![Bill Meier](/assets/img/avatar_default.png)
- when the text parameter is constant col_add_str() and col_set_str() are equivalent but col_set_str() is faster. - same for replace col_append_fstr and col_append_str - remove col_clear() when it's redundant: + before a col_set/col_add if the dissector can't throw an exception. - replace col_append() after a col_clear() with faster col_add... or col_set https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9344 svn path=/trunk/; revision=52948
544 lines
16 KiB
C
544 lines
16 KiB
C
/* packet-applemidi.c
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* Routines for dissection of Apple network-midi session establishment.
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* Copyright 2006-2012, Tobias Erichsen <t.erichsen@gmx.de>
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*
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* $Id$
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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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* Copied from packet-data.c, README.developer, and various other files.
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*
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* Apple network-midi session establishment is a lightweight protocol for
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* providing a simple session establishment for MIDI-data sent in the form
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* of RTP-MIDI (RFC 4695 / 6295). Peers recognize each other using the
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* Apple Bonjour scheme with the service-name "_apple-midi._udp", establish
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* a connection using AppleMIDI (no official name, just an abbreviation)
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* and then send payload using RTP-MIDI. The implementation of this
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* dissector is based on the Apple implementation summary from May 6th, 2005
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* and the extension from August 13th, 2010.
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*
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* 2010-11-29
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* - initial version of dissector
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* 2012-02-24
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* - implemented dynamic payloadtype support to automatically punt
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* the decoding to the RTP-MIDI dissector via the RTP dissector
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* - added new bitrate receive limit feature
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*
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* Here are some links:
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*
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* http://www.cs.berkeley.edu/~lazzaro/rtpmidi/
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* http://www.faqs.org/rfcs/rfc4695.html
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* http://www.faqs.org/rfcs/rfc6295.html
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/wmem/wmem.h>
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#include <epan/conversation.h>
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#include "packet-rtp.h"
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void proto_register_applemidi(void);
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void proto_reg_handoff_applemidi(void);
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/* Definitions for protocol name during dissector-register */
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#define APPLEMIDI_DISSECTOR_NAME "Apple Network-MIDI Session Protocol"
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#define APPLEMIDI_DISSECTOR_SHORTNAME "AppleMIDI"
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#define APPLEMIDI_DISSECTOR_ABBREVIATION "applemidi"
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/* Signature "Magic Value" for Apple network MIDI session establishment */
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#define APPLEMIDI_PROTOCOL_SIGNATURE 0xffff
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/* Apple network MIDI valid commands */
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#define APPLEMIDI_COMMAND_INVITATION 0x494e /* "IN" */
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#define APPLEMIDI_COMMAND_INVITATION_REJECTED 0x4e4f /* "NO" */
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#define APLLEMIDI_COMMAND_INVITATION_ACCEPTED 0x4f4b /* "OK" */
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#define APPLEMIDI_COMMAND_ENDSESSION 0x4259 /* "BY" */
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#define APPLEMIDI_COMMAND_SYNCHRONIZATION 0x434b /* "CK" */
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#define APPLEMIDI_COMMAND_RECEIVER_FEEDBACK 0x5253 /* "RS" */
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#define APPLEMIDI_COMMAND_BITRATE_RECEIVE_LIMIT 0x524c /* "RL" */
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static int hf_applemidi_signature = -1;
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static int hf_applemidi_command = -1;
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static int hf_applemidi_protocol_version = -1;
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static int hf_applemidi_token = -1;
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static int hf_applemidi_ssrc = -1;
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static int hf_applemidi_name = -1;
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static int hf_applemidi_count = -1;
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static int hf_applemidi_padding = -1;
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static int hf_applemidi_timestamp1 = -1;
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static int hf_applemidi_timestamp2 = -1;
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static int hf_applemidi_timestamp3 = -1;
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static int hf_applemidi_sequence_num = -1;
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static int hf_applemidi_rtp_sequence_num = -1;
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static int hf_applemidi_rtp_bitrate_limit = -1;
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static int hf_applemidi_unknown_data = -1;
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static gint ett_applemidi = -1;
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static gint ett_applemidi_seq_num = -1;
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static const value_string applemidi_commands[] = {
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{ APPLEMIDI_COMMAND_INVITATION, "Invitation" },
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{ APPLEMIDI_COMMAND_INVITATION_REJECTED, "Invitation Rejected" },
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{ APLLEMIDI_COMMAND_INVITATION_ACCEPTED, "Invitation Accepted" },
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{ APPLEMIDI_COMMAND_ENDSESSION, "End Session" },
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{ APPLEMIDI_COMMAND_SYNCHRONIZATION, "Synchronization" },
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{ APPLEMIDI_COMMAND_RECEIVER_FEEDBACK, "Receiver Feedback" },
