fuzz: add CConnman::SocketHandler() to the tests

Author: vasild

src/test/fuzz/connman.cpp

@@ -57,6 +57,7 @@ struct CConnmanTest : public CConnman {
         return InitBinds(binds, white_binds, onion_binds);
     }
 
+    void SocketHandlerPublic() { SocketHandler(); }
 };
 
 FUZZ_TARGET_INIT(connman, initialize_connman)
@@ -70,6 +71,23 @@ FUZZ_TARGET_INIT(connman, initialize_connman)
         return std::make_unique<FuzzedSock>(fuzzed_data_provider);
     };
 
+    // Mock SockWaitMany(), pretending random sockets are ready for the requested IO.
+    auto SockWaitManyOrig = SockWaitMany;
+    SockWaitMany = [&fuzzed_data_provider](Sockets& sockets, std::chrono::milliseconds) {
+        auto RemoveRandomElements = [&fuzzed_data_provider](auto& set) {
+            for (auto it = set.begin(); it != set.end();) {
+                if (fuzzed_data_provider.ConsumeBool()) {
+                    it = set.erase(it);
+                } else {
+                    ++it;
+                }
+            }
+        };
+        RemoveRandomElements(sockets.recv);
+        RemoveRandomElements(sockets.send);
+        RemoveRandomElements(sockets.err);
+    };
+
     CConnmanTest connman{fuzzed_data_provider, *g_setup->m_node.addrman};
     CConnman::Options options;
     options.m_msgproc = g_setup->m_node.peerman.get();
@@ -210,6 +228,9 @@ FUZZ_TARGET_INIT(connman, initialize_connman)
                 }
 
                 connman.InitBindsPublic(binds, white_binds, onion_binds);
+            },
+            [&] {
+                connman.SocketHandlerPublic();
             });
     }
     (void)connman.GetAddedNodeInfo();
@@ -228,5 +249,6 @@ FUZZ_TARGET_INIT(connman, initialize_connman)
     (void)connman.GetTryNewOutboundPeer();
     (void)connman.GetUseAddrmanOutgoing();
 
+    SockWaitMany = SockWaitManyOrig;
     CreateSock = CreateSockOrig;
 }