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