test/interactive-helper/aptwebserver.cc

   1 #include <config.h>
   2
   3 #include <apt-pkg/cmndline.h>
   4 #include <apt-pkg/configuration.h>
   5 #include <apt-pkg/error.h>
   6 #include <apt-pkg/fileutl.h>
   7 #include <apt-pkg/strutl.h>
   8
   9 #include <dirent.h>
  10 #include <errno.h>
  11 #include <netinet/in.h>
  12 #include <pthread.h>
  13 #include <regex.h>
  14 #include <signal.h>
  15 #include <stddef.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/socket.h>
  19 #include <sys/stat.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <iostream>
  23 #include <sstream>
  24 #include <list>
  25 #include <string>
  26 #include <vector>
  27
  28 static char const * httpcodeToStr(int const httpcode)           /*{{{*/
  29 {
  30    switch (httpcode)
  31    {
  32       // Informational 1xx
  33       case 100: return "100 Continue";
  34       case 101: return "101 Switching Protocols";
  35       // Successful 2xx
  36       case 200: return "200 OK";
  37       case 201: return "201 Created";
  38       case 202: return "202 Accepted";
  39       case 203: return "203 Non-Authoritative Information";
  40       case 204: return "204 No Content";
  41       case 205: return "205 Reset Content";
  42       case 206: return "206 Partial Content";
  43       // Redirections 3xx
  44       case 300: return "300 Multiple Choices";
  45       case 301: return "301 Moved Permanently";
  46       case 302: return "302 Found";
  47       case 303: return "303 See Other";
  48       case 304: return "304 Not Modified";
  49       case 305: return "304 Use Proxy";
  50       case 307: return "307 Temporary Redirect";
  51       // Client errors 4xx
  52       case 400: return "400 Bad Request";
  53       case 401: return "401 Unauthorized";
  54       case 402: return "402 Payment Required";
  55       case 403: return "403 Forbidden";
  56       case 404: return "404 Not Found";
  57       case 405: return "405 Method Not Allowed";
  58       case 406: return "406 Not Acceptable";
  59       case 407: return "407 Proxy Authentication Required";
  60       case 408: return "408 Request Time-out";
  61       case 409: return "409 Conflict";
  62       case 410: return "410 Gone";
  63       case 411: return "411 Length Required";
  64       case 412: return "412 Precondition Failed";
  65       case 413: return "413 Request Entity Too Large";
  66       case 414: return "414 Request-URI Too Large";
  67       case 415: return "415 Unsupported Media Type";
  68       case 416: return "416 Requested range not satisfiable";
  69       case 417: return "417 Expectation Failed";
  70       case 418: return "418 I'm a teapot";
  71       // Server error 5xx
  72       case 500: return "500 Internal Server Error";
  73       case 501: return "501 Not Implemented";
  74       case 502: return "502 Bad Gateway";
  75       case 503: return "503 Service Unavailable";
  76       case 504: return "504 Gateway Time-out";
  77       case 505: return "505 HTTP Version not supported";
  78    }
  79    return NULL;
  80 }
  81                                                                         /*}}}*/
  82 static void addFileHeaders(std::list<std::string> &headers, FileFd &data)/*{{{*/
  83 {
  84    std::ostringstream contentlength;
  85    contentlength << "Content-Length: " << data.FileSize();
  86    headers.push_back(contentlength.str());
  87
  88    std::string lastmodified("Last-Modified: ");
  89    lastmodified.append(TimeRFC1123(data.ModificationTime()));
  90    headers.push_back(lastmodified);
  91 }
  92                                                                         /*}}}*/
  93 static void addDataHeaders(std::list<std::string> &headers, std::string &data)/*{{{*/
  94 {
  95    std::ostringstream contentlength;
  96    contentlength << "Content-Length: " << data.size();
  97    headers.push_back(contentlength.str());
  98 }
  99                                                                         /*}}}*/
 100 static bool sendHead(int const client, int const httpcode, std::list<std::string> &headers)/*{{{*/
 101 {
 102    std::string response("HTTP/1.1 ");
 103    response.append(httpcodeToStr(httpcode));
 104    headers.push_front(response);
 105    _config->Set("APTWebserver::Last-Status-Code", httpcode);
 106
 107    std::stringstream buffer;
 108    _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
 109    std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
 110    for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
 111       headers.push_back(*h);
 112
 113    std::string date("Date: ");
 114    date.append(TimeRFC1123(time(NULL)));
 115    headers.push_back(date);
 116
 117    std::clog << ">>> RESPONSE to " << client << " >>>" << std::endl;
