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 "teestream.h"
  10
  11 #include <dirent.h>
  12 #include <errno.h>
  13 #include <netinet/in.h>
  14 #include <pthread.h>
  15 #include <regex.h>
  16 #include <signal.h>
  17 #include <stddef.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/socket.h>
  21 #include <sys/stat.h>
  22 #include <time.h>
  23 #include <unistd.h>
  24
  25 #include <algorithm>
  26 #include <iostream>
  27 #include <fstream>
  28 #include <sstream>
  29 #include <list>
  30 #include <string>
  31 #include <thread>
  32 #include <vector>
  33
  34 static std::string httpcodeToStr(int const httpcode)                    /*{{{*/
  35 {
  36    switch (httpcode)
  37    {
  38       // Informational 1xx
  39       case 100: return _config->Find("aptwebserver::httpcode::100", "100 Continue");
  40       case 101: return _config->Find("aptwebserver::httpcode::101", "101 Switching Protocols");
  41       // Successful 2xx
  42       case 200: return _config->Find("aptwebserver::httpcode::200", "200 OK");
  43       case 201: return _config->Find("aptwebserver::httpcode::201", "201 Created");
  44       case 202: return _config->Find("aptwebserver::httpcode::202", "202 Accepted");
  45       case 203: return _config->Find("aptwebserver::httpcode::203", "203 Non-Authoritative Information");
  46       case 204: return _config->Find("aptwebserver::httpcode::204", "204 No Content");
  47       case 205: return _config->Find("aptwebserver::httpcode::205", "205 Reset Content");
  48       case 206: return _config->Find("aptwebserver::httpcode::206", "206 Partial Content");
  49       // Redirections 3xx
  50       case 300: return _config->Find("aptwebserver::httpcode::300", "300 Multiple Choices");
  51       case 301: return _config->Find("aptwebserver::httpcode::301", "301 Moved Permanently");
  52       case 302: return _config->Find("aptwebserver::httpcode::302", "302 Found");
  53       case 303: return _config->Find("aptwebserver::httpcode::303", "303 See Other");
  54       case 304: return _config->Find("aptwebserver::httpcode::304", "304 Not Modified");
  55       case 305: return _config->Find("aptwebserver::httpcode::305", "305 Use Proxy");
  56       case 307: return _config->Find("aptwebserver::httpcode::307", "307 Temporary Redirect");
  57       // Client errors 4xx
  58       case 400: return _config->Find("aptwebserver::httpcode::400", "400 Bad Request");
  59       case 401: return _config->Find("aptwebserver::httpcode::401", "401 Unauthorized");
  60       case 402: return _config->Find("aptwebserver::httpcode::402", "402 Payment Required");
  61       case 403: return _config->Find("aptwebserver::httpcode::403", "403 Forbidden");
  62       case 404: return _config->Find("aptwebserver::httpcode::404", "404 Not Found");
  63       case 405: return _config->Find("aptwebserver::httpcode::405", "405 Method Not Allowed");
  64       case 406: return _config->Find("aptwebserver::httpcode::406", "406 Not Acceptable");
  65       case 407: return _config->Find("aptwebserver::httpcode::407", "407 Proxy Authentication Required");
  66       case 408: return _config->Find("aptwebserver::httpcode::408", "408 Request Time-out");
  67       case 409: return _config->Find("aptwebserver::httpcode::409", "409 Conflict");
  68       case 410: return _config->Find("aptwebserver::httpcode::410", "410 Gone");
  69       case 411: return _config->Find("aptwebserver::httpcode::411", "411 Length Required");
  70       case 412: return _config->Find("aptwebserver::httpcode::412", "412 Precondition Failed");
  71       case 413: return _config->Find("aptwebserver::httpcode::413", "413 Request Entity Too Large");
  72       case 414: return _config->Find("aptwebserver::httpcode::414", "414 Request-URI Too Large");
  73       case 415: return _config->Find("aptwebserver::httpcode::415", "415 Unsupported Media Type");
  74       case 416: return _config->Find("aptwebserver::httpcode::416", "416 Requested range not satisfiable");
  75       case 417: return _config->Find("aptwebserver::httpcode::417", "417 Expectation Failed");
  76       case 418: return _config->Find("aptwebserver::httpcode::418", "418 I'm a teapot");
  77       // Server error 5xx
  78       case 500: return _config->Find("aptwebserver::httpcode::500", "500 Internal Server Error");
  79       case 501: return _config->Find("aptwebserver::httpcode::501", "501 Not Implemented");
  80       case 502: return _config->Find("aptwebserver::httpcode::502", "502 Bad Gateway");
  81       case 503: return _config->Find("aptwebserver::httpcode::503", "503 Service Unavailable");
  82       case 504: return _config->Find("aptwebserver::httpcode::504", "504 Gateway Time-out");
  83       case 505: return _config->Find("aptwebserver::httpcode::505", "505 HTTP Version not supported");
  84    }
  85    return "";
  86 }
  87                                                                         /*}}}*/
  88 static bool chunkedTransferEncoding(std::list<std::string> const &headers) {
  89    if (std::find(headers.begin(), headers.end(), "Transfer-Encoding: chunked") != headers.end())
  90       return true;
  91    if (_config->FindB("aptwebserver::chunked-transfer-encoding", false) == true)
  92       return true;
  93    return false;
  94 }
  95 static void addFileHeaders(std::list<std::string> &headers, FileFd &data)/*{{{*/
  96 {
  97    if (chunkedTransferEncoding(headers) == false)
  98    {
  99       std::ostringstream contentlength;
