731 lines
27 KiB
C
731 lines
27 KiB
C
/* packet-bittorrent.c
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* Routines for bittorrent packet dissection
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* Copyright (C) 2004 Jelmer Vernooij <jelmer@samba.org>
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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-pop.c
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/strutil.h>
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#include "packet-tcp.h"
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void proto_register_bittorrent(void);
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void proto_reg_handoff_bittorrent(void);
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/*
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* See
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*
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* http://bittorrent.com/protocol.html
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* http://wiki.theory.org/BitTorrentSpecification
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* http://bitconjurer.org/BitTorrent/protocol.html
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*/
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#define DEFAULT_TCP_PORT_RANGE "6881-6889" /* Not IANA registered */
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#define BITTORRENT_MESSAGE_CHOKE 0
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#define BITTORRENT_MESSAGE_UNCHOKE 1
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#define BITTORRENT_MESSAGE_INTERESTED 2
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#define BITTORRENT_MESSAGE_NOT_INTERESTED 3
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#define BITTORRENT_MESSAGE_HAVE 4
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#define BITTORRENT_MESSAGE_BITFIELD 5
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#define BITTORRENT_MESSAGE_REQUEST 6
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#define BITTORRENT_MESSAGE_PIECE 7
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#define BITTORRENT_MESSAGE_CANCEL 8
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#define BITTORRENT_MESSAGE_PORT 9
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/*
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* BitTorrent BEP 06
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* Fast Extension message type
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*
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*/
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#define BITT_FAST_EX_SUGGEST_PIECE 13
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#define BITT_FAST_EX_HAVE_ALL 14
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#define BITT_FAST_EX_HAVE_NONE 15
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#define BITT_FAST_EX_REJECT_REQUEST 16
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#define BITT_FAST_EX_ALLOWED_FAST 17
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#define BITTORRENT_MESSAGE_EXTENDED 20
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#define BITTORRENT_HEADER_LENGTH 4
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/*
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* Azureus messages are specified by name so these are made up numbers
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* for internal identification only.
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*
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* Standard BT message types are a single byte, so these won't clash
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*/
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#define AZUREUS_MESSAGE_HANDSHAKE 256
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#define AZUREUS_MESSAGE_KEEP_ALIVE 257
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#define AZUREUS_MESSAGE_BT_HANDSHAKE 258
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#define AZUREUS_MESSAGE_PEER_EXCHANGE 259
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#define AZUREUS_MESSAGE_JPC_HELLO 260
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#define AZUREUS_MESSAGE_JPC_REPLY 261
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static const value_string bittorrent_messages[] = {
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{ BITTORRENT_MESSAGE_CHOKE, "Choke" },
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{ BITTORRENT_MESSAGE_UNCHOKE, "Unchoke" },
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{ BITTORRENT_MESSAGE_INTERESTED, "Interested" },
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{ BITTORRENT_MESSAGE_NOT_INTERESTED, "Not Interested" },
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{ BITTORRENT_MESSAGE_HAVE, "Have" },
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{ BITTORRENT_MESSAGE_BITFIELD, "Bitfield" },
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{ BITTORRENT_MESSAGE_REQUEST, "Request" },
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{ BITTORRENT_MESSAGE_PIECE, "Piece" },
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{ BITTORRENT_MESSAGE_CANCEL, "Cancel" },
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{ BITTORRENT_MESSAGE_PORT, "Port" },
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{ BITT_FAST_EX_SUGGEST_PIECE, "Suggest Piece" },
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{ BITT_FAST_EX_HAVE_ALL, "Have All" },
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{ BITT_FAST_EX_HAVE_NONE, "Have None" },
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{ BITT_FAST_EX_REJECT_REQUEST, "Reject Request" },
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{ BITT_FAST_EX_ALLOWED_FAST, "Allowed Fast" },
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{ BITTORRENT_MESSAGE_EXTENDED, "Extended" },
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{ AZUREUS_MESSAGE_KEEP_ALIVE, "Keepalive" },
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{ AZUREUS_MESSAGE_HANDSHAKE, "Azureus Handshake" },
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{ AZUREUS_MESSAGE_BT_HANDSHAKE, "Azureus BitTorrent Handshake" },