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{ APPLEMIDI_COMMAND_BITRATE_RECEIVE_LIMIT, "Bitrate Receive Limit" },
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{ 0, NULL },
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};
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static int proto_applemidi = -1;
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static dissector_handle_t applemidi_handle;
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static dissector_handle_t rtp_handle;
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static const char applemidi_unknown_command[] = "unknown command: 0x%04x";
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static void
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dissect_applemidi_common( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint16 command ) {
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guint16 seq_num;
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guint8 count;
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guint8 *name;
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gint offset = 0;
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gint len;
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gint string_size;
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proto_tree *applemidi_tree;
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proto_tree *applemidi_tree_seq_num;
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col_set_str( pinfo->cinfo, COL_PROTOCOL, APPLEMIDI_DISSECTOR_SHORTNAME );
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col_add_fstr( pinfo->cinfo, COL_INFO, "%s", val_to_str( command, applemidi_commands, applemidi_unknown_command ) );
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if ( tree ) {
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proto_item *ti;
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ti = proto_tree_add_item( tree, proto_applemidi, tvb, 0, -1, ENC_NA );
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applemidi_tree = proto_item_add_subtree( ti, ett_applemidi );
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proto_tree_add_item( applemidi_tree, hf_applemidi_signature, tvb, offset, 2, ENC_BIG_ENDIAN );
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offset += 2;
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proto_tree_add_item( applemidi_tree, hf_applemidi_command, tvb, offset, 2, ENC_BIG_ENDIAN );
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offset += 2;
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/* the format of packets for "IN", "NO", "OK" and "BY" is identical and contains
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* the protocol version, a random number generated by the initiator of the session,
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* the SSRC that is used by the respective sides RTP-entity and optionally the
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* name of the participant */
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if ( ( APPLEMIDI_COMMAND_INVITATION == command ) ||
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( APPLEMIDI_COMMAND_INVITATION_REJECTED == command ) ||
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( APLLEMIDI_COMMAND_INVITATION_ACCEPTED == command ) ||
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( APPLEMIDI_COMMAND_ENDSESSION == command ) ) {
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proto_tree_add_item( applemidi_tree, hf_applemidi_protocol_version, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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proto_tree_add_item( applemidi_tree, hf_applemidi_token, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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proto_tree_add_item( applemidi_tree, hf_applemidi_ssrc, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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len = tvb_reported_length(tvb) - offset;
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/* Name is optional */
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if ( len > 0 ) {
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name = tvb_get_string( wmem_packet_scope(), tvb, offset, len );
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string_size = (gint)( strlen( name ) + 1 );
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proto_tree_add_item( applemidi_tree, hf_applemidi_name, tvb, offset, string_size, ENC_UTF_8|ENC_NA );
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col_append_fstr( pinfo->cinfo, COL_INFO, ": peer = \"%s\"", name );
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offset += string_size;
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}
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/* the synchronization packet contains three 64bit timestamps, and a value to define how
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* many of the timestamps transmitted are valid */
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} else if ( APPLEMIDI_COMMAND_SYNCHRONIZATION == command ) {
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proto_tree_add_item( applemidi_tree, hf_applemidi_ssrc, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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count = tvb_get_guint8( tvb, offset );
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proto_tree_add_item( applemidi_tree, hf_applemidi_count, tvb, offset, 1, ENC_BIG_ENDIAN );
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col_append_fstr( pinfo->cinfo, COL_INFO, ": count = %u", count );
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offset += 1;
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proto_tree_add_item( applemidi_tree, hf_applemidi_padding, tvb, offset, 3, ENC_BIG_ENDIAN );
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offset += 3;
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proto_tree_add_item( applemidi_tree, hf_applemidi_timestamp1, tvb, offset, 8, ENC_BIG_ENDIAN );
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offset += 8;
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proto_tree_add_item( applemidi_tree, hf_applemidi_timestamp2, tvb, offset, 8, ENC_BIG_ENDIAN );
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offset += 8;
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proto_tree_add_item( applemidi_tree, hf_applemidi_timestamp3, tvb, offset, 8, ENC_BIG_ENDIAN );
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offset += 8;
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/* With the receiver feedback packet, the recipient can tell the sender up to what sequence
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* number in the RTP-stream the packets have been received; this can be used to shorten the
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* recovery-journal-section in the RTP-session */
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} else if ( APPLEMIDI_COMMAND_RECEIVER_FEEDBACK == command ) {
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proto_tree_add_item( applemidi_tree, hf_applemidi_ssrc, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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ti = proto_tree_add_item( applemidi_tree, hf_applemidi_sequence_num, tvb, offset, 4, ENC_BIG_ENDIAN );
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/* Apple includes a 32bit sequence-number, but the RTP-packet only specifies 16bit.
