methods/server.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    HTTP and HTTPS share a lot of common code and these classes are
   6    exactly the dumping ground for this common code
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <config.h>
  12
  13 #include <apt-pkg/configuration.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/fileutl.h>
  16 #include <apt-pkg/strutl.h>
  17
  18 #include <ctype.h>
  19 #include <signal.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/stat.h>
  23 #include <sys/time.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <iostream>
  27 #include <limits>
  28 #include <map>
  29 #include <string>
  30 #include <vector>
  31
  32 #include "server.h"
  33
  34 #include <apti18n.h>
  35                                                                         /*}}}*/
  36 using namespace std;
  37
  38 string ServerMethod::FailFile;
  39 int ServerMethod::FailFd = -1;
  40 time_t ServerMethod::FailTime = 0;
  41
  42 // ServerState::RunHeaders - Get the headers before the data            /*{{{*/
  43 // ---------------------------------------------------------------------
  44 /* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
  45    parse error occurred */
  46 ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File,
  47                                                       const std::string &Uri)
  48 {
  49    State = Header;
  50
  51    Owner->Status(_("Waiting for headers"));
  52
  53    Major = 0;
  54    Minor = 0;
  55    Result = 0;
  56    TotalFileSize = 0;
  57    JunkSize = 0;
  58    StartPos = 0;
  59    Encoding = Closes;
  60    HaveContent = false;
  61    time(&Date);
  62
  63    do
  64    {
  65       string Data;
  66       if (ReadHeaderLines(Data) == false)
  67          continue;
  68
  69       if (Owner->Debug == true)
  70          clog << "Answer for: " << Uri << endl << Data;
  71
  72       for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
  73       {
  74          string::const_iterator J = I;
  75          for (; J != Data.end() && *J != '\n' && *J != '\r'; ++J);
  76          if (HeaderLine(string(I,J)) == false)
  77             return RUN_HEADERS_PARSE_ERROR;
  78          I = J;
  79       }
  80
  81       // 100 Continue is a Nop...
  82       if (Result == 100)
  83          continue;
  84
  85       // Tidy up the connection persistence state.
  86       if (Encoding == Closes && HaveContent == true)
  87          Persistent = false;
  88
  89       return RUN_HEADERS_OK;
  90    }
  91    while (LoadNextResponse(false, File) == true);
  92
  93    return RUN_HEADERS_IO_ERROR;
  94 }
  95                                                                         /*}}}*/
  96 // ServerState::HeaderLine - Process a header line                      /*{{{*/
  97 // ---------------------------------------------------------------------
  98 /* */
  99 bool ServerState::HeaderLine(string Line)
 100 {
 101    if (Line.empty() == true)
 102       return true;
 103
 104    string::size_type Pos = Line.find(' ');
 105    if (Pos == string::npos || Pos+1 > Line.length())
 106    {
 107       // Blah, some servers use "connection:closes", evil.
 108       Pos = Line.find(':');
 109       if (Pos == string::npos || Pos + 2 > Line.length())
 110          return _error->Error(_("Bad header line"));
 111       Pos++;
 112    }
 113
 114    // Parse off any trailing spaces between the : and the next word.
