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) : 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       return IMS_HIT;
 276    }
 277
 278    /* Redirect
 279     *
 280     * Note that it is only OK for us to treat all redirection the same
 281     * because we *always* use GET, not other HTTP methods.  There are
 282     * three redirection codes for which it is not appropriate that we
 283     * redirect.  Pass on those codes so the error handling kicks in.
 284     */
 285    if (AllowRedirect
 286        && (Server->Result > 300 && Server->Result < 400)
 287        && (Server->Result != 300       // Multiple Choices
 288            && Server->Result != 304    // Not Modified
 289            && Server->Result != 306))  // (Not part of HTTP/1.1, reserved)
 290    {
 291       if (Server->Location.empty() == true);
 292       else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
 293       {
 294          URI Uri = Queue->Uri;
 295          if (Uri.Host.empty() == false)
 296             NextURI = URI::SiteOnly(Uri);
 297          else
 298             NextURI.clear();
 299          NextURI.append(DeQuoteString(Server->Location));
 300          return TRY_AGAIN_OR_REDIRECT;
 301       }
 302       else
 303       {
 304          NextURI = DeQuoteString(Server->Location);
 305          URI tmpURI = NextURI;
 306          URI Uri = Queue->Uri;
 307          // same protocol redirects are okay
 308          if (tmpURI.Access == Uri.Access)
 309             return TRY_AGAIN_OR_REDIRECT;
 310          // as well as http to https
 311          else if (Uri.Access == "http" && tmpURI.Access == "https")
 312             return TRY_AGAIN_OR_REDIRECT;
 313       }
 314       /* else pass through for error message */
 315    }
 316    // retry after an invalid range response without partial data
 317    else if (Server->Result == 416)
 318    {
 319       struct stat SBuf;
 320       if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 321       {
 322          bool partialHit = false;
 323          if (Queue->ExpectedHashes.usable() == true)
 324          {
 325             Hashes resultHashes(Queue->ExpectedHashes);
 326             FileFd file(Queue->DestFile, FileFd::ReadOnly);
 327             Server->TotalFileSize = file.FileSize();
 328             Server->Date = file.ModificationTime();
 329             resultHashes.AddFD(file);
 330             HashStringList const hashList = resultHashes.GetHashStringList();
 331             partialHit = (Queue->ExpectedHashes == hashList);
 332          }
 333          else if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
 334             partialHit = true;
 335          if (partialHit == true)
 336          {
 337             // the file is completely downloaded, but was not moved
 338             if (Server->HaveContent == true)
 339             {
 340                // Send to error page to dev/null
 341                FileFd DevNull("/dev/null",FileFd::WriteExists);
 342                Server->RunData(&DevNull);
 343             }
 344             Server->HaveContent = false;
 345             Server->StartPos = Server->TotalFileSize;
 346             Server->Result = 200;
 347          }
 348          else if (RemoveFile("server", Queue->DestFile))
 349          {
 350             NextURI = Queue->Uri;
 351             return TRY_AGAIN_OR_REDIRECT;
 352          }
 353       }
 354    }
 355
 356    /* We have a reply we don't handle. This should indicate a perm server
 357       failure */
 358    if (Server->Result < 200 || Server->Result >= 300)
 359    {
 360       std::string err;
 361       strprintf(err, "HttpError%u", Server->Result);
 362       SetFailReason(err);
 363       _error->Error("%u %s", Server->Result, Server->Code);
 364       if (Server->HaveContent == true)
 365          return ERROR_WITH_CONTENT_PAGE;
 366       return ERROR_UNRECOVERABLE;
 367    }
 368
 369    // This is some sort of 2xx 'data follows' reply
 370    Res.LastModified = Server->Date;
 371    Res.Size = Server->TotalFileSize;
 372
 373    // Open the file
 374    delete File;
 375    File = new FileFd(Queue->DestFile,FileFd::WriteAny);
 376    if (_error->PendingError() == true)
 377       return ERROR_NOT_FROM_SERVER;
 378
 379    FailFile = Queue->DestFile;
 380    FailFile.c_str();   // Make sure we don't do a malloc in the signal handler
 381    FailFd = File->Fd();
 382    FailTime = Server->Date;
 383
