pjsip_session.c

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/*
 * 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);
 
void ast_sip_session_register_supplement_with_module(struct ast_module *module, 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);
 
    ast_assert(supplement != NULL);
 
    supplement->module = module;
 
    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);
    }
}
 
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);
            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;
}
 
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 ast_sip_session_supplement *copy = supplement_dup(iter);
 
        if (!copy) {
            return -1;
        }
 
        /* referenced session created. increasing module reference. */
        ast_module_ref(copy->module);
 
        AST_LIST_INSERT_TAIL(&session->supplements, 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))) {
        if (iter->module) {
            /* referenced session closed. decreasing module reference. */
            ast_module_unref(iter->module);
        }
 
        ast_free(iter);
    }
 
    return;
}