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HttpTransit.cs
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HttpTransit.cs
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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using static WebOne.Program;
namespace WebOne
{
/// <summary>
/// Transit transfer of content with applying some edits (HTTP)
/// </summary>
class HttpTransit
{
HttpRequest ClientRequest;
HttpResponse ClientResponse;
LogWriter Log;
byte[] UTF8BOM = Encoding.UTF8.GetPreamble();
const string NoContentType = "webone/unknown-content-type";
Dictionary<string, string> Variables = new();
Uri RequestURL = new("about:blank");
static string LastURL = "http://999.999.999.999/CON";
static HttpStatusCode LastCode = HttpStatusCode.OK;
static string LastContentType = "not-a-carousel";
List<EditSet> EditSets = new();
bool Stop = false;
HttpOperation operation;
int ResponseCode = 502;
string ResponseBody = ":(";
Stream TransitStream = null;
string ContentType = NoContentType;
Encoding SourceContentEncoding = Encoding.Default;
Encoding OutputContentEncoding = ConfigFile.OutputEncoding;
bool EnableTransliteration = false;
string DumpFile = null;
/// <summary>
/// Initialize the Web 2.0 to Web 1.0 HTTP traffic transit operator.
/// </summary>
/// <param name="ClientRequest">Request from HTTP Listener</param>
/// <param name="ClientResponse">Response for HTTP Listener</param>
public HttpTransit(HttpRequest ClientRequest, HttpResponse ClientResponse, LogWriter Log)
{
this.ClientRequest = ClientRequest;
this.ClientResponse = ClientResponse;
this.Log = Log;
}
/// <summary>
/// Convert a Web 2.0 content to Web 1.0-like.
/// </summary>
public void ProcessTransit()
{
#if DEBUG
Log.WriteLine(" Begin process.");
#endif
try
{
//check IP black list
if (CheckString(ClientRequest.RemoteEndPoint.ToString(), ConfigFile.IpBanList))
{
Log.WriteLine(" Banned client.");
ClientResponse.Close();
return;
}
//check IP white list
if (ConfigFile.IpWhiteList.Count > 0)
if (!CheckString(ClientRequest.RemoteEndPoint.ToString(), ConfigFile.IpWhiteList))
{
string ErrorPageId = "Err-IpNotWhitelisted.htm";
string ErrorPageArguments = "?IP=" + ClientRequest.RemoteEndPoint.Address.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
SendError(403, "You are not in the list of allowed clients. Contact proxy server's administrator to add your IP address in it.");
Log.WriteLine(" Non-whitelisted client.");
return;
}
//check for login to proxy if need
if (ConfigFile.Authenticate.Count > 0 && !ClientRequest.IsSecureConnection)
{
var url = ClientRequest.Url ?? new Uri("http://example.com/");
switch (url.PathAndQuery ?? "")
{
case "/!pac/":
case "/auto/":
case "/auto":
case "/auto.pac":
case "/wpad.dat":
case "/wpad.da":
//PAC is always unprotected
break;
default:
if (ConfigFile.OpenForLocalIPs && IsLanIP(ClientRequest.RemoteEndPoint.Address))
{
Log.WriteLine(" Bypassed authorization of local client.");
break;
}
if (string.IsNullOrEmpty(ClientRequest.Headers["Proxy-Authorization"]))
{
Log.WriteLine(" Unauthorized client.");
ClientResponse.AddHeader("Proxy-Authenticate", @"Basic realm=""" + ConfigFile.AuthenticateRealm + @"""");
SendError(407, ConfigFile.AuthenticateMessage);
return;
}
else
{
string auth = Encoding.Default.GetString(Convert.FromBase64String(ClientRequest.Headers["Proxy-Authorization"].Substring(6)));
if (!ConfigFile.Authenticate.Contains(auth))
{
Log.WriteLine(" Incorrect login: '{0}'.", auth);
ClientResponse.AddHeader("Proxy-Authenticate", @"Basic realm=""" + ConfigFile.AuthenticateRealm + @" (retry)""");
SendError(407, ConfigFile.AuthenticateMessage + "<p>Your login or password is not correct. Please try again.</p>");
return;
}
}
break;
}
}
//check for Secure (HTTPS) Proxy mode
if (ClientRequest.HttpMethod.ToUpper() == "CONNECT")
{
try
{
//check validness of request
if (!ClientRequest.RawUrl.Contains(':'))
{
Log.WriteLine(" Invalid CONNECT target: {0}", ClientRequest.RawUrl);
SendError(400, "Invalid request. Correct format is <pre>CONNECT example.com:443 HTTP/1.1</pre>");
return;
}
//work as HTTPS proxy
if (ClientRequest.RawUrl.EndsWith(":443"))
{
new HttpSecureServer(ClientRequest, ClientResponse, Log).Accept();
}
else
{
new HttpSecureNonHttpServer(
ClientRequest,
ClientResponse,
CheckString(ClientRequest.RawUrl.ToLowerInvariant(), ConfigFile.NonHttpSslServers),
Log)
.Accept();
}
return;
}
catch (Exception ex)
{
Log.WriteLine(" Cannot made SSL connection: {0}", ex);
SendError(501, "Sorry, an error occured on creating client SSL tunnel: " + ex.Message + "<br>Error " + ex.StackTrace.Replace("\n", "<br>")); ;
return;
}
}
//get request URL and referer URL
//think: may be need only RequestURL = ClientRequest.Url ?
