Merge #20724: Cleanup of -debug=net log messages

48c8a9b96453ca429b38fc5d5181a310ae5a93bf net_processing: log txrelay flag from version message (Anthony Towns)
98fab37ca0517bfe58296e47266cd5bd112e90bf net: use peer=N instead of from=N in debug log (Anthony Towns)
12302105bb0bf14721e91b7a3a9d1bf83c8d4154 net_processing: additional debug logging for ignored messages (Anthony Towns)
f7edea3b7c873d6c9bcd50cf528349ef84961a75 net: make debug logging conditional on -debug=net (Anthony Towns)
a410ae8cb09f1b809755316566f9e6bccd41c0c4 net, net_processing: log disconnect reasons with -debug=net (Anthony Towns)

Pull request description:

  A few changes to -debug=net logging:

   * always log when disconnecting a peer
   * only log various connection errors when -debug=net is enabled, since errors from random untrusted peers is completely expected
   * log when ignoring a message due to violating protocol (primarily to make it easier to debug other implementations)
   * use "peer=123" rather than "from 123" to make grepping logs a bit easier
   * log the value of the bip-37 `fRelay` field in version messages both when sending and receiving a version message

ACKs for top commit:
  jnewbery:
    ACK 48c8a9b96453ca429b38fc5d5181a310ae5a93bf
  MarcoFalke:
    re-ACK 48c8a9b96453ca429b38fc5d5181a310ae5a93bf only change is rebase 🚓
  practicalswift:
    re-ACK 48c8a9b96453ca429b38fc5d5181a310ae5a93bf

Tree-SHA512: 6ac530d883dffc4fd7fe20b1dc5ebb5394374c9b499aa7a253eb4a3a660d8901edd72e5ad21ce4a2bf71df25e8f142087755f9756f3497f564ef453a7e9246c1

2 files changed, 35 insertions, 14 deletions

diff --git a/src/net.cpp b/src/net.cpp
index 4759287c36..76bf7effa4 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -815,7 +815,7 @@ size_t CConnman::SocketSendData(CNode& node) const
                 // error
                 int nErr = WSAGetLastError();
                 if (nErr != WSAEWOULDBLOCK && nErr != WSAEMSGSIZE && nErr != WSAEINTR && nErr != WSAEINPROGRESS) {
-                    LogPrintf("socket send error %s\n", NetworkErrorString(nErr));
+                    LogPrint(BCLog::NET, "socket send error for peer=%d: %s\n", node.GetId(), NetworkErrorString(nErr));
                     node.CloseSocketDisconnect();
                 }
             }
@@ -1004,6 +1004,7 @@ bool CConnman::AttemptToEvictConnection()
     LOCK(cs_vNodes);
     for (CNode* pnode : vNodes) {
         if (pnode->GetId() == *node_id_to_evict) {
+            LogPrint(BCLog::NET, "selected %s connection for eviction peer=%d; disconnecting\n", pnode->ConnectionTypeAsString(), pnode->GetId());
             pnode->fDisconnect = true;
             return true;
         }
@@ -1052,7 +1053,7 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     }
 
     if (!fNetworkActive) {
-        LogPrintf("connection from %s dropped: not accepting new connections\n", addr.ToString());
+        LogPrint(BCLog::NET, "connection from %s dropped: not accepting new connections\n", addr.ToString());
         CloseSocket(hSocket);
         return;
     }
@@ -1230,17 +1231,17 @@ bool CConnman::InactivityCheck(const CNode& node) const
     }
 
     if (node.nLastRecv == 0 || node.nLastSend == 0) {
-        LogPrint(BCLog::NET, "socket no message in first %i seconds, %d %d from %d\n", m_peer_connect_timeout, node.nLastRecv != 0, node.nLastSend != 0, node.GetId());
+        LogPrint(BCLog::NET, "socket no message in first %i seconds, %d %d peer=%d\n", m_peer_connect_timeout, node.nLastRecv != 0, node.nLastSend != 0, node.GetId());
         return true;
     }
 
     if (now > node.nLastSend + TIMEOUT_INTERVAL) {
-        LogPrintf("socket sending timeout: %is\n", now - node.nLastSend);
+        LogPrint(BCLog::NET, "socket sending timeout: %is peer=%d\n", now - node.nLastSend, node.GetId());
         return true;
     }
 
     if (now > node.nLastRecv + TIMEOUT_INTERVAL) {
-        LogPrintf("socket receive timeout: %is\n", now - node.nLastRecv);
+        LogPrint(BCLog::NET, "socket receive timeout: %is peer=%d\n", now - node.nLastRecv, node.GetId());
         return true;
     }
 