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{ AZUREUS_MESSAGE_PEER_EXCHANGE, "Azureus Peer Exchange" },
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{ AZUREUS_MESSAGE_JPC_HELLO, "Azureus PeerCache Hello" },
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{ AZUREUS_MESSAGE_JPC_REPLY, "Azureus PeerCache Reply" },
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{ 0, NULL }
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};
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static const value_string azureus_priorities[] = {
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{ 0, "Low" },
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{ 1, "Normal" },
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{ 2, "High" },
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{ 0, NULL }
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};
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struct amp_message {
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const char *name;
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guint32 value;
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};
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static const struct amp_message amp_messages[] = {
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{ "BT_KEEP_ALIVE", AZUREUS_MESSAGE_KEEP_ALIVE },
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{ "BT_CHOKE", BITTORRENT_MESSAGE_CHOKE },
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{ "BT_UNCHOKE", BITTORRENT_MESSAGE_UNCHOKE },
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{ "BT_INTERESTED", BITTORRENT_MESSAGE_INTERESTED },
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{ "BT_UNINTERESTED", BITTORRENT_MESSAGE_NOT_INTERESTED },
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{ "BT_HAVE", BITTORRENT_MESSAGE_HAVE },
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{ "BT_BITFIELD", BITTORRENT_MESSAGE_BITFIELD },
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{ "BT_REQUEST", BITTORRENT_MESSAGE_REQUEST },
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{ "BT_PIECE", BITTORRENT_MESSAGE_PIECE },
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{ "BT_CANCEL", BITTORRENT_MESSAGE_CANCEL },
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{ "BT_PORT", BITTORRENT_MESSAGE_PORT },
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{ "BT_SUGGEST", BITT_FAST_EX_SUGGEST_PIECE },
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{ "BT_HAVE_ALL", BITT_FAST_EX_HAVE_ALL },
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{ "BT_HAVE_NONE", BITT_FAST_EX_HAVE_NONE },
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{ "BT_REJECT_REQUEST",BITT_FAST_EX_REJECT_REQUEST },
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{ "BT_ALLOWED_FAST", BITT_FAST_EX_ALLOWED_FAST },
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{ "BT_EXTENDED", BITTORRENT_MESSAGE_EXTENDED },
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{ "AZ_HANDSHAKE", AZUREUS_MESSAGE_HANDSHAKE },
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{ "BT_HANDSHAKE", AZUREUS_MESSAGE_BT_HANDSHAKE },
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{ "AZ_PEER_EXCHANGE", AZUREUS_MESSAGE_PEER_EXCHANGE },
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{ "JPC_HELLO", AZUREUS_MESSAGE_JPC_HELLO },
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{ "JPC_REPLY", AZUREUS_MESSAGE_JPC_REPLY },
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{ NULL, 0 }
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};
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static dissector_handle_t dissector_handle;
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static dissector_handle_t bencode_handle;
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static int proto_bittorrent = -1;
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/* static gint hf_bittorrent_field_length = -1; */
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static gint hf_bittorrent_prot_name_len = -1;
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static gint hf_bittorrent_prot_name = -1;
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static gint hf_bittorrent_reserved = -1;
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static gint hf_bittorrent_sha1_hash = -1;
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static gint hf_bittorrent_peer_id = -1;
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static gint hf_bittorrent_msg = -1;
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static gint hf_bittorrent_msg_len = -1;
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static gint hf_bittorrent_msg_type = -1;
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static gint hf_azureus_msg = -1;
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static gint hf_azureus_msg_type_len = -1;
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static gint hf_azureus_msg_type = -1;
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static gint hf_azureus_msg_prio = -1;
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static gint hf_bittorrent_bitfield_data = -1;
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static gint hf_bittorrent_piece_index = -1;
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static gint hf_bittorrent_piece_begin = -1;
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static gint hf_bittorrent_piece_length = -1;
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static gint hf_bittorrent_piece_data = -1;
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static gint hf_azureus_jpc_addrlen = -1;
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static gint hf_azureus_jpc_addr = -1;
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static gint hf_azureus_jpc_port = -1;
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static gint hf_azureus_jpc_session = -1;
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static gint hf_bittorrent_port = -1;
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static gint hf_bittorrent_extended = -1;
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static gint hf_bittorrent_continuous_data = -1;
