res_pjsip_dlg_options.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2015, Digium, Inc.
 *
 * Yaron Nahum <nachum.yaron@gmail.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>
    <depend>res_pjsip_session</depend>
    <support_level>core</support_level>
***/
 
#include "asterisk.h"
 
#include <pjsip.h>
#include <pjsip_ua.h>
#include <pjlib.h>
 
#include "asterisk/module.h"
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
 
#define DEFAULT_LANGUAGE "en"
#define DEFAULT_ENCODING "identity"
 
static int options_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
{
    pjsip_tx_data *tdata;
        pj_status_t status;
    const pjsip_hdr *hdr;
    pjsip_endpoint *endpt = ast_sip_get_pjsip_endpoint();
 
    status = pjsip_dlg_create_response(session->inv_session->dlg, rdata, 200, NULL,&tdata);
    if (status != PJ_SUCCESS) {
        ast_log(LOG_ERROR, "Unable to create response (%d)\n", status);
        return status;
    }
 
    /* Add appropriate headers */
    if ((hdr = pjsip_endpt_get_capability(endpt, PJSIP_H_ACCEPT, NULL))) {
        pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr*)pjsip_hdr_clone(tdata->pool, hdr));
    }
    if ((hdr = pjsip_endpt_get_capability(endpt, PJSIP_H_ALLOW, NULL))) {
        pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr*)pjsip_hdr_clone(tdata->pool, hdr));
    }
    if ((hdr = pjsip_endpt_get_capability(endpt, PJSIP_H_SUPPORTED, NULL))) {
        pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr*)pjsip_hdr_clone(tdata->pool, hdr));
    }
 
    /*
     * XXX TODO: pjsip doesn't care a lot about either of these headers -
     * while it provides specific methods to create them, they are defined
     * to be the standard string header creation. Hard coded here.
    */
    ast_sip_add_header(tdata, "Accept-Encoding", DEFAULT_ENCODING);
    ast_sip_add_header(tdata, "Accept-Language", DEFAULT_LANGUAGE);
 
    status = pjsip_dlg_send_response(session->inv_session->dlg, pjsip_rdata_get_tsx(rdata), tdata);
    if (status != PJ_SUCCESS) {
        ast_log(LOG_ERROR, "Unable to send response (%d)\n", status);
    }
 
    return status;
}
 
static struct ast_sip_session_supplement  dlg_options_supplement = {
    .method = "OPTIONS",
    .incoming_request = options_incoming_request,
};
 
static int load_module(void)
{
    ast_sip_session_register_supplement(&dlg_options_supplement);
 
    return AST_MODULE_LOAD_SUCCESS;
}
 
static int unload_module(void)
{
    ast_sip_session_unregister_supplement(&dlg_options_supplement);
    return 0;
}
 
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "SIP OPTIONS in dialog handler",
    .support_level = AST_MODULE_SUPPORT_CORE,
    .load = load_module,
    .unload = unload_module,
    .load_pri = AST_MODPRI_APP_DEPEND,
    .requires = "res_pjsip,res_pjsip_session",
);