 118    bool Success = true;
 119    for (std::list<std::string>::const_iterator h = headers.begin();
 120         Success == true && h != headers.end(); ++h)
 121    {
 122       Success &= FileFd::Write(client, h->c_str(), h->size());
 123       if (Success == true)
 124          Success &= FileFd::Write(client, "\r\n", 2);
 125       std::clog << *h << std::endl;
 126    }
 127    if (Success == true)
 128       Success &= FileFd::Write(client, "\r\n", 2);
 129    std::clog << "<<<<<<<<<<<<<<<<" << std::endl;
 130    return Success;
 131 }
 132                                                                         /*}}}*/
 133 static bool sendFile(int const client, FileFd &data)                    /*{{{*/
 134 {
 135    bool Success = true;
 136    char buffer[500];
 137    unsigned long long actual = 0;
 138    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
 139    {
 140       if (actual == 0)
 141          break;
 142       Success &= FileFd::Write(client, buffer, actual);
 143    }
 144    if (Success == false)
 145       std::cerr << "SENDFILE: READ/WRITE ERROR to " << client << std::endl;
 146    return Success;
 147 }
 148                                                                         /*}}}*/
 149 static bool sendData(int const client, std::string const &data)         /*{{{*/
 150 {
 151    if (FileFd::Write(client, data.c_str(), data.size()) == false)
 152    {
 153       std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
 154       return false;
 155    }
 156    return true;
 157 }
 158                                                                         /*}}}*/
 159 static void sendError(int const client, int const httpcode, std::string const &request,/*{{{*/
 160                bool content, std::string const &error = "", std::list<std::string> headers = std::list<std::string>())
 161 {
 162    std::string response("<html><head><title>");
 163    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 164    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 165    if (httpcode != 200)
 166    {
 167       if (error.empty() == false)
 168          response.append("<p><em>Error</em>: ").append(error).append("</p>");
 169       response.append("This error is a result of the request: <pre>");
 170    }
 171    else
 172    {
 173       if (error.empty() == false)
 174          response.append("<p><em>Success</em>: ").append(error).append("</p>");
 175       response.append("The successfully executed operation was requested by: <pre>");
 176    }
 177    response.append(request).append("</pre></body></html>");
 178    addDataHeaders(headers, response);
 179    sendHead(client, httpcode, headers);
 180    if (content == true)
 181       sendData(client, response);
 182 }
 183 static void sendSuccess(int const client, std::string const &request,
 184                bool content, std::string const &error = "")
 185 {
 186    sendError(client, 200, request, content, error);
 187 }
 188                                                                         /*}}}*/
 189 static void sendRedirect(int const client, int const httpcode, std::string const &uri,/*{{{*/
 190                   std::string const &request, bool content)
 191 {
 192    std::list<std::string> headers;
 193    std::string response("<html><head><title>");
 194    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 195    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 196    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 197    response.append("This page is a result of the request: <pre>");
 198    response.append(request).append("</pre></body></html>");
 199    addDataHeaders(headers, response);
 200    std::string location("Location: ");
 201    if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
 202    {
 203       std::string const host = LookupTag(request, "Host");
 204       if (host.find(":4433") != std::string::npos)
 205          location.append("https://");
 206       else
 207          location.append("http://");
 208       location.append(host).append("/");
 209       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 210       {
 211          std::string homeuri = SubstVar(uri, "/home/", "~");
 212          homeuri = SubstVar(homeuri, "/public_html/", "/");
 213          location.append(homeuri);
 214       }
 215       else
 216          location.append(uri);
 217    }
 218    else
 219       location.append(uri);
 220    headers.push_back(location);
 221    sendHead(client, httpcode, headers);
 222    if (content == true)
 223       sendData(client, response);
 224 }
 225                                                                         /*}}}*/
 226 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 227 {
 228    if (a->d_name[0] == '.')
