net: merge AlreadyConnectedToAddress() and FindNode(CNetAddr)

`CConnman::AlreadyConnectedToAddress()` is the only caller of
`CConnman::FindNode(CNetAddr)`, so merge the two in one function.

The unit test that checked whether `AlreadyConnectedToAddress()` ignores
the port is now unnecessary because now the function takes a `CNetAddr`
argument. It has no access to the port.

src/net.cpp

@@ -331,17 +331,6 @@ bool IsLocal(const CService& addr)
     return mapLocalHost.count(addr) > 0;
 }
 
-CNode* CConnman::FindNode(const CNetAddr& ip)
-{
-    LOCK(m_nodes_mutex);
-    for (CNode* pnode : m_nodes) {
-      if (static_cast<CNetAddr>(pnode->addr) == ip) {
-            return pnode;
-        }
-    }
-    return nullptr;
-}
-
 CNode* CConnman::FindNode(const std::string& addrName)
 {
     LOCK(m_nodes_mutex);
@@ -364,9 +353,10 @@ CNode* CConnman::FindNode(const CService& addr)
     return nullptr;
 }
 
-bool CConnman::AlreadyConnectedToAddress(const CAddress& addr)
+bool CConnman::AlreadyConnectedToAddress(const CNetAddr& addr) const
 {
-    return FindNode(static_cast<CNetAddr>(addr));
+    LOCK(m_nodes_mutex);
+    return std::ranges::any_of(m_nodes, [&addr](CNode* node) { return node->addr == addr; });
 }
 
 bool CConnman::CheckIncomingNonce(uint64_t nonce)

src/net.h

@@ -1365,15 +1365,13 @@ private:
 
     uint64_t CalculateKeyedNetGroup(const CNetAddr& ad) const;
 
-    CNode* FindNode(const CNetAddr& ip);
     CNode* FindNode(const std::string& addrName);
     CNode* FindNode(const CService& addr);
 
     /**
-     * Determine whether we're already connected to a given address, in order to
-     * avoid initiating duplicate connections.
+     * Determine whether we're already connected to a given address.
      */
-    bool AlreadyConnectedToAddress(const CAddress& addr);
+    bool AlreadyConnectedToAddress(const CNetAddr& addr) const;
 
     bool AttemptToEvictConnection();
     CNode* ConnectNode(CAddress addrConnect, const char *pszDest, bool fCountFailure, ConnectionType conn_type, bool use_v2transport) EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);

src/test/net_peer_connection_tests.cpp

@@ -151,15 +151,8 @@ BOOST_FIXTURE_TEST_CASE(test_addnode_getaddednodeinfo_and_connection_detection,
     }
 
     BOOST_TEST_MESSAGE("\nCheck that all connected peers are correctly detected as connected");
-    for (auto node : connman->TestNodes()) {
-        BOOST_CHECK(connman->AlreadyConnectedPublic(node->addr));
-    }
-
-    BOOST_TEST_MESSAGE("\nCheck that peers with the same addresses as connected peers but different ports are detected as connected.");
-    for (auto node : connman->TestNodes()) {
-        uint16_t changed_port = node->addr.GetPort() + 1;
-        CService address_with_changed_port{node->addr, changed_port};
-        BOOST_CHECK(connman->AlreadyConnectedPublic(CAddress{address_with_changed_port, NODE_NONE}));
+    for (const auto& node : connman->TestNodes()) {
+        BOOST_CHECK(connman->AlreadyConnectedToAddressPublic(node->addr));
     }
 
     // Clean up

src/test/util/net.h

@@ -89,7 +89,7 @@ struct ConnmanTestMsg : public CConnman {
     bool ReceiveMsgFrom(CNode& node, CSerializedNetMsg&& ser_msg) const;
     void FlushSendBuffer(CNode& node) const;
 
-    bool AlreadyConnectedPublic(const CAddress& addr) { return AlreadyConnectedToAddress(addr); };
+    bool AlreadyConnectedToAddressPublic(const CNetAddr& addr) { return AlreadyConnectedToAddress(addr); };
 
     CNode* ConnectNodePublic(PeerManager& peerman, const char* pszDest, ConnectionType conn_type)
         EXCLUSIVE_LOCKS_REQUIRED(!m_unused_i2p_sessions_mutex);