test/interactive-helper/aptwebserver.cc

   1 #include <config.h>
   2
   3 #include <apt-pkg/strutl.h>
   4 #include <apt-pkg/fileutl.h>
   5 #include <apt-pkg/error.h>
   6 #include <apt-pkg/cmndline.h>
   7 #include <apt-pkg/configuration.h>
   8 #include <apt-pkg/init.h>
   9
  10 #include <vector>
  11 #include <string>
  12 #include <list>
  13 #include <sstream>
  14
  15 #include <sys/socket.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <netinet/in.h>
  19 #include <unistd.h>
  20 #include <errno.h>
  21 #include <time.h>
  22 #include <stdlib.h>
  23 #include <dirent.h>
  24 #include <signal.h>
  25
  26 char const * const httpcodeToStr(int const httpcode)                    /*{{{*/
  27 {
  28    switch (httpcode)
  29    {
  30       // Informational 1xx
  31       case 100: return "100 Continue";
  32       case 101: return "101 Switching Protocols";
  33       // Successful 2xx
  34       case 200: return "200 OK";
  35       case 201: return "201 Created";
  36       case 202: return "202 Accepted";
  37       case 203: return "203 Non-Authoritative Information";
  38       case 204: return "204 No Content";
  39       case 205: return "205 Reset Content";
  40       case 206: return "206 Partial Content";
  41       // Redirections 3xx
  42       case 300: return "300 Multiple Choices";
  43       case 301: return "301 Moved Permanently";
  44       case 302: return "302 Found";
  45       case 303: return "303 See Other";
  46       case 304: return "304 Not Modified";
  47       case 305: return "304 Use Proxy";
  48       case 307: return "307 Temporary Redirect";
  49       // Client errors 4xx
  50       case 400: return "400 Bad Request";
  51       case 401: return "401 Unauthorized";
  52       case 402: return "402 Payment Required";
  53       case 403: return "403 Forbidden";
  54       case 404: return "404 Not Found";
  55       case 405: return "405 Method Not Allowed";
  56       case 406: return "406 Not Acceptable";
  57       case 407: return "407 Proxy Authentication Required";
  58       case 408: return "408 Request Time-out";
  59       case 409: return "409 Conflict";
  60       case 410: return "410 Gone";
  61       case 411: return "411 Length Required";
  62       case 412: return "412 Precondition Failed";
  63       case 413: return "413 Request Entity Too Large";
  64       case 414: return "414 Request-URI Too Large";
  65       case 415: return "415 Unsupported Media Type";
  66       case 416: return "416 Requested range not satisfiable";
  67       case 417: return "417 Expectation Failed";
  68       case 418: return "418 I'm a teapot";
  69       // Server error 5xx
  70       case 500: return "500 Internal Server Error";
  71       case 501: return "501 Not Implemented";
  72       case 502: return "502 Bad Gateway";
  73       case 503: return "503 Service Unavailable";
  74       case 504: return "504 Gateway Time-out";
  75       case 505: return "505 HTTP Version not supported";
  76    }
  77    return NULL;
  78 }
  79                                                                         /*}}}*/
  80 void addFileHeaders(std::list<std::string> &headers, FileFd &data)      /*{{{*/
  81 {
  82    std::ostringstream contentlength;
  83    contentlength << "Content-Length: " << data.FileSize();
  84    headers.push_back(contentlength.str());
  85
  86    std::string lastmodified("Last-Modified: ");
  87    lastmodified.append(TimeRFC1123(data.ModificationTime()));
  88    headers.push_back(lastmodified);
  89 }
  90                                                                         /*}}}*/
  91 void addDataHeaders(std::list<std::string> &headers, std::string &data) /*{{{*/
  92 {
  93    std::ostringstream contentlength;
  94    contentlength << "Content-Length: " << data.size();
  95    headers.push_back(contentlength.str());
  96 }
  97                                                                         /*}}}*/
  98 bool sendHead(int const client, int const httpcode, std::list<std::string> &headers)/*{{{*/
  99 {
 100    std::string response("HTTP/1.1 ");
 101    response.append(httpcodeToStr(httpcode));
 102    headers.push_front(response);
 103    _config->Set("APTWebserver::Last-Status-Code", httpcode);
 104
 105    std::stringstream buffer;
 106    _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
 107    std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
 108    for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
 109       headers.push_back(*h);
 110
 111    std::string date("Date: ");
 112    date.append(TimeRFC1123(time(NULL)));
 113    headers.push_back(date);
 114
 115    std::clog << ">>> RESPONSE >>>" << std::endl;
 116    bool Success = true;
 117    for (std::list<std::string>::const_iterator h = headers.begin();
 118         Success == true && h != headers.end(); ++h)
 119    {
 120       Success &= FileFd::Write(client, h->c_str(), h->size());
 121       if (Success == true)