 229       return 0;
 230 #ifdef _DIRENT_HAVE_D_TYPE
 231    // if we have the d_type check that only files and dirs will be included
 232    if (a->d_type != DT_UNKNOWN &&
 233        a->d_type != DT_REG &&
 234        a->d_type != DT_LNK && // this includes links to regular files
 235        a->d_type != DT_DIR)
 236       return 0;
 237 #endif
 238    return 1;
 239 }
 240 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 241 #ifdef _DIRENT_HAVE_D_TYPE
 242    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 243    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 244       return -1;
 245    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 246       return 1;
 247    else
 248 #endif
 249    {
 250       struct stat f_prop; //File's property
 251       stat((*a)->d_name, &f_prop);
 252       int const amode = f_prop.st_mode;
 253       stat((*b)->d_name, &f_prop);
 254       int const bmode = f_prop.st_mode;
 255       if (S_ISDIR(amode) && S_ISDIR(bmode));
 256       else if (S_ISDIR(amode))
 257          return -1;
 258       else if (S_ISDIR(bmode))
 259          return 1;
 260    }
 261    return strcasecmp((*a)->d_name, (*b)->d_name);
 262 }
 263                                                                         /*}}}*/
 264 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 265                           std::string const &request, bool content)
 266 {
 267    std::list<std::string> headers;
 268    std::ostringstream listing;
 269
 270    struct dirent **namelist;
 271    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 272    if (counter == -1)
 273    {
 274       sendError(client, 500, request, content);
 275       return;
 276    }
 277
 278    listing << "<html><head><title>Index of " << dir << "</title>"
 279            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 280            << "tr:nth-child(even){background-color:#dfdfdf;}"
 281            << "h1, td:nth-child(3){text-align:center;}"
 282            << "table {margin-left:auto;margin-right:auto;} --></style>"
 283            << "</head>" << std::endl
 284            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 285            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 286    if (dir != "./")
 287       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 288    for (int i = 0; i < counter; ++i) {
 289       struct stat fs;
 290       std::string filename(dir);
 291       filename.append("/").append(namelist[i]->d_name);
 292       stat(filename.c_str(), &fs);
 293       if (S_ISDIR(fs.st_mode))
 294       {
 295          listing << "<tr><td>d</td>"
 296                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 297                  << "<td>-</td>";
 298       }
 299       else
 300       {
 301          listing << "<tr><td>f</td>"
 302                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 303                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 304       }
 305       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 306    }
 307    listing << "</table></body></html>" << std::endl;
 308
 309    std::string response(listing.str());
 310    addDataHeaders(headers, response);
 311    sendHead(client, 200, headers);
 312    if (content == true)
 313       sendData(client, response);
 314 }
 315                                                                         /*}}}*/
 316 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 317                     std::string &filename, std::string &params, bool &sendContent,
 318                     bool &closeConnection)
 319 {
 320    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 321       sendContent = false;
 322    if (strncmp(request.c_str(), "GET ", 4) != 0)
 323    {
 324       sendError(client, 501, request, true);
 325       return false;
 326    }
 327
 328    size_t const lineend = request.find('\n');
 329    size_t filestart = request.find(' ');
 330    for (; request[filestart] == ' '; ++filestart);
 331    size_t fileend = request.rfind(' ', lineend);
 332    if (lineend == std::string::npos || filestart == std::string::npos ||
 333          fileend == std::string::npos || filestart == fileend)
 334    {
 335       sendError(client, 500, request, sendContent, "Filename can't be extracted");
 336       return false;
 337    }
 338
 339    size_t httpstart = fileend;
 340    for (; request[httpstart] == ' '; ++httpstart);
 341    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 342       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 343    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 344       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 345    else
 346    {
 347       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request");
 348       return false;
 349    }
 350
 351    filename = request.substr(filestart, fileend - filestart);
 352    if (filename.find(' ') != std::string::npos)
 353    {
 354       sendError(client, 500, request, sendContent, "Filename contains an unencoded space");
