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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