forked from osmocom/wireshark
![Ulf Lamping](/assets/img/avatar_default.png)
I've changed all settings I could find to TRUE. It might be reasonable to change some protocol settings back to FALSE, if reassembling fails very often. svn path=/trunk/; revision=16048
1338 lines
37 KiB
C
1338 lines
37 KiB
C
/* packet-rtsp.c
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* Routines for RTSP packet disassembly (RFC 2326)
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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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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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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* References:
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* RTSP is defined in RFC 2326, http://www.ietf.org/rfc/rfc2326.txt?number=2326
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* http://www.iana.org/assignments/rsvp-parameters
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*/
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#include "config.h"
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#include <string.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <epan/prefs.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/req_resp_hdrs.h>
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#include "packet-rtp.h"
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#include "packet-rtcp.h"
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#include "packet-rdt.h"
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#include <epan/conversation.h>
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#include <epan/strutil.h>
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#include "packet-e164.h"
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#include <epan/emem.h>
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static int proto_rtsp = -1;
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static gint ett_rtsp = -1;
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static gint ett_rtspframe = -1;
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static gint ett_rtsp_method = -1;
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static int hf_rtsp_request = -1;
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static int hf_rtsp_response = -1;
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static int hf_rtsp_content_type = -1;
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static int hf_rtsp_content_length = -1;
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static int hf_rtsp_method = -1;
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static int hf_rtsp_url = -1;
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static int hf_rtsp_status = -1;
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static int hf_rtsp_session = -1;
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static int hf_rtsp_transport = -1;
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static int hf_rtsp_rdtfeaturelevel = -1;
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static int hf_rtsp_X_Vig_Msisdn = -1;
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static dissector_handle_t sdp_handle;
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static dissector_handle_t rtp_handle;
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static dissector_handle_t rtcp_handle;
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static dissector_handle_t rdt_handle;
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void proto_reg_handoff_rtsp(void);
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/*
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* desegmentation of RTSP headers
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* (when we are over TCP or another protocol providing the desegmentation API)
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*/
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static gboolean rtsp_desegment_headers = TRUE;
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/*
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* desegmentation of RTSP bodies
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* (when we are over TCP or another protocol providing the desegmentation API)
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* TODO let the user filter on content-type the bodies he wants desegmented
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*/
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static gboolean rtsp_desegment_body = TRUE;
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/* http://www.iana.org/assignments/port-numberslists two rtsp ports */
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#define TCP_PORT_RTSP 554
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#define TCP_ALTERNATE_PORT_RTSP 8554
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static guint global_rtsp_tcp_port = TCP_PORT_RTSP;
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static guint global_rtsp_tcp_alternate_port = TCP_ALTERNATE_PORT_RTSP;
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/*
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* Variables to allow for proper deletion of dissector registration when
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* the user changes port from the gui.
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*/
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static guint tcp_port = 0;
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static guint tcp_alternate_port = 0;
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/*
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* Takes an array of bytes, assumed to contain a null-terminated
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* string, as an argument, and returns the length of the string -
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* i.e., the size of the array, minus 1 for the null terminator.
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*/
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#define STRLEN_CONST(str) (sizeof (str) - 1)
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#define RTSP_FRAMEHDR ('$')
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typedef struct {
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dissector_handle_t dissector;
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} rtsp_interleaved_t;
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#define RTSP_MAX_INTERLEAVED (8)
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/*
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* Careful about dynamically allocating memory in this structure (say
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* for dynamically increasing the size of the 'interleaved' array) -
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* the containing structure is garbage collected and contained
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* pointers will not be freed.
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*/
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typedef struct {
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rtsp_interleaved_t interleaved[RTSP_MAX_INTERLEAVED];
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} rtsp_conversation_data_t;
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static int
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dissect_rtspinterleaved(tvbuff_t *tvb, int offset, packet_info *pinfo,
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proto_tree *tree)
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{
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guint length_remaining;
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proto_item *ti;
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proto_tree *rtspframe_tree = NULL;
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int orig_offset;
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guint8 rf_start; /* always RTSP_FRAMEHDR */
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guint8 rf_chan; /* interleaved channel id */
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guint16 rf_len; /* packet length */
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tvbuff_t *next_tvb;
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conversation_t *conv;
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rtsp_conversation_data_t *data;
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dissector_handle_t dissector;
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/*
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* This will throw an exception if we don't have any data left.
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* That's what we want. (See "tcp_dissect_pdus()", which is
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* similar.)
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*/
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length_remaining = tvb_ensure_length_remaining(tvb, offset);
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/*
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* Can we do reassembly?
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*/
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if (rtsp_desegment_headers && pinfo->can_desegment) {
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/*
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* Yes - would an RTSP multiplexed header starting at
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* this offset be split across segment boundaries?
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*/
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if (length_remaining < 4) {
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/*
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* Yes. Tell the TCP dissector where the data
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* for this message starts in the data it handed
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* us, and how many more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = 4 - length_remaining;
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return -1;
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}
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}
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/*
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* Get the "$", channel, and length from the header.
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*/
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orig_offset = offset;
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rf_start = tvb_get_guint8(tvb, offset);
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rf_chan = tvb_get_guint8(tvb, offset+1);
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rf_len = tvb_get_ntohs(tvb, offset+2);
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/*
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* Can we do reassembly?
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*/
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if (rtsp_desegment_body && pinfo->can_desegment) {
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/*
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* Yes - is the header + encapsulated packet split
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* across segment boundaries?
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*/
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if (length_remaining < 4U + rf_len) {
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/*
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* Yes. Tell the TCP dissector where the data
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* for this message starts in the data it handed
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* us, and how many more bytes we need, and return.
