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using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using Microsoft.Extensions.Logging;
namespace SocketHttpListener.Net
{
internal sealed class HttpEndPointManager
{
private static Dictionary<IPAddress, Dictionary<int, HttpEndPointListener>> s_ipEndPoints = new Dictionary<IPAddress, Dictionary<int, HttpEndPointListener>>();
private HttpEndPointManager()
{
}
public static void AddListener(ILogger logger, HttpListener listener)
{
var added = new List<string>();
try
{
lock ((s_ipEndPoints as ICollection).SyncRoot)
{
foreach (string prefix in listener.Prefixes)
{
AddPrefixInternal(logger, prefix, listener);
added.Add(prefix);
}
}
}
catch
{
foreach (string prefix in added)
{
RemovePrefix(logger, prefix, listener);
}
throw;
}
}
public static void AddPrefix(ILogger logger, string prefix, HttpListener listener)
{
lock ((s_ipEndPoints as ICollection).SyncRoot)
{
AddPrefixInternal(logger, prefix, listener);
}
}
private static void AddPrefixInternal(ILogger logger, string p, HttpListener listener)
{
int start = p.IndexOf(':') + 3;
int colon = p.IndexOf(':', start);
if (colon != -1)
{
// root can't be -1 here, since we've already checked for ending '/' in ListenerPrefix.
int root = p.IndexOf('/', colon, p.Length - colon);
string portString = p.Substring(colon + 1, root - colon - 1);
if (!int.TryParse(portString, out var port) || port <= 0 || port >= 65536)
{
throw new HttpListenerException((int)HttpStatusCode.BadRequest, "net_invalid_port");
}
}
var lp = new ListenerPrefix(p);
if (lp.Host != "*" && lp.Host != "+" && Uri.CheckHostName(lp.Host) == UriHostNameType.Unknown)
throw new HttpListenerException((int)HttpStatusCode.BadRequest, "net_listener_host");
if (lp.Path.IndexOf('%') != -1)
throw new HttpListenerException((int)HttpStatusCode.BadRequest, "net_invalid_path");
if (lp.Path.IndexOf("//", StringComparison.Ordinal) != -1)
throw new HttpListenerException((int)HttpStatusCode.BadRequest, "net_invalid_path");
// listens on all the interfaces if host name cannot be parsed by IPAddress.
var epl = GetEPListener(logger, lp.Host, lp.Port, listener, lp.Secure);
epl.AddPrefix(lp, listener);
}
private static IPAddress GetIpAnyAddress(HttpListener listener)
{
return listener.EnableDualMode ? IPAddress.IPv6Any : IPAddress.Any;
}
private static HttpEndPointListener GetEPListener(ILogger logger, string host, int port, HttpListener listener, bool secure)
{
IPAddress addr;
if (host == "*" || host == "+")
{
addr = GetIpAnyAddress(listener);
}
else
{
const int NotSupportedErrorCode = 50;
try
{
addr = Dns.GetHostAddresses(host)[0];
}
catch
{
// Throw same error code as windows, request is not supported.
throw new HttpListenerException(NotSupportedErrorCode, "net_listener_not_supported");
}
if (IPAddress.Any.Equals(addr))
{
// Don't support listening to 0.0.0.0, match windows behavior.
throw new HttpListenerException(NotSupportedErrorCode, "net_listener_not_supported");
}
}
Dictionary<int, HttpEndPointListener> p = null;
if (s_ipEndPoints.ContainsKey(addr))
{
p = s_ipEndPoints[addr];
}
else
{
p = new Dictionary<int, HttpEndPointListener>();
s_ipEndPoints[addr] = p;
}
HttpEndPointListener epl = null;
if (p.ContainsKey(port))
{
epl = p[port];
}
else
{
try
{
epl = new HttpEndPointListener(listener, addr, port, secure, listener.Certificate, logger, listener.CryptoProvider, listener.SocketFactory, listener.StreamHelper, listener.TextEncoding, listener.FileSystem, listener.EnvironmentInfo);
}
catch (SocketException ex)
{
throw new HttpListenerException(ex.ErrorCode, ex.Message);
}
p[port] = epl;
}
return epl;
}
public static void RemoveEndPoint(HttpEndPointListener epl, IPEndPoint ep)
{
lock ((s_ipEndPoints as ICollection).SyncRoot)
{
Dictionary<int, HttpEndPointListener> p = null;
p = s_ipEndPoints[ep.Address];
p.Remove(ep.Port);
if (p.Count == 0)
{
s_ipEndPoints.Remove(ep.Address);
}
epl.Close();
}
}
public static void RemoveListener(ILogger logger, HttpListener listener)
{
lock ((s_ipEndPoints as ICollection).SyncRoot)
{
foreach (string prefix in listener.Prefixes)
{
RemovePrefixInternal(logger, prefix, listener);
}
}
}
public static void RemovePrefix(ILogger logger, string prefix, HttpListener listener)
{
lock ((s_ipEndPoints as ICollection).SyncRoot)
{
RemovePrefixInternal(logger, prefix, listener);
}
}
private static void RemovePrefixInternal(ILogger logger, string prefix, HttpListener listener)
{
var lp = new ListenerPrefix(prefix);
if (lp.Path.IndexOf('%') != -1)
return;
if (lp.Path.IndexOf("//", StringComparison.Ordinal) != -1)
return;
var epl = GetEPListener(logger, lp.Host, lp.Port, listener, lp.Secure);
epl.RemovePrefix(lp, listener);
}
}
}
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