forked from osmocom/wireshark
Add new dissector for uRTP protocol (internal, not to be submitted)
This commit is contained in:
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5134a08c9b
commit
fd9e1bb11a
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@ -73,6 +73,7 @@ DIRTY_PIDL_DISSECTOR_SRC = \
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packet-gsm_abis_om2000.c \
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packet-gsm_sim.c \
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packet-card_app_toolkit.c \
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packet-urtp.c \
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packet-dcerpc-winreg.c
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#
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@ -0,0 +1,581 @@
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/* packet-rtp.c
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*
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* Routines for uRTP dissection
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* uRTP = micro Real time Transport Protocol
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*
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* Copyright 2011, Harald Welte <laforge@gnumonks.org>
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*
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* $Id: packet-urtp.c 35883 2011-02-09 02:27:41Z morriss $
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <stdio.h>
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#include "packet-rtp.h"
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#include <epan/rtp_pt.h>
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#include <epan/conversation.h>
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#include <epan/reassemble.h>
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#include <epan/tap.h>
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#include <epan/prefs.h>
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#include <epan/emem.h>
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#include <epan/strutil.h>
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static dissector_handle_t urtp_handle;
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static int urtp_tap = -1;
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/* uRTP header fields */
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static int proto_urtp = -1;
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static int hf_urtp_marker = -1;
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static int hf_urtp_payload_type = -1;
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static int hf_urtp_timestamp = -1;
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static int hf_urtp_num_frames = -1;
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static int hf_urtp_ssrc = -1;
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static int hf_urtp_data = -1;
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/* uRTP fields defining a sub tree */
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static gint ett_urtp = -1;
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/* Forward declaration we need below */
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void proto_reg_handoff_urtp(void);
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static dissector_handle_t data_handle;
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static dissector_handle_t amr_handle;
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static const value_string urtp_payload_type_vals[] =
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{
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{ 0, NULL },
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};
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value_string_ext urtp_payload_type_vals_ext = VALUE_STRING_EXT_INIT(urtp_payload_type_vals);
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#if 0
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/*
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* Process the payload of the RTP packet, hand it to the subdissector
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*/
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static void
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process_rtp_payload(tvbuff_t *newtvb, packet_info *pinfo, proto_tree *tree,
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proto_tree *rtp_tree,
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unsigned int payload_type)
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{
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struct _rtp_conversation_info *p_conv_data = NULL;
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gboolean found_match = FALSE;
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int payload_len;
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struct srtp_info *srtp_info;
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int offset=0;
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payload_len = tvb_length_remaining(newtvb, offset);
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/* first check if this is added as an SRTP stream - if so, don't try to dissector the payload data for now */
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p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
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if (p_conv_data && p_conv_data->srtp_info) {
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srtp_info = p_conv_data->srtp_info;
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payload_len -= srtp_info->mki_len + srtp_info->auth_tag_len;
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#if 0
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#error Currently the srtp_info structure contains no cypher data, see packet-sdp.c adding dummy_srtp_info structure
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if (p_conv_data->srtp_info->encryption_algorithm==SRTP_ENC_ALG_NULL) {
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if (rtp_tree)
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proto_tree_add_text(rtp_tree, newtvb, offset, payload_len, "SRTP Payload with NULL encryption");
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}
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else
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#endif
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{
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if (rtp_tree)
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proto_tree_add_item(rtp_tree, hf_srtp_encrypted_payload, newtvb, offset, payload_len, FALSE);
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found_match = TRUE; /* use this flag to prevent dissection below */
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}
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offset += payload_len;
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if (srtp_info->mki_len) {
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proto_tree_add_item(rtp_tree, hf_srtp_mki, newtvb, offset, srtp_info->mki_len, FALSE);
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offset += srtp_info->mki_len;
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}
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if (srtp_info->auth_tag_len) {
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proto_tree_add_item(rtp_tree, hf_srtp_auth_tag, newtvb, offset, srtp_info->auth_tag_len, FALSE);
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offset += srtp_info->auth_tag_len;
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}
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}
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/* if the payload type is dynamic, we check if the conv is set and we look for the pt definition */
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else if ( (payload_type >= PT_UNDF_96 && payload_type <= PT_UNDF_127) ) {
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if (p_conv_data && p_conv_data->rtp_dyn_payload) {
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gchar *payload_type_str = NULL;
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encoding_name_and_rate_t *encoding_name_and_rate_pt = NULL;
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encoding_name_and_rate_pt = g_hash_table_lookup(p_conv_data->rtp_dyn_payload, &payload_type);
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if (encoding_name_and_rate_pt) {
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payload_type_str = encoding_name_and_rate_pt->encoding_name;
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}
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if (payload_type_str){
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found_match = dissector_try_string(rtp_dyn_pt_dissector_table,
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payload_type_str, newtvb, pinfo, tree);
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/* If payload type string set from conversation and
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* no matching dissector found it's probably because no subdissector
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* exists. Don't call the dissectors based on payload number
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* as that'd probably be the wrong dissector in this case.