@@ -1248,12 +1249,12 @@ bool CConnman::InactivityCheck(const CNode& node) const
         // We use mockable time for ping timeouts. This means that setmocktime
         // may cause pings to time out for peers that have been connected for
         // longer than m_peer_connect_timeout.
-        LogPrintf("ping timeout: %fs\n", 0.000001 * count_microseconds(GetTime<std::chrono::microseconds>() - node.m_ping_start.load()));
+        LogPrint(BCLog::NET, "ping timeout: %fs peer=%d\n", 0.000001 * count_microseconds(GetTime<std::chrono::microseconds>() - node.m_ping_start.load()), node.GetId());
         return true;
     }
 
     if (!node.fSuccessfullyConnected) {
-        LogPrint(BCLog::NET, "version handshake timeout from %d\n", node.GetId());
+        LogPrint(BCLog::NET, "version handshake timeout peer=%d\n", node.GetId());
         return true;
     }
 
@@ -2693,6 +2694,7 @@ bool CConnman::DisconnectNode(const std::string& strNode)
 {
     LOCK(cs_vNodes);
     if (CNode* pnode = FindNode(strNode)) {
+        LogPrint(BCLog::NET, "disconnect by address%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", strNode) : ""), pnode->GetId());
         pnode->fDisconnect = true;
         return true;
     }
@@ -2705,6 +2707,7 @@ bool CConnman::DisconnectNode(const CSubNet& subnet)
     LOCK(cs_vNodes);
     for (CNode* pnode : vNodes) {
         if (subnet.Match(pnode->addr)) {
+            LogPrint(BCLog::NET, "disconnect by subnet%s matched peer=%d; disconnecting\n", (fLogIPs ? strprintf("=%s", subnet.ToString()) : ""), pnode->GetId());
             pnode->fDisconnect = true;
             disconnected = true;
         }
@@ -2722,6 +2725,7 @@ bool CConnman::DisconnectNode(NodeId id)
     LOCK(cs_vNodes);
     for(CNode* pnode : vNodes) {
         if (id == pnode->GetId()) {
+            LogPrint(BCLog::NET, "disconnect by id peer=%d; disconnecting\n", pnode->GetId());
             pnode->fDisconnect = true;
             return true;
         }
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index cf73b1dae2..a4070f5b63 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -880,13 +880,14 @@ void PeerManagerImpl::PushNodeVersion(CNode& pnode, int64_t nTime)
                            CAddress(CService(), addr.nServices);
     CAddress addrMe = CAddress(CService(), nLocalNodeServices);
 
+    const bool tx_relay = !m_ignore_incoming_txs && pnode.m_tx_relay != nullptr;
     m_connman.PushMessage(&pnode, CNetMsgMaker(INIT_PROTO_VERSION).Make(NetMsgType::VERSION, PROTOCOL_VERSION, (uint64_t)nLocalNodeServices, nTime, addrYou, addrMe,
-            nonce, strSubVersion, nNodeStartingHeight, !m_ignore_incoming_txs && pnode.m_tx_relay != nullptr));
+            nonce, strSubVersion, nNodeStartingHeight, tx_relay));
 
     if (fLogIPs) {
-        LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, them=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), addrYou.ToString(), nodeid);
+        LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, them=%s, txrelay=%d, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), addrYou.ToString(), tx_relay, nodeid);
     } else {
-        LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), nodeid);
+        LogPrint(BCLog::NET, "send version message: version %d, blocks=%d, us=%s, txrelay=%d, peer=%d\n", PROTOCOL_VERSION, nNodeStartingHeight, addrMe.ToString(), tx_relay, nodeid);
     }
 }
 
@@ -2642,9 +2643,9 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         if (fLogIPs)
             remoteAddr = ", peeraddr=" + pfrom.addr.ToString();
 
