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 = "")
 161 {
 162    std::list<std::string> headers;
 163    std::string response("<html><head><title>");
 164    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 165    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 166    if (httpcode != 200)
 167    {
 168       if (error.empty() == false)
 169          response.append("<p><em>Error</em>: ").append(error).append("</p>");
 170       response.append("This error is a result of the request: <pre>");
 171    }
 172    else
 173    {
 174       if (error.empty() == false)
 175          response.append("<p><em>Success</em>: ").append(error).append("</p>");
 176       response.append("The successfully executed operation was requested by: <pre>");
 177    }
 178    response.append(request).append("</pre></body></html>");
 179    addDataHeaders(headers, response);
 180    sendHead(client, httpcode, headers);
 181    if (content == true)
 182       sendData(client, response);
 183 }
 184 static void sendSuccess(int const client, std::string const &request,
 185                bool content, std::string const &error = "")
 186 {
 187    sendError(client, 200, request, content, error);
 188 }
 189                                                                         /*}}}*/
 190 static void sendRedirect(int const client, int const httpcode, std::string const &uri,/*{{{*/
 191                   std::string const &request, bool content)
 192 {
 193    std::list<std::string> headers;
 194    std::string response("<html><head><title>");
 195    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 196    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 197    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 198    response.append("This page is a result of the request: <pre>");
 199    response.append(request).append("</pre></body></html>");
 200    addDataHeaders(headers, response);
 201    std::string location("Location: ");
 202    if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
 203    {
 204       std::string const host = LookupTag(request, "Host");
 205       if (host.find(":4433") != std::string::npos)
 206          location.append("https://");
 207       else
 208          location.append("http://");
 209       location.append(host).append("/");
 210       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 211       {
 212          std::string homeuri = SubstVar(uri, "/home/", "~");
 213          homeuri = SubstVar(homeuri, "/public_html/", "/");
 214          location.append(homeuri);
 215       }
 216       else
 217          location.append(uri);
 218    }
 219    else
 220       location.append(uri);
 221    headers.push_back(location);
 222    sendHead(client, httpcode, headers);
 223    if (content == true)
 224       sendData(client, response);
 225 }
 226                                                                         /*}}}*/
 227 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 228 {
 229    if (a->d_name[0] == '.')
 230       return 0;
 231 #ifdef _DIRENT_HAVE_D_TYPE
 232    // if we have the d_type check that only files and dirs will be included
 233    if (a->d_type != DT_UNKNOWN &&
 234        a->d_type != DT_REG &&
 235        a->d_type != DT_LNK && // this includes links to regular files
 236        a->d_type != DT_DIR)
 237       return 0;
 238 #endif
 239    return 1;
 240 }
 241 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 242 #ifdef _DIRENT_HAVE_D_TYPE
 243    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 244    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 245       return -1;
 246    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 247       return 1;
 248    else
 249 #endif
 250    {
 251       struct stat f_prop; //File's property
 252       stat((*a)->d_name, &f_prop);
 253       int const amode = f_prop.st_mode;
 254       stat((*b)->d_name, &f_prop);
 255       int const bmode = f_prop.st_mode;
 256       if (S_ISDIR(amode) && S_ISDIR(bmode));
 257       else if (S_ISDIR(amode))
 258          return -1;
 259       else if (S_ISDIR(bmode))
 260          return 1;
 261    }
 262    return strcasecmp((*a)->d_name, (*b)->d_name);
 263 }
 264                                                                         /*}}}*/
 265 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 266                           std::string const &request, bool content)
 267 {
 268    std::list<std::string> headers;
 269    std::ostringstream listing;
 270
 271    struct dirent **namelist;
 272    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 273    if (counter == -1)
 274    {
 275       sendError(client, 500, request, content);
 276       return;
 277    }
 278
 279    listing << "<html><head><title>Index of " << dir << "</title>"
 280            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 281            << "tr:nth-child(even){background-color:#dfdfdf;}"
 282            << "h1, td:nth-child(3){text-align:center;}"
 283            << "table {margin-left:auto;margin-right:auto;} --></style>"
 284            << "</head>" << std::endl
 285            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 286            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 287    if (dir != "./")
 288       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 289    for (int i = 0; i < counter; ++i) {
 290       struct stat fs;
 291       std::string filename(dir);
 292       filename.append("/").append(namelist[i]->d_name);
 293       stat(filename.c_str(), &fs);
 294       if (S_ISDIR(fs.st_mode))
 295       {
 296          listing << "<tr><td>d</td>"
 297                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 298                  << "<td>-</td>";
 299       }
 300       else
 301       {
 302          listing << "<tr><td>f</td>"
 303                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 304                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 305       }
 306       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 307    }
 308    listing << "</table></body></html>" << std::endl;
 309
 310    std::string response(listing.str());
 311    addDataHeaders(headers, response);
 312    sendHead(client, 200, headers);
 313    if (content == true)