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* Just add it as data.
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*/
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if(found_match==FALSE)
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proto_tree_add_item( rtp_tree, hf_rtp_data, newtvb, 0, -1, FALSE );
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return;
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}
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}
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}
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/* if we don't found, it is static OR could be set static from the preferences */
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if (!found_match && !dissector_try_uint(rtp_pt_dissector_table, payload_type, newtvb, pinfo, tree))
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proto_tree_add_item( rtp_tree, hf_rtp_data, newtvb, 0, -1, FALSE );
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}
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/* Rtp payload reassembly
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*
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* This handles the reassembly of PDUs for higher-level protocols.
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*
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* We're a bit limited on how we can cope with out-of-order packets, because
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* we don't have any idea of where the datagram boundaries are. So if we see
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* packets A, C, B (all of which comprise a single datagram), we cannot know
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* that C should be added to the same datagram as A, until we come to B (which
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* may or may not actually be present...).
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*
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* What we end up doing in this case is passing A+B to the subdissector as one
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* datagram, and make out that a new one starts on C.
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*/
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static void
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dissect_rtp_data( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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proto_tree *rtp_tree, int offset, unsigned int data_len,
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unsigned int data_reported_len,
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unsigned int payload_type )
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{
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tvbuff_t *newtvb;
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struct _rtp_conversation_info *p_conv_data= NULL;
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gboolean must_desegment = FALSE;
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rtp_private_conv_info *finfo = NULL;
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rtp_multisegment_pdu *msp = NULL;
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guint32 seqno;
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/* Retrieve RTPs idea of a converation */
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p_conv_data = p_get_proto_data(pinfo->fd, proto_rtp);
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if(p_conv_data != NULL)
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finfo = p_conv_data->rtp_conv_info;
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if(finfo == NULL || !desegment_rtp) {
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/* Hand the whole lot off to the subdissector */
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newtvb=tvb_new_subset(tvb,offset,data_len,data_reported_len);
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process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
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return;
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}
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seqno = p_conv_data->extended_seqno;
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pinfo->can_desegment = 2;
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pinfo->desegment_offset = 0;
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pinfo->desegment_len = 0;
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#ifdef DEBUG_FRAGMENTS
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g_debug("%d: RTP Part of convo %d(%p); seqno %d",
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pinfo->fd->num,
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p_conv_data->frame_number, p_conv_data,
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seqno
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);
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#endif
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/* look for a pdu which we might be extending */
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msp = (rtp_multisegment_pdu *)se_tree_lookup32_le(finfo->multisegment_pdus,seqno-1);
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if(msp && msp->startseq < seqno && msp->endseq >= seqno) {
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guint32 fid = msp->startseq;
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fragment_data *fd_head;
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tContinues fragment %d", fid);
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#endif
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/* we always assume the datagram is complete; if this is the
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* first pass, that's our best guess, and if it's not, what we
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* say gets ignored anyway.
