| /* 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> |
| |
| /* 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(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req); |
| |
| |
| /* Entrypoint - handler function common to all mobile-originated USSDs */ |
| int handle_rcv_ussd(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| { |
| int rc; |
| struct ss_request req; |
| struct gsm48_hdr *gh; |
| |
| memset(&req, 0, sizeof(req)); |
| gh = msgb_l3(msg); |
| rc = gsm0480_decode_ss_request(gh, msgb_l3len(msg), &req); |
| if (!rc) { |
| DEBUGP(DMM, "Unhandled SS\n"); |
| rc = gsm0480_send_ussd_reject(conn, msg, &req); |
| msc_release_connection(conn); |
| return rc; |
| } |
| |
| /* Interrogation or releaseComplete? */ |
| if (req.ussd_text[0] == '\0' || req.ussd_text[0] == 0xFF) { |
| if (req.ss_code > 0) { |
| /* Assume interrogateSS or modification of it and reject */ |
| rc = gsm0480_send_ussd_reject(conn, msg, &req); |
| msc_release_connection(conn); |
| return rc; |
| } |
| /* Still assuming a Release-Complete and returning */ |
| return 0; |
| } |
| |
| if (!strcmp(USSD_TEXT_OWN_NUMBER, (const char *)req.ussd_text)) { |
| DEBUGP(DMM, "USSD: Own number requested\n"); |
| rc = send_own_number(conn, msg, &req); |
| } else { |
| DEBUGP(DMM, "Unhandled USSD %s\n", req.ussd_text); |
| rc = gsm0480_send_ussd_reject(conn, msg, &req); |
| } |
| |
| /* check if we can release it */ |
| msc_release_connection(conn); |
| return rc; |
| } |
| |
| /* A network-specific handler function */ |
| static int send_own_number(struct gsm_subscriber_connection *conn, const struct msgb *msg, const struct ss_request *req) |
| { |
| char *own_number = conn->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(conn, msg, response_string, req); |
| } |