 355       return false;
 356    }
 357
 358    std::string host = LookupTag(request, "Host", "");
 359    if (host.empty() == true)
 360    {
 361       // RFC 2616 §14.23 requires Host
 362       sendError(client, 400, request, sendContent, "Host header is required");
 363       return false;
 364    }
 365    host = "http://" + host;
 366
 367    // Proxies require absolute uris, so this is a simple proxy-fake option
 368    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 369    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
 370    {
 371       if (absolute.find("uri") == std::string::npos)
 372       {
 373          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that");
 374          return false;
 375       }
 376
 377       // strip the host from the request to make it an absolute path
 378       filename.erase(0, host.length());
 379
 380       std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
 381       std::string auth = LookupTag(request, "Proxy-Authorization", "");
 382       if (authConf.empty() != auth.empty())
 383       {
 384          if (auth.empty())
 385             sendError(client, 407, request, sendContent, "Proxy requires authentication");
 386          else
 387             sendError(client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it");
 388         return false;
 389       }
 390       if (authConf.empty() == false)
 391       {
 392          char const * const basic = "Basic ";
 393          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 394          {
 395             auth.erase(0, strlen(basic));
 396             if (auth != authConf)
 397             {
 398                sendError(client, 407, request, sendContent, "Proxy-Authentication doesn't match");
 399                return false;
 400             }
 401          }
 402          else
 403          {
 404             std::list<std::string> headers;
 405             headers.push_back("Proxy-Authenticate: Basic");
 406             sendError(client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
 407             return false;
 408          }
 409       }
 410    }
 411    else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
 412    {
 413       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that");
 414       return false;
 415    }
 416
 417    if (APT::String::Startswith(filename, "/_config/") == false)
 418    {
 419       std::string const authConf = _config->Find("aptwebserver::authorization", "");
 420       std::string auth = LookupTag(request, "Authorization", "");
 421       if (authConf.empty() != auth.empty())
 422       {
 423          if (auth.empty())
 424             sendError(client, 401, request, sendContent, "Server requires authentication");
 425          else
 426             sendError(client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it");
 427          return false;
 428       }
 429       if (authConf.empty() == false)
 430       {
 431          char const * const basic = "Basic ";
 432          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 433          {
 434             auth.erase(0, strlen(basic));
 435             if (auth != authConf)
 436             {
 437                sendError(client, 401, request, sendContent, "Authentication doesn't match");
 438                return false;
 439             }
 440          }
 441          else
 442          {
 443             std::list<std::string> headers;
 444             headers.push_back("WWW-Authenticate: Basic");
 445             sendError(client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
 446             return false;
 447          }
 448       }
 449    }
 450
 451    size_t paramspos = filename.find('?');
 452    if (paramspos != std::string::npos)
 453    {
 454       params = filename.substr(paramspos + 1);
 455       filename.erase(paramspos);
 456    }
 457
 458    filename = DeQuoteString(filename);
 459
 460    // this is not a secure server, but at least prevent the obvious …
 461    if (filename.empty() == true || filename[0] != '/' ||
 462        strncmp(filename.c_str(), "//", 2) == 0 ||
 463        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 464        filename.find("/../") != std::string::npos)
 465    {
 466       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)");
 467       return false;
 468    }
 469
 470    // nuke the first character which is a / as we assured above
 471    filename.erase(0, 1);
 472    if (filename.empty() == true)
 473       filename = "./";
 474    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 475    else if (filename[0] == '~')
 476    {
 477       // /home/user is actually not entirely correct, but good enough for now
 478       size_t dashpos = filename.find('/');
 479       if (dashpos != std::string::npos)
 480       {
 481          std::string home = filename.substr(1, filename.find('/') - 1);
 482          std::string pubhtml = filename.substr(filename.find('/') + 1);