 100       contentlength << "Content-Length: " << data.FileSize();
 101       headers.push_back(contentlength.str());
 102    }
 103    if (_config->FindB("aptwebserver::support::last-modified", true) == true)
 104    {
 105       std::string lastmodified("Last-Modified: ");
 106       lastmodified.append(TimeRFC1123(data.ModificationTime(), false));
 107       headers.push_back(lastmodified);
 108    }
 109 }
 110                                                                         /*}}}*/
 111 static void addDataHeaders(std::list<std::string> &headers, std::string &data)/*{{{*/
 112 {
 113    if (chunkedTransferEncoding(headers) == false)
 114    {
 115       std::ostringstream contentlength;
 116       contentlength << "Content-Length: " << data.size();
 117       headers.push_back(contentlength.str());
 118    }
 119 }
 120                                                                         /*}}}*/
 121 static bool sendHead(std::ostream &log, int const client, int const httpcode, std::list<std::string> &headers)/*{{{*/
 122 {
 123    std::string response("HTTP/1.1 ");
 124    response.append(httpcodeToStr(httpcode));
 125    headers.push_front(response);
 126    _config->Set("APTWebserver::Last-Status-Code", httpcode);
 127
 128    std::stringstream buffer;
 129    auto const empties = _config->FindVector("aptwebserver::empty-response-header");
 130    for (auto && e: empties)
 131       buffer << e << ":" << std::endl;
 132    _config->Dump(buffer, "aptwebserver::response-header", "%t: %v%n", false);
 133    std::vector<std::string> addheaders = VectorizeString(buffer.str(), '\n');
 134    for (std::vector<std::string>::const_iterator h = addheaders.begin(); h != addheaders.end(); ++h)
 135       headers.push_back(*h);
 136
 137    std::string date("Date: ");
 138    date.append(TimeRFC1123(time(NULL), false));
 139    headers.push_back(date);
 140
 141    if (chunkedTransferEncoding(headers) == true)
 142       headers.push_back("Transfer-Encoding: chunked");
 143
 144    log << ">>> RESPONSE to " << client << " >>>" << std::endl;
 145    bool Success = true;
 146    for (std::list<std::string>::const_iterator h = headers.begin();
 147         Success == true && h != headers.end(); ++h)
 148    {
 149       Success &= FileFd::Write(client, h->c_str(), h->size());
 150       if (Success == true)
 151          Success &= FileFd::Write(client, "\r\n", 2);
 152       log << *h << std::endl;
 153    }
 154    if (Success == true)
 155       Success &= FileFd::Write(client, "\r\n", 2);
 156    log << "<<<<<<<<<<<<<<<<" << std::endl;
 157    return Success;
 158 }
 159                                                                         /*}}}*/
 160 static bool sendFile(int const client, std::list<std::string> const &headers, FileFd &data)/*{{{*/
 161 {
 162    bool Success = true;
 163    bool const chunked = chunkedTransferEncoding(headers);
 164    char buffer[500];
 165    unsigned long long actual = 0;
 166    while ((Success &= data.Read(buffer, sizeof(buffer), &actual)) == true)
 167    {
 168       if (actual == 0)
 169          break;
 170
 171       if (chunked == true)
 172       {
 173          std::string size;
 174          strprintf(size, "%llX\r\n", actual);
 175          Success &= FileFd::Write(client, size.c_str(), size.size());
 176          Success &= FileFd::Write(client, buffer, actual);
 177          Success &= FileFd::Write(client, "\r\n", strlen("\r\n"));
 178       }
 179       else
 180          Success &= FileFd::Write(client, buffer, actual);
 181    }
 182    if (chunked == true)
 183    {
 184       char const * const finish = "0\r\n\r\n";
 185       Success &= FileFd::Write(client, finish, strlen(finish));
 186    }
 187    if (Success == false)
 188       std::cerr << "SENDFILE:" << (chunked ? " CHUNKED" : "") << " READ/WRITE ERROR to " << client << std::endl;
 189    return Success;
 190 }
 191                                                                         /*}}}*/
 192 static bool sendData(int const client, std::list<std::string> const &headers, std::string const &data)/*{{{*/
 193 {
 194    if (chunkedTransferEncoding(headers) == true)
 195    {
 196       unsigned long long const ullsize = data.length();
 197       std::string size;
 198       strprintf(size, "%llX\r\n", ullsize);
 199       char const * const finish = "\r\n0\r\n\r\n";
 200       if (FileFd::Write(client, size.c_str(), size.length()) == false ||
 201             FileFd::Write(client, data.c_str(), ullsize) == false ||
 202             FileFd::Write(client, finish, strlen(finish)) == false)
 203       {
 204          std::cerr << "SENDDATA: CHUNK WRITE ERROR to " << client << std::endl;
 205          return false;
 206       }
 207    }
 208    else if (FileFd::Write(client, data.c_str(), data.size()) == false)
 209    {
 210       std::cerr << "SENDDATA: WRITE ERROR to " << client << std::endl;
 211       return false;
 212    }
 213    return true;
 214 }
 215                                                                         /*}}}*/
 216 static void sendError(std::ostream &log, int const client, int const httpcode, std::string const &request,/*{{{*/
 217                bool const content, std::string const &error, std::list<std::string> &headers)
 218 {
 219    std::string response("<!doctype html><html><head><title>");
 220    response.append(httpcodeToStr(httpcode)).append("</title><meta charset=\"utf-8\" /></head>");
 221    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1>");
 222    if (httpcode != 200)
 223       response.append("<p><em>Error</em>: ");
