p2p: Log addresses of stalling peers

This allows node operators that have the -logips option enabled
to better identify potentially misbehaving peers and maybe
ban them.

Author: mzumsande

src/net_processing.cpp

@@ -5751,7 +5751,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
             // Stalling only triggers when the block download window cannot move. During normal steady state,
             // the download window should be much larger than the to-be-downloaded set of blocks, so disconnection
             // should only happen during initial block download.
-            LogPrintf("Peer=%d is stalling block download, disconnecting\n", pto->GetId());
+            LogPrintf("Peer=%d%s is stalling block download, disconnecting\n", pto->GetId(), fLogIPs ? strprintf(" peeraddr=%s", pto->addr.ToStringAddrPort()) : "");
             pto->fDisconnect = true;
             // Increase timeout for the next peer so that we don't disconnect multiple peers if our own
             // bandwidth is insufficient.
@@ -5770,7 +5770,7 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
             QueuedBlock &queuedBlock = state.vBlocksInFlight.front();
             int nOtherPeersWithValidatedDownloads = m_peers_downloading_from - 1;
             if (current_time > state.m_downloading_since + std::chrono::seconds{consensusParams.nPowTargetSpacing} * (BLOCK_DOWNLOAD_TIMEOUT_BASE + BLOCK_DOWNLOAD_TIMEOUT_PER_PEER * nOtherPeersWithValidatedDownloads)) {
-                LogPrintf("Timeout downloading block %s from peer=%d, disconnecting\n", queuedBlock.pindex->GetBlockHash().ToString(), pto->GetId());
+                LogPrintf("Timeout downloading block %s from peer=%d%s, disconnecting\n", queuedBlock.pindex->GetBlockHash().ToString(), pto->GetId(), fLogIPs ? strprintf(" peeraddr=%s", pto->addr.ToStringAddrPort()) : "");
                 pto->fDisconnect = true;
                 return true;
             }
@@ -5786,11 +5786,11 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
                     // disconnect our sync peer for stalling; we have bigger
                     // problems if we can't get any outbound peers.
                     if (!pto->HasPermission(NetPermissionFlags::NoBan)) {
-                        LogPrintf("Timeout downloading headers from peer=%d, disconnecting\n", pto->GetId());
+                        LogPrintf("Timeout downloading headers from peer=%d%s, disconnecting\n", pto->GetId(), fLogIPs ? strprintf(" peeraddr=%s", pto->addr.ToStringAddrPort()) : "");
                         pto->fDisconnect = true;
                         return true;
                     } else {
-                        LogPrintf("Timeout downloading headers from noban peer=%d, not disconnecting\n", pto->GetId());
+                        LogPrintf("Timeout downloading headers from noban peer=%d%s, not disconnecting\n", pto->GetId(), fLogIPs ? strprintf(" peeraddr=%s", pto->addr.ToStringAddrPort()) : "");
                         // Reset the headers sync state so that we have a
                         // chance to try downloading from a different peer.
                         // Note: this will also result in at least one more