/// <summary>
/// Converts a socket address to record
/// </summary>
/// <param name="address"></param>
/// <returns></returns>
internal static DnsServiceRecord FromSocketAddress(
ProxySocketAddress address)
{
var record = Parse(address.Host);
record._flags = address.Flags;
record._interfaceIndex = address.InterfaceIndex;
return(record);
}
/// <summary>
/// Start browsing specified item
/// </summary>
/// <param name="item"></param>
/// <param name="ct"></param>
/// <returns></returns>
public async Task BrowseBeginAsync(ProxySocketAddress item, CancellationToken ct)
{
if (!_connected)
{
throw new SocketException(SocketError.Closed);
}
var request = new BrowseRequest {
Item = item,
Handle = _id,
Type = _type
};
var buffer = new MemoryStream();
await request.EncodeAsync(buffer, _codec, ct);
await SendAsync(new Message(null, null, null,
new DataMessage(buffer.ToArray())), ct).ConfigureAwait(false);
}
/// <summary>
/// Parse a string into a socket address
/// </summary>
/// <param name="address"></param>
/// <param name="parsed"></param>
/// <returns></returns>
public static bool TryParse(string address, out SocketAddress parsed)
{
/**/ if (string.IsNullOrEmpty(address))
{
parsed = new AnySocketAddress();
}
else if (InetSocketAddress.TryParse(address, out var inet))
{
parsed = inet;
}
else if (ProxySocketAddress.TryParse(address, out var proxy))
{
parsed = proxy;
}
else
{
parsed = new AnySocketAddress();
return(false);
}
return(true);
}
/// <summary>
/// Connect to a target on first of bound proxies, or use ping based dynamic lookup
/// </summary>
/// <param name="address"></param>
/// <param name="ct"></param>
/// <returns></returns>
public override async Task ConnectAsync(SocketAddress address, CancellationToken ct)
{
if (address.Family == AddressFamily.Bound)
{
// Unwrap proxy and connect address. If not bound, use local address to bind to.
if (_bindList == null)
{
await BindAsync(((BoundSocketAddress)address).LocalAddress, ct);
}
address = ((BoundSocketAddress)address).RemoteAddress;
}
// Get the named host from the registry if it exists - there should only be one...
Host = null;
var hostList = await Provider.NameService.LookupAsync(
address.ToString(), NameRecordType.Host, ct).ConfigureAwait(false);
foreach (var host in hostList)
{
Host = host;
break;
}
// If there is no host in the registry, create a fake host record for this address
if (Host == null)
{
Host = new NameRecord(NameRecordType.Host, address.ToString());
}
else if (!Host.Name.Equals(address.ToString(), StringComparison.CurrentCultureIgnoreCase))
{
// Translate the address to host address
address = new ProxySocketAddress(Host.Name);
}
// Set bind list before connecting if it is not already set during Bind
bool autoBind = _bindList == null;
if (autoBind)
{
var bindList = new HashSet <INameRecord>();
foreach (var proxyRef in Host.References)
{
var results = await Provider.NameService.LookupAsync(
proxyRef, NameRecordType.Proxy, ct).ConfigureAwait(false);
bindList.AddRange(results);
}
_bindList = bindList.Any() ? bindList : null;
}
bool connected = false;
if (_bindList != null)
{
// Try to connect through each proxy in the bind list
foreach (var proxy in _bindList)
{
connected = await ConnectAsync(address, proxy, ct).ConfigureAwait(false);
if (connected)
{
break;
}
}
// If there was a bind list and we could not connect through it, throw
if (!connected && !autoBind)
{
throw new SocketException(SocketError.NoHost);
}
_bindList = null;
}
if (!connected)
{
await PingAsync(address, async (response, proxy, ct2) => {
if (connected)
{
return(Disposition.Done);
}
if (response.Error == (int)SocketError.Success)
{
try {
connected = await ConnectAsync(address, proxy, ct).ConfigureAwait(false);
}
catch (Exception) {
return(Disposition.Retry);
}
}
return(connected ? Disposition.Done : Disposition.Continue);
}, (ex) => {
if (!connected)
{
throw new SocketException(
"Could not link socket on proxy", ex, SocketError.NoHost);
}
}, ct).ConfigureAwait(false);
ct.ThrowIfCancellationRequested();
}
await Provider.NameService.AddOrUpdateAsync(Host, ct).ConfigureAwait(false);
}
internal HostEntryResolver(ProxySocketAddress host)
{
_host = host;
}
