test/interactive-helper/aptwebserver.cc

   1 #include <config.h>
   2
   3 #include <apt-pkg/cmndline.h>
   4 #include <apt-pkg/configuration.h>
   5 #include <apt-pkg/error.h>
   6 #include <apt-pkg/fileutl.h>
   7 #include <apt-pkg/strutl.h>
   8
   9 #include <dirent.h>
  10 #include <errno.h>
  11 #include <netinet/in.h>
  12 #include <pthread.h>
  13 #include <regex.h>
  14 #include <signal.h>
  15 #include <stddef.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/socket.h>
  19 #include <sys/stat.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22
  23 #include <algorithm>
  24 #include <iostream>
  25 #include <sstream>
  26 #include <list>
  27 #include <string>
  28 #include <vector>
  29
  30 static std::string httpcodeToStr(int const httpcode)                    /*{{{*/
  31 {
  32    switch (httpcode)
  33    {
  34       // Informational 1xx
  35       case 100: return _config->Find("aptwebserver::httpcode::100", "100 Continue");
  36       case 101: return _config->Find("aptwebserver::httpcode::101", "101 Switching Protocols");
  37       // Successful 2xx
  38       case 200: return _config->Find("aptwebserver::httpcode::200", "200 OK");
  39       case 201: return _config->Find("aptwebserver::httpcode::201", "201 Created");
  40       case 202: return _config->Find("aptwebserver::httpcode::202", "202 Accepted");
  41       case 203: return _config->Find("aptwebserver::httpcode::203", "203 Non-Authoritative Information");
  42       case 204: return _config->Find("aptwebserver::httpcode::204", "204 No Content");
  43       case 205: return _config->Find("aptwebserver::httpcode::205", "205 Reset Content");
  44       case 206: return _config->Find("aptwebserver::httpcode::206", "206 Partial Content");
  45       // Redirections 3xx
  46       case 300: return _config->Find("aptwebserver::httpcode::300", "300 Multiple Choices");
  47       case 301: return _config->Find("aptwebserver::httpcode::301", "301 Moved Permanently");
  48       case 302: return _config->Find("aptwebserver::httpcode::302", "302 Found");
  49       case 303: return _config->Find("aptwebserver::httpcode::303", "303 See Other");
  50       case 304: return _config->Find("aptwebserver::httpcode::304", "304 Not Modified");
  51       case 305: return _config->Find("aptwebserver::httpcode::305", "305 Use Proxy");
  52       case 307: return _config->Find("aptwebserver::httpcode::307", "307 Temporary Redirect");
  53       // Client errors 4xx
  54       case 400: return _config->Find("aptwebserver::httpcode::400", "400 Bad Request");
  55       case 401: return _config->Find("aptwebserver::httpcode::401", "401 Unauthorized");
  56       case 402: return _config->Find("aptwebserver::httpcode::402", "402 Payment Required");
  57       case 403: return _config->Find("aptwebserver::httpcode::403", "403 Forbidden");
  58       case 404: return _config->Find("aptwebserver::httpcode::404", "404 Not Found");
  59       case 405: return _config->Find("aptwebserver::httpcode::405", "405 Method Not Allowed");
  60       case 406: return _config->Find("aptwebserver::httpcode::406", "406 Not Acceptable");
  61       case 407: return _config->Find("aptwebserver::httpcode::407", "407 Proxy Authentication Required");
  62       case 408: return _config->Find("aptwebserver::httpcode::408", "408 Request Time-out");
  63       case 409: return _config->Find("aptwebserver::httpcode::409", "409 Conflict");
  64       case 410: return _config->Find("aptwebserver::httpcode::410", "410 Gone");
  65       case 411: return _config->Find("aptwebserver::httpcode::411", "411 Length Required");
  66       case 412: return _config->Find("aptwebserver::httpcode::412", "412 Precondition Failed");
  67       case 413: return _config->Find("aptwebserver::httpcode::413", "413 Request Entity Too Large");
  68       case 414: return _config->Find("aptwebserver::httpcode::414", "414 Request-URI Too Large");
  69       case 415: return _config->Find("aptwebserver::httpcode::415", "415 Unsupported Media Type");
  70       case 416: return _config->Find("aptwebserver::httpcode::416", "416 Requested range not satisfiable");
  71       case 417: return _config->Find("aptwebserver::httpcode::417", "417 Expectation Failed");
  72       case 418: return _config->Find("aptwebserver::httpcode::418", "418 I'm a teapot");
  73       // Server error 5xx
  74       case 500: return _config->Find("aptwebserver::httpcode::500", "500 Internal Server Error");
  75       case 501: return _config->Find("aptwebserver::httpcode::501", "501 Not Implemented");
