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(), false));
 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    auto const empties = _config->FindVector("aptwebserver::empty-response-header");
 126    for (auto && e: empties)
 127       buffer << e << ":" << std::endl;
 128    _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
 129    std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
 130    for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
 131       headers.push_back(*h);
 132
 133    std::string date("Date: ");
 134    date.append(TimeRFC1123(time(NULL), false));
 135    headers.push_back(date);
 136
 137    if (chunkedTransferEncoding(headers) == true)
 138       headers.push_back("Transfer-Encoding: chunked");
 139
 140    std::clog << ">>> RESPONSE to " << client << " >>>" << std::endl;
 141    bool Success = true;
 142    for (std::list<std::string>::const_iterator h = headers.begin();
 143         Success == true && h != headers.end(); ++h)
 144    {
 145       Success &= FileFd::Write(client, h->c_str(), h->size());
 146       if (Success == true)
 147          Success &= FileFd::Write(client, "\r\n", 2);
 148       std::clog << *h << std::endl;
 149    }
 150    if (Success == true)
 151       Success &= FileFd::Write(client, "\r\n", 2);
 152    std::clog << "<<<<<<<<<<<<<<<<" << std::endl;
 153    return Success;
 154 }
 155                                                                         /*}}}*/
 156 static bool sendFile(int const client, std::list<std::string> const &headers, FileFd &data)/*{{{*/
 157 {
 158    bool Success = true;
 159    bool const chunked = chunkedTransferEncoding(headers);
 160    char buffer[500];
 161    unsigned long long actual = 0;
 162    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
 163    {
 164       if (actual == 0)
 165          break;
 166
 167       if (chunked == true)
 168       {
 169          std::string size;
 170          strprintf(size, "%llX\r\n", actual);
 171          Success &= FileFd::Write(client, size.c_str(), size.size());
 172          Success &= FileFd::Write(client, buffer, actual);
 173          Success &= FileFd::Write(client, "\r\n", strlen("\r\n"));
 174       }
 175       else
 176          Success &= FileFd::Write(client, buffer, actual);
 177    }
 178    if (chunked == true)
 179    {
 180       char const * const finish = "0\r\n\r\n";
 181       Success &= FileFd::Write(client, finish, strlen(finish));
 182    }
 183    if (Success == false)
 184       std::cerr << "SENDFILE:" << (chunked ? " CHUNKED" : "") << " READ/WRITE ERROR to " << client << std::endl;
 185    return Success;
 186 }
 187                                                                         /*}}}*/
 188 static bool sendData(int const client, std::list<std::string> const &headers, std::string const &data)/*{{{*/
 189 {
 190    if (chunkedTransferEncoding(headers) == true)
 191    {
 192       unsigned long long const ullsize = data.length();
 193       std::string size;
 194       strprintf(size, "%llX\r\n", ullsize);
 195       char const * const finish = "\r\n0\r\n\r\n";
 196       if (FileFd::Write(client, size.c_str(), size.length()) == false ||
 197             FileFd::Write(client, data.c_str(), ullsize) == false ||
 198             FileFd::Write(client, finish, strlen(finish)) == false)
 199       {
 200          std::cerr << "SENDDATA: CHUNK WRITE ERROR to " << client << std::endl;
 201          return false;
 202       }
 203    }
 204    else if (FileFd::Write(client, data.c_str(), data.size()) == false)
 205    {
 206       std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
 207       return false;
 208    }
 209    return true;
 210 }
 211                                                                         /*}}}*/
 212 static void sendError(int const client, int const httpcode, std::string const &request,/*{{{*/
 213                bool const content, std::string const &error, std::list<std::string> &headers)
 214 {
 215    std::string response("<!doctype html><html><head><title>");
 216    response.append(httpcodeToStr(httpcode)).append("</title><meta charset=\"utf-8\" /></head>");
 217    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 218    if (httpcode != 200)
 219       response.append("<p><em>Error</em>: ");
 220    else
 221       response.append("<p><em>Success</em>: ");
 222    if (error.empty() == false)
 223       response.append(error);
 224    else
 225       response.append(httpcodeToStr(httpcode));
 226    if (httpcode != 200)
 227       response.append("</p>This error is a result of the request: <pre>");
 228    else
 229       response.append("The successfully executed operation was requested by: <pre>");
 230    response.append(request).append("</pre></body></html>");
 231    if (httpcode != 200)
 232    {
 233       if (_config->FindB("aptwebserver::closeOnError", false) == true)
 234          headers.push_back("Connection: close");
 235    }
 236    addDataHeaders(headers, response);
