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 static 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 static 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 static 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 static 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 to " << client << " >>>" << 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 static 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       Success &= FileFd::Write(client, buffer, actual);
 141    }
 142    if (Success == false)
 143       std::cerr << "SENDFILE: READ/WRITE ERROR to " << client << std::endl;
 144    return Success;
 145 }
 146                                                                         /*}}}*/
 147 static bool sendData(int const client, std::string const &data)         /*{{{*/
 148 {
 149    if (FileFd::Write(client, data.c_str(), data.size()) == false)
 150    {
 151       std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
 152       return false;
 153    }
 154    return true;
 155 }
 156                                                                         /*}}}*/
 157 static 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 static 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 static 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 && strncmp(uri.c_str(), "https://", 8) != 0)
 201    {
 202       std::string const host = LookupTag(request, "Host");
 203       if (host.find(":4433") != std::string::npos)
 204          location.append("https://");
 205       else
 206          location.append("http://");
 207       location.append(host).append("/");
 208       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 209       {
 210          std::string homeuri = SubstVar(uri, "/home/", "~");
 211          homeuri = SubstVar(homeuri, "/public_html/", "/");
 212          location.append(homeuri);
 213       }
 214       else
 215          location.append(uri);
 216    }
 217    else
 218       location.append(uri);
 219    headers.push_back(location);
 220    sendHead(client, httpcode, headers);
 221    if (content == true)
 222       sendData(client, response);
 223 }
 224                                                                         /*}}}*/
 225 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 226 {
 227    if (a->d_name[0] == '.')
 228       return 0;
 229 #ifdef _DIRENT_HAVE_D_TYPE
 230    // if we have the d_type check that only files and dirs will be included
 231    if (a->d_type != DT_UNKNOWN &&
 232        a->d_type != DT_REG &&
 233        a->d_type != DT_LNK && // this includes links to regular files
 234        a->d_type != DT_DIR)
 235       return 0;
 236 #endif
 237    return 1;
 238 }
 239 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 240 #ifdef _DIRENT_HAVE_D_TYPE
 241    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 242    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 243       return -1;
 244    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 245       return 1;
 246    else
 247 #endif
 248    {
 249       struct stat f_prop; //File's property
 250       stat((*a)->d_name, &f_prop);
 251       int const amode = f_prop.st_mode;
 252       stat((*b)->d_name, &f_prop);
 253       int const bmode = f_prop.st_mode;
 254       if (S_ISDIR(amode) && S_ISDIR(bmode));
 255       else if (S_ISDIR(amode))
 256          return -1;
 257       else if (S_ISDIR(bmode))
 258          return 1;
 259    }
 260    return strcasecmp((*a)->d_name, (*b)->d_name);
 261 }
 262                                                                         /*}}}*/
 263 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 264                           std::string const &request, bool content)
 265 {
 266    std::list<std::string> headers;
 267    std::ostringstream listing;
 268
 269    struct dirent **namelist;
 270    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 271    if (counter == -1)
 272    {
 273       sendError(client, 500, request, content);
 274       return;
 275    }
 276
 277    listing << "<html><head><title>Index of " << dir << "</title>"
 278            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 279            << "tr:nth-child(even){background-color:#dfdfdf;}"
 280            << "h1, td:nth-child(3){text-align:center;}"
 281            << "table {margin-left:auto;margin-right:auto;} --></style>"
 282            << "</head>" << std::endl
 283            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 284            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 285    if (dir != "./")
 286       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 287    for (int i = 0; i < counter; ++i) {
 288       struct stat fs;
 289       std::string filename(dir);
 290       filename.append("/").append(namelist[i]->d_name);
 291       stat(filename.c_str(), &fs);
 292       if (S_ISDIR(fs.st_mode))
 293       {
 294          listing << "<tr><td>d</td>"
 295                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 296                  << "<td>-</td>";
 297       }
 298       else
 299       {
 300          listing << "<tr><td>f</td>"
 301                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 302                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 303       }
 304       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 305    }
 306    listing << "</table></body></html>" << std::endl;
 307
 308    std::string response(listing.str());
 309    addDataHeaders(headers, response);
 310    sendHead(client, 200, headers);
 311    if (content == true)
 312       sendData(client, response);
 313 }
 314                                                                         /*}}}*/
 315 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 316                     std::string &filename, std::string &params, bool &sendContent,
 317                     bool &closeConnection)
 318 {
 319    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 320       sendContent = false;
 321    if (strncmp(request.c_str(), "GET ", 4) != 0)
 322    {
 323       sendError(client, 501, request, true);