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*/
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fd_head = fragment_add_seq(tvb, offset, pinfo, fid, fragment_table,
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seqno-msp->startseq, data_len, FALSE);
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newtvb = process_reassembled_data(tvb,offset, pinfo, "Reassembled RTP", fd_head,
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&rtp_fragment_items, NULL, tree);
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tFragment Coalesced; fd_head=%p, newtvb=%p (len %d)",fd_head, newtvb,
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newtvb?tvb_reported_length(newtvb):0);
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#endif
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if(newtvb != NULL) {
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/* Hand off to the subdissector */
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process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
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/*
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* Check to see if there were any complete fragments within the chunk
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*/
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if( pinfo->desegment_len && pinfo->desegment_offset == 0 )
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{
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tNo complete pdus in payload" );
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#endif
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/* Mark the fragments and not complete yet */
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fragment_set_partial_reassembly(pinfo, fid, fragment_table);
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/* we must need another segment */
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msp->endseq = MIN(msp->endseq,seqno) + 1;
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}
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else
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{
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/*
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* Data was dissected so add the protocol tree to the display
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*/
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proto_item *rtp_tree_item, *frag_tree_item;
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/* this nargery is to insert the fragment tree into the main tree
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* between the RTP protocol entry and the subdissector entry */
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show_fragment_tree(fd_head, &rtp_fragment_items, tree, pinfo, newtvb, &frag_tree_item);
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rtp_tree_item = proto_item_get_parent( proto_tree_get_parent( rtp_tree ));
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if( frag_tree_item && rtp_tree_item )
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proto_tree_move_item( tree, rtp_tree_item, frag_tree_item );
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if(pinfo->desegment_len)
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{
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/* the higher-level dissector has asked for some more data - ie,
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the end of this segment does not coincide with the end of a
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higher-level PDU. */
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must_desegment = TRUE;
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}
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}
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}
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}
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else
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{
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/*
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* The segment is not the continuation of a fragmented segment
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* so process it as normal
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*/
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tRTP non-fragment payload");
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#endif
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newtvb = tvb_new_subset( tvb, offset, data_len, data_reported_len );
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/* Hand off to the subdissector */
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process_rtp_payload(newtvb, pinfo, tree, rtp_tree, payload_type);
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if(pinfo->desegment_len) {
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/* the higher-level dissector has asked for some more data - ie,
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the end of this segment does not coincide with the end of a
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higher-level PDU. */
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must_desegment = TRUE;
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}
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}
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/*
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* There were bytes left over that the higher protocol couldn't dissect so save them
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*/
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if(must_desegment)
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{
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guint32 deseg_offset = pinfo->desegment_offset;