 237    sendHead(client, httpcode, headers);
 238    if (content == true)
 239       sendData(client, headers, response);
 240 }
 241 static void sendSuccess(int const client, std::string const &request,
 242                bool const content, std::string const &error, std::list<std::string> &headers)
 243 {
 244    sendError(client, 200, request, content, error, headers);
 245 }
 246                                                                         /*}}}*/
 247 static void sendRedirect(int const client, int const httpcode, std::string const &uri,/*{{{*/
 248                   std::string const &request, bool content)
 249 {
 250    std::list<std::string> headers;
 251    std::string response("<!doctype html><html><head><title>");
 252    response.append(httpcodeToStr(httpcode)).append("</title><meta charset=\"utf-8\" /></head>");
 253    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 254    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 255    response.append("This page is a result of the request: <pre>");
 256    response.append(request).append("</pre></body></html>");
 257    addDataHeaders(headers, response);
 258    std::string location("Location: ");
 259    if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
 260    {
 261       std::string const host = LookupTag(request, "Host");
 262       unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 263       std::string hosthttpsport;
 264       strprintf(hosthttpsport, ":%u", httpsport);
 265       if (host.find(hosthttpsport) != std::string::npos)
 266          location.append("https://");
 267       else
 268          location.append("http://");
 269       location.append(host).append("/");
 270       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 271       {
 272          std::string homeuri = SubstVar(uri, "/home/", "~");
 273          homeuri = SubstVar(homeuri, "/public_html/", "/");
 274          location.append(homeuri);
 275       }
 276       else
 277          location.append(uri);
 278    }
 279    else
 280       location.append(uri);
 281    headers.push_back(location);
 282    sendHead(client, httpcode, headers);
 283    if (content == true)
 284       sendData(client, headers, response);
 285 }
 286                                                                         /*}}}*/
 287 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 288 {
 289    if (a->d_name[0] == '.')
 290       return 0;
 291 #ifdef _DIRENT_HAVE_D_TYPE
 292    // if we have the d_type check that only files and dirs will be included
 293    if (a->d_type != DT_UNKNOWN &&
 294        a->d_type != DT_REG &&
 295        a->d_type != DT_LNK && // this includes links to regular files
 296        a->d_type != DT_DIR)
 297       return 0;
 298 #endif
 299    return 1;
 300 }
 301 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 302 #ifdef _DIRENT_HAVE_D_TYPE
 303    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 304    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 305       return -1;
 306    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 307       return 1;
 308    else
 309 #endif
 310    {
 311       struct stat f_prop; //File's property
 312       stat((*a)->d_name, &f_prop);
 313       int const amode = f_prop.st_mode;
 314       stat((*b)->d_name, &f_prop);
 315       int const bmode = f_prop.st_mode;
 316       if (S_ISDIR(amode) && S_ISDIR(bmode));
 317       else if (S_ISDIR(amode))
 318          return -1;
 319       else if (S_ISDIR(bmode))
 320          return 1;
 321    }
 322    return strcasecmp((*a)->d_name, (*b)->d_name);
 323 }
 324                                                                         /*}}}*/
 325 static void sendDirectoryListing(int const client, std::string const &dir,/*{{{*/
 326                           std::string const &request, bool content, std::list<std::string> &headers)
 327 {
 328    std::ostringstream listing;
 329
 330    struct dirent **namelist;
 331    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 332    if (counter == -1)
 333    {
 334       sendError(client, 500, request, content, "scandir failed", headers);
 335       return;
 336    }
 337
 338    listing << "<!doctype html><html><head><title>Index of " << dir << "</title><meta charset=\"utf-8\" />"
 339            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 340            << "tr:nth-child(even){background-color:#dfdfdf;}"
 341            << "h1, td:nth-child(3){text-align:center;}"
 342            << "table {margin-left:auto;margin-right:auto;} --></style>"
 343            << "</head>" << std::endl
 344            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 345            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 346    if (dir != "./")
 347       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 348    for (int i = 0; i < counter; ++i) {
 349       struct stat fs;
 350       std::string filename(dir);
 351       filename.append("/").append(namelist[i]->d_name);
