32d63ecb30
statements. Move the setting of the Protocol column in various dissectors before anything is fetched from the packet, and also clear the Info column at that point in those and some other dissectors, so that if an exception is thrown, the columns don't reflect the previous protocol. "Tvbuffify" the Mobile IP dissector (it took old-style arguments, and then converted them into tvbuff arguments, so there wasn't much to do, other than to fix references to "fd" to refer to "pinfo->fd"). In the SCTP dissector, refer to the port type and source and destination ports through "pinfo" rather than through the global "pi", as it's a tvbuffified dissector. In the SMTP and Time Protocol dissectors, use "pinfo->match_port" rather than "TCP_PORT_SMTP" when checking whether the packet is a request or reply, just in case somebody makes a non-standard port be dissected as SMTP or Time. (Also, remove a bogus comment from the Time dissector; it was probably cut-and-pasted from the TFTP dissector.) svn path=/trunk/; revision=2938
228 lines
5.6 KiB
C
228 lines
5.6 KiB
C
/* packet-sdp.c
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* Routines for SDP packet disassembly (RFC 2327)
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*
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* Jason Lango <jal@netapp.com>
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* Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu>
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*
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* $Id: packet-sdp.c,v 1.20 2001/01/25 06:14:14 guy Exp $
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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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#include "strutil.h"
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static int proto_sdp = -1;
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static int ett_sdp = -1;
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static void
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dissect_sdp(tvbuff_t *tvb, packet_info *pinfo, 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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gint offset = 0;
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const u_char *line;
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gint next_offset;
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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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int datalen;
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/*
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* As RFC 2327 says, "SDP is purely a format for session
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* description - it does not incorporate a transport protocol,
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* and is intended to use different transport protocols as
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* appropriate including the Session Announcement Protocol,
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* Session Initiation Protocol, Real-Time Streaming Protocol,
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* electronic mail using the MIME extensions, and the
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* Hypertext Transport Protocol."
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*
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* We therefore don't set the protocol or info columns;
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* instead, we append to them, so that we don't erase
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* what the protocol inside which the SDP stuff resides
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* put there.
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*/
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if (check_col(pinfo->fd, COL_PROTOCOL))
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col_append_str(pinfo->fd, COL_PROTOCOL, "/SDP");
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if (check_col(pinfo->fd, COL_INFO)) {
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/* XXX: Needs description. */
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col_append_str(pinfo->fd, COL_INFO, ", with session description");
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}
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if (!tree)
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return;
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ti = proto_tree_add_item(tree, proto_sdp, tvb, offset,
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tvb_length_remaining(tvb, offset), FALSE);
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sdp_tree = proto_item_add_subtree(ti, ett_sdp);
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/*
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* Show the SDP message a line at a time.
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*/
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section = 0;
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while (tvb_offset_exists(tvb, offset)) {
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/*
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* Find the end of the line.
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*/
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linelen = tvb_find_line_end_unquoted(tvb, offset, -1,
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&next_offset);
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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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line = tvb_get_ptr(tvb, offset, next_offset - offset);
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type = line[0];
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if (line[1] != '=') {
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proto_tree_add_text(sdp_tree, tvb, offset,
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next_offset - offset,
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"Invalid line: %s",
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tvb_format_text(tvb, offset, next_offset - offset));
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offset = next_offset;
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continue;
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}
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value = line + 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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proto_tree_add_text(sdp_tree, tvb, offset,
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next_offset - offset,
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"%s (%c): %s", typename, type,
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format_text(value, valuelen));
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offset = next_offset;
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}
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datalen = tvb_length_remaining(tvb, offset);
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if (datalen > 0) {
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proto_tree_add_text(sdp_tree, tvb, offset, datalen,
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"Data (%d bytes)", datalen);
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}
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}
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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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static gint *ett[] = {
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&ett_sdp,
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};
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proto_sdp = proto_register_protocol("Session Description Protocol",
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"SDP", "sdp");
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/* proto_register_field_array(proto_sdp, hf, array_length(hf));*/
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proto_register_subtree_array(ett, array_length(ett));
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/*
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* Register the dissector by name, so other dissectors can
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* grab it by name rather than just referring to it directly
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* (you can't refer to it directly from a plugin dissector
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* on Windows without stuffing it into the Big Transfer Vector).
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*/
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register_dissector("sdp", dissect_sdp, proto_sdp);
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}
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