From 549a391d6438e828001eeeaf235b080c054a7bf3 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 08:14:41 +0200 Subject: Adding upstream version 2.2.4. Signed-off-by: Daniel Baumann --- test/interactive-helper/aptwebserver.cc | 1090 +++++++++++++++++++++++++++++++ 1 file changed, 1090 insertions(+) create mode 100644 test/interactive-helper/aptwebserver.cc (limited to 'test/interactive-helper/aptwebserver.cc') diff --git a/test/interactive-helper/aptwebserver.cc b/test/interactive-helper/aptwebserver.cc new file mode 100644 index 0000000..58ba54f --- /dev/null +++ b/test/interactive-helper/aptwebserver.cc @@ -0,0 +1,1090 @@ +#include + +#include +#include +#include +#include +#include + +#include "teestream.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static std::string HTMLEncode(std::string encode) /*{{{*/ +{ + constexpr std::array,6> htmlencode = {{ + {{ "&", "&" }}, + {{ "<", "<" }}, + {{ ">", ">" }}, + {{ "\"", """ }}, + {{ "'", "'" }}, + {{ "/", "/" }}, + }}; + for (auto &&h: htmlencode) + encode = SubstVar(encode, h[0], h[1]); + return encode; +} + /*}}}*/ +static std::string httpcodeToStr(int const httpcode) /*{{{*/ +{ + switch (httpcode) + { + // Informational 1xx + case 100: return _config->Find("aptwebserver::httpcode::100", "100 Continue"); + case 101: return _config->Find("aptwebserver::httpcode::101", "101 Switching Protocols"); + // Successful 2xx + case 200: return _config->Find("aptwebserver::httpcode::200", "200 OK"); + case 201: return _config->Find("aptwebserver::httpcode::201", "201 Created"); + case 202: return _config->Find("aptwebserver::httpcode::202", "202 Accepted"); + case 203: return _config->Find("aptwebserver::httpcode::203", "203 Non-Authoritative Information"); + case 204: return _config->Find("aptwebserver::httpcode::204", "204 No Content"); + case 205: return _config->Find("aptwebserver::httpcode::205", "205 Reset Content"); + case 206: return _config->Find("aptwebserver::httpcode::206", "206 Partial Content"); + // Redirections 3xx + case 300: return _config->Find("aptwebserver::httpcode::300", "300 Multiple Choices"); + case 301: return _config->Find("aptwebserver::httpcode::301", "301 Moved Permanently"); + case 302: return _config->Find("aptwebserver::httpcode::302", "302 Found"); + case 303: return _config->Find("aptwebserver::httpcode::303", "303 See Other"); + case 304: return _config->Find("aptwebserver::httpcode::304", "304 Not Modified"); + case 305: return _config->Find("aptwebserver::httpcode::305", "305 Use Proxy"); + case 307: return _config->Find("aptwebserver::httpcode::307", "307 Temporary Redirect"); + case 308: return _config->Find("aptwebserver::httpcode::308", "308 Permanent Redirect"); + // Client errors 4xx + case 400: return _config->Find("aptwebserver::httpcode::400", "400 Bad Request"); + case 401: return _config->Find("aptwebserver::httpcode::401", "401 Unauthorized"); + case 402: return _config->Find("aptwebserver::httpcode::402", "402 Payment Required"); + case 403: return _config->Find("aptwebserver::httpcode::403", "403 Forbidden"); + case 404: return _config->Find("aptwebserver::httpcode::404", "404 Not Found"); + case 405: return _config->Find("aptwebserver::httpcode::405", "405 Method Not Allowed"); + case 406: return _config->Find("aptwebserver::httpcode::406", "406 Not Acceptable"); + case 407: return _config->Find("aptwebserver::httpcode::407", "407 Proxy Authentication Required"); + case 408: return _config->Find("aptwebserver::httpcode::408", "408 Request Time-out"); + case 409: return _config->Find("aptwebserver::httpcode::409", "409 Conflict"); + case 410: return _config->Find("aptwebserver::httpcode::410", "410 Gone"); + case 411: return _config->Find("aptwebserver::httpcode::411", "411 Length Required"); + case 412: return _config->Find("aptwebserver::httpcode::412", "412 Precondition Failed"); + case 413: return _config->Find("aptwebserver::httpcode::413", "413 Request Entity Too Large"); + case 414: return _config->Find("aptwebserver::httpcode::414", "414 Request-URI Too Large"); + case 415: return _config->Find("aptwebserver::httpcode::415", "415 Unsupported Media Type"); + case 416: return _config->Find("aptwebserver::httpcode::416", "416 Requested range not satisfiable"); + case 417: return _config->Find("aptwebserver::httpcode::417", "417 Expectation Failed"); + case 418: return _config->Find("aptwebserver::httpcode::418", "418 I'm a teapot"); + // Server error 5xx + case 500: return _config->Find("aptwebserver::httpcode::500", "500 Internal Server Error"); + case 501: return _config->Find("aptwebserver::httpcode::501", "501 Not Implemented"); + case 502: return _config->Find("aptwebserver::httpcode::502", "502 Bad Gateway"); + case 503: return _config->Find("aptwebserver::httpcode::503", "503 Service Unavailable"); + case 504: return _config->Find("aptwebserver::httpcode::504", "504 Gateway Time-out"); + case 505: return _config->Find("aptwebserver::httpcode::505", "505 HTTP Version not supported"); + } + std::string codeconf, code; + strprintf(codeconf, "aptwebserver::httpcode::%i", httpcode); + strprintf(code, "%i Unknown HTTP code", httpcode); + return _config->Find(codeconf, code); +} + /*}}}*/ +static bool chunkedTransferEncoding(std::list const &headers)/*{{{*/ +{ + if (std::find(headers.begin(), headers.end(), "Transfer-Encoding: chunked") != headers.end()) + return true; + if (_config->FindB("aptwebserver::chunked-transfer-encoding", false) == true) + return true; + return false; +} + /*}}}*/ +static bool contentTypeSet(std::list const &headers) /*{{{*/ +{ + return std::any_of(headers.begin(), headers.end(), [](std::string const &h) { return APT::String::Startswith(h, "Content-Type:"); }); +} + /*}}}*/ +// contentTypeFromExtension /*{{{*/ +static std::string contentTypeFromExtension(std::string const &ext) +{ + auto t = _config->Find(std::string("aptwebserver::content-type::by-extension::").append(ext)); + if (APT::String::Startswith(t, "text/")) + return t.append("; charset=utf-8"); + return t; +} + /*}}}*/ +static void addFileHeaders(std::list &headers, FileFd &data)/*{{{*/ +{ + if (chunkedTransferEncoding(headers) == false) + { + std::ostringstream contentlength; + contentlength << "Content-Length: " << data.FileSize(); + headers.push_back(contentlength.str()); + } + if (_config->FindB("aptwebserver::support::last-modified", true) == true) + { + std::string lastmodified("Last-Modified: "); + lastmodified.append(TimeRFC1123(data.ModificationTime(), false)); + headers.push_back(lastmodified); + } + if (_config->FindB("aptwebserver::content-type::guess", true) && + data.FileSize() != 0 && + contentTypeSet(headers) == false) + { + std::string const name = data.Name(); + std::string ext = flExtension(name); + if (name.empty() == false && ext.empty() == false && name != ext) + { + std::transform(ext.begin(), ext.end(), ext.begin(), ::tolower); + auto const type = contentTypeFromExtension(ext); + if (type.empty() == false) + headers.push_back(std::string("Content-Type: ").append(type)); + } + } +} + /*}}}*/ +static void addDataHeaders(std::list &headers, std::string &data)/*{{{*/ +{ + if (chunkedTransferEncoding(headers) == false) + { + std::ostringstream contentlength; + contentlength << "Content-Length: " << data.size(); + headers.push_back(contentlength.str()); + } +} + /*}}}*/ +static bool sendHead(std::ostream &log, int const client, int const httpcode, std::list &headers)/*{{{*/ +{ + std::string response("HTTP/1.1 "); + response.append(httpcodeToStr(httpcode)); + headers.push_front(response); + _config->Set("APTWebserver::Last-Status-Code", httpcode); + + std::stringstream buffer; + auto const empties = _config->FindVector("aptwebserver::empty-response-header"); + for (auto const &e: empties) + buffer << e << ":" << std::endl; + _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false); + std::vector addheaders = VectorizeString(buffer.str(), '\n'); + for (std::vector::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h) + headers.push_back(*h); + + std::string date("Date: "); + date.append(TimeRFC1123(time(NULL), false)); + headers.push_back(date); + + if (chunkedTransferEncoding(headers) == true) + headers.push_back("Transfer-Encoding: chunked"); + + log << ">>> RESPONSE to " << client << " >>>" << std::endl; + bool Success = true; + for (std::list::const_iterator h = headers.begin(); + Success == true && h != headers.end(); ++h) + { + Success &= FileFd::Write(client, h->c_str(), h->size()); + if (Success == true) + Success &= FileFd::Write(client, "\r\n", 2); + log << *h << std::endl; + } + if (Success == true) + Success &= FileFd::Write(client, "\r\n", 2); + log << "<<<<<<<<<<<<<<<<" << std::endl; + return Success; +} + /*}}}*/ +static bool sendFile(int const client, std::list const &headers, FileFd &data)/*{{{*/ +{ + bool Success = true; + bool const chunked = chunkedTransferEncoding(headers); + char buffer[500]; + unsigned long long actual = 0; + while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true) + { + if (actual == 0) + break; + + if (chunked == true) + { + std::string size; + strprintf(size, "%llX\r\n", actual); + Success &= FileFd::Write(client, size.c_str(), size.size()); + Success &= FileFd::Write(client, buffer, actual); + Success &= FileFd::Write(client, "\r\n", strlen("\r\n")); + } + else + Success &= FileFd::Write(client, buffer, actual); + } + if (chunked == true) + { + char const * const finish = "0\r\n\r\n"; + Success &= FileFd::Write(client, finish, strlen(finish)); + } + if (Success == false) + std::cerr << "SENDFILE:" << (chunked ? " CHUNKED" : "") << " READ/WRITE ERROR to " << client << std::endl; + return Success; +} + /*}}}*/ +static bool sendData(int const client, std::list const &headers, std::string const &data)/*{{{*/ +{ + if (chunkedTransferEncoding(headers) == true) + { + unsigned long long const ullsize = data.length(); + std::string size; + strprintf(size, "%llX\r\n", ullsize); + char const * const finish = "\r\n0\r\n\r\n"; + if (FileFd::Write(client, size.c_str(), size.length()) == false || + FileFd::Write(client, data.c_str(), ullsize) == false || + FileFd::Write(client, finish, strlen(finish)) == false) + { + std::cerr << "SENDDATA: CHUNK WRITE ERROR to " << client << std::endl; + return false; + } + } + else if (FileFd::Write(client, data.c_str(), data.size()) == false) + { + std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl; + return false; + } + return true; +} + /*}}}*/ +static void sendError(std::ostream &log, int const client, int const httpcode, std::string const &request,/*{{{*/ + bool const content, std::string const &error, std::list &headers) +{ + auto const quotedCode = HTMLEncode(httpcodeToStr(httpcode)); + std::string response(""); + response.append(quotedCode).append(""); + response.append("

").append(quotedCode).append("

"); + if (httpcode != 200) + response.append("

Error: "); + else + response.append("

Success: "); + if (error.empty() == false) + response.append(HTMLEncode(error)); + else + response.append(quotedCode); + if (httpcode != 200) + response.append("

This error is a result of the request: 
");
+   else
+      response.append("The successfully executed operation was requested by: 
");
+   response.append(HTMLEncode(request)).append("
");
+   if (httpcode != 200)
+   {
+      if (_config->FindB("aptwebserver::closeOnError", false) == true)
+	 headers.push_back("Connection: close");
+   }
+   addDataHeaders(headers, response);
+
+   if (contentTypeSet(headers) == false)
+      headers.push_back("Content-Type: text/html; charset=utf-8");
+
+   sendHead(log, client, httpcode, headers);
+   if (content == true)
+      sendData(client, headers, response);
+}
+static void sendSuccess(std::ostream &log, int const client, std::string const &request,
+	       bool const content, std::string const &error, std::list &headers)
+{
+   sendError(log, client, 200, request, content, error, headers);
+}
+									/*}}}*/
+static void sendRedirect(std::ostream &log, int const client, int const httpcode,/*{{{*/
+		  std::string const &uri, std::string const &request, bool content)
+{
+   std::list headers;
+   auto const quotedCode = HTMLEncode(httpcodeToStr(httpcode));
+   std::string response("");
+   response.append(quotedCode).append("");
+   response.append("
").append(quotedCode).append("You should be redirected to ").append(HTMLEncode(uri)).append("
");
+   response.append("This page is a result of the request: 
");
+   response.append(HTMLEncode(request)).append("
");
+   addDataHeaders(headers, response);
+   std::string location("Location: ");
+   if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
+   {
+      std::string const host = LookupTag(request, "Host");
+      unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
+      std::string hosthttpsport;
+      strprintf(hosthttpsport, ":%u", httpsport);
+      if (host.find(hosthttpsport) != std::string::npos)
+	 location.append("https://");
+      else
+	 location.append("http://");
+      location.append(host).append("/");
+      if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
+      {
+	 std::string homeuri = SubstVar(uri, "/home/", "~");
+	 homeuri = SubstVar(homeuri, "/public_html/", "/");
+	 location.append(homeuri);
+      }
+      else
+	 location.append(uri);
+   }
+   else
+      location.append(uri);
+   headers.push_back(location);
+
+   if (contentTypeSet(headers) == false)
+      headers.push_back("Content-Type: text/html; charset=utf-8");
+
+   sendHead(log, client, httpcode, headers);
+   if (content == true)
+      sendData(client, headers, response);
+}
+									/*}}}*/
+static int filter_hidden_files(const struct dirent *a)			/*{{{*/
+{
+   if (a->d_name[0] == '.')
