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/acquire-method.h>
  14 #include <apt-pkg/configuration.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/fileutl.h>
  17 #include <apt-pkg/strutl.h>
  18
  19 #include <ctype.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <sys/stat.h>
  24 #include <sys/time.h>
  25 #include <time.h>
  26 #include <unistd.h>
  27 #include <iostream>
  28 #include <limits>
  29 #include <map>
  30 #include <string>
  31 #include <vector>
  32
  33 #include "server.h"
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37 using namespace std;
  38
  39 string ServerMethod::FailFile;
  40 int ServerMethod::FailFd = -1;
  41 time_t ServerMethod::FailTime = 0;
  42
  43 // ServerState::RunHeaders - Get the headers before the data            /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
  46    parse error occurred */
  47 ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File,
  48                                                       const std::string &Uri)
  49 {
  50    State = Header;
  51
  52    Owner->Status(_("Waiting for headers"));
  53
  54    Major = 0;
  55    Minor = 0;
  56    Result = 0;
  57    TotalFileSize = 0;
  58    JunkSize = 0;
  59    StartPos = 0;
  60    Encoding = Closes;
  61    HaveContent = false;
  62    time(&Date);
  63
  64    do
  65    {
  66       string Data;
  67       if (ReadHeaderLines(Data) == false)
  68          continue;
  69
  70       if (Owner->Debug == true)
  71          clog << "Answer for: " << Uri << endl << Data;
  72
  73       for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
  74       {
  75          string::const_iterator J = I;
  76          for (; J != Data.end() && *J != '\n' && *J != '\r'; ++J);
  77          if (HeaderLine(string(I,J)) == false)
  78             return RUN_HEADERS_PARSE_ERROR;
  79          I = J;
  80       }
  81
  82       // 100 Continue is a Nop...
  83       if (Result == 100)
  84          continue;
  85
  86       // Tidy up the connection persistence state.
  87       if (Encoding == Closes && HaveContent == true)
  88          Persistent = false;
  89
  90       return RUN_HEADERS_OK;
  91    }
  92    while (LoadNextResponse(false, File) == true);
  93
  94    return RUN_HEADERS_IO_ERROR;
  95 }
  96                                                                         /*}}}*/
  97 // ServerState::HeaderLine - Process a header line                      /*{{{*/
  98 // ---------------------------------------------------------------------
  99 /* */
 100 bool ServerState::HeaderLine(string Line)
 101 {
 102    if (Line.empty() == true)
 103       return true;
 104
 105    string::size_type Pos = Line.find(' ');
 106    if (Pos == string::npos || Pos+1 > Line.length())
 107    {
 108       // Blah, some servers use "connection:closes", evil.
 109       Pos = Line.find(':');
 110       if (Pos == string::npos || Pos + 2 > Line.length())
 111          return _error->Error(_("Bad header line"));
 112       Pos++;
 113    }
 114
 115    // Parse off any trailing spaces between the : and the next word.
 116    string::size_type Pos2 = Pos;
 117    while (Pos2 < Line.length() && isspace_ascii(Line[Pos2]) != 0)
 118       Pos2++;
 119
 120    string Tag = string(Line,0,Pos);
 121    string Val = string(Line,Pos2);
 122
 123    if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
 124    {
 125       // Evil servers return no version
 126       if (Line[4] == '/')
 127       {
 128          int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
 129          if (elements == 3)
 130          {
 131             Code[0] = '\0';
 132             if (Owner != NULL && Owner->Debug == true)
 133                clog << "HTTP server doesn't give Reason-Phrase for " << Result << std::endl;
 134          }
 135          else if (elements != 4)
 136             return _error->Error(_("The HTTP server sent an invalid reply header"));
 137       }
 138       else
 139       {
 140          Major = 0;
 141          Minor = 9;
 142          if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
 143             return _error->Error(_("The HTTP server sent an invalid reply header"));
 144       }
 145
 146       /* Check the HTTP response header to get the default persistence
 147          state. */
 148       if (Major < 1)
 149          Persistent = false;
 150       else
 151       {
 152          if (Major == 1 && Minor == 0)
 153          {
 154             Persistent = false;
 155          }
 156          else
 157          {
 158             Persistent = true;
 159             if (PipelineAllowed)
 160                Pipeline = true;
 161          }
 162       }
 163
 164       return true;
 165    }
 166
 167    if (stringcasecmp(Tag,"Content-Length:") == 0)
 168    {
 169       if (Encoding == Closes)
 170          Encoding = Stream;
 171       HaveContent = true;
 172
 173       unsigned long long * DownloadSizePtr = &DownloadSize;
 174       if (Result == 416)