-        LogPrint(BCLog::NET, "receive version message: %s: version %d, blocks=%d, us=%s, peer=%d%s\n",
+        LogPrint(BCLog::NET, "receive version message: %s: version %d, blocks=%d, us=%s, txrelay=%d, peer=%d%s\n",
                   cleanSubVer, pfrom.nVersion,
-                  peer->m_starting_height, addrMe.ToString(), pfrom.GetId(),
+                  peer->m_starting_height, addrMe.ToString(), fRelay, pfrom.GetId(),
                   remoteAddr);
 
         int64_t nTimeOffset = nTime - GetTime();
@@ -2659,6 +2660,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
         // Feeler connections exist only to verify if address is online.
         if (pfrom.IsFeelerConn()) {
+            LogPrint(BCLog::NET, "feeler connection completed peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
         }
         return;
@@ -2674,7 +2676,10 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
     const CNetMsgMaker msgMaker(pfrom.GetCommonVersion());
 
     if (msg_type == NetMsgType::VERACK) {
-        if (pfrom.fSuccessfullyConnected) return;
+        if (pfrom.fSuccessfullyConnected) {
+            LogPrint(BCLog::NET, "ignoring redundant verack message from peer=%d\n", pfrom.GetId());
+            return;
+        }
 
         if (!pfrom.IsInboundConn()) {
             LogPrintf("New outbound peer connected: version: %d, blocks=%d, peer=%d%s (%s)\n",
@@ -2746,6 +2751,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         if (pfrom.fSuccessfullyConnected) {
             // Disconnect peers that send wtxidrelay message after VERACK; this
             // must be negotiated between VERSION and VERACK.
+            LogPrint(BCLog::NET, "wtxidrelay received after verack from peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
             return;
         }
@@ -2754,7 +2760,11 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
             if (!State(pfrom.GetId())->m_wtxid_relay) {
                 State(pfrom.GetId())->m_wtxid_relay = true;
                 g_wtxid_relay_peers++;
+            } else {
+                LogPrint(BCLog::NET, "ignoring duplicate wtxidrelay from peer=%d\n", pfrom.GetId());
             }
+        } else {
+            LogPrint(BCLog::NET, "ignoring wtxidrelay due to old common version=%d from peer=%d\n", pfrom.GetCommonVersion(), pfrom.GetId());
         }
         return;
     }
@@ -2763,6 +2773,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         if (pfrom.fSuccessfullyConnected) {
             // Disconnect peers that send SENDADDRV2 message after VERACK; this
             // must be negotiated between VERSION and VERACK.
+            LogPrint(BCLog::NET, "sendaddrv2 received after verack from peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
             return;
         }
@@ -2789,6 +2800,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         s >> vAddr;
 
         if (!pfrom.RelayAddrsWithConn()) {
+            LogPrint(BCLog::NET, "ignoring %s message from %s peer=%d\n", msg_type, pfrom.ConnectionTypeAsString(), pfrom.GetId());
             return;
         }
         if (vAddr.size() > MAX_ADDR_TO_SEND)
@@ -2832,8 +2844,10 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
         m_connman.AddNewAddresses(vAddrOk, pfrom.addr, 2 * 60 * 60);
         if (vAddr.size() < 1000)
             pfrom.fGetAddr = false;
-        if (pfrom.IsAddrFetchConn())
+        if (pfrom.IsAddrFetchConn()) {
+            LogPrint(BCLog::NET, "addrfetch connection completed peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
+        }
         return;
     }
 
@@ -3840,6 +3854,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
     if (msg_type == NetMsgType::FILTERLOAD) {
         if (!(pfrom.GetLocalServices() & NODE_BLOOM)) {
+            LogPrint(BCLog::NET, "filterload received despite not offering bloom services from peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
             return;
         }
@@ -3862,6 +3877,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
     if (msg_type == NetMsgType::FILTERADD) {
         if (!(pfrom.GetLocalServices() & NODE_BLOOM)) {
+            LogPrint(BCLog::NET, "filteradd received despite not offering bloom services from peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
             return;
         }
@@ -3889,6 +3905,7 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
 
     if (msg_type == NetMsgType::FILTERCLEAR) {
         if (!(pfrom.GetLocalServices() & NODE_BLOOM)) {
+            LogPrint(BCLog::NET, "filterclear received despite not offering bloom services from peer=%d; disconnecting\n", pfrom.GetId());
             pfrom.fDisconnect = true;
             return;
         }