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* this subtree and subitem are added to be able to associate the sequence-number
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* here easier with the one specified in the corresponding RTP-packet */
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applemidi_tree_seq_num = proto_item_add_subtree( ti, ett_applemidi_seq_num );
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seq_num = tvb_get_ntohs( tvb, offset );
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proto_tree_add_uint( applemidi_tree_seq_num, hf_applemidi_rtp_sequence_num, tvb, offset, 2, seq_num );
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offset += 4;
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col_append_fstr( pinfo->cinfo, COL_INFO, ": seq = %u", seq_num );
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/* With the bitrate receive limit packet, the recipient can tell the sender to limit
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the transmission to a certain bitrate. This is important if the peer is a gateway
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to a hardware-device that only supports a certain speed. Like the MIDI 1.0 DIN-cable
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MIDI-implementation which is limited to 31250. */
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} else if ( APPLEMIDI_COMMAND_BITRATE_RECEIVE_LIMIT == command ) {
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proto_tree_add_item( applemidi_tree, hf_applemidi_ssrc, tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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proto_tree_add_item( applemidi_tree, hf_applemidi_rtp_bitrate_limit,
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tvb, offset, 4, ENC_BIG_ENDIAN );
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offset += 4;
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}
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/* If there is any remaining data (possibly because an unknown command was encountered),
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* we just dump it here */
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len = tvb_length_remaining( tvb, offset );
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if ( len > 0 ) {
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proto_tree_add_item( applemidi_tree, hf_applemidi_unknown_data, tvb, offset, len, ENC_NA );
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}
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}
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}
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static gboolean
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test_applemidi(tvbuff_t *tvb, guint16 *command_p, gboolean conversation_established ) {
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*command_p = 0xffff;
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/* An applemidi session protocol UDP-packet must start with the "magic value" of 0xffff ... */
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if ( APPLEMIDI_PROTOCOL_SIGNATURE != tvb_get_ntohs( tvb, 0 ) )
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return FALSE;
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*command_p = tvb_get_ntohs( tvb, 2 );
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/* If the conversation is establised (one prior packet with a valid known command)
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* we won't check the commands anymore - this way we still show new commands
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* Apple might introduct as "unknown" instead of punting to RTP-dissector */
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if ( conversation_established ) {
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return TRUE;
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}
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/* ... followed by packet-command: "IN", "NO", "OK", "BY", "CK" and "RS" and "RL" */
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if ( ( APPLEMIDI_COMMAND_INVITATION == *command_p ) ||
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( APPLEMIDI_COMMAND_INVITATION_REJECTED == *command_p ) ||
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( APLLEMIDI_COMMAND_INVITATION_ACCEPTED == *command_p ) ||
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( APPLEMIDI_COMMAND_ENDSESSION == *command_p ) ||
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( APPLEMIDI_COMMAND_SYNCHRONIZATION == *command_p ) ||
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( APPLEMIDI_COMMAND_RECEIVER_FEEDBACK == *command_p ) ||
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( APPLEMIDI_COMMAND_BITRATE_RECEIVE_LIMIT == *command_p ) )
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return TRUE;
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return FALSE;
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}
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/* dissect_applemidi() is called when a packet is seen from a previously identified applemidi conversation */
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/* If the packet isn't a valid applemidi packet, assume it's an RTP-MIDI packet. */
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static void
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dissect_applemidi( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree ) {
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guint16 command;
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if ( test_applemidi( tvb, &command, TRUE ) )
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dissect_applemidi_common( tvb, pinfo, tree, command );
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else
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call_dissector( rtp_handle, tvb, pinfo, tree );
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}
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static gboolean
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dissect_applemidi_heur( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_ ) {
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guint16 command;
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conversation_t *p_conv;
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/*struct _rtp_conversation_info *p_conv_data = NULL;*/
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encoding_name_and_rate_t *encoding_name_and_rate = NULL;
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GHashTable *rtp_dyn_payload = NULL;
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gint *key;
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if ( tvb_length( tvb ) < 4)
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return FALSE; /* not enough bytes to check */
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if ( !test_applemidi( tvb, &command, FALSE ) ) {
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return FALSE;
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}
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/* set dynamic payload-type 97 which is used by Apple for their RTP-MIDI implementation for this
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address/port-tuple to cause RTP-dissector to call the RTP-MIDI-dissector for payload-decoding */
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encoding_name_and_rate = wmem_new(wmem_file_scope(), encoding_name_and_rate_t);
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rtp_dyn_payload = g_hash_table_new( g_int_hash, g_int_equal );
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encoding_name_and_rate->encoding_name = wmem_strdup( wmem_file_scope(), "rtp-midi" );
