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       unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 260       std::string hosthttpsport;
 261       strprintf(hosthttpsport, ":%u", httpsport);
 262       if (host.find(hosthttpsport) != std::string::npos)
 263          location.append("https://");
 264       else
 265          location.append("http://");
 266       location.append(host).append("/");
 267       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 268       {
 269          std::string homeuri = SubstVar(uri, "/home/", "~");
 270          homeuri = SubstVar(homeuri, "/public_html/", "/");
 271          location.append(homeuri);
 272       }
 273       else
 274          location.append(uri);
 275    }
 276    else
 277       location.append(uri);
 278    headers.push_back(location);
 279    sendHead(client, httpcode, headers);
 280    if (content == true)
 281       sendData(client, headers, response);
 282 }
 283                                                                         /*}}}*/
 284 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 285 {
 286    if (a->d_name[0] == '.')
 287       return 0;
 288 #ifdef _DIRENT_HAVE_D_TYPE
 289    // if we have the d_type check that only files and dirs will be included
 290    if (a->d_type != DT_UNKNOWN &&
 291        a->d_type != DT_REG &&
 292        a->d_type != DT_LNK && // this includes links to regular files
 293        a->d_type != DT_DIR)
 294       return 0;
 295 #endif
 296    return 1;
 297 }
 298 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 299 #ifdef _DIRENT_HAVE_D_TYPE
 300    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 301    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 302       return -1;
 303    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 304       return 1;
 305    else
 306 #endif
 307    {
 308       struct stat f_prop; //File's property
 309       stat((*a)->d_name, &f_prop);
 310       int const amode = f_prop.st_mode;
 311       stat((*b)->d_name, &f_prop);
 312       int const bmode = f_prop.st_mode;
 313       if (S_ISDIR(amode) && S_ISDIR(bmode));
 314       else if (S_ISDIR(amode))
 315          return -1;
 316       else if (S_ISDIR(bmode))
 317          return 1;
 318    }
 319    return strcasecmp((*a)->d_name, (*b)->d_name);
 320 }
 321                                                                         /*}}}*/
 322 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 323                           std::string const &request, bool content, std::list<std::string> &headers)
 324 {
 325    std::ostringstream listing;
 326
 327    struct dirent **namelist;
 328    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 329    if (counter == -1)
 330    {
 331       sendError(client, 500, request, content, "scandir failed", headers);
 332       return;
 333    }
 334
 335    listing << "<html><head><title>Index of " << dir << "</title>"
 336            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 337            << "tr:nth-child(even){background-color:#dfdfdf;}"
 338            << "h1, td:nth-child(3){text-align:center;}"
 339            << "table {margin-left:auto;margin-right:auto;} --></style>"
 340            << "</head>" << std::endl
 341            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 342            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 343    if (dir != "./")
 344       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 345    for (int i = 0; i < counter; ++i) {
 346       struct stat fs;
 347       std::string filename(dir);
 348       filename.append("/").append(namelist[i]->d_name);
 349       stat(filename.c_str(), &fs);
 350       if (S_ISDIR(fs.st_mode))
 351       {
 352          listing << "<tr><td>d</td>"
 353                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 354                  << "<td>-</td>";
 355       }
 356       else
 357       {
 358          listing << "<tr><td>f</td>"
 359                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 360                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 361       }
 362       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 363    }
 364    listing << "</table></body></html>" << std::endl;
 365
 366    std::string response(listing.str());
 367    addDataHeaders(headers, response);
 368    sendHead(client, 200, headers);
 369    if (content == true)
 370       sendData(client, headers, response);
 371 }
 372                                                                         /*}}}*/
 373 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 374                     std::string &filename, std::string &params, bool &sendContent,
 375                     bool &closeConnection, std::list<std::string> &headers)
 376 {
 377    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 378       sendContent = false;
 379    if (strncmp(request.c_str(), "GET ", 4) != 0)
 380    {
 381       sendError(client, 501, request, true, "", headers);
 382       return false;
 383    }
 384
 385    size_t const lineend = request.find('\n');
 386    size_t filestart = request.find(' ');
 387    for (; request[filestart] == ' '; ++filestart);
 388    size_t fileend = request.rfind(' ', lineend);
 389    if (lineend == std::string::npos || filestart == std::string::npos ||
 390          fileend == std::string::npos || filestart == fileend)
 391    {
 392       sendError(client, 500, request, sendContent, "Filename can't be extracted", headers);
 393       return false;
 394    }
 395
 396    size_t httpstart = fileend;
 397    for (; request[httpstart] == ' '; ++httpstart);