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static gint hf_bittorrent_version = -1;
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static gint ett_bittorrent = -1;
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static gint ett_bittorrent_msg = -1;
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static gint ett_peer_id = -1;
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static gboolean bittorrent_desegment = TRUE;
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static gboolean decode_client_information = FALSE;
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struct client_information {
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char id[5]; /* string length must be <= 4 to allow space for NUL termination byte */
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char ver_len;
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const char *name; /* NULL means array entry terminates the array */
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};
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static struct client_information peer_id[] = {
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{"-AG", 4, "Ares"},
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{"-A~", 4, "Ares"},
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{"-AR", 4, "Arctic"},
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{"-AT", 4, "Artemis"},
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{"-AV", 4, "Avicora"},
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{"-AX", 4, "BitPump"},
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{"-AZ", 4, "Azureus"},
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{"-BB", 4, "BitBuddy"},
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{"-BC", 4, "BitComet"},
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{"-BF", 4, "Bitflu"},
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{"-BG", 4, "BTG (uses Rasterbar libtorrent)"},
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{"-BOW", 3, "Bits on Wheels"},
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{"-BP", 4, "BitTorrent Pro (Azereus + spyware)"},
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{"-BR", 4, "BitRocket"},
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{"-BS", 4, "BTSlave"},
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{"-BW", 4, "BitWombat"},
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{"-BX", 4, "Bittorrent X"},
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{"-CD", 4, "Enhanced CTorrent"},
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{"-CT", 4, "CTorrent"},
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{"-DE", 4, "DelugeTorrent"},
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{"-DP", 4, "Propagate Data Client"},
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{"-EB", 4, "EBit"},
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{"-ES", 4, "electric sheep"},
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{"-FC", 4, "FileCroc"},
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{"-FG", 4, "FlashGet"},
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{"-FT", 4, "FoxTorrent"},
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{"-GS", 4, "GSTorrent"},
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{"-HK", 4, "Hekate"},
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{"-HL", 4, "Halite"},
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{"-HN", 4, "Hydranode"},
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{"-KG", 4, "KGet"},
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{"-KT", 4, "KTorrent"},
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{"-LC", 4, "LeechCraft"},
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{"-LH", 4, "LH-ABC"},
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{"-LP", 4, "Lphant"},
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{"-LT", 4, "libtorrent"},
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{"-lt", 4, "libTorrent"},
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{"-LW", 4, "LimeWire"},
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{"-MO", 4, "MonoTorrent"},
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{"-MP", 4, "MooPolice"},
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{"-MR", 4, "Miro"},
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{"-MT", 4, "MoonlightTorrent"},
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{"-NE", 4, "BT Next Evolution"},
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{"-NX", 4, "Net Transport"},
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{"-OS", 4, "OneSwarm"},
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{"-OT", 4, "OmegaTorrent"},
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{"-PD", 4, "Pando"},
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{"-qB", 4, "qBittorrent"},
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{"-QD", 4, "QQDownload"},
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{"-QT", 4, "Qt 4 Torrent example"},
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{"-RT", 4, "Retriever"},
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{"-S~", 4, "Shareaza alpha/beta"},
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{"-SB", 4, "Swiftbit"},
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{"-SD", 4, "Thunder (aka XunLei)"},
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{"-SS", 4, "SwarmScope"},
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{"-ST", 4, "SymTorrent"},
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{"-st", 4, "sharktorrent"},
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{"-SZ", 4, "Shareaza"},
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{"-TN", 4, "TorrentDotNET"},
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{"-TR", 4, "Transmission"},
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{"-TS", 4, "Torrentstorm"},
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{"-TT", 4, "TuoTu"},
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{"-UL", 4, "uLeecher!"},
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{"-UM", 4, "(my)Torrent for Mac"},