 115    string::size_type Pos2 = Pos;
 116    while (Pos2 < Line.length() && isspace_ascii(Line[Pos2]) != 0)
 117       Pos2++;
 118
 119    string Tag = string(Line,0,Pos);
 120    string Val = string(Line,Pos2);
 121
 122    if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
 123    {
 124       // Evil servers return no version
 125       if (Line[4] == '/')
 126       {
 127          int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
 128          if (elements == 3)
 129          {
 130             Code[0] = '\0';
 131             if (Owner != NULL && Owner->Debug == true)
 132                clog << "HTTP server doesn't give Reason-Phrase for " << std::to_string(Result) << std::endl;
 133          }
 134          else if (elements != 4)
 135             return _error->Error(_("The HTTP server sent an invalid reply header"));
 136       }
 137       else
 138       {
 139          Major = 0;
 140          Minor = 9;
 141          if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
 142             return _error->Error(_("The HTTP server sent an invalid reply header"));
 143       }
 144
 145       /* Check the HTTP response header to get the default persistence
 146          state. */
 147       if (Major < 1)
 148          Persistent = false;
 149       else
 150       {
 151          if (Major == 1 && Minor == 0)
 152          {
 153             Persistent = false;
 154          }
 155          else
 156          {
 157             Persistent = true;
 158             if (PipelineAllowed)
 159                Pipeline = true;
 160          }
 161       }
 162
 163       return true;
 164    }
 165
 166    if (stringcasecmp(Tag,"Content-Length:") == 0)
 167    {
 168       if (Encoding == Closes)
 169          Encoding = Stream;
 170       HaveContent = true;
 171
 172       unsigned long long * DownloadSizePtr = &DownloadSize;
 173       if (Result == 416 || (Result >= 300 && Result < 400))
 174          DownloadSizePtr = &JunkSize;
 175
 176       *DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
 177       if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
 178          return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
 179       else if (*DownloadSizePtr == 0)
 180          HaveContent = false;
 181
 182       // On partial content (206) the Content-Length less than the real
 183       // size, so do not set it here but leave that to the Content-Range
 184       // header instead
 185       if(Result != 206 && TotalFileSize == 0)
 186          TotalFileSize = DownloadSize;
 187
 188       return true;
 189    }
 190
 191    if (stringcasecmp(Tag,"Content-Type:") == 0)
 192    {
 193       HaveContent = true;
 194       return true;
 195    }
 196
 197    if (stringcasecmp(Tag,"Content-Range:") == 0)
 198    {
 199       HaveContent = true;
 200
 201       // §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
 202       if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&TotalFileSize) == 1)
 203          ; // we got the expected filesize which is all we wanted
 204       else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
 205          return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
 206       if ((unsigned long long)StartPos > TotalFileSize)
 207          return _error->Error(_("This HTTP server has broken range support"));
 208
 209       // figure out what we will download
 210       DownloadSize = TotalFileSize - StartPos;
 211       return true;
 212    }
 213
 214    if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
 215    {
 216       HaveContent = true;
 217       if (stringcasecmp(Val,"chunked") == 0)
 218          Encoding = Chunked;
 219       return true;
 220    }
 221
 222    if (stringcasecmp(Tag,"Connection:") == 0)
 223    {
 224       if (stringcasecmp(Val,"close") == 0)
 225          Persistent = false;
 226       if (stringcasecmp(Val,"keep-alive") == 0)
 227          Persistent = true;
 228       return true;
 229    }
 230
 231    if (stringcasecmp(Tag,"Last-Modified:") == 0)
 232    {
 233       if (RFC1123StrToTime(Val.c_str(), Date) == false)
 234          return _error->Error(_("Unknown date format"));
 235       return true;
 236    }
 237
 238    if (stringcasecmp(Tag,"Location:") == 0)
 239    {
 240       Location = Val;
 241       return true;
 242    }
 243
 244    return true;
 245 }
 246                                                                         /*}}}*/
 247 // ServerState::ServerState - Constructor                               /*{{{*/
 248 ServerState::ServerState(URI Srv, ServerMethod *Owner) :
 249    DownloadSize(0), ServerName(Srv), TimeOut(120), Owner(Owner)
 250 {
 251    Reset();
 252 }
 253                                                                         /*}}}*/
 254 bool ServerState::AddPartialFileToHashes(FileFd &File)                  /*{{{*/
 255 {
 256    File.Truncate(StartPos);
 257    return GetHashes()->AddFD(File, StartPos);
 258 }
 259                                                                         /*}}}*/
 260
 261 // ServerMethod::DealWithHeaders - Handle the retrieved header data     /*{{{*/
 262 // ---------------------------------------------------------------------
 263 /* We look at the header data we got back from the server and decide what
 264    to do. Returns DealWithHeadersResult (see http.h for details).
