/* packet-bitcoin.c * Routines for bitcoin dissection * Copyright 2011, Christian Svensson * Bitcoin address: 15Y2EN5mLnsTt3CZBfgpnZR5SeLwu7WEHz * * See https://en.bitcoin.it/wiki/Protocol_specification * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include #include #include #include #include #include "packet-tcp.h" #define BITCOIN_MAIN_MAGIC_NUMBER 0xD9B4BEF9 #define BITCOIN_TESTNET_MAGIC_NUMBER 0xDAB5BFFA #define BITCOIN_TESTNET3_MAGIC_NUMBER 0x0709110B /* * Minimum bitcoin identification header. * - Magic - 4 bytes * - Command - 12 bytes * - Payload length - 4 bytes */ #define BITCOIN_HEADER_LENGTH 4+12+4 static int proto_bitcoin = -1; static gint hf_bitcoin_magic = -1; static gint hf_bitcoin_command = -1; static gint hf_bitcoin_length = -1; static gint hf_bitcoin_checksum = -1; /* version message */ static gint hf_bitcoin_msg_version = -1; static gint hf_msg_version_version = -1; static gint hf_msg_version_services = -1; static gint hf_msg_version_timestamp = -1; static gint hf_msg_version_addr_me = -1; static gint hf_msg_version_addr_you = -1; static gint hf_msg_version_nonce = -1; static gint hf_msg_version_subver = -1; static gint hf_msg_version_start_height = -1; /* addr message */ static gint hf_msg_addr_count8 = -1; static gint hf_msg_addr_count16 = -1; static gint hf_msg_addr_count32 = -1; static gint hf_msg_addr_count64 = -1; static gint hf_bitcoin_msg_addr = -1; static gint hf_msg_addr_address = -1; static gint hf_msg_addr_timestamp = -1; /* inv message */ static gint hf_msg_inv_count8 = -1; static gint hf_msg_inv_count16 = -1; static gint hf_msg_inv_count32 = -1; static gint hf_msg_inv_count64 = -1; static gint hf_bitcoin_msg_inv = -1; static gint hf_msg_inv_type = -1; static gint hf_msg_inv_hash = -1; /* getdata message */ static gint hf_msg_getdata_count8 = -1; static gint hf_msg_getdata_count16 = -1; static gint hf_msg_getdata_count32 = -1; static gint hf_msg_getdata_count64 = -1; static gint hf_bitcoin_msg_getdata = -1; static gint hf_msg_getdata_type = -1; static gint hf_msg_getdata_hash = -1; /* getblocks message */ static gint hf_msg_getblocks_count8 = -1; static gint hf_msg_getblocks_count16 = -1; static gint hf_msg_getblocks_count32 = -1; static gint hf_msg_getblocks_count64 = -1; static gint hf_bitcoin_msg_getblocks = -1; static gint hf_msg_getblocks_start = -1; static gint hf_msg_getblocks_stop = -1; /* getheaders message */ static gint hf_msg_getheaders_count8 = -1; static gint hf_msg_getheaders_count16 = -1; static gint hf_msg_getheaders_count32 = -1; static gint hf_msg_getheaders_count64 = -1; static gint hf_bitcoin_msg_getheaders = -1; static gint hf_msg_getheaders_start = -1; static gint hf_msg_getheaders_stop = -1; /* tx message */ static gint hf_msg_tx_in_count8 = -1; static gint hf_msg_tx_in_count16 = -1; static gint hf_msg_tx_in_count32 = -1; static gint hf_msg_tx_in_count64 = -1; static gint hf_bitcoin_msg_tx = -1; static gint hf_msg_tx_version = -1; static gint hf_msg_tx_in_script8 = -1; static gint hf_msg_tx_in_script16 = -1; static gint hf_msg_tx_in_script32 = -1; static gint hf_msg_tx_in_script64 = -1; static gint hf_msg_tx_in = -1; static gint hf_msg_tx_in_prev_output = -1; static gint hf_msg_tx_in_sig_script = -1; static gint hf_msg_tx_in_seq = -1; static gint hf_msg_tx_out_count8 = -1; static gint hf_msg_tx_out_count16 = -1; static gint hf_msg_tx_out_count32 = -1; static gint hf_msg_tx_out_count64 = -1; static gint hf_msg_tx_outp_hash = -1; static gint hf_msg_tx_outp_index = -1; static gint hf_msg_tx_out = -1; static gint hf_msg_tx_out_value = -1; static gint hf_msg_tx_out_script = -1; static gint hf_msg_tx_lock_time = -1; /* block message */ static gint hf_msg_block_transactions8 = -1; static gint hf_msg_block_transactions16 = -1; static gint hf_msg_block_transactions32 = -1; static gint hf_msg_block_transactions64 = -1; static gint hf_bitcoin_msg_block = -1; static gint hf_msg_block_version = -1; static gint hf_msg_block_prev_block = -1; static gint hf_msg_block_merkle_root = -1; static gint hf_msg_block_time = -1; static gint hf_msg_block_bits = -1; static gint hf_msg_block_nonce = -1; /* services */ static gint hf_services_network = -1; /* address */ static gint hf_address_services = -1; static gint hf_address_address = -1; static gint hf_address_port = -1; static gint ett_bitcoin = -1; static gint