 352       stat(filename.c_str(), &fs);
 353       if (S_ISDIR(fs.st_mode))
 354       {
 355          listing << "<tr><td>d</td>"
 356                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 357                  << "<td>-</td>";
 358       }
 359       else
 360       {
 361          listing << "<tr><td>f</td>"
 362                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 363                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 364       }
 365       listing << "<td>" << TimeRFC1123(fs.st_mtime, true) << "</td></tr>" << std::endl;
 366    }
 367    listing << "</table></body></html>" << std::endl;
 368
 369    std::string response(listing.str());
 370    addDataHeaders(headers, response);
 371    sendHead(client, 200, headers);
 372    if (content == true)
 373       sendData(client, headers, response);
 374 }
 375                                                                         /*}}}*/
 376 static bool parseFirstLine(int const client, std::string const &request,/*{{{*/
 377                     std::string &filename, std::string &params, bool &sendContent,
 378                     bool &closeConnection, std::list<std::string> &headers)
 379 {
 380    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 381       sendContent = false;
 382    if (strncmp(request.c_str(), "GET ", 4) != 0)
 383    {
 384       sendError(client, 501, request, true, "", headers);
 385       return false;
 386    }
 387
 388    size_t const lineend = request.find('\n');
 389    size_t filestart = request.find(' ');
 390    for (; request[filestart] == ' '; ++filestart);
 391    size_t fileend = request.rfind(' ', lineend);
 392    if (lineend == std::string::npos || filestart == std::string::npos ||
 393          fileend == std::string::npos || filestart == fileend)
 394    {
 395       sendError(client, 500, request, sendContent, "Filename can't be extracted", headers);
 396       return false;
 397    }
 398
 399    size_t httpstart = fileend;
 400    for (; request[httpstart] == ' '; ++httpstart);
 401    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 402       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 403    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 404       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 405    else
 406    {
 407       sendError(client, 500, request, sendContent, "Not a HTTP/1.{0,1} request", headers);
 408       return false;
 409    }
 410
 411    filename = request.substr(filestart, fileend - filestart);
 412    if (filename.find(' ') != std::string::npos)
 413    {
 414       sendError(client, 500, request, sendContent, "Filename contains an unencoded space", headers);
 415       return false;
 416    }
 417
 418    std::string host = LookupTag(request, "Host", "");
 419    if (host.empty() == true)
 420    {
 421       // RFC 2616 §14.23 requires Host
 422       sendError(client, 400, request, sendContent, "Host header is required", headers);
 423       return false;
 424    }
 425    host = "http://" + host;
 426
 427    // Proxies require absolute uris, so this is a simple proxy-fake option
 428    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 429    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
 430    {
 431       if (absolute.find("uri") == std::string::npos)
 432       {
 433          sendError(client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
 434          return false;
 435       }
 436
 437       // strip the host from the request to make it an absolute path
 438       filename.erase(0, host.length());
 439
 440       std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
 441       std::string auth = LookupTag(request, "Proxy-Authorization", "");
 442       if (authConf.empty() != auth.empty())
 443       {
 444          if (auth.empty())
 445             sendError(client, 407, request, sendContent, "Proxy requires authentication", headers);
 446          else
 447             sendError(client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
 448         return false;
 449       }
 450       if (authConf.empty() == false)
 451       {
 452          char const * const basic = "Basic ";
 453          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 454          {
 455             auth.erase(0, strlen(basic));
 456             if (auth != authConf)
 457             {
 458                sendError(client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
 459                return false;
 460             }
 461          }
 462          else
 463          {
 464             std::list<std::string> headers;
 465             headers.push_back("Proxy-Authenticate: Basic");
 466             sendError(client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
 467             return false;
 468          }
 469       }
 470    }
 471    else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
 472    {
 473       sendError(client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
 474       return false;
