/// <summary>
/// GetHostAddresses with timeout.
/// </summary>
/// <param name="host">Host name.</param>
/// <param name="timeoutMillis">Timeout in milliseconds</param>
public static IPAddress[] GetHostAddresses(string host, int timeoutMillis)
{
IAsyncResult result = Dns.BeginGetHostAddresses(host, null, null);
WaitHandle wait = result.AsyncWaitHandle;
if (wait.WaitOne(timeoutMillis))
{
// EndGetHostAddresses will automatically close AsyncWaitHandle.
IPAddress[] addresses = Dns.EndGetHostAddresses(result);
if (addresses.Length == 0)
{
throw new AerospikeException.Connection("Failed to find addresses for " + host);
}
return(addresses);
}
else
{
// Do not close AsyncWaitHandle because the disposed handle can be referenced after
// the exception is thrown. The handle will eventually get closed by the garbage collector.
// See: https://social.msdn.microsoft.com/Forums/en-US/313cf28c-2a6d-498e-8188-7a0639dbd552/tcpclientbeginconnect-issue?forum=netfxnetcom
throw new AerospikeException.Connection("Failed to resolve " + host);
}
}
public void BeginGetDate(Action <DateTime> getTime, Action failure)
{
index += 1;
if (hosts.Length <= index)
{
if (hosts.Length == index)
{
failure();
}
return;
}
try
{
var host = hosts[index];
var state = new State(null, null, getTime, failure);
var result = Dns.BeginGetHostAddresses(host, EndGetHostAddress, state);
RegisterWaitForTimeout(state, result);
}
catch (Exception)
{
// retry, recursion stops at the end of the hosts
BeginGetDate(getTime, failure);
}
}
public void BeginGetHostAddresses_HostNameOrAddress_UnspecifiedAddress()
{
// IPv4
try {
Dns.BeginGetHostAddresses(
"0.0.0.0",
new AsyncCallback(GetHostAddressesCallback),
null);
Assert.Fail("#A1");
} catch (ArgumentException ex) {
// IPv4 address 0.0.0.0 and IPv6 address ::0 are
// unspecified addresses that cannot be used as
// a target address
Assert.AreEqual(typeof(ArgumentException), ex.GetType(), "#A2");
Assert.IsNull(ex.InnerException, "#A3");
Assert.IsNotNull(ex.Message, "#A4");
Assert.AreEqual("hostNameOrAddress", ex.ParamName, "#A5");
}
// IPv6
try {
Dns.BeginGetHostAddresses(
"::0",
new AsyncCallback(GetHostAddressesCallback),
null);
Assert.Fail("#B1");
} catch (ArgumentException ex) {
// IPv4 address 0.0.0.0 and IPv6 address ::0 are
// unspecified addresses that cannot be used as
// a target address
Assert.AreEqual(typeof(ArgumentException), ex.GetType(), "#B2");
Assert.IsNull(ex.InnerException, "#B3");
Assert.IsNotNull(ex.Message, "#B4");
Assert.AreEqual("hostNameOrAddress", ex.ParamName, "#B5");
}
}
public void Connect(string hostname, int port)
{
if (ConnectTimeout > TimeSpan.Zero)
{
// https://forum.unity3d.com/threads/best-http-released.200006/page-37#post-3150972
System.Threading.ManualResetEvent mre = new System.Threading.ManualResetEvent(false);
IAsyncResult result = Dns.BeginGetHostAddresses(hostname, (res) => mre.Set(), null);
bool success = mre.WaitOne(ConnectTimeout);
if (success)
{
IPAddress[] addresses = Dns.EndGetHostAddresses(result);
Connect(addresses, port);
}
else
{
throw new TimeoutException("DNS resolve timed out!");
}
}
else
{
IPAddress[] addresses = Dns.GetHostAddresses(hostname);
Connect(addresses, port);
}
}
public static void LookupHostName(string hostName)
{
object unrelatedObject = "object";
Dns.BeginGetHostAddresses(hostName, OnHostNameResolved, unrelatedObject);
}
public IAsyncResult BeginGetHostEndpoints(AsyncCallback requestCallback, object state)
{
return(Dns.BeginGetHostAddresses(_hostname, requestCallback, state));
}
/// <summary>
/// Returns the Internet Protocol (IP) addresses for the specified host.
/// </summary>
/// <param name="hostNameOrAddress">The host name or IP address to resolve</param>
/// <returns>
/// An array of type <see cref="IPAddress"/> that holds the IP addresses for the host that
/// is specified by the <paramref name="hostNameOrAddress"/> parameter.
