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/* Network-specific handling of mobile-originated USSDs. */
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009 by Mike Haben <michael.haben@btinternet.com>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* This module defines the network-specific handling of mobile-originated
USSD messages. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openbsc/gsm_04_80.h>
#include <openbsc/gsm_subscriber.h>
#include <openbsc/debug.h>
#include <openbsc/osmo_msc.h>
/* A network-specific handler function */
static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ussd_request *req)
{
char *own_number = conn->subscr->extension;
char response_string[GSM_EXTENSION_LENGTH + 20];
DEBUGP(DMM, "USSD: Own number requested\n");
/* Need trailing CR as EOT character */
snprintf(response_string, sizeof(response_string), "Your extension is %s", own_number);
return gsm0480_send_ussd_response(conn, msg, response_string, req);
}
/* A network-specific handler function */
static int send_own_imsi(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ussd_request *req)
{
char *own_imsi = conn->subscr->imsi;
char response_string[GSM_IMSI_LENGTH + 20];
DEBUGP(DMM, "USSD: Own IMSI requested\n");
/* Need trailing CR as EOT character */
snprintf(response_string, sizeof(response_string), "Your IMSI is %s", own_imsi);
return gsm0480_send_ussd_response(conn, msg, response_string, req);
}
static struct ussd_function {
char *request;
int (*response)(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ussd_request *req);
} ussd_function[] = {
{ "*#100#", send_own_number },
{ "*#101#", send_own_imsi },
{ NULL, NULL }
};
/* Entrypoint - handler function common to all mobile-originated USSDs */
int handle_rcv_ussd(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
int rc, i;
struct ussd_request req;
struct gsm48_hdr *gh;
memset(&req, 0, sizeof(req));
gh = msgb_l3(msg);
rc = gsm0480_decode_ussd_request(gh, msgb_l3len(msg), &req);
if (req.text[0] == 0xFF) /* Release-Complete */
return 0;
for (i = 0; ussd_function[i].request; i++) {
if (!strcmp(ussd_function[i].request, (const char *)req.text)) {
rc = ussd_function[i].response(conn, msg, &req);
break;
}
}
if (!ussd_function[i].request) {
DEBUGP(DMM, "Unhandled USSD %s\n", req.text);
rc = gsm0480_send_ussd_reject(conn, msg, &req);
}
/* check if we can release it */
msc_release_connection(conn);
return rc;
}
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