  76       case 502: return _config->Find("aptwebserver::httpcode::502", "502 Bad Gateway");
  77       case 503: return _config->Find("aptwebserver::httpcode::503", "503 Service Unavailable");
  78       case 504: return _config->Find("aptwebserver::httpcode::504", "504 Gateway Time-out");
  79       case 505: return _config->Find("aptwebserver::httpcode::505", "505 HTTP Version not supported");
  80    }
  81    return "";
  82 }
  83                                                                         /*}}}*/
  84 static bool chunkedTransferEncoding(std::list<std::string> const &headers) {
  85    if (std::find(headers.begin(), headers.end(), "Transfer-Encoding: chunked") != headers.end())
  86       return true;
  87    if (_config->FindB("aptwebserver::chunked-transfer-encoding", false) == true)
  88       return true;
  89    return false;
  90 }
  91 static void addFileHeaders(std::list<std::string> &headers, FileFd &data)/*{{{*/
  92 {
  93    if (chunkedTransferEncoding(headers) == false)
  94    {
  95       std::ostringstream contentlength;
  96       contentlength << "Content-Length: " << data.FileSize();
  97       headers.push_back(contentlength.str());
  98    }
  99    if (_config->FindB("aptwebserver::support::last-modified", true) == true)
 100    {
 101       std::string lastmodified("Last-Modified: ");
 102       lastmodified.append(TimeRFC1123(data.ModificationTime()));
 103       headers.push_back(lastmodified);
 104    }
 105 }
 106                                                                         /*}}}*/
 107 static void addDataHeaders(std::list<std::string> &headers, std::string &data)/*{{{*/
 108 {
 109    if (chunkedTransferEncoding(headers) == false)
 110    {
 111       std::ostringstream contentlength;
 112       contentlength << "Content-Length: " << data.size();
 113       headers.push_back(contentlength.str());
 114    }
 115 }
 116                                                                         /*}}}*/
 117 static bool sendHead(int const client, int const httpcode, std::list<std::string> &headers)/*{{{*/
 118 {
 119    std::string response("HTTP/1.1 ");
 120    response.append(httpcodeToStr(httpcode));
 121    headers.push_front(response);
 122    _config->Set("APTWebserver::Last-Status-Code", httpcode);
 123
 124    std::stringstream buffer;
 125    _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
 126    std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
 127    for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
 128       headers.push_back(*h);
 129
 130    std::string date("Date: ");
 131    date.append(TimeRFC1123(time(NULL)));
 132    headers.push_back(date);
 133
 134    if (chunkedTransferEncoding(headers) == true)
 135       headers.push_back("Transfer-Encoding: chunked");
 136
 137    std::clog << ">>> RESPONSE to " << client << " >>>" << std::endl;
 138    bool Success = true;
 139    for (std::list<std::string>::const_iterator h = headers.begin();
 140         Success == true && h != headers.end(); ++h)
 141    {
 142       Success &= FileFd::Write(client, h->c_str(), h->size());
 143       if (Success == true)
 144          Success &= FileFd::Write(client, "\r\n", 2);
 145       std::clog << *h << std::endl;
 146    }
 147    if (Success == true)
 148       Success &= FileFd::Write(client, "\r\n", 2);
 149    std::clog << "<<<<<<<<<<<<<<<<" << std::endl;
 150    return Success;
 151 }
 152                                                                         /*}}}*/
 153 static bool sendFile(int const client, std::list<std::string> const &headers, FileFd &data)/*{{{*/
 154 {
 155    bool Success = true;
 156    bool const chunked = chunkedTransferEncoding(headers);
 157    char buffer[500];
 158    unsigned long long actual = 0;
 159    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
 160    {
 161       if (actual == 0)
 162          break;
 163
 164       if (chunked == true)
 165       {
 166          std::string size;
 167          strprintf(size, "%llX\r\n", actual);
 168          Success &= FileFd::Write(client, size.c_str(), size.size());
 169          Success &= FileFd::Write(client, buffer, actual);
 170          Success &= FileFd::Write(client, "\r\n", strlen("\r\n"));
 171       }
 172       else
 173          Success &= FileFd::Write(client, buffer, actual);
 174    }
 175    if (chunked == true)
 176    {
 177       char const * const finish = "0\r\n\r\n";
 178       Success &= FileFd::Write(client, finish, strlen(finish));
 179    }
 180    if (Success == false)
 181       std::cerr << "SENDFILE:" << (chunked ? " CHUNKED" : "") << " READ/WRITE ERROR to " << client << std::endl;