 483          filename = "/home/" + home + "/public_html/" + pubhtml;
 484       }
 485       else
 486          filename = "/home/" + filename.substr(1) + "/public_html/";
 487    }
 488
 489    // if no filename is given, but a valid directory see if we can use an index or
 490    // have to resort to a autogenerated directory listing later on
 491    if (DirectoryExists(filename) == true)
 492    {
 493       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 494       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 495             RealFileExists(filename + directoryIndex) == true)
 496          filename += directoryIndex;
 497    }
 498
 499    return true;
 500 }
 501                                                                         /*}}}*/
 502 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request, std::vector<std::string> parts)/*{{{*/
 503 {
 504    size_t const pcount = parts.size();
 505    for (size_t i = 0; i < pcount; ++i)
 506       parts[i] = DeQuoteString(parts[i]);
 507    if (pcount == 4 && parts[1] == "set")
 508    {
 509       _config->Set(parts[2], parts[3]);
 510       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!");
 511       return true;
 512    }
 513    else if (pcount == 4 && parts[1] == "find")
 514    {
 515       std::list<std::string> headers;
 516       std::string response = _config->Find(parts[2], parts[3]);
 517       addDataHeaders(headers, response);
 518       sendHead(client, 200, headers);
 519       sendData(client, response);
 520       return true;
 521    }
 522    else if (pcount == 3 && parts[1] == "find")
 523    {
 524       std::list<std::string> headers;
 525       if (_config->Exists(parts[2]) == true)
 526       {
 527          std::string response = _config->Find(parts[2]);
 528          addDataHeaders(headers, response);
 529          sendHead(client, 200, headers);
 530          sendData(client, response);
 531          return true;
 532       }
 533       sendError(client, 404, request, "Requested Configuration option doesn't exist.");
 534       return false;
 535    }
 536    else if (pcount == 3 && parts[1] == "clear")
 537    {
 538       _config->Clear(parts[2]);
 539       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.");
 540       return true;
 541    }
 542
 543    sendError(client, 400, request, true, "Unknown on-the-fly configuration request");
 544    return false;
 545 }
 546                                                                         /*}}}*/
 547 static void * handleClient(void * voidclient)                           /*{{{*/
 548 {
 549    int client = *((int*)(voidclient));
 550    std::clog << "ACCEPT client " << client << std::endl;
 551    std::vector<std::string> messages;
 552    while (ReadMessages(client, messages))
 553    {
 554       bool closeConnection = false;
 555       for (std::vector<std::string>::const_iterator m = messages.begin();
 556             m != messages.end() && closeConnection == false; ++m) {
 557          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 558             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 559          std::list<std::string> headers;
 560          std::string filename;
 561          std::string params;
 562          bool sendContent = true;
 563          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection) == false)
 564             continue;
 565
 566          // special webserver command request
 567          if (filename.length() > 1 && filename[0] == '_')
 568          {
 569             std::vector<std::string> parts = VectorizeString(filename, '/');
 570             if (parts[0] == "_config")
 571             {
 572                handleOnTheFlyReconfiguration(client, *m, parts);
 573                continue;
 574             }
 575          }
 576
 577          // string replacements in the requested filename
 578          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 579          if (Replaces != NULL)
 580          {
 581             std::string redirect = "/" + filename;
 582             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 583                redirect = SubstVar(redirect, I->Tag, I->Value);
 584             if (redirect.empty() == false && redirect[0] == '/')
 585                redirect.erase(0,1);
 586             if (redirect != filename)
 587             {
 588                sendRedirect(client, 301, redirect, *m, sendContent);
 589                continue;
 590             }
 591          }
 592
 593          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 594          if (Overwrite != NULL)
 595          {
 596             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 597             {
 598                regex_t *pattern = new regex_t;
 599                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 600                if (res != 0)
 601                {
 602                   char error[300];
 603                   regerror(res, pattern, error, sizeof(error));
