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 "Proxy Authentication Required";
  55       case 408: return "Request Time-out";
  56       case 409: return "Conflict";
  57       case 410: return "Gone";
  58       case 411: return "Length Required";
  59       case 412: return "Precondition Failed";
  60       case 413: return "Request Entity Too Large";
  61       case 414: return "Request-URI Too Large";
  62       case 415: return "Unsupported Media Type";
  63       case 416: return "Requested range not satisfiable";
  64       case 417: return "Expectation Failed";
  65       // Server error 5xx
  66       case 500: return "Internal Server Error";
  67       case 501: return "Not Implemented";
  68       case 502: return "Bad Gateway";
  69       case 503: return "Service Unavailable";
  70       case 504: return "Gateway Time-out";
  71       case 505: return "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) { /*{{{*/
 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    response.append("This error is a result of the request: <pre>");
 142    response.append(request).append("</pre></body></html>");
 143    addDataHeaders(headers, response);
 144    sendHead(client, httpcode, headers);
 145    if (content == true)
 146       sendData(client, response);
 147 }
 148                                                                         /*}}}*/
 149 // sendDirectoryLisiting                                                /*{{{*/
 150 int filter_hidden_files(const struct dirent *a) {
 151    if (a->d_name[0] == '.')
 152       return 0;
 153 #ifdef _DIRENT_HAVE_D_TYPE
 154    // if we have the d_type check that only files and dirs will be included
 155    if (a->d_type != DT_UNKNOWN &&
 156        a->d_type != DT_REG &&
 157        a->d_type != DT_LNK && // this includes links to regular files
 158        a->d_type != DT_DIR)
 159       return 0;
 160 #endif
 161    return 1;
 162 }
 163 int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 164 #ifdef _DIRENT_HAVE_D_TYPE
 165    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 166    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 167       return -1;
 168    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 169       return 1;
 170    else
 171 #endif
 172    {
 173       struct stat f_prop; //File's property
 174       stat((*a)->d_name, &f_prop);
 175       int const amode = f_prop.st_mode;
 176       stat((*b)->d_name, &f_prop);
 177       int const bmode = f_prop.st_mode;
 178       if (S_ISDIR(amode) && S_ISDIR(bmode));
 179       else if (S_ISDIR(amode))
 180          return -1;
 181       else if (S_ISDIR(bmode))
 182          return 1;
 183    }
 184    return strcasecmp((*a)->d_name, (*b)->d_name);
 185 }
 186 void sendDirectoryListing(int const client, std::string const &dir, std::string const &request, bool content) {
 187    std::list<std::string> headers;
 188    std::ostringstream listing;
 189
 190    struct dirent **namelist;
 191    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 192    if (counter == -1) {
 193       sendError(client, 500, request, content);
 194       return;
 195    }
 196
 197    listing << "<html><head><title>Index of " << dir << "</title>"
 198            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 199            << "tr:nth-child(even){background-color:#dfdfdf;}"
 200            << "h1, td:nth-child(3){text-align:center;}"
 201            << "table {margin-left:auto;margin-right:auto;} --></style>"
 202            << "</head>" << std::endl
 203            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 204            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 205    if (dir != ".")