/// </returns>
/// <exception cref="ArgumentNullException"><paramref name="hostNameOrAddress"/> is <c>null</c>.</exception>
/// <exception cref="SocketException">An error is encountered when resolving <paramref name="hostNameOrAddress"/>.</exception>
public static IPAddress[] GetHostAddresses(string hostNameOrAddress)
{
// TODO Eliminate sync variant, and implement timeout
#if FEATURE_DNS_SYNC
return(Dns.GetHostAddresses(hostNameOrAddress));
#elif FEATURE_DNS_APM
var asyncResult = Dns.BeginGetHostAddresses(hostNameOrAddress, null, null);
if (!asyncResult.AsyncWaitHandle.WaitOne(Session.InfiniteTimeSpan))
{
throw new SshOperationTimeoutException("Timeout resolving host name.");
}
return(Dns.EndGetHostAddresses(asyncResult));
#elif FEATURE_DNS_TAP
return(Dns.GetHostAddressesAsync(hostNameOrAddress).GetAwaiter().GetResult());
#else
IPAddress address;
if (IPAddress.TryParse(hostNameOrAddress, out address))
{
return new [] { address }
}
;
#if FEATURE_DEVICEINFORMATION_APM
var resolveCompleted = new ManualResetEvent(false);
NameResolutionResult nameResolutionResult = null;
DeviceNetworkInformation.ResolveHostNameAsync(new DnsEndPoint(hostNameOrAddress, 0), result =>
{
nameResolutionResult = result;
resolveCompleted.Set();
}, null);
// wait until address is resolved
resolveCompleted.WaitOne();
if (nameResolutionResult.NetworkErrorCode == NetworkError.Success)
{
var addresses = new List <IPAddress>(nameResolutionResult.IPEndPoints.Select(p => p.Address).Distinct());
return(addresses.ToArray());
}
throw new SocketException((int)nameResolutionResult.NetworkErrorCode);
#elif FEATURE_DATAGRAMSOCKET
// TODO we may need to only return those IP addresses that are supported on the current system
// TODO http://wojciechkulik.pl/csharp/winrt-how-to-detect-supported-ip-versions
var endpointPairs = DatagramSocket.GetEndpointPairsAsync(new HostName(hostNameOrAddress), "").GetAwaiter().GetResult();
var addresses = new List <IPAddress>();
foreach (var endpointPair in endpointPairs)
{
if (endpointPair.RemoteHostName.Type == HostNameType.Ipv4 || endpointPair.RemoteHostName.Type == HostNameType.Ipv6)
{
addresses.Add(IPAddress.Parse(endpointPair.RemoteHostName.CanonicalName));
}
}
if (addresses.Count == 0)
{
throw new SocketException((int)System.Net.Sockets.SocketError.HostNotFound);
}
return(addresses.ToArray());
#else
throw new NotSupportedException("Resolving hostname to IP address is not implemented.");
#endif // FEATURE_DEVICEINFORMATION_APM
#endif
}
}
private static void LookupHostName()
{
object unrelatedObject = "hello";
Dns.BeginGetHostAddresses("oreilly.com", OnHostNameResolved, unrelatedObject);
}
public bool ReconnectToNewHost(string serverIp, int serverPort)
{
bool result;
if (!NetworkClient.active)
{
if (LogFilter.logError)
{
Debug.LogError("Reconnect - NetworkClient must be active");
}
result = false;
}
else if (this.m_Connection == null)
{
if (LogFilter.logError)
{
Debug.LogError("Reconnect - no old connection exists");
}
result = false;
}
else
{
if (LogFilter.logInfo)
{
Debug.Log(string.Concat(new object[]
{
"NetworkClient Reconnect ",
serverIp,
":",
serverPort
}));
}
ClientScene.HandleClientDisconnect(this.m_Connection);
ClientScene.ClearLocalPlayers();
this.m_Connection.Disconnect();
this.m_Connection = null;
this.m_ClientId = NetworkTransport.AddHost(this.m_HostTopology, this.m_HostPort);
this.m_ServerPort = serverPort;
if (Application.platform == RuntimePlatform.WebGLPlayer)
{
this.m_ServerIp = serverIp;
this.m_AsyncConnect = NetworkClient.ConnectState.Resolved;
}
else if (serverIp.Equals("127.0.0.1") || serverIp.Equals("localhost"))
{
this.m_ServerIp = "127.0.0.1";
this.m_AsyncConnect = NetworkClient.ConnectState.Resolved;
}
else
{
if (LogFilter.logDebug)
{
Debug.Log("Async DNS START:" + serverIp);
}
this.m_AsyncConnect = NetworkClient.ConnectState.Resolving;
Dns.BeginGetHostAddresses(serverIp, new AsyncCallback(NetworkClient.GetHostAddressesCallback), this);
}
result = true;
}
return(result);