try { RequestURL = new UriBuilder(ClientRequest.RawUrl).Uri; }
catch { RequestURL = ClientRequest.Url; };
string RefererUri = ClientRequest.Headers["Referer"];
if (RefererUri == "") RefererUri = null;
//check for blacklisted URL
if (CheckString(RequestURL.ToString(), ConfigFile.UrlBlackList))
{
Log.WriteLine(" Blacklisted URL.");
string ErrorPageId = "Err-UrlBlacklisted.htm";
string ErrorPageArguments = "?URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments, 403)) return;
SendError(403, "Access to this web page is disallowed by proxy settings.");
return;
}
//check for HTTP/1.0-only client
if (!string.IsNullOrWhiteSpace(ClientRequest.Headers["User-Agent"]) && CheckStringRegExp(ClientRequest.Headers["User-Agent"], ConfigFile.Http10Only.ToArray()))
{ ClientResponse.SimpleContentType = true; }
//set protocol version
ClientResponse.ProtocolVersion = ClientRequest.ProtocolVersion;
//get proxy's IP address
if (ClientRequest.LocalEndPoint.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
LocalIP = ClientRequest.LocalEndPoint.Address.ToString(); // IPv4
else
LocalIP = "[" + ClientRequest.LocalEndPoint.Address.ToString() + "]"; //IPv6
//fill variables
UriBuilder builder = new UriBuilder(RequestURL);
var DefaultVars = new Dictionary<string, string>
{
{ "URL", RequestURL.ToString() },
{ "Url", Uri.EscapeDataString(RequestURL.ToString()) },
{ "UrlDomain", builder.Host },
{ "UrlNoDomain", (builder.Query == "" ? builder.Path : builder.Path + "?" + builder.Query) },
{ "UrlNoQuery", builder.Scheme + "://" + builder.Host + "/" + builder.Path },
{ "UrlNoPort", builder.Scheme + "://" + builder.Host + "/" + (builder.Query == "" ? builder.Path : builder.Path + "?" + builder.Query) },
{ "UrlHttps", "https://" + builder.Host + "/" + (builder.Query == "" ? builder.Path : builder.Path + "?" + builder.Query) },
{ "UrlHttp", "http://" + builder.Host + "/" + (builder.Query == "" ? builder.Path : builder.Path + "?" + builder.Query) },
{ "Proxy", GetServerName() },
{ "ProxyHost", ConfigFile.DefaultHostName == Environment.MachineName ? LocalIP : ConfigFile.DefaultHostName },
{ "Method", ClientRequest.HttpMethod },
{ "HttpVersion", ClientRequest.ProtocolVersion.ToString() }
};
foreach (var entry in Program.Variables) { DefaultVars.TryAdd(entry.Key, entry.Value); }
//check for internal URL
if (ClientRequest.Kind == HttpUtil.RequestKind.StandardHttp)
{
// Internal URIs
string InternalPage = "/";
if (RequestURL.Segments.Length > 1) InternalPage = RequestURL.Segments[1].ToLower();
InternalPage = "/" + InternalPage.TrimEnd('/');
SendInternalPage(InternalPage, RequestURL.Query);
return;
}
if (ClientRequest.Kind == HttpUtil.RequestKind.AlternateProxy)
{
// "Alternate proxy access mode"
// ex. "Local proxy mode"
string FixedUrl = ClientRequest.RawUrl[1..];
if (FixedUrl.Contains(":/") && !FixedUrl.Contains("://")) FixedUrl = FixedUrl.Replace(":/", "://");
RequestURL = new Uri(FixedUrl);
Log.WriteLine(" Alternate: {0}", RequestURL);
}
if (ClientRequest.Kind == HttpUtil.RequestKind.DirtyAlternateProxy)
{
// "Dirty alternate proxy access mode", try to use last used host: http://localhost/favicon.ico = http://example.com/favicon.ico
// ex. "Dirty local proxy mode"
string FixedUrl = "http://" + new Uri(LastURL).Host + RequestURL.LocalPath;
RequestURL = new Uri(FixedUrl);
if (RequestURL.Host == "999.999.999.999") { SendError(404, "The proxy server cannot guess domain name."); return; }
Log.WriteLine(" Dirty alternate: {0}", RequestURL);
}
//if (LocalMode && ClientRequest.Headers["User-Agent"] != null && ClientRequest.Headers["User-Agent"].Contains("WebOne"))
if (ClientRequest.Headers["User-Agent"] != null && ClientRequest.Headers["User-Agent"].Contains("WebOne"))
{
SendError(403, "Loop requests are probhited.");
return;
}
//check for FTP/GOPHER/WAIS-over-HTTP requests (a.k.a. CERN Proxy Mode)
//https://support.microsoft.com/en-us/help/166961/how-to-ftp-with-cern-based-proxy-using-wininet-api
if (RequestURL.ToString().Contains("://"))
{
if (!RequestURL.Scheme.StartsWith("http")) Log.WriteLine(" CERN Proxy request to {0} detected.", RequestURL.Scheme.ToUpper());
string[] KnownProtocols = { "http", "https", "ftp" };
if (!CheckString(RequestURL.Scheme, KnownProtocols))
{
string ErrorPageId = "Err-UnknownProtocol.htm";
string ErrorPageArguments = "?Scheme=" + RequestURL.Scheme.ToUpper() + "&URL=" + ClientRequest.RawUrl;
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
string BadProtocolMessage =
"<p>You're attempted to request content from <i>" + ClientRequest.RawUrl + "</i>. " +
