forked from osmocom/wireshark
![Gilbert Ramirez](/assets/img/avatar_default.png)
Also move ncp222.py, x11-fields, process-x11-fields.pl, make-reg-dotc, and make-reg-dotc.py. Adjust #include lines in files that include packet-*.h files. svn path=/trunk/; revision=11410
241 lines
5.7 KiB
C
241 lines
5.7 KiB
C
/* packet-rtp-events.c
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*
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* Routines for RFC 2833 RTP Events dissection
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* Copyright 2003, Kevin A. Noll <knoll[AT]poss.com>
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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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/*
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* This dissector tries to dissect RTP Events.
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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 "prefs.h"
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#include <stdio.h>
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#include <string.h>
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#include "packet-rtp-events.h"
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/* rtp_event_payload_type_value is the value used globally
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to set the appropriate payload type
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saved_pt_value is a temporary place to save the value
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so we can properly reinitialize when the settings
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get changed
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*/
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static guint rtp_event_payload_type_value = 101;
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static guint saved_payload_type_value;
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/* RTP Event Fields */
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static int proto_rtp_events = -1;
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static int hf_rtp_events_event = -1; /* one byte */
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static int hf_rtp_events_end = -1; /* one bit */
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static int hf_rtp_events_reserved = -1; /* one bit */
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static int hf_rtp_events_volume = -1; /* six bits */
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static int hf_rtp_events_duration = -1; /* sixteen bits */
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/* RTP Events fields defining a subtree */
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static gint ett_rtp_events = -1;
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void
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proto_reg_handoff_rtp_events(void);
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static void
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dissect_rtp_events( 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 *rtp_events_tree = NULL;
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unsigned int offset = 0;
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guint8 rtp_evt;
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guint8 octet;
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if ( check_col( pinfo->cinfo, COL_PROTOCOL ) )
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{
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col_set_str( pinfo->cinfo, COL_PROTOCOL, "RTP EVENT" );
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}
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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/* Get event fields */
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rtp_evt = tvb_get_guint8(tvb, offset );
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if ( check_col( pinfo->cinfo, COL_INFO) )
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{
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col_add_fstr( pinfo->cinfo, COL_INFO,
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"Payload type=RTP Event, %s",
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val_to_str( rtp_evt, rtp_event_type_values, "Unknown (%u)" ));
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}
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if ( tree )
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{
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ti = proto_tree_add_item( tree, proto_rtp_events, tvb, offset, -1, FALSE );
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rtp_events_tree = proto_item_add_subtree( ti, ett_rtp_events );
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proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_event, tvb, offset, 1, rtp_evt);
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octet = tvb_get_guint8(tvb, offset +1 );
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proto_tree_add_boolean (rtp_events_tree, hf_rtp_events_end, tvb, offset+1, 1, octet);
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proto_tree_add_boolean (rtp_events_tree, hf_rtp_events_reserved, tvb, offset+1, 1, octet);
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proto_tree_add_uint ( rtp_events_tree, hf_rtp_events_volume, tvb, offset+1, 1, octet);
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proto_tree_add_item ( rtp_events_tree, hf_rtp_events_duration, tvb, offset+2, 2, FALSE);
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/* Make end-of-event packets obvious in the info column */
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if ((octet & 0x80) && check_col(pinfo->cinfo, COL_INFO))
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{
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col_append_str(pinfo->cinfo, COL_INFO, " (end)");
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}
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}
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}
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void
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proto_register_rtp_events(void)
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{
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module_t *rtp_events_module;
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static hf_register_info hf[] =
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{
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{
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&hf_rtp_events_event,
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{
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"Event ID",
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"rtpevent.event_id",
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FT_UINT8,
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BASE_DEC,
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VALS(rtp_event_type_values),
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0x0,
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"", HFILL
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}
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},
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{
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&hf_rtp_events_end,
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{
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"End of Event",
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"rtpevent.end_of_event",
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FT_BOOLEAN,
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8,
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NULL,
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0x80,
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"", HFILL
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}
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},
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{
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&hf_rtp_events_reserved,
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{
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"Reserved",
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"rtpevent.reserved",
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FT_BOOLEAN,
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8,
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NULL,
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0x40,
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"", HFILL
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}
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},
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{
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&hf_rtp_events_volume,
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{
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"Volume",
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"rtpevent.volume",
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FT_UINT8,
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BASE_DEC,
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NULL,
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0x3F,
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"", HFILL
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}
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},
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{
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&hf_rtp_events_duration,
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{
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"Event Duration",
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"rtpevent.duration",
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FT_UINT16,
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BASE_DEC,
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NULL,
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0x0,
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"", HFILL
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}
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},
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};
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static gint *ett[] =
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{
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&ett_rtp_events,
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};
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proto_rtp_events = proto_register_protocol("RFC 2833 RTP Event", "RTP Event", "rtpevent");
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proto_register_field_array(proto_rtp_events, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register preferences */
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rtp_events_module = prefs_register_protocol (proto_rtp_events, proto_reg_handoff_rtp_events);
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prefs_register_uint_preference (rtp_events_module,
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"event_payload_type_value", "Payload Type for RFC2833 RTP Events",
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"This is the value of the Payload Type field"
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"that specifies RTP Events", 10,
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&rtp_event_payload_type_value);
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}
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void
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proto_reg_handoff_rtp_events(void)
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{
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static dissector_handle_t rtp_events_handle;
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static int rtp_events_prefs_initialized = FALSE;
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if (!rtp_events_prefs_initialized) {
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rtp_events_handle = create_dissector_handle(dissect_rtp_events, proto_rtp_events);
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rtp_events_prefs_initialized = TRUE;
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}
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else {
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dissector_delete("rtp.pt", saved_payload_type_value, rtp_events_handle);
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}
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saved_payload_type_value = rtp_event_payload_type_value;
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/* rtp_event_payload_type_value is set from preferences */
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dissector_add("rtp.pt", saved_payload_type_value, rtp_events_handle);
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}
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