Branch data Line data Source code
1 : : // Copyright (c) 2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 The Bitcoin Core developers
3 : : // Distributed under the MIT software license, see the accompanying
4 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 : :
6 : : #include <chain.h>
7 : : #include <chainparams.h>
8 : : #include <coins.h>
9 : : #include <index/txindex.h>
10 : : #include <merkleblock.h>
11 : : #include <node/blockstorage.h>
12 : : #include <primitives/transaction.h>
13 : : #include <rpc/server.h>
14 : : #include <rpc/server_util.h>
15 : : #include <rpc/util.h>
16 : : #include <univalue.h>
17 [ + - ]: 2 : #include <util/strencodings.h>
18 [ + - ]: 2 : #include <validation.h>
19 : :
20 : : using node::GetTransaction;
21 : :
22 : 2 : static RPCHelpMan gettxoutproof()
23 : : {
24 [ + - - + : 4 : return RPCHelpMan{"gettxoutproof",
# # # # ]
25 [ + - ]: 2 : "\nReturns a hex-encoded proof that \"txid\" was included in a block.\n"
26 : : "\nNOTE: By default this function only works sometimes. This is when there is an\n"
27 : 2 : "unspent output in the utxo for this transaction. To make it always work,\n"
28 : : "you need to maintain a transaction index, using the -txindex command line option or\n"
29 : : "specify the block in which the transaction is included manually (by blockhash).\n",
30 [ + - ]: 6 : {
31 [ + - + - : 4 : {"txids", RPCArg::Type::ARR, RPCArg::Optional::NO, "The txids to filter",
+ - ]
32 [ + - ]: 4 : {
33 [ + - + - : 2 : {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "A transaction hash"},
+ - ]
34 : : },
35 : : },
36 [ + - + - : 2 : {"blockhash", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "If specified, looks for txid in the block with this hash"},
+ - ]
37 : : },
38 [ + - + - ]: 2 : RPCResult{
39 [ + - + - ]: 2 : RPCResult::Type::STR, "data", "A string that is a serialized, hex-encoded data for the proof."
40 : : },
41 [ + - + - ]: 2 : RPCExamples{""},
42 [ + - ]: 2 : [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
43 : : {
44 : 0 : std::set<uint256> setTxids;
45 [ # # # # : 0 : UniValue txids = request.params[0].get_array();
# # ]
46 [ # # # # ]: 0 : if (txids.empty()) {
47 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_PARAMETER, "Parameter 'txids' cannot be empty");
# # ]
48 : : }
49 [ # # # # ]: 0 : for (unsigned int idx = 0; idx < txids.size(); idx++) {
50 [ # # # # : 0 : auto ret = setTxids.insert(ParseHashV(txids[idx], "txid"));
# # # # ]
51 [ # # ]: 0 : if (!ret.second) {
52 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_PARAMETER, std::string("Invalid parameter, duplicated txid: ") + txids[idx].get_str());
# # # # #
# # # ]
53 : : }
54 : 0 : }
55 : :
56 : 0 : const CBlockIndex* pblockindex = nullptr;
57 [ # # ]: 0 : uint256 hashBlock;
58 [ # # ]: 0 : ChainstateManager& chainman = EnsureAnyChainman(request.context);
59 [ # # # # : 0 : if (!request.params[1].isNull()) {
# # ]
60 [ # # # # ]: 0 : LOCK(cs_main);
61 [ # # # # : 0 : hashBlock = ParseHashV(request.params[1], "blockhash");
# # ]
62 [ # # ]: 0 : pblockindex = chainman.m_blockman.LookupBlockIndex(hashBlock);
63 [ # # ]: 0 : if (!pblockindex) {
64 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
# # ]
65 : : }
66 : 0 : } else {
67 [ # # # # ]: 0 : LOCK(cs_main);
68 [ # # ]: 0 : Chainstate& active_chainstate = chainman.ActiveChainstate();
69 : :
70 : : // Loop through txids and try to find which block they're in. Exit loop once a block is found.
71 [ # # ]: 0 : for (const auto& tx : setTxids) {
72 [ # # # # ]: 0 : const Coin& coin = AccessByTxid(active_chainstate.CoinsTip(), tx);
73 [ # # # # ]: 0 : if (!coin.IsSpent()) {
74 [ # # ]: 2 : pblockindex = active_chainstate.m_chain[coin.nHeight];
75 : 0 : break;
76 : : }
77 : : }
78 : 0 : }
79 : :
80 : :
81 : : // Allow txindex to catch up if we need to query it and before we acquire cs_main.