 122          Success &= FileFd::Write(client, "\r\n", 2);
 123       std::clog << *h << std::endl;
 124    }
 125    if (Success == true)
 126       Success &= FileFd::Write(client, "\r\n", 2);
 127    std::clog << "<<<<<<<<<<<<<<<<" << std::endl;
 128    return Success;
 129 }
 130                                                                         /*}}}*/
 131 bool sendFile(int const client, FileFd &data)                           /*{{{*/
 132 {
 133    bool Success = true;
 134    char buffer[500];
 135    unsigned long long actual = 0;
 136    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
 137    {
 138       if (actual == 0)
 139          break;
 140       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, 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    filename = DeQuoteString(filename);
 379
 380    // this is not a secure server, but at least prevent the obvious …
 381    if (filename.empty() == true || filename[0] != '/' ||
 382        strncmp(filename.c_str(), "//", 2) == 0 ||
 383        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 384        filename.find("/../") != std::string::npos)
 385    {
 386       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)");
 387       return false;
 388    }
 389
 390    // nuke the first character which is a / as we assured above
 391    filename.erase(0, 1);
 392    if (filename.empty() == true)
 393       filename = ".";
 394    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 395    else if (filename[0] == '~')
 396    {
 397       // /home/user is actually not entirely correct, but good enough for now
 398       size_t dashpos = filename.find('/');
 399       if (dashpos != std::string::npos)
 400       {
 401          std::string home = filename.substr(1, filename.find('/') - 1);
 402          std::string pubhtml = filename.substr(filename.find('/') + 1);
 403          filename = "/home/" + home + "/public_html/" + pubhtml;
 404       }
 405       else
 406          filename = "/home/" + filename.substr(1) + "/public_html/";
 407    }
 408    return true;
 409 }
 410                                                                         /*}}}*/
 411 bool handleOnTheFlyReconfiguration(int const client, std::string const &request, std::vector<std::string> const &parts)/*{{{*/
 412 {
 413    size_t const pcount = parts.size();
 414    if (pcount == 4 && parts[1] == "set")
 415    {
 416       _config->Set(parts[2], parts[3]);
 417       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!");
 418       return true;
 419    }
 420    else if (pcount == 4 && parts[1] == "find")
 421    {
 422       std::list<std::string> headers;
 423       std::string response = _config->Find(parts[2], parts[3]);
 424       addDataHeaders(headers, response);
 425       sendHead(client, 200, headers);
 426       sendData(client, response);
 427       return true;
 428    }
 429    else if (pcount == 3 && parts[1] == "find")
 430    {
 431       std::list<std::string> headers;
 432       if (_config->Exists(parts[2]) == true)
 433       {
 434          std::string response = _config->Find(parts[2]);
 435          addDataHeaders(headers, response);
 436          sendHead(client, 200, headers);
 437          sendData(client, response);
 438          return true;
 439       }
 440       sendError(client, 404, request, "Requested Configuration option doesn't exist.");
 441       return false;
 442    }
 443    else if (pcount == 3 && parts[1] == "clear")
 444    {
 445       _config->Clear(parts[2]);
 446       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.");
 447       return true;
 448    }
 449
 450    sendError(client, 400, request, true, "Unknown on-the-fly configuration request");
 451    return false;
 452 }
 453                                                                         /*}}}*/
 454 int main(int const argc, const char * argv[])
 455 {
 456    CommandLine::Args Args[] = {
 457       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 458       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 459       {'c',"config-file",0,CommandLine::ConfigFile},
 460       {'o',"option",0,CommandLine::ArbItem},
 461       {0,0,0,0}
 462    };
 463
 464    CommandLine CmdL(Args, _config);
 465    if(CmdL.Parse(argc,argv) == false)
 466    {
 467       _error->DumpErrors();
 468       exit(1);
 469    }
 470
 471    // create socket, bind and listen to it {{{
 472    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 473    signal(SIGPIPE, SIG_IGN);
 474    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 475    if(sock < 0)
 476    {
 477       _error->Errno("aptwerbserver", "Couldn't create socket");
 478       _error->DumpErrors(std::cerr);
 479       return 1;
 480    }
 481
 482    int const port = _config->FindI("aptwebserver::port", 8080);
 483
 484    // ensure that we accept all connections: v4 or v6
 485    int const iponly = 0;
 486    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 487    // to not linger on an address
