test/interactive-helper/aptwebserver.cc

   1 #include <config.h>
   2
   3 #include <apt-pkg/strutl.h>
   4 #include <apt-pkg/fileutl.h>
   5 #include <apt-pkg/error.h>
   6 #include <apt-pkg/cmndline.h>
   7 #include <apt-pkg/configuration.h>
   8 #include <apt-pkg/init.h>
   9
  10 #include <vector>
  11 #include <string>
  12 #include <list>
  13 #include <sstream>
  14
  15 #include <sys/socket.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <netinet/in.h>
  19 #include <unistd.h>
  20 #include <errno.h>
  21 #include <time.h>
  22 #include <stdlib.h>
  23 #include <dirent.h>
  24
  25 char const * const httpcodeToStr(int const httpcode) {                  /*{{{*/
  26    switch (httpcode) {
  27       // Informational 1xx
  28       case 100: return "100 Continue";
  29       case 101: return "101 Switching Protocols";
  30       // Successful 2xx
  31       case 200: return "200 OK";
  32       case 201: return "201 Created";
  33       case 202: return "202 Accepted";
  34       case 203: return "203 Non-Authoritative Information";
  35       case 204: return "204 No Content";
  36       case 205: return "205 Reset Content";
  37       case 206: return "206 Partial Conent";
  38       // Redirections 3xx
  39       case 300: return "300 Multiple Choices";
  40       case 301: return "301 Moved Permanently";
  41       case 302: return "302 Found";
  42       case 303: return "303 See Other";
  43       case 304: return "304 Not Modified";
  44       case 305: return "304 Use Proxy";
  45       case 307: return "307 Temporary Redirect";
  46       // Client errors 4xx
  47       case 400: return "400 Bad Request";
  48       case 401: return "401 Unauthorized";
  49       case 402: return "402 Payment Required";
  50       case 403: return "403 Forbidden";
  51       case 404: return "404 Not Found";
  52       case 405: return "405 Method Not Allowed";
  53       case 406: return "406 Not Acceptable";
  54       case 407: return "407 Proxy Authentication Required";
  55       case 408: return "408 Request Time-out";
  56       case 409: return "409 Conflict";
  57       case 410: return "410 Gone";
  58       case 411: return "411 Length Required";
  59       case 412: return "412 Precondition Failed";
  60       case 413: return "413 Request Entity Too Large";
  61       case 414: return "414 Request-URI Too Large";
  62       case 415: return "415 Unsupported Media Type";
  63       case 416: return "416 Requested range not satisfiable";
  64       case 417: return "417 Expectation Failed";
  65       // Server error 5xx
  66       case 500: return "500 Internal Server Error";
  67       case 501: return "501 Not Implemented";
  68       case 502: return "502 Bad Gateway";
  69       case 503: return "503 Service Unavailable";
  70       case 504: return "504 Gateway Time-out";
  71       case 505: return "505 HTTP Version not supported";
  72    }
  73    return NULL;
  74 }
  75                                                                         /*}}}*/
  76 void addFileHeaders(std::list<std::string> &headers, FileFd &data) {    /*{{{*/
  77    std::ostringstream contentlength;
  78    contentlength << "Content-Length: " << data.FileSize();
  79    headers.push_back(contentlength.str());
  80
  81    std::string lastmodified("Last-Modified: ");
  82    lastmodified.append(TimeRFC1123(data.ModificationTime()));
  83    headers.push_back(lastmodified);
  84 }
  85                                                                         /*}}}*/
  86 void addDataHeaders(std::list<std::string> &headers, std::string &data) {/*{{{*/
  87    std::ostringstream contentlength;
  88    contentlength << "Content-Length: " << data.size();
  89    headers.push_back(contentlength.str());
  90 }
  91                                                                         /*}}}*/
  92 bool sendHead(int const client, int const httpcode, std::list<std::string> &headers) { /*{{{*/
  93    std::string response("HTTP/1.1 ");
  94    response.append(httpcodeToStr(httpcode));
  95    headers.push_front(response);
  96
  97    headers.push_back("Server: APT webserver");
  98
  99    std::string date("Date: ");
 100    date.append(TimeRFC1123(time(NULL)));
 101    headers.push_back(date);
 102
 103    std::clog << ">>> RESPONSE >>>" << std::endl;
 104    bool Success = true;
 105    for (std::list<std::string>::const_iterator h = headers.begin();
 106         Success == true && h != headers.end(); ++h) {
 107       Success &= FileFd::Write(client, h->c_str(), h->size());
 108       Success &= FileFd::Write(client, "\r\n", 2);
 109       std::clog << *h << std::endl;
 110    }
 111    Success &= FileFd::Write(client, "\r\n", 2);
 112    std::clog << "<<<<<<<<<<<<<<<<" << std::endl;
 113    return Success;
 114 }
 115                                                                         /*}}}*/
 116 bool sendFile(int const client, FileFd &data) {                         /*{{{*/
 117    bool Success = true;
 118    char buffer[500];