 224    else
 225       response.append("<p><em>Success</em>: ");
 226    if (error.empty() == false)
 227       response.append(error);
 228    else
 229       response.append(httpcodeToStr(httpcode));
 230    if (httpcode != 200)
 231       response.append("</p>This error is a result of the request: <pre>");
 232    else
 233       response.append("The successfully executed operation was requested by: <pre>");
 234    response.append(request).append("</pre></body></html>");
 235    if (httpcode != 200)
 236    {
 237       if (_config->FindB("aptwebserver::closeOnError", false) == true)
 238          headers.push_back("Connection: close");
 239    }
 240    addDataHeaders(headers, response);
 241    sendHead(log, client, httpcode, headers);
 242    if (content == true)
 243       sendData(client, headers, response);
 244 }
 245 static void sendSuccess(std::ostream &log, int const client, std::string const &request,
 246                bool const content, std::string const &error, std::list<std::string> &headers)
 247 {
 248    sendError(log, client, 200, request, content, error, headers);
 249 }
 250                                                                         /*}}}*/
 251 static void sendRedirect(std::ostream &log, int const client, int const httpcode,/*{{{*/
 252                   std::string const &uri, std::string const &request, bool content)
 253 {
 254    std::list<std::string> headers;
 255    std::string response("<!doctype html><html><head><title>");
 256    response.append(httpcodeToStr(httpcode)).append("</title><meta charset=\"utf-8\" /></head>");
 257    response.append("<body><h1>").append(httpcodeToStr(httpcode)).append("</h1");
 258    response.append("<p>You should be redirected to <em>").append(uri).append("</em></p>");
 259    response.append("This page is a result of the request: <pre>");
 260    response.append(request).append("</pre></body></html>");
 261    addDataHeaders(headers, response);
 262    std::string location("Location: ");
 263    if (strncmp(uri.c_str(), "http://", 7) != 0 && strncmp(uri.c_str(), "https://", 8) != 0)
 264    {
 265       std::string const host = LookupTag(request, "Host");
 266       unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 267       std::string hosthttpsport;
 268       strprintf(hosthttpsport, ":%u", httpsport);
 269       if (host.find(hosthttpsport) != std::string::npos)
 270          location.append("https://");
 271       else
 272          location.append("http://");
 273       location.append(host).append("/");
 274       if (strncmp("/home/", uri.c_str(), strlen("/home/")) == 0 && uri.find("/public_html/") != std::string::npos)
 275       {
 276          std::string homeuri = SubstVar(uri, "/home/", "~");
 277          homeuri = SubstVar(homeuri, "/public_html/", "/");
 278          location.append(homeuri);
 279       }
 280       else
 281          location.append(uri);
 282    }
 283    else
 284       location.append(uri);
 285    headers.push_back(location);
 286    sendHead(log, client, httpcode, headers);
 287    if (content == true)
 288       sendData(client, headers, response);
 289 }
 290                                                                         /*}}}*/
 291 static int filter_hidden_files(const struct dirent *a)                  /*{{{*/
 292 {
 293    if (a->d_name[0] == '.')
 294       return 0;
 295 #ifdef _DIRENT_HAVE_D_TYPE
 296    // if we have the d_type check that only files and dirs will be included
 297    if (a->d_type != DT_UNKNOWN &&
 298        a->d_type != DT_REG &&
 299        a->d_type != DT_LNK && // this includes links to regular files
 300        a->d_type != DT_DIR)
 301       return 0;
 302 #endif
 303    return 1;
 304 }
 305 static int grouped_alpha_case_sort(const struct dirent **a, const struct dirent **b) {
 306 #ifdef _DIRENT_HAVE_D_TYPE
 307    if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_DIR);
 308    else if ((*a)->d_type == DT_DIR && (*b)->d_type == DT_REG)
 309       return -1;
 310    else if ((*b)->d_type == DT_DIR && (*a)->d_type == DT_REG)
 311       return 1;
 312    else
 313 #endif
 314    {
 315       struct stat f_prop; //File's property
 316       stat((*a)->d_name, &f_prop);
 317       int const amode = f_prop.st_mode;
 318       stat((*b)->d_name, &f_prop);
 319       int const bmode = f_prop.st_mode;
 320       if (S_ISDIR(amode) && S_ISDIR(bmode));
 321       else if (S_ISDIR(amode))
 322          return -1;
 323       else if (S_ISDIR(bmode))
 324          return 1;
 325    }
 326    return strcasecmp((*a)->d_name, (*b)->d_name);
 327 }
 328                                                                         /*}}}*/
 329 static void sendDirectoryListing(std::ostream &log, int const client, std::string const &dir,/*{{{*/
 330                           std::string const &request, bool content, std::list<std::string> &headers)
 331 {
 332    struct dirent **namelist;
 333    int const counter = scandir(dir.c_str(), &namelist, filter_hidden_files, grouped_alpha_case_sort);
 334    if (counter == -1)
 335    {
 336       sendError(log, client, 500, request, content, "scandir failed", headers);
 337       return;
 338    }
 339
 340    std::ostringstream listing;
 341    listing << "<!doctype html><html><head><title>Index of " << dir << "</title><meta charset=\"utf-8\" />"
 342            << "<style type=\"text/css\"><!-- td {padding: 0.02em 0.5em 0.02em 0.5em;}"
 343            << "tr:nth-child(even){background-color:#dfdfdf;}"
