2010-09-29 11:32:55 +00:00
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/* USSD Filter Code */
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/*
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* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <openbsc/bsc_nat.h>
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#include <openbsc/bsc_nat_sccp.h>
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2010-10-11 08:07:37 +00:00
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#include <osmocore/protocol/gsm_08_08.h>
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#include <osmocore/gsm0480.h>
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#include <string.h>
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2010-09-29 11:32:55 +00:00
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int bsc_check_ussd(struct sccp_connections *con, struct bsc_nat_parsed *parsed,
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struct msgb *msg)
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{
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2010-10-11 08:07:37 +00:00
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uint32_t len;
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uint8_t msg_type;
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struct gsm48_hdr *hdr48;
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struct bsc_nat_acc_lst *lst;
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struct ussd_request req;
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/*
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* various checks to avoid the decoding work. Right now we only want to
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* decode if the connection was created for USSD, we do have a USSD access
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* list, a query, a IMSI and such...
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*/
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if (con->con_type != NAT_CON_TYPE_SSA)
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return 0;
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if (!con->imsi)
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return 0;
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if (!con->bsc->nat->ussd_lst_name)
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return 0;
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if (!con->bsc->nat->ussd_query)
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return 0;
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if (parsed->bssap != BSSAP_MSG_DTAP)
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return 0;
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if (strlen(con->imsi) > GSM_IMSI_LENGTH)
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return 0;
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hdr48 = bsc_unpack_dtap(parsed, msg, &len);
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if (!hdr48)
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return 0;
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msg_type = hdr48->msg_type & 0xbf;
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if (hdr48->proto_discr != GSM48_PDISC_NC_SS || msg_type != GSM0480_MTYPE_REGISTER)
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return 0;
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/* now check if it is a IMSI we care about */
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lst = bsc_nat_acc_lst_find(con->bsc->nat, con->bsc->nat->ussd_lst_name);
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if (!lst)
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return 0;
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if (bsc_nat_lst_check_allow(lst, con->imsi) != 0)
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return 0;
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/* now decode the message and see if we really want to handle it */
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memset(&req, 0, sizeof(req));
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if (gsm0480_decode_ussd_request(hdr48, len, &req) != 1)
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return 0;
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if (req.text[0] == 0xff)
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return 0;
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if (strcmp(req.text, con->bsc->nat->ussd_query) != 0)
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return 0;
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/* found a USSD query for our subscriber */
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LOGP(DNAT, LOGL_NOTICE, "Found USSD query for %s\n", con->imsi);
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return 1;
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2010-09-29 11:32:55 +00:00
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}
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