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{"-UT", 4, "(my)Torrent"},
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{"-VG", 4, "Vagaa"},
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{"-WT", 4, "BitLet"},
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{"-WY", 4, "FireTorrent"},
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{"-XL", 4, "Xunlei"},
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{"-XT", 4, "XanTorrent"},
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{"-XX", 4, "Xtorrent"},
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{"-ZT", 4, "ZipTorrent"},
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{"exbc", 2, "BitComet"},
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{"OP", 4, "Opera"},
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{"QVOD", 4, "Qvod"},
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{"XBT", 3, "XBT Client"},
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{"A", 3, "ABC"},
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{"O", 3, "Osprey Permaseed"},
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{"Q", 3, "BTQueue"},
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{"R", 3, "Tribler"},
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{"S", 3, "Shadow's client"},
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{"T", 3, "BitTornado"},
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{"U", 3, "UPnP NAT Bit Torrent"},
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{"", 0, NULL}
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};
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static guint
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get_bittorrent_pdu_length(packet_info *pinfo _U_, tvbuff_t *tvb,
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int offset, void *data _U_)
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{
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guint8 type;
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guint32 length;
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if (tvb_get_guint8(tvb, offset) == 19 &&
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tvb_memeql(tvb, offset + 1, "BitTorrent protocol", 19) == 0) {
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/* Return the length of a Handshake message */
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return 1 + /* pstrlen */
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19 + /* pstr */
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8 + /* reserved */
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20 + /* SHA1 hash of the info key */
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20; /* peer id */
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} else {
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/* Try to validate the length of the message indicated by the header. */
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length = tvb_get_ntohl(tvb, offset);
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if(length == 0) {
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/* keep-alive - no message ID */
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return BITTORRENT_HEADER_LENGTH;
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}
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/* Do some sanity checking of the message, if we have the ID byte */
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if(tvb_offset_exists(tvb, offset + BITTORRENT_HEADER_LENGTH)) {
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type = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH);
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if((type <= BITTORRENT_MESSAGE_PORT || (type >= BITT_FAST_EX_SUGGEST_PIECE && type <= BITT_FAST_EX_ALLOWED_FAST) || type == BITTORRENT_MESSAGE_EXTENDED) && length<0x1000000) {
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/* This seems to be a valid BitTorrent header with a known
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type identifier */
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return BITTORRENT_HEADER_LENGTH + length;
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} else {
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/* The type is not known, so this message cannot be decoded
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properly by this dissector. We assume it's continuation
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data from the middle of a message, and just return the
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remaining length in the tvbuff so the rest of the tvbuff
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is displayed as continuation data. */
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return tvb_reported_length_remaining(tvb, offset);
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}
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} else {
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/* We don't have the type field, so we can't determine
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whether this is a valid message. For now, we assume
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it's continuation data from the middle of a message,
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and just return the remaining length in the tvbuff so
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the rest of the tvbuff is displayed as continuation
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data. */
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return tvb_reported_length_remaining(tvb, offset);
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}
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}
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}
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static void
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dissect_bittorrent_message (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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int offset = 0;
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int i;
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int isamp = 0;