 119    unsigned long long actual = 0;
 120    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true) {
 121       if (actual == 0)
 122          break;
 123       Success &= FileFd::Write(client, buffer, actual);
 124    }
 125    Success &= FileFd::Write(client, "\r\n", 2);
 126    return Success;
 127 }
 128                                                                         /*}}}*/
 129 bool sendData(int const client, std::string const &data) {              /*{{{*/
 130    bool Success = true;
 131    Success &= FileFd::Write(client, data.c_str(), data.size());
 132    Success &= FileFd::Write(client, "\r\n", 2);
 133    return Success;
 134 }
 135                                                                         /*}}}*/
 136 void sendError(int const client, int const httpcode, std::string const &request, bool content, std::string const &error = "") { /*{{{*/
 137    std::list<std::string> headers;
 138    std::string response("<html><head><title>");
 139    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 140    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 141    if (error.empty() == false)
 142       response.append("<p><em>Error</em>: ").append(error).append("</p>");
 143    response.append("This error is a result of the request: <pre>");
 144    response.append(request).append("</pre></body></html>");
 145    addDataHeaders(headers, response);
 146    sendHead(client, httpcode, headers);
 147    if (content == true)
 148       sendData(client, response);
 149 }
 150                                                                         /*}}}*/
 151 void sendRedirect(int const client, int const httpcode, std::string const &uri, std::string const &request, bool content) { /*{{{*/
 152    std::list<std::string> headers;
 153    std::string response("<html><head><title>");
 154    response.append(httpcodeToStr(httpcode)).append("</title></head>");
 155    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 156    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 157    response.append("This page is a result of the request: <pre>");
 158    response.append(request).append("</pre></body></html>");
 159    addDataHeaders(headers, response);
 160    std::string location("Location: ");
 161    if (strncmp(uri.c_str(), "http://", 7) != 0)
 162       location.append("http://").append(LookupTag(request, "Host")).append("/").append(uri);
 163    else
 164       location.append(uri);
 165    headers.push_back(location);
 166    sendHead(client, httpcode, headers);
 167    if (content == true)
 168       sendData(client, response);
 169 }
 170                                                                         /*}}}*/
 171 // sendDirectoryLisiting                                                /*{{{*/
 172 int filter_hidden_files(const struct dirent *a) {
 173    if (a->d_name[0] == '.')
 174       return 0;
 175 #ifdef _DIRENT_HAVE_D_TYPE
 176    // if we have the d_type check that only files and dirs will be included
 177    if (a->d_type != DT_UNKNOWN &&
 178        a->d_type != DT_REG &&
 179        a->d_type != DT_LNK && // this includes links to regular files
 180        a->d_type != DT_DIR)
 181       return 0;
 182 #endif
 183    return 1;
 184 }
 185 int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 186 #ifdef _DIRENT_HAVE_D_TYPE
 187    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 188    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 189       return -1;
 190    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 191       return 1;
 192    else
 193 #endif
 194    {
 195       struct stat f_prop; //File's property
 196       stat((*a)->d_name, &f_prop);
 197       int const amode = f_prop.st_mode;
 198       stat((*b)->d_name, &f_prop);
 199       int const bmode = f_prop.st_mode;
 200       if (S_ISDIR(amode) && S_ISDIR(bmode));
 201       else if (S_ISDIR(amode))
 202          return -1;
 203       else if (S_ISDIR(bmode))
 204          return 1;
 205    }
 206    return strcasecmp((*a)->d_name, (*b)->d_name);
 207 }
 208 void sendDirectoryListing(int const client, std::string const &dir, std::string const &request, bool content) {
 209    std::list<std::string> headers;
 210    std::ostringstream listing;
 211
 212    struct dirent **namelist;
 213    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 214    if (counter == -1) {
 215       sendError(client, 500, request, content);
 216       return;
 217    }
 218
 219    listing << "<html><head><title>Index of " << dir << "</title>"
 220            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 221            << "tr:nth-child(even){background-color:#dfdfdf;}"
 222            << "h1, td:nth-child(3){text-align:center;}"
 223            << "table {margin-left:auto;margin-right:auto;} --></style>"
 224            << "</head>" << std::endl
 225            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 226            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 227    if (dir != ".")
