
ast_assert(priv != NULL);
return;
}
priv->copy = *supplement;
priv->module = module;
priv->original = supplement;
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
if (iter->priority > supplement->priority) {
AST_RWLIST_INSERT_BEFORE_CURRENT(&priv->copy, next);
inserted = 1;
break;
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
if (!inserted) {
AST_RWLIST_INSERT_TAIL(&session_supplements, &priv->copy, next);
}
}
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) {
struct private_sip_session_supplement *priv = (void*)iter;
if (supplement == priv->original) {
AST_RWLIST_REMOVE_CURRENT(next);
ast_free(priv);
break;
}
}
AST_RWLIST_TRAVERSE_SAFE_END;
}
static struct private_sip_session_supplement *supplement_dup(const struct private_sip_session_supplement *src)
{
struct private_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;
}
int ast_sip_session_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 private_sip_session_supplement *dup = supplement_dup((void*)iter);
if (!dup) {
return -1;
}
/* referenced session created. increasing module reference. */
ast_module_ref(dup->module);
AST_LIST_INSERT_TAIL(&session->supplements, &dup->copy, next);
}
return 0;
}
void ast_sip_session_remove_supplements(struct ast_sip_session *session)
{
struct ast_sip_session_supplement *iter;
if (!session) {
return;
}
/* free the supplements */
while ((iter = AST_LIST_REMOVE_HEAD(&session->supplements, next))) {
struct private_sip_session_supplement *priv = (void*)iter;
if (priv->module) {
/* referenced session closed. decreasing module reference. */
ast_module_unref(priv->module);
}
ast_free(iter);
}
return;
}
/* This stub is for ABI compatibility. */
#undef ast_sip_session_register_supplement
void ast_sip_session_register_supplement(struct ast_sip_session_supplement *supplement);
void ast_sip_session_register_supplement(struct ast_sip_session_supplement *supplement)
{
ast_sip_session_register_supplement_with_module(NULL, supplement);
}