 324       return false;
 325    }
 326
 327    size_t const lineend = request.find('\n');
 328    size_t filestart = request.find(' ');
 329    for (; request[filestart] == ' '; ++filestart);
 330    size_t fileend = request.rfind(' ', lineend);
 331    if (lineend == std::string::npos || filestart == std::string::npos ||
 332          fileend == std::string::npos || filestart == fileend)
 333    {
 334       sendError(client, 500, request, sendContent, "Filename can't be extracted");
 335       return false;
 336    }
 337
 338    size_t httpstart = fileend;
 339    for (; request[httpstart] == ' '; ++httpstart);
 340    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 341       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 342    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 343       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 344    else
 345    {
 346       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request");
 347       return false;
 348    }
 349
 350    filename = request.substr(filestart, fileend - filestart);
 351    if (filename.find(' ') != std::string::npos)
 352    {
 353       sendError(client, 500, request, sendContent, "Filename contains an unencoded space");
 354       return false;
 355    }
 356
 357    std::string host = LookupTag(request, "Host", "");
 358    if (host.empty() == true)
 359    {
 360       // RFC 2616 §14.23 requires Host
 361       sendError(client, 400, request, sendContent, "Host header is required");
 362       return false;
 363    }
 364    host = "http://" + host;
 365
 366    // Proxies require absolute uris, so this is a simple proxy-fake option
 367    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 368    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0)
 369    {
 370       if (absolute.find("uri") == std::string::npos)
 371       {
 372          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that");
 373          return false;
 374       }
 375       // strip the host from the request to make it an absolute path
 376       filename.erase(0, host.length());
 377    }
 378    else if (absolute.find("path") == std::string::npos)
 379    {
 380       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that");
 381       return false;
 382    }
 383
 384    size_t paramspos = filename.find('?');
 385    if (paramspos != std::string::npos)
 386    {
 387       params = filename.substr(paramspos + 1);
 388       filename.erase(paramspos);
 389    }
 390
 391    filename = DeQuoteString(filename);
 392
 393    // this is not a secure server, but at least prevent the obvious …
 394    if (filename.empty() == true || filename[0] != '/' ||
 395        strncmp(filename.c_str(), "//", 2) == 0 ||
 396        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 397        filename.find("/../") != std::string::npos)
 398    {
 399       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)");
 400       return false;
 401    }
 402
 403    // nuke the first character which is a / as we assured above
 404    filename.erase(0, 1);
 405    if (filename.empty() == true)
 406       filename = "./";
 407    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 408    else if (filename[0] == '~')
 409    {
 410       // /home/user is actually not entirely correct, but good enough for now
 411       size_t dashpos = filename.find('/');
 412       if (dashpos != std::string::npos)
 413       {
 414          std::string home = filename.substr(1, filename.find('/') - 1);
 415          std::string pubhtml = filename.substr(filename.find('/') + 1);
 416          filename = "/home/" + home + "/public_html/" + pubhtml;
 417       }
 418       else
 419          filename = "/home/" + filename.substr(1) + "/public_html/";
 420    }
 421
 422    // if no filename is given, but a valid directory see if we can use an index or
 423    // have to resort to a autogenerated directory listing later on
 424    if (DirectoryExists(filename) == true)
 425    {
 426       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 427       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 428             RealFileExists(filename + directoryIndex) == true)
 429          filename += directoryIndex;
 430    }
 431
 432    return true;
 433 }
 434                                                                         /*}}}*/
 435 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request, std::vector<std::string> const &parts)/*{{{*/
 436 {
 437    size_t const pcount = parts.size();
 438    if (pcount == 4 && parts[1] == "set")
 439    {
 440       _config->Set(parts[2], parts[3]);
 441       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!");
 442       return true;
 443    }
 444    else if (pcount == 4 && parts[1] == "find")
 445    {
 446       std::list<std::string> headers;
 447       std::string response = _config->Find(parts[2], parts[3]);
 448       addDataHeaders(headers, response);
 449       sendHead(client, 200, headers);
 450       sendData(client, response);
 451       return true;
 452    }
 453    else if (pcount == 3 && parts[1] == "find")
 454    {
 455       std::list<std::string> headers;
 456       if (_config->Exists(parts[2]) == true)
 457       {
 458          std::string response = _config->Find(parts[2]);
 459          addDataHeaders(headers, response);
 460          sendHead(client, 200, headers);
 461          sendData(client, response);
 462          return true;
 463       }
 464       sendError(client, 404, request, "Requested Configuration option doesn't exist.");
 465       return false;
 466    }
 467    else if (pcount == 3 && parts[1] == "clear")
 468    {
 469       _config->Clear(parts[2]);
 470       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.");
 471       return true;
 472    }
 473
 474    sendError(client, 400, request, true, "Unknown on-the-fly configuration request");
 475    return false;
 476 }
 477                                                                         /*}}}*/
 478 static void * handleClient(void * voidclient)                           /*{{{*/
 479 {