 228       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 229    for (int i = 0; i < counter; ++i) {
 230       struct stat fs;
 231       std::string filename(dir);
 232       filename.append("/").append(namelist[i]->d_name);
 233       stat(filename.c_str(), &fs);
 234       if (S_ISDIR(fs.st_mode)) {
 235          listing << "<tr><td>d</td>"
 236                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 237                  << "<td>-</td>";
 238       } else {
 239          listing << "<tr><td>f</td>"
 240                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 241                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 242       }
 243       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 244    }
 245    listing << "</table></body></html>" << std::endl;
 246
 247    std::string response(listing.str());
 248    addDataHeaders(headers, response);
 249    sendHead(client, 200, headers);
 250    if (content == true)
 251       sendData(client, response);
 252 }
 253                                                                         /*}}}*/
 254 bool parseFirstLine(int const client, std::string const &request, std::string &filename, bool &sendContent) { /*{{{*/
 255    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 256       sendContent = false;
 257    if (strncmp(request.c_str(), "GET ", 4) != 0)
 258    {
 259       sendError(client, 501, request, true);
 260       return false;
 261    }
 262
 263    size_t const lineend = request.find('\n');
 264    size_t filestart = request.find(' ');
 265    for (; request[filestart] == ' '; ++filestart);
 266    size_t fileend = request.rfind(' ', lineend);
 267    if (lineend == std::string::npos || filestart == std::string::npos ||
 268          fileend == std::string::npos || filestart == fileend) {
 269       sendError(client, 500, request, sendContent, "Filename can't be extracted");
 270       return false;
 271    }
 272
 273    size_t httpstart = fileend;
 274    for (; request[httpstart] == ' '; ++httpstart);
 275    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) != 0) {
 276       sendError(client, 500, request, sendContent, "Not an HTTP/1.1 request");
 277       return false;
 278    }
 279
 280    filename = request.substr(filestart, fileend - filestart);
 281    if (filename.find(' ') != std::string::npos) {
 282       sendError(client, 500, request, sendContent, "Filename contains an unencoded space");
 283       return false;
 284    }
 285    filename = DeQuoteString(filename);
 286
 287    // this is not a secure server, but at least prevent the obvious …
 288    if (filename.empty() == true || filename[0] != '/' ||
 289        strncmp(filename.c_str(), "//", 2) == 0 ||
 290        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 291        filename.find("/../") != std::string::npos) {
 292       sendError(client, 400, request, sendContent, "Filename contains illegal character (sequence)");
 293       return false;
 294    }
 295
 296    // nuke the first character which is a / as we assured above
 297    filename.erase(0, 1);
 298    if (filename.empty() == true)
 299       filename = ".";
 300    return true;
 301 }
 302                                                                         /*}}}*/
 303 int main(int const argc, const char * argv[])
 304 {
 305    CommandLine::Args Args[] = {
 306       {0, "simulate-paywall", "aptwebserver::Simulate-Paywall",
 307        CommandLine::Boolean},
 308       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 309       {'c',"config-file",0,CommandLine::ConfigFile},
 310       {'o',"option",0,CommandLine::ArbItem},
 311       {0,0,0,0}
 312    };
 313
 314    CommandLine CmdL(Args, _config);
 315    if(CmdL.Parse(argc,argv) == false) {
 316       _error->DumpErrors();
 317       exit(1);
 318    }
 319
 320    // create socket, bind and listen to it {{{
 321    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 322    if(sock < 0 ) {
 323       _error->Errno("aptwerbserver", "Couldn't create socket");
 324       _error->DumpErrors(std::cerr);
 325       return 1;
 326    }
 327
 328    // get the port
 329    int const port = _config->FindI("aptwebserver::port", 8080);
 330    bool const simulate_broken_server = _config->FindB("aptwebserver::Simulate-Paywall", false);
 331
 332    // ensure that we accept all connections: v4 or v6
 333    int const iponly = 0;