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guint32 frag_len = tvb_reported_length_remaining(newtvb, deseg_offset);
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fragment_data *fd_head = NULL;
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tRTP Must Desegment: tvb_len=%d ds_len=%d %d frag_len=%d ds_off=%d",
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tvb_reported_length(newtvb),
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pinfo->desegment_len,
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pinfo->fd->flags.visited,
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frag_len,
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deseg_offset);
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#endif
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/* allocate a new msp for this pdu */
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msp = se_alloc(sizeof(rtp_multisegment_pdu));
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msp->startseq = seqno;
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msp->endseq = seqno+1;
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se_tree_insert32(finfo->multisegment_pdus,seqno,msp);
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/*
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* Add the fragment to the fragment table
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*/
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fd_head = fragment_add_seq(newtvb,deseg_offset, pinfo, seqno, fragment_table, 0, frag_len,
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TRUE );
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if(fd_head != NULL)
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{
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if( fd_head->reassembled_in != 0 && !(fd_head->flags & FD_PARTIAL_REASSEMBLY) )
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{
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proto_item *rtp_tree_item;
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rtp_tree_item = proto_tree_add_uint( tree, hf_rtp_reassembled_in,
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newtvb, deseg_offset, tvb_reported_length_remaining(newtvb,deseg_offset),
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fd_head->reassembled_in);
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PROTO_ITEM_SET_GENERATED(rtp_tree_item);
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tReassembled in %d", fd_head->reassembled_in);
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#endif
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}
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else
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{
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tUnfinished fragment");
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#endif
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/* this fragment is never reassembled */
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proto_tree_add_text( tree, tvb, deseg_offset, -1,"RTP fragment, unfinished");
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}
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}
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else
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{
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/*
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* This fragment was the first fragment in a new entry in the
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* frag_table; we don't yet know where it is reassembled
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*/
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#ifdef DEBUG_FRAGMENTS
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g_debug("\tnew pdu");
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#endif
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}
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if( pinfo->desegment_offset == 0 )
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{
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTP");
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col_set_str(pinfo->cinfo, COL_INFO, "[RTP segment of a reassembled PDU]");
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}
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}
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pinfo->can_desegment = 0;
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pinfo->desegment_offset = 0;
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pinfo->desegment_len = 0;
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}
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#endif
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static const unsigned int amr_ft_len_bits[] = {
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[0] = 95,
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[1] = 103,
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[2] = 118,
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[3] = 134,
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[4] = 148,
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[5] = 159,
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[6] = 204,
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[7] = 244,
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[8] = 39,
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};
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static int amr_bytelen_padded(guint8 ft)
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{
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unsigned int bits;
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int bytes;
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if (ft > 8)
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return -1;
