69 lines
2.2 KiB
C
69 lines
2.2 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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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/* This module defines the network-specific handling of mobile-originated 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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/* 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 msgb *msg);
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/* Entrypoint - handler function common to all mobile-originated USSDs */
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int handle_rcv_ussd(struct msgb *msg)
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{
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char* ussd_text_rcvd = gsm0480_rcv_ussd(msg);
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if(ussd_text_rcvd[0] == 0xFF) /* Release-Complete */
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return 0;
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if(strstr(USSD_TEXT_OWN_NUMBER, ussd_text_rcvd) != NULL) {
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DEBUGP(DMM, "USSD: Own number requested\n");
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return send_own_number(msg);
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} else {
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DEBUGP(DMM, "Unhandled USSD %s\n", ussd_text_rcvd);
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return gsm0480_send_ussd_reject(msg);
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}
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}
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/* A network-specific handler function */
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static int send_own_number(struct msgb *msg)
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{
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char response_string[] = "Your extension is xxxxx\r"; /* Need trailing CR as EOT character */
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char* own_number = msg->lchan->subscr->extension;
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memcpy(response_string + 18, own_number, 5);
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return gsm0480_send_ussd_response(msg, response_string);
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}
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