2001-04-01 04:50:42 +00:00
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/* packet_info.c
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* Routines for handling packet information
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*
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Have a flag in the "packet_info" structure, which indicates whether the
stuff currently being dissected is part of a packet included in an error
packet (e.g., an ICMP Unreachable packet). Have the TCP dissector not
bother doing reassembly if the TCP segment is part of an error packet,
rather than an actual TCP transmission; other dissectors might want to
treat those packets specially as well.
Add to the "tcpinfo" structure a flag indicating whether the URG flag
was set, rather than having the zero or non-zero value of the urgent
pointer indicate that. (Yes, at least as I read RFC 793, a zero urgent
pointer value isn't useful, as it means "the stuff before this segment
is urgent", but it's certainly possible to put onto the wire a TCP
segment with URG set and a zero urgent pointer.)
Don't dissect the TCP header by grabbing the entire header with
"tvb_memcpy()" and then pulling stuff out of it - extract stuff with
individual tvbuff calls, and put stuff into the protocol tree and the
Info column as we extract it, so that we can dissect a partial header.
This lets us, for example, get the source and destination ports from the
TCP header of the part of a TCP segment included in a minimum-length
ICMPv4 error packet.
svn path=/trunk/; revision=3986
2001-10-01 08:29:37 +00:00
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* $Id: packet_info.c,v 1.3 2001/10/01 08:29:37 guy Exp $
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2001-04-01 04:50:42 +00:00
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*
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* Ethereal - Network traffic analyzer
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2001-08-04 04:04:35 +00:00
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* By Gerald Combs <gerald@ethereal.com>
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2001-04-01 04:50:42 +00:00
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include "packet_info.h"
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void blank_packetinfo(void)
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{
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pi.dl_src.type = AT_NONE;
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pi.dl_dst.type = AT_NONE;
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pi.net_src.type = AT_NONE;
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pi.net_dst.type = AT_NONE;
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pi.src.type = AT_NONE;
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pi.dst.type = AT_NONE;
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pi.ethertype = 0;
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pi.ipproto = 0;
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Have a flag in the "packet_info" structure, which indicates whether the
stuff currently being dissected is part of a packet included in an error
packet (e.g., an ICMP Unreachable packet). Have the TCP dissector not
bother doing reassembly if the TCP segment is part of an error packet,
rather than an actual TCP transmission; other dissectors might want to
treat those packets specially as well.
Add to the "tcpinfo" structure a flag indicating whether the URG flag
was set, rather than having the zero or non-zero value of the urgent
pointer indicate that. (Yes, at least as I read RFC 793, a zero urgent
pointer value isn't useful, as it means "the stuff before this segment
is urgent", but it's certainly possible to put onto the wire a TCP
segment with URG set and a zero urgent pointer.)
Don't dissect the TCP header by grabbing the entire header with
"tvb_memcpy()" and then pulling stuff out of it - extract stuff with
individual tvbuff calls, and put stuff into the protocol tree and the
Info column as we extract it, so that we can dissect a partial header.
This lets us, for example, get the source and destination ports from the
TCP header of the part of a TCP segment included in a minimum-length
ICMPv4 error packet.
svn path=/trunk/; revision=3986
2001-10-01 08:29:37 +00:00
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pi.ipxptype = 0;
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pi.in_error_pkt = FALSE;
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2001-04-01 04:50:42 +00:00
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pi.ptype = PT_NONE;
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pi.srcport = 0;
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pi.destport = 0;
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pi.current_proto = "<Missing Protocol Name>";
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pi.p2p_dir = P2P_DIR_UNKNOWN;
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2001-08-04 04:04:35 +00:00
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pi.private = NULL;
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2001-04-01 04:50:42 +00:00
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}
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