 398    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 399       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 400    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 401       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 402    else
 403    {
 404       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request", headers);
 405       return false;
 406    }
 407
 408    filename = request.substr(filestart, fileend - filestart);
 409    if (filename.find(' ') != std::string::npos)
 410    {
 411       sendError(client, 500, request, sendContent, "Filename contains an unencoded space", headers);
 412       return false;
 413    }
 414
 415    std::string host = LookupTag(request, "Host", "");
 416    if (host.empty() == true)
 417    {
 418       // RFC 2616 §14.23 requires Host
 419       sendError(client, 400, request, sendContent, "Host header is required", headers);
 420       return false;
 421    }
 422    host = "http://" + host;
 423
 424    // Proxies require absolute uris, so this is a simple proxy-fake option
 425    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 426    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
 427    {
 428       if (absolute.find("uri") == std::string::npos)
 429       {
 430          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
 431          return false;
 432       }
 433
 434       // strip the host from the request to make it an absolute path
 435       filename.erase(0, host.length());
 436
 437       std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
 438       std::string auth = LookupTag(request, "Proxy-Authorization", "");
 439       if (authConf.empty() != auth.empty())
 440       {
 441          if (auth.empty())
 442             sendError(client, 407, request, sendContent, "Proxy requires authentication", headers);
 443          else
 444             sendError(client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
 445         return false;
 446       }
 447       if (authConf.empty() == false)
 448       {
 449          char const * const basic = "Basic ";
 450          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 451          {
 452             auth.erase(0, strlen(basic));
 453             if (auth != authConf)
 454             {
 455                sendError(client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
 456                return false;
 457             }
 458          }
 459          else
 460          {
 461             std::list<std::string> headers;
 462             headers.push_back("Proxy-Authenticate: Basic");
 463             sendError(client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
 464             return false;
 465          }
 466       }
 467    }
 468    else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
 469    {
 470       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
 471       return false;
 472    }
 473
 474    if (APT::String::Startswith(filename, "/_config/") == false)
 475    {
 476       std::string const authConf = _config->Find("aptwebserver::authorization", "");
 477       std::string auth = LookupTag(request, "Authorization", "");
 478       if (authConf.empty() != auth.empty())
 479       {
 480          if (auth.empty())
 481             sendError(client, 401, request, sendContent, "Server requires authentication", headers);
 482          else
 483             sendError(client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
 484          return false;
 485       }
 486       if (authConf.empty() == false)
 487       {
 488          char const * const basic = "Basic ";
 489          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 490          {
 491             auth.erase(0, strlen(basic));
 492             if (auth != authConf)
 493             {
 494                sendError(client, 401, request, sendContent, "Authentication doesn't match", headers);
 495                return false;
 496             }
 497          }
 498          else
 499          {
 500             headers.push_back("WWW-Authenticate: Basic");
 501             sendError(client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
 502             return false;
 503          }
 504       }
 505    }
 506
 507    size_t paramspos = filename.find('?');
 508    if (paramspos != std::string::npos)
 509    {
 510       params = filename.substr(paramspos + 1);
 511       filename.erase(paramspos);
 512    }
 513
 514    filename = DeQuoteString(filename);
 515
 516    // this is not a secure server, but at least prevent the obvious …
 517    if (filename.empty() == true || filename[0] != '/' ||
 518        strncmp(filename.c_str(), "//", 2) == 0 ||
 519        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 520        filename.find("/../") != std::string::npos)
 521    {
 522       std::list<std::string> headers;
 523       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
 524       return false;
 525    }
 526
 527    // nuke the first character which is a / as we assured above
 528    filename.erase(0, 1);
 529    if (filename.empty() == true)
 530       filename = "./";
 531    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 532    else if (filename[0] == '~')
 533    {
 534       // /home/user is actually not entirely correct, but good enough for now
 535       size_t dashpos = filename.find('/');
 536       if (dashpos != std::string::npos)
 537       {
 538          std::string home = filename.substr(1, filename.find('/') - 1);
 539          std::string pubhtml = filename.substr(filename.find('/') + 1);
 540          filename = "/home/" + home + "/public_html/" + pubhtml;