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*/
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pinfo->desegment_offset = offset;
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pinfo->desegment_len = 4U + rf_len - length_remaining;
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return -1;
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}
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}
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if (check_col(pinfo->cinfo, COL_INFO))
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"Interleaved channel 0x%02x, %u bytes",
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rf_chan, rf_len);
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if (tree != NULL) {
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ti = proto_tree_add_protocol_format(tree, proto_rtsp, tvb,
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offset, 4,
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"RTSP Interleaved Frame, Channel: 0x%02x, %u bytes",
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rf_chan, rf_len);
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rtspframe_tree = proto_item_add_subtree(ti, ett_rtspframe);
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proto_tree_add_text(rtspframe_tree, tvb, offset, 1,
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"Magic: 0x%02x",
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rf_start);
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}
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offset += 1;
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if (tree != NULL) {
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proto_tree_add_text(rtspframe_tree, tvb, offset, 1,
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"Channel: 0x%02x",
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rf_chan);
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}
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offset += 1;
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if (tree != NULL) {
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proto_tree_add_text(rtspframe_tree, tvb, offset, 2,
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"Length: %u bytes",
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rf_len);
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}
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offset += 2;
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/*
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* We set the actual length of the tvbuff for the interleaved
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* stuff to the minimum of what's left in the tvbuff and the
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* length in the header.
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*
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* XXX - what if there's nothing left in the tvbuff?
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* We'd want a BoundsError exception to be thrown, so
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* that a Short Frame would be reported.
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*/
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if (length_remaining > rf_len)
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length_remaining = rf_len;
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next_tvb = tvb_new_subset(tvb, offset, length_remaining, rf_len);
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conv = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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if (conv &&
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(data = conversation_get_proto_data(conv, proto_rtsp)) &&
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rf_chan < RTSP_MAX_INTERLEAVED &&
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(dissector = data->interleaved[rf_chan].dissector)) {
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call_dissector(dissector, next_tvb, pinfo, tree);
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} else {
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proto_tree_add_text(rtspframe_tree, tvb, offset, rf_len,
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"Data (%u bytes)", rf_len);
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}
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offset += rf_len;
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return offset - orig_offset;
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}
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static void process_rtsp_request(tvbuff_t *tvb, int offset, const guchar *data,
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size_t linelen, size_t next_line_offset,
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proto_tree *tree);
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static void process_rtsp_reply(tvbuff_t *tvb, int offset, const guchar *data,
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size_t linelen, size_t next_line_offset,
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proto_tree *tree);
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typedef enum {
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RTSP_REQUEST,
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RTSP_REPLY,
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RTSP_NOT_FIRST_LINE
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} rtsp_type_t;
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static const char *rtsp_methods[] = {
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"DESCRIBE",
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"ANNOUNCE",
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"GET_PARAMETER",
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"OPTIONS",
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"PAUSE",
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"PLAY",
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"RECORD",
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"REDIRECT",
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"SETUP",
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"SET_PARAMETER",
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"TEARDOWN"
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};
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#define RTSP_NMETHODS (sizeof rtsp_methods / sizeof rtsp_methods[0])
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static gboolean
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is_rtsp_request_or_reply(const guchar *line, size_t linelen, rtsp_type_t *type)
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{
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unsigned ii;
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/* Is this an RTSP reply? */
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if (linelen >= 5 && strncasecmp("RTSP/", line, 5) == 0) {
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/*
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* Yes.
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*/
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*type = RTSP_REPLY;
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return TRUE;
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}
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/*
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* Is this an RTSP request?
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* Check whether the line begins with one of the RTSP request
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* methods.
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*/
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for (ii = 0; ii < RTSP_NMETHODS; ii++) {
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size_t len = strlen(rtsp_methods[ii]);
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if (linelen >= len &&
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strncasecmp(rtsp_methods[ii], line, len) == 0 &&
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(len == linelen || isspace(line[len])))
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{
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*type = RTSP_REQUEST;
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return TRUE;
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}
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}
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/* Wasn't a request or a response */
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*type = RTSP_NOT_FIRST_LINE;
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return FALSE;
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}
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static const char rtsp_content_type[] = "Content-Type:";
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static int
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is_content_sdp(const guchar *line, size_t linelen)
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{
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static const char type[] = "application/sdp";
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size_t typelen = STRLEN_CONST(type);
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line += STRLEN_CONST(rtsp_content_type);
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linelen -= STRLEN_CONST(rtsp_content_type);
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while (linelen > 0 && (*line == ' ' || *line == '\t')) {
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line++;
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linelen--;
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}
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if (linelen < typelen || strncasecmp(type, line, typelen))
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return FALSE;
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line += typelen;
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linelen -= typelen;
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if (linelen > 0 && !isspace(*line))
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return FALSE;
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return TRUE;
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}
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static const char rtsp_transport[] = "Transport:";
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static const char rtsp_sps[] = "server_port=";
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static const char rtsp_cps[] = "client_port=";
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static const char rtsp_rtp[] = "rtp/";
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static const char rtsp_rdt_feature_level[] = "RDTFeatureLevel";
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static const char rtsp_real_rdt[] = "x-real-rdt/";