 334    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 335    // to not linger to an address
 336    int const enable = 1;
 337    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 338
 339    struct sockaddr_in6 locAddr;
 340    memset(&locAddr, 0, sizeof(locAddr));
 341    locAddr.sin6_family = AF_INET6;
 342    locAddr.sin6_port = htons(port);
 343    locAddr.sin6_addr = in6addr_any;
 344
 345    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0) {
 346       _error->Errno("aptwerbserver", "Couldn't bind");
 347       _error->DumpErrors(std::cerr);
 348       return 2;
 349    }
 350
 351    if (simulate_broken_server) {
 352       std::clog << "Simulating a broken web server that return nonsense "
 353                    "for all querries" << std::endl;
 354    } else {
 355       std::clog << "Serving ANY file on port: " << port << std::endl;
 356    }
 357
 358    listen(sock, 1);
 359    /*}}}*/
 360
 361    std::vector<std::string> messages;
 362    int client;
 363    while ((client = accept(sock, NULL, NULL)) != -1) {
 364       std::clog << "ACCEPT client " << client
 365                 << " on socket " << sock << std::endl;
 366
 367       while (ReadMessages(client, messages)) {
 368          for (std::vector<std::string>::const_iterator m = messages.begin();
 369               m != messages.end(); ++m) {
 370             std::clog << ">>> REQUEST >>>>" << std::endl << *m
 371                       << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 372
 373             std::list<std::string> headers;
 374             std::string filename;
 375             bool sendContent = true;
 376             if (parseFirstLine(client, *m, filename, sendContent) == false)
 377                continue;
 378
 379             std::string host = LookupTag(*m, "Host", "");
 380             if (host.empty() == true) {
 381                // RFC 2616 §14.23 requires Host
 382                sendError(client, 400, *m, sendContent, "Host header is required");
 383                continue;
 384             }
 385
 386             if (simulate_broken_server == true) {
 387                std::string data("ni ni ni\n");
 388                addDataHeaders(headers, data);
 389                sendHead(client, 200, headers);
 390                sendData(client, data);
 391             }
 392             else if (RealFileExists(filename) == true) {
 393                FileFd data(filename, FileFd::ReadOnly);
 394                std::string condition = LookupTag(*m, "If-Modified-Since", "");
 395                if (condition.empty() == false) {
 396                   time_t cache;
 397                   if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 398                       cache >= data.ModificationTime()) {
 399                      sendHead(client, 304, headers);
 400                      continue;
 401                   }
 402                }
 403                addFileHeaders(headers, data);
 404                sendHead(client, 200, headers);
 405                if (sendContent == true)
 406                   sendFile(client, data);
 407             }
 408             else if (DirectoryExists(filename) == true) {
 409                if (filename == "." || filename[filename.length()-1] == '/')
 410                   sendDirectoryListing(client, filename, *m, sendContent);
 411                else
 412                   sendRedirect(client, 301, filename.append("/"), *m, sendContent);
 413             }
 414             else
 415             {
 416                ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 417                if (Replaces != NULL) {
 418                   std::string redirect = "/" + filename;
 419                   for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 420                      redirect = SubstVar(redirect, I->Tag, I->Value);
 421                   redirect.erase(0,1);
 422                   if (redirect != filename) {
 423                      sendRedirect(client, 301, redirect, *m, sendContent);
 424                      continue;
 425                   }
 426                }
 427                sendError(client, 404, *m, sendContent);
 428             }
 429          }
 430          _error->DumpErrors(std::cerr);
 431          messages.clear();
 432       }
 433
 434       std::clog << "CLOSE client " << client
 435                 << " on socket " << sock << std::endl;
 436       close(client);
 437    }
 438    return 0;
 439 }