1999-07-07 00:34:58 +00:00
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/* packet-sdp.c
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2000-01-13 03:18:34 +00:00
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* Routines for SDP packet disassembly (RFC 2327)
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1999-07-07 00:34:58 +00:00
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*
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* Jason Lango <jal@netapp.com>
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2000-01-22 06:22:44 +00:00
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* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
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1999-07-07 00:34:58 +00:00
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*
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2000-09-11 16:16:13 +00:00
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* $Id: packet-sdp.c,v 1.10 2000/09/11 16:16:03 gram Exp $
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1999-07-07 00:34:58 +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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*
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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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*
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*/
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#include "config.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include <string.h>
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#include <ctype.h>
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#include <glib.h>
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#include "packet.h"
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2000-09-11 16:16:13 +00:00
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#include "strutil.h"
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1999-07-07 00:34:58 +00:00
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1999-07-29 05:47:07 +00:00
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static int proto_sdp = -1;
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1999-11-16 11:44:20 +00:00
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static int ett_sdp = -1;
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1999-07-07 00:34:58 +00:00
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void dissect_sdp(const u_char *pd, int offset, frame_data *fd,
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proto_tree *tree)
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{
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proto_tree *sdp_tree;
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proto_item *ti;
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const u_char *data, *dataend;
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const u_char *lineend, *eol;
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int linelen;
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u_char section;
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u_char type;
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const u_char *value;
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int valuelen;
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const char *typename;
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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_sdp, pd, offset, fd, tree);
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1999-07-07 00:34:58 +00:00
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data = &pd[offset];
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dataend = data + END_OF_FRAME;
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "SDP");
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if (check_col(fd, COL_INFO)) {
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/* XXX: Needs description. */
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col_add_str(fd, COL_INFO, "Session Description");
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}
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if (!tree)
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return;
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2000-05-31 05:09:07 +00:00
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ti = proto_tree_add_item(tree, proto_sdp, NullTVB, offset, END_OF_FRAME, FALSE);
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1999-11-16 11:44:20 +00:00
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sdp_tree = proto_item_add_subtree(ti, ett_sdp);
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1999-07-07 00:34:58 +00:00
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section = 0;
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for (; data < dataend; offset += linelen, data = lineend) {
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/*
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* Find the end of the line.
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*/
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lineend = find_line_end(data, dataend, &eol);
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linelen = lineend - data;
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/*
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* Line must contain at least e.g. "v=".
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*/
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if (linelen < 2)
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break;
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type = data[0];
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if (data[1] != '=') {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(sdp_tree, NullTVB, offset, linelen,
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1999-07-07 00:34:58 +00:00
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"Invalid line: %s",
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format_text(data, linelen));
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continue;
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}
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value = data + 2;
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valuelen = linelen - 2;
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/*
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* Attributes.
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*/
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switch (type) {
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case 'v':
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section = 'v';
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typename = "Session Description, version";
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break;
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case 'o':
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typename = "Owner/Creator, Session Id";
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break;
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case 's':
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typename = "Session Name";
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break;
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case 'i':
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if (section == 'v')
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typename = "Session Information";
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else if (section == 'm')
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typename = "Media Title";
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else
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typename = "Misplaced";
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break;
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case 'u':
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typename = "URI of Description";
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break;
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case 'e':
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typename = "E-mail Address";
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break;
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case 'p':
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typename = "Phone Number";
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break;
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case 'c':
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typename = "Connection Information";
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break;
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case 'b':
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typename = "Bandwidth Information";
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break;
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case 't':
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section = 't';
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typename = "Time Description, active time";
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break;
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case 'r':
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typename = "Repeat Time";
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break;
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case 'm':
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section = 'm';
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typename = "Media Description, name and address";
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break;
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case 'k':
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typename = "Encryption Key";
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break;
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case 'a':
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if (section == 'v')
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typename = "Session Attribute";
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else if (section == 'm')
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typename = "Media Attribute";
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else
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typename = "Misplaced";
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break;
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case 'z':
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typename = "Time Zone Adjustment";
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break;
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default:
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typename = "Unknown";
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break;
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}
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(sdp_tree, NullTVB, offset, linelen,
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1999-07-07 00:34:58 +00:00
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"%s (%c): %s", typename, type,
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format_text(value, valuelen));
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}
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if (data < dataend) {
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2000-05-11 08:18:09 +00:00
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proto_tree_add_text(sdp_tree, NullTVB, offset, END_OF_FRAME,
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1999-07-07 00:34:58 +00:00
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"Data (%d bytes)", END_OF_FRAME);
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}
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}
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1999-07-29 05:47:07 +00:00
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void
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proto_register_sdp(void)
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{
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/* static hf_register_info hf[] = {
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{ &variable,
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{ "Name", "sdp.abbreviation", TYPE, VALS_POINTER }},
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};*/
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1999-11-16 11:44:20 +00:00
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static gint *ett[] = {
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&ett_sdp,
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};
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1999-07-29 05:47:07 +00:00
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proto_sdp = proto_register_protocol("Session Description Protocol", "sdp");
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/* proto_register_field_array(proto_sdp, hf, array_length(hf));*/
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1999-11-16 11:44:20 +00:00
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proto_register_subtree_array(ett, array_length(ett));
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1999-07-29 05:47:07 +00:00
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}
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