}
public bool ReconnectToNewHost(string serverIp, int serverPort)
{
if (!NetworkClient.active)
{
if (LogFilter.logError)
{
Debug.LogError("Reconnect - NetworkClient must be active");
}
return(false);
}
if (m_Connection == null)
{
if (LogFilter.logError)
{
Debug.LogError("Reconnect - no old connection exists");
}
return(false);
}
if (LogFilter.logInfo)
{
Debug.Log("NetworkClient Reconnect " + serverIp + ":" + serverPort);
}
ClientScene.HandleClientDisconnect(m_Connection);
ClientScene.ClearLocalPlayers();
m_Connection.Disconnect();
m_Connection = null;
m_ClientId = NetworkTransport.AddHost(m_HostTopology, 0);
string hostnameOrIp = serverIp;
m_ServerPort = serverPort;
//TODO: relay reconnect
/*
* if (Match.NetworkMatch.matchSingleton != null)
* {
* hostnameOrIp = Match.NetworkMatch.matchSingleton.address;
* m_ServerPort = Match.NetworkMatch.matchSingleton.port;
* }*/
if (UnityEngine.Application.platform == RuntimePlatform.WebGLPlayer)
{
m_ServerIp = hostnameOrIp;
m_AsyncConnect = ConnectState.Resolved;
}
else if (serverIp.Equals("127.0.0.1") || serverIp.Equals("localhost"))
{
m_ServerIp = "127.0.0.1";
m_AsyncConnect = ConnectState.Resolved;
}
else
{
if (LogFilter.logDebug)
{
Debug.Log("Async DNS START:" + hostnameOrIp);
}
m_AsyncConnect = ConnectState.Resolving;
Dns.BeginGetHostAddresses(hostnameOrIp, new AsyncCallback(GetHostAddressesCallback), this);
}
return(true);
}
private void checkHostEntry(HostChanger.hostEntry entry)
{
Dns.BeginGetHostAddresses(entry.hostname, new AsyncCallback(ProcessHostEntries), entry);
}
private void toGetDNS()
{
_state = Connecting;
_connectTime = 0;
int index = ++_doIndex;
_currentInfo = _ipInfoDic.get(_host);
if (_currentInfo != null)
{
preConnectAfterAddress();
}
else
{
IPAddress address;
if (!IPAddress.TryParse(_host, out address))
{
Ctrl.debugLog("dns上");
Dns.BeginGetHostAddresses(_host, v =>
{
IPAddress[] addresses = null;
try
{
addresses = Dns.EndGetHostAddresses(v);
}
catch (Exception e)
{
Ctrl.printExceptionForIO(e);
}
ThreadControl.addMainFunc(() =>
{
if (index == _doIndex)
{
if (addresses != null)
{
foreach (IPAddress ipAddress in addresses)
{
Ctrl.print("dns看收到的上地址", ipAddress);
}
_currentInfo = registIPInfo(_host, addresses);
preConnectAfterAddress();
}
else
{
Ctrl.printForIO("解析dns失败");
}
}
else
{
Ctrl.print("dns获取完，已经到下个index");
}
});
}, null);
}
else
{
Ctrl.debugLog("dns下");
_currentInfo = registIPInfo(_host, new[] { address });
preConnectAfterAddress();
}
}
}
private byte TCPIP_DNS_Q()
{
var flags = cpu.Registers.B;
if (flags.GetBit(2) == 1 && dnsQueryInProgress)
{
return(ERR_QUERY_EXISTS);
}
if (flags.GetBit(0) == 1)
{
dnsQueryInProgress = false;
lastDnsError = 0;
return(ERR_OK);
}
if (NoNetworkAvailable())
{
return(ERR_NO_NETWORK);
}
if (!dnsServersAvailable)
{
return(ERR_NO_DNS);
}
var namePointer = cpu.Registers.HL;
var nameBytes = new List <byte>();
while (slots[namePointer] != 0)
{
nameBytes.Add(slots[namePointer++]);
}
var name = Encoding.ASCII.GetString(nameBytes.ToArray());
var wasIp = IPAddress.TryParse(name, out IPAddress parsedIp) &&
IsIPv4(parsedIp);
if (wasIp)
{
lastIpResolved = parsedIp.GetAddressBytes();
lastIpResolvedWasDirectIp = true;
cpu.Registers.B = 1;
cpu.Registers.L = lastIpResolved[0];
cpu.Registers.H = lastIpResolved[1];
cpu.Registers.E = lastIpResolved[2];
cpu.Registers.D = lastIpResolved[3];
return(ERR_OK);
}
if (flags.GetBit(1) == 1)
{
return(ERR_INV_IP);
}
dnsQueryInProgress = true;
Dns.BeginGetHostAddresses(name,
ar =>
{
dnsQueryInProgress = false;
IPAddress[] addresses;
try
{
addresses = Dns.EndGetHostAddresses(ar);
}
catch (Exception ex)
{
if (ex is SocketException sockEx)
{
lastDnsError = UnapiDnsErrorFromSocketError(sockEx.SocketErrorCode);
}
else
{
lastDnsError = 0;
}
return;
}
var address = addresses.FirstOrDefault(IsIPv4);
lastIpResolved = address?.GetAddressBytes();
lastIpResolvedWasDirectIp = false;
lastDnsError = null;
}
, null);
cpu.Registers.B = 0;
return(ERR_OK);
}
