2000-02-09 17:17:00 +00:00
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/* packet-time.c
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* Routines for time packet dissection
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*
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* Richard Sharpe <rsharpe@ns.aus.com>
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* Craig Newell <CraigN@cheque.uq.edu.au>
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* RFC2347 TIME Option Extension
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*
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Add the "Edit:Protocols..." feature which currently only implements
the following:
It is now possible to enable/disable a particular protocol decoding
(i.e. the protocol dissector is void or not). When a protocol
is disabled, it is displayed as Data and of course, all linked
sub-protocols are disabled as well.
Disabling a protocol could be interesting:
- in case of buggy dissectors
- in case of wrong heuristics
- for performance reasons
- to decode the data as another protocol (TODO)
Currently (if I am not wrong), all dissectors but NFS can be disabled
(and dissectors that do not register protocols :-)
I do not like the way the RPC sub-dissectors are disabled (in the
sub-dissectors) since this could be done in the RPC dissector itself,
knowing the sub-protocol hfinfo entry (this is why, I've not modified
the NFS one yet).
Two functions are added in proto.c :
gboolean proto_is_protocol_enabled(int n);
void proto_set_decoding(int n, gboolean enabled);
and two MACROs which can be used in dissectors:
OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree)
CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree)
See also the XXX in proto_dlg.c and proto.c around the new functions.
svn path=/trunk/; revision=2267
2000-08-13 14:09:15 +00:00
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* $Id: packet-time.c,v 1.8 2000/08/13 14:09:06 deniel Exp $
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2000-02-09 17:17:00 +00:00
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-tftp.c
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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 "packet.h"
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static int proto_time = -1;
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static int hf_time_time = -1;
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static gint ett_time = -1;
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2000-04-08 07:07:42 +00:00
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#define UDP_PORT_TIME 37
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static void
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2000-02-09 17:17:00 +00:00
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dissect_time(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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{
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proto_tree *time_tree;
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proto_item *ti;
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Add the "Edit:Protocols..." feature which currently only implements
the following:
It is now possible to enable/disable a particular protocol decoding
(i.e. the protocol dissector is void or not). When a protocol
is disabled, it is displayed as Data and of course, all linked
sub-protocols are disabled as well.
Disabling a protocol could be interesting:
- in case of buggy dissectors
- in case of wrong heuristics
- for performance reasons
- to decode the data as another protocol (TODO)
Currently (if I am not wrong), all dissectors but NFS can be disabled
(and dissectors that do not register protocols :-)
I do not like the way the RPC sub-dissectors are disabled (in the
sub-dissectors) since this could be done in the RPC dissector itself,
knowing the sub-protocol hfinfo entry (this is why, I've not modified
the NFS one yet).
Two functions are added in proto.c :
gboolean proto_is_protocol_enabled(int n);
void proto_set_decoding(int n, gboolean enabled);
and two MACROs which can be used in dissectors:
OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree)
CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree)
See also the XXX in proto_dlg.c and proto.c around the new functions.
svn path=/trunk/; revision=2267
2000-08-13 14:09:15 +00:00
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OLD_CHECK_DISPLAY_AS_DATA(proto_time, pd, offset, fd, tree);
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2000-02-09 17:17:00 +00:00
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "TIME");
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if (check_col(fd, COL_INFO)) {
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2000-04-08 07:07:42 +00:00
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col_add_fstr(fd, COL_INFO, "TIME %s", pi.srcport == UDP_PORT_TIME? "Response":"Request");
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2000-02-09 17:17:00 +00:00
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}
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if (tree) {
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2000-05-31 05:09:07 +00:00
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ti = proto_tree_add_item(tree, proto_time, NullTVB, offset, END_OF_FRAME, FALSE);
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2000-02-09 17:17:00 +00:00
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time_tree = proto_item_add_subtree(ti, ett_time);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(time_tree, NullTVB, offset, 0,
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2000-02-09 17:17:00 +00:00
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pi.srcport==37? "Type: Response":"Type: Request");
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if (pi.srcport == 37) {
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guint32 delta_seconds = pntohl(pd+offset);
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(time_tree, NullTVB, offset, 4,
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2000-03-06 20:04:53 +00:00
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" %u seconds since midnight 1 January 1900 GMT",
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2000-02-09 17:17:00 +00:00
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delta_seconds);
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}
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}
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}
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void
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proto_register_time(void)
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{
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static hf_register_info hf[] = {
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{ &hf_time_time,
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2000-03-20 22:52:48 +00:00
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{ "Time", "time.time",
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2000-02-09 17:17:00 +00:00
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Seconds since 00:00 (midnight) 1 January 1900 GMT" }}
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};
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static gint *ett[] = {
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&ett_time,
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};
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proto_time = proto_register_protocol("Time Protocol", "time");
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proto_register_field_array(proto_time, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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2000-04-08 07:07:42 +00:00
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void
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proto_reg_handoff_time(void)
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{
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Allow either old-style (pre-tvbuff) or new-style (tvbuffified)
dissectors to be registered as dissectors for particular ports,
registered as heuristic dissectors, and registered as dissectors for
conversations, and have routines to be used both by old-style and
new-style dissectors to call registered dissectors.
Have the code that calls those dissectors translate the arguments as
necessary. (For conversation dissectors, replace
"find_conversation_dissector()", which just returns a pointer to the
dissector, with "old_try_conversation_dissector()" and
"try_conversation_dissector()", which actually call the dissector, so
that there's a single place at which we can do that translation. Also
make "dissector_lookup()" static and, instead of calling it and, if it
returns a non-null pointer, calling that dissector, just use
"old_dissector_try_port()" or "dissector_try_port()", for the same
reason.)
This allows some dissectors that took old-style arguments and
immediately translated them to new-style arguments to just take
new-style arguments; make them do so. It also allows some new-style
dissectors not to have to translate arguments before calling routines to
look up and call dissectors; make them not do so.
Get rid of checks for too-short frames in new-style dissectors - the
tvbuff code does those checks for you.
Give the routines to register old-style dissectors, and to call
dissectors from old-style dissectors, names beginning with "old_", with
the routines for new-style dissectors not having the "old_". Update the
dissectors that use those routines appropriately.
Rename "dissect_data()" to "old_dissect_data()", and
"dissect_data_tvb()" to "dissect_data()".
svn path=/trunk/; revision=2218
2000-08-07 03:21:25 +00:00
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old_dissector_add("udp.port", UDP_PORT_TIME, dissect_time);
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2000-04-08 07:07:42 +00:00
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}
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