 265  */
 266 ServerMethod::DealWithHeadersResult
 267 ServerMethod::DealWithHeaders(FetchResult &Res)
 268 {
 269    // Not Modified
 270    if (Server->Result == 304)
 271    {
 272       RemoveFile("server", Queue->DestFile);
 273       Res.IMSHit = true;
 274       Res.LastModified = Queue->LastModified;
 275       Res.Size = 0;
 276       return IMS_HIT;
 277    }
 278
 279    /* Redirect
 280     *
 281     * Note that it is only OK for us to treat all redirection the same
 282     * because we *always* use GET, not other HTTP methods.  There are
 283     * three redirection codes for which it is not appropriate that we
 284     * redirect.  Pass on those codes so the error handling kicks in.
 285     */
 286    if (AllowRedirect
 287        && (Server->Result > 300 && Server->Result < 400)
 288        && (Server->Result != 300       // Multiple Choices
 289            && Server->Result != 304    // Not Modified
 290            && Server->Result != 306))  // (Not part of HTTP/1.1, reserved)
 291    {
 292       if (Server->Location.empty() == true)
 293          ;
 294       else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
 295       {
 296          URI Uri = Queue->Uri;
 297          if (Uri.Host.empty() == false)
 298             NextURI = URI::SiteOnly(Uri);
 299          else
 300             NextURI.clear();
 301          NextURI.append(DeQuoteString(Server->Location));
 302          if (Queue->Uri == NextURI)
 303          {
 304             SetFailReason("RedirectionLoop");
 305             _error->Error("Redirection loop encountered");
 306             if (Server->HaveContent == true)
 307                return ERROR_WITH_CONTENT_PAGE;
 308             return ERROR_UNRECOVERABLE;
 309          }
 310          return TRY_AGAIN_OR_REDIRECT;
 311       }
 312       else
 313       {
 314          NextURI = DeQuoteString(Server->Location);
 315          URI tmpURI = NextURI;
 316          if (tmpURI.Access == "http" && Binary == "https+http")
 317          {
 318             tmpURI.Access = "https+http";
 319             NextURI = tmpURI;
 320          }
 321          if (Queue->Uri == NextURI)
 322          {
 323             SetFailReason("RedirectionLoop");
 324             _error->Error("Redirection loop encountered");
 325             if (Server->HaveContent == true)
 326                return ERROR_WITH_CONTENT_PAGE;
 327             return ERROR_UNRECOVERABLE;
 328          }
 329          URI Uri = Queue->Uri;
 330          // same protocol redirects are okay
 331          if (tmpURI.Access == Uri.Access)
 332             return TRY_AGAIN_OR_REDIRECT;
 333          // as well as http to https
 334          else if ((Uri.Access == "http" || Uri.Access == "https+http") && tmpURI.Access == "https")
 335             return TRY_AGAIN_OR_REDIRECT;
 336          else
 337             _error->Error("Redirection from %s to '%s' is forbidden", Uri.Access.c_str(), NextURI.c_str());
 338       }
 339       /* else pass through for error message */
 340    }
 341    // retry after an invalid range response without partial data
 342    else if (Server->Result == 416)
 343    {
 344       struct stat SBuf;
 345       if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 346       {
 347          bool partialHit = false;
 348          if (Queue->ExpectedHashes.usable() == true)
 349          {
 350             Hashes resultHashes(Queue->ExpectedHashes);
 351             FileFd file(Queue->DestFile, FileFd::ReadOnly);
 352             Server->TotalFileSize = file.FileSize();
 353             Server->Date = file.ModificationTime();
 354             resultHashes.AddFD(file);
 355             HashStringList const hashList = resultHashes.GetHashStringList();
 356             partialHit = (Queue->ExpectedHashes == hashList);
 357          }
 358          else if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
 359             partialHit = true;
 360          if (partialHit == true)
 361          {
 362             // the file is completely downloaded, but was not moved
 363             if (Server->HaveContent == true)
 364             {
 365                // nuke the sent error page
 366                Server->RunDataToDevNull();
 367                Server->HaveContent = false;
 368             }
 369             Server->StartPos = Server->TotalFileSize;
 370             Server->Result = 200;
 371          }
 372          else if (RemoveFile("server", Queue->DestFile))
 373          {
 374             NextURI = Queue->Uri;
 375             return TRY_AGAIN_OR_REDIRECT;
 376          }
 377       }
 378    }
 379
 380    /* We have a reply we don't handle. This should indicate a perm server
 381       failure */