+      return 0;
+#ifdef _DIRENT_HAVE_D_TYPE
+   // if we have the d_type check that only files and dirs will be included
+   if (a->d_type != DT_UNKNOWN &&
+       a->d_type != DT_REG &&
+       a->d_type != DT_LNK && // this includes links to regular files
+       a->d_type != DT_DIR)
+      return 0;
+#endif
+   return 1;
+}
+static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
+#ifdef _DIRENT_HAVE_D_TYPE
+   if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
+   else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
+      return -1;
+   else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
+      return 1;
+   else
+#endif
+   {
+      struct stat f_prop; //File's property
+      stat((*a)->d_name, &f_prop);
+      int const amode = f_prop.st_mode;
+      stat((*b)->d_name, &f_prop);
+      int const bmode = f_prop.st_mode;
+      if (S_ISDIR(amode) && S_ISDIR(bmode));
+      else if (S_ISDIR(amode))
+	 return -1;
+      else if (S_ISDIR(bmode))
+	 return 1;
+   }
+   return strcasecmp((*a)->d_name, (*b)->d_name);
+}
+									/*}}}*/
+static void sendDirectoryListing(std::ostream &log, int const client, std::string const &dir,/*{{{*/
+			  std::string const &request, bool content, std::list &headers)
+{
+   struct dirent **namelist;
+   int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
+   if (counter == -1)
+   {
+      sendError(log, client, 500, request, content, "scandir failed", headers);
+      return;
+   }
+
+   std::ostringstream listing;
+   std::string const quotedDir = HTMLEncode(dir);
+   listing << "Index of " << quotedDir << ""
+	   << ""
+	   << "" << std::endl
+	   << "
Index of " << quotedDir << "
" << std::endl
+	   << "" << std::endl;
+   if (dir != "./")
+      listing << "";
+   for (int i = 0; i < counter; ++i) {
+      struct stat fs;
+      std::string filename(dir);
+      filename.append("/").append(namelist[i]->d_name);
+      stat(filename.c_str(), &fs);
+      std::string const quotedHref = QuoteString(namelist[i]->d_name, "\"\\/#?");
+      std::string const quotedName = HTMLEncode(namelist[i]->d_name);
+      bool const isDir = S_ISDIR(fs.st_mode);
+      listing << ""
+	 << ""
+	 << ""
+	 << "\n";
+   }
+   listing << "
#NameSizeLast-Modified
dParent Directory--
" << (isDir ? 'd' : 'f') << "" << quotedName << "" << (isDir ? "-" : SizeToStr(fs.st_size).append("B")) << "" << TimeRFC1123(fs.st_mtime, true) << "
" << std::endl;
+
+   if (contentTypeSet(headers) == false)
+      headers.push_back("Content-Type: text/html; charset=utf-8");
+
+   std::string response(listing.str());
+   addDataHeaders(headers, response);
+   sendHead(log, client, 200, headers);
+   if (content == true)
+      sendData(client, headers, response);
+}
+									/*}}}*/
+static bool parseFirstLine(std::ostream &log, int const client, std::string const &request,/*{{{*/
+		    std::string &filename, std::string ¶ms, bool &sendContent,
+		    bool &closeConnection, std::list &headers)
+{
+   if (strncmp(request.c_str(), "HEAD ", 5) == 0)
+      sendContent = false;
+   if (strncmp(request.c_str(), "GET ", 4) != 0)
+   {
+      sendError(log, client, 501, request, true, "", headers);
+      return false;
+   }
+
+   size_t const lineend = request.find('\n');
+   size_t filestart = request.find(' ');
+   for (; request[filestart] == ' '; ++filestart);
+   size_t fileend = request.rfind(' ', lineend);
+   if (lineend == std::string::npos || filestart == std::string::npos ||
+	 fileend == std::string::npos || filestart == fileend)
+   {
+      sendError(log, client, 500, request, sendContent, "Filename can't be extracted", headers);
+      return false;
+   }
+
+   size_t httpstart = fileend;
+   for (; request[httpstart] == ' '; ++httpstart);
+   if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
+      closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
+   else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
+      closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
+   else
+   {
+      sendError(log, client, 500, request, sendContent, "Not an HTTP/1.{0,1} request", headers);
+      return false;
+   }
+
+   filename = request.substr(filestart, fileend - filestart);
+   if (filename.find(' ') != std::string::npos)
+   {
+      sendError(log, client, 500, request, sendContent, "Filename contains an unencoded space", headers);
+      return false;
+   }
+
+   std::string host = LookupTag(request, "Host", "");
+   if (host.empty() == true)
+   {
+      // RFC 2616 §14.23 requires Host
+      sendError(log, client, 400, request, sendContent, "Host header is required", headers);
+      return false;
+   }
+   host = "http://" + host;
+
+   // Proxies require absolute uris, so this is a simple proxy-fake option
+   std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
+   if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
+   {
+      if (absolute.find("uri") == std::string::npos)
+      {
+	 sendError(log, client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
+	 return false;
+      }
+
+      // strip the host from the request to make it an absolute path
+      filename.erase(0, host.length());
+
+      std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
+      std::string auth = LookupTag(request, "Proxy-Authorization", "");
+      if (authConf.empty() != auth.empty())
+      {
+	 if (auth.empty())