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encoding_name_and_rate->sample_rate = 10000;
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key = wmem_new(wmem_file_scope(), gint);
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*key = 97;
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g_hash_table_insert( rtp_dyn_payload, key, encoding_name_and_rate );
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rtp_add_address( pinfo, &pinfo->src, pinfo->srcport, 0, APPLEMIDI_DISSECTOR_SHORTNAME,
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pinfo->fd->num, FALSE, rtp_dyn_payload);
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/* call dissect_applemidi() from now on for UDP packets on this "connection"
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it is important to do this step after calling rtp_add_address, otherwise
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all further packets will go directly to the RTP-dissector! */
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p_conv = find_or_create_conversation(pinfo);
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conversation_set_dissector( p_conv, applemidi_handle );
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/* punt to actual decoding */
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dissect_applemidi_common( tvb, pinfo, tree, command );
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return TRUE;
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}
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void
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proto_register_applemidi( void )
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{
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static hf_register_info hf[] = {
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{
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&hf_applemidi_signature,
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{
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"Signature",
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"applemidi.signature",
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FT_UINT16,
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BASE_HEX,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_command,
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{
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"Command",
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"applemidi.command",
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FT_UINT16,
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BASE_HEX,
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VALS( applemidi_commands ),
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_protocol_version,
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{
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"Protocol Version",
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"applemidi.protocol_version",
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FT_UINT32,
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BASE_DEC,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_token,
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{
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"Initiator Token",
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"applemidi.initiator_token",
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FT_UINT32,
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BASE_HEX,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_ssrc,
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{
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"Sender SSRC",
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"applemidi.sender_ssrc",
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FT_UINT32,
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BASE_HEX,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_name,
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{
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"Name",
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"applemidi.name",
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FT_STRING,
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BASE_NONE,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_count,
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{
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"Count",
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"applemidi.count",
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FT_UINT8,
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BASE_DEC,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_padding,
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{
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"Padding",
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"applemidi.padding",
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FT_UINT24,
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BASE_HEX,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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{
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&hf_applemidi_timestamp1,
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{
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"Timestamp 1",
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"applemidi.timestamp1",
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FT_UINT64,
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BASE_HEX,
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NULL,
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0x0,
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NULL, HFILL
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}
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},
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|
{
|
|
&hf_applemidi_timestamp2,
|
|
{
|
|
"Timestamp 2",
|
|
"applemidi.timestamp2",
|
|
FT_UINT64,
|
|
BASE_HEX,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_applemidi_timestamp3,
|
|
{
|
|
"Timestamp 3",
|
|
"applemidi.timestamp3",
|
|
FT_UINT64,
|
|
BASE_HEX,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_applemidi_sequence_num,
|
|
{
|
|
"Sequence Number",
|
|
"applemidi.sequence_number",
|
|
FT_UINT32,
|
|
BASE_HEX,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_applemidi_rtp_sequence_num,
|
|
{
|
|
"RTP Sequence Number",
|
|
"applemidi.rtp_sequence_number",
|
|
FT_UINT16,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_applemidi_rtp_bitrate_limit,
|
|
{
|
|
"Bitrate limit",
|
|
"applemidi.bitrate_limit",
|
|
FT_UINT32,
|
|
BASE_DEC,
|
|
NULL,
|
|
0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_applemidi_unknown_data,
|
|
{
|
|
"Unknown Data",
|
|
"applemidi.unknown_data",
|
|
FT_BYTES,
|
|
BASE_NONE,
|
|
NULL,
|
|
0x00,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
};
|
|
|
|
|
|
static gint *ett[] = {
|
|
&ett_applemidi,
|
|
&ett_applemidi_seq_num
|
|
};
|
|
|
|
proto_applemidi = proto_register_protocol( APPLEMIDI_DISSECTOR_NAME,
|
|
APPLEMIDI_DISSECTOR_SHORTNAME,
|
|
APPLEMIDI_DISSECTOR_ABBREVIATION );
|
|
proto_register_field_array( proto_applemidi, hf, array_length( hf ) );
|
|
proto_register_subtree_array( ett, array_length( ett ) );
|
|
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_applemidi( void ) {
|
|
|
|
|
|
applemidi_handle = create_dissector_handle( dissect_applemidi, proto_applemidi );
|
|
|
|
/* If we cannot decode the data it will be RTP-MIDI since the Apple session protocol uses
|
|
* two ports: the control-port and the MIDI-port. On both ports an invitation is being sent.
|
|
* The second port is then used for the RTP-MIDI-data. So if we can't find valid AppleMidi
|
|
* packets, it will be most likely RTP-MIDI...
|
|
*/
|
|
rtp_handle = find_dissector( "rtp" );
|
|
heur_dissector_add( "udp", dissect_applemidi_heur, proto_applemidi );
|
|
|
|
}
|