 344            << "h1, td:nth-child(3){text-align:center;}"
 345            << "table {margin-left:auto;margin-right:auto;} --></style>"
 346            << "</head>" << std::endl
 347            << "<body><h1>Index of " << dir << "</h1>" << std::endl
 348            << "<table><tr><th>#</th><th>Name</th><th>Size</th><th>Last-Modified</th></tr>" << std::endl;
 349    if (dir != "./")
 350       listing << "<tr><td>d</td><td><a href=\"..\">Parent Directory</a></td><td>-</td><td>-</td></tr>";
 351    for (int i = 0; i < counter; ++i) {
 352       struct stat fs;
 353       std::string filename(dir);
 354       filename.append("/").append(namelist[i]->d_name);
 355       stat(filename.c_str(), &fs);
 356       if (S_ISDIR(fs.st_mode))
 357       {
 358          listing << "<tr><td>d</td>"
 359                  << "<td><a href=\"" << namelist[i]->d_name << "/\">" << namelist[i]->d_name << "</a></td>"
 360                  << "<td>-</td>";
 361       }
 362       else
 363       {
 364          listing << "<tr><td>f</td>"
 365                  << "<td><a href=\"" << namelist[i]->d_name << "\">" << namelist[i]->d_name << "</a></td>"
 366                  << "<td>" << SizeToStr(fs.st_size) << "B</td>";
 367       }
 368       listing << "<td>" << TimeRFC1123(fs.st_mtime, true) << "</td></tr>" << std::endl;
 369    }
 370    listing << "</table></body></html>" << std::endl;
 371
 372    std::string response(listing.str());
 373    addDataHeaders(headers, response);
 374    sendHead(log, client, 200, headers);
 375    if (content == true)
 376       sendData(client, headers, response);
 377 }
 378                                                                         /*}}}*/
 379 static bool parseFirstLine(std::ostream &log, int const client, std::string const &request,/*{{{*/
 380                     std::string &filename, std::string &params, bool &sendContent,
 381                     bool &closeConnection, std::list<std::string> &headers)
 382 {
 383    if (strncmp(request.c_str(), "HEAD ", 5) == 0)
 384       sendContent = false;
 385    if (strncmp(request.c_str(), "GET ", 4) != 0)
 386    {
 387       sendError(log, client, 501, request, true, "", headers);
 388       return false;
 389    }
 390
 391    size_t const lineend = request.find('\n');
 392    size_t filestart = request.find(' ');
 393    for (; request[filestart] == ' '; ++filestart);
 394    size_t fileend = request.rfind(' ', lineend);
 395    if (lineend == std::string::npos || filestart == std::string::npos ||
 396          fileend == std::string::npos || filestart == fileend)
 397    {
 398       sendError(log, client, 500, request, sendContent, "Filename can't be extracted", headers);
 399       return false;
 400    }
 401
 402    size_t httpstart = fileend;
 403    for (; request[httpstart] == ' '; ++httpstart);
 404    if (strncmp(request.c_str() + httpstart, "HTTP/1.1\r", 9) == 0)
 405       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "Keep-Alive") != 0;
 406    else if (strncmp(request.c_str() + httpstart, "HTTP/1.0\r", 9) == 0)
 407       closeConnection = strcasecmp(LookupTag(request, "Connection", "Keep-Alive").c_str(), "close") == 0;
 408    else
 409    {
 410       sendError(log, client, 500, request, sendContent, "Not a HTTP/1.{0,1} request", headers);
 411       return false;
 412    }
 413
 414    filename = request.substr(filestart, fileend - filestart);
 415    if (filename.find(' ') != std::string::npos)
 416    {
 417       sendError(log, client, 500, request, sendContent, "Filename contains an unencoded space", headers);
 418       return false;
 419    }
 420
 421    std::string host = LookupTag(request, "Host", "");
 422    if (host.empty() == true)
 423    {
 424       // RFC 2616 §14.23 requires Host
 425       sendError(log, client, 400, request, sendContent, "Host header is required", headers);
 426       return false;
 427    }
 428    host = "http://" + host;
 429
 430    // Proxies require absolute uris, so this is a simple proxy-fake option
 431    std::string const absolute = _config->Find("aptwebserver::request::absolute", "uri,path");
 432    if (strncmp(host.c_str(), filename.c_str(), host.length()) == 0 && APT::String::Startswith(filename, "/_config/") == false)
 433    {
 434       if (absolute.find("uri") == std::string::npos)
 435       {
 436          sendError(log, client, 400, request, sendContent, "Request is absoluteURI, but configured to not accept that", headers);
 437          return false;
 438       }
 439
 440       // strip the host from the request to make it an absolute path
 441       filename.erase(0, host.length());
 442
 443       std::string const authConf = _config->Find("aptwebserver::proxy-authorization", "");
 444       std::string auth = LookupTag(request, "Proxy-Authorization", "");
 445       if (authConf.empty() != auth.empty())
 446       {
 447          if (auth.empty())
 448             sendError(log, client, 407, request, sendContent, "Proxy requires authentication", headers);
 449          else
 450             sendError(log, client, 407, request, sendContent, "Client wants to authenticate to proxy, but proxy doesn't need it", headers);
 451         return false;
 452       }
 453       if (authConf.empty() == false)
 454       {
 455          char const * const basic = "Basic ";
 456          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 457          {
 458             auth.erase(0, strlen(basic));
 459             if (auth != authConf)
 460             {