+	    sendError(log, client, 407, request, sendContent, "Proxy requires authentication", headers);
+	 else
+	    sendError(log, client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
+	return false;
+      }
+      if (authConf.empty() == false)
+      {
+	 char const * const basic = "Basic ";
+	 if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
+	 {
+	    auth.erase(0, strlen(basic));
+	    if (auth != authConf)
+	    {
+	       sendError(log, client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
+	       return false;
+	    }
+	 }
+	 else
+	 {
+	    std::list headers;
+	    headers.push_back("Proxy-Authenticate: Basic");
+	    sendError(log, client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
+	    return false;
+	 }
+      }
+   }
+   else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
+   {
+      sendError(log, client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
+      return false;
+   }
+
+   if (APT::String::Startswith(filename, "/_config/") == false)
+   {
+      std::string const authConf = _config->Find("aptwebserver::authorization", "");
+      std::string auth = LookupTag(request, "Authorization", "");
+      if (authConf.empty() != auth.empty())
+      {
+	 if (auth.empty())
+	    sendError(log, client, 401, request, sendContent, "Server requires authentication", headers);
+	 else
+	    sendError(log, client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
+	 return false;
+      }
+      if (authConf.empty() == false)
+      {
+	 char const * const basic = "Basic ";
+	 if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
+	 {
+	    auth.erase(0, strlen(basic));
+	    if (auth != authConf)
+	    {
+	       sendError(log, client, 401, request, sendContent, "Authentication doesn't match", headers);
+	       return false;
+	    }
+	 }
+	 else
+	 {
+	    headers.push_back("WWW-Authenticate: Basic");
+	    sendError(log, client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
+	    return false;
+	 }
+      }
+   }
+
+   size_t paramspos = filename.find('?');
+   if (paramspos != std::string::npos)
+   {
+      params = filename.substr(paramspos + 1);
+      filename.erase(paramspos);
+   }
+   else if (APT::String::Startswith(filename, "/_config/"))
+   {
+      filename.erase(0, 1);
+      return true;
+   }
+
+   filename = DeQuoteString(filename);
+
+   // this is not a secure server, but at least prevent the obvious …
+   if (filename.empty() == true || filename[0] != '/' ||
+       strncmp(filename.c_str(), "//", 2) == 0 ||
+       filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
+       filename.find("/../") != std::string::npos)
+   {
+      std::list headers;
+      sendError(log, client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
+      return false;
+   }
+
+   // nuke the first character which is a / as we assured above
+   filename.erase(0, 1);
+   if (filename.empty() == true)
+      filename = "./";
+   // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
+   else if (filename[0] == '~')
+   {
+      // /home/user is actually not entirely correct, but good enough for now
+      size_t dashpos = filename.find('/');
+      if (dashpos != std::string::npos)
+      {
+	 std::string home = filename.substr(1, filename.find('/') - 1);
+	 std::string pubhtml = filename.substr(filename.find('/') + 1);
+	 filename = "/home/" + home + "/public_html/" + pubhtml;
+      }
+      else
+	 filename = "/home/" + filename.substr(1) + "/public_html/";
+   }
+
+   // if no filename is given, but a valid directory see if we can use an index or
+   // have to resort to a autogenerated directory listing later on
+   if (DirectoryExists(filename) == true)
+   {
+      std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
+      if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
+	    RealFileExists(filename + directoryIndex) == true)
+	 filename += directoryIndex;
+   }
+
+   return true;
+}
+									/*}}}*/
+static bool handleOnTheFlyReconfiguration(std::ostream &log, int const client,/*{{{*/
+      std::string const &request, std::vector const &EncodedParts, std::list &headers)
+{
+   size_t const pcount = EncodedParts.size();
+   std::vector parts(pcount);
+   for (size_t i = 0; i < pcount; ++i)
+      parts[i] = DeQuoteString(EncodedParts[i]);
+   if (pcount == 4 && parts[1] == "set")
+   {
+      _config->Set(parts[2], parts[3]);
+      sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
+      return true;
+   }
+   else if (pcount == 4 && parts[1] == "find")
+   {
+      std::string response = _config->Find(parts[2], parts[3]);
+      addDataHeaders(headers, response);
+      if (contentTypeSet(headers) == false)
+	 headers.push_back("Content-Type: text/plain; charset=utf-8");
+      sendHead(log, client, 200, headers);
+      sendData(client, headers, response);
+      return true;
+   }
+   else if (pcount == 3 && parts[1] == "find")
+   {
+      if (_config->Exists(parts[2]) == true)
+      {
+	 std::string response = _config->Find(parts[2]);
+	 addDataHeaders(headers, response);
+	 if (contentTypeSet(headers) == false)
+	    headers.push_back("Content-Type: text/plain; charset=utf-8");
+	 sendHead(log, client, 200, headers);
+	 sendData(client, headers, response);
+	 return true;
+      }
+      sendError(log, client, 404, request, true, "Requested Configuration option doesn't exist", headers);
+      return false;
+   }
+   else if (pcount == 3 && parts[1] == "clear")