 206       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 207    for (int i = 0; i < counter; ++i) {
 208       struct stat fs;
 209       std::string filename(dir);
 210       filename.append("/").append(namelist[i]->d_name);
 211       stat(filename.c_str(), &fs);
 212       listing << "<tr><td>" << ((S_ISDIR(fs.st_mode)) ? 'd' : 'f') << "</td>"
 213               << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>";
 214       if (S_ISDIR(fs.st_mode))
 215          listing << "<td>-</td>";
 216       else
 217          listing << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 218       listing << "<td>" << TimeRFC1123(fs.st_mtime) << "</td></tr>" << std::endl;
 219    }
 220    listing << "</table></body></html>" << std::endl;
 221
 222    std::string response(listing.str());
 223    addDataHeaders(headers, response);
 224    sendHead(client, 200, headers);
 225    if (content == true)
 226       sendData(client, response);
 227 }
 228                                                                         /*}}}*/
 229 int main(int const argc, const char * argv[])
 230 {
 231    CommandLine::Args Args[] = {
 232       {0, "simulate-paywall", "aptwebserver::Simulate-Paywall",
 233        CommandLine::Boolean},
 234       {0, "port", "aptwebserver::port", CommandLine::HasArg},
 235       {0,0,0,0}
 236    };
 237
 238    CommandLine CmdL(Args, _config);
 239    if(CmdL.Parse(argc,argv) == false) {
 240       _error->DumpErrors();
 241       exit(1);
 242    }
 243
 244    // create socket, bind and listen to it {{{
 245    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 246    if(sock < 0 ) {
 247       _error->Errno("aptwerbserver", "Couldn't create socket");
 248       _error->DumpErrors(std::cerr);
 249       return 1;
 250    }
 251
 252    // get the port
 253    int const port = _config->FindI("aptwebserver::port", 8080);
 254    bool const simulate_broken_server = _config->FindB("aptwebserver::Simulate-Paywall", false);
 255
 256    // ensure that we accept all connections: v4 or v6
 257    int const iponly = 0;
 258    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 259    // to not linger to an address
 260    int const enable = 1;
 261    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 262
 263    struct sockaddr_in6 locAddr;
 264    memset(&locAddr, 0, sizeof(locAddr));
 265    locAddr.sin6_family = AF_INET6;
 266    locAddr.sin6_port = htons(port);
 267    locAddr.sin6_addr = in6addr_any;
 268
 269    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0) {
 270       _error->Errno("aptwerbserver", "Couldn't bind");
 271       _error->DumpErrors(std::cerr);
 272       return 2;
 273    }
 274
 275    if (simulate_broken_server) {
 276       std::clog << "Simulating a broken web server that return nonsense "
 277                    "for all querries" << std::endl;
 278    } else {
 279       std::clog << "Serving ANY file on port: " << port << std::endl;
 280    }
 281
 282    listen(sock, 1);
 283    /*}}}*/
 284
 285    std::vector<std::string> messages;
 286    int client;
 287    while ((client = accept(sock, NULL, NULL)) != -1) {
 288       std::clog << "ACCEPT client " << client
 289                 << " on socket " << sock << std::endl;
 290
 291       while (ReadMessages(client, messages)) {
 292          for (std::vector<std::string>::const_iterator m = messages.begin();
 293               m != messages.end(); ++m) {
 294             std::clog << ">>> REQUEST >>>>" << std::endl << *m
 295                       << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 296             std::list<std::string> headers;
 297             bool sendContent = true;
 298             if (strncmp(m->c_str(), "HEAD ", 5) == 0)
 299                sendContent = false;
 300             if (strncmp(m->c_str(), "GET ", 4) != 0)
 301                sendError(client, 501, *m, true);
 302
 303             std::string host = LookupTag(*m, "Host", "");
 304             if (host.empty() == true) {
 305                // RFC 2616 §14.23 Host
 306                sendError(client, 400, *m, sendContent);
 307                continue;
 308             }
 309
 310             size_t const filestart = m->find(' ', 5);
 311             std::string filename = m->substr(5, filestart - 5);
 312             if (filename.empty() == true)
 313                filename = ".";
 314
 315             if (simulate_broken_server == true) {
 316                std::string data("ni ni ni\n");
 317                addDataHeaders(headers, data);
 318                sendHead(client, 200, headers);
 319                sendData(client, data);
 320             }
 321             else if (RealFileExists(filename) == true) {
 322                FileFd data(filename, FileFd::ReadOnly);
 323                std::string condition = LookupTag(*m, "If-Modified-Since", "");
 324                if (condition.empty() == false) {
 325                   time_t cache;
 326                   if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 327                       cache >= data.ModificationTime()) {
 328                      sendHead(client, 304, headers);
 329                      continue;
 330                   }
 331                }
 332                addFileHeaders(headers, data);
 333                sendHead(client, 200, headers);
 334                if (sendContent == true)
 335                   sendFile(client, data);
 336             }
 337             else if (DirectoryExists(filename) == true) {
 338                sendDirectoryListing(client, filename, *m, sendContent);
 339             }
 340             else
 341                sendError(client, 404, *m, false);
 342          }
 343          _error->DumpErrors(std::cerr);
 344          messages.clear();
 345       }
 346
 347       std::clog << "CLOSE client " << client
 348                 << " on socket " << sock << std::endl;
 349       close(client);
 350    }
 351    return 0;
 352 }