 382    if (Server->Result < 200 || Server->Result >= 300)
 383    {
 384       if (_error->PendingError() == false)
 385       {
 386          std::string err;
 387          strprintf(err, "HttpError%u", Server->Result);
 388          SetFailReason(err);
 389          _error->Error("%u %s", Server->Result, Server->Code);
 390       }
 391       if (Server->HaveContent == true)
 392          return ERROR_WITH_CONTENT_PAGE;
 393       return ERROR_UNRECOVERABLE;
 394    }
 395
 396    // This is some sort of 2xx 'data follows' reply
 397    Res.LastModified = Server->Date;
 398    Res.Size = Server->TotalFileSize;
 399    return FILE_IS_OPEN;
 400 }
 401                                                                         /*}}}*/
 402 // ServerMethod::SigTerm - Handle a fatal signal                        /*{{{*/
 403 // ---------------------------------------------------------------------
 404 /* This closes and timestamps the open file. This is necessary to get
 405    resume behavoir on user abort */
 406 void ServerMethod::SigTerm(int)
 407 {
 408    if (FailFd == -1)
 409       _exit(100);
 410
 411    struct timeval times[2];
 412    times[0].tv_sec = FailTime;
 413    times[1].tv_sec = FailTime;
 414    times[0].tv_usec = times[1].tv_usec = 0;
 415    utimes(FailFile.c_str(), times);
 416    close(FailFd);
 417
 418    _exit(100);
 419 }
 420                                                                         /*}}}*/
 421 // ServerMethod::Fetch - Fetch an item                                  /*{{{*/
 422 // ---------------------------------------------------------------------
 423 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 424    depth. */
 425 bool ServerMethod::Fetch(FetchItem *)
 426 {
 427    if (Server == nullptr || QueueBack == nullptr)
 428       return true;
 429
 430    // If pipelining is disabled, we only queue 1 request
 431    auto const AllowedDepth = Server->Pipeline ? PipelineDepth : 0;
 432    // how deep is our pipeline currently?
 433    decltype(PipelineDepth) CurrentDepth = 0;
 434    for (FetchItem const *I = Queue; I != QueueBack; I = I->Next)
 435       ++CurrentDepth;
 436    if (CurrentDepth > AllowedDepth)
 437       return true;
 438
 439    do {
 440       // Make sure we stick with the same server
 441       if (Server->Comp(QueueBack->Uri) == false)
 442          break;
 443
 444       bool const UsableHashes = QueueBack->ExpectedHashes.usable();
 445       // if we have no hashes, do at most one such request
 446       // as we can't fixup pipeling misbehaviors otherwise
 447       if (CurrentDepth != 0 && UsableHashes == false)
 448          break;
 449
 450       if (UsableHashes && FileExists(QueueBack->DestFile))
 451       {
 452          FileFd partial(QueueBack->DestFile, FileFd::ReadOnly);
 453          Hashes wehave(QueueBack->ExpectedHashes);
 454          if (QueueBack->ExpectedHashes.FileSize() == partial.FileSize())
 455          {
 456             if (wehave.AddFD(partial) &&
 457                   wehave.GetHashStringList() == QueueBack->ExpectedHashes)
 458             {
 459                FetchResult Res;
 460                Res.Filename = QueueBack->DestFile;
 461                Res.ResumePoint = QueueBack->ExpectedHashes.FileSize();
 462                URIStart(Res);
 463                // move item to the start of the queue as URIDone will
 464                // always dequeued the first item in the queue
 465                if (Queue != QueueBack)
 466                {
 467                   FetchItem *Prev = Queue;
 468                   for (; Prev->Next != QueueBack; Prev = Prev->Next)
 469                      /* look for the previous queue item */;
 470                   Prev->Next = QueueBack->Next;
 471                   QueueBack->Next = Queue;
 472                   Queue = QueueBack;
 473                   QueueBack = Prev->Next;
 474                }
 475                Res.TakeHashes(wehave);
 476                URIDone(Res);
 477                continue;
 478             }
 479             else
 480                RemoveFile("Fetch-Partial", QueueBack->DestFile);
 481          }
 482       }
 483       auto const Tmp = QueueBack;
 484       QueueBack = QueueBack->Next;
 485       SendReq(Tmp);
 486       ++CurrentDepth;
 487    } while (CurrentDepth <= AllowedDepth && QueueBack != nullptr);
 488
 489    return true;
 490 }
 491                                                                         /*}}}*/
 492 // ServerMethod::Loop - Main loop                                       /*{{{*/
 493 int ServerMethod::Loop()
 494 {
 495    signal(SIGTERM,SigTerm);
 496    signal(SIGINT,SigTerm);
 497
 498    Server = 0;
 499
 500    int FailCounter = 0;
 501    while (1)