 480    int client = *((int*)(voidclient));
 481    std::clog << "ACCEPT client " << client << std::endl;
 482    std::vector<std::string> messages;
 483    while (ReadMessages(client, messages))
 484    {
 485       bool closeConnection = false;
 486       for (std::vector<std::string>::const_iterator m = messages.begin();
 487             m != messages.end() && closeConnection == false; ++m) {
 488          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 489             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 490          std::list<std::string> headers;
 491          std::string filename;
 492          std::string params;
 493          bool sendContent = true;
 494          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection) == false)
 495             continue;
 496
 497          // special webserver command request
 498          if (filename.length() > 1 && filename[0] == '_')
 499          {
 500             std::vector<std::string> parts = VectorizeString(filename, '/');
 501             if (parts[0] == "_config")
 502             {
 503                handleOnTheFlyReconfiguration(client, *m, parts);
 504                continue;
 505             }
 506          }
 507
 508          // string replacements in the requested filename
 509          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 510          if (Replaces != NULL)
 511          {
 512             std::string redirect = "/" + filename;
 513             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 514                redirect = SubstVar(redirect, I->Tag, I->Value);
 515             if (redirect.empty() == false && redirect[0] == '/')
 516                redirect.erase(0,1);
 517             if (redirect != filename)
 518             {
 519                sendRedirect(client, 301, redirect, *m, sendContent);
 520                continue;
 521             }
 522          }
 523
 524          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 525          if (Overwrite != NULL)
 526          {
 527             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 528             {
 529                regex_t *pattern = new regex_t;
 530                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 531                if (res != 0)
 532                {
 533                   char error[300];
 534                   regerror(res, pattern, error, sizeof(error));
 535                   sendError(client, 500, *m, sendContent, error);
 536                   continue;
 537                }
 538                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 539                {
 540                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 541                   if (filename[0] == '/')
 542                      filename.erase(0,1);
 543                   regfree(pattern);
 544                   break;
 545                }
 546                regfree(pattern);
 547             }
 548          }
 549
 550          // deal with the request
 551          if (_config->FindB("aptwebserver::support::http", true) == false &&
 552                LookupTag(*m, "Host").find(":4433") == std::string::npos)
 553          {
 554             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS");
 555             continue;
 556          }
 557          else if (RealFileExists(filename) == true)
 558          {
 559             FileFd data(filename, FileFd::ReadOnly);
 560             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 561             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 562             {
 563                time_t cache;
 564                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 565                      cache >= data.ModificationTime())
 566                {
 567                   sendHead(client, 304, headers);
 568                   continue;
 569                }
 570             }
 571
 572             if (_config->FindB("aptwebserver::support::range", true) == true)
 573                condition = LookupTag(*m, "Range", "");
 574             else
 575                condition.clear();
 576             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 577             {
 578                time_t cache;
 579                std::string ifrange;
 580                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 581                   ifrange = LookupTag(*m, "If-Range", "");
 582                bool validrange = (ifrange.empty() == true ||
 583                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 584                       cache <= data.ModificationTime()));
 585
 586                // FIXME: support multiple byte-ranges (APT clients do not do this)
 587                if (condition.find(',') == std::string::npos)
 588                {
 589                   size_t start = 6;
 590                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 591                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 592                   size_t dash = condition.find('-') + 1;
 593                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 594                   unsigned long long filesize = data.FileSize();
 595                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 596                         validrange == true)
 597                   {
 598                      if (filesize > filestart)
 599                      {
 600                         data.Skip(filestart);
 601                         std::ostringstream contentlength;
 602                         contentlength << "Content-Length: " << (filesize - filestart);
 603                         headers.push_back(contentlength.str());
 604                         std::ostringstream contentrange;
 605                         contentrange << "Content-Range: bytes " << filestart << "-"
 606                            << filesize - 1 << "/" << filesize;
 607                         headers.push_back(contentrange.str());
 608                         sendHead(client, 206, headers);
 609                         if (sendContent == true)
 610                            sendFile(client, data);