"The protocol specified in the URL is not supported by this proxy server.</p>" +
"<p>Consider connect directly to the server, bypassing the proxy. This error message may also appear if your Web browser settings have enabled " +
"<b>"Use proxy for all protocols"</b> option. Uncheck it and set only for protocols supported by WebOne. List of them can be found in project's Wiki.</p>";
SendInfoPage(RequestURL.Scheme.ToUpper() + " Is Not Supported", "Unsupported protocol", BadProtocolMessage, 501);
return;
}
//all CERN-style requests are processed only with HttpServer2 used to listen traffic
//old HttpServer1 does not accept them as HttpListener (used since WebOne 0.8.5) ignores non-HTTP addresses
}
if (ClientRequest.RawUrl.ToLower().StartsWith("ftp://"))
{
//HTTP->FTP mode (CERN-compatible)
InfoPage WebFtpRedirect = new();
WebFtpRedirect.Title = "CERN Proxy Emulation Redirect";
WebFtpRedirect.HttpStatusCode = 302;
WebFtpRedirect.HttpHeaders.Add("Location", "http://" + GetServerName() + "/!ftp/?client=-1&uri=" + Uri.EscapeDataString(ClientRequest.RawUrl));
SendInfoPage(WebFtpRedirect);
return;
}
if (ClientRequest.RawUrl.ToLower().StartsWith("http://ftp:"))
{
//HTTP->FTP mode (Netscape)
InfoPage WebFtpRedirect = new();
WebFtpRedirect.Title = "CERN Proxy Emulation Redirect (NS)";
WebFtpRedirect.HttpStatusCode = 302;
WebFtpRedirect.HttpHeaders.Add("Location", "http://" + GetServerName() + "/!ftp/?client=-1&uri=" + Uri.EscapeDataString(ClientRequest.RawUrl.Substring(7)));
SendInfoPage(WebFtpRedirect);
return;
}
if (ClientRequest.RawUrl.ToLower().StartsWith("http://ftp//"))
{
//HTTP->FTP mode (MS IE)
InfoPage WebFtpRedirect = new();
WebFtpRedirect.Title = "CERN Proxy Emulation Redirect (IE)";
WebFtpRedirect.HttpStatusCode = 302;
WebFtpRedirect.HttpHeaders.Add("Location", "http://" + GetServerName() + "/!ftp/?client=-1&uri=" + Uri.EscapeDataString("ftp://" + ClientRequest.RawUrl.Substring(12)));
SendInfoPage(WebFtpRedirect);
return;
}
//dirty workarounds for HTTP>HTTPS redirection bugs ("carousels")
//should redirect on 302s or reloadings from 200 and only on htmls
if ((RequestURL.AbsoluteUri == RefererUri || RequestURL.AbsoluteUri == LastURL) &&
RequestURL.AbsoluteUri != "" &&
(LastContentType.StartsWith("text/htm") || LastContentType == "") &&
(((int)LastCode > 299 && (int)LastCode < 400) || LastCode == HttpStatusCode.OK) &&
ClientRequest.HttpMethod != "POST" &&
ClientRequest.HttpMethod != "CONNECT" &&
!Program.CheckString(RequestURL.AbsoluteUri, ConfigFile.ForceHttps) &&
RequestURL.Host.ToLower() != Environment.MachineName.ToLower() &&
RequestURL.Host.ToLower() != LocalIP &&
RequestURL.Host.ToLower() != ConfigFile.DefaultHostName.ToLower())
{
Log.WriteLine(" Carousel detected.");
if (!LastURL.StartsWith("https") && !RequestURL.AbsoluteUri.StartsWith("https")) //if http is gone, try https
RequestURL = new Uri("https" + RequestURL.AbsoluteUri.Substring(4));
if (LastURL.StartsWith("https")) //if can't use https, try again http
RequestURL = new Uri("http" + RequestURL.AbsoluteUri.Substring(4));
}
//make referer secure if need
try
{
if (RequestURL.Host == new Uri(RefererUri ?? "about:blank").Host)
if (RequestURL.AbsoluteUri.StartsWith("https://") && !RefererUri.StartsWith("https://"))
RefererUri = "https" + RefererUri.Substring(4);
}
catch { }
LastURL = RequestURL.AbsoluteUri;
LastContentType = "unknown/unknown"; //will be populated in MakeOutput
LastCode = HttpStatusCode.OK; //same
//make reply
//SendError(200, "Okay, bro! Open " + RequestURL);
if (RequestURL.AbsoluteUri.Contains("??")) { SendError(400, "Too many questions."); return; }
if (RequestURL.AbsoluteUri.Length == 0) { SendError(400, "Empty URL."); return; }
if (RequestURL.AbsoluteUri == "") return;
if (RequestURL.AbsoluteUri.Contains(" ")) RequestURL = new Uri(RequestURL.AbsoluteUri.Replace(" ", "%20")); //fix spaces in wrong-formed URLs
//check for available edit sets
foreach (EditSet set in ConfigFile.EditRules)
{
if (!set.CorrectHostOS) continue;
if (CheckStringRegExp(RequestURL.AbsoluteUri, set.UrlMasks.ToArray()) &&
!CheckStringRegExp(RequestURL.AbsoluteUri, set.UrlIgnoreMasks.ToArray()))
{
if (set.HttpOnly && ClientRequest.IsSecureConnection) continue;
if (set.HttpsOnly && !ClientRequest.IsSecureConnection) continue;
if (set.HeaderMasks.Count > 0 && ClientRequest.Headers != null)
{
//check if there are headers listed in OnHeader detection rules
bool HaveGoodMask = false;
foreach (string HdrMask in set.HeaderMasks)
{
foreach (string RqHdrName in ClientRequest.Headers.AllKeys)
{
