fuzz: Add process_messages harness

src/test/util/net.cpp

@@ -0,0 +1,39 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/util/net.h>
+
+#include <chainparams.h>
+#include <net.h>
+
+void ConnmanTestMsg::NodeReceiveMsgBytes(CNode& node, const char* pch, unsigned int nBytes, bool& complete) const
+{
+    assert(node.ReceiveMsgBytes(pch, nBytes, complete));
+    if (complete) {
+        size_t nSizeAdded = 0;
+        auto it(node.vRecvMsg.begin());
+        for (; it != node.vRecvMsg.end(); ++it) {
+            // vRecvMsg contains only completed CNetMessage
+            // the single possible partially deserialized message are held by TransportDeserializer
+            nSizeAdded += it->m_raw_message_size;
+        }
+        {
+            LOCK(node.cs_vProcessMsg);
+            node.vProcessMsg.splice(node.vProcessMsg.end(), node.vRecvMsg, node.vRecvMsg.begin(), it);
+            node.nProcessQueueSize += nSizeAdded;
+            node.fPauseRecv = node.nProcessQueueSize > nReceiveFloodSize;
+        }
+    }
+}
+
+bool ConnmanTestMsg::ReceiveMsgFrom(CNode& node, CSerializedNetMsg& ser_msg) const
+{
+    std::vector<unsigned char> ser_msg_header;
+    node.m_serializer->prepareForTransport(ser_msg, ser_msg_header);
+
+    bool complete;
+    NodeReceiveMsgBytes(node, (const char*)ser_msg_header.data(), ser_msg_header.size(), complete);
+    NodeReceiveMsgBytes(node, (const char*)ser_msg.data.data(), ser_msg.data.size(), complete);
+    return complete;
+}

src/test/util/net.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_TEST_UTIL_NET_H
+#define BITCOIN_TEST_UTIL_NET_H
+
+#include <net.h>
+
+struct ConnmanTestMsg : public CConnman {
+    using CConnman::CConnman;
+    void AddTestNode(CNode& node)
+    {
+        LOCK(cs_vNodes);
+        vNodes.push_back(&node);
+    }
+    void ClearTestNodes()
+    {
+        LOCK(cs_vNodes);
+        for (CNode* node : vNodes) {
+            delete node;
+        }
+        vNodes.clear();
+    }
+
+    void ProcessMessagesOnce(CNode& node) { m_msgproc->ProcessMessages(&node, flagInterruptMsgProc); }
+
+    void NodeReceiveMsgBytes(CNode& node, const char* pch, unsigned int nBytes, bool& complete) const;
+
+    bool ReceiveMsgFrom(CNode& node, CSerializedNetMsg& ser_msg) const;
+};
+
+#endif // BITCOIN_TEST_UTIL_NET_H

src/test/util/setup_common.cpp

@@ -139,6 +139,11 @@ TestingSetup::TestingSetup(const std::string& chainName) : BasicTestingSetup(cha
     m_node.banman = MakeUnique<BanMan>(GetDataDir() / "banlist.dat", nullptr, DEFAULT_MISBEHAVING_BANTIME);
     m_node.connman = MakeUnique<CConnman>(0x1337, 0x1337); // Deterministic randomness for tests.
     m_node.peer_logic = MakeUnique<PeerLogicValidation>(m_node.connman.get(), m_node.banman.get(), *m_node.scheduler, *m_node.mempool);
+    {
+        CConnman::Options options;
+        options.m_msgproc = m_node.peer_logic.get();
+        m_node.connman->Init(options);
+    }
 }
 
 TestingSetup::~TestingSetup()