private void StartDnsResolve(DnsResolveStatus rs)
{
Dns.BeginGetHostAddresses(rs.Hostname, new AsyncCallback(DnsCallback), rs);
}
public MumbleClient(string hostName, int port, AudioPlayerCreatorMethod createMumbleAudioPlayerMethod,
AudioPlayerRemoverMethod removeMumbleAudioPlayerMethod, AnyUserStateChangedMethod anyChangeMethod = null,
bool async = false, SpeakerCreationMode speakerCreationMode = SpeakerCreationMode.ALL,
DebugValues debugVals = null, int maxPositionalDataLength = 0)
{
_hostName = hostName;
_port = port;
_audioPlayerCreator = createMumbleAudioPlayerMethod;
_audioPlayerDestroyer = removeMumbleAudioPlayerMethod;
_speakerCreationMode = speakerCreationMode;
_anyUserStateChange = anyChangeMethod;
_maxPositionalDataLength = maxPositionalDataLength;
//Check if localhost
if (_hostName.ToLower() == "localhost")
{
_hostName = "127.0.0.1";
}
switch (AudioSettings.outputSampleRate)
{
case 8000:
case 12000:
case 16000:
case 24000:
case 48000:
_outputSampleRate = AudioSettings.outputSampleRate;
break;
default:
Debug.LogError("Incorrect sample rate of:" + AudioSettings.outputSampleRate + ". It should be 48000 please set this in Edit->Audio->SystemSampleRate");
_outputSampleRate = 48000;
break;
}
Debug.Log("Using output sample rate: " + _outputSampleRate);
switch (AudioSettings.speakerMode)
{
case AudioSpeakerMode.Mono:
// TODO sometimes, even though the speaker mode is mono,
// on audiofilterread wants two channels
_outputChannelCount = 1;
break;
case AudioSpeakerMode.Stereo:
_outputChannelCount = 2;
break;
default:
Debug.LogError("Unsupported speaker mode " + AudioSettings.speakerMode + " please set this in Edit->Audio->DefaultSpeakerMode to either Mono or Stereo");
_outputChannelCount = 2;
break;
}
Debug.Log("Using output channel count of: " + _outputChannelCount);
if (debugVals == null)
{
debugVals = new DebugValues();
}
_debugValues = debugVals;
if (async)
{
Dns.BeginGetHostAddresses(hostName, OnHostRecv, null);
}
else
{
IPAddress[] addresses = Dns.GetHostAddresses(hostName);
Init(addresses);
}
}
public Task <DateTime> GetDateAsync()
{
index++;
if (hosts.Length <= index)
{
throw new InvalidOperationException(
"After trying out all the hosts, was unable to find anyone that could tell us what the time is");
}
var host = hosts[index];
return(Task.Factory.FromAsync <IPAddress[]>((callback, state) => Dns.BeginGetHostAddresses(host, callback, state),
Dns.EndGetHostAddresses, host)
.ContinueWith(hostTask =>
{
if (hostTask.IsFaulted)
{
log.DebugException("Could not get time from: " + host, hostTask.Exception);
return GetDateAsync();
}
var endPoint = new IPEndPoint(hostTask.Result[0], 123);
var socket = new UdpClient();
socket.Connect(endPoint);
socket.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 500);
socket.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 500);
var sntpData = new byte[SntpDataLength];
sntpData[0] = 0x1B; // version = 4 & mode = 3 (client)
return Task.Factory.FromAsync <int>(
(callback, state) => socket.BeginSend(sntpData, sntpData.Length, callback, state),
socket.EndSend, null)
.ContinueWith(sendTask =>
{
if (sendTask.IsFaulted)
{
try
{
socket.Close();
}
catch (Exception)
{
}
log.DebugException("Could not send time request to : " + host, sendTask.Exception);
return GetDateAsync();
}
return Task.Factory.FromAsync <byte[]>(socket.BeginReceive, (ar) => socket.EndReceive(ar, ref endPoint), null)
.ContinueWith(receiveTask =>
{
if (receiveTask.IsFaulted)
{
try
{
socket.Close();
}
catch (Exception)
{
}
log.DebugException("Could not get time response from: " + host, receiveTask.Exception);
return GetDateAsync();
}
var result = receiveTask.Result;
if (IsResponseValid(result) == false)
{
log.Debug("Did not get valid time information from " + host);
return GetDateAsync();
}
var transmitTimestamp = GetTransmitTimestamp(result);
return new CompletedTask <DateTime>(transmitTimestamp);
}).Unwrap();
}).Unwrap();
}).Unwrap());
}
IEnumerator _Send()
{
++_sent;
var bytes = Crypto.RandomBytes(_size);