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static const char rtsp_real_tng[] = "x-pn-tng/"; /* synonym for x-real-rdt */
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static const char rtsp_inter[] = "interleaved=";
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static void
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rtsp_create_conversation(packet_info *pinfo, const guchar *line_begin,
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size_t line_len, gint rdt_feature_level)
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{
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conversation_t *conv;
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guchar buf[256];
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guchar *tmp;
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gboolean rtp_transport = FALSE;
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gboolean rdt_transport = FALSE;
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guint c_data_port, c_mon_port;
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guint s_data_port, s_mon_port;
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/* Copy line into buf */
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if (line_len > sizeof(buf) - 1)
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{
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/* Don't overflow the buffer. */
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line_len = sizeof(buf) - 1;
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}
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memcpy(buf, line_begin, line_len);
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buf[line_len] = '\0';
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/* Get past "Transport:" and spaces */
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tmp = buf + STRLEN_CONST(rtsp_transport);
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while (*tmp && isspace(*tmp))
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tmp++;
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/* Work out which transport type is here */
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if (strncasecmp(tmp, rtsp_rtp, strlen(rtsp_rtp)) == 0)
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rtp_transport = TRUE;
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else
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if (strncasecmp(tmp, rtsp_real_rdt, strlen(rtsp_real_rdt)) == 0 ||
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strncasecmp(tmp, rtsp_real_tng, strlen(rtsp_real_tng)) == 0)
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rdt_transport = TRUE;
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else
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{
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/* Give up on unknown transport types */
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return;
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}
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c_data_port = c_mon_port = 0;
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s_data_port = s_mon_port = 0;
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/* Look for server port */
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if ((tmp = strstr(buf, rtsp_sps))) {
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tmp += strlen(rtsp_sps);
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if (sscanf(tmp, "%u-%u", &s_data_port, &s_mon_port) < 1) {
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g_warning("Frame %u: rtsp: bad server_port",
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pinfo->fd->num);
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return;
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}
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}
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/* Look for client port */
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if ((tmp = strstr(buf, rtsp_cps))) {
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tmp += strlen(rtsp_cps);
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if (sscanf(tmp, "%u-%u", &c_data_port, &c_mon_port) < 1) {
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g_warning("Frame %u: rtsp: bad client_port",
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pinfo->fd->num);
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return;
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}
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}
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/* Deal with RTSP TCP-interleaved conversations. */
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if (!c_data_port) {
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rtsp_conversation_data_t *data;
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guint s_data_chan, s_mon_chan;
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int i;
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/* Search tranport line for interleaved string */
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if ((tmp = strstr(buf, rtsp_inter)) == NULL) {
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/*
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* No interleaved or server_port - probably a
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* SETUP request, rather than reply.
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*/
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return;
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}
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/* Move tmp to beyone interleaved string */
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tmp += strlen(rtsp_inter);
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/* Look for channel number(s) */
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i = sscanf(tmp, "%u-%u", &s_data_chan, &s_mon_chan);
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if (i < 1)
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{
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g_warning("Frame %u: rtsp: bad interleaved", pinfo->fd->num);
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return;
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}
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/* At least data channel present, look for conversation (presumably TCP) */
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conv = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst, pinfo->ptype,
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pinfo->srcport, pinfo->destport, 0);
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/* Create new conversation if necessary */
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if (!conv)
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{
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conv = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
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pinfo->ptype, pinfo->srcport, pinfo->destport,
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0);
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}
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/* Look for previous data */
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data = conversation_get_proto_data(conv, proto_rtsp);
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/* Create new data if necessary */
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if (!data)
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{
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data = se_alloc(sizeof(rtsp_conversation_data_t));
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conversation_add_proto_data(conv, proto_rtsp, data);
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}
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/* Now set the dissector handle of the interleaved channel
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according to the transport protocol used */
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if (rtp_transport)
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{
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if (s_data_chan < RTSP_MAX_INTERLEAVED) {
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data->interleaved[s_data_chan].dissector =
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rtp_handle;
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}
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if (i > 1 && s_mon_chan < RTSP_MAX_INTERLEAVED) {
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data->interleaved[s_mon_chan].dissector =
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rtcp_handle;
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}
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}
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else if (rdt_transport)
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{
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if (s_data_chan < RTSP_MAX_INTERLEAVED) {
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data->interleaved[s_data_chan].dissector =
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rdt_handle;
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}
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}
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return;
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}
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/*
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* We only want to match on the destination address, not the
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* source address, because the server might send back a packet
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* from an address other than the address to which its client
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* sent the packet, so we construct a conversation with no
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* second address.
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*/
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if (rtp_transport)
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{
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/* There is always data for RTP */
|
|
rtp_add_address(pinfo, &pinfo->dst, c_data_port, s_data_port,
|
|
"RTSP", pinfo->fd->num, NULL);
|
|
|
|
/* RTCP only if indicated */
|
|
if (c_mon_port)
|
|
{
|
|
rtcp_add_address(pinfo, &pinfo->dst, c_mon_port, s_mon_port,
|
|
"RTSP", pinfo->fd->num);
|
|
}
|
|
}
|
|
else
|
|
if (rdt_transport)
|
|
{
|
|
/* Real Data Transport */
|
|
rdt_add_address(pinfo, &pinfo->dst, c_data_port, s_data_port,
|
|
"RTSP", rdt_feature_level);
|
|
}
|
|
}
|
|
|
|
static const char rtsp_content_length[] = "Content-Length:";
|
|
|
|
static int
|
|
rtsp_get_content_length(const guchar *line_begin, size_t line_len)
|
|
{
|
|
guchar buf[256];
|
|
guchar *tmp;
|
|
long content_length;
|
|
char *p;
|
|
guchar *up;
|
|
|
|
if (line_len > sizeof(buf) - 1) {
|
|
/*
|
|
* Don't overflow the buffer.
