GetLocalNetworkAddress.cs

string GetLocalNetworkAddress()
{
    // Find the IP address we're on, given a configured interface
    const string interface = "enx847beb51d7b4";

    ifaddrs* adresses { };
    getifaddrs(&adresses);

    ifaddrs* currentAddress = adresses;

    while (currentAddress->ifa_next != nullptr)
    {
        bool isIPv4 = currentAddress->ifa_addr->sa_family == AF_INET;
        bool isIPv6 = currentAddress->ifa_addr->sa_family == AF_INET6;

        if (currentAddress->ifa_name == interface && (isIPv4 | isIPv6))
        {
            break;
        }

        currentAddress = currentAddress->ifa_next;
    }

    string address;
    // Grab the address
    if (currentAddress->ifa_addr->sa_family == AF_INET)
    {
        auto addressPtr = &((sockaddr_in*)currentAddress->ifa_addr)->sin_addr;
        auto nameBuffer = make_unique<char[]>(INET_ADDRSTRLEN);
        inet_ntop(AF_INET, addressPtr, nameBuffer.get(), INET_ADDRSTRLEN);

        address = string(nameBuffer.get());
    }
    else if (currentAddress->ifa_addr->sa_family == AF_INET6)
    {
        auto addressPtr = &((sockaddr_in6*)currentAddress->ifa_addr)->sin6_addr;
        auto nameBuffer = make_unique<char[]>(INET6_ADDRSTRLEN);
        inet_ntop(AF_INET6, addressPtr, nameBuffer.get(), INET6_ADDRSTRLEN);

        address = string(nameBuffer.get());
    }

    freeifaddrs(adresses);

    return address;
}