// resolve
if (_hostEntry == null)
{
var dns = Dns.BeginGetHostAddresses(_host, null, null);
while (!dns.IsCompleted)
{
yield return(null);
}
try {
var ips = Dns.EndGetHostAddresses(dns);
if (EB.Net.TcpClientUtil.OSSupportsIPv4())
{
foreach (var ip in ips)
{
if (ip.AddressFamily == AddressFamily.InterNetwork)
{
_hostEntry = ip;
break;
}
}
}
if (_hostEntry == null && EB.Net.TcpClientUtil.OSSupportsIPv6())
{
foreach (var ip in ips)
{
if (ip.AddressFamily == AddressFamily.InterNetworkV6)
{
_hostEntry = ip;
break;
}
}
}
}
catch {
}
}
if (_hostEntry == null)
{
if (OnError != null)
{
OnError(Localizer.GetString("ID_SPARX_ERROR_FAILED_DNS"));
yield break;
}
}
// check address family
if (_client.Client.AddressFamily != _hostEntry.AddressFamily)
{
int bindPort = ((IPEndPoint)_client.Client.LocalEndPoint).Port;
_client.Close();
_client = null;
// find a bind port
while (_client == null)
{
try
{
_client = new UdpClient(bindPort, _hostEntry.AddressFamily);
}
catch
{
bindPort++;
}
}
EB.Debug.Log("QosProbe Re-Bound to " + bindPort + " for " + _host);
}
// get the ip
var ep = new IPEndPoint(_hostEntry, _port);
try {
_client.Send(bytes, bytes.Length, ep);
}
catch {
OnError(Localizer.GetString("ID_SPARX_ERROR_UNKNOWN"));
yield break;
}
var ping = 0.0f;
var start = System.DateTime.Now;
var async = _client.BeginReceive(delegate(System.IAsyncResult ar){
ping = (float)(System.DateTime.Now - start).TotalMilliseconds;
//Debug.Log("receive complete " + ping + " " + _host);
}, null);
var timeout = Time.realtimeSinceStartup + _timeout / 1000.0f;
while (!async.IsCompleted)
{
if (Time.realtimeSinceStartup >= timeout)
{
// we timed out;
EB.Debug.LogWarning("QosProbe timed out to " + _host);
yield return(new WaitForFixedUpdate());
SendProbe();
yield break;
}
yield return(null);
}
_received++;
_data = _client.EndReceive(async, ref ep);
_sum += ping;
_max = Mathf.Max(_max, ping);
_min = Mathf.Min(_min, ping);
SendProbe();
}
static void Main(string[] args)
{
Dns.BeginGetHostAddresses("www.baidu.com", result => { IPAddress[] address = Dns.EndGetHostAddresses(result); Console.WriteLine(address[0]); }, null);
Console.ReadLine();
}
//si basa su IAsyncResult
//1. il chiamante invoca il metodo Begin passando una callback
//2. l'operazione avviene in un thread separato
//3. al termine dell'operazione viene richiamata la callback
//4. il chiamante esegue il metodo End che restituisce il risultato
private static void LookupHostName1()
{
Dns.BeginGetHostAddresses("www.elfo.net", OnHostNameResolved, null);
}
/// <summary>
/// Construct a new client where the address or host name of
/// the server is known.
/// </summary>
/// <param name="hostNameOrAddress">The host name or address of the server</param>
/// <param name="port">The port of the server</param>
public TcpReceiverClient(string hostNameOrAddress, int port)
: this(port)
{
addressesSet = new AutoResetEvent(false);
Dns.BeginGetHostAddresses(hostNameOrAddress, GetHostAddressesCallback, null);
}
public override void Open(NpgsqlConnector context, Int32 timeout)
{
try
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "Open");
IAsyncResult result;
// Keep track of time remaining; Even though there may be multiple timeout-able calls,
// this allows us to still respect the caller's timeout expectation.
DateTime attemptStart;
attemptStart = DateTime.Now;
result = Dns.BeginGetHostAddresses(context.Host, null, null);
if (!result.AsyncWaitHandle.WaitOne(timeout, true))
{
// Timeout was used up attempting the Dns lookup
throw new TimeoutException("Exception_DnsLookupTimeout");
}
timeout -= Convert.ToInt32((DateTime.Now - attemptStart).TotalMilliseconds);
IPAddress[] ips = Dns.EndGetHostAddresses(result);
Socket socket = null;
Exception lastSocketException = null;
// try every ip address of the given hostname, use the first reachable one
// make sure not to exceed the caller's timeout expectation by splitting the
// time we have left between all the remaining ip's in the list.
