diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/net_processing.cpp | 86 | ||||
| -rw-r--r-- | src/protocol.cpp | 4 | ||||
| -rw-r--r-- | src/protocol.h | 15 |
3 files changed, 100 insertions, 5 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 9d9e31d3ed..9f7bde89cf 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -129,6 +129,8 @@ static constexpr unsigned int INVENTORY_BROADCAST_MAX = 7 * INVENTORY_BROADCAST_ static constexpr unsigned int AVG_FEEFILTER_BROADCAST_INTERVAL = 10 * 60; /** Maximum feefilter broadcast delay after significant change. */ static constexpr unsigned int MAX_FEEFILTER_CHANGE_DELAY = 5 * 60; +/** Maximum number of cf hashes that may be requested with one getcfheaders. See BIP 157. */ +static constexpr uint32_t MAX_GETCFHEADERS_SIZE = 2000; struct COrphanTx { // When modifying, adapt the copy of this definition in tests/DoS_tests. @@ -1983,14 +1985,16 @@ void static ProcessOrphanTx(CConnman* connman, CTxMemPool& mempool, std::set<uin * @param[in] pfrom The peer that we received the request from * @param[in] chain_params Chain parameters * @param[in] filter_type The filter type the request is for. Must be basic filters. + * @param[in] start_height The start height for the request * @param[in] stop_hash The stop_hash for the request + * @param[in] max_height_diff The maximum number of items permitted to request, as specified in BIP 157 * @param[out] stop_index The CBlockIndex for the stop_hash block, if the request can be serviced. * @param[out] filter_index The filter index, if the request can be serviced. * @return True if the request can be serviced. */ static bool PrepareBlockFilterRequest(CNode* pfrom, const CChainParams& chain_params, - BlockFilterType filter_type, - const uint256& stop_hash, + BlockFilterType filter_type, uint32_t start_height, + const uint256& stop_hash, uint32_t max_height_diff, const CBlockIndex*& stop_index, BlockFilterIndex*& filter_index) { @@ -2017,6 +2021,21 @@ static bool PrepareBlockFilterRequest(CNode* pfrom, const CChainParams& chain_pa } } + uint32_t stop_height = stop_index->nHeight; + if (start_height > stop_height) { + LogPrint(BCLog::NET, "peer %d sent invalid getcfilters/getcfheaders with " /* Continued */ + "start height %d and stop height %d\n", + pfrom->GetId(), start_height, stop_height); + pfrom->fDisconnect = true; + return false; + } + if (stop_height - start_height >= max_height_diff) { + LogPrint(BCLog::NET, "peer %d requested too many cfilters/cfheaders: %d / %d\n", + pfrom->GetId(), stop_height - start_height + 1, max_height_diff); + pfrom->fDisconnect = true; + return false; + } + filter_index = GetBlockFilterIndex(filter_type); if (!filter_index) { LogPrint(BCLog::NET, "Filter index for supported type %s not found\n", BlockFilterTypeName(filter_type)); @@ -2027,6 +2046,61 @@ static bool PrepareBlockFilterRequest(CNode* pfrom, const CChainParams& chain_pa } /** + * Handle a cfheaders request. + * + * May disconnect from the peer in the case of a bad request. + * + * @param[in] pfrom The peer that we received the request from + * @param[in] vRecv The raw message received + * @param[in] chain_params Chain parameters + * @param[in] connman Pointer to the connection manager + */ +static void ProcessGetCFHeaders(CNode* pfrom, CDataStream& vRecv, const CChainParams& chain_params, + CConnman* connman) +{ + uint8_t filter_type_ser; + uint32_t start_height; + uint256 stop_hash; + + vRecv >> filter_type_ser >> start_height >> stop_hash; + + const BlockFilterType filter_type = static_cast<BlockFilterType>(filter_type_ser); + + const CBlockIndex* stop_index; + BlockFilterIndex* filter_index; + if (!PrepareBlockFilterRequest(pfrom, chain_params, filter_type, start_height, stop_hash, + MAX_GETCFHEADERS_SIZE, stop_index, filter_index)) { + return; + } + + uint256 prev_header; + if (start_height > 