 175          DownloadSizePtr = &JunkSize;
 176
 177       *DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
 178       if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
 179          return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
 180       else if (*DownloadSizePtr == 0)
 181          HaveContent = false;
 182
 183       // On partial content (206) the Content-Length less than the real
 184       // size, so do not set it here but leave that to the Content-Range
 185       // header instead
 186       if(Result != 206 && TotalFileSize == 0)
 187          TotalFileSize = DownloadSize;
 188
 189       return true;
 190    }
 191
 192    if (stringcasecmp(Tag,"Content-Type:") == 0)
 193    {
 194       HaveContent = true;
 195       return true;
 196    }
 197
 198    if (stringcasecmp(Tag,"Content-Range:") == 0)
 199    {
 200       HaveContent = true;
 201
 202       // §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
 203       if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&TotalFileSize) == 1)
 204          ; // we got the expected filesize which is all we wanted
 205       else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
 206          return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
 207       if ((unsigned long long)StartPos > TotalFileSize)
 208          return _error->Error(_("This HTTP server has broken range support"));
 209
 210       // figure out what we will download
 211       DownloadSize = TotalFileSize - StartPos;
 212       return true;
 213    }
 214
 215    if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
 216    {
 217       HaveContent = true;
 218       if (stringcasecmp(Val,"chunked") == 0)
 219          Encoding = Chunked;
 220       return true;
 221    }
 222
 223    if (stringcasecmp(Tag,"Connection:") == 0)
 224    {
 225       if (stringcasecmp(Val,"close") == 0)
 226          Persistent = false;
 227       if (stringcasecmp(Val,"keep-alive") == 0)
 228          Persistent = true;
 229       return true;
 230    }
 231
 232    if (stringcasecmp(Tag,"Last-Modified:") == 0)
 233    {
 234       if (RFC1123StrToTime(Val.c_str(), Date) == false)
 235          return _error->Error(_("Unknown date format"));
 236       return true;
 237    }
 238
 239    if (stringcasecmp(Tag,"Location:") == 0)
 240    {
 241       Location = Val;
 242       return true;
 243    }
 244
 245    return true;
 246 }
 247                                                                         /*}}}*/
 248 // ServerState::ServerState - Constructor                               /*{{{*/
 249 ServerState::ServerState(URI Srv, ServerMethod *Owner) :
 250    DownloadSize(0), ServerName(Srv), TimeOut(120), Owner(Owner)
 251 {
 252    Reset();
 253 }
 254                                                                         /*}}}*/
 255 bool ServerState::AddPartialFileToHashes(FileFd &File)                  /*{{{*/
 256 {
 257    File.Truncate(StartPos);
 258    return GetHashes()->AddFD(File, StartPos);
 259 }
 260                                                                         /*}}}*/
 261
 262 // ServerMethod::DealWithHeaders - Handle the retrieved header data     /*{{{*/
 263 // ---------------------------------------------------------------------
 264 /* We look at the header data we got back from the server and decide what
 265    to do. Returns DealWithHeadersResult (see http.h for details).
 266  */
 267 ServerMethod::DealWithHeadersResult
 268 ServerMethod::DealWithHeaders(FetchResult &Res)
 269 {
 270    // Not Modified
 271    if (Server->Result == 304)
 272    {
 273       RemoveFile("server", Queue->DestFile);
 274       Res.IMSHit = true;
 275       Res.LastModified = Queue->LastModified;
 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       else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
 294       {
 295          URI Uri = Queue->Uri;
 296          if (Uri.Host.empty() == false)
 297             NextURI = URI::SiteOnly(Uri);
 298          else
 299             NextURI.clear();
 300          NextURI.append(DeQuoteString(Server->Location));
 301          return TRY_AGAIN_OR_REDIRECT;
 302       }
 303       else
 304       {
 305          NextURI = DeQuoteString(Server->Location);
 306          URI tmpURI = NextURI;
 307          URI Uri = Queue->Uri;
 308          // same protocol redirects are okay
 309          if (tmpURI.Access == Uri.Access)
 310             return TRY_AGAIN_OR_REDIRECT;
 311          // as well as http to https
 312          else if (Uri.Access == "http" && tmpURI.Access == "https")
 313             return TRY_AGAIN_OR_REDIRECT;
 314       }
 315       /* else pass through for error message */
 316    }
 317    // retry after an invalid range response without partial data
 318    else if (Server->Result == 416)
 319    {
 320       struct stat SBuf;
 321       if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 322       {
 323          bool partialHit = false;
