net: isolate the protocol-agnostic part of CConnman::AcceptConnection()

Isolate the second half of `CConnman::AcceptConnection()` into a new
separate method, which could be reused if we accept incoming connections
by other means than `accept()` (first half of
`CConnman::AcceptConnection()`).

Author: vasild

src/net.cpp

@@ -1005,8 +1005,6 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
     socklen_t len = sizeof(sockaddr);
     SOCKET hSocket = accept(hListenSocket.socket, (struct sockaddr*)&sockaddr, &len);
     CAddress addr;
-    int nInbound = 0;
-    int nMaxInbound = nMaxConnections - m_max_outbound;
 
     if (hSocket == INVALID_SOCKET) {
         const int nErr = WSAGetLastError();
@@ -1024,6 +1022,18 @@ void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
 
     NetPermissionFlags permissionFlags = NetPermissionFlags::PF_NONE;
     hListenSocket.AddSocketPermissionFlags(permissionFlags);
+
+    CreateNodeFromAcceptedSocket(hSocket, permissionFlags, addr_bind, addr);
+}
+
+void CConnman::CreateNodeFromAcceptedSocket(SOCKET hSocket,
+                                            NetPermissionFlags permissionFlags,
+                                            const CAddress& addr_bind,
+                                            const CAddress& addr)
+{
+    int nInbound = 0;
+    int nMaxInbound = nMaxConnections - m_max_outbound;
+
     AddWhitelistPermissionFlags(permissionFlags, addr);
     if (NetPermissions::HasFlag(permissionFlags, NetPermissionFlags::PF_ISIMPLICIT)) {
         NetPermissions::ClearFlag(permissionFlags, PF_ISIMPLICIT);

src/net.h

@@ -1049,6 +1049,20 @@ class CConnman
     void ThreadOpenConnections(std::vector<std::string> connect);
     void ThreadMessageHandler();
     void AcceptConnection(const ListenSocket& hListenSocket);
+
+    /**
+     * Create a `CNode` object from a socket that has just been accepted and add the node to
+     * the `vNodes` member.
+     * @param[in] hSocket Connected socket to communicate with the peer.
+     * @param[in] permissionFlags The peer's permissions.
+     * @param[in] addr_bind The address and port at our side of the connection.
+     * @param[in] addr The address and port at the peer's side of the connection.
+     */
+    void CreateNodeFromAcceptedSocket(SOCKET hSocket,
+                                      NetPermissionFlags permissionFlags,
+                                      const CAddress& addr_bind,
+                                      const CAddress& addr);
+
     void DisconnectNodes();
     void NotifyNumConnectionsChanged();
     /** Return true if the peer is inactive and should be disconnected. */