82 [ # # # # ]: 0 : if (g_txindex && !pblockindex) {
83 [ # # ]: 0 : g_txindex->BlockUntilSyncedToCurrentChain();
84 : 0 : }
85 : :
86 [ # # ]: 0 : if (pblockindex == nullptr) {
87 [ # # ]: 0 : const CTransactionRef tx = GetTransaction(/*block_index=*/nullptr, /*mempool=*/nullptr, *setTxids.begin(), hashBlock, chainman.m_blockman);
88 [ # # # # : 0 : if (!tx || hashBlock.IsNull()) {
# # ]
89 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not yet in block");
# # ]
90 : : }
91 : :
92 [ # # # # ]: 0 : LOCK(cs_main);
93 [ # # ]: 0 : pblockindex = chainman.m_blockman.LookupBlockIndex(hashBlock);
94 [ # # ]: 0 : if (!pblockindex) {
95 [ # # # # : 0 : throw JSONRPCError(RPC_INTERNAL_ERROR, "Transaction index corrupt");
# # ]
96 : : }
97 : 0 : }
98 : :
99 [ # # ]: 0 : CBlock block;
100 [ # # # # ]: 0 : if (!chainman.m_blockman.ReadBlockFromDisk(block, *pblockindex)) {
101 [ # # # # : 0 : throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
# # ]
102 : : }
103 : :
104 : 0 : unsigned int ntxFound = 0;
105 [ # # ]: 0 : for (const auto& tx : block.vtx) {
106 [ # # # # : 0 : if (setTxids.count(tx->GetHash())) {
# # ]
107 : 0 : ntxFound++;
108 : 0 : }
109 : : }
110 [ # # ]: 0 : if (ntxFound != setTxids.size()) {
111 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Not all transactions found in specified or retrieved block");
# # ]
112 : : }
113 : :
114 [ # # ]: 0 : DataStream ssMB{};
115 [ # # ]: 0 : CMerkleBlock mb(block, setTxids);
116 [ # # ]: 0 : ssMB << mb;
117 [ # # # # ]: 0 : std::string strHex = HexStr(ssMB);
118 [ # # ]: 0 : return strHex;
119 : 0 : },
120 : : };
121 : 0 : }
122 : :
123 : 2 : static RPCHelpMan verifytxoutproof()
124 : : {
125 [ + - - + : 4 : return RPCHelpMan{"verifytxoutproof",
# # # # ]
126 [ + - ]: 2 : "\nVerifies that a proof points to a transaction in a block, returning the transaction it commits to\n"
127 : : "and throwing an RPC error if the block is not in our best chain\n",
128 [ + - ]: 4 : {
129 [ + - + - : 2 : {"proof", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex-encoded proof generated by gettxoutproof"},
+ - ]
130 : : },
131 [ + - + - ]: 2 : RPCResult{
132 [ + - + - ]: 2 : RPCResult::Type::ARR, "", "",
133 [ + - ]: 4 : {
134 [ + - + - : 2 : {RPCResult::Type::STR_HEX, "txid", "The txid(s) which the proof commits to, or empty array if the proof cannot be validated."},
+ - ]
135 : : }
136 : : },
137 [ + - + - ]: 2 : RPCExamples{""},
138 [ + - ]: 2 : [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
139 : : {
140 [ # # # # : 0 : DataStream ssMB{ParseHexV(request.params[0], "proof")};
# # # # ]
141 [ # # ]: 0 : CMerkleBlock merkleBlock;
142 [ # # ]: 0 : ssMB >> merkleBlock;
143 : :
144 [ # # ]: 0 : UniValue res(UniValue::VARR);
145 : :
146 : 0 : std::vector<uint256> vMatch;
147 : 0 : std::vector<unsigned int> vIndex;
148 [ # # # # : 0 : if (merkleBlock.txn.ExtractMatches(vMatch, vIndex) != merkleBlock.header.hashMerkleRoot)
# # ]
149 : 0 : return res;
150 : :
151 [ # # ]: 0 : ChainstateManager& chainman = EnsureAnyChainman(request.context);
152 [ # # ]: 0 : LOCK(cs_main);
153 : :
154 [ # # # # ]: 0 : const CBlockIndex* pindex = chainman.m_blockman.LookupBlockIndex(merkleBlock.header.GetHash());
155 [ # # # # : 0 : if (!pindex || !chainman.ActiveChain().Contains(pindex) || pindex->nTx == 0) {
# # ]
156 [ # # # # : 0 : throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found in chain");
# # # # ]
157 : : }
158 : :
159 : : // Check if proof is valid, only add results if so
160 [ # # # # ]: 0 : if (pindex->nTx == merkleBlock.txn.GetNumTransactions()) {
161 [ # # ]: 0 : for (const uint256& hash : vMatch) {
162 [ # # # # : 0 : res.push_back(hash.GetHex());
# # ]
163 : : }
164 : 0 : }
165 : :
166 : 0 : return res;
167 [ # # ]: 0 : },
168 : : };
169 : 0 : }
170 : :
171 : 1 : void RegisterTxoutProofRPCCommands(CRPCTable& t)
172 : : {
173 [ + - - + : 3 : static const CRPCCommand commands[]{
# # ]
174 [ + - + - ]: 1 : {"blockchain", &gettxoutproof},
175 [ + - - + ]: 1 : {"blockchain", &verifytxoutproof},
176 : : };
177 [ + + ]: 3 : for (const auto& c : commands) {
178 : 2 : t.appendCommand(c.name, &c);
179 : : }
180 : 1 : }
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