ett_bitcoin_msg = -1; static gint ett_services = -1; static gint ett_address = -1; static gint ett_addr_list = -1; static gint ett_inv_list = -1; static gint ett_getdata_list = -1; static gint ett_getblocks_list = -1; static gint ett_getheaders_list = -1; static gint ett_tx_in_list = -1; static gint ett_tx_in_outp = -1; static gint ett_tx_out_list = -1; static gboolean bitcoin_desegment = TRUE; static const value_string inv_types[] = { { 0, "ERROR" }, { 1, "MSG_TX" }, { 2, "MSG_BLOCK" }, { 0, NULL } }; static guint get_bitcoin_pdu_length(packet_info *pinfo _U_, tvbuff_t *tvb, int offset) { guint32 length; length = BITCOIN_HEADER_LENGTH; if(tvb_memeql(tvb, offset+4, "version", 7) != 0 && tvb_memeql(tvb, offset+4, "verack", 6) != 0) { /* add checksum field */ length += 4; } /* add payload length */ length += tvb_get_letohl(tvb, offset+16); return length; } /** * Create a services sub-tree for bit-by-bit display */ static proto_tree *create_services_tree(tvbuff_t *tvb, proto_item *ti, guint32 offset) { proto_tree *tree; guint64 services; tree = proto_item_add_subtree(ti, ett_services); /* start of services */ /* NOTE: * - 2011-06-05 * Currently the boolean tree only supports a maximum of * 32 bits - so we split services in two */ services = tvb_get_letoh64(tvb, offset); /* service = NODE_NETWORK */ proto_tree_add_boolean(tree, hf_services_network, tvb, offset, 4, (guint32)services); /* end of services */ return tree; } /** * Create a sub-tree and fill it with a net_addr structure */ static proto_tree *create_address_tree(tvbuff_t *tvb, proto_item *ti, guint32 offset) { proto_tree *tree; tree = proto_item_add_subtree(ti, ett_address); /* services */ ti = proto_tree_add_item(tree, hf_address_services, tvb, offset, 8, ENC_LITTLE_ENDIAN); create_services_tree(tvb, ti, offset); offset += 8; /* IPv6 address */ proto_tree_add_item(tree, hf_address_address, tvb, offset, 16, ENC_NA); offset += 16; /* port */ proto_tree_add_item(tree, hf_address_port, tvb, offset, 2, ENC_LITTLE_ENDIAN); return tree; } /** * Extract a variable length integer from a tvbuff */ static gint get_varint(tvbuff_t *tvb, const gint offset, gint *length, guint64 *ret) { guint64 value; gint remain; remain = tvb_reported_length_remaining(tvb, offset); if(remain < 1) return -1; /* calculate variable length */ value = tvb_get_guint8(tvb, offset); if(value < 0xfd) { *length = 1; *ret = value; return 0; } if(value == 0xfd && remain >= 3) { *length = 3; *ret = tvb_get_letohs(tvb, offset+1); return 0; } if(value == 0xfe && remain >= 5) { *length = 5; *ret = tvb_get_letohl(tvb, offset+1); return 0; } if(remain >= 9) { *length = 9; *ret = tvb_get_letoh64(tvb, offset+1); return 0; } /* could not get varint */ return -1; } static void add_varint_item(proto_tree *tree, tvbuff_t *tvb, const gint offset, gint length, gint hf8, gint hf16, gint hf32, gint hf64) { switch(length) { case 1: proto_tree_add_item(tree, hf8, tvb, offset, 1, ENC_LITTLE_ENDIAN); break; case 3: proto_tree_add_item(tree, hf16, tvb, offset+1, 2, ENC_LITTLE_ENDIAN); break; case 5: proto_tree_add_item(tree, hf32, tvb, offset+1, 4, ENC_LITTLE_ENDIAN); break; case 9: proto_tree_add_item(tree, hf64, tvb, offset+1, 8, ENC_LITTLE_ENDIAN); break; } } /** * Handler for version messages */ static guint32 dissect_bitcoin_msg_version(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint subver_length; guint32 version; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_version, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); version = tvb_get_letohl(tvb, offset); proto_tree_add_item(tree, hf_msg_version_version, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; ti = proto_tree_add_item(tree, hf_msg_version_services, tvb, offset, 8, ENC_LITTLE_ENDIAN); create_services_tree(tvb, ti, offset); offset += 8; proto_tree_add_item(tree, hf_msg_version_timestamp, tvb, offset, 8, TRUE); offset += 8; ti = proto_tree_add_item(tree, hf_msg_version_addr_me, tvb, offset, 26, ENC_NA); create_address_tree(tvb, ti, offset); offset += 26; if(version >= 106) { ti = proto_tree_add_item(tree, hf_msg_version_addr_you, tvb, offset, 26, ENC_NA); create_address_tree(tvb, ti, offset); offset += 26; proto_tree_add_item(tree, hf_msg_version_nonce, tvb, offset, 8, ENC_LITTLE_ENDIAN); offset += 8; /* find null terminated subver */ subver_length = 0; subver_length = tvb_strsize(tvb, offset); proto_tree_add_item(tree, hf_msg_version_subver, tvb, offset, subver_length, ENC_ASCII|ENC_NA); offset += subver_length; if(version >= 209) { proto_tree_add_item(tree, hf_msg_version_start_height, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; } } return offset; } /** * Handler for address messages */ static guint32 dissect_bitcoin_msg_addr(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_addr, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_addr_count8, hf_msg_addr_count16, hf_msg_addr_count32, hf_msg_addr_count64); offset += length; for(; count > 0; count--) { proto_tree *subtree; ti = proto_tree_add_item(tree, hf_msg_addr_address, tvb, offset, 30, ENC_NA); subtree = create_address_tree(tvb, ti, offset+4); proto_tree_add_item(subtree, hf_msg_addr_timestamp, tvb, offset, 4, TRUE); offset += 26; offset += 4; } return offset; } /** * Handler for inventory messages */ static guint32 dissect_bitcoin_msg_inv(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_inv, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_inv_count8, hf_msg_inv_count16, hf_msg_inv_count32, hf_msg_inv_count64); for(; count > 0; count--) { proto_tree *subtree; ti = proto_tree_add_text(tree, tvb, offset, 36, "Inventory vector"); subtree = proto_item_add_subtree(ti, ett_inv_list); proto_tree_add_item(subtree, hf_msg_inv_type, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; proto_tree_add_item(subtree, hf_msg_inv_hash, tvb, offset, 32, ENC_NA); offset += 32; } return offset; } /** * Handler for getdata messages */ static guint32 dissect_bitcoin_msg_getdata(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_getdata, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_getdata_count8, hf_msg_getdata_count16, hf_msg_getdata_count32, hf_msg_getdata_count64); for(; count > 0; count--) { proto_tree *subtree; ti = proto_tree_add_text(tree, tvb, offset, 36, "Inventory vector"); subtree = proto_item_add_subtree(ti, ett_getdata_list); proto_tree_add_item(subtree, hf_msg_getdata_type, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; proto_tree_add_item(subtree, hf_msg_getdata_hash, tvb, offset, 32, ENC_NA); offset += 32; } return offset; } /** * Handler for getblocks messages */ static guint32 dissect_bitcoin_msg_getblocks(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_getblocks, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); /* why the protcol version is sent here nobody knows */ proto_tree_add_item(tree, hf_msg_version_version, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_getblocks_count8, hf_msg_getblocks_count16, hf_msg_getblocks_count32, hf_msg_getblocks_count64); for(; count > 0; count--) { proto_tree_add_item(tree, hf_msg_getblocks_start, tvb, offset, 32, ENC_NA); offset += 32; } proto_tree_add_item(tree, hf_msg_getblocks_stop, tvb, offset, 32, ENC_NA); return offset + 32; } /** * Handler for getheaders messages * UNTESTED */ static guint32 dissect_bitcoin_msg_getheaders(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_getheaders, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_getheaders_count8, hf_msg_getheaders_count16, hf_msg_getheaders_count32, hf_msg_getheaders_count64); for(; count > 0; count--) { proto_tree_add_item(tree, hf_msg_getheaders_start, tvb, offset, 32, ENC_NA); offset += 32; } proto_tree_add_item(tree, hf_msg_getheaders_stop, tvb, offset, 32, ENC_NA); return offset + 32; } /** * Handler for tx messages */ static guint32 dissect_bitcoin_msg_tx(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *rti; gint count_length; guint64 in_count; guint64 out_count; guint32 offset = 0; rti = proto_tree_add_item(tree, hf_bitcoin_msg_tx, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(rti, ett_bitcoin_msg); proto_tree_add_item(tree, hf_msg_tx_version, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; if (get_varint(tvb, offset, &count_length, &in_count)) return offset; add_varint_item(tree, tvb, offset, count_length, hf_msg_tx_in_count8, hf_msg_tx_in_count16, hf_msg_tx_in_count32, hf_msg_tx_in_count64); for(; in_count > 0; in_count--) { proto_tree *subtree; proto_tree *prevtree; proto_item *ti; proto_item *pti; guint64 script_length; if (get_varint(tvb, offset, &count_length, &script_length)) return offset; ti = proto_tree_add_item(tree, hf_msg_tx_in, tvb, offset, 