 182    return Success;
 183 }
 184                                                                         /*}}}*/
 185 static bool sendData(int const client, std::list<std::string> const &headers, std::string const &data)/*{{{*/
 186 {
 187    if (chunkedTransferEncoding(headers) == true)
 188    {
 189       unsigned long long const ullsize = data.length();
 190       std::string size;
 191       strprintf(size, "%llX\r\n", ullsize);
 192       char const * const finish = "\r\n0\r\n\r\n";
 193       if (FileFd::Write(client, size.c_str(), size.length()) == false ||
 194             FileFd::Write(client, data.c_str(), ullsize) == false ||
 195             FileFd::Write(client, finish, strlen(finish)) == false)
 196       {
 197          std::cerr << "SENDDATA: CHUNK WRITE ERROR to " << client << std::endl;
 198          return false;
 199       }
 200    }
 201    else if (FileFd::Write(client, data.c_str(), data.size()) == false)
 202    {
 203       std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
 204       return false;
 205    }
 206    return true;
 207 }
 208                                                                         /*}}}*/
 209 static void sendError(int const client, int const httpcode, std::string const &request,/*{{{*/
 210                bool const content, std::string const &error, std::list<std::string> &headers)
 211 {
 212    std::string response("<html><head><title>");
 213    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 214    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 215    if (httpcode != 200)
 216       response.append("<p><em>Error</em>: ");
 217    else
 218       response.append("<p><em>Success</em>: ");
 219    if (error.empty() == false)
 220       response.append(error);
 221    else
 222       response.append(httpcodeToStr(httpcode));
 223    if (httpcode != 200)
 224       response.append("</p>This error is a result of the request: <pre>");
 225    else
 226       response.append("The successfully executed operation was requested by: <pre>");
 227    response.append(request).append("</pre></body></html>");
 228    if (httpcode != 200)
 229    {
 230       if (_config->FindB("aptwebserver::closeOnError", false) == true)
 231          headers.push_back("Connection: close");
 232    }
 233    addDataHeaders(headers, response);
 234    sendHead(client, httpcode, headers);
 235    if (content == true)
 236       sendData(client, headers, response);
 237 }
 238 static void sendSuccess(int const client, std::string const &request,
 239                bool const content, std::string const &error, std::list<std::string> &headers)
 240 {
 241    sendError(client, 200, request, content, error, headers);
 242 }
 243                                                                         /*}}}*/
 244 static void sendRedirect(int const client, int const httpcode, std::string const &uri,/*{{{*/
 245                   std::string const &request, bool content)
 246 {
 247    std::list<std::string> headers;
 248    std::string response("<html><head><title>");
 249    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 250    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 251    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 252    response.append("This page is a result of the request: <pre>");
 253    response.append(request).append("</pre></body></html>");
 254    addDataHeaders(headers, response);
 255    std::string location("Location: ");
 256    if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
 257    {
 258       std::string const host = LookupTag(request, "Host");
 259       if (host.find(":4433") != std::string::npos)
 260          location.append("https://");
 261       else
 262          location.append("http://");
 263       location.append(host).append("/");
 264       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 265       {
 266          std::string homeuri = SubstVar(uri, "/home/", "~");
 267          homeuri = SubstVar(homeuri, "/public_html/", "/");
 268          location.append(homeuri);
 269       }
 270       else
 271          location.append(uri);
 272    }
 273    else
 274       location.append(uri);
 275    headers.push_back(location);
 276    sendHead(client, httpcode, headers);
 277    if (content == true)
 278       sendData(client, headers, response);
 279 }
 280                                                                         /*}}}*/
 281 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 282 {
 283    if (a->d_name[0] == '.')