 475    }
 476
 477    if (APT::String::Startswith(filename, "/_config/") == false)
 478    {
 479       std::string const authConf = _config->Find("aptwebserver::authorization", "");
 480       std::string auth = LookupTag(request, "Authorization", "");
 481       if (authConf.empty() != auth.empty())
 482       {
 483          if (auth.empty())
 484             sendError(client, 401, request, sendContent, "Server requires authentication", headers);
 485          else
 486             sendError(client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
 487          return false;
 488       }
 489       if (authConf.empty() == false)
 490       {
 491          char const * const basic = "Basic ";
 492          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 493          {
 494             auth.erase(0, strlen(basic));
 495             if (auth != authConf)
 496             {
 497                sendError(client, 401, request, sendContent, "Authentication doesn't match", headers);
 498                return false;
 499             }
 500          }
 501          else
 502          {
 503             headers.push_back("WWW-Authenticate: Basic");
 504             sendError(client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
 505             return false;
 506          }
 507       }
 508    }
 509
 510    size_t paramspos = filename.find('?');
 511    if (paramspos != std::string::npos)
 512    {
 513       params = filename.substr(paramspos + 1);
 514       filename.erase(paramspos);
 515    }
 516
 517    filename = DeQuoteString(filename);
 518
 519    // this is not a secure server, but at least prevent the obvious …
 520    if (filename.empty() == true || filename[0] != '/' ||
 521        strncmp(filename.c_str(), "//", 2) == 0 ||
 522        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 523        filename.find("/../") != std::string::npos)
 524    {
 525       std::list<std::string> headers;
 526       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
 527       return false;
 528    }
 529
 530    // nuke the first character which is a / as we assured above
 531    filename.erase(0, 1);
 532    if (filename.empty() == true)
 533       filename = "./";
 534    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 535    else if (filename[0] == '~')
 536    {
 537       // /home/user is actually not entirely correct, but good enough for now
 538       size_t dashpos = filename.find('/');
 539       if (dashpos != std::string::npos)
 540       {
 541          std::string home = filename.substr(1, filename.find('/') - 1);
 542          std::string pubhtml = filename.substr(filename.find('/') + 1);
 543          filename = "/home/" + home + "/public_html/" + pubhtml;
 544       }
 545       else
 546          filename = "/home/" + filename.substr(1) + "/public_html/";
 547    }
 548
 549    // if no filename is given, but a valid directory see if we can use an index or
 550    // have to resort to a autogenerated directory listing later on
 551    if (DirectoryExists(filename) == true)
 552    {
 553       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 554       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 555             RealFileExists(filename + directoryIndex) == true)
 556          filename += directoryIndex;
 557    }
 558
 559    return true;
 560 }
 561                                                                         /*}}}*/
 562 static bool handleOnTheFlyReconfiguration(int const client, std::string const &request,/*{{{*/
 563       std::vector<std::string> parts, std::list<std::string> &headers)
 564 {
 565    size_t const pcount = parts.size();
 566    for (size_t i = 0; i < pcount; ++i)
 567       parts[i] = DeQuoteString(parts[i]);
 568    if (pcount == 4 && parts[1] == "set")
 569    {
 570       _config->Set(parts[2], parts[3]);
 571       sendSuccess(client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
 572       return true;
 573    }
 574    else if (pcount == 4 && parts[1] == "find")
 575    {
 576       std::string response = _config->Find(parts[2], parts[3]);
 577       addDataHeaders(headers, response);
 578       sendHead(client, 200, headers);
 579       sendData(client, headers, response);
 580       return true;
 581    }
 582    else if (pcount == 3 && parts[1] == "find")
 583    {
 584       if (_config->Exists(parts[2]) == true)
 585       {
 586          std::string response = _config->Find(parts[2]);
 587          addDataHeaders(headers, response);
 588          sendHead(client, 200, headers);
 589          sendData(client, headers, response);
 590          return true;
 591       }
 592       sendError(client, 404, request, true, "Requested Configuration option doesn't exist", headers);
 593       return false;
 594    }
 595    else if (pcount == 3 && parts[1] == "clear")
 596    {
 597       _config->Clear(parts[2]);
 598       sendSuccess(client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
 599       return true;