string header = RqHdrName + ": " + ClientRequest.Headers[RqHdrName];
if (Regex.IsMatch(header, HdrMask))
{
HaveGoodMask = true;
EditSets.Add(set);
break;
}
}
if (HaveGoodMask) break;
}
}
else
{
EditSets.Add(set);
}
}
}
//check for URL white list (if any)
if (ConfigFile.UrlWhiteList.Count > 0)
if (!CheckString(RequestURL.ToString(), ConfigFile.UrlWhiteList))
{
string ErrorPageId = "Err-UrlNotWhitelisted.htm";
string ErrorPageArguments = "?URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments, 403)) return;
SendError(403, "Proxy server administrator has been limited this proxy server to work with several web sites only.");
Log.WriteLine(" URL out of white list.");
return;
}
try
{
int CL = 0;
if (ClientRequest.Headers["Content-Length"] != null) CL = Int32.Parse(ClientRequest.Headers["Content-Length"]);
//make and send HTTPS request to destination server
WebHeaderCollection whc = new WebHeaderCollection();
//prepare headers
if (RequestURL.Scheme.ToLower() == "https" || CheckString(RequestURL.Host, ConfigFile.ForceHttps))
{
foreach (string h in ClientRequest.Headers.Keys)
{
whc.Add(h, ClientRequest.Headers[h].Replace("http://", "https://"));
}
}
else
{
foreach (string h in ClientRequest.Headers.Keys)
{
whc.Add(h, ClientRequest.Headers[h]);
}
}
if (whc["Origin"] == null & whc["Referer"] != null) whc.Add("Origin: " + new Uri(whc["Referer"]).Scheme + "://" + new Uri(whc["Referer"]).Host);
if (whc["User-Agent"] != null) whc["User-Agent"] = GetUserAgent(whc["User-Agent"]);
//perform edits on the request
foreach (EditSet Set in EditSets)
{
if (Set.IsForRequest)
{
//if URL mask is single, allow use RegEx groups (if any) for replace
bool UseRegEx = (Set.UrlMasks.Count == 1 && new Regex(Set.UrlMasks[0]).GetGroupNames().Count() > 1);
#if DEBUG
if (UseRegEx) Log.WriteLine(" RegExp groups are available on {0}.", Set.UrlMasks[0]);
#endif
foreach (EditSetRule Edit in Set.Edits)
{
switch (Edit.Action)
{
case "AddHeaderDumping":
case "AddRequestDumping":
case "AddDumping":
//dump initializing must be first
DumpFile = ProcessUriMasks(Edit.Value)
.Replace(":", "-")
.Replace("<", "(")
.Replace(">", ")")
.Replace("?", "-")
.Replace("|", "!");
if (DumpFile.Length > 128) { DumpFile = DumpFile.Substring(0, 128) + "-CUT.log"; } //about half of Windows path limitation
Dump(ClientRequest.HttpMethod + " " + ClientRequest.RawUrl + " HTTP/" + ClientRequest.ProtocolVersion.ToString());
break;
case "AddInternalRedirect":
string NewUrlInternal = UseRegEx ? ProcessUriMasks(new Regex(Set.UrlMasks[0]).Replace(RequestURL.AbsoluteUri, Edit.Value))
: ProcessUriMasks(Edit.Value);
Log.WriteLine(" Fix to {0} internally", NewUrlInternal);
Dump("~Internal redirect to: " + NewUrlInternal);
RequestURL = new Uri(NewUrlInternal);
break;
case "AddRedirect":
//string NewUrl302 = UseRegEx ? ProcessUriMasks(new Regex(Set.UrlMasks[0]).Replace(RequestURL.AbsoluteUri, Edit.Value))
// : ProcessUriMasks(Edit.Value);
string NewUrl302 = "";
if (UseRegEx)
{
var match = new Regex(Set.UrlMasks[0]).Match(RequestURL.AbsoluteUri);
if (match.Groups.Count > 0)
NewUrl302 = ProcessUriMasks(new Regex(Set.UrlMasks[0]).Replace(match.Groups[0].Value, Edit.Value));
else NewUrl302 = ProcessUriMasks(Edit.Value);
}
else NewUrl302 = ProcessUriMasks(Edit.Value);
Log.WriteLine(" Fix to {0}", NewUrl302);
Dump("~Redirect using 302 to: " + NewUrl302);
SendRedirect(NewUrl302, "Брось каку!");
return;
case "AddRequestHeader":
case "AddHeader":
string Header = ProcessUriMasks(Edit.Value);
Dump("~Add request header: " + Header);
if (whc[Edit.Value.Substring(0, Edit.Value.IndexOf(": "))] == null) whc.Add(Header);
break;
case "AddRequestHeaderFindReplace":
FindReplaceEditSetRule hdr_rule = (FindReplaceEditSetRule)Edit;
foreach (var hdr in whc.AllKeys)
{
whc[hdr] = whc[hdr].Replace(hdr_rule.Find, hdr_rule.Replace);
Dump("~Request header find&replace: '" + hdr_rule.Find + "' / '" + hdr_rule.Replace + "'");
}
break;
case "AddOutputEncoding":
OutputContentEncoding = GetCodePage(Edit.Value);
Dump("~Output encoding set to: " + OutputContentEncoding.BodyName);
break;
case "AddTranslit":
EnableTransliteration = ToBoolean(Edit.Value);
Dump("~Enable transliteration");
break;
}
}
}
}
foreach (var hdr in whc.AllKeys)
{
Variables.Add("Request." + hdr, whc[hdr]);
Dump(hdr + ": " + whc[hdr]);
}
Dump();
//send the request
operation = new HttpOperation(Log);
operation.Method = ClientRequest.HttpMethod;
operation.RequestHeaders = whc;
operation.URL = RequestURL;
SendRequest(operation);
}
catch (System.Net.Http.HttpRequestException httpex)
{
//an network error has been catched