|
|
*/
|
|
line_len = sizeof(buf) - 1;
|
|
}
|
|
memcpy(buf, line_begin, line_len);
|
|
buf[line_len] = '\0';
|
|
|
|
tmp = buf + STRLEN_CONST(rtsp_content_length);
|
|
while (*tmp && isspace(*tmp))
|
|
tmp++;
|
|
content_length = strtol(tmp, &p, 10);
|
|
up = p;
|
|
if (up == tmp || (*up != '\0' && !isspace(*up)))
|
|
return -1; /* not a valid number */
|
|
return content_length;
|
|
}
|
|
|
|
static const char rtsp_Session[] = "Session:";
|
|
static const char rtsp_X_Vig_Msisdn[] = "X-Vig-Msisdn";
|
|
|
|
static int
|
|
dissect_rtspmessage(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
proto_tree *tree)
|
|
{
|
|
proto_tree *rtsp_tree = NULL;
|
|
proto_tree *sub_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
const guchar *line;
|
|
gint next_offset;
|
|
const guchar *linep, *lineend;
|
|
int orig_offset;
|
|
int first_linelen, linelen;
|
|
int line_end_offset;
|
|
int colon_offset;
|
|
gboolean is_request_or_reply;
|
|
gboolean body_requires_content_len;
|
|
gboolean saw_req_resp_or_header;
|
|
guchar c;
|
|
rtsp_type_t rtsp_type;
|
|
gboolean is_header;
|
|
int is_sdp = FALSE;
|
|
int datalen;
|
|
int content_length;
|
|
int reported_datalen;
|
|
int value_offset;
|
|
int value_len;
|
|
e164_info_t e164_info;
|
|
gint rdt_feature_level = 0;
|
|
|
|
/*
|
|
* Is this a request or response?
|
|
*
|
|
* Note that "tvb_find_line_end()" will return a value that
|
|
* is not longer than what's in the buffer, so the
|
|
* "tvb_get_ptr()" call won't throw an exception.
|
|
*/
|
|
first_linelen = tvb_find_line_end(tvb, offset,
|
|
tvb_ensure_length_remaining(tvb, offset), &next_offset,
|
|
FALSE);
|
|
|
|
/*
|
|
* Is the first line a request or response?
|
|
*/
|
|
line = tvb_get_ptr(tvb, offset, first_linelen);
|
|
is_request_or_reply = is_rtsp_request_or_reply(line, first_linelen,
|
|
&rtsp_type);
|
|
if (is_request_or_reply) {
|
|
/*
|
|
* Yes, it's a request or response.
|
|
* Do header desegmentation if we've been told to,
|
|
* and do body desegmentation if we've been told to and
|
|
* we find a Content-Length header.
|
|
*/
|
|
if (!req_resp_hdrs_do_reassembly(tvb, offset, pinfo,
|
|
rtsp_desegment_headers, rtsp_desegment_body)) {
|
|
/*
|
|
* More data needed for desegmentation.
|
|
*/
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* RFC 2326 says that a content length must be specified
|
|
* in requests that have a body, although section 4.4 speaks
|
|
* of a server closing the connection indicating the end of
|
|
* a reply body.
|
|
*
|
|
* We assume that an absent content length in a request means
|
|
* that we don't have a body, and that an absent content length
|
|
* in a reply means that the reply body runs to the end of
|
|
* the connection. If the first line is neither, we assume
|
|
* that whatever follows a blank line should be treated as a
|
|
* body; there's not much else we can do, as we're jumping
|
|
* into the message in the middle.
|
|
*
|
|
* XXX - if there was no Content-Length entity header, we should
|
|
* accumulate all data until the end of the connection.
|
|
* That'd require that the TCP dissector call subdissectors
|
|
* for all frames with FIN, even if they contain no data,
|
|
* which would require subdissectors to deal intelligently
|
|
* with empty segments.
|
|
*/
|
|
if (rtsp_type == RTSP_REQUEST)
|
|
body_requires_content_len = TRUE;
|
|
else
|
|
body_requires_content_len = FALSE;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTSP");
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
/*
|
|
* Put the first line from the buffer into the summary
|
|
* if it's an RTSP request or reply (but leave out the
|
|
* line terminator).
|
|
* Otherwise, just call it a continuation.
|
|
*
|
|
* Note that "tvb_find_line_end()" will return a value that
|
|
* is not longer than what's in the buffer, so the
|
|
* "tvb_get_ptr()" call won't throw an exception.
|
|
*/
|
|
line = tvb_get_ptr(tvb, offset, first_linelen);
|
|
if (is_request_or_reply)
|
|
if ( rtsp_type == RTSP_REPLY ) {
|
|
col_add_str(pinfo->cinfo, COL_INFO, "Reply: ");
|
|
col_append_str(pinfo->cinfo, COL_INFO,
|
|
format_text(line, first_linelen));
|
|
}
|
|
else
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
format_text(line, first_linelen));
|
|
|
|
else
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Continuation");
|
|
|
|
}
|
|
|
|
orig_offset = offset;
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_rtsp, tvb, offset, -1,
|
|
FALSE);
|
|
rtsp_tree = proto_item_add_subtree(ti, ett_rtsp);
|
|
}
|
|
|
|
/*
|
|
* We haven't yet seen a Content-Length header.
|
|
*/
|
|
content_length = -1;
|
|
|
|
/*
|
|
* Process the packet data, a line at a time.
|
|
*/
|
|
saw_req_resp_or_header = FALSE; /* haven't seen anything yet */
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
/*
|
|
* We haven't yet concluded that this is a header.
|
|
*/
|
|
is_header = FALSE;
|
|
|
|
/*
|
|
* Find the end of the line.
|
|
*/
|
|
linelen = tvb_find_line_end(tvb, offset,
|
|
tvb_ensure_length_remaining(tvb, offset), &next_offset,
|
|
FALSE);
|
|
if (linelen < 0)
|
|
return -1;
|
|
line_end_offset = offset + linelen;
|
|
/*
|
|
* colon_offset may be -1
|
|
*/
|
|
colon_offset = tvb_find_guint8(tvb, offset, linelen, ':');
|
|
|
|
|
|
/*
|
|
* Get a buffer that refers to the line.
|
|
*/
|
|
line = tvb_get_ptr(tvb, offset, linelen);
|
|
lineend = line + linelen;
|
|
|
|
/*
|
|
* OK, does it look like an RTSP request or response?