for (int i = 0; i < ips.Length; i++)
{
NpgsqlEventLog.LogMsg("Log_ConnectingTo", LogLevel.Debug, ips[i]);
IPEndPoint ep = new IPEndPoint(ips[i], context.Port);
socket = new Socket(ep.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
attemptStart = DateTime.Now;
try
{
result = socket.BeginConnect(ep, null, null);
if (!result.AsyncWaitHandle.WaitOne(timeout / (ips.Length - i), true))
{
throw new TimeoutException("Exception_ConnectionTimeout");
}
socket.EndConnect(result);
// connect was successful, leave the loop
break;
}
catch (Exception e)
{
NpgsqlEventLog.LogMsg("Log_FailedConnection", LogLevel.Normal, ips[i]);
timeout -= Convert.ToInt32((DateTime.Now - attemptStart).TotalMilliseconds);
lastSocketException = e;
socket.Close();
socket = null;
}
}
if (socket == null)
{
throw lastSocketException;
}
NpgsqlNetworkStream baseStream = new NpgsqlNetworkStream(socket, true);
Stream sslStream = null;
// If the PostgreSQL server has SSL connectors enabled Open SslClientStream if (response == 'S') {
if (context.SSL || (context.SslMode == SslMode.Require) || (context.SslMode == SslMode.Prefer))
{
baseStream
.WriteInt32(8)
.WriteInt32(80877103);
throw new InvalidOperationException("Exception_Ssl_RequestError");
}
context.Socket = socket;
context.BaseStream = baseStream;
context.Stream = new BufferedStream(sslStream == null ? baseStream : sslStream, 8192);
NpgsqlEventLog.LogMsg("Log_ConnectedTo", LogLevel.Normal, context.Host, context.Port);
ChangeState(context, NpgsqlConnectedState.Instance);
}
catch (Exception e)
{
throw new NpgsqlException("Exception_FailedConnection", e);
}
}
public void DnsBeginGetHostAddresses_BadName_Throws()
{
IAsyncResult asyncObject = Dns.BeginGetHostAddresses("BadName", null, null);
Assert.ThrowsAny <SocketException>(() => Dns.EndGetHostAddresses(asyncObject));
}
// Network Thread
private void UpdateStun()
{
bool didPoll = stunRequestedCount > 0;
double now = NetTime.Now;
if (now > stunExpireTime)
{
stunResult = null;
stunInProgress = false;
if (didPoll)
{
if (stunHostnames.Count == 0)
{
return;
}
// Restart STUN
stunInProgress = true;
stunExpireTime = now + Configuration.AssumedNATMappingTime; // <- When do we give up querying?
if (pendingStun == null)
{
pendingStun = new StunInfo[stunHostnames.Count];
}
else
{
Array.Clear(pendingStun, 0, pendingStun.Length);
}
var rng = StunRNG;
for (int i = 0; i < pendingStun.Length; i++)
{
// NOTE: Retransmit values are specified in RFC 5389
pendingStun[i].remainingTransmits = 7;
pendingStun[i].nextRetransmitDelay = 0.5;
pendingStun[i].nextTransmitTime = double.NegativeInfinity;
pendingStun[i].transactionID0 = rng.NextUInt();
pendingStun[i].transactionID1 = rng.NextUInt();
pendingStun[i].transactionID2 = rng.NextUInt();
}
stunStartedCount = 1; // <- Cause the first request to start
}
}
if (stunInProgress)
{
int liveStunCount = 0;
for (int i = 0; i < stunStartedCount; i++)
{
if (pendingStun[i].dead)
{
goto finish;
}
// STEP 1: Start a DNS query
if (pendingStun[i].endpoint == null && pendingStun[i].pendingDnsRequest == null)
{
try
{
pendingStun[i].pendingDnsRequest = Dns.BeginGetHostAddresses(stunHostnames[i], null, null);
}
catch
{
LogDebug("STUN BeginGetHostAddresses failed for \"" + stunHostnames[i] + "\"");
pendingStun[i].dead = true;
goto finish;
}
}
// STEP 2: Finish DNS query
bool firstTransmit = false;
if (pendingStun[i].pendingDnsRequest != null && pendingStun[i].pendingDnsRequest.IsCompleted)
{
try
{
var addresses = Dns.EndGetHostAddresses(pendingStun[i].pendingDnsRequest);
IPAddress bestAddress = null;
foreach (var address in addresses)
{
if (address.AddressFamily != AddressFamily.InterNetwork && address.AddressFamily != AddressFamily.InterNetworkV6)
{
continue;
}
// TODO: How to preference IPv4 vs IPv6 (for now, always prefer IPv4)
if (bestAddress == null || bestAddress.AddressFamily == AddressFamily.InterNetworkV6 && address.AddressFamily == AddressFamily.InterNetwork)
{
bestAddress = address;
}
}
if (bestAddress == null)
{
LogDebug("STUN No address result for \"" + stunHostnames[i] + "\"");
pendingStun[i].dead = true;
goto finish;
}
pendingStun[i].endpoint = new IPEndPoint(bestAddress, stunPorts[i]);
}
catch
{
LogDebug("STUN EndGetHostAddresses failed for \"" + stunHostnames[i] + "\"");
pendingStun[i].dead = true;