 284       return 0;
 285 #ifdef _DIRENT_HAVE_D_TYPE
 286    // if we have the d_type check that only files and dirs will be included
 287    if (a->d_type != DT_UNKNOWN &&
 288        a->d_type != DT_REG &&
 289        a->d_type != DT_LNK && // this includes links to regular files
 290        a->d_type != DT_DIR)
 291       return 0;
 292 #endif
 293    return 1;
 294 }
 295 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 296 #ifdef _DIRENT_HAVE_D_TYPE
 297    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 298    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 299       return -1;
 300    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 301       return 1;
 302    else
 303 #endif
 304    {
 305       struct stat f_prop; //File's property
 306       stat((*a)->d_name, &f_prop);
 307       int const amode = f_prop.st_mode;
 308       stat((*b)->d_name, &f_prop);
 309       int const bmode = f_prop.st_mode;
 310       if (S_ISDIR(amode) && S_ISDIR(bmode));
 311       else if (S_ISDIR(amode))
 312          return -1;
 313       else if (S_ISDIR(bmode))
 314          return 1;
 315    }
 316    return strcasecmp((*a)->d_name, (*b)->d_name);
 317 }
 318                                                                         /*}}}*/
 319 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 320                           std::string const &request, bool content, std::list<std::string> &headers)
 321 {
 322    std::ostringstream listing;
 323
 324    struct dirent **namelist;
 325    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 326    if (counter == -1)
 327    {
 328       sendError(client, 500, request, content, "scandir failed", headers);
 329       return;
 330    }
 331
 332    listing << "<html><head><title>Index of " << dir << "</title>"
 333            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 334            << "tr:nth-child(even){background-color:#dfdfdf;}"
 335            << "h1, td:nth-child(3){text-align:center;}"
 336            << "table {margin-left:auto;margin-right:auto;} --></style>"
 337            << "</head>" << std::endl
 338            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 339            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 340    if (dir != "./")
 341       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 342    for (int i = 0; i < counter; ++i) {
 343       struct stat fs;
 344       std::string filename(dir);
 345       filename.append("/").append(namelist[i]->d_name);
 346       stat(filename.c_str(), &fs);
 347       if (S_ISDIR(fs.st_mode))
 348       {
 349          listing << "<tr><td>d</td>"
 350                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 351                  << "<td>-</td>";
 352       }
 353       else
 354       {
 355          listing << "<tr><td>f</td>"
 356                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 357                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 358       }
 359       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 360    }
 361    listing << "</table></body></html>" << std::endl;
 362
 363    std::string response(listing.str());
 364    addDataHeaders(headers, response);
 365    sendHead(client, 200, headers);
 366    if (content == true)
 367       sendData(client, headers, response);
 368 }
 369                                                                         /*}}}*/
 370 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 371                     std::string &filename, std::string &params, bool &sendContent,
 372                     bool &closeConnection, std::list<std::string> &headers)
 373 {
 374    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 375       sendContent = false;
 376    if (strncmp(request.c_str(), "GET ", 4) != 0)
 377    {
 378       sendError(client, 501, request, true, "", headers);
 379       return false;
 380    }
 381
 382    size_t const lineend = request.find('\n');
 383    size_t filestart = request.find(' ');
 384    for (; request[filestart] == ' '; ++filestart);
 385    size_t fileend = request.rfind(' ', lineend);
 386    if (lineend == std::string::npos || filestart == std::string::npos ||
 387          fileend == std::string::npos || filestart == fileend)
 388    {
 389       sendError(client, 500, request, sendContent, "Filename can't be extracted", headers);
 390       return false;
 391    }
 392
 393    size_t httpstart = fileend;
 394    for (; request[httpstart] == ' '; ++httpstart);
 395    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 396       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 397    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 398       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 399    else
 400    {
 401       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request", headers);
 402       return false;
 403    }
 404
 405    filename = request.substr(filestart, fileend - filestart);
 406    if (filename.find(' ') != std::string::npos)
 407    {
 408       sendError(client, 500, request, sendContent, "Filename contains an unencoded space", headers);
 409       return false;
 410    }
 411