 502    {
 503       // We have no commands, wait for some to arrive
 504       if (Queue == 0)
 505       {
 506          if (WaitFd(STDIN_FILENO) == false)
 507             return 0;
 508       }
 509
 510       /* Run messages, we can accept 0 (no message) if we didn't
 511          do a WaitFd above.. Otherwise the FD is closed. */
 512       int Result = Run(true);
 513       if (Result != -1 && (Result != 0 || Queue == 0))
 514       {
 515          if(FailReason.empty() == false ||
 516             _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 517             return 100;
 518          else
 519             return 0;
 520       }
 521
 522       if (Queue == 0)
 523          continue;
 524
 525       // Connect to the server
 526       if (Server == 0 || Server->Comp(Queue->Uri) == false)
 527          Server = CreateServerState(Queue->Uri);
 528
 529       /* If the server has explicitly said this is the last connection
 530          then we pre-emptively shut down the pipeline and tear down
 531          the connection. This will speed up HTTP/1.0 servers a tad
 532          since we don't have to wait for the close sequence to
 533          complete */
 534       if (Server->Persistent == false)
 535          Server->Close();
 536
 537       // Reset the pipeline
 538       if (Server->IsOpen() == false)
 539          QueueBack = Queue;
 540
 541       // Connnect to the host
 542       if (Server->Open() == false)
 543       {
 544          Fail(true);
 545          Server = nullptr;
 546          continue;
 547       }
 548
 549       // Fill the pipeline.
 550       Fetch(0);
 551
 552       // Fetch the next URL header data from the server.
 553       switch (Server->RunHeaders(File, Queue->Uri))
 554       {
 555          case ServerState::RUN_HEADERS_OK:
 556          break;
 557
 558          // The header data is bad
 559          case ServerState::RUN_HEADERS_PARSE_ERROR:
 560          {
 561             _error->Error(_("Bad header data"));
 562             Fail(true);
 563             Server->Close();
 564             RotateDNS();
 565             continue;
 566          }
 567
 568          // The server closed a connection during the header get..
 569          default:
 570          case ServerState::RUN_HEADERS_IO_ERROR:
 571          {
 572             FailCounter++;
 573             _error->Discard();
 574             Server->Close();
 575             Server->Pipeline = false;
 576             Server->PipelineAllowed = false;
 577
 578             if (FailCounter >= 2)
 579             {
 580                Fail(_("Connection failed"),true);
 581                FailCounter = 0;
 582             }
 583
 584             RotateDNS();
 585             continue;
 586          }
 587       };
 588
 589       // Decide what to do.
 590       FetchResult Res;
 591       Res.Filename = Queue->DestFile;
 592       switch (DealWithHeaders(Res))
 593       {
 594          // Ok, the file is Open
 595          case FILE_IS_OPEN:
 596          {
 597             URIStart(Res);
 598
 599             // Run the data
 600             bool Result = true;
 601
 602             // ensure we don't fetch too much
 603             // we could do "Server->MaximumSize = Queue->MaximumSize" here
 604             // but that would break the clever pipeline messup detection
 605             // so instead we use the size of the biggest item in the queue
 606             Server->MaximumSize = FindMaximumObjectSizeInQueue();
 607
 608             if (Server->HaveContent)
 609                Result = Server->RunData(File);
 610
 611             /* If the server is sending back sizeless responses then fill in
 612                the size now */
 613             if (Res.Size == 0)
 614                Res.Size = File->Size();
 615
 616             // Close the file, destroy the FD object and timestamp it
 617             FailFd = -1;
 618             delete File;
 619             File = 0;
 620
 621             // Timestamp
 622             struct timeval times[2];
 623             times[0].tv_sec = times[1].tv_sec = Server->Date;
 624             times[0].tv_usec = times[1].tv_usec = 0;
 625             utimes(Queue->DestFile.c_str(), times);
 626
 627             // Send status to APT
 628             if (Result == true)
 629             {
 630                Hashes * const resultHashes = Server->GetHashes();
 631                HashStringList const hashList = resultHashes->GetHashStringList();
 632                if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
 633                {
 634                   // we did not get the expected hash… mhhh:
 635                   // could it be that server/proxy messed up pipelining?