 600    }
 601
 602    sendError(client, 400, request, true, "Unknown on-the-fly configuration request", headers);
 603    return false;
 604 }
 605                                                                         /*}}}*/
 606 static void * handleClient(void * voidclient)                           /*{{{*/
 607 {
 608    int client = *((int*)(voidclient));
 609    std::clog << "ACCEPT client " << client << std::endl;
 610    bool closeConnection = false;
 611    while (closeConnection == false)
 612    {
 613       std::vector<std::string> messages;
 614       if (ReadMessages(client, messages) == false)
 615          break;
 616
 617       std::list<std::string> headers;
 618       for (std::vector<std::string>::const_iterator m = messages.begin();
 619             m != messages.end() && closeConnection == false; ++m) {
 620          // if we announced a closing in previous response, do the close now
 621          if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 622          {
 623             closeConnection = true;
 624             break;
 625          }
 626          headers.clear();
 627
 628          std::clog << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 629             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 630          std::string filename;
 631          std::string params;
 632          bool sendContent = true;
 633          if (parseFirstLine(client, *m, filename, params, sendContent, closeConnection, headers) == false)
 634             continue;
 635
 636          // special webserver command request
 637          if (filename.length() > 1 && filename[0] == '_')
 638          {
 639             std::vector<std::string> parts = VectorizeString(filename, '/');
 640             if (parts[0] == "_config")
 641             {
 642                handleOnTheFlyReconfiguration(client, *m, parts, headers);
 643                continue;
 644             }
 645          }
 646
 647          // string replacements in the requested filename
 648          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 649          if (Replaces != NULL)
 650          {
 651             std::string redirect = "/" + filename;
 652             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 653                redirect = SubstVar(redirect, I->Tag, I->Value);
 654             if (redirect.empty() == false && redirect[0] == '/')
 655                redirect.erase(0,1);
 656             if (redirect != filename)
 657             {
 658                sendRedirect(client, _config->FindI("aptwebserver::redirect::httpcode", 301), redirect, *m, sendContent);
 659                continue;
 660             }
 661          }
 662
 663          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 664          if (Overwrite != NULL)
 665          {
 666             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 667             {
 668                regex_t *pattern = new regex_t;
 669                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 670                if (res != 0)
 671                {
 672                   char error[300];
 673                   regerror(res, pattern, error, sizeof(error));
 674                   sendError(client, 500, *m, sendContent, error, headers);
 675                   continue;
 676                }
 677                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 678                {
 679                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 680                   if (filename[0] == '/')
 681                      filename.erase(0,1);
 682                   regfree(pattern);
 683                   break;
 684                }
 685                regfree(pattern);
 686             }
 687          }
 688
 689          // deal with the request
 690          unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 691          std::string hosthttpsport;
 692          strprintf(hosthttpsport, ":%u", httpsport);
 693          if (_config->FindB("aptwebserver::support::http", true) == false &&
 694                LookupTag(*m, "Host").find(hosthttpsport) == std::string::npos)
 695          {
 696             sendError(client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
 697             continue;
 698          }
 699          else if (RealFileExists(filename) == true)
 700          {
 701             FileFd data(filename, FileFd::ReadOnly);
 702             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 703             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 704             {
 705                time_t cache;
 706                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 707                      cache >= data.ModificationTime())
 708                {
 709                   sendHead(client, 304, headers);
 710                   continue;
 711                }
 712             }
 713
 714             if (_config->FindB("aptwebserver::support::range", true) == true)
 715                condition = LookupTag(*m, "Range", "");