 412    std::string host = LookupTag(request, "Host", "");
 413    if (host.empty() == true)
 414    {
 415       // RFC 2616 §14.23 requires Host
 416       sendError(client, 400, request, sendContent, "Host header is required", headers);
 417       return false;
 418    }
 419    host = "http://" + host;
 420
 421    // Proxies require absolute uris, so this is a simple proxy-fake option
 422    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 423    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
 424    {
 425       if (absolute.find("uri") == std::string::npos)
 426       {
 427          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
 428          return false;
 429       }
 430
 431       // strip the host from the request to make it an absolute path
 432       filename.erase(0, host.length());
 433
 434       std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
 435       std::string auth = LookupTag(request, "Proxy-Authorization", "");
 436       if (authConf.empty() != auth.empty())
 437       {
 438          if (auth.empty())
 439             sendError(client, 407, request, sendContent, "Proxy requires authentication", headers);
 440          else
 441             sendError(client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
 442         return false;
 443       }
 444       if (authConf.empty() == false)
 445       {
 446          char const * const basic = "Basic ";
 447          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 448          {
 449             auth.erase(0, strlen(basic));
 450             if (auth != authConf)
 451             {
 452                sendError(client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
 453                return false;
 454             }
 455          }
 456          else
 457          {
 458             std::list<std::string> headers;
 459             headers.push_back("Proxy-Authenticate: Basic");
 460             sendError(client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
 461             return false;
 462          }
 463       }
 464    }
 465    else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
 466    {
 467       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
 468       return false;
 469    }
 470
 471    if (APT::String::Startswith(filename, "/_config/") == false)
 472    {
 473       std::string const authConf = _config->Find("aptwebserver::authorization", "");
 474       std::string auth = LookupTag(request, "Authorization", "");
 475       if (authConf.empty() != auth.empty())
 476       {
 477          if (auth.empty())
 478             sendError(client, 401, request, sendContent, "Server requires authentication", headers);
 479          else
 480             sendError(client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
 481          return false;
 482       }
 483       if (authConf.empty() == false)
 484       {
 485          char const * const basic = "Basic ";
 486          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 487          {
 488             auth.erase(0, strlen(basic));
 489             if (auth != authConf)
 490             {
 491                sendError(client, 401, request, sendContent, "Authentication doesn't match", headers);
 492                return false;
 493             }
 494          }
 495          else
 496          {
 497             headers.push_back("WWW-Authenticate: Basic");
 498             sendError(client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
 499             return false;
 500          }
 501       }
 502    }
 503
 504    size_t paramspos = filename.find('?');
 505    if (paramspos != std::string::npos)
 506    {
 507       params = filename.substr(paramspos + 1);
 508       filename.erase(paramspos);
 509    }
 510
 511    filename = DeQuoteString(filename);
 512
 513    // this is not a secure server, but at least prevent the obvious …
 514    if (filename.empty() == true || filename[0] != '/' ||
 515        strncmp(filename.c_str(), "//", 2) == 0 ||
 516        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 517        filename.find("/../") != std::string::npos)
 518    {
 519       std::list<std::string> headers;
 520       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
 521       return false;
 522    }
 523
 524    // nuke the first character which is a / as we assured above
 525    filename.erase(0, 1);
 526    if (filename.empty() == true)
 527       filename = "./";
 528    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 529    else if (filename[0] == '~')
 530    {
 531       // /home/user is actually not entirely correct, but good enough for now
 532       size_t dashpos = filename.find('/');
 533       if (dashpos != std::string::npos)
 534       {
 535          std::string home = filename.substr(1, filename.find('/') - 1);
 536          std::string pubhtml = filename.substr(filename.find('/') + 1);
 537          filename = "/home/" + home + "/public_html/" + pubhtml;
 538       }
 539       else
 540          filename = "/home/" + filename.substr(1) + "/public_html/";
 541    }
 542
 543    // if no filename is given, but a valid directory see if we can use an index or
 544    // have to resort to a autogenerated directory listing later on