 636                   FetchItem * BeforeI = Queue;
 637                   for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
 638                   {
 639                      if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
 640                      {
 641                         // yes, he did! Disable pipelining and rewrite queue
 642                         if (Server->Pipeline == true)
 643                         {
 644                            Warning(_("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::Pipeline-Depth");
 645                            Server->Pipeline = false;
 646                            Server->PipelineAllowed = false;
 647                            // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
 648                         }
 649                         Rename(Res.Filename, I->DestFile);
 650                         Res.Filename = I->DestFile;
 651                         BeforeI->Next = I->Next;
 652                         I->Next = Queue;
 653                         Queue = I;
 654                         break;
 655                      }
 656                      BeforeI = I;
 657                   }
 658                }
 659                Res.TakeHashes(*resultHashes);
 660                URIDone(Res);
 661             }
 662             else
 663             {
 664                if (Server->IsOpen() == false)
 665                {
 666                   FailCounter++;
 667                   _error->Discard();
 668                   Server->Close();
 669
 670                   if (FailCounter >= 2)
 671                   {
 672                      Fail(_("Connection failed"),true);
 673                      FailCounter = 0;
 674                   }
 675
 676                   QueueBack = Queue;
 677                }
 678                else
 679                {
 680                   Server->Close();
 681                   Fail(true);
 682                }
 683             }
 684             break;
 685          }
 686
 687          // IMS hit
 688          case IMS_HIT:
 689          {
 690             URIDone(Res);
 691             break;
 692          }
 693
 694          // Hard server error, not found or something
 695          case ERROR_UNRECOVERABLE:
 696          {
 697             Fail();
 698             break;
 699          }
 700
 701          // Hard internal error, kill the connection and fail
 702          case ERROR_NOT_FROM_SERVER:
 703          {
 704             delete File;
 705             File = 0;
 706
 707             Fail();
 708             RotateDNS();
 709             Server->Close();
 710             break;
 711          }
 712
 713          // We need to flush the data, the header is like a 404 w/ error text
 714          case ERROR_WITH_CONTENT_PAGE:
 715          {
 716             Fail();
 717             Server->RunDataToDevNull();
 718             break;
 719          }
 720
 721          // Try again with a new URL
 722          case TRY_AGAIN_OR_REDIRECT:
 723          {
 724             // Clear rest of response if there is content
 725             if (Server->HaveContent)
 726                Server->RunDataToDevNull();
 727             Redirect(NextURI);
 728             break;
 729          }
 730
 731          default:
 732          Fail(_("Internal error"));
 733          break;
 734       }
 735
 736       FailCounter = 0;
 737    }
 738
 739    return 0;
 740 }
 741                                                                         /*}}}*/
 742 unsigned long long ServerMethod::FindMaximumObjectSizeInQueue() const   /*{{{*/
 743 {
 744    unsigned long long MaxSizeInQueue = 0;
 745    for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
 746       MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
 747    return MaxSizeInQueue;
 748 }
 749                                                                         /*}}}*/
 750 ServerMethod::ServerMethod(char const * const Binary, char const * const Ver,unsigned long const Flags) :/*{{{*/
 751    aptMethod(Binary, Ver, Flags), Server(nullptr), File(NULL), PipelineDepth(10),
 752    AllowRedirect(false), Debug(false)
 753 {
 754 }
 755                                                                         /*}}}*/