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proto_tree *mtree;
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guint16 type = 0;
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guint32 typelen = 0;
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guint8 prio = 0;
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guint32 length;
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const char *msgtype = NULL;
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proto_item *ti;
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guint32 piece_index, piece_begin, piece_length;
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guint32 stringlen;
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tvbuff_t *subtvb;
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if (tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH, 1)) {
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/* Check for data from the middle of a message. */
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length = tvb_get_ntohl(tvb, offset);
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type = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH);
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if (type==BITTORRENT_MESSAGE_CHOKE && length>4) {
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/*
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* Choke messages have no payload, so this is likely an Azureus
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* Messaging Protocol packet
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*/
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if (!tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH, 4))
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return;
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typelen = tvb_get_ntohl(tvb, offset + BITTORRENT_HEADER_LENGTH);
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if (4+typelen+1<=length) {
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if (!tvb_bytes_exist(tvb, offset + BITTORRENT_HEADER_LENGTH + 4, typelen+1))
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return;
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for ( i=0 ; amp_messages[i].name ; i++ ) {
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if (strlen(amp_messages[i].name)==typelen &&
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tvb_memeql(tvb, offset + BITTORRENT_HEADER_LENGTH + 4,
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amp_messages[i].name, (int)strlen(amp_messages[i].name))==0) {
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prio = tvb_get_guint8(tvb, offset + BITTORRENT_HEADER_LENGTH + 4 + typelen);
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if (prio==0 || prio==1 || prio==2) {
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type = amp_messages[i].value;
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isamp = 1;
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}
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break;
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}
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}
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}
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}
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msgtype = try_val_to_str(type, bittorrent_messages);
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#if 0
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if (msgtype == NULL && isamp) {
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msgtype = try_val_to_str(type, azureus_messages);
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}
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#endif
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if (msgtype == NULL) {
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proto_tree_add_item(tree, hf_bittorrent_continuous_data, tvb, offset, -1, ENC_NA);
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col_set_str(pinfo->cinfo, COL_INFO, "Continuation data");
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return;
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}
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} else {
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/* not enough bytes of the header, stop here */
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return;
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}
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if (isamp) {
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ti = proto_tree_add_item(tree, hf_azureus_msg, tvb, offset, length + BITTORRENT_HEADER_LENGTH, ENC_NA);
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} else {
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ti = proto_tree_add_item(tree, hf_bittorrent_msg, tvb, offset, length + BITTORRENT_HEADER_LENGTH, ENC_NA);
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}
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mtree = proto_item_add_subtree(ti, ett_bittorrent_msg);
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/* Keepalive message */
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if (length == 0) {
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proto_tree_add_item(mtree, hf_bittorrent_msg_len, tvb, offset, BITTORRENT_HEADER_LENGTH, ENC_BIG_ENDIAN);
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col_set_str(pinfo->cinfo, COL_INFO, "KeepAlive");
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return;
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}
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proto_tree_add_item(mtree, hf_bittorrent_msg_len, tvb, offset, BITTORRENT_HEADER_LENGTH, ENC_BIG_ENDIAN);
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offset += BITTORRENT_HEADER_LENGTH;
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/* If the tvb_bytes_exist() call above returned FALSE, this will
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throw an exception, so we won't use msgtype or type. */
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if (isamp) {