Log.WriteLine(" Cannot load this page: {0}.", httpex.Message);
Dump("!Network error: " + httpex.Message);
//try to load the page from Archive.org, then return error message if need
if (!LookInWebArchive())
{
#if DEBUG
//return full debug output
string err = GetFullExceptionMessage(httpex);
SendInfoPage("WebOne cannot load the page", "Can't load the page: " + httpex.Message, "<i>" + err.ToString().Replace("\n", "<br>") + "</i><br>URL: " + RequestURL.AbsoluteUri + "<br>Debug mode enabled.");
return;
#else
//return nice error message
string ErrorTitle = "connection error", ErrorMessageHeader = "Cannot load this page", ErrorMessage = "";
if (httpex.InnerException != null)
{
switch (httpex.InnerException.GetType().ToString())
{
case "System.Net.Sockets.SocketException":
System.Net.Sockets.SocketException sockerr = httpex.InnerException as System.Net.Sockets.SocketException;
string ErrorPageId = "Err-" + sockerr.SocketErrorCode.ToString() + ".htm";
string ErrorPageArguments = "?ErrorMessage=" + sockerr.Message + "&URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
switch (sockerr.SocketErrorCode)
{
case System.Net.Sockets.SocketError.HostNotFound:
//server not found
ErrorMessageHeader = "Cannot find the server";
ErrorMessage = "<p><big>" + sockerr.Message + "</big></p>" +
"<ul><li>Check the address for typing errors such as <strong>ww</strong>.example.com instead of <strong>www</strong>.example.com.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul>";
break;
case System.Net.Sockets.SocketError.TimedOut:
//connection timeout
ErrorMessageHeader = "The connection has timed out";
ErrorMessage = "<p><big>" + sockerr.Message + "</big></p>" +
"<ul><li>The site could be temporarily unavailable or too busy. Try again in a few moments.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul>";
break;
case System.Net.Sockets.SocketError.ConnectionRefused:
//connection broken
ErrorMessageHeader = "The connection was refused";
ErrorMessage = "<p><big>" + sockerr.Message + "</big></p>" +
"<ul><li>The site could be temporarily unavailable or too busy. Try again in a few moments.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul>";
break;
case System.Net.Sockets.SocketError.ConnectionReset:
//connection reset
ErrorMessageHeader = "The connection has been reset";
ErrorMessage = "<p><big>" + sockerr.Message + "</big></p>" +
"<ul><li>The site could be temporarily unavailable or too busy. Try again in a few moments.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul>";
break;
default:
ErrorMessageHeader = "The connection can't be stablished";
ErrorMessage = "<p><big>" + sockerr.Message + "</big></p>" +
"<ul><li>The site could be temporarily unavailable or too busy. Try again in a few moments.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul><br>Error code: " + sockerr.SocketErrorCode;
break;
}
break;
case "WebOne.TlsPolicyErrorException":
//certificate is invalid (bad date, domain name, etc)
string polerr = "";
switch((httpex.InnerException as TlsPolicyErrorException).PolicyError){
case System.Net.Security.SslPolicyErrors.RemoteCertificateNotAvailable:
polerr = "Certificate is not available.";
break;
case System.Net.Security.SslPolicyErrors.RemoteCertificateNameMismatch:
polerr = "The certificate is issued for another site.";
break;
case System.Net.Security.SslPolicyErrors.RemoteCertificateChainErrors:
polerr = "Certificate chain is incorrect.";
break;
default:
polerr = httpex.InnerException.Message;
break;
}
ErrorPageId = "Err-TlsPolicyErrorException.htm";
ErrorPageArguments = "?ErrorMessage=" + polerr + "&URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
ErrorMessageHeader = "Secure connection could not be established";
ErrorMessage = "<p><big>" + polerr + "</big></p>" +
"<ul><li>The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.</li>" +
"<li>Make sure that the OS on the proxy server have all updates installed.</li>" +
"<li>Check date and time on the proxy server.</li>" +
"<li>Verify that the proxy server operating system have proper support for TLS/SSL version and chiphers used on the site.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>To disable this security check, set <q><b>ValidateCertificates=no</b></q> in proxy configuration file. But this will make the proxy less secure, do this at your own risk.</li>" +
"</ul>";
break;
default:
ErrorTitle = httpex.InnerException.GetType().ToString();
ErrorMessage = "There are problems, that are preventing from displaying the page:<br>" + GetFullExceptionMessage(httpex).Replace("\n", "<br>");
