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/* Network-specific handling of mobile-originated USSDs. */
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2008, 2009, 2010 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>
#include <openbsc/osmo_msc.h>
#include <osmocore/talloc.h>
#include <osmocom/vty/vty.h>
struct ussd_mapping {
struct llist_head entry;
const char *ussd_number;
uint8_t **l3_frames;
uint8_t *l3_sizes;
int frame_sizes;
};
LLIST_HEAD(mapping_list);
/* 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 ussd_request *req);
static int ussd_send_custom(struct gsm_subscriber_connection *, struct msgb *, struct ussd_request *);
/* Entrypoint - handler function common to all mobile-originated USSDs */
int handle_rcv_ussd(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
int rc;
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;
if (strstr(USSD_TEXT_OWN_NUMBER, req.text) != NULL) {
DEBUGP(DMM, "USSD: Own number requested\n");
rc = send_own_number(conn, msg, &req);
} else if (ussd_send_custom(conn, msg, &req)) {
LOGP(DMM, LOGL_NOTICE, "Sending custom L3 message for USSD.\n");
rc = 1;
} else {
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;
}
/* 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];
/* 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);
}
static int ussd_send_custom(struct gsm_subscriber_connection *conn,
struct msgb *msg, struct ussd_request *req)
{
struct msgb *out;
uint8_t* data;
struct ussd_mapping *map;
llist_for_each_entry(map, &mapping_list, entry) {
if (strstr(map->ussd_number, req->text) == NULL)
continue;
/* if we have more than one msg */
if (map->frame_sizes > 1) {
conn->ussd_sequence = 1;
conn->ussd_number = map->ussd_number;
}
out = gsm48_msgb_alloc();
if (!out)
return -1;
out->lchan = msg->lchan;
data = msgb_put(out, map->l3_sizes[0]);
memcpy(data, map->l3_frames[0], map->l3_sizes[0]);
gsm0808_submit_dtap(conn, out, 0, 0);
return 1;
}
return 0;
}
extern struct gsm_network *bsc_gsmnet;
int ussd_parse_mapping(const char *number, const uint8_t *msg, int len)
{
struct ussd_mapping *map;
llist_for_each_entry(map, &mapping_list, entry) {
if (strcmp(map->ussd_number, number) != 0)
continue;
LOGP(DINP, LOGL_ERROR, "NOT IMPLTELEMEND\n");
#if 0
map->l3_frames = talloc_realloc(map, map->l3_sizes, uint8_t,
map->l3_sizes = talloc_realloc;
map->l3_frames[map->frame_sizes] = talloc_array(map, uint8_t, len);
memcpy(map->l3_frames[map->frame_sizes], msg, len);
map->l3_sizes[map->frame_sizes] = len;
map->frame_sizes += 1;
#endif
return 0;
}
map = talloc_zero(bsc_gsmnet, struct ussd_mapping);
if (!map)
return -1;
llist_add(&map->entry, &mapping_list);
map->ussd_number = talloc_strdup(map, number);
map->l3_frames = talloc_array(map, uint8_t*, 1);
map->l3_sizes = talloc_array(map, uint8_t, 1);
map->l3_frames[0] = talloc_array(map, uint8_t, len);
memcpy(map->l3_frames[0], msg, len);
map->l3_sizes[0] = len;
map->frame_sizes += 1;
return 0;
}
int ussd_clear_mapping(const char *number)
{
struct ussd_mapping *map;
llist_for_each_entry(map, &mapping_list, entry) {
if (strcmp(map->ussd_number, number) == 0) {
llist_del(&map->entry);
talloc_free(map);
return 0;
}
}
return 0;
}
int ussd_call_reroute(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
struct ussd_mapping *map;
if (!conn->ussd_sequence)
return 0;
/* check if the rule is still there, compare number */
llist_for_each_entry(map, &mapping_list, entry) {
if (conn->ussd_number == map->ussd_number) {
return 1;
}
}
return -0;
}
int ussd_dump_mapping(struct vty *vty)
{
int i = 0;
struct ussd_mapping *map;
llist_for_each_entry(map, &mapping_list, entry) {
vty_out(vty, "USSD Nr: %s nr_frames: %d%s",
map->ussd_number, map->frame_sizes, VTY_NEWLINE);
for (i = 0; i < map->frame_sizes; ++i)
vty_out(vty, " %d: '%s'%s",
i, hexdump(map->l3_frames[i], map->l3_sizes[i]), VTY_NEWLINE);
}
return 0;
}
int ussd_call_rx(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
LOGP(DINP, LOGL_ERROR, "NOT IMPLTELEMEND\n");
return -1;
}
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