 314       sendData(client, response);
 315 }
 316                                                                         /*}}}*/
 317 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 318                     std::string &filename, std::string &params, bool &sendContent,
 319                     bool &closeConnection)
 320 {
 321    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 322       sendContent = false;
 323    if (strncmp(request.c_str(), "GET ", 4) != 0)
 324    {
 325       sendError(client, 501, request, true);
 326       return false;
 327    }
 328
 329    size_t const lineend = request.find('\n');
 330    size_t filestart = request.find(' ');
 331    for (; request[filestart] == ' '; ++filestart);
 332    size_t fileend = request.rfind(' ', lineend);
 333    if (lineend == std::string::npos || filestart == std::string::npos ||
 334          fileend == std::string::npos || filestart == fileend)
 335    {
 336       sendError(client, 500, request, sendContent, "Filename can't be extracted");
 337       return false;
 338    }
 339
 340    size_t httpstart = fileend;
 341    for (; request[httpstart] == ' '; ++httpstart);
 342    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 343       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 344    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 345       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 346    else
 347    {
 348       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request");
 349       return false;
 350    }
 351
 352    filename = request.substr(filestart, fileend - filestart);
 353    if (filename.find(' ') != std::string::npos)
 354    {
 355       sendError(client, 500, request, sendContent, "Filename contains an unencoded space");
 356       return false;
 357    }
 358
 359    std::string host = LookupTag(request, "Host", "");
 360    if (host.empty() == true)
 361    {
 362       // RFC 2616 §14.23 requires Host
 363       sendError(client, 400, request, sendContent, "Host header is required");
 364       return false;
 365    }
 366    host = "http://" + host;
 367
 368    // Proxies require absolute uris, so this is a simple proxy-fake option
 369    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 370    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0)
 371    {
 372       if (absolute.find("uri") == std::string::npos)
 373       {
 374          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that");
 375          return false;
 376       }
 377       // strip the host from the request to make it an absolute path
 378       filename.erase(0, host.length());
 379    }
 380    else if (absolute.find("path") == std::string::npos)
 381    {
 382       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that");
 383       return false;
 384    }
 385
 386    size_t paramspos = filename.find('?');
 387    if (paramspos != std::string::npos)
 388    {
 389       params = filename.substr(paramspos + 1);
 390       filename.erase(paramspos);
 391    }
 392
 393    filename = DeQuoteString(filename);
 394
 395    // this is not a secure server, but at least prevent the obvious …
 396    if (filename.empty() == true || filename[0] != '/' ||
 397        strncmp(filename.c_str(), "//", 2) == 0 ||
 398        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 399        filename.find("/../") != std::string::npos)
 400    {
 401       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)");
 402       return false;
 403    }
 404
 405    // nuke the first character which is a / as we assured above
 406    filename.erase(0, 1);
 407    if (filename.empty() == true)
 408       filename = "./";
 409    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 410    else if (filename[0] == '~')
 411    {
 412       // /home/user is actually not entirely correct, but good enough for now
 413       size_t dashpos = filename.find('/');
 414       if (dashpos != std::string::npos)
 415       {
 416          std::string home = filename.substr(1, filename.find('/') - 1);
 417          std::string pubhtml = filename.substr(filename.find('/') + 1);
 418          filename = "/home/" + home + "/public_html/" + pubhtml;
 419       }
 420       else
 421          filename = "/home/" + filename.substr(1) + "/public_html/";
 422    }
 423
 424    // if no filename is given, but a valid directory see if we can use an index or
 425    // have to resort to a autogenerated directory listing later on
 426    if (DirectoryExists(filename) == true)
 427    {
 428       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 429       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 430             RealFileExists(filename + directoryIndex) == true)
 431          filename += directoryIndex;
 432    }
 433
 434    return true;
 435 }
 436                                                                         /*}}}*/
 437 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request, std::vector<std::string> const &parts)/*{{{*/
 438 {
 439    size_t const pcount = parts.size();
 440    if (pcount == 4 && parts[1] == "set")
 441    {
 442       _config->Set(parts[2], parts[3]);
 443       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!");
 444       return true;
 445    }
 446    else if (pcount == 4 && parts[1] == "find")
 447    {
 448       std::list<std::string> headers;
 449       std::string response = _config->Find(parts[2], parts[3]);
 450       addDataHeaders(headers, response);
 451       sendHead(client, 200, headers);
 452       sendData(client, response);
 453       return true;
 454    }
 455    else if (pcount == 3 && parts[1] == "find")
 456    {
 457       std::list<std::string> headers;
 458       if (_config->Exists(parts[2]) == true)
 459       {
 460          std::string response = _config->Find(parts[2]);
 461          addDataHeaders(headers, response);
 462          sendHead(client, 200, headers);
 463          sendData(client, response);
 464          return true;
 465       }
 466       sendError(client, 404, request, "Requested Configuration option doesn't exist.");
 467       return false;
 468    }
 469    else if (pcount == 3 && parts[1] == "clear")
 470    {
 471       _config->Clear(parts[2]);
 472       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.");