 545    if (DirectoryExists(filename) == true)
 546    {
 547       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 548       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 549             RealFileExists(filename + directoryIndex) == true)
 550          filename += directoryIndex;
 551    }
 552
 553    return true;
 554 }
 555                                                                         /*}}}*/
 556 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request,/*{{{*/
 557       std::vector<std::string> parts, std::list<std::string> &headers)
 558 {
 559    size_t const pcount = parts.size();
 560    for (size_t i = 0; i < pcount; ++i)
 561       parts[i] = DeQuoteString(parts[i]);
 562    if (pcount == 4 && parts[1] == "set")
 563    {
 564       _config->Set(parts[2], parts[3]);
 565       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
 566       return true;
 567    }
 568    else if (pcount == 4 && parts[1] == "find")
 569    {
 570       std::string response = _config->Find(parts[2], parts[3]);
 571       addDataHeaders(headers, response);
 572       sendHead(client, 200, headers);
 573       sendData(client, headers, response);
 574       return true;
 575    }
 576    else if (pcount == 3 && parts[1] == "find")
 577    {
 578       if (_config->Exists(parts[2]) == true)
 579       {
 580          std::string response = _config->Find(parts[2]);
 581          addDataHeaders(headers, response);
 582          sendHead(client, 200, headers);
 583          sendData(client, headers, response);
 584          return true;
 585       }
 586       sendError(client, 404, request, true, "Requested Configuration option doesn't exist", headers);
 587       return false;
 588    }
 589    else if (pcount == 3 && parts[1] == "clear")
 590    {
 591       _config->Clear(parts[2]);
 592       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
 593       return true;
 594    }
 595
 596    sendError(client, 400, request, true, "Unknown on-the-fly configuration request", headers);
 597    return false;
 598 }
 599                                                                         /*}}}*/
 600 static void * handleClient(void * voidclient)                           /*{{{*/
 601 {
 602    int client = *((int*)(voidclient));
 603    std::clog << "ACCEPT client " << client << std::endl;
 604    bool closeConnection = false;
 605    while (closeConnection == false)
 606    {
 607       std::vector<std::string> messages;
 608       if (ReadMessages(client, messages) == false)
 609          break;
 610
 611       std::list<std::string> headers;
 612       for (std::vector<std::string>::const_iterator m = messages.begin();
 613             m != messages.end() && closeConnection == false; ++m) {
 614          // if we announced a closing in previous response, do the close now
 615          if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 616          {
 617             closeConnection = true;
 618             break;
 619          }
 620          headers.clear();
 621
 622          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 623             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 624          std::string filename;
 625          std::string params;
 626          bool sendContent = true;
 627          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection, headers) == false)
 628             continue;
 629
 630          // special webserver command request
 631          if (filename.length() > 1 && filename[0] == '_')
 632          {
 633             std::vector<std::string> parts = VectorizeString(filename, '/');
 634             if (parts[0] == "_config")
 635             {
 636                handleOnTheFlyReconfiguration(client, *m, parts, headers);
 637                continue;
 638             }
 639          }
 640
 641          // string replacements in the requested filename
 642          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 643          if (Replaces != NULL)
 644          {
 645             std::string redirect = "/" + filename;
 646             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 647                redirect = SubstVar(redirect, I->Tag, I->Value);
 648             if (redirect.empty() == false && redirect[0] == '/')
 649                redirect.erase(0,1);
 650             if (redirect != filename)
 651             {
 652                sendRedirect(client, 301, redirect, *m, sendContent);
 653                continue;
 654             }
 655          }
 656
 657          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 658          if (Overwrite != NULL)
 659          {
 660             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 661             {
 662                regex_t *pattern = new regex_t;
 663                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 664                if (res != 0)
 665                {
 666                   char error[300];
 667                   regerror(res, pattern, error, sizeof(error));
 668                   sendError(client, 500, *m, sendContent, error, headers);
 669                   continue;
 670                }