|
|
*/
|
|
is_request_or_reply = is_rtsp_request_or_reply(line, linelen, &rtsp_type);
|
|
if (is_request_or_reply)
|
|
goto is_rtsp;
|
|
|
|
/*
|
|
* No. Does it look like a blank line (as would appear
|
|
* at the end of an RTSP request)?
|
|
*/
|
|
if (linelen == 0)
|
|
goto is_rtsp; /* Yes. */
|
|
|
|
/*
|
|
* No. Does it look like a header?
|
|
*/
|
|
linep = line;
|
|
while (linep < lineend) {
|
|
c = *linep++;
|
|
|
|
/*
|
|
* This must be a CHAR to be part of a token; that
|
|
* means it must be ASCII.
|
|
*/
|
|
if (!isascii(c))
|
|
break; /* not ASCII, thus not a CHAR */
|
|
|
|
/*
|
|
* This mustn't be a CTL to be part of a token.
|
|
*
|
|
* XXX - what about leading LWS on continuation
|
|
* lines of a header?
|
|
*/
|
|
if (iscntrl(c))
|
|
break; /* CTL, not part of a header */
|
|
|
|
switch (c) {
|
|
|
|
case '(':
|
|
case ')':
|
|
case '<':
|
|
case '>':
|
|
case '@':
|
|
case ',':
|
|
case ';':
|
|
case '\\':
|
|
case '"':
|
|
case '/':
|
|
case '[':
|
|
case ']':
|
|
case '?':
|
|
case '=':
|
|
case '{':
|
|
case '}':
|
|
/*
|
|
* It's a tspecial, so it's not
|
|
* part of a token, so it's not
|
|
* a field name for the beginning
|
|
* of a header.
|
|
*/
|
|
goto not_rtsp;
|
|
|
|
case ':':
|
|
/*
|
|
* This ends the token; we consider
|
|
* this to be a header.
|
|
*/
|
|
is_header = TRUE;
|
|
goto is_rtsp;
|
|
|
|
case ' ':
|
|
case '\t':
|
|
/*
|
|
* LWS (RFC-2616, 4.2); continue the previous
|
|
* header.
|
|
*/
|
|
goto is_rtsp;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We haven't seen the colon, but everything else looks
|
|
* OK for a header line.
|
|
*
|
|
* If we've already seen an RTSP request or response
|
|
* line, or a header line, and we're at the end of
|
|
* the tvbuff, we assume this is an incomplete header
|
|
* line. (We quit this loop after seeing a blank line,
|
|
* so if we've seen a request or response line, or a
|
|
* header line, this is probably more of the request
|
|
* or response we're presumably seeing. There is some
|
|
* risk of false positives, but the same applies for
|
|
* full request or response lines or header lines,
|
|
* although that's less likely.)
|
|
*
|
|
* We throw an exception in that case, by checking for
|
|
* the existence of the next byte after the last one
|
|
* in the line. If it exists, "tvb_ensure_bytes_exist()"
|
|
* throws no exception, and we fall through to the
|
|
* "not RTSP" case. If it doesn't exist,
|
|
* "tvb_ensure_bytes_exist()" will throw the appropriate
|
|
* exception.
|
|
*/
|
|
if (saw_req_resp_or_header)
|
|
tvb_ensure_bytes_exist(tvb, offset, linelen + 1);
|
|
|
|
not_rtsp:
|
|
/*
|
|
* We don't consider this part of an RTSP request or
|
|
* reply, so we don't display it.
|
|
*/
|
|
break;
|
|
|
|
is_rtsp:
|
|
/*
|
|
* Process this line.
|
|
*/
|
|
if (linelen == 0) {
|
|
/*
|
|
* This is a blank line, which means that
|
|
* whatever follows it isn't part of this
|
|
* request or reply.
|
|
*/
|
|
proto_tree_add_text(rtsp_tree, tvb, offset,
|
|
next_offset - offset, "%s",
|
|
tvb_format_text(tvb, offset, next_offset - offset));
|
|
offset = next_offset;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Not a blank line - either a request, a reply, or a header
|
|
* line.
|
|
*/
|
|
saw_req_resp_or_header = TRUE;
|
|
if (rtsp_tree) {
|
|
|
|
switch (rtsp_type)
|
|
{
|
|
case RTSP_REQUEST:
|
|
process_rtsp_request(tvb, offset, line, linelen, next_offset, rtsp_tree);
|
|
break;
|
|
|
|
case RTSP_REPLY:
|
|
process_rtsp_reply(tvb, offset, line, linelen, next_offset, rtsp_tree);
|
|
break;
|
|
|
|
case RTSP_NOT_FIRST_LINE:
|
|
/* Drop through, it may well be a header line */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (is_header)
|
|
{
|
|
/* We know that colon_offset must be set */
|
|
|
|
/* Skip whitespace after the colon. */
|
|
value_offset = colon_offset + 1;
|
|
while ((value_offset < line_end_offset) &&
|
|
((c = tvb_get_guint8(tvb, value_offset)) == ' ' || c == '\t'))
|
|
{
|
|
value_offset++;
|
|
}
|
|
value_len = line_end_offset - value_offset;
|
|
|
|
/*
|
|
* Process some headers specially.
|
|
*/
|
|
#define HDR_MATCHES(header) \
|
|
( (size_t)linelen > STRLEN_CONST(header) && \
|
|
strncasecmp(line, (header), STRLEN_CONST(header)) == 0)
|
|
|
|
if (HDR_MATCHES(rtsp_transport))
|
|
{
|
|
proto_tree_add_string(rtsp_tree, hf_rtsp_transport, tvb,
|
|
offset, linelen,
|
|
tvb_format_text(tvb, value_offset,
|
|
value_len));
|
|
|
|
/*
|
|
* Based on the port numbers specified
|
|
* in the Transport: header, set up
|
|
* a conversation that will be dissected
|
|
* with the appropriate dissector.
