From e6a917c8f8e0f1a0fa71dc9bbb6e1074f81edea3 Mon Sep 17 00:00:00 2001
From: Vasil Dimov <vd@FreeBSD.org>
Date: Mon, 9 Jun 2025 13:29:19 +0200
Subject: [PATCH] fuzz: add Fuzzed NetEventsInterface and use it in connman
 tests

---
 src/test/fuzz/connman.cpp |  2 ++
 src/test/fuzz/util/net.h  | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/src/test/fuzz/connman.cpp b/src/test/fuzz/connman.cpp
index a62d227da8e..8513f07fead 100644
--- a/src/test/fuzz/connman.cpp
+++ b/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);
 
diff --git a/src/test/fuzz/util/net.h b/src/test/fuzz/util/net.h
index 698001a7f15..200638441ee 100644
--- a/src/test/fuzz/util/net.h
+++ b/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};