+   {
+      _config->Clear(parts[2]);
+      sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
+      return true;
+   }
+
+   sendError(log, client, 400, request, true, "Unknown on-the-fly configuration request", headers);
+   return false;
+}
+									/*}}}*/
+static void * handleClient(int const client, size_t const id)		/*{{{*/
+{
+   auto logfilepath = _config->FindFile("aptwebserver::logfiles");
+   if (logfilepath.empty() == false)
+      strprintf(logfilepath, "%s.client-%lu.log", logfilepath.c_str(), id);
+   else
+      logfilepath = "/dev/null";
+   std::ofstream logfile(logfilepath);
+   basic_teeostream log(std::clog, logfile);
+
+   log << "ACCEPT client " << client << std::endl;
+   bool closeConnection = false;
+   while (closeConnection == false)
+   {
+      std::vector messages;
+      if (ReadMessages(client, messages) == false)
+	 break;
+
+      std::list headers;
+      for (std::vector::const_iterator m = messages.begin();
+	    m != messages.end() && closeConnection == false; ++m) {
+	 // if we announced a closing in previous response, do the close now
+	 if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
+	 {
+	    closeConnection = true;
+	    break;
+	 }
+	 headers.clear();
+
+	 log << ">>> REQUEST from " << client << " >>>" << std::endl << *m
+	    << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
+	 std::string filename;
+	 std::string params;
+	 bool sendContent = true;
+	 if (parseFirstLine(log, client, *m, filename, params, sendContent, closeConnection, headers) == false)
+	    continue;
+
+	 // special webserver command request
+	 if (filename.length() > 1 && filename[0] == '_')
+	 {
+	    auto const parts = VectorizeString(filename, '/');
+	    if (parts[0] == "_config")
+	    {
+	       handleOnTheFlyReconfiguration(log, client, *m, parts, headers);
+	       continue;
+	    }
+	 }
+
+	 // string replacements in the requested filename
+	 ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
+	 if (Replaces != NULL)
+	 {
+	    std::string redirect = "/" + filename;
+	    for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
+	       redirect = SubstVar(redirect, I->Tag, I->Value);
+	    if (redirect.empty() == false && redirect[0] == '/')
+	       redirect.erase(0,1);
+	    if (redirect != filename)
+	    {
+	       sendRedirect(log, client, _config->FindI("aptwebserver::redirect::httpcode", 301), redirect, *m, sendContent);
+	       continue;
+	    }
+	 }
+
+	 ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
+	 if (Overwrite != NULL)
+	 {
+	    for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
+	    {
+	       regex_t *pattern = new regex_t;
+	       int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
+	       if (res != 0)
+	       {
+		  char error[300];
+		  regerror(res, pattern, error, sizeof(error));
+		  sendError(log, client, 500, *m, sendContent, error, headers);
+		  continue;
+	       }
+	       if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
+	       {
+		  filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", flNotDir(filename));
+		  if (filename.find("/") == std::string::npos)
+		  {
+		     auto directory = _config->Find("aptwebserver::overwrite::" + I->Tag + "::directory", flNotFile(filename));
+		     filename = flCombine(directory, filename);
+		  }
+		  if (filename.empty() == false && filename[0] == '/')
+		     filename.erase(0,1);
+		  if (filename.empty())
+		     filename = "./";
+		  regfree(pattern);
+		  break;
+	       }
+	       regfree(pattern);
+	    }
+	 }
+
+	 // automatic retry can be tested with this
+	 {
+	    int failrequests = _config->FindI("aptwebserver::failrequest::" + filename, 0);
+	    if (failrequests != 0)
+	    {
+	       --failrequests;
+	       _config->Set(("aptwebserver::failrequest::" + filename).c_str(), failrequests);
+	       sendError(log, client, _config->FindI("aptwebserver::failrequest", 400), *m, sendContent, "Server is configured to fail this file.", headers);
+	       continue;
+	    }
+	 }
+
+	 // deal with the request
+	 unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
+	 std::string hosthttpsport;
+	 strprintf(hosthttpsport, ":%u", httpsport);
+	 if (_config->FindB("aptwebserver::support::http", true) == false &&
+	       LookupTag(*m, "Host").find(hosthttpsport) == std::string::npos)
+	 {
+	    sendError(log, client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
+	    continue;
+	 }
+	 else if (RealFileExists(filename) == true)
+	 {
+	    FileFd data(filename, FileFd::ReadOnly);
+	    std::string condition = LookupTag(*m, "If-Modified-Since", "");
+	    if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
+	    {
+	       time_t cache;
+	       if (RFC1123StrToTime(condition, cache) == true &&
+		     cache >= data.ModificationTime())
+	       {
+		  sendHead(log, client, 304, headers);
+		  continue;
+	       }
+	    }
+
+	    if (_config->FindB("aptwebserver::support::range", true) == true)
+	       condition = LookupTag(*m, "Range", "");
+	    else
+	       condition.clear();
+	    if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
+	    {
+	       std::string ranges = ',' + _config->Find("aptwebserver::response-header::Accept-Ranges") + ',';
+	       ranges.erase(std::remove(ranges.begin(), ranges.end(), ' '), ranges.end());
+	       if (ranges.find(",bytes,") == std::string::npos)
+	       {