40+count_length+(guint)script_length, ENC_NA); subtree = proto_item_add_subtree(ti, ett_tx_in_list); add_varint_item(subtree, tvb, offset, count_length, hf_msg_tx_in_script8, hf_msg_tx_in_script16, hf_msg_tx_in_script32, hf_msg_tx_in_script64); /* previous output */ pti = proto_tree_add_item(subtree, hf_msg_tx_in_prev_output, tvb, offset, 36, ENC_NA); prevtree = proto_item_add_subtree(pti, ett_tx_in_outp); proto_tree_add_item(prevtree, hf_msg_tx_outp_hash, tvb, offset, 32, ENC_NA); offset += 32; proto_tree_add_item(prevtree, hf_msg_tx_outp_index, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; /* end previous output */ offset += count_length; proto_tree_add_item(subtree, hf_msg_tx_in_sig_script, tvb, offset, (guint)script_length, ENC_NA); offset += (guint)script_length; proto_tree_add_item(subtree, hf_msg_tx_in_seq, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; } if (get_varint(tvb, offset, &count_length, &out_count)) return offset; add_varint_item(tree, tvb, offset, count_length, hf_msg_tx_out_count8, hf_msg_tx_out_count16, hf_msg_tx_out_count32, hf_msg_tx_out_count64); for(; out_count > 0; out_count--) { proto_item *ti; proto_tree *subtree; /* XXX - currently isn't read, may need to be a 64-bit value */ guint script_length = 0; ti = proto_tree_add_item(tree, hf_msg_tx_out, tvb, offset, 8+script_length+count_length, ENC_NA); subtree = proto_item_add_subtree(ti, ett_tx_out_list); proto_tree_add_item(subtree, hf_msg_tx_out_value, tvb, offset, 8, ENC_LITTLE_ENDIAN); offset += 8; offset += count_length; proto_tree_add_item(subtree, hf_msg_tx_out_script, tvb, offset, script_length, ENC_NA); offset += script_length; } proto_tree_add_item(tree, hf_msg_tx_lock_time, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; /* needed for block nesting */ proto_item_set_len(rti, offset); return offset; } /** * Handler for block messages */ static guint32 dissect_bitcoin_msg_block(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree) { proto_item *ti; gint length; guint64 count; guint32 offset = 0; ti = proto_tree_add_item(tree, hf_bitcoin_msg_block, tvb, offset, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin_msg); proto_tree_add_item(tree, hf_msg_block_version, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; proto_tree_add_item(tree, hf_msg_block_prev_block, tvb, offset, 32, ENC_NA); offset += 32; proto_tree_add_item(tree, hf_msg_block_merkle_root, tvb, offset, 32, ENC_NA); offset += 32; proto_tree_add_item(tree, hf_msg_block_time, tvb, offset, 4, TRUE); offset += 4; proto_tree_add_item(tree, hf_msg_block_bits, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; proto_tree_add_item(tree, hf_msg_block_nonce, tvb, offset, 4, ENC_LITTLE_ENDIAN); offset += 4; if (get_varint(tvb, offset, &length, &count)) return offset; add_varint_item(tree, tvb, offset, length, hf_msg_block_transactions8, hf_msg_block_transactions16, hf_msg_block_transactions32, hf_msg_block_transactions64); for(; count > 0; count--) { tvbuff_t *tvb_sub; guint32 tx_offset; tvb_sub = tvb_new_subset_remaining(tvb, offset); tx_offset = dissect_bitcoin_msg_tx(tvb_sub, pinfo, tree); /* check for errors */ if(tx_offset == (guint32)-1) return -1; offset += tx_offset; } return offset; } /** * Handler for unimplemented or payload-less messages */ static guint32 dissect_bitcoin_msg_empty(tvbuff_t *tvb _U_, packet_info *pinfo _U_, proto_tree *tree _U_) { return 0; } typedef guint32 (*msg_dissector_func_t)(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree); typedef struct msg_dissector { const gchar *command; msg_dissector_func_t function; } msg_dissector_t; static msg_dissector_t msg_dissectors[] = { {"version", dissect_bitcoin_msg_version}, {"addr", dissect_bitcoin_msg_addr}, {"inv", dissect_bitcoin_msg_inv}, {"getdata", dissect_bitcoin_msg_getdata}, {"getblocks", dissect_bitcoin_msg_getblocks}, {"getheaders", dissect_bitcoin_msg_getheaders}, {"tx", dissect_bitcoin_msg_tx}, {"block", dissect_bitcoin_msg_block}, /* messages with no payload */ {"verack", dissect_bitcoin_msg_empty}, {"getaddr", dissect_bitcoin_msg_empty}, {"block", dissect_bitcoin_msg_empty}, {"ping", dissect_bitcoin_msg_empty}, /* messages not implemented */ {"headers", dissect_bitcoin_msg_empty}, {"checkorder", dissect_bitcoin_msg_empty}, {"submitorder", dissect_bitcoin_msg_empty}, {"reply", dissect_bitcoin_msg_empty}, {"alert", dissect_bitcoin_msg_empty} }; static