 488    int const enable = 1;
 489    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 490
 491    struct sockaddr_in6 locAddr;
 492    memset(&locAddr, 0, sizeof(locAddr));
 493    locAddr.sin6_family = AF_INET6;
 494    locAddr.sin6_port = htons(port);
 495    locAddr.sin6_addr = in6addr_any;
 496
 497    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 498    {
 499       _error->Errno("aptwerbserver", "Couldn't bind");
 500       _error->DumpErrors(std::cerr);
 501       return 2;
 502    }
 503
 504    FileFd pidfile;
 505    if (_config->FindB("aptwebserver::fork", false) == true)
 506    {
 507       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 508       int const pidfilefd = GetLock(pidfilename);
 509       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 510       {
 511          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 512          _error->DumpErrors(std::cerr);
 513          return 3;
 514       }
 515
 516       pid_t child = fork();
 517       if (child < 0)
 518       {
 519          _error->Errno("aptwebserver", "Forking failed");
 520          _error->DumpErrors(std::cerr);
 521          return 4;
 522       }
 523       else if (child != 0)
 524       {
 525          // successfully forked: ready to serve!
 526          std::string pidcontent;
 527          strprintf(pidcontent, "%d", child);
 528          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 529          if (_error->PendingError() == true)
 530          {
 531             _error->DumpErrors(std::cerr);
 532             return 5;
 533          }
 534          std::cout << "Successfully forked as " << child << std::endl;
 535          return 0;
 536       }
 537    }
 538
 539    std::clog << "Serving ANY file on port: " << port << std::endl;
 540
 541    listen(sock, 1);
 542    /*}}}*/
 543
 544    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 545    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 546
 547    std::vector<std::string> messages;
 548    int client;
 549    while ((client = accept(sock, NULL, NULL)) != -1)
 550    {
 551       std::clog << "ACCEPT client " << client
 552                 << " on socket " << sock << std::endl;
 553
 554       while (ReadMessages(client, messages))
 555       {
 556          bool closeConnection = false;
 557          for (std::vector<std::string>::const_iterator m = messages.begin();
 558               m != messages.end() && closeConnection == false; ++m) {
 559             std::clog << ">>> REQUEST >>>>" << std::endl << *m
 560                       << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 561             std::list<std::string> headers;
 562             std::string filename;
 563             bool sendContent = true;
 564             if (parseFirstLine(client, *m, filename, sendContent, closeConnection) == false)
 565                continue;
 566
 567             // special webserver command request
 568             if (filename.length() > 1 && filename[0] == '_')
 569             {
 570                std::vector<std::string> parts = VectorizeString(filename, '/');
 571                if (parts[0] == "_config")
 572                {
 573                   handleOnTheFlyReconfiguration(client, *m, parts);
 574                   continue;
 575                }
 576             }
 577
 578             // string replacements in the requested filename
 579             ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 580             if (Replaces != NULL)
 581             {
 582                std::string redirect = "/" + filename;
 583                for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 584                   redirect = SubstVar(redirect, I->Tag, I->Value);
 585                redirect.erase(0,1);
 586                if (redirect != filename)
 587                {
 588                   sendRedirect(client, 301, redirect, *m, sendContent);
 589                   continue;
 590                }
 591             }
 592
 593             ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 594             if (Overwrite != NULL)
 595             {
 596                for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 597                {
 598                   regex_t *pattern = new regex_t;
 599                   int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 600                   if (res != 0)
 601                   {
 602                      char error[300];
 603                      regerror(res, pattern, error, sizeof(error));
 604                      sendError(client, 500, *m, sendContent, error);
 605                      continue;
 606                   }
 607                   if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 608                   {
 609                       filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 610                       if (filename[0] == '/')
 611                          filename.erase(0,1);