 604                   sendError(client, 500, *m, sendContent, error);
 605                   continue;
 606                }
 607                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 608                {
 609                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 610                   if (filename[0] == '/')
 611                      filename.erase(0,1);
 612                   regfree(pattern);
 613                   break;
 614                }
 615                regfree(pattern);
 616             }
 617          }
 618
 619          // deal with the request
 620          if (_config->FindB("aptwebserver::support::http", true) == false &&
 621                LookupTag(*m, "Host").find(":4433") == std::string::npos)
 622          {
 623             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS");
 624             continue;
 625          }
 626          else if (RealFileExists(filename) == true)
 627          {
 628             FileFd data(filename, FileFd::ReadOnly);
 629             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 630             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 631             {
 632                time_t cache;
 633                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 634                      cache >= data.ModificationTime())
 635                {
 636                   sendHead(client, 304, headers);
 637                   continue;
 638                }
 639             }
 640
 641             if (_config->FindB("aptwebserver::support::range", true) == true)
 642                condition = LookupTag(*m, "Range", "");
 643             else
 644                condition.clear();
 645             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 646             {
 647                time_t cache;
 648                std::string ifrange;
 649                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 650                   ifrange = LookupTag(*m, "If-Range", "");
 651                bool validrange = (ifrange.empty() == true ||
 652                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 653                       cache <= data.ModificationTime()));
 654
 655                // FIXME: support multiple byte-ranges (APT clients do not do this)
 656                if (condition.find(',') == std::string::npos)
 657                {
 658                   size_t start = 6;
 659                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 660                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 661                   size_t dash = condition.find('-') + 1;
 662                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 663                   unsigned long long filesize = data.FileSize();
 664                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 665                         validrange == true)
 666                   {
 667                      if (filesize > filestart)
 668                      {
 669                         data.Skip(filestart);
 670                         std::ostringstream contentlength;
 671                         contentlength << "Content-Length: " << (filesize - filestart);
 672                         headers.push_back(contentlength.str());
 673                         std::ostringstream contentrange;
 674                         contentrange << "Content-Range: bytes " << filestart << "-"
 675                            << filesize - 1 << "/" << filesize;
 676                         headers.push_back(contentrange.str());
 677                         sendHead(client, 206, headers);
 678                         if (sendContent == true)
 679                            sendFile(client, data);
 680                         continue;
 681                      }
 682                      else
 683                      {
 684                         headers.push_back("Content-Length: 0");
 685                         std::ostringstream contentrange;
 686                         contentrange << "Content-Range: bytes */" << filesize;
 687                         headers.push_back(contentrange.str());
 688                         sendHead(client, 416, headers);
 689                         continue;
 690                      }
 691                   }
 692                }
 693             }
 694
 695             addFileHeaders(headers, data);
 696             sendHead(client, 200, headers);
 697             if (sendContent == true)
 698                sendFile(client, data);
 699          }
 700          else if (DirectoryExists(filename) == true)
 701          {
 702             if (filename[filename.length()-1] == '/')
 703                sendDirectoryListing(client, filename, *m, sendContent);
 704             else
 705                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 706          }
 707          else
 708             sendError(client, 404, *m, sendContent);
 709       }
 710       _error->DumpErrors(std::cerr);