 324          if (Queue->ExpectedHashes.usable() == true)
 325          {
 326             Hashes resultHashes(Queue->ExpectedHashes);
 327             FileFd file(Queue->DestFile, FileFd::ReadOnly);
 328             Server->TotalFileSize = file.FileSize();
 329             Server->Date = file.ModificationTime();
 330             resultHashes.AddFD(file);
 331             HashStringList const hashList = resultHashes.GetHashStringList();
 332             partialHit = (Queue->ExpectedHashes == hashList);
 333          }
 334          else if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
 335             partialHit = true;
 336          if (partialHit == true)
 337          {
 338             // the file is completely downloaded, but was not moved
 339             if (Server->HaveContent == true)
 340             {
 341                // Send to error page to dev/null
 342                FileFd DevNull("/dev/null",FileFd::WriteExists);
 343                Server->RunData(&DevNull);
 344             }
 345             Server->HaveContent = false;
 346             Server->StartPos = Server->TotalFileSize;
 347             Server->Result = 200;
 348          }
 349          else if (RemoveFile("server", Queue->DestFile))
 350          {
 351             NextURI = Queue->Uri;
 352             return TRY_AGAIN_OR_REDIRECT;
 353          }
 354       }
 355    }
 356
 357    /* We have a reply we don't handle. This should indicate a perm server
 358       failure */
 359    if (Server->Result < 200 || Server->Result >= 300)
 360    {
 361       std::string err;
 362       strprintf(err, "HttpError%u", Server->Result);
 363       SetFailReason(err);
 364       _error->Error("%u %s", Server->Result, Server->Code);
 365       if (Server->HaveContent == true)
 366          return ERROR_WITH_CONTENT_PAGE;
 367       return ERROR_UNRECOVERABLE;
 368    }
 369
 370    // This is some sort of 2xx 'data follows' reply
 371    Res.LastModified = Server->Date;
 372    Res.Size = Server->TotalFileSize;
 373
 374    // Open the file
 375    delete File;
 376    File = new FileFd(Queue->DestFile,FileFd::WriteAny);
 377    if (_error->PendingError() == true)
 378       return ERROR_NOT_FROM_SERVER;
 379
 380    FailFile = Queue->DestFile;
 381    FailFile.c_str();   // Make sure we don't do a malloc in the signal handler
 382    FailFd = File->Fd();
 383    FailTime = Server->Date;
 384
 385    if (Server->InitHashes(Queue->ExpectedHashes) == false || Server->AddPartialFileToHashes(*File) == false)
 386    {
 387       _error->Errno("read",_("Problem hashing file"));
 388       return ERROR_NOT_FROM_SERVER;
 389    }
 390    if (Server->StartPos > 0)
 391       Res.ResumePoint = Server->StartPos;
 392
 393    SetNonBlock(File->Fd(),true);
 394    return FILE_IS_OPEN;
 395 }
 396                                                                         /*}}}*/
 397 // ServerMethod::SigTerm - Handle a fatal signal                        /*{{{*/
 398 // ---------------------------------------------------------------------
 399 /* This closes and timestamps the open file. This is necessary to get
 400    resume behavoir on user abort */
 401 void ServerMethod::SigTerm(int)
 402 {
 403    if (FailFd == -1)
 404       _exit(100);
 405
 406    struct timeval times[2];
 407    times[0].tv_sec = FailTime;
 408    times[1].tv_sec = FailTime;
 409    times[0].tv_usec = times[1].tv_usec = 0;
 410    utimes(FailFile.c_str(), times);
 411    close(FailFd);
 412
 413    _exit(100);
 414 }
 415                                                                         /*}}}*/
 416 // ServerMethod::Fetch - Fetch an item                                  /*{{{*/
 417 // ---------------------------------------------------------------------
 418 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 419    depth. */
 420 bool ServerMethod::Fetch(FetchItem *)
 421 {
 422    if (Server == 0)
 423       return true;
 424
 425    // Queue the requests
 426    int Depth = -1;
 427    for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
 428         I = I->Next, Depth++)
 429    {
 430       if (Depth >= 0)
 431       {
 432          // If pipelining is disabled, we only queue 1 request
 433          if (Server->Pipeline == false)
 434             break;
 435          // if we have no hashes, do at most one such request
 436          // as we can't fixup pipeling misbehaviors otherwise
 437          else if (I->ExpectedHashes.usable() == false)
 438             break;
 439       }
 440
 441       // Make sure we stick with the same server
 442       if (Server->Comp(I->Uri) == false)
 443          break;
 444       if (QueueBack == I)
 445       {
 446          QueueBack = I->Next;
 447          SendReq(I);
 448          continue;
 449       }
 450    }
 451
 452    return true;
 453 }
 454                                                                         /*}}}*/
 455 // ServerMethod::Loop - Main loop                                       /*{{{*/
 456 int ServerMethod::Loop()
