Merge pull request #5662

00dcaf4 Change download logic to allow calling getheaders/getdata on inbound peers (Suhas Daftuar)

src/main.cpp

@@ -4839,9 +4839,9 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
         if (pindexBestHeader == NULL)
             pindexBestHeader = chainActive.Tip();
         bool fFetch = state.fPreferredDownload || (nPreferredDownload == 0 && !pto->fClient && !pto->fOneShot); // Download if this is a nice peer, or we have no nice peers and this one might do.
-        if (!state.fSyncStarted && !pto->fClient && fFetch && !fImporting && !fReindex) {
+        if (!state.fSyncStarted && !pto->fClient && !fImporting && !fReindex) {
             // Only actively request headers from a single peer, unless we're close to today.
-            if (nSyncStarted == 0 || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) {
+            if ((nSyncStarted == 0 && fFetch) || pindexBestHeader->GetBlockTime() > GetAdjustedTime() - 24 * 60 * 60) {
                 state.fSyncStarted = true;
                 nSyncStarted++;
                 CBlockIndex *pindexStart = pindexBestHeader->pprev ? pindexBestHeader->pprev : pindexBestHeader;
@@ -4929,7 +4929,7 @@ bool SendMessages(CNode* pto, bool fSendTrickle)
         // Message: getdata (blocks)
         //
         vector<CInv> vGetData;
-        if (!pto->fDisconnect && !pto->fClient && fFetch && state.nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
+        if (!pto->fDisconnect && !pto->fClient && (fFetch || !IsInitialBlockDownload()) && state.nBlocksInFlight < MAX_BLOCKS_IN_TRANSIT_PER_PEER) {
             vector<CBlockIndex*> vToDownload;
             NodeId staller = -1;
             FindNextBlocksToDownload(pto->GetId(), MAX_BLOCKS_IN_TRANSIT_PER_PEER - state.nBlocksInFlight, vToDownload, staller);