 716             else
 717                condition.clear();
 718             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 719             {
 720                time_t cache;
 721                std::string ifrange;
 722                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 723                   ifrange = LookupTag(*m, "If-Range", "");
 724                bool validrange = (ifrange.empty() == true ||
 725                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 726                       cache <= data.ModificationTime()));
 727
 728                // FIXME: support multiple byte-ranges (APT clients do not do this)
 729                if (condition.find(',') == std::string::npos)
 730                {
 731                   size_t start = 6;
 732                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 733                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 734                   size_t dash = condition.find('-') + 1;
 735                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 736                   unsigned long long filesize = data.FileSize();
 737                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 738                         validrange == true)
 739                   {
 740                      if (filesize > filestart)
 741                      {
 742                         data.Skip(filestart);
 743                         // make sure to send content-range before conent-length
 744                         // as regression test for LP: #1445239
 745                         std::ostringstream contentrange;
 746                         contentrange << "Content-Range: bytes " << filestart << "-"
 747                            << filesize - 1 << "/" << filesize;
 748                         headers.push_back(contentrange.str());
 749                         std::ostringstream contentlength;
 750                         contentlength << "Content-Length: " << (filesize - filestart);
 751                         headers.push_back(contentlength.str());
 752                         sendHead(client, 206, headers);
 753                         if (sendContent == true)
 754                            sendFile(client, headers, data);
 755                         continue;
 756                      }
 757                      else
 758                      {
 759                         if (_config->FindB("aptwebserver::support::content-range", true) == true)
 760                         {
 761                            std::ostringstream contentrange;
 762                            contentrange << "Content-Range: bytes */" << filesize;
 763                            headers.push_back(contentrange.str());
 764                         }
 765                         sendError(client, 416, *m, sendContent, "", headers);
 766                         continue;
 767                      }
 768                   }
 769                }
 770             }
 771
 772             addFileHeaders(headers, data);
 773             sendHead(client, 200, headers);
 774             if (sendContent == true)
 775                sendFile(client, headers, data);
 776          }
 777          else if (DirectoryExists(filename) == true)
 778          {
 779             if (filename[filename.length()-1] == '/')
 780                sendDirectoryListing(client, filename, *m, sendContent, headers);
 781             else
 782                sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 783          }
 784          else
 785             sendError(client, 404, *m, sendContent, "", headers);
 786       }
 787
 788       // if we announced a closing in the last response, do the close now
 789       if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 790          closeConnection = true;
 791
 792       if (_error->PendingError() == true)
 793          break;
 794       _error->DumpErrors(std::cerr);
 795    }
 796    _error->DumpErrors(std::cerr);
 797    close(client);
 798    std::clog << "CLOSE client " << client << std::endl;
 799    return NULL;
 800 }
 801                                                                         /*}}}*/
 802
 803 int main(int const argc, const char * argv[])
 804 {
 805    CommandLine::Args Args[] = {
 806       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 807       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 808       {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
 809       {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
 810       {'c',"config-file",0,CommandLine::ConfigFile},
 811       {'o',"option",0,CommandLine::ArbItem},
 812       {0,0,0,0}
 813    };
 814
 815    CommandLine CmdL(Args, _config);
 816    if(CmdL.Parse(argc,argv) == false)
 817    {
 818       _error->DumpErrors();
 819       exit(1);
 820    }
 821
 822    // create socket, bind and listen to it {{{
 823    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 824    signal(SIGPIPE, SIG_IGN);
