105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* Network-specific handling of mobile-originated USSDs. */
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/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
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* (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2009 by Mike Haben <michael.haben@btinternet.com>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* This module defines the network-specific handling of mobile-originated
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USSD messages. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <osmocom/msc/gsm_04_80.h>
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#include <osmocom/msc/gsm_subscriber.h>
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#include <osmocom/msc/debug.h>
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#include <osmocom/msc/osmo_msc.h>
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#include <osmocom/msc/vlr.h>
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#include <osmocom/msc/gsm_04_08.h>
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/* Declarations of USSD strings to be recognised */
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const char USSD_TEXT_OWN_NUMBER[] = "*#100#";
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/* Forward declarations of network-specific handler functions */
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static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req);
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/* Entrypoint - handler function common to all mobile-originated USSDs */
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int handle_rcv_ussd(struct gsm_subscriber_connection *conn, struct msgb *msg)
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{
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int rc;
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struct ss_request req;
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struct gsm48_hdr *gh;
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/* TODO: Use subscriber_connection ref-counting if we ever want
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* to keep the connection alive due ot ongoing USSD exchange.
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* As we answer everytying synchronously so far, there's no need
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* yet */
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cm_service_request_concludes(conn, msg);
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memset(&req, 0, sizeof(req));
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gh = msgb_l3(msg);
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rc = gsm0480_decode_ss_request(gh, msgb_l3len(msg), &req);
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if (!rc) {
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DEBUGP(DMM, "Unhandled SS\n");
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rc = gsm0480_send_ussd_reject(conn, msg, &req);
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return rc;
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}
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/* Interrogation or releaseComplete? */
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if (req.ussd_text[0] == '\0' || req.ussd_text[0] == 0xFF) {
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if (req.ss_code > 0) {
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/* Assume interrogateSS or modification of it and reject */
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rc = gsm0480_send_ussd_reject(conn, msg, &req);
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return rc;
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}
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/* Still assuming a Release-Complete and returning */
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return 0;
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}
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msc_subscr_conn_communicating(conn);
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if (!strcmp(USSD_TEXT_OWN_NUMBER, (const char *)req.ussd_text)) {
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DEBUGP(DMM, "USSD: Own number requested\n");
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rc = send_own_number(conn, msg, &req);
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} else {
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DEBUGP(DMM, "Unhandled USSD %s\n", req.ussd_text);
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rc = gsm0480_send_ussd_reject(conn, msg, &req);
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}
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return rc;
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}
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/* A network-specific handler function */
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static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req)
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{
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char *own_number = conn->vsub->msisdn;
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char response_string[GSM_EXTENSION_LENGTH + 20];
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DEBUGP(DMM, "%s: MSISDN = %s\n", vlr_subscr_name(conn->vsub),
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own_number);
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/* Need trailing CR as EOT character */
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snprintf(response_string, sizeof(response_string), "Your extension is %s\r", own_number);
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return gsm0480_send_ussd_response(conn, msg, response_string, req);
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}
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