0) { + const CBlockIndex* const prev_block = + stop_index->GetAncestor(static_cast<int>(start_height - 1)); + if (!filter_index->LookupFilterHeader(prev_block, prev_header)) { + LogPrint(BCLog::NET, "Failed to find block filter header in index: filter_type=%s, block_hash=%s\n", + BlockFilterTypeName(filter_type), prev_block->GetBlockHash().ToString()); + return; + } + } + + std::vector<uint256> filter_hashes; + if (!filter_index->LookupFilterHashRange(start_height, stop_index, filter_hashes)) { + LogPrint(BCLog::NET, "Failed to find block filter hashes in index: filter_type=%s, start_height=%d, stop_hash=%s\n", + BlockFilterTypeName(filter_type), start_height, stop_hash.ToString()); + return; + } + + CSerializedNetMsg msg = CNetMsgMaker(pfrom->GetSendVersion()) + .Make(NetMsgType::CFHEADERS, + filter_type_ser, + stop_index->GetBlockHash(), + prev_header, + filter_hashes); + connman->PushMessage(pfrom, std::move(msg)); +} + +/** * Handle a getcfcheckpt request. * * May disconnect from the peer in the case of a bad request. @@ -2048,7 +2122,8 @@ static void ProcessGetCFCheckPt(CNode* pfrom, CDataStream& vRecv, const CChainPa const CBlockIndex* stop_index; BlockFilterIndex* filter_index; - if (!PrepareBlockFilterRequest(pfrom, chain_params, filter_type, stop_hash, + if (!PrepareBlockFilterRequest(pfrom, chain_params, filter_type, /*start_height=*/0, stop_hash, + /*max_height_diff=*/std::numeric_limits<uint32_t>::max(), stop_index, filter_index)) { return; } @@ -3385,6 +3460,11 @@ bool ProcessMessage(CNode* pfrom, const std::string& msg_type, CDataStream& vRec return true; } + if (msg_type == NetMsgType::GETCFHEADERS) { + ProcessGetCFHeaders(pfrom, vRecv, chainparams, connman); + return true; + } + if (msg_type == NetMsgType::GETCFCHECKPT) { ProcessGetCFCheckPt(pfrom, vRecv, chainparams, connman); return true; diff --git a/src/protocol.cpp b/src/protocol.cpp index e929cff110..243111c449 100644 --- a/src/protocol.cpp +++ b/src/protocol.cpp @@ -40,6 +40,8 @@ const char *SENDCMPCT="sendcmpct"; const char *CMPCTBLOCK="cmpctblock"; const char *GETBLOCKTXN="getblocktxn"; const char *BLOCKTXN="blocktxn"; +const char *GETCFHEADERS="getcfheaders"; +const char *CFHEADERS="cfheaders"; const char *GETCFCHECKPT="getcfcheckpt"; const char *CFCHECKPT="cfcheckpt"; } // namespace NetMsgType @@ -73,6 +75,8 @@ const static std::string allNetMessageTypes[] = { NetMsgType::CMPCTBLOCK, NetMsgType::GETBLOCKTXN, NetMsgType::BLOCKTXN, + NetMsgType::GETCFHEADERS, + NetMsgType::CFHEADERS, NetMsgType::GETCFCHECKPT, NetMsgType::CFCHECKPT, }; diff --git a/src/protocol.h b/src/protocol.h index 8092ad7c13..9527dce960 100644 --- a/src/protocol.h +++ b/src/protocol.h @@ -226,6 +226,19 @@ extern const char* GETBLOCKTXN; */ extern const char* BLOCKTXN; /** + * getcfheaders requests a compact filter header and the filter hashes for a + * range of blocks, which can then be used to reconstruct the filter headers + * for those blocks. + * Only available with service bit NODE_COMPACT_FILTERS as described by + * BIP 157 & 158. + */ +extern const char* GETCFHEADERS; +/** + * cfheaders is a response to a getcfheaders request containing a filter header + * and a vector of filter hashes for each subsequent block in the requested range. + */ +extern const char* CFHEADERS; +/** * getcfcheckpt requests evenly spaced compact filter headers, enabling * parallelized download and validation of the headers between them. * Only available with service bit NODE_COMPACT_FILTERS as described by @@ -235,8 +248,6 @@ extern const char* GETCFCHECKPT; /** * cfcheckpt is a response to a getcfcheckpt request containing a vector of * evenly spaced filter headers for blocks on the requested chain. - * Only available with service bit NODE_COMPACT_FILTERS as described by - * BIP 157 & 158. */ extern const char* CFCHECKPT; }; // namespace NetMsgType |