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/* hdr_check.c - Perform basic sanity checks on received packet.
*
* Copyright (C) 2010, Pawel Krawczyk <pawel.krawczyk@hush.com> and
* Jeroen Nijhof <jeroen@jeroennijhof.nl>
*
* 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 - see the file COPYING.
*
* See `CHANGES' file for revision history.
*/
#include "messages.h"
#include "libtac.h"
/* Checks given reply header for possible inconsistencies:
* 1. reply type other than expected
* 2. sequence number other than 2 or 4
* 3. session_id different from one sent in request
* Returns pointer to error message
* or NULL when the header seems to be correct
*/
char *_tac_check_header(HDR *th, int type) {
if(th->type != type) {
TACSYSLOG((LOG_ERR,\
"%s: unrelated reply, type %d, expected %d",\
__func__, th->type, type))
return protocol_err_msg;
} else if (1 == (th->seq_no % 2)) {
TACSYSLOG((LOG_ERR, "%s: not a reply - seq_no %d not even",\
__func__, th->seq_no))
return protocol_err_msg;
} /* else if(ntohl(th->session_id) != session_id) {
TACSYSLOG((LOG_ERR,\
"%s: unrelated reply, received session_id %d != sent %d",\
__func__, ntohl(th->session_id), session_id))
return protocol_err_msg;
} */
return NULL; /* header is ok */
} /* check header */
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