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/* Network-specific handling of mobile-originated SSs. */
/* (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
SS messages. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openbsc/db.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);
static int change_ss_activation(struct gsm_subscriber_connection *conn, uint8_t activate, const struct ss_request *req);
static int interrogate_ss(struct gsm_subscriber_connection *conn, const struct ss_request *req);
/* Entrypoint - handler function common to all mobile-originated SS */
int handle_rcv_ss(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
int rc;
struct ss_request req;
struct gsm48_hdr *gh;
uint8_t activate;
memset(&req, 0, sizeof(req));
gh = msgb_l3(msg);
rc = gsm0480_decode_ss_request(gh, msgb_l3len(msg), &req);
if (rc == 1) {
switch (req.opcode) {
case GSM0480_OP_CODE_PROCESS_USS_REQ:
if (req.ussd_text[0] == 0xFF) /* Release-Complete */
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_ss_reject(conn, &req,
GSM_0480_PROBLEM_CODE_TAG_INVOKE,
GSM_0480_INVOKE_PROB_CODE_UNRECOGNISED_OPERATION);
}
break;
case GSM0480_OP_CODE_ACTIVATE_SS:
case GSM0480_OP_CODE_DEACTIVATE_SS:
activate = (req.opcode == GSM0480_OP_CODE_ACTIVATE_SS);
rc = change_ss_activation(conn, activate, &req);
break;
case GSM0480_OP_CODE_INTERROGATE_SS:
rc = interrogate_ss(conn, &req);
break;
default:
DEBUGP(DMM, "Unhandled SS opcode %d\n", req.opcode);
rc = gsm0480_send_ss_reject(conn, &req,
GSM_0480_PROBLEM_CODE_TAG_GENERAL,
GSM_0480_GEN_PROB_CODE_UNRECOGNISED);
break;
}
} else {
rc = gsm0480_send_ss_reject(conn, &req,
GSM_0480_PROBLEM_CODE_TAG_GENERAL,
GSM_0480_GEN_PROB_CODE_BAD_STRUCTURE);
}
/* 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, response_string, req);
}
static int change_ss_activation(struct gsm_subscriber_connection *conn, uint8_t activate, const struct ss_request *req)
{
struct msgb *msg;
uint8_t ss_status;
int rc = db_ss_interrogate_status(conn->subscr,
req->ss_code,
GSM0902_TS_CODE_TELEPHONY,
&ss_status);
if(rc < 0 || !(ss_status & GSM0902_SS_STATUS_P_BIT)) {
DEBUGP(DMM, "SS 0x%02X not provisioned\n", req->ss_code);
return gsm0480_send_ss_reject(conn, req,
GSM_0480_PROBLEM_CODE_TAG_INVOKE,
GSM_0480_INVOKE_PROB_CODE_UNRECOGNISED_OPERATION);
}
ss_status &= ~GSM0902_SS_STATUS_A_BIT;
ss_status |= (activate ? GSM0902_SS_STATUS_A_BIT : 0);
rc = db_ss_set_status(conn->subscr, req->ss_code,
GSM0902_TS_CODE_TELEPHONY, ss_status);
if(rc < 0)
return gsm0480_send_ss_reject(conn, req,
GSM_0480_PROBLEM_CODE_TAG_INVOKE,
GSM_0480_INVOKE_PROB_CODE_RESOURCE_LIMITATION);
msg = gsm48_msgb_alloc();
/* First put the payload into the message */
msgb_push_TLV1(msg, GSM0902_SS_DATA_SS_STATUS_TAG, ss_status);
/* Then wrap it as a Sequence of type SS-Data */
msgb_wrap_with_TL(msg, GSM0902_SS_INFO_SS_DATA_TAG);
return gsm0480_send_ss_return_result(conn, req, msg);
}
static int interrogate_ss(struct gsm_subscriber_connection *conn, const struct ss_request *req)
{
struct msgb *msg;
uint8_t ss_status;
int rc = db_ss_interrogate_status(conn->subscr,
req->ss_code,
GSM0902_TS_CODE_TELEPHONY,
&ss_status);
if(rc < 0 || !(ss_status & GSM0902_SS_STATUS_P_BIT)) {
DEBUGP(DMM, "SS 0x%02X not provisioned\n", req->ss_code);
return gsm0480_send_ss_reject(conn, req,
GSM_0480_PROBLEM_CODE_TAG_INVOKE,
GSM_0480_INVOKE_PROB_CODE_UNRECOGNISED_OPERATION);
}
msg = gsm48_msgb_alloc();
/* Put the payload into the message */
msgb_push_TLV1(msg, GSM0902_SS_INTERR_SS_RES_SS_STATUS_TAG, ss_status);
return gsm0480_send_ss_return_result(conn, req, msg);
}
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