test/interactive-helper/aptwebserver.cc

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