|
|
*/
|
|
rtsp_create_conversation(pinfo, line, linelen, rdt_feature_level);
|
|
} else if (HDR_MATCHES(rtsp_content_type))
|
|
{
|
|
proto_tree_add_string(rtsp_tree, hf_rtsp_content_type,
|
|
tvb, offset, linelen,
|
|
tvb_format_text(tvb, value_offset,
|
|
value_len));
|
|
|
|
/*
|
|
* If the Content-Type: header says this
|
|
* is SDP, dissect the payload as SDP.
|
|
*
|
|
* XXX - we should just do the same
|
|
* sort of header processing
|
|
* that HTTP does, and use the
|
|
* "media_type" dissector table on
|
|
* the content type.
|
|
*
|
|
* We should use those for Transport:
|
|
* and Content-Length: as well (and
|
|
* should process Content-Length: in
|
|
* HTTP).
|
|
*/
|
|
if (is_content_sdp(line, linelen))
|
|
{
|
|
is_sdp = TRUE;
|
|
}
|
|
} else if (HDR_MATCHES(rtsp_content_length))
|
|
{
|
|
proto_tree_add_uint(rtsp_tree, hf_rtsp_content_length,
|
|
tvb, offset, linelen,
|
|
atoi(tvb_format_text(tvb, value_offset,
|
|
value_len)));
|
|
|
|
/*
|
|
* Only the amount specified by the
|
|
* Content-Length: header should be treated
|
|
* as payload.
|
|
*/
|
|
content_length = rtsp_get_content_length(line, linelen);
|
|
|
|
} else if (HDR_MATCHES(rtsp_Session))
|
|
{
|
|
/* Put the value into the protocol tree */
|
|
proto_tree_add_string(rtsp_tree, hf_rtsp_session, tvb,
|
|
offset, linelen,
|
|
tvb_format_text(tvb, value_offset, value_len));
|
|
|
|
} else if (HDR_MATCHES(rtsp_X_Vig_Msisdn)) {
|
|
/*
|
|
* Extract the X_Vig_Msisdn string
|
|
*/
|
|
if (colon_offset != -1)
|
|
{
|
|
/* Put the value into the protocol tree */
|
|
ti = proto_tree_add_string(rtsp_tree, hf_rtsp_X_Vig_Msisdn,tvb,
|
|
offset, linelen ,
|
|
tvb_format_text(tvb, value_offset, value_len));
|
|
sub_tree = proto_item_add_subtree(ti, ett_rtsp_method);
|
|
|
|
e164_info.e164_number_type = CALLING_PARTY_NUMBER;
|
|
e164_info.nature_of_address = 0;
|
|
|
|
e164_info.E164_number_str = tvb_get_ephemeral_string(tvb, value_offset,
|
|
value_len);
|
|
e164_info.E164_number_length = value_len;
|
|
dissect_e164_number(tvb, sub_tree, value_offset,
|
|
value_len, e164_info);
|
|
}
|
|
} else if (HDR_MATCHES(rtsp_rdt_feature_level))
|
|
{
|
|
rdt_feature_level = atoi(tvb_format_text(tvb, value_offset,
|
|
value_len));
|
|
proto_tree_add_uint(rtsp_tree, hf_rtsp_rdtfeaturelevel,
|
|
tvb, offset, linelen,
|
|
atoi(tvb_format_text(tvb, value_offset,
|
|
value_len)));
|
|
}
|
|
else
|
|
{
|
|
/* Default case for headers. Show line as text */
|
|
proto_tree_add_text(rtsp_tree, tvb, offset,
|
|
next_offset - offset, "%s",
|
|
tvb_format_text(tvb, offset, next_offset - offset));
|
|
}
|
|
}
|
|
else if (rtsp_type == RTSP_NOT_FIRST_LINE)
|
|
{
|
|
/* Catch-all for all other lines... Show line as text.
|
|
TODO: should these be shown as errors? */
|
|
proto_tree_add_text(rtsp_tree, tvb, offset,
|
|
next_offset - offset, "%s",
|
|
tvb_format_text(tvb, offset, next_offset - offset));
|
|
}
|
|
|
|
offset = next_offset;
|
|
}
|
|
|
|
/*
|
|
* Have now read all of the lines of this message.
|
|
*
|
|
* If a content length was supplied, the amount of data to be
|
|
* processed as RTSP payload is the minimum of the content
|
|
* length and the amount of data remaining in the frame.
|
|
*
|
|
* If no content length was supplied (or if a bad content length
|
|
* was supplied), the amount of data to be processed is the amount
|
|
* of data remaining in the frame.
|
|
*/
|
|
datalen = tvb_length_remaining(tvb, offset);
|
|
reported_datalen = tvb_reported_length_remaining(tvb, offset);
|
|
if (content_length != -1) {
|
|
/*
|
|
* Content length specified; display only that amount
|
|
* as payload.
|
|
*/
|
|
if (datalen > content_length)
|
|
datalen = content_length;
|
|
|
|
/*
|
|
* XXX - limit the reported length in the tvbuff we'll
|
|
* hand to a subdissector to be no greater than the
|
|
* content length.
|
|
*
|
|
* We really need both unreassembled and "how long it'd
|
|
* be if it were reassembled" lengths for tvbuffs, so
|
|
* that we throw the appropriate exceptions for
|
|
* "not enough data captured" (running past the length),
|
|
* "packet needed reassembly" (within the length but
|
|
* running past the unreassembled length), and
|
|
* "packet is malformed" (running past the reassembled
|
|
* length).