 473       return true;
 474    }
 475
 476    sendError(client, 400, request, true, "Unknown on-the-fly configuration request");
 477    return false;
 478 }
 479                                                                         /*}}}*/
 480 static void * handleClient(void * voidclient)                           /*{{{*/
 481 {
 482    int client = *((int*)(voidclient));
 483    std::clog << "ACCEPT client " << client << std::endl;
 484    std::vector<std::string> messages;
 485    while (ReadMessages(client, messages))
 486    {
 487       bool closeConnection = false;
 488       for (std::vector<std::string>::const_iterator m = messages.begin();
 489             m != messages.end() && closeConnection == false; ++m) {
 490          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 491             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 492          std::list<std::string> headers;
 493          std::string filename;
 494          std::string params;
 495          bool sendContent = true;
 496          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection) == false)
 497             continue;
 498
 499          // special webserver command request
 500          if (filename.length() > 1 && filename[0] == '_')
 501          {
 502             std::vector<std::string> parts = VectorizeString(filename, '/');
 503             if (parts[0] == "_config")
 504             {
 505                handleOnTheFlyReconfiguration(client, *m, parts);
 506                continue;
 507             }
 508          }
 509
 510          // string replacements in the requested filename
 511          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 512          if (Replaces != NULL)
 513          {
 514             std::string redirect = "/" + filename;
 515             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 516                redirect = SubstVar(redirect, I->Tag, I->Value);
 517             if (redirect.empty() == false && redirect[0] == '/')
 518                redirect.erase(0,1);
 519             if (redirect != filename)
 520             {
 521                sendRedirect(client, 301, redirect, *m, sendContent);
 522                continue;
 523             }
 524          }
 525
 526          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 527          if (Overwrite != NULL)
 528          {
 529             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 530             {
 531                regex_t *pattern = new regex_t;
 532                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 533                if (res != 0)
 534                {
 535                   char error[300];
 536                   regerror(res, pattern, error, sizeof(error));
 537                   sendError(client, 500, *m, sendContent, error);
 538                   continue;
 539                }
 540                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 541                {
 542                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 543                   if (filename[0] == '/')
 544                      filename.erase(0,1);
 545                   regfree(pattern);
 546                   break;
 547                }
 548                regfree(pattern);
 549             }
 550          }
 551
 552          // deal with the request
 553          if (_config->FindB("aptwebserver::support::http", true) == false &&
 554                LookupTag(*m, "Host").find(":4433") == std::string::npos)
 555          {
 556             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS");
 557             continue;
 558          }
 559          else if (RealFileExists(filename) == true)
 560          {
 561             FileFd data(filename, FileFd::ReadOnly);
 562             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 563             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 564             {
 565                time_t cache;
 566                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 567                      cache >= data.ModificationTime())
 568                {
 569                   sendHead(client, 304, headers);
 570                   continue;
 571                }
 572             }
 573
 574             if (_config->FindB("aptwebserver::support::range", true) == true)
 575                condition = LookupTag(*m, "Range", "");
 576             else
 577                condition.clear();
 578             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 579             {
 580                time_t cache;
 581                std::string ifrange;
 582                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 583                   ifrange = LookupTag(*m, "If-Range", "");
 584                bool validrange = (ifrange.empty() == true ||
 585                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 586                       cache <= data.ModificationTime()));
 587
 588                // FIXME: support multiple byte-ranges (APT clients do not do this)
 589                if (condition.find(',') == std::string::npos)
 590                {
 591                   size_t start = 6;
 592                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 593                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 594                   size_t dash = condition.find('-') + 1;
 595                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 596                   unsigned long long filesize = data.FileSize();
 597                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 598                         validrange == true)
 599                   {
 600                      if (filesize > filestart)
 601                      {
 602                         data.Skip(filestart);
 603                         std::ostringstream contentlength;
 604                         contentlength << "Content-Length: " << (filesize - filestart);
 605                         headers.push_back(contentlength.str());
 606                         std::ostringstream contentrange;
 607                         contentrange << "Content-Range: bytes " << filestart << "-"
 608                            << filesize - 1 << "/" << filesize;
 609                         headers.push_back(contentrange.str());