 541       }
 542       else
 543          filename = "/home/" + filename.substr(1) + "/public_html/";
 544    }
 545
 546    // if no filename is given, but a valid directory see if we can use an index or
 547    // have to resort to a autogenerated directory listing later on
 548    if (DirectoryExists(filename) == true)
 549    {
 550       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 551       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 552             RealFileExists(filename + directoryIndex) == true)
 553          filename += directoryIndex;
 554    }
 555
 556    return true;
 557 }
 558                                                                         /*}}}*/
 559 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request,/*{{{*/
 560       std::vector<std::string> parts, std::list<std::string> &headers)
 561 {
 562    size_t const pcount = parts.size();
 563    for (size_t i = 0; i < pcount; ++i)
 564       parts[i] = DeQuoteString(parts[i]);
 565    if (pcount == 4 && parts[1] == "set")
 566    {
 567       _config->Set(parts[2], parts[3]);
 568       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
 569       return true;
 570    }
 571    else if (pcount == 4 && parts[1] == "find")
 572    {
 573       std::string response = _config->Find(parts[2], parts[3]);
 574       addDataHeaders(headers, response);
 575       sendHead(client, 200, headers);
 576       sendData(client, headers, response);
 577       return true;
 578    }
 579    else if (pcount == 3 && parts[1] == "find")
 580    {
 581       if (_config->Exists(parts[2]) == true)
 582       {
 583          std::string response = _config->Find(parts[2]);
 584          addDataHeaders(headers, response);
 585          sendHead(client, 200, headers);
 586          sendData(client, headers, response);
 587          return true;
 588       }
 589       sendError(client, 404, request, true, "Requested Configuration option doesn't exist", headers);
 590       return false;
 591    }
 592    else if (pcount == 3 && parts[1] == "clear")
 593    {
 594       _config->Clear(parts[2]);
 595       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
 596       return true;
 597    }
 598
 599    sendError(client, 400, request, true, "Unknown on-the-fly configuration request", headers);
 600    return false;
 601 }
 602                                                                         /*}}}*/
 603 static void * handleClient(void * voidclient)                           /*{{{*/
 604 {
 605    int client = *((int*)(voidclient));
 606    std::clog << "ACCEPT client " << client << std::endl;
 607    bool closeConnection = false;
 608    while (closeConnection == false)
 609    {
 610       std::vector<std::string> messages;
 611       if (ReadMessages(client, messages) == false)
 612          break;
 613
 614       std::list<std::string> headers;
 615       for (std::vector<std::string>::const_iterator m = messages.begin();
 616             m != messages.end() && closeConnection == false; ++m) {
 617          // if we announced a closing in previous response, do the close now
 618          if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 619          {
 620             closeConnection = true;
 621             break;
 622          }
 623          headers.clear();
 624
 625          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 626             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 627          std::string filename;
 628          std::string params;
 629          bool sendContent = true;
 630          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection, headers) == false)
 631             continue;
 632
 633          // special webserver command request
 634          if (filename.length() > 1 && filename[0] == '_')
 635          {
 636             std::vector<std::string> parts = VectorizeString(filename, '/');
 637             if (parts[0] == "_config")
 638             {
 639                handleOnTheFlyReconfiguration(client, *m, parts, headers);
 640                continue;
 641             }
 642          }
 643
 644          // string replacements in the requested filename
 645          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 646          if (Replaces != NULL)
 647          {
 648             std::string redirect = "/" + filename;
 649             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 650                redirect = SubstVar(redirect, I->Tag, I->Value);
 651             if (redirect.empty() == false && redirect[0] == '/')
 652                redirect.erase(0,1);
 653             if (redirect != filename)
 654             {
 655                sendRedirect(client, 301, redirect, *m, sendContent);
 656                continue;
 657             }
 658          }
 659
 660          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 661          if (Overwrite != NULL)
 662          {
 663             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 664             {
 665                regex_t *pattern = new regex_t;
 666                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 667                if (res != 0)
 668                {
 669                   char error[300];
 670                   regerror(res, pattern, error, sizeof(error));
 671                   sendError(client, 500, *m, sendContent, error, headers);
 672                   continue;
 673                }
 674                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 675                {
 676                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 677                   if (filename[0] == '/')
