Method AcceptConnection

src/net.cpp:1074–1153

}

void CConnman::AcceptConnection(const ListenSocket& hListenSocket) {
    struct sockaddr_storage sockaddr;
    socklen_t len = sizeof(sockaddr);
    SOCKET hSocket = accept(hListenSocket.socket, (struct sockaddr*)&sockaddr, &len);
    CAddress addr;
    int nInbound = 0;
    int nMaxInbound = nMaxConnections - (nMaxOutbound + nMaxFeeler);

    if (hSocket != INVALID_SOCKET) {
        if (!addr.SetSockAddr((const struct sockaddr*)&sockaddr)) {
            LogPrintf("Warning: Unknown socket family\n");
        }
    }

    bool whitelisted = hListenSocket.whitelisted || IsWhitelistedRange(addr);
    {
        LOCK(cs_vNodes);
        for (const CNode* pnode : vNodes) {
            if (pnode->fInbound) nInbound++;
        }
    }

    if (hSocket == INVALID_SOCKET)
    {
        int nErr = WSAGetLastError();
        if (nErr != WSAEWOULDBLOCK)
            LogPrintf("socket error accept failed: %s\n", NetworkErrorString(nErr));
        return;
    }

    if (!fNetworkActive) {
        LogPrintf("connection from %s dropped: not accepting new connections\n", addr.ToString());
        CloseSocket(hSocket);
        return;
    }

    if (!IsSelectableSocket(hSocket))
    {
        LogPrintf("connection from %s dropped: non-selectable socket\n", addr.ToString());
        CloseSocket(hSocket);
        return;
    }

    // According to the internet TCP_NODELAY is not carried into accepted sockets
    // on all platforms.  Set it again here just to be sure.
    SetSocketNoDelay(hSocket);

    if (IsBanned(addr) && !whitelisted)
    {
        LogPrint(BCLog::NET, "connection from %s dropped (banned)\n", addr.ToString());
        CloseSocket(hSocket);
        return;
    }

    if (nInbound >= nMaxInbound)
    {
        if (!AttemptToEvictConnection()) {
            // No connection to evict, disconnect the new connection