 610                         sendHead(client, 206, headers);
 611                         if (sendContent == true)
 612                            sendFile(client, data);
 613                         continue;
 614                      }
 615                      else
 616                      {
 617                         headers.push_back("Content-Length: 0");
 618                         std::ostringstream contentrange;
 619                         contentrange << "Content-Range: bytes */" << filesize;
 620                         headers.push_back(contentrange.str());
 621                         sendHead(client, 416, headers);
 622                         continue;
 623                      }
 624                   }
 625                }
 626             }
 627
 628             addFileHeaders(headers, data);
 629             sendHead(client, 200, headers);
 630             if (sendContent == true)
 631                sendFile(client, data);
 632          }
 633          else if (DirectoryExists(filename) == true)
 634          {
 635             if (filename[filename.length()-1] == '/')
 636                sendDirectoryListing(client, filename, *m, sendContent);
 637             else
 638                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 639          }
 640          else
 641             sendError(client, 404, *m, sendContent);
 642       }
 643       _error->DumpErrors(std::cerr);
 644       messages.clear();
 645       if (closeConnection == true)
 646          break;
 647    }
 648    close(client);
 649    std::clog << "CLOSE client " << client << std::endl;
 650    return NULL;
 651 }
 652                                                                         /*}}}*/
 653
 654 int main(int const argc, const char * argv[])
 655 {
 656    CommandLine::Args Args[] = {
 657       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 658       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 659       {'c',"config-file",0,CommandLine::ConfigFile},
 660       {'o',"option",0,CommandLine::ArbItem},
 661       {0,0,0,0}
 662    };
 663
 664    CommandLine CmdL(Args, _config);
 665    if(CmdL.Parse(argc,argv) == false)
 666    {
 667       _error->DumpErrors();
 668       exit(1);
 669    }
 670
 671    // create socket, bind and listen to it {{{
 672    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 673    signal(SIGPIPE, SIG_IGN);
 674    // we don't care for our slaves, so ignore their death
 675    signal(SIGCHLD, SIG_IGN);
 676
 677    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 678    if(sock < 0)
 679    {
 680       _error->Errno("aptwerbserver", "Couldn't create socket");
 681       _error->DumpErrors(std::cerr);
 682       return 1;
 683    }
 684
 685    int const port = _config->FindI("aptwebserver::port", 8080);
 686
 687    // ensure that we accept all connections: v4 or v6
 688    int const iponly = 0;
 689    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 690    // to not linger on an address
 691    int const enable = 1;
 692    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 693
 694    struct sockaddr_in6 locAddr;
 695    memset(&locAddr, 0, sizeof(locAddr));
 696    locAddr.sin6_family = AF_INET6;
 697    locAddr.sin6_port = htons(port);
 698    locAddr.sin6_addr = in6addr_any;
 699
 700    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 701    {
 702       _error->Errno("aptwerbserver", "Couldn't bind");
 703       _error->DumpErrors(std::cerr);
 704       return 2;
 705    }
 706
 707    FileFd pidfile;
 708    if (_config->FindB("aptwebserver::fork", false) == true)
 709    {
 710       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 711       int const pidfilefd = GetLock(pidfilename);
 712       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 713       {
 714          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 715          _error->DumpErrors(std::cerr);
 716          return 3;
 717       }
 718
 719       pid_t child = fork();
 720       if (child < 0)
 721       {
 722          _error->Errno("aptwebserver", "Forking failed");
 723          _error->DumpErrors(std::cerr);
 724          return 4;
 725       }
 726       else if (child != 0)
 727       {
 728          // successfully forked: ready to serve!
 729          std::string pidcontent;
 730          strprintf(pidcontent, "%d", child);
 731          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 732          if (_error->PendingError() == true)
 733          {
 734             _error->DumpErrors(std::cerr);
 735             return 5;
 736          }
 737          std::cout << "Successfully forked as " << child << std::endl;
 738          return 0;
 739       }
 740    }
 741
 742    std::clog << "Serving ANY file on port: " << port << std::endl;
 743
 744    int const slaves = _config->FindB("aptwebserver::slaves", SOMAXCONN);
 745    listen(sock, slaves);
 746    /*}}}*/
 747
 748    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 749    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 750    _config->CndSet("aptwebserver::directoryindex", "index.html");
 751
 752    std::list<int> accepted_clients;
 753
 754    while (true)
 755    {
 756       int client = accept(sock, NULL, NULL);
 757       if (client == -1)
 758       {
 759          if (errno == EINTR)
 760             continue;
 761          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 762          _error->DumpErrors(std::cerr);
 763          return 6;
 764       }
 765
 766       pthread_attr_t attr;
 767       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 768       {
 769          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 770          _error->DumpErrors(std::cerr);
 771          close(client);
 772          continue;
 773       }
 774
 775       pthread_t tid;
 776       // thats rather dirty, but we need to store the client socket somewhere safe
 777       accepted_clients.push_front(client);
 778       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 779       {
 780          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 781          _error->DumpErrors(std::cerr);
 782          close(client);
 783          continue;
 784       }
 785    }
 786    pidfile.Close();
 787
 788    return 0;
 789 }