 671                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 672                {
 673                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 674                   if (filename[0] == '/')
 675                      filename.erase(0,1);
 676                   regfree(pattern);
 677                   break;
 678                }
 679                regfree(pattern);
 680             }
 681          }
 682
 683          // deal with the request
 684          if (_config->FindB("aptwebserver::support::http", true) == false &&
 685                LookupTag(*m, "Host").find(":4433") == std::string::npos)
 686          {
 687             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
 688             continue;
 689          }
 690          else if (RealFileExists(filename) == true)
 691          {
 692             FileFd data(filename, FileFd::ReadOnly);
 693             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 694             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 695             {
 696                time_t cache;
 697                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 698                      cache >= data.ModificationTime())
 699                {
 700                   sendHead(client, 304, headers);
 701                   continue;
 702                }
 703             }
 704
 705             if (_config->FindB("aptwebserver::support::range", true) == true)
 706                condition = LookupTag(*m, "Range", "");
 707             else
 708                condition.clear();
 709             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 710             {
 711                time_t cache;
 712                std::string ifrange;
 713                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 714                   ifrange = LookupTag(*m, "If-Range", "");
 715                bool validrange = (ifrange.empty() == true ||
 716                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 717                       cache <= data.ModificationTime()));
 718
 719                // FIXME: support multiple byte-ranges (APT clients do not do this)
 720                if (condition.find(',') == std::string::npos)
 721                {
 722                   size_t start = 6;
 723                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 724                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 725                   size_t dash = condition.find('-') + 1;
 726                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 727                   unsigned long long filesize = data.FileSize();
 728                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 729                         validrange == true)
 730                   {
 731                      if (filesize > filestart)
 732                      {
 733                         data.Skip(filestart);
 734                         // make sure to send content-range before conent-length
 735                         // as regression test for LP: #1445239
 736                         std::ostringstream contentrange;
 737                         contentrange << "Content-Range: bytes " << filestart << "-"
 738                            << filesize - 1 << "/" << filesize;
 739                         headers.push_back(contentrange.str());
 740                         std::ostringstream contentlength;
 741                         contentlength << "Content-Length: " << (filesize - filestart);
 742                         headers.push_back(contentlength.str());
 743                         sendHead(client, 206, headers);
 744                         if (sendContent == true)
 745                            sendFile(client, headers, data);
 746                         continue;
 747                      }
 748                      else
 749                      {
 750                         if (_config->FindB("aptwebserver::support::content-range", true) == true)
 751                         {
 752                            std::ostringstream contentrange;
 753                            contentrange << "Content-Range: bytes */" << filesize;
 754                            headers.push_back(contentrange.str());
 755                         }
 756                         sendError(client, 416, *m, sendContent, "", headers);
 757                         break;
 758                      }
 759                   }
 760                }
 761             }
 762
 763             addFileHeaders(headers, data);
 764             sendHead(client, 200, headers);
 765             if (sendContent == true)
 766                sendFile(client, headers, data);
 767          }
 768          else if (DirectoryExists(filename) == true)
 769          {
 770             if (filename[filename.length()-1] == '/')
 771                sendDirectoryListing(client, filename, *m, sendContent, headers);
 772             else
 773                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 774          }
 775          else
 776             sendError(client, 404, *m, sendContent, "", headers);
 777       }
 778
 779       // if we announced a closing in the last response, do the close now