goto finish;
}
finally
{
Debug.Assert(pendingStun[i].endpoint != null || pendingStun[i].dead);
pendingStun[i].pendingDnsRequest = null;
}
Debug.Assert(pendingStun[i].endpoint != null);
firstTransmit = true;
}
// STEP 3: Generate and transmit STUN requests
if (pendingStun[i].endpoint != null)
{
if (now >= pendingStun[i].nextTransmitTime)
{
// Use retransmit as a trigger to fail-over to the next STUN
if (!firstTransmit && i == stunStartedCount - 1 && stunStartedCount < pendingStun.Length)
{
stunStartedCount++;
}
if (pendingStun[i].remainingTransmits > 0)
{
pendingStun[i].remainingTransmits--;
pendingStun[i].nextTransmitTime = now + pendingStun[i].nextRetransmitDelay;
pendingStun[i].nextRetransmitDelay *= 2.0;
LogVerbose("STUN Sending packet to \"" + stunHostnames[i] + "\" at " + pendingStun[i].endpoint + " (remain="
+ pendingStun[i].remainingTransmits + "; delay=" + pendingStun[i].nextRetransmitDelay + ")");
if (!SendStunPacket(pendingStun[i].endpoint, pendingStun[i].transactionID0, pendingStun[i].transactionID1, pendingStun[i].transactionID2))
{
LogDebug("STUN refused by ICMP remote \"" + stunHostnames[i] + "\"");
pendingStun[i].dead = true;
goto finish;
}
}
}
}
liveStunCount++;
finish:
// If all current STUNs have failed, start a fresh one:
if (liveStunCount == 0 && i == stunStartedCount - 1 && stunStartedCount < pendingStun.Length)
{
stunStartedCount++;
}
}
if (liveStunCount == 0 && stunStartedCount == pendingStun.Length)
{
// We failed to get a response (NOTE: expiry time gets set when we _start_)
stunInProgress = false;
}
}
if (!stunInProgress)
{
PostStunResults();
}
}
private void ConnectImpl(string host, int port, int timeout, Action <NetHandler, Exception> callback)
{
if (!running)
{
throw new ObjectDisposedException(ToString());
}
Stopwatch clock = new Stopwatch();
clock.Start();
Dns.BeginGetHostAddresses(host, ar =>
{
clock.Stop();
timeout -= (int)clock.ElapsedMilliseconds;
try
{
IPAddress[] iplist = Dns.EndGetHostAddresses(ar);
if (timeout > 0)
{
AddressFamily family = AddressFamily.InterNetwork;
for (int i = 0; i < iplist.Length; ++i)
{
if (iplist[i].AddressFamily == AddressFamily.InterNetworkV6)
{
family = AddressFamily.InterNetworkV6;
break;
}
}
NetHandlerImpl socket = new NetHandlerImpl(family, this);
Timer timer = new Timer(state =>
{
socket.Socket.Close();
}, null, Timeout.Infinite, Timeout.Infinite);
socket.Socket.BeginConnect(iplist, port, result =>
{
try
{
timer.Dispose();
}
catch
{
}
Exception exception = null;
try
{
socket.Socket.EndConnect(result);
socket.Socket.Blocking = false;
socket.OnConnected();
}
catch (ObjectDisposedException)
{
exception = new SocketException((int)SocketError.TimedOut);
}
catch (Exception e)
{
exception = e;
socket.Socket.Close();
}
callback(exception == null ? socket : null, exception);
}, null);
timer.Change(timeout, Timeout.Infinite);
}
else
{
callback(null, new SocketException((int)SocketError.TimedOut));
}
}
catch (Exception e)
{
callback(null, e);
}
}, null);
}
public void Dns_BeginGetHostAddresses_CallSocketInit_Ok()
{
NameResolutionPal.FakesReset();
Assert.ThrowsAny <Exception>(() => Dns.BeginGetHostAddresses(null, null, null));
Assert.NotEqual(0, NameResolutionPal.FakesEnsureSocketsAreInitializedCallCount);
}
public override void Open(NpgsqlConnector context, Int32 timeout)
{
try
{
NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "Open");
IAsyncResult result;
// Keep track of time remaining; Even though there may be multiple timeout-able calls,
// this allows us to still respect the caller's timeout expectation.
DateTime attemptStart;
attemptStart = DateTime.Now;
result = Dns.BeginGetHostAddresses(context.Host, null, null);
if (!result.AsyncWaitHandle.WaitOne(timeout, true))
{
// Timeout was used up attempting the Dns lookup
throw new TimeoutException(resman.GetString("Exception_DnsLookupTimeout"));
}
timeout -= Convert.ToInt32((DateTime.Now - attemptStart).TotalMilliseconds);
IPAddress[] ips = Dns.EndGetHostAddresses(result);
Socket socket = null;
Exception lastSocketException = null;
// try every ip address of the given hostname, use the first reachable one
// make sure not to exceed the caller's timeout expectation by splitting the
// time we have left between all the remaining ip's in the list.