break;
}
}
else
{
ErrorTitle = httpex.InnerException.GetType().ToString();
ErrorMessage = "An error occured: " + httpex.Message;
}
ErrorMessage += "<br>URL: " + RequestURL.AbsoluteUri;
SendInfoPage("WebOne: " + ErrorTitle, ErrorMessageHeader, ErrorMessage);
return;
#endif
}
}
catch (System.Threading.Tasks.TaskCanceledException)
{
Dump("!Connection timeout (100 sec)");
string ErrorPageId = "Err-TaskCanceledException.htm";
string ErrorPageArguments = "?ErrorMessage=The request was canceled due to Timeout of 100 seconds elapsing.&URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
string ErrorMessageHeader = "The connection has timed out";
string ErrorMessage = "<p><big>The request was canceled due to Timeout of 100 seconds elapsing.</big></p>" +
"<ul><li>The site could be temporarily unavailable or too busy. Try again in a few moments.</li>" +
"<li>Try to use an <a href=\"http://web.archive.org/web/" + DateTime.Now.Year + "/" + RequestURL.AbsoluteUri + "\">" + "archived copy</a> of the web site.</li>" +
"<li>Internet Archive sometimes became busy. Be patient, wait a some time.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"<li>If your proxy server or network is protected by a firewall, make sure that WebOne is permitted to access the Web.</li>" +
"</ul>";
ErrorMessage += "<br>URL: " + RequestURL.AbsoluteUri;
SendInfoPage("WebOne: Operation timeout", ErrorMessageHeader, ErrorMessage);
return;
}
catch (InvalidDataException)
{
Dump("!Decompression failed");
string ErrorPageId = "Err-InvalidDataException.htm";
string ErrorPageArguments = "?ErrorMessage=Cannot decode HTTP data.&URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments)) return;
string ErrorMessageHeader = "Invalid data has been recieved";
string ErrorMessage = "<p><big>Cannot decode HTTP data.</big></p>" +
"<ul>Remote server may use unsupported HTTP compression algorithm." +
"<li>Try to set AllowHttpCompression=false option in configuration file to skip HTTP decompression, which may cause this error due to .NET bug.</li>" +
"<li>Installing a newer version of .NET Runtime also <i>may</i> solve the problem.</li>" +
"<li>If you are unable to load any pages, check your proxy server's network connection.</li>" +
"</ul>";
ErrorMessage += "<br>URL: " + RequestURL.AbsoluteUri;
SendInfoPage("WebOne: Decompression failed", ErrorMessageHeader, ErrorMessage, 500);
return;
}
catch (UriFormatException)
{
Dump("!Invalid URL");
SendError(400, "The URL <b>" + RequestURL.AbsoluteUri + "</b> is not valid.");
return;
}
catch (Exception ex)
{
try { Dump("!Guru meditation: " + ex.Message); } catch { }
Log.WriteLine(" ============GURU MEDITATION:\n{1}\nOn URL '{2}', Method '{3}'. Returning 500.============", null, ex.ToString(), RequestURL.AbsoluteUri, ClientRequest.HttpMethod);
SendError(500, "Guru meditaion at URL " + RequestURL.AbsoluteUri + ":<br><b>" + ex.Message + "</b><br><i>" + ex.StackTrace.Replace("\n", "\n<br>") + "</i>");
return;
}
//look in Web Archive if 404
if (ResponseCode >= 403 && ConfigFile.SearchInArchive && ClientRequest.HttpMethod != "POST" && ClientRequest.HttpMethod != "PUT" && !Stop)
{
LookInWebArchive();
}
//shorten Web Archive error page if need
if (ResponseCode >= 403 && RequestURL.AbsoluteUri.StartsWith("http://web.archive.org/web/") && ConfigFile.ShortenArchiveErrors)
{
Log.WriteLine(" Wayback Machine error page shortened.");
string ErrorPageId = "Err-WA" + ResponseCode + ".htm";
string ErrorPageArguments = "?ErrorMessage=" + ((HttpStatusCode)ResponseCode).ToString() + "&URL=" + RequestURL.AbsoluteUri.ToString();
if (SendInternalContent(ErrorPageId, ErrorPageArguments, ResponseCode)) return;
switch (ResponseCode)
{
case 404:
string ErrMsg404 =
"<p><b>The Wayback Machine has not archived that URL.</b></p>" +
"<p>Try to slightly change the URL.</p>" +
"<small><i>You see this message because ShortenArchiveErrors option is enabled.</i></small>";
SendError(404, ErrMsg404);
return;
case 403:
string ErrMsg403 =
"<p><b>This URL has been excluded from the Wayback Machine.</b></p>" +
"<p>This page is not present in Web Archive.</p>" +
"<small><i>You see this message because ShortenArchiveErrors option is enabled.</i></small>";
SendError(404, ErrMsg403);
return;
default:
string ErrMsg000 =
"<p><b>The Wayback Machine cannot give this page.</b></p>" +
"<p>This is reason: " + ((HttpStatusCode)ResponseCode).ToString() + ".</p>" +
"<small><i>You see this message because ShortenArchiveErrors option is enabled.</i></small>";
SendError(404, ErrMsg000);
return;
}
}
//try to return...