 457 {
 458    typedef vector<string> StringVector;
 459    typedef vector<string>::iterator StringVectorIterator;
 460    map<string, StringVector> Redirected;
 461
 462    signal(SIGTERM,SigTerm);
 463    signal(SIGINT,SigTerm);
 464
 465    Server = 0;
 466
 467    int FailCounter = 0;
 468    while (1)
 469    {
 470       // We have no commands, wait for some to arrive
 471       if (Queue == 0)
 472       {
 473          if (WaitFd(STDIN_FILENO) == false)
 474             return 0;
 475       }
 476
 477       /* Run messages, we can accept 0 (no message) if we didn't
 478          do a WaitFd above.. Otherwise the FD is closed. */
 479       int Result = Run(true);
 480       if (Result != -1 && (Result != 0 || Queue == 0))
 481       {
 482          if(FailReason.empty() == false ||
 483             _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 484             return 100;
 485          else
 486             return 0;
 487       }
 488
 489       if (Queue == 0)
 490          continue;
 491
 492       // Connect to the server
 493       if (Server == 0 || Server->Comp(Queue->Uri) == false)
 494          Server = CreateServerState(Queue->Uri);
 495
 496       /* If the server has explicitly said this is the last connection
 497          then we pre-emptively shut down the pipeline and tear down
 498          the connection. This will speed up HTTP/1.0 servers a tad
 499          since we don't have to wait for the close sequence to
 500          complete */
 501       if (Server->Persistent == false)
 502          Server->Close();
 503
 504       // Reset the pipeline
 505       if (Server->IsOpen() == false)
 506          QueueBack = Queue;
 507
 508       // Connnect to the host
 509       if (Server->Open() == false)
 510       {
 511          Fail(true);
 512          Server = nullptr;
 513          continue;
 514       }
 515
 516       // Fill the pipeline.
 517       Fetch(0);
 518
 519       // Fetch the next URL header data from the server.
 520       switch (Server->RunHeaders(File, Queue->Uri))
 521       {
 522          case ServerState::RUN_HEADERS_OK:
 523          break;
 524
 525          // The header data is bad
 526          case ServerState::RUN_HEADERS_PARSE_ERROR:
 527          {
 528             _error->Error(_("Bad header data"));
 529             Fail(true);
 530             RotateDNS();
 531             continue;
 532          }
 533
 534          // The server closed a connection during the header get..
 535          default:
 536          case ServerState::RUN_HEADERS_IO_ERROR:
 537          {
 538             FailCounter++;
 539             _error->Discard();
 540             Server->Close();
 541             Server->Pipeline = false;
 542             Server->PipelineAllowed = false;
 543
 544             if (FailCounter >= 2)
 545             {
 546                Fail(_("Connection failed"),true);
 547                FailCounter = 0;
 548             }
 549
 550             RotateDNS();
 551             continue;
 552          }
 553       };
 554
 555       // Decide what to do.
 556       FetchResult Res;
 557       Res.Filename = Queue->DestFile;
 558       switch (DealWithHeaders(Res))
 559       {
 560          // Ok, the file is Open
 561          case FILE_IS_OPEN:
 562          {
 563             URIStart(Res);
 564
 565             // Run the data
 566             bool Result = true;
 567
 568             // ensure we don't fetch too much
 569             // we could do "Server->MaximumSize = Queue->MaximumSize" here
 570             // but that would break the clever pipeline messup detection
 571             // so instead we use the size of the biggest item in the queue
 572             Server->MaximumSize = FindMaximumObjectSizeInQueue();
 573
 574             if (Server->HaveContent)
 575                Result = Server->RunData(File);
 576
 577             /* If the server is sending back sizeless responses then fill in
 578                the size now */
 579             if (Res.Size == 0)
 580                Res.Size = File->Size();
 581
 582             // Close the file, destroy the FD object and timestamp it
 583             FailFd = -1;
 584             delete File;
 585             File = 0;
 586
 587             // Timestamp
 588             struct timeval times[2];
 589             times[0].tv_sec = times[1].tv_sec = Server->Date;
 590             times[0].tv_usec = times[1].tv_usec = 0;
 591             utimes(Queue->DestFile.c_str(), times);
 592
 593             // Send status to APT
 594             if (Result == true)
 595             {
 596                Hashes * const resultHashes = Server->GetHashes();
 597                HashStringList const hashList = resultHashes->GetHashStringList();
 598                if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
 599                {
 600                   // we did not get the expected hash… mhhh:
 601                   // could it be that server/proxy messed up pipelining?