for (int i = 0; i < ips.Length; i++)
{
NpgsqlEventLog.LogMsg(resman, "Log_ConnectingTo", LogLevel.Debug, ips[i]);
IPEndPoint ep = new IPEndPoint(ips[i], context.Port);
socket = new Socket(ep.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
attemptStart = DateTime.Now;
try
{
result = socket.BeginConnect(ep, null, null);
if (!result.AsyncWaitHandle.WaitOne(timeout / (ips.Length - i), true))
{
throw new TimeoutException(resman.GetString("Exception_ConnectionTimeout"));
}
socket.EndConnect(result);
// connect was successful, leave the loop
break;
}
catch (Exception e)
{
NpgsqlEventLog.LogMsg(resman, "Log_FailedConnection", LogLevel.Normal, ips[i]);
timeout -= Convert.ToInt32((DateTime.Now - attemptStart).TotalMilliseconds);
lastSocketException = e;
socket.Close();
socket = null;
}
}
if (socket == null)
{
throw lastSocketException;
}
NpgsqlNetworkStream baseStream = new NpgsqlNetworkStream(socket, true);
Stream sslStream = null;
// If the PostgreSQL server has SSL connectors enabled Open SslClientStream if (response == 'S') {
if (context.SSL || (context.SslMode == SslMode.Require) || (context.SslMode == SslMode.Prefer))
{
baseStream
.WriteInt32(8)
.WriteInt32(80877103);
// Receive response
Char response = (Char)baseStream.ReadByte();
if (response == 'S')
{
//create empty collection
X509CertificateCollection clientCertificates = new X509CertificateCollection();
//trigger the callback to fetch some certificates
context.DefaultProvideClientCertificatesCallback(clientCertificates);
//if (context.UseMonoSsl)
if (!NpgsqlConnector.UseSslStream)
{
SslClientStream sslStreamPriv;
sslStreamPriv = new SslClientStream(
baseStream,
context.Host,
true,
SecurityProtocolType.Default,
clientCertificates);
sslStreamPriv.ClientCertSelectionDelegate =
new CertificateSelectionCallback(context.DefaultCertificateSelectionCallback);
sslStreamPriv.ServerCertValidationDelegate =
new CertificateValidationCallback(context.DefaultCertificateValidationCallback);
sslStreamPriv.PrivateKeyCertSelectionDelegate =
new PrivateKeySelectionCallback(context.DefaultPrivateKeySelectionCallback);
sslStream = sslStreamPriv;
}
else
{
SslStream sslStreamPriv;
sslStreamPriv = new SslStream(baseStream, true, context.DefaultValidateRemoteCertificateCallback);
sslStreamPriv.AuthenticateAsClient(context.Host, clientCertificates, System.Security.Authentication.SslProtocols.Default, false);
sslStream = sslStreamPriv;
}
}
else if (context.SslMode == SslMode.Require)
{
throw new InvalidOperationException(resman.GetString("Exception_Ssl_RequestError"));
}
}
context.Socket = socket;
context.BaseStream = baseStream;
context.Stream = new BufferedStream(sslStream == null ? baseStream : sslStream, 8192);
NpgsqlEventLog.LogMsg(resman, "Log_ConnectedTo", LogLevel.Normal, context.Host, context.Port);
ChangeState(context, NpgsqlConnectedState.Instance);
}
catch (Exception e)
{
throw new NpgsqlException(string.Format(resman.GetString("Exception_FailedConnection"), context.Host), e);
}
}
public static IPAddress QueryActiveIPAddress(int timeout = 300, string hostNameOrAddress = "www.baidu.com")
{
if (string.IsNullOrEmpty(hostNameOrAddress))
{
return(null);
}
using (AutoResetEvent events = new AutoResetEvent(false))
{
IPAddress address = null;
Stopwatch stopwatch = new Stopwatch();
bool istimedout = false;
try
{
Dns.BeginGetHostAddresses(hostNameOrAddress, (ar) =>
{
if (istimedout)
{
return;
}
try
{
IPAddress[] addresses = Dns.EndGetHostAddresses(ar);
if (addresses != null && addresses.Length > 0)
{
foreach (IPAddress i in addresses)
{
if (i.AddressFamily == AddressFamily.InterNetwork)
{
address = i;
break;
}
}
events.Set();
}
}
catch (Exception)
{
}
}, null);
}
catch (Exception)
{
return(null);
}
do
{
stopwatch.Start();
if (!events.WaitOne(timeout))
{
istimedout = true;
return(null);
}
else if (address == null)
{
return(null);
}
stopwatch.Stop();
} while (false);
timeout -= Convert.ToInt32(stopwatch.ElapsedMilliseconds);
if (timeout <= 0)
{
return(null);
}
using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
try
{
socket.NoDelay = true;
socket.BeginConnect(new IPEndPoint(address, 443), (ar) =>
{
if (istimedout)
{
return;
}
try
{
socket.EndConnect(ar);
EndPoint localEP = socket.LocalEndPoint;
if (localEP != null)
{
IPEndPoint ipep = (IPEndPoint)localEP;
address = ipep.Address;
events.Set();
}
}
catch (Exception)
{
address = null;
}
}, null);
}
catch (Exception)
{
return(null);
}
do
{
if (!events.WaitOne(timeout))
{
istimedout = true;
return(null);
}
} while (false);
MalockSocket.Close(socket);
}
return(address);
}
}