 612                       regfree(pattern);
 613                       break;
 614                   }
 615                   regfree(pattern);
 616                }
 617             }
 618
 619             // deal with the request
 620             if (RealFileExists(filename) == true)
 621             {
 622                FileFd data(filename, FileFd::ReadOnly);
 623                std::string condition = LookupTag(*m, "If-Modified-Since", "");
 624                if (condition.empty() == false)
 625                {
 626                   time_t cache;
 627                   if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 628                         cache >= data.ModificationTime())
 629                   {
 630                      sendHead(client, 304, headers);
 631                      continue;
 632                   }
 633                }
 634
 635                if (_config->FindB("aptwebserver::support::range", true) == true)
 636                   condition = LookupTag(*m, "Range", "");
 637                else
 638                   condition.clear();
 639                if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 640                {
 641                   time_t cache;
 642                   std::string ifrange;
 643                   if (_config->FindB("aptwebserver::support::if-range", true) == true)
 644                      ifrange = LookupTag(*m, "If-Range", "");
 645                   bool validrange = (ifrange.empty() == true ||
 646                         (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 647                          cache <= data.ModificationTime()));
 648
 649                   // FIXME: support multiple byte-ranges (APT clients do not do this)
 650                   if (condition.find(',') == std::string::npos)
 651                   {
 652                      size_t start = 6;
 653                      unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 654                      // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 655                      size_t dash = condition.find('-') + 1;
 656                      unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 657                      unsigned long long filesize = data.FileSize();
 658                      if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 659                            validrange == true)
 660                      {
 661                         if (filesize > filestart)
 662                         {
 663                            data.Skip(filestart);
 664                            std::ostringstream contentlength;
 665                            contentlength << "Content-Length: " << (filesize - filestart);
 666                            headers.push_back(contentlength.str());
 667                            std::ostringstream contentrange;
 668                            contentrange << "Content-Range: bytes " << filestart << "-"
 669                               << filesize - 1 << "/" << filesize;
 670                            headers.push_back(contentrange.str());
 671                            sendHead(client, 206, headers);
 672                            if (sendContent == true)
 673                               sendFile(client, data);
 674                            continue;
 675                         }
 676                         else
 677                         {
 678                            headers.push_back("Content-Length: 0");
 679                            std::ostringstream contentrange;
 680                            contentrange << "Content-Range: bytes */" << filesize;
 681                            headers.push_back(contentrange.str());
 682                            sendHead(client, 416, headers);
 683                            continue;
 684                         }
 685                      }
 686                   }
 687                }
 688
 689                addFileHeaders(headers, data);
 690                sendHead(client, 200, headers);
 691                if (sendContent == true)
 692                   sendFile(client, data);
 693             }
 694             else if (DirectoryExists(filename) == true)
 695             {
 696                if (filename == "." || filename[filename.length()-1] == '/')
 697                   sendDirectoryListing(client, filename, *m, sendContent);
 698                else
 699                   sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 700             }
 701             else
 702                sendError(client, 404, *m, sendContent);
 703          }
 704          _error->DumpErrors(std::cerr);
 705          messages.clear();
 706          if (closeConnection == true)
 707             break;
 708       }
 709
 710       std::clog << "CLOSE client " << client
 711                 << " on socket " << sock << std::endl;
 712       close(client);
 713    }
 714    pidfile.Close();
 715
 716    return 0;
 717 }