try
{
if (true)
{
//ClientResponse.ProtocolVersion = new Version(1, 1);
ClientResponse.StatusCode = ResponseCode;
ClientResponse.AddHeader("Via", "HTTP/1.0 WebOne/" + System.Reflection.Assembly.GetExecutingAssembly().GetName().Version);
if (string.IsNullOrEmpty(ClientResponse.Headers["Content-Type"]) && !string.IsNullOrEmpty(ContentType))
{
ClientResponse.AddHeader("Content-Type", ContentType);
}
if (TransitStream == null)
{
byte[] RespBuffer;
RespBuffer = (OutputContentEncoding ?? SourceContentEncoding).GetBytes(ResponseBody).ToArray();
ClientResponse.ContentLength64 = RespBuffer.Length;
if (ClientResponse.ContentLength64 > 300 * 1024) Log.WriteLine(" Sending binary.");
if (ClientRequest.KeepAlive) ClientResponse.AddHeader("Proxy-Connection", "keep-alive");
ClientResponse.SendHeaders();
ClientResponse.OutputStream.Write(RespBuffer, 0, RespBuffer.Length);
if (DumpFile != null)
{
foreach (var hdr in ClientResponse.Headers.AllKeys)
{
Dump(hdr + ": " + ClientResponse.Headers[hdr]);
}
Dump("\n");
if (ClientResponse.ContentLength64 < 1024) Dump(ResponseBody);
else Dump("Over 1 KB response body");
}
}
else
{
if (TransitStream.CanSeek) ClientResponse.ContentLength64 = TransitStream.Length;
if (ClientRequest.KeepAlive) ClientResponse.AddHeader("Proxy-Connection", "keep-alive");
ClientResponse.SendHeaders();
TransitStream.CopyTo(ClientResponse.OutputStream);
if (DumpFile != null)
{
foreach (var hdr in ClientResponse.Headers.AllKeys)
{
Dump(hdr + ": " + ClientResponse.Headers[hdr]);
}
Dump("\nBody is binary stream");
}
}
ClientResponse.KeepAlive = true;
ClientResponse.Close();
#if DEBUG
Log.WriteLine(" Document sent.");
#endif
}
}
catch (Exception ex)
{
if (!ConfigFile.HideClientErrors)
#if DEBUG
Log.WriteLine("<Can't return reply. " + ex.Message + ex.StackTrace);
#else
Log.WriteLine("<Can't return reply. " + ex.Message);
#endif
}
}
catch (Exception E)
{
Log.WriteLine(" A error has been catched: {1}\n{0}\t Please report to author.", null, E.ToString().Replace("\n", "\n{0}\t "));
SendError(500, "An error occured: " + E.ToString().Replace("\n", "\n<BR>"));
}
try { Dump("END."); } catch { }
#if DEBUG
Log.WriteLine(" End process.");
#endif
}
/// <summary>
/// Send an internal page.
/// </summary>
/// <param name="InternalPageId">Name of internal page (lowercase, never ends with "/").</param>
private void SendInternalPage(string InternalPageId, string Arguments)
{
try
{
Log.WriteLine(" Internal page: {0} ", InternalPageId);
switch (InternalPageId)
{
case "/":
case "/!":
case "/!/":
SendInternalStatusPage();
return;
case "/!codepages":
case "/!codepages/":
string codepages = "<p>The following code pages are available: <br>\n" +
"<table><tr><td><b>Name</b></td><td><b>#</b></td><td><b>Description</b></td></tr>\n";
codepages += "<tr><td><b>AsIs</b></td><td>0</td><td>Keep original encoding (code page)</td></tr>\n";
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
bool IsOutputEncodingListed = false;
foreach (EncodingInfo cp in Encoding.GetEncodings())
{
codepages += "<tr><td>";
codepages += "<b>" + cp.Name + "</b></td><td>" + cp.CodePage + "</td><td>" + cp.DisplayName;
if (ConfigFile.OutputEncoding != null && cp.CodePage == ConfigFile.OutputEncoding.CodePage)
{
codepages += " <b>(Current)</b>";
IsOutputEncodingListed = true;
}
/*codepages += "<td>";
if (GetCodePage("Win").CodePage == cp.CodePage) codepages += "Windows "ANSI"";
if (GetCodePage("DOS").CodePage == cp.CodePage) codepages += "DOS "OEM"";
if (GetCodePage("Mac").CodePage == cp.CodePage) codepages += "MacOS classic";
if (GetCodePage("ISO").CodePage == cp.CodePage) codepages += "ISO";
if (GetCodePage("EBCDIC").CodePage == cp.CodePage) codepages += "IBM EBCDIC";
codepages += "</td>";*/
codepages += "</td></tr>\n";
}
codepages += "</table><br>Use any of these or from <a href=\"http://docs.microsoft.com/en-us/dotnet/api/system.text.encoding.getencodings?view=net-6.0\">.NET documentation</a>.</p>\n";
codepages += "<p>Code pages for current server's locale:\n" +
"<table>" +
"<tr><td>Windows "ANSI"</td><td>" + GetCodePage("Win").WebName + "</td></tr>\n" +
"<tr><td>DOS "OEM"</td><td>" + GetCodePage("DOS").WebName + "</td></tr>\n" +
"<tr><td>MacOS classic</td><td>" + GetCodePage("Mac").WebName + "</td></tr>\n" +
"<tr><td>ISO</td><td>" + GetCodePage("ISO").WebName + "</td></tr>\n" +
"<tr><td>EBCDIC</td><td>" + GetCodePage("EBCDIC").WebName + "</td></tr>\n" +