 611                         continue;
 612                      }
 613                      else
 614                      {
 615                         headers.push_back("Content-Length: 0");
 616                         std::ostringstream contentrange;
 617                         contentrange << "Content-Range: bytes */" << filesize;
 618                         headers.push_back(contentrange.str());
 619                         sendHead(client, 416, headers);
 620                         continue;
 621                      }
 622                   }
 623                }
 624             }
 625
 626             addFileHeaders(headers, data);
 627             sendHead(client, 200, headers);
 628             if (sendContent == true)
 629                sendFile(client, data);
 630          }
 631          else if (DirectoryExists(filename) == true)
 632          {
 633             if (filename[filename.length()-1] == '/')
 634                sendDirectoryListing(client, filename, *m, sendContent);
 635             else
 636                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 637          }
 638          else
 639             sendError(client, 404, *m, sendContent);
 640       }
 641       _error->DumpErrors(std::cerr);
 642       messages.clear();
 643       if (closeConnection == true)
 644          break;
 645    }
 646    close(client);
 647    std::clog << "CLOSE client " << client << std::endl;
 648    return NULL;
 649 }
 650                                                                         /*}}}*/
 651
 652 int main(int const argc, const char * argv[])
 653 {
 654    CommandLine::Args Args[] = {
 655       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 656       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 657       {'c',"config-file",0,CommandLine::ConfigFile},
 658       {'o',"option",0,CommandLine::ArbItem},
 659       {0,0,0,0}
 660    };
 661
 662    CommandLine CmdL(Args, _config);
 663    if(CmdL.Parse(argc,argv) == false)
 664    {
 665       _error->DumpErrors();
 666       exit(1);
 667    }
 668
 669    // create socket, bind and listen to it {{{
 670    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 671    signal(SIGPIPE, SIG_IGN);
 672    // we don't care for our slaves, so ignore their death
 673    signal(SIGCHLD, SIG_IGN);
 674
 675    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 676    if(sock < 0)
 677    {
 678       _error->Errno("aptwerbserver", "Couldn't create socket");
 679       _error->DumpErrors(std::cerr);
 680       return 1;
 681    }
 682
 683    int const port = _config->FindI("aptwebserver::port", 8080);
 684
 685    // ensure that we accept all connections: v4 or v6
 686    int const iponly = 0;
 687    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 688    // to not linger on an address
 689    int const enable = 1;
 690    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 691
 692    struct sockaddr_in6 locAddr;
 693    memset(&locAddr, 0, sizeof(locAddr));
 694    locAddr.sin6_family = AF_INET6;
 695    locAddr.sin6_port = htons(port);
 696    locAddr.sin6_addr = in6addr_any;
 697
 698    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 699    {
 700       _error->Errno("aptwerbserver", "Couldn't bind");
 701       _error->DumpErrors(std::cerr);
 702       return 2;
 703    }
 704
 705    FileFd pidfile;
 706    if (_config->FindB("aptwebserver::fork", false) == true)
 707    {
 708       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 709       int const pidfilefd = GetLock(pidfilename);
 710       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 711       {
 712          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 713          _error->DumpErrors(std::cerr);
 714          return 3;
 715       }
 716
 717       pid_t child = fork();
 718       if (child < 0)
 719       {
 720          _error->Errno("aptwebserver", "Forking failed");
 721          _error->DumpErrors(std::cerr);
 722          return 4;
 723       }
 724       else if (child != 0)
 725       {
 726          // successfully forked: ready to serve!
 727          std::string pidcontent;
 728          strprintf(pidcontent, "%d", child);
 729          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 730          if (_error->PendingError() == true)
 731          {
 732             _error->DumpErrors(std::cerr);
 733             return 5;
 734          }
 735          std::cout << "Successfully forked as " << child << std::endl;
 736          return 0;
 737       }
 738    }
 739
 740    std::clog << "Serving ANY file on port: " << port << std::endl;
 741
 742    int const slaves = _config->FindB("aptwebserver::slaves", SOMAXCONN);
 743    listen(sock, slaves);
 744    /*}}}*/
 745
 746    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 747    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 748    _config->CndSet("aptwebserver::directoryindex", "index.html");
 749
 750    std::list<int> accepted_clients;
 751
 752    while (true)
 753    {
 754       int client = accept(sock, NULL, NULL);
 755       if (client == -1)
 756       {
 757          if (errno == EINTR)
 758             continue;
 759          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 760          _error->DumpErrors(std::cerr);
 761          return 6;
 762       }
 763
 764       pthread_attr_t attr;
 765       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 766       {
 767          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 768          _error->DumpErrors(std::cerr);
 769          close(client);
 770          continue;
 771       }
 772
 773       pthread_t tid;
 774       // thats rather dirty, but we need to store the client socket somewhere safe
 775       accepted_clients.push_front(client);
 776       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 777       {
 778          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 779          _error->DumpErrors(std::cerr);
 780          close(client);
 781          continue;
 782       }
 783    }
 784    pidfile.Close();
 785
 786    return 0;
 787 }