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