 602                   FetchItem * BeforeI = Queue;
 603                   for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
 604                   {
 605                      if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
 606                      {
 607                         // yes, he did! Disable pipelining and rewrite queue
 608                         if (Server->Pipeline == true)
 609                         {
 610                            // FIXME: fake a warning message as we have no proper way of communicating here
 611                            std::string out;
 612                            strprintf(out, _("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::PipelineDepth");
 613                            std::cerr << "W: " << out << std::endl;
 614                            Server->Pipeline = false;
 615                            Server->PipelineAllowed = false;
 616                            // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
 617                         }
 618                         Rename(Res.Filename, I->DestFile);
 619                         Res.Filename = I->DestFile;
 620                         BeforeI->Next = I->Next;
 621                         I->Next = Queue;
 622                         Queue = I;
 623                         break;
 624                      }
 625                      BeforeI = I;
 626                   }
 627                }
 628                Res.TakeHashes(*resultHashes);
 629                URIDone(Res);
 630             }
 631             else
 632             {
 633                if (Server->IsOpen() == false)
 634                {
 635                   FailCounter++;
 636                   _error->Discard();
 637                   Server->Close();
 638
 639                   if (FailCounter >= 2)
 640                   {
 641                      Fail(_("Connection failed"),true);
 642                      FailCounter = 0;
 643                   }
 644
 645                   QueueBack = Queue;
 646                }
 647                else
 648                {
 649                   Server->Close();
 650                   Fail(true);
 651                }
 652             }
 653             break;
 654          }
 655
 656          // IMS hit
 657          case IMS_HIT:
 658          {
 659             URIDone(Res);
 660             break;
 661          }
 662
 663          // Hard server error, not found or something
 664          case ERROR_UNRECOVERABLE:
 665          {
 666             Fail();
 667             break;
 668          }
 669
 670          // Hard internal error, kill the connection and fail
 671          case ERROR_NOT_FROM_SERVER:
 672          {
 673             delete File;
 674             File = 0;
 675
 676             Fail();
 677             RotateDNS();
 678             Server->Close();
 679             break;
 680          }
 681
 682          // We need to flush the data, the header is like a 404 w/ error text
 683          case ERROR_WITH_CONTENT_PAGE:
 684          {
 685             Fail();
 686
 687             // Send to content to dev/null
 688             File = new FileFd("/dev/null",FileFd::WriteExists);
 689             Server->RunData(File);
 690             delete File;
 691             File = 0;
 692             break;
 693          }
 694
 695          // Try again with a new URL
 696          case TRY_AGAIN_OR_REDIRECT:
 697          {
 698             // Clear rest of response if there is content
 699             if (Server->HaveContent)
 700             {
 701                File = new FileFd("/dev/null",FileFd::WriteExists);
 702                Server->RunData(File);
 703                delete File;
 704                File = 0;
 705             }
 706
 707             /* Detect redirect loops.  No more redirects are allowed
 708                after the same URI is seen twice in a queue item. */
 709             StringVector &R = Redirected[Queue->DestFile];
 710             bool StopRedirects = false;
 711             if (R.empty() == true)
 712                R.push_back(Queue->Uri);
 713             else if (R[0] == "STOP" || R.size() > 10)
 714                StopRedirects = true;
 715             else
 716             {
 717                for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
 718                   if (Queue->Uri == *I)
 719                   {
 720                      R[0] = "STOP";
 721                      break;
 722                   }
 723
 724                R.push_back(Queue->Uri);
 725             }
 726
 727             if (StopRedirects == false)
 728                Redirect(NextURI);
 729             else
 730                Fail();
 731
 732             break;
 733          }
 734
 735          default:
 736          Fail(_("Internal error"));
 737          break;
 738       }
 739
 740       FailCounter = 0;
 741    }
 742
 743    return 0;
 744 }
 745                                                                         /*}}}*/
 746 unsigned long long ServerMethod::FindMaximumObjectSizeInQueue() const   /*{{{*/
 747 {
 748    unsigned long long MaxSizeInQueue = 0;
 749    for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
 750       MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
 751    return MaxSizeInQueue;
 752 }
 753                                                                         /*}}}*/
 754 ServerMethod::ServerMethod(char const * const Binary, char const * const Ver,unsigned long const Flags) :/*{{{*/
 755    aptMethod(Binary, Ver, Flags), Server(nullptr), File(NULL), PipelineDepth(10),
 756    AllowRedirect(false), Debug(false)
 757 {
 758 }
 759                                                                         /*}}}*/