+		  // we handle it as an error here because we are a test server - a real one should just ignore it
+		  sendError(log, client, 400, *m, sendContent, "Client does range requests we don't support", headers);
+		  continue;
+	       }
+
+	       time_t cache;
+	       std::string ifrange;
+	       if (_config->FindB("aptwebserver::support::if-range", true) == true)
+		  ifrange = LookupTag(*m, "If-Range", "");
+	       bool validrange = (ifrange.empty() == true ||
+		     (RFC1123StrToTime(ifrange, cache) == true &&
+		      cache <= data.ModificationTime()));
+
+	       // FIXME: support multiple byte-ranges (APT clients do not do this)
+	       if (condition.find(',') == std::string::npos)
+	       {
+		  size_t start = 6;
+		  unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
+		  // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
+		  size_t dash = condition.find('-') + 1;
+		  unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
+		  unsigned long long filesize = data.FileSize();
+		  if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
+			validrange == true)
+		  {
+		     if (filesize > filestart)
+		     {
+			data.Skip(filestart);
+                        // make sure to send content-range before conent-length
+                        // as regression test for LP: #1445239
+			std::ostringstream contentrange;
+			contentrange << "Content-Range: bytes " << filestart << "-"
+			   << filesize - 1 << "/" << filesize;
+			headers.push_back(contentrange.str());
+			std::ostringstream contentlength;
+			contentlength << "Content-Length: " << (filesize - filestart);
+			headers.push_back(contentlength.str());
+			sendHead(log, client, 206, headers);
+			if (sendContent == true)
+			   sendFile(client, headers, data);
+			continue;
+		     }
+		     else
+		     {
+			if (_config->FindB("aptwebserver::support::content-range", true) == true)
+			{
+			   std::ostringstream contentrange;
+			   contentrange << "Content-Range: bytes */" << filesize;
+			   headers.push_back(contentrange.str());
+			}
+			sendError(log, client, 416, *m, sendContent, "", headers);
+			continue;
+		     }
+		  }
+	       }
+	    }
+
+	    addFileHeaders(headers, data);
+	    sendHead(log, client, 200, headers);
+	    if (sendContent == true)
+	       sendFile(client, headers, data);
+	 }
+	 else if (DirectoryExists(filename) == true)
+	 {
+	    if (filename[filename.length()-1] == '/')
+	       sendDirectoryListing(log, client, filename, *m, sendContent, headers);
+	    else
+	       sendRedirect(log, client, 301, filename.append("/"), *m, sendContent);
+	 }
+	 else
+	    sendError(log, client, 404, *m, sendContent, "", headers);
+      }
+
+      // if we announced a closing in the last response, do the close now
+      if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
+	 closeConnection = true;
+
+      if (_error->PendingError() == true)
+	 break;
+      _error->DumpErrors(std::cerr);
+   }
+   _error->DumpErrors(std::cerr);
+   close(client);
+   log << "CLOSE client " << client << std::endl;
+   return NULL;
+}
+									/*}}}*/
+static void loadMimeTypesFile(std::string const &filename)		/*{{{*/
+{
+   if (FileExists(filename) == false)
+      return;
+
+   std::string line;
+   FileFd mimetypes(filename, FileFd::ReadOnly);
+   while (mimetypes.ReadLine(line))
+   {
+      if (line.empty() || line[0] == '#' || line.find_first_not_of(" \t\r") == std::string::npos)
+	 continue;
+      std::transform(line.begin(), line.end(), line.begin(), [](char const c) { return c == ' ' ? '\t' : c; });
+      auto l = VectorizeString(line, '\t');
+      l.erase(std::remove_if(l.begin(), l.end(), [](std::string const &f) { return f.empty(); }), l.end());
+      if (l.size() < 2)
+	 continue;
+      for (size_t i = 1; i < l.size(); ++i)
+	 if (l[i].empty() == false)
+	    _config->CndSet(std::string("aptwebserver::content-type::by-extension::").append(l[i]).c_str(), l[0]);
+   }
+}
+									/*}}}*/
+
+int main(int const argc, const char * argv[])
+{
+   CommandLine::Args Args[] = {
+      {'p', "port", "aptwebserver::port", CommandLine::HasArg},
+      {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
+      {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
+      {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
+      {0, "logfiles", "aptwebserver::logfiles", CommandLine::HasArg},
+      {'c',"config-file",0,CommandLine::ConfigFile},
+      {'o',"option",0,CommandLine::ArbItem},
+      {0,0,0,0}
+   };
+
+   CommandLine CmdL(Args, _config);
+   if(CmdL.Parse(argc,argv) == false)
+   {
+      _error->DumpErrors();
+      exit(1);
+   }
+
+   if (_config->FindB("aptwebserver::content-type::mime.types", true))
+   {
+      if (_config->FindB("aptwebserver::content-type::mime.types::apt", true))
+	 loadMimeTypesFile("/etc/apt/mime.types");
+
+      if (_config->FindB("aptwebserver::content-type::mime.types::home", true))
+      {
+	 auto const home = getenv("HOME");
+	 if (home != nullptr)
+	    loadMimeTypesFile(flCombine(home, ".mime.types"));
+      }
+
+      if (_config->FindB("aptwebserver::content-type::mime.types::etc", true))
+	 loadMimeTypesFile("/etc/mime.types");
+   }
+
+   // create socket, bind and listen to it {{{
+   // ignore SIGPIPE, this can happen on write() if the socket closes connection
+   signal(SIGPIPE, SIG_IGN);
+   // ignore worker processes exiting, as we don't want to cause them to stay
+   // around as zombies because we're busy.