 384    if (Server->InitHashes(Queue->ExpectedHashes) == false || Server->AddPartialFileToHashes(*File) == false)
 385    {
 386       _error->Errno("read",_("Problem hashing file"));
 387       return ERROR_NOT_FROM_SERVER;
 388    }
 389    if (Server->StartPos > 0)
 390       Res.ResumePoint = Server->StartPos;
 391
 392    SetNonBlock(File->Fd(),true);
 393    return FILE_IS_OPEN;
 394 }
 395                                                                         /*}}}*/
 396 // ServerMethod::SigTerm - Handle a fatal signal                        /*{{{*/
 397 // ---------------------------------------------------------------------
 398 /* This closes and timestamps the open file. This is necessary to get
 399    resume behavoir on user abort */
 400 void ServerMethod::SigTerm(int)
 401 {
 402    if (FailFd == -1)
 403       _exit(100);
 404
 405    struct timeval times[2];
 406    times[0].tv_sec = FailTime;
 407    times[1].tv_sec = FailTime;
 408    times[0].tv_usec = times[1].tv_usec = 0;
 409    utimes(FailFile.c_str(), times);
 410    close(FailFd);
 411
 412    _exit(100);
 413 }
 414                                                                         /*}}}*/
 415 // ServerMethod::Fetch - Fetch an item                                  /*{{{*/
 416 // ---------------------------------------------------------------------
 417 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 418    depth. */
 419 bool ServerMethod::Fetch(FetchItem *)
 420 {
 421    if (Server == 0)
 422       return true;
 423
 424    // Queue the requests
 425    int Depth = -1;
 426    for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
 427         I = I->Next, Depth++)
 428    {
 429       if (Depth >= 0)
 430       {
 431          // If pipelining is disabled, we only queue 1 request
 432          if (Server->Pipeline == false)
 433             break;
 434          // if we have no hashes, do at most one such request
 435          // as we can't fixup pipeling misbehaviors otherwise
 436          else if (I->ExpectedHashes.usable() == false)
 437             break;
 438       }
 439
 440       // Make sure we stick with the same server
 441       if (Server->Comp(I->Uri) == false)
 442          break;
 443       if (QueueBack == I)
 444       {
 445          QueueBack = I->Next;
 446          SendReq(I);
 447          continue;
 448       }
 449    }
 450
 451    return true;
 452 }
 453                                                                         /*}}}*/
 454 // ServerMethod::Loop - Main loop                                       /*{{{*/
 455 int ServerMethod::Loop()
 456 {
 457    typedef vector<string> StringVector;
 458    typedef vector<string>::iterator StringVectorIterator;
 459    map<string, StringVector> Redirected;
 460
 461    signal(SIGTERM,SigTerm);
 462    signal(SIGINT,SigTerm);
 463
 464    Server = 0;
 465
 466    int FailCounter = 0;
 467    while (1)
 468    {
 469       // We have no commands, wait for some to arrive
 470       if (Queue == 0)
 471       {
 472          if (WaitFd(STDIN_FILENO) == false)
 473             return 0;
 474       }
 475
 476       /* Run messages, we can accept 0 (no message) if we didn't
 477          do a WaitFd above.. Otherwise the FD is closed. */
 478       int Result = Run(true);
 479       if (Result != -1 && (Result != 0 || Queue == 0))
 480       {
 481          if(FailReason.empty() == false ||
 482             _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 483             return 100;
 484          else
 485             return 0;
 486       }
 487
 488       if (Queue == 0)
 489          continue;
 490
 491       // Connect to the server
 492       if (Server == 0 || Server->Comp(Queue->Uri) == false)
 493          Server = CreateServerState(Queue->Uri);
 494
 495       /* If the server has explicitly said this is the last connection
 496          then we pre-emptively shut down the pipeline and tear down
 497          the connection. This will speed up HTTP/1.0 servers a tad
 498          since we don't have to wait for the close sequence to
 499          complete */
 500       if (Server->Persistent == false)
 501          Server->Close();
 502
 503       // Reset the pipeline
 504       if (Server->IsOpen() == false)
 505          QueueBack = Queue;
 506
 507       // Connnect to the host
 508       if (Server->Open() == false)
 509       {
 510          Fail(true);
 511          Server = nullptr;
 512          continue;
 513       }
 514
 515       // Fill the pipeline.