void dissect_bitcoin_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *ti; guint32 i; guint32 offset = 0; col_set_str(pinfo->cinfo, COL_PROTOCOL, "Bitcoin"); ti = proto_tree_add_item(tree, proto_bitcoin, tvb, 0, -1, ENC_NA); tree = proto_item_add_subtree(ti, ett_bitcoin); /* add basic protocol data */ proto_tree_add_item(tree, hf_bitcoin_magic, tvb, 0, 4, ENC_BIG_ENDIAN); proto_tree_add_item(tree, hf_bitcoin_command, tvb, 4, 12, ENC_ASCII|ENC_NA); proto_tree_add_item(tree, hf_bitcoin_length, tvb, 16, 4, ENC_LITTLE_ENDIAN); offset = 20; if(tvb_memeql(tvb, 4, "version", 7) != 0 && tvb_memeql(tvb, 4, "verack", 6) != 0) { proto_tree_add_item(tree, hf_bitcoin_checksum, tvb, 20, 4, ENC_BIG_ENDIAN); offset += 4; /* TODO: verify checksum? */ } /* handle command specific message part */ for(i = 0; i < array_length(msg_dissectors); i++) { if(tvb_memeql(tvb, 4, msg_dissectors[i].command, strlen(msg_dissectors[i].command)) == 0) { tvbuff_t *tvb_sub; col_append_sep_str(pinfo->cinfo, COL_INFO, ", ", msg_dissectors[i].command); tvb_sub = tvb_new_subset_remaining(tvb, offset); msg_dissectors[i].function(tvb_sub, pinfo, tree); return; } } /* no handler found */ col_append_sep_str(pinfo->cinfo, COL_INFO, ", ", "[unknown command]"); expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR, "Unknown command"); } static int dissect_bitcoin(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { col_clear(pinfo->cinfo, COL_INFO); tcp_dissect_pdus(tvb, pinfo, tree, bitcoin_desegment, BITCOIN_HEADER_LENGTH, get_bitcoin_pdu_length, dissect_bitcoin_tcp_pdu); return tvb_reported_length(tvb); } static gboolean dissect_bitcoin_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) { guint32 magic_number; if (tvb_reported_length(tvb) < 4) return FALSE; magic_number = tvb_get_letohl(tvb, 0); if ((magic_number != BITCOIN_MAIN_MAGIC_NUMBER) && (magic_number != BITCOIN_TESTNET_MAGIC_NUMBER) && (magic_number != BITCOIN_TESTNET3_MAGIC_NUMBER)) return FALSE; dissect_bitcoin(tvb, pinfo, tree, data); return TRUE; } void proto_register_bitcoin(void) { static hf_register_info hf[] = { { &hf_bitcoin_magic, { "Packet magic", "bitcoin.magic", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_command, { "Command name", "bitcoin.command", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_length, { "Payload Length", "bitcoin.length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_checksum, { "Payload checksum", "bitcoin.checksum", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, /* version message */ { &hf_bitcoin_msg_version, { "Version message", "bitcoin.version", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_version, { "Protocol version", "bitcoin.version.version", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_services, { "Node services", "bitcoin.version.services", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_addr_me, { "Address of emmitting node", "bitcoin.version.addr_me", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_addr_you, { "Address as seen by the emitting node", "bitcoin.version.addr_you", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_timestamp, { "Node timestamp", "bitcoin.version.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_nonce, { "Random nonce", "bitcoin.version.nonce", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_subver, { "Sub-version string", "bitcoin.version.subver", FT_STRINGZ, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_version_start_height, { "Block start height", "bitcoin.version.start_height", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, /* addr message */ { &hf_msg_addr_count8, { "Count", "bitcoin.addr.count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_addr_count16, { "Count", "bitcoin.addr.count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_addr_count32, { "Count", "bitcoin.addr.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_addr_count64, { "Count", "bitcoin.addr.count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_addr, { "Address message", "bitcoin.addr", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_addr_address, { "Address", "bitcoin.addr.address", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_addr_timestamp, { "Address timestamp", "bitcoin.addr.