 825    // we don't care for our slaves, so ignore their death
 826    signal(SIGCHLD, SIG_IGN);
 827
 828    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 829    if(sock < 0)
 830    {
 831       _error->Errno("aptwerbserver", "Couldn't create socket");
 832       _error->DumpErrors(std::cerr);
 833       return 1;
 834    }
 835
 836    int port = _config->FindI("aptwebserver::port", 8080);
 837
 838    // ensure that we accept all connections: v4 or v6
 839    int const iponly = 0;
 840    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 841    // to not linger on an address
 842    int const enable = 1;
 843    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 844
 845    struct sockaddr_in6 locAddr;
 846    memset(&locAddr, 0, sizeof(locAddr));
 847    locAddr.sin6_family = AF_INET6;
 848    locAddr.sin6_port = htons(port);
 849    locAddr.sin6_addr = in6addr_any;
 850
 851    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 852    {
 853       _error->Errno("aptwerbserver", "Couldn't bind");
 854       _error->DumpErrors(std::cerr);
 855       return 2;
 856    }
 857
 858    if (port == 0)
 859    {
 860       struct sockaddr_in6 addr;
 861       socklen_t addrlen = sizeof(sockaddr_in6);
 862       if (getsockname(sock, (struct sockaddr*) &addr, &addrlen) != 0)
 863          _error->Errno("getsockname", "Could not get chosen port number");
 864       else
 865          port = ntohs(addr.sin6_port);
 866    }
 867    std::string const portfilename = _config->Find("aptwebserver::portfile", "");
 868    if (portfilename.empty() == false)
 869    {
 870       FileFd portfile(portfilename, FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
 871       std::string portcontent;
 872       strprintf(portcontent, "%d", port);
 873       portfile.Write(portcontent.c_str(), portcontent.size());
 874       portfile.Sync();
 875    }
 876    _config->Set("aptwebserver::port::http", port);
 877
 878    FileFd pidfile;
 879    if (_config->FindB("aptwebserver::fork", false) == true)
 880    {
 881       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 882       int const pidfilefd = GetLock(pidfilename);
 883       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 884       {
 885          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 886          _error->DumpErrors(std::cerr);
 887          return 3;
 888       }
 889
 890       pid_t child = fork();
 891       if (child < 0)
 892       {
 893          _error->Errno("aptwebserver", "Forking failed");
 894          _error->DumpErrors(std::cerr);
 895          return 4;
 896       }
 897       else if (child != 0)
 898       {
 899          // successfully forked: ready to serve!
 900          std::string pidcontent;
 901          strprintf(pidcontent, "%d", child);
 902          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 903          pidfile.Sync();
 904          if (_error->PendingError() == true)
 905          {
 906             _error->DumpErrors(std::cerr);
 907             return 5;
 908          }
 909          std::cout << "Successfully forked as " << child << std::endl;
 910          return 0;
 911       }
 912    }
 913
 914    std::clog << "Serving ANY file on port: " << port << std::endl;
 915
 916    int const slaves = _config->FindI("aptwebserver::slaves", SOMAXCONN);
 917    std::cerr << "SLAVES: " << slaves << std::endl;
 918    listen(sock, slaves);
 919    /*}}}*/
 920
 921    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 922    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 923    _config->CndSet("aptwebserver::directoryindex", "index.html");
 924
 925    std::list<int> accepted_clients;
 926
 927    while (true)
 928    {
 929       int client = accept(sock, NULL, NULL);
 930       if (client == -1)
 931       {
 932          if (errno == EINTR)
 933             continue;
 934          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 935          _error->DumpErrors(std::cerr);
 936          return 6;
 937       }
 938
 939       pthread_attr_t attr;
 940       if (pthread_attr_init(&attr) != 0 || pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 941       {
 942          _error->Errno("pthread_attr", "Couldn't set detach attribute for a fresh thread to handle client %d on socket %d", client, sock);
 943          _error->DumpErrors(std::cerr);
 944          close(client);
 945          continue;
 946       }
 947
 948       pthread_t tid;
 949       // thats rather dirty, but we need to store the client socket somewhere safe
 950       accepted_clients.push_front(client);
 951       if (pthread_create(&tid, &attr, &handleClient, &(*accepted_clients.begin())) != 0)
 952       {
 953          _error->Errno("pthread_create", "Couldn't create a fresh thread to handle client %d on socket %d", client, sock);
 954          _error->DumpErrors(std::cerr);
 955          close(client);
 956          continue;
 957       }
 958    }
 959    pidfile.Close();
 960
 961    return 0;
 962 }