static async Task UpdateHostnameAsync()
{
try
{
_remote = await ResolveRemoteAddressAsync();
}
catch (Exception ex)
{
E($"resolve remote hostname failed: {ex}");
}
while (!_cts.IsCancellationRequested)
{
try
{
using (var req = new HttpRequestMessage(HttpMethod.Get, string.Format(HOSTNAME_UPDATE_URL, _hostname, _remote)))
{
req.Headers.TryAddWithoutValidation("User-Agent", USER_AGENT);
req.Headers.TryAddWithoutValidation("Authorization", $"Basic {GetAuthorizationHeader(_username, _password)}");
using (var res = await _client.SendAsync(req))
{
var result = await res.Content.ReadAsStringAsync();
switch (result.Replace("\r\n", "\n").Replace("\n", ""))
{
case "nohost": E("Hostname supplied does not exist under specified account."); break;
case "badauth": E("Invalid username password combination."); break;
case "badagent": E("Client disabled. Client should exit and not perform any more updates without user intervention."); break;
case "!donator":
case "donator": E("An update request was sent including a feature that is not available to that particular user such as offline options."); break;
case "abuse": E("Username is blocked due to abuse."); break;
case "911":
{
M("A fatal error on our side such as a database outage. Retry the update no sooner than 30 minutes.");
_flags |= LoopFlags.Outage;
}
break;
default:
{
if (result.StartsWith("good") || result.StartsWith("nochg"))
{
var op = result.Split(' ')[0];
if (op == "good")
{
M("[Success] DNS hostname update successful.");
_flags = LoopFlags.None;
}
if (op == "nochg")
{
M("[Success] IP address is current, no update performed.");
_flags = LoopFlags.None;
}
}
else
{
M("[Warning] Unknown response: " + result + ".");
_flags = LoopFlags.Unknown;
}
}
break;
}
}
}
if ((_flags & LoopFlags.Outage) != 0)
{
var ts = TimeSpan.FromMinutes(30d);
_expirationTime = DateTime.UtcNow.Add(ts);
await Task.Delay(ts);
}
else if ((_flags & LoopFlags.Unknown) != 0)
{
await Task.Delay(TimeSpan.FromSeconds(5d));
}
else
{
_expirationTime = DateTime.UtcNow.Add(HOSTNAME_UPDATE_INTERVAL);
await Task.Delay(HOSTNAME_UPDATE_INTERVAL);
}
}
catch (Exception ex)
{
Console.WriteLine("Update hostname failed: " + ex.Message);
}
}
}
public Block(BinaryReader reader)
{
DecodingCoeff = reader.ReadByte();
LoopFlags = (LoopFlags)reader.ReadByte();
Data = reader.ReadBytes(14);
}