|
|
*/
|
|
if (reported_datalen > content_length)
|
|
reported_datalen = content_length;
|
|
} else {
|
|
/*
|
|
* No content length specified; if this message doesn't
|
|
* have a body if no content length is specified, process
|
|
* nothing as payload.
|
|
*/
|
|
if (body_requires_content_len)
|
|
datalen = 0;
|
|
}
|
|
|
|
if (datalen > 0) {
|
|
/*
|
|
* There's stuff left over; process it.
|
|
*/
|
|
if (is_sdp) {
|
|
tvbuff_t *new_tvb;
|
|
|
|
/*
|
|
* Fix up the top-level item so that it doesn't
|
|
* include the SDP stuff.
|
|
*/
|
|
if (ti != NULL)
|
|
proto_item_set_len(ti, offset);
|
|
|
|
/*
|
|
* Now create a tvbuff for the SDP stuff and
|
|
* dissect it.
|
|
*
|
|
* The amount of data to be processed that's
|
|
* available in the tvbuff is "datalen", which
|
|
* is the minimum of the amount of data left in
|
|
* the tvbuff and any specified content length.
|
|
*
|
|
* The amount of data to be processed that's in
|
|
* this frame, regardless of whether it was
|
|
* captured or not, is "reported_datalen",
|
|
* which, if no content length was specified,
|
|
* is -1, i.e. "to the end of the frame.
|
|
*/
|
|
new_tvb = tvb_new_subset(tvb, offset, datalen,
|
|
reported_datalen);
|
|
call_dissector(sdp_handle, new_tvb, pinfo, tree);
|
|
} else {
|
|
if (tvb_get_guint8(tvb, offset) == RTSP_FRAMEHDR) {
|
|
/*
|
|
* This is interleaved stuff; don't
|
|
* treat it as raw data - set "datalen"
|
|
* to 0, so we won't skip the offset
|
|
* past it, which will cause our
|
|
* caller to process that stuff itself.
|
|
*/
|
|
datalen = 0;
|
|
} else {
|
|
proto_tree_add_text(rtsp_tree, tvb, offset,
|
|
datalen, "Data (%d bytes)",
|
|
reported_datalen);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We've processed "datalen" bytes worth of data
|
|
* (which may be no data at all); advance the
|
|
* offset past whatever data we've processed.
|
|
*/
|
|
offset += datalen;
|
|
}
|
|
return offset - orig_offset;
|
|
}
|
|
|
|
static void
|
|
process_rtsp_request(tvbuff_t *tvb, int offset, const guchar *data,
|
|
size_t linelen, size_t next_line_offset, proto_tree *tree)
|
|
{
|
|
proto_tree *sub_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
const guchar *lineend = data + linelen;
|
|
unsigned ii;
|
|
const guchar *url;
|
|
const guchar *url_start;
|
|
guchar *tmp_url;
|
|
|
|
/* Request Methods */
|
|
for (ii = 0; ii < RTSP_NMETHODS; ii++) {
|
|
size_t len = strlen(rtsp_methods[ii]);
|
|
if (linelen >= len &&
|
|
strncasecmp(rtsp_methods[ii], data, len) == 0 &&
|
|
(len == linelen || isspace(data[len])))
|
|
break;
|
|
}
|
|
if (ii == RTSP_NMETHODS) {
|
|
/*
|
|
* We got here because "is_rtsp_request_or_reply()" returned
|
|
* RTSP_REQUEST, so we know one of the request methods
|
|
* matched, so we "can't get here".
|
|
*/
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
}
|
|
|
|
/* Add a tree for this request */
|
|
ti = proto_tree_add_string(tree, hf_rtsp_request, tvb, offset,
|
|
next_line_offset - offset,
|
|
tvb_format_text(tvb, offset, next_line_offset - offset));
|
|
sub_tree = proto_item_add_subtree(ti, ett_rtsp_method);
|
|
|
|
|
|
/* Add method name to tree */
|
|
proto_tree_add_string(sub_tree, hf_rtsp_method, tvb, offset,
|
|
strlen(rtsp_methods[ii]), rtsp_methods[ii]);
|
|
|
|
/* URL */
|
|
url = data;
|
|
/* Skip method name again */
|
|
while (url < lineend && !isspace(*url))
|
|
url++;
|
|
/* Skip spaces */
|
|
while (url < lineend && isspace(*url))
|
|
url++;
|
|
/* URL starts here */
|
|
url_start = url;
|
|
/* Scan to end of URL */
|
|
while (url < lineend && !isspace(*url))
|
|
url++;
|
|
/* Create a URL-sized buffer and copy contents */
|
|
tmp_url = ep_alloc(url - url_start + 1);
|
|
memcpy(tmp_url, url_start, url - url_start);
|
|
tmp_url[url - url_start] = '\0';
|
|
|
|
/* Add URL to tree */
|
|
proto_tree_add_string(sub_tree, hf_rtsp_url, tvb,
|
|
offset + (url_start - data), url - url_start, tmp_url);
|
|
}
|
|
|
|
/* Read first line of a reply message */
|
|
static void
|
|
process_rtsp_reply(tvbuff_t *tvb, int offset, const guchar *data,
|
|
size_t linelen, size_t next_line_offset, proto_tree *tree)
|
|
{
|
|
proto_tree *sub_tree = NULL;
|
|
proto_item *ti = NULL;
|
|
const guchar *lineend = data + linelen;
|
|
const guchar *status = data;
|
|
const guchar *status_start;
|
|
unsigned int status_i;
|
|
|
|
/* Add a tree for this request */
|
|
ti = proto_tree_add_string(tree, hf_rtsp_response, tvb, offset,
|
|
next_line_offset - offset,
|
|
tvb_format_text(tvb, offset, next_line_offset - offset));
|
|
sub_tree = proto_item_add_subtree(ti, ett_rtsp_method);
|
|
|
|
|
|
/* status code */
|
|
|
|
/* Skip protocol/version */
|
|
while (status < lineend && !isspace(*status))
|
|
status++;
|
|
/* Skip spaces */
|
|
while (status < lineend && isspace(*status))
|
|
status++;
|
|
|
|
/* Actual code number now */
|
|
status_start = status;
|
|
status_i = 0;
|
|
while (status < lineend && isdigit(*status))
|
|
status_i = status_i * 10 + *status++ - '0';
|
|
|
|
/* Add field to tree */
|
|
proto_tree_add_uint(sub_tree, hf_rtsp_status, tvb,
|
|
offset + (status_start - data),
|
|
status - status_start, status_i);
|
|
}
|
|
|
|
static void
|
|
dissect_rtsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
int len;
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) != 0) {
|
|
len = (tvb_get_guint8(tvb, offset) == RTSP_FRAMEHDR)
|
|
? dissect_rtspinterleaved(tvb, offset, pinfo, tree)
|
|
: dissect_rtspmessage(tvb, offset, pinfo, tree);
|
|
if (len == -1)
|
|
break;
|
|
offset += len;
|
|
|
|
/*
|
|
* OK, we've set the Protocol and Info columns for the
|
|
* first RTSP message; make the columns non-writable,
|
|
* so that we don't change it for subsequent RTSP messages.
