C++ HostAddress::GetIPv4Address方法代码示例

bool TcpSocketEngine::nativeConnect(const HostAddress& address, const uint16_t port) {

    // setup connection parameters from address/port
    sockaddr_in  sockAddrIPv4;
    sockaddr_in6 sockAddrIPv6;
    sockaddr*    sockAddrPtr  = 0;
    BT_SOCKLEN_T sockAddrSize = 0;

    // IPv6
    if ( address.GetProtocol() == HostAddress::IPv6Protocol ) {

        memset(&sockAddrIPv6, 0, sizeof(sockAddrIPv6));
        sockAddrIPv6.sin6_family = AF_INET6;
        sockAddrIPv6.sin6_port   = htons(port);

        IPv6Address ip6 = address.GetIPv6Address();
        memcpy(&sockAddrIPv6.sin6_addr.s6_addr, &ip6, sizeof(ip6));

        sockAddrSize = sizeof(sockAddrIPv6);
        sockAddrPtr  = (sockaddr*)&sockAddrIPv6;
    }

    // IPv4
    else if ( address.GetProtocol() == HostAddress::IPv4Protocol ) {

        memset(&sockAddrIPv4, 0, sizeof(sockAddrIPv4));
        sockAddrIPv4.sin_family      = AF_INET;
        sockAddrIPv4.sin_port        = htons(port);
        sockAddrIPv4.sin_addr.s_addr = htonl(address.GetIPv4Address());

        sockAddrSize = sizeof(sockAddrIPv4);
        sockAddrPtr  = (sockaddr*)&sockAddrIPv4;
    }

    // unknown (should be unreachable)
    else BT_ASSERT_X(false, "TcpSocketEngine::nativeConnect() : unknown network protocol");

    // attempt connection
    int connectResult = connect(m_socketDescriptor, sockAddrPtr, sockAddrSize);

    // if failed, handle error
    if ( connectResult == -1 ) {

        // ensure state is set before checking errno
        m_socketState = TcpSocket::UnconnectedState;

        // set error type/message depending on errno
        switch ( errno ) { // <-- potential thread issues later? but can't get error type from connectResult

            case EISCONN:
                m_socketState = TcpSocket::ConnectedState; // socket was already connected
                break;
            case ECONNREFUSED:
            case EINVAL:
                m_socketError = TcpSocket::ConnectionRefusedError;
                m_errorString = "connection refused";
                break;
            case ETIMEDOUT:
                m_socketError = TcpSocket::NetworkError;
                m_errorString = "connection timed out";
                break;
            case EHOSTUNREACH:
                m_socketError = TcpSocket::NetworkError;
                m_errorString = "host unreachable";
                break;
            case ENETUNREACH:
                m_socketError = TcpSocket::NetworkError;
                m_errorString = "network unreachable";
                break;
            case EADDRINUSE:
                m_socketError = TcpSocket::SocketResourceError;
                m_errorString = "address already in use";
                break;
            case EACCES:
            case EPERM:
                m_socketError = TcpSocket::SocketAccessError;
                m_errorString = "permission denied";
                break;
            default:
                break;
        }

        // double check that we're not in 'connected' state; if so, return failure
        if ( m_socketState != TcpSocket::ConnectedState )
            return false;
    }

    // otherwise, we should be good
    // update state & return success
    m_socketState = TcpSocket::ConnectedState;
    return true;
}

HostInfo HostInfo::Lookup(const string& hostname, const string& port) {

    HostInfo result;
    result.SetHostName(hostname);
    set<HostAddress> uniqueAddresses;

#ifdef _WIN32
    WindowsSockInit init;
#endif

    HostAddress address;
    address.SetAddress(hostname);

    // if hostname is an IP string ('0.0.0.0' or IPv6 format)
    // do reverse lookup for host domain name
    //
    // TODO: might just remove this... not sure if proper 'hostname' from IP string is needed
    //
    //       so far, haven't been able to successfully fetch a domain name with reverse DNS
    //       getnameinfo() on test sites just returns original IP string. BUT this is likely a rare
    //       case that client code tries to use an IP string and the connection should work fine
    //       anyway. GetHostName() just won't quite show what I was hoping for. :(
    if ( address.HasIPAddress() ) {

        const uint16_t portNum = static_cast<uint16_t>( atoi(port.c_str()) );

        sockaddr_in  sa4;
        sockaddr_in6 sa6;
        sockaddr* sa = 0;
        BT_SOCKLEN_T saSize = 0;

        // IPv4
        if ( address.GetProtocol() == HostAddress::IPv4Protocol ) {
            sa = (sockaddr*)&sa4;
            saSize = sizeof(sa4);
            memset(&sa4, 0, sizeof(sa4));
            sa4.sin_family = AF_INET;
            sa4.sin_addr.s_addr = htonl(address.GetIPv4Address());
            sa4.sin_port = htons(portNum);
        }

        // IPv6
        else if ( address.GetProtocol() == HostAddress::IPv4Protocol ){
            sa = (sockaddr*)&sa6;
            saSize = sizeof(sa6);
            memset(&sa6, 0, sizeof(sa6));
            sa6.sin6_family = AF_INET6;
            memcpy(sa6.sin6_addr.s6_addr, address.GetIPv6Address().data, sizeof(sa6.sin6_addr.s6_addr));
            sa6.sin6_port = htons(portNum);
        }

        // unknown (should be unreachable)
        else BT_ASSERT_X(false, "HostInfo::Lookup: unknown network protocol");

        // lookup name for IP
        char hbuf[NI_MAXHOST];
        char serv[NI_MAXSERV];
        if ( sa && (getnameinfo(sa, saSize, hbuf, sizeof(hbuf), serv, sizeof(serv), 0) == 0) )
            result.SetHostName(string(hbuf));

        // if no domain name found, just use the original address's IP string
        if ( result.HostName().empty() )
            result.SetHostName(address.GetIPString());

        // store address in HostInfo
        uniqueAddresses.insert(address);
    }

    // otherwise, hostname is a domain name ('www.foo.bar')
    // do 'normal' lookup
    else {

        // setup address lookup 'hints'
        addrinfo hints;
        memset(&hints, 0, sizeof(hints));
        hints.ai_family   = AF_UNSPEC;   // allow either IPv4 or IPv6
        hints.ai_socktype = SOCK_STREAM; // for TCP
        hints.ai_protocol = IPPROTO_TCP;

        // fetch addresses for requested hostname/port
        addrinfo* res;
        int status = getaddrinfo(hostname.c_str(), port.c_str(), &hints, &res );

        // if everything OK
        if ( status == 0 ) {

            // iterate over all IP addresses found
            addrinfo* p = res;
            for ( ; p != NULL; p = p->ai_next ) {

                // IPv4
                if ( p->ai_family == AF_INET ) {
                    sockaddr_in* ipv4 = (sockaddr_in*)p->ai_addr;
                    HostAddress a( ntohl(ipv4->sin_addr.s_addr) );
                    uniqueAddresses.insert(a);
                }

                // IPv6
                else if ( p->ai_family == AF_INET6 ) {
                    sockaddr_in6* ipv6 = (sockaddr_in6*)p->ai_addr;
//.........这里部分代码省略.........