 678                      filename.erase(0,1);
 679                   regfree(pattern);
 680                   break;
 681                }
 682                regfree(pattern);
 683             }
 684          }
 685
 686          // deal with the request
 687          unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 688          std::string hosthttpsport;
 689          strprintf(hosthttpsport, ":%u", httpsport);
 690          if (_config->FindB("aptwebserver::support::http", true) == false &&
 691                LookupTag(*m, "Host").find(hosthttpsport) == std::string::npos)
 692          {
 693             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
 694             continue;
 695          }
 696          else if (RealFileExists(filename) == true)
 697          {
 698             FileFd data(filename, FileFd::ReadOnly);
 699             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 700             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 701             {
 702                time_t cache;
 703                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 704                      cache >= data.ModificationTime())
 705                {
 706                   sendHead(client, 304, headers);
 707                   continue;
 708                }
 709             }
 710
 711             if (_config->FindB("aptwebserver::support::range", true) == true)
 712                condition = LookupTag(*m, "Range", "");
 713             else
 714                condition.clear();
 715             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 716             {
 717                time_t cache;
 718                std::string ifrange;
 719                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 720                   ifrange = LookupTag(*m, "If-Range", "");
 721                bool validrange = (ifrange.empty() == true ||
 722                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 723                       cache <= data.ModificationTime()));
 724
 725                // FIXME: support multiple byte-ranges (APT clients do not do this)
 726                if (condition.find(',') == std::string::npos)
 727                {
 728                   size_t start = 6;
 729                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 730                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 731                   size_t dash = condition.find('-') + 1;
 732                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 733                   unsigned long long filesize = data.FileSize();
 734                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 735                         validrange == true)
 736                   {
 737                      if (filesize > filestart)
 738                      {
 739                         data.Skip(filestart);
 740                         // make sure to send content-range before conent-length
 741                         // as regression test for LP: #1445239
 742                         std::ostringstream contentrange;
 743                         contentrange << "Content-Range: bytes " << filestart << "-"
 744                            << filesize - 1 << "/" << filesize;
 745                         headers.push_back(contentrange.str());
 746                         std::ostringstream contentlength;
 747                         contentlength << "Content-Length: " << (filesize - filestart);
 748                         headers.push_back(contentlength.str());
 749                         sendHead(client, 206, headers);
 750                         if (sendContent == true)
 751                            sendFile(client, headers, data);
 752                         continue;
 753                      }
 754                      else
 755                      {
 756                         if (_config->FindB("aptwebserver::support::content-range", true) == true)
 757                         {
 758                            std::ostringstream contentrange;
 759                            contentrange << "Content-Range: bytes */" << filesize;
 760                            headers.push_back(contentrange.str());
 761                         }
 762                         sendError(client, 416, *m, sendContent, "", headers);
 763                         break;
 764                      }
 765                   }
 766                }
 767             }
 768
 769             addFileHeaders(headers, data);
 770             sendHead(client, 200, headers);
 771             if (sendContent == true)
 772                sendFile(client, headers, data);
 773          }
 774          else if (DirectoryExists(filename) == true)
 775          {
 776             if (filename[filename.length()-1] == '/')
 777                sendDirectoryListing(client, filename, *m, sendContent, headers);
 778             else
 779                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 780          }
 781          else
 782             sendError(client, 404, *m, sendContent, "", headers);
 783       }
 784
 785       // if we announced a closing in the last response, do the close now
 786       if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 787          closeConnection = true;
 788
 789       if (_error->PendingError() == true)
 790          break;
 791       _error->DumpErrors(std::cerr);
 792    }
 793    _error->DumpErrors(std::cerr);
 794    close(client);
 795    std::clog << "CLOSE client " << client << std::endl;
 796    return NULL;
 797 }
 798                                                                         /*}}}*/