"</table>Clients without UTF-8 support will got content in these code pages.</p>\n";
if (!IsOutputEncodingListed && ConfigFile.OutputEncoding != null)
codepages += "<br>Current output encoding: <b>" + ConfigFile.OutputEncoding.WebName + "</b> "" + ConfigFile.OutputEncoding.EncodingName + "" (# " + ConfigFile.OutputEncoding.CodePage + ").\n";
if (ConfigFile.OutputEncoding == null)
codepages += "<br>Current output encoding: <b>same as source</b>.\n";
SendInfoPage("WebOne: List of supported code pages", "Content encodings", codepages);
return;
case "/!img-test":
case "/!img-test/":
if (ConfigFile.EnableManualConverting)
{
SendError(200, @"ImageMagick test.<br><img src=""/!convert/?src=logo.webp&dest=gif&type=image/gif"" alt=""ImageMagick logo"" width=640 height=480><br>A wizard should appear nearby.");
return;
}
else
{
SendError(200, @"ImageMagick test.<br><img src=""/!imagemagicktest.gif"" alt=""ImageMagick logo"" width=640 height=480><br>A wizard should appear nearby.");
return;
}
case "/!imagemagicktest.gif":
foreach (Converter Cvt in ConfigFile.Converters)
{
if (Cvt.Executable == "convert" && !Cvt.SelfDownload)
{
var SrcStream = File.OpenRead("logo.webp");
SendStream(Cvt.Run(Log, SrcStream, "", "", "gif", "https://github.com/atauenis/webone/"), "image/gif", true);
return;
}
}
SendInfoPage("WebOne: ImageMagick error",
"Error",
"<p>ImageMagick's <b>convert</b> utility is not properly registered in <b>[Converters]</b> section of proxy configuration.</p>" +
"<p>Make sure that the line is present in <code>[Converters]</code> section of configuration: <code>convert %SRC% %ARG1% %DESTEXT%:- %ARG2%</code></p>",
500);
return;
case "/!convert":
case "/!convert/":
if (!ConfigFile.EnableManualConverting)
{
SendInfoPage("WebOne: Feature disabled", "Feature disabled", "Manual file converting is disabled for security purposes.<br>Proxy administrator can enable it via <code>[Server]</code> section, <code>EnableManualConverting</code> option.", 500);
return;
}
string SrcUrl = "", Src = "", Dest = "xbm", DestMime = "image/x-xbitmap", Converter = "convert", Args1 = "", Args2 = "";
//parse URL
Match FindSrc = Regex.Match(RequestURL.Query, @"(src)=([^&]+)");
Match FindSrcUrl = Regex.Match(RequestURL.Query, @"(url)=([^&]+)");
Match FindDest = Regex.Match(RequestURL.Query, @"(dest)=([^&]+)");
Match FindDestMime = Regex.Match(RequestURL.Query, @"(type)=([^&]+)");
Match FindConverter = Regex.Match(RequestURL.Query, @"(util)=([^&]+)");
Match FindArg1 = Regex.Match(RequestURL.Query, @"(arg)=([^&]+)");
Match FindArg2 = Regex.Match(RequestURL.Query, @"(arg2)=([^&]+)");
if (FindSrc.Success)
Src = Uri.UnescapeDataString(FindSrc.Groups[2].Value);
if (FindSrcUrl.Success)
SrcUrl = Uri.UnescapeDataString(FindSrcUrl.Groups[2].Value);
//BUG: sometimes URL gets unescaped when opening via WMP
// (mostly via UI, and all load retries via FF plugin, strange but 1st plugin's attempt is valid)
if (FindDest.Success)
Dest = Uri.UnescapeDataString(FindDest.Groups[2].Value);
if (FindDestMime.Success)
DestMime = Uri.UnescapeDataString(FindDestMime.Groups[2].Value);
if (FindConverter.Success)
Converter = Uri.UnescapeDataString(FindConverter.Groups[2].Value);
if (FindArg1.Success)
Args1 = Uri.UnescapeDataString(FindArg1.Groups[2].Value);
if (FindArg2.Success)
Args2 = Uri.UnescapeDataString(FindArg2.Groups[2].Value);
if (Src == "CON:") throw new ArgumentException("Bad source file name");
//detect info page requestion
if (!FindSrcUrl.Success && !FindSrc.Success)
{
SendError(200, "<big>Here you can summon ImageMagick to convert a picture file</big>.<br>" +
"<p>Usage: /!convert/?url=https://example.com/filename.ext&dest=gif&type=image/gif<br>" +
"or: /!convert/?src=filename.ext&dest=gif&type=image/gif</p>" +
"<p>See <a href=\"http://github.com/atauenis/webone/wiki\">WebOne wiki</a> for help on this.</p>");
return;
}
//find converter and use it
foreach (Converter Cvt in ConfigFile.Converters)
{
if (Cvt.Executable == Converter)
{
HttpOperation HOper = new HttpOperation(Log);
Stream SrcStream = null;
//find source file placement
if (FindSrcUrl.Success)
{
//download source file
if (!Cvt.SelfDownload) try
{
HOper.URL = new Uri(SrcUrl);
HOper.Method = "GET";
HOper.RequestHeaders = new WebHeaderCollection();
#if DEBUG
Log.WriteLine(">Downloading source stream (connecting)...");
#else
Log.WriteLine(">Downloading source stream...");
#endif
HOper.SendRequest();