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proto_tree_add_item(mtree, hf_azureus_msg_type_len, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(mtree, hf_azureus_msg_type, tvb, offset+4, typelen, ENC_ASCII|ENC_NA);
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proto_item_append_text(ti, ": Len %u, %s", length, msgtype);
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proto_tree_add_item(mtree, hf_azureus_msg_prio, tvb, offset+4+typelen, 1, ENC_BIG_ENDIAN);
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offset += 4+typelen+1;
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length -= 4+typelen+1;
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} else {
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proto_tree_add_item(mtree, hf_bittorrent_msg_type, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_item_append_text(ti, ": Len:%u, %s", length, msgtype);
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offset += 1;
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length -= 1;
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}
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col_set_str(pinfo->cinfo, COL_INFO, msgtype);
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switch (type) {
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case BITTORRENT_MESSAGE_CHOKE:
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case BITTORRENT_MESSAGE_UNCHOKE:
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case BITTORRENT_MESSAGE_INTERESTED:
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case BITTORRENT_MESSAGE_NOT_INTERESTED:
|
|
case BITT_FAST_EX_HAVE_ALL:
|
|
case BITT_FAST_EX_HAVE_NONE:
|
|
/* No payload */
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_REQUEST:
|
|
case BITTORRENT_MESSAGE_CANCEL:
|
|
case BITT_FAST_EX_REJECT_REQUEST:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_index, tvb, offset, 4, piece_index); offset += 4;
|
|
piece_begin = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_begin, tvb, offset, 4, piece_begin); offset += 4;
|
|
piece_length = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_length, tvb, offset, 4, piece_length);
|
|
proto_item_append_text(ti, ", Piece (Idx:0x%x,Begin:0x%x,Len:0x%x)", piece_index, piece_begin, piece_length);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Piece (Idx:0x%x,Begin:0x%x,Len:0x%x)", piece_index, piece_begin, piece_length);
|
|
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_PORT:
|
|
/* port as payload */
|
|
proto_tree_add_item(mtree, hf_bittorrent_port, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_EXTENDED:
|
|
/* extended message content */
|
|
proto_tree_add_item(mtree, hf_bittorrent_extended, tvb, offset, length, ENC_NA);
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_HAVE:
|
|
case BITT_FAST_EX_SUGGEST_PIECE:
|
|
case BITT_FAST_EX_ALLOWED_FAST:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(mtree, hf_bittorrent_piece_index, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_item_append_text(ti, ", Piece (Idx:0x%x)", piece_index);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Piece (Idx:0x%x)", piece_index);
|
|
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_BITFIELD:
|
|
proto_tree_add_item(mtree, hf_bittorrent_bitfield_data, tvb, offset, length, ENC_NA);
|
|
proto_item_append_text(ti, ", Len:0x%x", length);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Len:0x%x", length);
|
|
|
|
break;
|
|
|
|
case BITTORRENT_MESSAGE_PIECE:
|
|
piece_index = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_index, tvb, offset, 4, piece_index);
|
|
offset += 4;
|
|
length -= 4;
|
|
piece_begin = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint(mtree, hf_bittorrent_piece_begin, tvb, offset, 4, piece_begin);
|
|
offset += 4;
|
|
length -= 4;
|
|
proto_tree_add_item(mtree, hf_bittorrent_piece_data, tvb, offset, length, ENC_NA);
|
|
proto_item_append_text(ti, ", Idx:0x%x,Begin:0x%x,Len:0x%x", piece_index, piece_begin, length);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", Idx:0x%x,Begin:0x%x,Len:0x%x", piece_index, piece_begin, length);
|
|
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_HANDSHAKE:
|
|
case AZUREUS_MESSAGE_PEER_EXCHANGE:
|
|
subtvb = tvb_new_subset_length(tvb, offset, length);
|
|
call_dissector(bencode_handle, subtvb, pinfo, mtree);
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_JPC_HELLO:
|
|
stringlen = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_addrlen, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_addr, tvb, offset+4, stringlen, ENC_ASCII|ENC_NA);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_port, tvb, offset+4+stringlen, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_session, tvb, offset+4+stringlen+4, 4, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case AZUREUS_MESSAGE_JPC_REPLY:
|
|
proto_tree_add_item(mtree, hf_azureus_jpc_session, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
dissect_bittorrent_welcome (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
int offset = 0;
|
|
int i;
|
|
char *version;
|
|
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Handshake");
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_prot_name_len, tvb, offset, 1, ENC_BIG_ENDIAN); offset+=1;
|
|
proto_tree_add_item(tree, hf_bittorrent_prot_name, tvb, offset, 19, ENC_ASCII|ENC_NA); offset += 19;
|
|
proto_tree_add_item(tree, hf_bittorrent_reserved, tvb, offset, 8, ENC_NA); offset += 8;
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_sha1_hash, tvb, offset, 20, ENC_NA);
|
|
offset += 20;
|
|
|
|
proto_tree_add_item(tree, hf_bittorrent_peer_id, tvb, offset, 20, ENC_NA);
|
|
if(decode_client_information) {
|
|
for(i = 0; peer_id[i].name != NULL; ++i)
|
|
{
|
|
if(tvb_memeql(tvb, offset, peer_id[i].id, (int)strlen(peer_id[i].id)) == 0) {
|
|
version = tvb_get_string_enc(wmem_packet_scope(), tvb, offset + (int)strlen(peer_id[i].id),
|
|
peer_id[i].ver_len, ENC_ASCII);
|
|
proto_tree_add_string_format(tree, hf_bittorrent_version, tvb, offset, 20, version, "Client is %s v%s",
|
|
peer_id[i].name, format_text(wmem_packet_scope(), (guchar*)version, peer_id[i].ver_len));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
offset += 20;
|
|
return offset;
|
|
}
|
|
|
|
static
|
|