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL } }, /* inv message */ { &hf_msg_inv_count8, { "Count", "bitcoin.inv.count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_inv_count16, { "Count", "bitcoin.inv.count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_inv_count32, { "Count", "bitcoin.inv.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_inv_count64, { "Count", "bitcoin.inv.count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_inv, { "Inventory message", "bitcoin.inv", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_inv_type, { "Type", "bitcoin.inv.type", FT_UINT32, BASE_DEC, VALS(inv_types), 0x0, NULL, HFILL } }, { &hf_msg_inv_hash, { "Data hash", "bitcoin.inv.hash", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, /* getdata message */ { &hf_msg_getdata_count8, { "Count", "bitcoin.getdata.count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getdata_count16, { "Count", "bitcoin.getdata.count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getdata_count32, { "Count", "bitcoin.getdata.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getdata_count64, { "Count", "bitcoin.getdata.count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_getdata, { "Getdata message", "bitcoin.getdata", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getdata_type, { "Type", "bitcoin.getdata.type", FT_UINT32, BASE_DEC, VALS(inv_types), 0x0, NULL, HFILL } }, { &hf_msg_getdata_hash, { "Data hash", "bitcoin.getdata.hash", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, /* getblocks message */ { &hf_msg_getblocks_count8, { "Count", "bitcoin.getblocks.count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getblocks_count16, { "Count", "bitcoin.getblocks.count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getblocks_count32, { "Count", "bitcoin.getblocks.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getblocks_count64, { "Count", "bitcoin.getblocks.count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_getblocks, { "Getdata message", "bitcoin.getblocks", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getblocks_start, { "Starting hash", "bitcoin.getblocks.hash_start", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getblocks_stop, { "Stopping hash", "bitcoin.getblocks.hash_stop", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, /* getheaders message */ { &hf_msg_getheaders_count8, { "Count", "bitcoin.getheaders.count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getheaders_count16, { "Count", "bitcoin.getheaders.count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getheaders_count32, { "Count", "bitcoin.getheaders.count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getheaders_count64, { "Count", "bitcoin.getheaders.count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_getheaders, { "Getheaders message", "bitcoin.getheaders", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getheaders_start, { "Starting hash", "bitcoin.getheaders.hash_start", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_getheaders_stop, { "Stopping hash", "bitcoin.getheaders.hash_stop", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, /* tx message */ { &hf_msg_tx_in_count8, { "Input Count", "bitcoin.tx.input_count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_count16, { "Input Count", "bitcoin.tx.input_count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_count32, { "Input Count", "bitcoin.tx.input_count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_count64, { "Input Count", "bitcoin.tx.input_count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_tx, { "Tx message", "bitcoin.tx", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_version, { "Transaction version", "bitcoin.tx.version", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, /* tx message - input */ { &hf_msg_tx_in_script8, { "Script Length", "bitcoin.tx.in.script_length", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_script16, { "Script Length", "bitcoin.tx.in.script_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_script32, { "Script Length", "bitcoin.tx.in.script_length", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_script64, { "Script Length", "bitcoin.tx.in.script_length", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in, { "Transaction input", "bitcoin.tx.in", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_prev_output, { "Previous