+   signal(SIGCHLD, SIG_IGN);
+
+   int sock = socket(AF_INET6, SOCK_STREAM, 0);
+   if(sock < 0)
+   {
+      _error->Errno("aptwerbserver", "Couldn't create socket");
+      _error->DumpErrors(std::cerr);
+      return 1;
+   }
+
+   int port = _config->FindI("aptwebserver::port", 8080);
+
+   // ensure that we accept all connections: v4 or v6
+   int const iponly = 0;
+   setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
+   // to not linger on an address
+   int const enable = 1;
+   setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
+
+   struct sockaddr_in6 locAddr;
+   memset(&locAddr, 0, sizeof(locAddr));
+   locAddr.sin6_family = AF_INET6;
+   locAddr.sin6_port = htons(port);
+   locAddr.sin6_addr = in6addr_any;
+
+   if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
+   {
+      _error->Errno("aptwerbserver", "Couldn't bind");
+      _error->DumpErrors(std::cerr);
+      return 2;
+   }
+
+   if (port == 0)
+   {
+      struct sockaddr_in6 addr;
+      socklen_t addrlen = sizeof(sockaddr_in6);
+      if (getsockname(sock, (struct sockaddr*) &addr, &addrlen) != 0)
+	 _error->Errno("getsockname", "Could not get chosen port number");
+      else
+	 port = ntohs(addr.sin6_port);
+   }
+   std::string const portfilename = _config->Find("aptwebserver::portfile", "");
+   if (portfilename.empty() == false)
+   {
+      FileFd portfile(portfilename, FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
+      std::string portcontent;
+      strprintf(portcontent, "%d", port);
+      portfile.Write(portcontent.c_str(), portcontent.size());
+      portfile.Sync();
+   }
+   _config->Set("aptwebserver::port::http", port);
+
+   FileFd pidfile;
+   if (_config->FindB("aptwebserver::fork", false) == true)
+   {
+      std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
+      int const pidfilefd = GetLock(pidfilename);
+      if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
+      {
+	 _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
+	 _error->DumpErrors(std::cerr);
+	 return 3;
+      }
+
+      pid_t child = fork();
+      if (child < 0)
+      {
+	 _error->Errno("aptwebserver", "Forking failed");
+	 _error->DumpErrors(std::cerr);
+	 return 4;
+      }
+      else if (child != 0)
+      {
+	 // successfully forked: ready to serve!
+	 std::string pidcontent;
+	 strprintf(pidcontent, "%d", child);
+	 pidfile.Write(pidcontent.c_str(), pidcontent.size());
+	 pidfile.Sync();
+	 if (_error->PendingError() == true)
+	 {
+	    _error->DumpErrors(std::cerr);
+	    return 5;
+	 }
+	 std::cout << "Successfully forked as " << child << std::endl;
+	 return 0;
+      }
+   }
+
+   std::clog << "Serving ANY file on port: " << port << std::endl;
+
+   int const workers = _config->FindI("aptwebserver::workers", SOMAXCONN);
+   std::cerr << "WORKERS: " << workers << std::endl;
+   listen(sock, workers);
+   /*}}}*/
+
+   _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
+   _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
+   _config->CndSet("aptwebserver::directoryindex", "index.html");
+   APT::Configuration::getCompressors();
+
+   size_t id = 0;
+   while (true)
+   {
+      int client = accept(sock, NULL, NULL);
+      if (client == -1)
+      {
+	 if (errno == EINTR)
+	    continue;
+	 _error->Errno("accept", "Couldn't accept client on socket %d", sock);
+	 _error->DumpErrors(std::cerr);
+	 return 6;
+      }
+
+      std::thread t(handleClient, client, ++id);
+      t.detach();
+   }
+   pidfile.Close();
+
+   return 0;
+}
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