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bits = amr_ft_len_bits[ft];
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bytes = bits / 8;
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if (bits % 8)
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bytes++;
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return bytes;
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}
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static void
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dissect_urtp( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree )
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{
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proto_item *ti = NULL;
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proto_tree *urtp_tree = NULL;
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gboolean marker_set = 0;
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unsigned int payload_type;
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gchar *payload_type_str = NULL;
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unsigned int offset = 0;
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guint8 timestamp, sync_src, num_frames;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "uRTP");
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timestamp = tvb_get_guint8(tvb, offset);
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sync_src = tvb_get_guint8(tvb, offset+1);
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payload_type = tvb_get_guint8(tvb, offset+2) & 0xF;
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num_frames = tvb_get_guint8(tvb, offset+2) >> 4;
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col_add_fstr( pinfo->cinfo, COL_INFO,
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"PT=%s, SSRC=0x%X, Time=%u%s",
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payload_type_str ? payload_type_str : val_to_str_ext( payload_type, &urtp_payload_type_vals_ext,"Unknown (%u)" ),
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sync_src,
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timestamp,
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marker_set ? ", Mark " : " ");
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if ( tree ) {
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unsigned int i;
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/* Create RTP protocol tree */
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ti = proto_tree_add_item(tree, proto_urtp, tvb, offset, -1, FALSE );
|
||||
urtp_tree = proto_item_add_subtree(ti, ett_urtp );
|
||||
|
||||
proto_tree_add_item( urtp_tree, hf_urtp_timestamp, tvb,
|
||||
offset, 1, FALSE );
|
||||
proto_tree_add_item( urtp_tree, hf_urtp_ssrc, tvb,
|
||||
offset+1, 1, FALSE );
|
||||
proto_tree_add_item( urtp_tree, hf_urtp_payload_type, tvb,
|
||||
offset+2, 1, FALSE );
|
||||
proto_tree_add_item( urtp_tree, hf_urtp_num_frames, tvb,
|
||||
offset+2, 1, FALSE );
|
||||
|
||||
offset += 3;
|
||||
|
||||
for (i = 0; i < num_frames; i++) {
|
||||
guint8 oct1, ft;
|
||||
tvbuff_t *subtvb;
|
||||
int frame_len;
|
||||
|
||||
oct1 = tvb_get_guint8(tvb, offset+1);
|
||||
ft = (oct1 >> 3) & 0xF;
|
||||
frame_len = amr_bytelen_padded(ft);
|
||||
if (frame_len < 0)
|
||||
return;
|
||||
|
||||
subtvb = tvb_new_subset(tvb, offset, frame_len+2, frame_len+2);
|
||||
call_dissector(amr_handle, subtvb, pinfo, urtp_tree);
|
||||
|
||||
offset += frame_len+2;
|
||||
}
|
||||
}
|
||||
|
||||
if (!pinfo->flags.in_error_pkt)
|
||||
tap_queue_packet(urtp_tap, pinfo, NULL);
|
||||
}
|
||||
|
||||
/* Register uRTP */
|
||||
|
||||
void
|
||||
proto_register_urtp(void)
|
||||
{
|
||||
static hf_register_info hf[] =
|
||||
{
|
||||
{
|
||||
&hf_urtp_timestamp,
|
||||
{
|
||||
"Timestamp",
|
||||
"urtp.timestamp",
|
||||
FT_UINT8,
|
||||
BASE_DEC,
|
||||
NULL,
|
||||
0xFF,
|
||||
NULL, HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_urtp_ssrc,
|
||||
{
|
||||
"SSRC",
|
||||
"urtp.ssrc",
|
||||
FT_UINT8,
|
||||
BASE_HEX,
|
||||
NULL,
|
||||
0xFF,
|
||||
NULL, HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_urtp_payload_type,
|
||||
{
|
||||
"Payload Type",
|
||||
"urtp.payload_type",
|
||||
FT_UINT8,
|
||||
BASE_DEC,
|
||||
NULL,
|
||||
0x0F,
|
||||
NULL, HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_urtp_num_frames,
|
||||
{
|
||||
"Number of frames to follow",
|
||||
"urtp.number_samples",
|
||||
FT_UINT8,
|
||||
BASE_DEC,
|
||||
NULL,
|
||||
0xF0,
|
||||
NULL, HFILL
|
||||
}
|
||||
},
|
||||
{
|
||||
&hf_urtp_data,
|
||||
{
|
||||
"Payload",
|
||||
"urtp.payload",
|
||||
FT_BYTES,
|
||||
BASE_NONE,
|
||||
NULL,
|
||||
0x0,
|
||||
NULL, HFILL
|
||||
}
|
||||
},
|
||||
};
|
||||
|
||||
static gint *ett[] =
|
||||
{
|
||||
&ett_urtp,
|
||||
};
|
||||
|
||||
proto_urtp = proto_register_protocol("Micro Real-Time Transport Protocol",
|
||||
"uRTP", "urtp");
|
||||
proto_register_field_array(proto_urtp, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
|
||||
register_dissector("urtp", dissect_urtp, proto_urtp);
|
||||
|
||||
urtp_tap = register_tap("urtp");
|
||||
}
|
||||
|
||||
void
|
||||
proto_reg_handoff_urtp(void)
|
||||
{
|
||||
static gboolean urtp_prefs_initialized = FALSE;
|
||||
|
||||
if (!urtp_prefs_initialized) {
|
||||
urtp_handle = find_dissector("urtp");
|
||||
|
||||
dissector_add_handle("udp.port", urtp_handle); /* for 'decode-as' */
|
||||
//heur_dissector_add( "udp", dissect_urtp_heur, proto_urtp);
|
||||
|
||||
data_handle = find_dissector("data");
|
||||
amr_handle = find_dissector("amr");
|
||||
|
||||
urtp_prefs_initialized = TRUE;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Local Variables:
|
||||
* c-basic-offset: 8
|
||||
* indent-tabs-mode: t
|
||||
* tab-width: 8
|
||||
* End:
|
||||
*/
|
||||
Loading…
Reference in New Issue