80 lines
2.7 KiB
C
80 lines
2.7 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 <openbsc/gsm_04_80.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/debug.h>
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#include <openbsc/osmo_msc.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 ussd_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 ussd_request req;
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struct gsm48_hdr *gh;
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memset(&req, 0, sizeof(req));
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gh = msgb_l3(msg);
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rc = gsm0480_decode_ussd_request(gh, msgb_l3len(msg), &req);
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if (req.text[0] == 0xFF) /* Release-Complete */
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return 0;
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if (strstr(USSD_TEXT_OWN_NUMBER, req.text) != NULL) {
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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.text);
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rc = gsm0480_send_ussd_reject(conn, msg, &req);
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}
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/* check if we can release it */
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msc_release_connection(conn);
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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 ussd_request *req)
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{
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char *own_number = conn->subscr->extension;
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char response_string[GSM_EXTENSION_LENGTH + 20];
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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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