 461                sendError(log, client, 407, request, sendContent, "Proxy-Authentication doesn't match", headers);
 462                return false;
 463             }
 464          }
 465          else
 466          {
 467             std::list<std::string> headers;
 468             headers.push_back("Proxy-Authenticate: Basic");
 469             sendError(log, client, 407, request, sendContent, "Unsupported Proxy-Authentication Scheme", headers);
 470             return false;
 471          }
 472       }
 473    }
 474    else if (absolute.find("path") == std::string::npos && APT::String::Startswith(filename, "/_config/") == false)
 475    {
 476       sendError(log, client, 400, request, sendContent, "Request is absolutePath, but configured to not accept that", headers);
 477       return false;
 478    }
 479
 480    if (APT::String::Startswith(filename, "/_config/") == false)
 481    {
 482       std::string const authConf = _config->Find("aptwebserver::authorization", "");
 483       std::string auth = LookupTag(request, "Authorization", "");
 484       if (authConf.empty() != auth.empty())
 485       {
 486          if (auth.empty())
 487             sendError(log, client, 401, request, sendContent, "Server requires authentication", headers);
 488          else
 489             sendError(log, client, 401, request, sendContent, "Client wants to authenticate to server, but server doesn't need it", headers);
 490          return false;
 491       }
 492       if (authConf.empty() == false)
 493       {
 494          char const * const basic = "Basic ";
 495          if (strncmp(auth.c_str(), basic, strlen(basic)) == 0)
 496          {
 497             auth.erase(0, strlen(basic));
 498             if (auth != authConf)
 499             {
 500                sendError(log, client, 401, request, sendContent, "Authentication doesn't match", headers);
 501                return false;
 502             }
 503          }
 504          else
 505          {
 506             headers.push_back("WWW-Authenticate: Basic");
 507             sendError(log, client, 401, request, sendContent, "Unsupported Authentication Scheme", headers);
 508             return false;
 509          }
 510       }
 511    }
 512
 513    size_t paramspos = filename.find('?');
 514    if (paramspos != std::string::npos)
 515    {
 516       params = filename.substr(paramspos + 1);
 517       filename.erase(paramspos);
 518    }
 519
 520    filename = DeQuoteString(filename);
 521
 522    // this is not a secure server, but at least prevent the obvious …
 523    if (filename.empty() == true || filename[0] != '/' ||
 524        strncmp(filename.c_str(), "//", 2) == 0 ||
 525        filename.find_first_of("\r\n\t\f\v") != std::string::npos ||
 526        filename.find("/../") != std::string::npos)
 527    {
 528       std::list<std::string> headers;
 529       sendError(log, client, 400, request, sendContent, "Filename contains illegal character (sequence)", headers);
 530       return false;
 531    }
 532
 533    // nuke the first character which is a / as we assured above
 534    filename.erase(0, 1);
 535    if (filename.empty() == true)
 536       filename = "./";
 537    // support ~user/ uris to refer to /home/user/public_html/ as a kind-of special directory
 538    else if (filename[0] == '~')
 539    {
 540       // /home/user is actually not entirely correct, but good enough for now
 541       size_t dashpos = filename.find('/');
 542       if (dashpos != std::string::npos)
 543       {
 544          std::string home = filename.substr(1, filename.find('/') - 1);
 545          std::string pubhtml = filename.substr(filename.find('/') + 1);
 546          filename = "/home/" + home + "/public_html/" + pubhtml;
 547       }
 548       else
 549          filename = "/home/" + filename.substr(1) + "/public_html/";
 550    }
 551
 552    // if no filename is given, but a valid directory see if we can use an index or
 553    // have to resort to a autogenerated directory listing later on
 554    if (DirectoryExists(filename) == true)
 555    {
 556       std::string const directoryIndex = _config->Find("aptwebserver::directoryindex");
 557       if (directoryIndex.empty() == false && directoryIndex == flNotDir(directoryIndex) &&
 558             RealFileExists(filename + directoryIndex) == true)
 559          filename += directoryIndex;
 560    }
 561
 562    return true;
 563 }
 564                                                                         /*}}}*/
 565 static bool handleOnTheFlyReconfiguration(std::ostream &log, int const client,/*{{{*/
 566       std::string const &request, std::vector<std::string> parts, std::list<std::string> &headers)
 567 {
 568    size_t const pcount = parts.size();
 569    for (size_t i = 0; i < pcount; ++i)
 570       parts[i] = DeQuoteString(parts[i]);
 571    if (pcount == 4 && parts[1] == "set")
 572    {
 573       _config->Set(parts[2], parts[3]);
 574       sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was set to '" + parts[3] + "'!", headers);
 575       return true;
 576    }
 577    else if (pcount == 4 && parts[1] == "find")
 578    {
 579       std::string response = _config->Find(parts[2], parts[3]);
 580       addDataHeaders(headers, response);
 581       sendHead(log, client, 200, headers);
 582       sendData(client, headers, response);
 583       return true;
 584    }
 585    else if (pcount == 3 && parts[1] == "find")
 586    {
 587       if (_config->Exists(parts[2]) == true)
 588       {
 589          std::string response = _config->Find(parts[2]);