|
|
*/
|
|
col_set_writable(pinfo->cinfo, FALSE);
|
|
}
|
|
}
|
|
|
|
void
|
|
proto_register_rtsp(void)
|
|
{
|
|
static gint *ett[] = {
|
|
&ett_rtspframe,
|
|
&ett_rtsp,
|
|
&ett_rtsp_method,
|
|
};
|
|
static hf_register_info hf[] = {
|
|
{ &hf_rtsp_request,
|
|
{ "Request", "rtsp.request", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_response,
|
|
{ "Response", "rtsp.response", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_method,
|
|
{ "Method", "rtsp.method", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_content_type,
|
|
{ "Content-type", "rtsp.content-type", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_content_length,
|
|
{ "Content-length", "rtsp.content-length", FT_UINT32, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_url,
|
|
{ "URL", "rtsp.url", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_status,
|
|
{ "Status", "rtsp.status", FT_UINT32, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_session,
|
|
{ "Session", "rtsp.session", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_transport,
|
|
{ "Transport", "rtsp.transport", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_rdtfeaturelevel,
|
|
{ "RDTFeatureLevel", "rtsp.rdt-feature-level", FT_UINT32, BASE_DEC, NULL, 0,
|
|
"", HFILL }},
|
|
{ &hf_rtsp_X_Vig_Msisdn,
|
|
{ "X-Vig-Msisdn", "X_Vig_Msisdn", FT_STRING, BASE_NONE, NULL, 0,
|
|
"", HFILL }},
|
|
|
|
|
|
};
|
|
module_t *rtsp_module;
|
|
|
|
proto_rtsp = proto_register_protocol("Real Time Streaming Protocol",
|
|
"RTSP", "rtsp");
|
|
proto_register_field_array(proto_rtsp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* Register our configuration options, particularly our ports */
|
|
|
|
rtsp_module = prefs_register_protocol(proto_rtsp, proto_reg_handoff_rtsp);
|
|
prefs_register_uint_preference(rtsp_module, "tcp.port",
|
|
"RTSP TCP Port",
|
|
"Set the TCP port for RTSP messages",
|
|
10, &global_rtsp_tcp_port);
|
|
prefs_register_uint_preference(rtsp_module, "tcp.alternate_port",
|
|
"Alternate RTSP TCP Port",
|
|
"Set the alternate TCP port for RTSP messages",
|
|
10, &global_rtsp_tcp_alternate_port);
|
|
prefs_register_bool_preference(rtsp_module, "desegment_headers",
|
|
"Reassemble RTSP headers spanning multiple TCP segments",
|
|
"Whether the RTSP dissector should reassemble headers "
|
|
"of a request spanning multiple TCP segments. "
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&rtsp_desegment_headers);
|
|
prefs_register_bool_preference(rtsp_module, "desegment_body",
|
|
"Trust the \"Content-length:\" header and\ndesegment RTSP "
|
|
"bodies\nspanning multiple TCP segments",
|
|
"Whether the RTSP dissector should use the "
|
|
"\"Content-length:\" value to desegment the body "
|
|
"of a request spanning multiple TCP segments",
|
|
&rtsp_desegment_body);
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_rtsp(void)
|
|
{
|
|
dissector_handle_t rtsp_handle;
|
|
static int rtsp_prefs_initialized = FALSE;
|
|
|
|
rtsp_handle = create_dissector_handle(dissect_rtsp, proto_rtsp);
|
|
|
|
if (!rtsp_prefs_initialized) {
|
|
rtsp_prefs_initialized = TRUE;
|
|
}
|
|
else {
|
|
dissector_delete("tcp.port", tcp_port, rtsp_handle);
|
|
dissector_delete("tcp.port", tcp_alternate_port, rtsp_handle);
|
|
}
|
|
/* Set our port number for future use */
|
|
|
|
tcp_port = global_rtsp_tcp_port;
|
|
tcp_alternate_port = global_rtsp_tcp_alternate_port;
|
|
|
|
dissector_add("tcp.port", tcp_port, rtsp_handle);
|
|
dissector_add("tcp.port", tcp_alternate_port, rtsp_handle);
|
|
|
|
sdp_handle = find_dissector("sdp");
|
|
rtp_handle = find_dissector("rtp");
|
|
rtcp_handle = find_dissector("rtcp");
|
|
rdt_handle = find_dissector("rdt");
|
|
}
|