 799
 800 int main(int const argc, const char * argv[])
 801 {
 802    CommandLine::Args Args[] = {
 803       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 804       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 805       {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
 806       {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
 807       {'c',"config-file",0,CommandLine::ConfigFile},
 808       {'o',"option",0,CommandLine::ArbItem},
 809       {0,0,0,0}
 810    };
 811
 812    CommandLine CmdL(Args, _config);
 813    if(CmdL.Parse(argc,argv) == false)
 814    {
 815       _error->DumpErrors();
 816       exit(1);
 817    }
 818
 819    // create socket, bind and listen to it {{{
 820    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 821    signal(SIGPIPE, SIG_IGN);
 822    // we don't care for our slaves, so ignore their death
 823    signal(SIGCHLD, SIG_IGN);
 824
 825    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 826    if(sock < 0)
 827    {
 828       _error->Errno("aptwerbserver", "Couldn't create socket");
 829       _error->DumpErrors(std::cerr);
 830       return 1;
 831    }
 832
 833    int port = _config->FindI("aptwebserver::port", 8080);
 834
 835    // ensure that we accept all connections: v4 or v6
 836    int const iponly = 0;
 837    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 838    // to not linger on an address
 839    int const enable = 1;
 840    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 841
 842    struct sockaddr_in6 locAddr;
 843    memset(&locAddr, 0, sizeof(locAddr));
 844    locAddr.sin6_family = AF_INET6;
 845    locAddr.sin6_port = htons(port);
 846    locAddr.sin6_addr = in6addr_any;
 847
 848    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 849    {
 850       _error->Errno("aptwerbserver", "Couldn't bind");
 851       _error->DumpErrors(std::cerr);
 852       return 2;
 853    }
 854
 855    if (port == 0)
 856    {
 857       struct sockaddr_in6 addr;
 858       socklen_t addrlen = sizeof(sockaddr_in6);
 859       if (getsockname(sock, (struct sockaddr*) &addr, &addrlen) != 0)
 860          _error->Errno("getsockname", "Could not get chosen port number");
 861       else
 862          port = ntohs(addr.sin6_port);
 863    }
 864    std::string const portfilename = _config->Find("aptwebserver::portfile", "");
 865    if (portfilename.empty() == false)
 866    {
 867       FileFd portfile(portfilename, FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
 868       std::string portcontent;
 869       strprintf(portcontent, "%d", port);
 870       portfile.Write(portcontent.c_str(), portcontent.size());
 871       portfile.Sync();
 872    }
 873    _config->Set("aptwebserver::port::http", port);
 874
 875    FileFd pidfile;
 876    if (_config->FindB("aptwebserver::fork", false) == true)
 877    {
 878       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 879       int const pidfilefd = GetLock(pidfilename);
 880       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 881       {
 882          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 883          _error->DumpErrors(std::cerr);
 884          return 3;
 885       }
 886
 887       pid_t child = fork();
 888       if (child < 0)
 889       {
 890          _error->Errno("aptwebserver", "Forking failed");
 891          _error->DumpErrors(std::cerr);
 892          return 4;
 893       }
 894       else if (child != 0)
 895       {
 896          // successfully forked: ready to serve!
 897          std::string pidcontent;
 898          strprintf(pidcontent, "%d", child);
 899          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 900          pidfile.Sync();
 901          if (_error->PendingError() == true)
 902          {
 903             _error->DumpErrors(std::cerr);
 904             return 5;
 905          }
 906          std::cout << "Successfully forked as " << child << std::endl;
 907          return 0;
 908       }
 909    }
 910
 911    std::clog << "Serving ANY file on port: " << port << std::endl;
 912
 913    int const slaves = _config->FindI("aptwebserver::slaves", SOMAXCONN);
 914    std::cerr << "SLAVES: " << slaves << std::endl;
 915    listen(sock, slaves);
 916    /*}}}*/
 917
 918    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 919    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 920    _config->CndSet("aptwebserver::directoryindex", "index.html");
 921
 922    std::list<int> accepted_clients;
 923
 924    while (true)
 925    {
 926       int client = accept(sock, NULL, NULL);
 927       if (client == -1)
 928       {
 929          if (errno == EINTR)
 930             continue;
 931          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 932          _error->DumpErrors(std::cerr);
 933          return 6;
 934       }
 935
 936       pthread_attr_t attr;
 937       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 938       {
 939          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 940          _error->DumpErrors(std::cerr);
 941          close(client);
 942          continue;
 943       }
 944
 945       pthread_t tid;
 946       // thats rather dirty, but we need to store the client socket somewhere safe
 947       accepted_clients.push_front(client);
 948       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 949       {
 950          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 951          _error->DumpErrors(std::cerr);
 952          close(client);
 953          continue;
 954       }
 955    }
 956    pidfile.Close();
 957
 958    return 0;
 959 }