fuzz: add Fuzzed NetEventsInterface and use it in connman tests

src/test/fuzz/connman.cpp

@@ -51,6 +51,7 @@ FUZZ_TARGET(connman, .init = initialize_connman)
         }
     }
     AddrManDeterministic& addr_man{*addr_man_ptr};
+    auto net_events{ConsumeNetEvents(fuzzed_data_provider)};
     ConnmanTestMsg connman{fuzzed_data_provider.ConsumeIntegral<uint64_t>(),
                      fuzzed_data_provider.ConsumeIntegral<uint64_t>(),
                      addr_man,
@@ -60,6 +61,7 @@ FUZZ_TARGET(connman, .init = initialize_connman)
 
     const uint64_t max_outbound_limit{fuzzed_data_provider.ConsumeIntegral<uint64_t>()};
     CConnman::Options options;
+    options.m_msgproc = &net_events;
     options.nMaxOutboundLimit = max_outbound_limit;
     connman.Init(options);
 

src/test/fuzz/util/net.h

@@ -139,6 +139,25 @@ public:
     }
 };
 
+class FuzzedNetEvents : public NetEventsInterface
+{
+public:
+    FuzzedNetEvents(FuzzedDataProvider& fdp) : m_fdp(fdp) {}
+
+    virtual void InitializeNode(const CNode&, ServiceFlags) override {}
+
+    virtual void FinalizeNode(const CNode&) override {}
+
+    virtual bool HasAllDesirableServiceFlags(ServiceFlags) const override { return m_fdp.ConsumeBool(); }
+
+    virtual bool ProcessMessages(CNode*, std::atomic<bool>&) override { return m_fdp.ConsumeBool(); }
+
+    virtual bool SendMessages(CNode*) override { return m_fdp.ConsumeBool(); }
+
+private:
+    FuzzedDataProvider& m_fdp;
+};
+
 class FuzzedSock : public Sock
 {
     FuzzedDataProvider& m_fuzzed_data_provider;
@@ -203,6 +222,11 @@ public:
     bool IsConnected(std::string& errmsg) const override;
 };
 
+[[nodiscard]] inline FuzzedNetEvents ConsumeNetEvents(FuzzedDataProvider& fdp) noexcept
+{
+    return FuzzedNetEvents{fdp};
+}
+
 [[nodiscard]] inline FuzzedSock ConsumeSock(FuzzedDataProvider& fuzzed_data_provider)
 {
     return FuzzedSock{fuzzed_data_provider};