diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/init.cpp | 2 | ||||
| -rw-r--r-- | src/net_processing.cpp | 10 | ||||
| -rw-r--r-- | src/protocol.h | 9 | ||||
| -rw-r--r-- | src/validation.h | 2 |
4 files changed, 19 insertions, 4 deletions
diff --git a/src/init.cpp b/src/init.cpp index 871a585267..67e01c9ba9 100644 --- a/src/init.cpp +++ b/src/init.cpp @@ -816,7 +816,7 @@ namespace { // Variables internal to initialization process only int nMaxConnections; int nUserMaxConnections; int nFD; -ServiceFlags nLocalServices = NODE_NETWORK; +ServiceFlags nLocalServices = ServiceFlags(NODE_NETWORK | NODE_NETWORK_LIMITED); } // namespace diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 442cd00c9b..85e6d9c73d 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -1091,6 +1091,16 @@ void static ProcessGetData(CNode* pfrom, const Consensus::Params& consensusParam pfrom->fDisconnect = true; send = false; } + // Avoid leaking prune-height by never sending blocks below the NODE_NETWORK_LIMITED threshold + if (send && !pfrom->fWhitelisted && ( + (((pfrom->GetLocalServices() & NODE_NETWORK_LIMITED) == NODE_NETWORK_LIMITED) && ((pfrom->GetLocalServices() & NODE_NETWORK) != NODE_NETWORK) && (chainActive.Tip()->nHeight - mi->second->nHeight > (int)NODE_NETWORK_LIMITED_MIN_BLOCKS + 2 /* add two blocks buffer extension for possible races */) ) + )) { + LogPrint(BCLog::NET, "Ignore block request below NODE_NETWORK_LIMITED threshold from peer=%d\n", pfrom->GetId()); + + //disconnect node and prevent it from stalling (would otherwise wait for the missing block) + pfrom->fDisconnect = true; + send = false; + } // Pruned nodes may have deleted the block, so check whether // it's available before trying to send. if (send && (mi->second->nStatus & BLOCK_HAVE_DATA)) diff --git a/src/protocol.h b/src/protocol.h index bc31434515..cf1d40db77 100644 --- a/src/protocol.h +++ b/src/protocol.h @@ -246,9 +246,8 @@ const std::vector<std::string> &getAllNetMessageTypes(); enum ServiceFlags : uint64_t { // Nothing NODE_NONE = 0, - // NODE_NETWORK means that the node is capable of serving the block chain. It is currently - // set by all Bitcoin Core nodes, and is unset by SPV clients or other peers that just want - // network services but don't provide them. + // NODE_NETWORK means that the node is capable of serving the complete block chain. It is currently + // set by all Bitcoin Core non pruned nodes, and is unset by SPV clients or other light clients. NODE_NETWORK = (1 << 0), // NODE_GETUTXO means the node is capable of responding to the getutxo protocol request. // Bitcoin Core does not support this but a patch set called Bitcoin XT does. @@ -264,6 +263,10 @@ enum ServiceFlags : uint64_t { // NODE_XTHIN means the node supports Xtreme Thinblocks // If this is turned off then the node will not service nor make xthin requests NODE_XTHIN = (1 << 4), + // NODE_NETWORK_LIMITED means the same as NODE_NETWORK with the limitation of only + // serving the last 288 (2 day) blocks + // See BIP159 for details on how this is implemented. + NODE_NETWORK_LIMITED = (1 << 10), // Bits 24-31 are reserved for temporary experiments. Just pick a bit that // isn't getting used, or one not being used much, and notify the diff --git a/src/validation.h b/src/validation.h index ec17d0d92d..49bff9f30c 100644 --- a/src/validation.h +++ b/src/validation.h @@ -203,6 +203,8 @@ extern bool fPruneMode; extern uint64_t nPruneTarget; /** Block files containing a block-height within MIN_BLOCKS_TO_KEEP of chainActive.Tip() will not be pruned. */ static const unsigned int MIN_BLOCKS_TO_KEEP = 288; +/** Minimum blocks required to signal NODE_NETWORK_LIMITED */ +static const unsigned int NODE_NETWORK_LIMITED_MIN_BLOCKS = 288; static const signed int DEFAULT_CHECKBLOCKS = 6; static const unsigned int DEFAULT_CHECKLEVEL = 3; |