 590          addDataHeaders(headers, response);
 591          sendHead(log, client, 200, headers);
 592          sendData(client, headers, response);
 593          return true;
 594       }
 595       sendError(log, client, 404, request, true, "Requested Configuration option doesn't exist", headers);
 596       return false;
 597    }
 598    else if (pcount == 3 && parts[1] == "clear")
 599    {
 600       _config->Clear(parts[2]);
 601       sendSuccess(log, client, request, true, "Option '" + parts[2] + "' was cleared.", headers);
 602       return true;
 603    }
 604
 605    sendError(log, client, 400, request, true, "Unknown on-the-fly configuration request", headers);
 606    return false;
 607 }
 608                                                                         /*}}}*/
 609 static void * handleClient(int const client, size_t const id)           /*{{{*/
 610 {
 611    auto logfilepath = _config->FindFile("aptwebserver::logfiles");
 612    if (logfilepath.empty() == false)
 613       strprintf(logfilepath, "%s.client-%lu.log", logfilepath.c_str(), id);
 614    else
 615       logfilepath = "/dev/null";
 616    std::ofstream logfile(logfilepath);
 617    basic_teeostream<char> log(std::clog, logfile);
 618
 619    log << "ACCEPT client " << client << std::endl;
 620    bool closeConnection = false;
 621    while (closeConnection == false)
 622    {
 623       std::vector<std::string> messages;
 624       if (ReadMessages(client, messages) == false)
 625          break;
 626
 627       std::list<std::string> headers;
 628       for (std::vector<std::string>::const_iterator m = messages.begin();
 629             m != messages.end() && closeConnection == false; ++m) {
 630          // if we announced a closing in previous response, do the close now
 631          if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 632          {
 633             closeConnection = true;
 634             break;
 635          }
 636          headers.clear();
 637
 638          log << ">>> REQUEST from " << client << " >>>" << std::endl << *m
 639             << std::endl << "<<<<<<<<<<<<<<<<" << std::endl;
 640          std::string filename;
 641          std::string params;
 642          bool sendContent = true;
 643          if (parseFirstLine(log, client, *m, filename, params, sendContent, closeConnection, headers) == false)
 644             continue;
 645
 646          // special webserver command request
 647          if (filename.length() > 1 && filename[0] == '_')
 648          {
 649             std::vector<std::string> parts = VectorizeString(filename, '/');
 650             if (parts[0] == "_config")
 651             {
 652                handleOnTheFlyReconfiguration(log, client, *m, parts, headers);
 653                continue;
 654             }
 655          }
 656
 657          // string replacements in the requested filename
 658          ::Configuration::Item const *Replaces = _config->Tree("aptwebserver::redirect::replace");
 659          if (Replaces != NULL)
 660          {
 661             std::string redirect = "/" + filename;
 662             for (::Configuration::Item *I = Replaces->Child; I != NULL; I = I->Next)
 663                redirect = SubstVar(redirect, I->Tag, I->Value);
 664             if (redirect.empty() == false && redirect[0] == '/')
 665                redirect.erase(0,1);
 666             if (redirect != filename)
 667             {
 668                sendRedirect(log, client, _config->FindI("aptwebserver::redirect::httpcode", 301), redirect, *m, sendContent);
 669                continue;
 670             }
 671          }
 672
 673          ::Configuration::Item const *Overwrite = _config->Tree("aptwebserver::overwrite");
 674          if (Overwrite != NULL)
 675          {
 676             for (::Configuration::Item *I = Overwrite->Child; I != NULL; I = I->Next)
 677             {
 678                regex_t *pattern = new regex_t;
 679                int const res = regcomp(pattern, I->Tag.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
 680                if (res != 0)
 681                {
 682                   char error[300];
 683                   regerror(res, pattern, error, sizeof(error));
 684                   sendError(log, client, 500, *m, sendContent, error, headers);
 685                   continue;
 686                }
 687                if (regexec(pattern, filename.c_str(), 0, 0, 0) == 0)
 688                {
 689                   filename = _config->Find("aptwebserver::overwrite::" + I->Tag + "::filename", filename);
 690                   if (filename[0] == '/')
 691                      filename.erase(0,1);
 692                   regfree(pattern);
 693                   break;
 694                }
 695                regfree(pattern);
 696             }
 697          }
 698
 699          // deal with the request
 700          unsigned int const httpsport = _config->FindI("aptwebserver::port::https", 4433);
 701          std::string hosthttpsport;
 702          strprintf(hosthttpsport, ":%u", httpsport);
 703          if (_config->FindB("aptwebserver::support::http", true) == false &&
 704                LookupTag(*m, "Host").find(hosthttpsport) == std::string::npos)
 705          {
 706             sendError(log, client, 400, *m, sendContent, "HTTP disabled, all requests must be HTTPS", headers);
 707             continue;
 708          }
 709          else if (RealFileExists(filename) == true)
 710          {
 711             FileFd data(filename, FileFd::ReadOnly);