 780       if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 781          closeConnection = true;
 782
 783       if (_error->PendingError() == true)
 784          break;
 785       _error->DumpErrors(std::cerr);
 786    }
 787    _error->DumpErrors(std::cerr);
 788    close(client);
 789    std::clog << "CLOSE client " << client << std::endl;
 790    return NULL;
 791 }
 792                                                                         /*}}}*/
 793
 794 int main(int const argc, const char * argv[])
 795 {
 796    CommandLine::Args Args[] = {
 797       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 798       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 799       {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
 800       {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
 801       {'c',"config-file",0,CommandLine::ConfigFile},
 802       {'o',"option",0,CommandLine::ArbItem},
 803       {0,0,0,0}
 804    };
 805
 806    CommandLine CmdL(Args, _config);
 807    if(CmdL.Parse(argc,argv) == false)
 808    {
 809       _error->DumpErrors();
 810       exit(1);
 811    }
 812
 813    // create socket, bind and listen to it {{{
 814    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 815    signal(SIGPIPE, SIG_IGN);
 816    // we don't care for our slaves, so ignore their death
 817    signal(SIGCHLD, SIG_IGN);
 818
 819    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 820    if(sock < 0)
 821    {
 822       _error->Errno("aptwerbserver", "Couldn't create socket");
 823       _error->DumpErrors(std::cerr);
 824       return 1;
 825    }
 826
 827    int const port = _config->FindI("aptwebserver::port", 8080);
 828
 829    // ensure that we accept all connections: v4 or v6
 830    int const iponly = 0;
 831    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 832    // to not linger on an address
 833    int const enable = 1;
 834    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 835
 836    struct sockaddr_in6 locAddr;
 837    memset(&locAddr, 0, sizeof(locAddr));
 838    locAddr.sin6_family = AF_INET6;
 839    locAddr.sin6_port = htons(port);
 840    locAddr.sin6_addr = in6addr_any;
 841
 842    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 843    {
 844       _error->Errno("aptwerbserver", "Couldn't bind");
 845       _error->DumpErrors(std::cerr);
 846       return 2;
 847    }
 848
 849    FileFd pidfile;
 850    if (_config->FindB("aptwebserver::fork", false) == true)
 851    {
 852       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 853       int const pidfilefd = GetLock(pidfilename);
 854       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 855       {
 856          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 857          _error->DumpErrors(std::cerr);
 858          return 3;
 859       }
 860
 861       pid_t child = fork();
 862       if (child < 0)
 863       {
 864          _error->Errno("aptwebserver", "Forking failed");
 865          _error->DumpErrors(std::cerr);
 866          return 4;
 867       }
 868       else if (child != 0)
 869       {
 870          // successfully forked: ready to serve!
 871          std::string pidcontent;
 872          strprintf(pidcontent, "%d", child);
 873          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 874          if (_error->PendingError() == true)
 875          {
 876             _error->DumpErrors(std::cerr);
 877             return 5;
 878          }
 879          std::cout << "Successfully forked as " << child << std::endl;
 880          return 0;
 881       }
 882    }
 883
 884    std::clog << "Serving ANY file on port: " << port << std::endl;
 885
 886    int const slaves = _config->FindI("aptwebserver::slaves", SOMAXCONN);
 887    std::cerr << "SLAVES: " << slaves << std::endl;
 888    listen(sock, slaves);
 889    /*}}}*/
 890
 891    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 892    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 893    _config->CndSet("aptwebserver::directoryindex", "index.html");
 894
 895    std::list<int> accepted_clients;
 896
 897    while (true)
 898    {
 899       int client = accept(sock, NULL, NULL);
 900       if (client == -1)
 901       {
 902          if (errno == EINTR)
 903             continue;
 904          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 905          _error->DumpErrors(std::cerr);
 906          return 6;
 907       }
 908
 909       pthread_attr_t attr;
 910       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 911       {
 912          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 913          _error->DumpErrors(std::cerr);
 914          close(client);
 915          continue;
 916       }
 917
 918       pthread_t tid;
 919       // thats rather dirty, but we need to store the client socket somewhere safe
 920       accepted_clients.push_front(client);
 921       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 922       {
 923          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 924          _error->DumpErrors(std::cerr);
 925          close(client);
 926          continue;
 927       }
 928    }
 929    pidfile.Close();
 930
 931    return 0;
 932 }