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-rw-r--r--src/net_processing.cpp18
1 files changed, 18 insertions, 0 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 6c26cd4cee..8551e84558 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -2383,6 +2383,24 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
}
}
}
+ // If we're in IBD, we want outbound peers that will serve us a useful
+ // chain. Disconnect peers that are on chains with insufficient work.
+ if (IsInitialBlockDownload() && nCount != MAX_HEADERS_RESULTS) {
+ // When nCount < MAX_HEADERS_RESULTS, we know we have no more
+ // headers to fetch from this peer.
+ if (nodestate->pindexBestKnownBlock && nodestate->pindexBestKnownBlock->nChainWork < nMinimumChainWork) {
+ // This peer has too little work on their headers chain to help
+ // us sync -- disconnect if using an outbound slot (unless
+ // whitelisted or addnode).
+ // Note: We compare their tip to nMinimumChainWork (rather than
+ // chainActive.Tip()) because we won't start block download
+ // until we have a headers chain that has at least
+ // nMinimumChainWork, even if a peer has a chain past our tip,
+ if (!(pfrom->fInbound || pfrom->fWhitelisted || pfrom->m_manual_connection)) {
+ pfrom->fDisconnect = true;
+ }
+ }
+ }
}
}