 712             std::string condition = LookupTag(*m, "If-Modified-Since", "");
 713             if (_config->FindB("aptwebserver::support::modified-since", true) == true && condition.empty() == false)
 714             {
 715                time_t cache;
 716                if (RFC1123StrToTime(condition.c_str(), cache) == true &&
 717                      cache >= data.ModificationTime())
 718                {
 719                   sendHead(log, client, 304, headers);
 720                   continue;
 721                }
 722             }
 723
 724             if (_config->FindB("aptwebserver::support::range", true) == true)
 725                condition = LookupTag(*m, "Range", "");
 726             else
 727                condition.clear();
 728             if (condition.empty() == false && strncmp(condition.c_str(), "bytes=", 6) == 0)
 729             {
 730                std::string ranges = ',' + _config->Find("aptwebserver::response-header::Accept-Ranges") + ',';
 731                ranges.erase(std::remove(ranges.begin(), ranges.end(), ' '), ranges.end());
 732                if (ranges.find(",bytes,") == std::string::npos)
 733                {
 734                   // we handle it as an error here because we are a test server - a real one should just ignore it
 735                   sendError(log, client, 400, *m, sendContent, "Client does range requests we don't support", headers);
 736                   continue;
 737                }
 738
 739                time_t cache;
 740                std::string ifrange;
 741                if (_config->FindB("aptwebserver::support::if-range", true) == true)
 742                   ifrange = LookupTag(*m, "If-Range", "");
 743                bool validrange = (ifrange.empty() == true ||
 744                      (RFC1123StrToTime(ifrange.c_str(), cache) == true &&
 745                       cache <= data.ModificationTime()));
 746
 747                // FIXME: support multiple byte-ranges (APT clients do not do this)
 748                if (condition.find(',') == std::string::npos)
 749                {
 750                   size_t start = 6;
 751                   unsigned long long filestart = strtoull(condition.c_str() + start, NULL, 10);
 752                   // FIXME: no support for last-byte-pos being not the end of the file (APT clients do not do this)
 753                   size_t dash = condition.find('-') + 1;
 754                   unsigned long long fileend = strtoull(condition.c_str() + dash, NULL, 10);
 755                   unsigned long long filesize = data.FileSize();
 756                   if ((fileend == 0 || (fileend == filesize && fileend >= filestart)) &&
 757                         validrange == true)
 758                   {
 759                      if (filesize > filestart)
 760                      {
 761                         data.Skip(filestart);
 762                         // make sure to send content-range before conent-length
 763                         // as regression test for LP: #1445239
 764                         std::ostringstream contentrange;
 765                         contentrange << "Content-Range: bytes " << filestart << "-"
 766                            << filesize - 1 << "/" << filesize;
 767                         headers.push_back(contentrange.str());
 768                         std::ostringstream contentlength;
 769                         contentlength << "Content-Length: " << (filesize - filestart);
 770                         headers.push_back(contentlength.str());
 771                         sendHead(log, client, 206, headers);
 772                         if (sendContent == true)
 773                            sendFile(client, headers, data);
 774                         continue;
 775                      }
 776                      else
 777                      {
 778                         if (_config->FindB("aptwebserver::support::content-range", true) == true)
 779                         {
 780                            std::ostringstream contentrange;
 781                            contentrange << "Content-Range: bytes */" << filesize;
 782                            headers.push_back(contentrange.str());
 783                         }
 784                         sendError(log, client, 416, *m, sendContent, "", headers);
 785                         continue;
 786                      }
 787                   }
 788                }
 789             }
 790
 791             addFileHeaders(headers, data);
 792             sendHead(log, client, 200, headers);
 793             if (sendContent == true)
 794                sendFile(client, headers, data);
 795          }
 796          else if (DirectoryExists(filename) == true)
 797          {
 798             if (filename[filename.length()-1] == '/')
 799                sendDirectoryListing(log, client, filename, *m, sendContent, headers);
 800             else
 801                sendRedirect(log, client, 301, filename.append("/"), *m, sendContent);
 802          }
 803          else
 804             sendError(log, client, 404, *m, sendContent, "", headers);
 805       }
 806
 807       // if we announced a closing in the last response, do the close now
 808       if (std::find(headers.begin(), headers.end(), std::string("Connection: close")) != headers.end())
 809          closeConnection = true;
 810
 811       if (_error->PendingError() == true)
 812          break;
 813       _error->DumpErrors(std::cerr);
 814    }
 815    _error->DumpErrors(std::cerr);