int dissect_bittorrent_tcp_pdu (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
proto_item *ti;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BitTorrent");
|
|
|
|
col_set_str(pinfo->cinfo, COL_INFO, "BitTorrent ");
|
|
|
|
ti = proto_tree_add_item (tree, proto_bittorrent, tvb, 0, -1, ENC_NA);
|
|
tree = proto_item_add_subtree(ti, ett_bittorrent);
|
|
|
|
if (tvb_get_guint8(tvb, 0) == 19 &&
|
|
tvb_memeql(tvb, 1, "BitTorrent protocol", 19) == 0) {
|
|
dissect_bittorrent_welcome(tvb, pinfo, tree);
|
|
} else {
|
|
dissect_bittorrent_message(tvb, pinfo, tree);
|
|
}
|
|
|
|
col_append_str(pinfo->cinfo, COL_INFO, " ");
|
|
col_set_fence(pinfo->cinfo, COL_INFO);
|
|
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
static
|
|
int dissect_bittorrent (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
|
|
{
|
|
tcp_dissect_pdus(tvb, pinfo, tree, bittorrent_desegment, BITTORRENT_HEADER_LENGTH,
|
|
get_bittorrent_pdu_length, dissect_bittorrent_tcp_pdu, data);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
static
|
|
gboolean test_bittorrent_packet (tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *tree, void *data)
|
|
{
|
|
conversation_t *conversation;
|
|
|
|
if (tvb_captured_length(tvb) >= 20 &&
|
|
tvb_get_guint8(tvb, 0) == 19 &&
|
|
tvb_memeql(tvb, 1, "BitTorrent protocol", 19) == 0) {
|
|
conversation = find_or_create_conversation(pinfo);
|
|
conversation_set_dissector(conversation, dissector_handle);
|
|
|
|
dissect_bittorrent(tvb, pinfo, tree, data);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
proto_register_bittorrent(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
#if 0
|
|
{ &hf_bittorrent_field_length,
|
|
{ "Field Length", "bittorrent.length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
#endif
|
|
{ &hf_bittorrent_prot_name_len,
|
|
{ "Protocol Name Length", "bittorrent.protocol.name.length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_prot_name,
|
|
{ "Protocol Name", "bittorrent.protocol.name", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_reserved,
|
|
{ "Reserved Extension Bytes", "bittorrent.reserved", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_sha1_hash,
|
|
{ "SHA1 Hash of info dictionary", "bittorrent.info_hash", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_peer_id,
|
|
{ "Peer ID", "bittorrent.peer_id", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg,
|
|
{ "Message", "bittorrent.msg", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg_len,
|
|
{ "Message Length", "bittorrent.msg.length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_msg_type,
|
|
{ "Message Type", "bittorrent.msg.type", FT_UINT8, BASE_DEC, VALS(bittorrent_messages), 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_msg,
|
|
{ "Azureus Message", "bittorrent.azureus_msg", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_msg_type_len,
|
|
{ "Message Type Length", "bittorrent.msg.typelen", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_msg_type,
|
|
{ "Message Type", "bittorrent.msg.aztype", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_msg_prio,
|
|
{ "Message Priority", "bittorrent.msg.prio", FT_UINT8, BASE_DEC, VALS(azureus_priorities), 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_bitfield_data,
|
|
{ "Bitfield data", "bittorrent.msg.bitfield", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_index,
|
|
{ "Piece index", "bittorrent.piece.index", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_begin,
|
|
{ "Begin offset of piece", "bittorrent.piece.begin", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_data,
|
|
{ "Data in a piece", "bittorrent.piece.data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_piece_length,
|
|
{ "Piece Length", "bittorrent.piece.length", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_addrlen,
|
|
{ "Cache Address Length", "bittorrent.jpc.addr.length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_addr,
|
|
{ "Cache Address", "bittorrent.jpc.addr", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_port,
|
|
{ "Port", "bittorrent.jpc.port", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_azureus_jpc_session,
|
|
{ "Session ID", "bittorrent.jpc.session", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_port,
|
|
{ "Port", "bittorrent.port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_extended,
|
|
{ "Extended Message", "bittorrent.extended", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_continuous_data,
|
|
{ "Extended Message", "bittorrent.continuous_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_bittorrent_version,
|
|
{ "Client version", "bittorrent.version", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_bittorrent,
|
|
&ett_bittorrent_msg,
|
|
&ett_peer_id,
|
|
};
|
|
|
|
module_t *bittorrent_module;
|
|
|
|
proto_bittorrent = proto_register_protocol("BitTorrent", "BitTorrent", "bittorrent");
|
|
proto_register_field_array(proto_bittorrent, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
dissector_handle = register_dissector("bittorrent.tcp", dissect_bittorrent, proto_bittorrent);
|
|
|
|
bittorrent_module = prefs_register_protocol(proto_bittorrent, NULL);
|
|
prefs_register_bool_preference(bittorrent_module, "desegment",
|
|
"Reassemble BitTorrent messages spanning multiple TCP segments",
|
|
"Whether the BitTorrent dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&bittorrent_desegment);
|
|
prefs_register_bool_preference(bittorrent_module, "decode_client",
|
|
"Decode the peer_id of the handshake messages",
|
|
"Enabling this will tell which BitTorrent client that produced the handshake message",
|
|
&decode_client_information);
|
|
}
|
|
|
|
|
|
void
|
|
proto_reg_handoff_bittorrent(void)
|
|
{
|
|
bencode_handle = find_dissector_add_dependency("bencode", proto_bittorrent);
|
|
|
|
dissector_add_uint_range_with_preference("tcp.port", DEFAULT_TCP_PORT_RANGE, dissector_handle);
|
|
|
|
heur_dissector_add("tcp", test_bittorrent_packet, "BitTorrent over TCP", "bittorrent_tcp", proto_bittorrent, HEURISTIC_ENABLE);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 3
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=3 tabstop=8 expandtab:
|
|
* :indentSize=3:tabSize=8:noTabs=true:
|
|
*/
|