output", "bitcoin.tx.in.prev_output", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_count8, { "Output Count", "bitcoin.tx.output_count", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_count16, { "Output Count", "bitcoin.tx.output_count", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_count32, { "Output Count", "bitcoin.tx.output_count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_count64, { "Output Count", "bitcoin.tx.output_count", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_outp_hash, { "Hash", "bitcoin.tx.in.prev_output.hash", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_outp_index, { "Index", "bitcoin.tx.in.prev_output.index", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_sig_script, { "Signature script", "bitcoin.tx.in.sig_script", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_in_seq, { "Sequence", "bitcoin.tx.in.seq", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, /* tx message - output */ { &hf_msg_tx_out, { "Transaction output", "bitcoin.tx.out", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_value, { "Value", "bitcoin.tx.out.value", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_out_script, { "Script", "bitcoin.tx.out.script", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_tx_lock_time, { "Block lock time or block ID", "bitcoin.tx.lock_time", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, /* block message */ { &hf_msg_block_transactions8, { "Number of transactions", "bitcoin.block.num_transactions", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_transactions16, { "Number of transactions", "bitcoin.tx.num_transactions", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_transactions32, { "Number of transactions", "bitcoin.tx.num_transactions", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_transactions64, { "Number of transactions", "bitcoin.tx.num_transactions", FT_UINT64, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_bitcoin_msg_block, { "Block message", "bitcoin.block", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_version, { "Block version", "bitcoin.block.version", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_prev_block, { "Previous block", "bitcoin.block.prev_block", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_merkle_root, { "Merkle root", "bitcoin.block.merkle_root", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_time, { "Block timestamp", "bitcoin.block.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_bits, { "Bits", "bitcoin.block.merkle_root", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_msg_block_nonce, { "Nonce", "bitcoin.block.nonce", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } }, /* services */ { &hf_services_network, { "Network node", "bitcoin.services.network", FT_BOOLEAN, 32, TFS(&tfs_set_notset), 0x1, NULL, HFILL } }, /* address */ { &hf_address_services, { "Node services", "bitcoin.address.services", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL } }, { &hf_address_address, { "Node address", "bitcoin.address.address", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL } }, { &hf_address_port, { "Node port", "bitcoin.address.port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } } }; static gint *ett[] = { &ett_bitcoin, &ett_bitcoin_msg, &ett_services, &ett_address, &ett_addr_list, &ett_inv_list, &ett_getdata_list, &ett_getblocks_list, &ett_getheaders_list, &ett_tx_in_list, &ett_tx_in_outp, &ett_tx_out_list, }; module_t *bitcoin_module; proto_bitcoin = proto_register_protocol( "Bitcoin protocol", "Bitcoin", "bitcoin"); proto_register_subtree_array(ett, array_length(ett)); proto_register_field_array(proto_bitcoin, hf, array_length(hf)); new_register_dissector("bitcoin", dissect_bitcoin, proto_bitcoin); bitcoin_module = prefs_register_protocol(proto_bitcoin, NULL); prefs_register_bool_preference(bitcoin_module, "desegment", "Desegment all Bitcoin messages spanning multiple TCP segments", "Whether the Bitcoin dissector should desegment all messages spanning multiple TCP segments", &bitcoin_desegment); } void proto_reg_handoff_bitcoin(void) { static dissector_handle_t bitcoin_handle; bitcoin_handle = find_dissector("bitcoin"); dissector_add_handle("tcp.port", bitcoin_handle); heur_dissector_add( "tcp", dissect_bitcoin_heur, proto_bitcoin); }