 711       messages.clear();
 712       if (closeConnection == true)
 713          break;
 714    }
 715    close(client);
 716    std::clog << "CLOSE client " << client << std::endl;
 717    return NULL;
 718 }
 719                                                                         /*}}}*/
 720
 721 int main(int const argc, const char * argv[])
 722 {
 723    CommandLine::Args Args[] = {
 724       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 725       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 726       {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
 727       {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
 728       {'c',"config-file",0,CommandLine::ConfigFile},
 729       {'o',"option",0,CommandLine::ArbItem},
 730       {0,0,0,0}
 731    };
 732
 733    CommandLine CmdL(Args, _config);
 734    if(CmdL.Parse(argc,argv) == false)
 735    {
 736       _error->DumpErrors();
 737       exit(1);
 738    }
 739
 740    // create socket, bind and listen to it {{{
 741    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 742    signal(SIGPIPE, SIG_IGN);
 743    // we don't care for our slaves, so ignore their death
 744    signal(SIGCHLD, SIG_IGN);
 745
 746    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 747    if(sock < 0)
 748    {
 749       _error->Errno("aptwerbserver", "Couldn't create socket");
 750       _error->DumpErrors(std::cerr);
 751       return 1;
 752    }
 753
 754    int const port = _config->FindI("aptwebserver::port", 8080);
 755
 756    // ensure that we accept all connections: v4 or v6
 757    int const iponly = 0;
 758    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 759    // to not linger on an address
 760    int const enable = 1;
 761    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 762
 763    struct sockaddr_in6 locAddr;
 764    memset(&locAddr, 0, sizeof(locAddr));
 765    locAddr.sin6_family = AF_INET6;
 766    locAddr.sin6_port = htons(port);
 767    locAddr.sin6_addr = in6addr_any;
 768
 769    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 770    {
 771       _error->Errno("aptwerbserver", "Couldn't bind");
 772       _error->DumpErrors(std::cerr);
 773       return 2;
 774    }
 775
 776    FileFd pidfile;
 777    if (_config->FindB("aptwebserver::fork", false) == true)
 778    {
 779       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 780       int const pidfilefd = GetLock(pidfilename);
 781       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 782       {
 783          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 784          _error->DumpErrors(std::cerr);
 785          return 3;
 786       }
 787
 788       pid_t child = fork();
 789       if (child < 0)
 790       {
 791          _error->Errno("aptwebserver", "Forking failed");
 792          _error->DumpErrors(std::cerr);
 793          return 4;
 794       }
 795       else if (child != 0)
 796       {
 797          // successfully forked: ready to serve!
 798          std::string pidcontent;
 799          strprintf(pidcontent, "%d", child);
 800          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 801          if (_error->PendingError() == true)
 802          {
 803             _error->DumpErrors(std::cerr);
 804             return 5;
 805          }
 806          std::cout << "Successfully forked as " << child << std::endl;
 807          return 0;
 808       }
 809    }
 810
 811    std::clog << "Serving ANY file on port: " << port << std::endl;
 812
 813    int const slaves = _config->FindB("aptwebserver::slaves", SOMAXCONN);
 814    listen(sock, slaves);
 815    /*}}}*/
 816
 817    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 818    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 819    _config->CndSet("aptwebserver::directoryindex", "index.html");
 820
 821    std::list<int> accepted_clients;
 822
 823    while (true)
 824    {
 825       int client = accept(sock, NULL, NULL);
 826       if (client == -1)
 827       {
 828          if (errno == EINTR)
 829             continue;
 830          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 831          _error->DumpErrors(std::cerr);
 832          return 6;
 833       }
 834
 835       pthread_attr_t attr;
 836       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 837       {
 838          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 839          _error->DumpErrors(std::cerr);
 840          close(client);
 841          continue;
 842       }
 843
 844       pthread_t tid;
 845       // thats rather dirty, but we need to store the client socket somewhere safe
 846       accepted_clients.push_front(client);
 847       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 848       {
 849          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 850          _error->DumpErrors(std::cerr);
 851          close(client);
 852          continue;
 853       }
 854    }
 855    pidfile.Close();
 856
 857    return 0;
 858 }