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