 816    close(client);
 817    log << "CLOSE client " << client << std::endl;
 818    return NULL;
 819 }
 820                                                                         /*}}}*/
 821
 822 int main(int const argc, const char * argv[])
 823 {
 824    CommandLine::Args Args[] = {
 825       {'p', "port", "aptwebserver::port", CommandLine::HasArg},
 826       {0, "request-absolute", "aptwebserver::request::absolute", CommandLine::HasArg},
 827       {0, "authorization", "aptwebserver::authorization", CommandLine::HasArg},
 828       {0, "proxy-authorization", "aptwebserver::proxy-authorization", CommandLine::HasArg},
 829       {0, "logfiles", "aptwebserver::logfiles", CommandLine::HasArg},
 830       {'c',"config-file",0,CommandLine::ConfigFile},
 831       {'o',"option",0,CommandLine::ArbItem},
 832       {0,0,0,0}
 833    };
 834
 835    CommandLine CmdL(Args, _config);
 836    if(CmdL.Parse(argc,argv) == false)
 837    {
 838       _error->DumpErrors();
 839       exit(1);
 840    }
 841
 842    // create socket, bind and listen to it {{{
 843    // ignore SIGPIPE, this can happen on write() if the socket closes connection
 844    signal(SIGPIPE, SIG_IGN);
 845    // we don't care for our slaves, so ignore their death
 846    signal(SIGCHLD, SIG_IGN);
 847
 848    int sock = socket(AF_INET6, SOCK_STREAM, 0);
 849    if(sock < 0)
 850    {
 851       _error->Errno("aptwerbserver", "Couldn't create socket");
 852       _error->DumpErrors(std::cerr);
 853       return 1;
 854    }
 855
 856    int port = _config->FindI("aptwebserver::port", 8080);
 857
 858    // ensure that we accept all connections: v4 or v6
 859    int const iponly = 0;
 860    setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &iponly, sizeof(iponly));
 861    // to not linger on an address
 862    int const enable = 1;
 863    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable));
 864
 865    struct sockaddr_in6 locAddr;
 866    memset(&locAddr, 0, sizeof(locAddr));
 867    locAddr.sin6_family = AF_INET6;
 868    locAddr.sin6_port = htons(port);
 869    locAddr.sin6_addr = in6addr_any;
 870
 871    if (bind(sock, (struct sockaddr*) &locAddr, sizeof(locAddr)) < 0)
 872    {
 873       _error->Errno("aptwerbserver", "Couldn't bind");
 874       _error->DumpErrors(std::cerr);
 875       return 2;
 876    }
 877
 878    if (port == 0)
 879    {
 880       struct sockaddr_in6 addr;
 881       socklen_t addrlen = sizeof(sockaddr_in6);
 882       if (getsockname(sock, (struct sockaddr*) &addr, &addrlen) != 0)
 883          _error->Errno("getsockname", "Could not get chosen port number");
 884       else
 885          port = ntohs(addr.sin6_port);
 886    }
 887    std::string const portfilename = _config->Find("aptwebserver::portfile", "");
 888    if (portfilename.empty() == false)
 889    {
 890       FileFd portfile(portfilename, FileFd::WriteOnly | FileFd::Create | FileFd::Empty);
 891       std::string portcontent;
 892       strprintf(portcontent, "%d", port);
 893       portfile.Write(portcontent.c_str(), portcontent.size());
 894       portfile.Sync();
 895    }
 896    _config->Set("aptwebserver::port::http", port);
 897
 898    FileFd pidfile;
 899    if (_config->FindB("aptwebserver::fork", false) == true)
 900    {
 901       std::string const pidfilename = _config->Find("aptwebserver::pidfile", "aptwebserver.pid");
 902       int const pidfilefd = GetLock(pidfilename);
 903       if (pidfilefd < 0 || pidfile.OpenDescriptor(pidfilefd, FileFd::WriteOnly) == false)
 904       {
 905          _error->Errno("aptwebserver", "Couldn't acquire lock on pidfile '%s'", pidfilename.c_str());
 906          _error->DumpErrors(std::cerr);
 907          return 3;
 908       }
 909
 910       pid_t child = fork();
 911       if (child < 0)
 912       {
 913          _error->Errno("aptwebserver", "Forking failed");
 914          _error->DumpErrors(std::cerr);
 915          return 4;
 916       }
 917       else if (child != 0)
 918       {
 919          // successfully forked: ready to serve!
 920          std::string pidcontent;
 921          strprintf(pidcontent, "%d", child);
 922          pidfile.Write(pidcontent.c_str(), pidcontent.size());
 923          pidfile.Sync();
 924          if (_error->PendingError() == true)
 925          {
 926             _error->DumpErrors(std::cerr);
 927             return 5;
 928          }
 929          std::cout << "Successfully forked as " << child << std::endl;
 930          return 0;
 931       }
 932    }
 933
 934    std::clog << "Serving ANY file on port: " << port << std::endl;
 935
 936    int const slaves = _config->FindI("aptwebserver::slaves", SOMAXCONN);
 937    std::cerr << "SLAVES: " << slaves << std::endl;
 938    listen(sock, slaves);
 939    /*}}}*/
 940
 941    _config->CndSet("aptwebserver::response-header::Server", "APT webserver");
 942    _config->CndSet("aptwebserver::response-header::Accept-Ranges", "bytes");
 943    _config->CndSet("aptwebserver::directoryindex", "index.html");
 944
 945    size_t id = 0;
 946    while (true)
 947    {
 948       int client = accept(sock, NULL, NULL);
 949       if (client == -1)
 950       {
 951          if (errno == EINTR)
 952             continue;
 953          _error->Errno("accept", "Couldn't accept client on socket %d", sock);
 954          _error->DumpErrors(std::cerr);
 955          return 6;
 956       }
 957
 958       std::thread t(handleClient, client, ++id);
 959       t.detach();
 960    }
 961    pidfile.Close();
 962
 963    return 0;
 964 }