diff options
Diffstat (limited to 'openbsc/src/ussd.c')
| -rw-r--r-- | openbsc/src/ussd.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/openbsc/src/ussd.c b/openbsc/src/ussd.c new file mode 100644 index 000000000..a3d11f080 --- /dev/null +++ b/openbsc/src/ussd.c @@ -0,0 +1,71 @@ +/* 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 General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +/* 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> + +/* Declarations of USSD strings to be recognised */ +const char USSD_TEXT_OWN_NUMBER[] = "*#100#"; + +/* Forward declarations of network-specific handler functions */ +static int send_own_number(const struct msgb *msg, const struct ussd_request *req); + + +/* Entrypoint - handler function common to all mobile-originated USSDs */ +int handle_rcv_ussd(struct msgb *msg) +{ + struct ussd_request req; + + gsm0480_decode_ussd_request(msg, &req); + if (req.text[0] == 0xFF) /* Release-Complete */ + return 0; + + if (strstr(USSD_TEXT_OWN_NUMBER, req.text) != NULL) { + DEBUGP(DMM, "USSD: Own number requested\n"); + return send_own_number(msg, &req); + } else { + DEBUGP(DMM, "Unhandled USSD %s\n", req.text); + return gsm0480_send_ussd_reject(msg, &req); + } +} + +/* A network-specific handler function */ +static int send_own_number(const struct msgb *msg, const struct ussd_request *req) +{ + char *own_number = msg->lchan->subscr->extension; + char response_string[GSM_EXTENSION_LENGTH + 20]; + + /* Need trailing CR as EOT character */ + snprintf(response_string, sizeof(response_string), "Your extension is %s\r", own_number); + return gsm0480_send_ussd_response(msg, response_string, req); +} |