 516       Fetch(0);
 517
 518       // Fetch the next URL header data from the server.
 519       switch (Server->RunHeaders(File, Queue->Uri))
 520       {
 521          case ServerState::RUN_HEADERS_OK:
 522          break;
 523
 524          // The header data is bad
 525          case ServerState::RUN_HEADERS_PARSE_ERROR:
 526          {
 527             _error->Error(_("Bad header data"));
 528             Fail(true);
 529             RotateDNS();
 530             continue;
 531          }
 532
 533          // The server closed a connection during the header get..
 534          default:
 535          case ServerState::RUN_HEADERS_IO_ERROR:
 536          {
 537             FailCounter++;
 538             _error->Discard();
 539             Server->Close();
 540             Server->Pipeline = false;
 541             Server->PipelineAllowed = false;
 542
 543             if (FailCounter >= 2)
 544             {
 545                Fail(_("Connection failed"),true);
 546                FailCounter = 0;
 547             }
 548
 549             RotateDNS();
 550             continue;
 551          }
 552       };
 553
 554       // Decide what to do.
 555       FetchResult Res;
 556       Res.Filename = Queue->DestFile;
 557       switch (DealWithHeaders(Res))
 558       {
 559          // Ok, the file is Open
 560          case FILE_IS_OPEN:
 561          {
 562             URIStart(Res);
 563
 564             // Run the data
 565             bool Result = true;
 566
 567             // ensure we don't fetch too much
 568             // we could do "Server->MaximumSize = Queue->MaximumSize" here
 569             // but that would break the clever pipeline messup detection
 570             // so instead we use the size of the biggest item in the queue
 571             Server->MaximumSize = FindMaximumObjectSizeInQueue();
 572
 573             if (Server->HaveContent)
 574                Result = Server->RunData(File);
 575
 576             /* If the server is sending back sizeless responses then fill in
 577                the size now */
 578             if (Res.Size == 0)
 579                Res.Size = File->Size();
 580
 581             // Close the file, destroy the FD object and timestamp it
 582             FailFd = -1;
 583             delete File;
 584             File = 0;
 585
 586             // Timestamp
 587             struct timeval times[2];
 588             times[0].tv_sec = times[1].tv_sec = Server->Date;
 589             times[0].tv_usec = times[1].tv_usec = 0;
 590             utimes(Queue->DestFile.c_str(), times);
 591
 592             // Send status to APT
 593             if (Result == true)
 594             {
 595                Hashes * const resultHashes = Server->GetHashes();
 596                HashStringList const hashList = resultHashes->GetHashStringList();
 597                if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
 598                {
 599                   // we did not get the expected hash… mhhh:
 600                   // could it be that server/proxy messed up pipelining?
 601                   FetchItem * BeforeI = Queue;
 602                   for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
 603                   {
 604                      if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
 605                      {
 606                         // yes, he did! Disable pipelining and rewrite queue
 607                         if (Server->Pipeline == true)
 608                         {
 609                            // FIXME: fake a warning message as we have no proper way of communicating here
 610                            std::string out;
 611                            strprintf(out, _("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::PipelineDepth");
 612                            std::cerr << "W: " << out << std::endl;
 613                            Server->Pipeline = false;
 614                            Server->PipelineAllowed = false;
 615                            // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
 616                         }
 617                         Rename(Res.Filename, I->DestFile);
 618                         Res.Filename = I->DestFile;
 619                         BeforeI->Next = I->Next;
 620                         I->Next = Queue;
 621                         Queue = I;
 622                         break;
 623                      }
 624                      BeforeI = I;
 625                   }
 626                }
 627                Res.TakeHashes(*resultHashes);
 628                URIDone(Res);
 629             }
 630             else
 631             {
 632                if (Server->IsOpen() == false)
 633                {
 634                   FailCounter++;
 635                   _error->Discard();
 636                   Server->Close();
 637
 638                   if (FailCounter >= 2)
 639                   {
 640                      Fail(_("Connection failed"),true);
 641                      FailCounter = 0;
 642                   }
 643
 644                   QueueBack = Queue;
 645                }
 646                else
 647                {
 648                   Server->Close();
 649                   Fail(true);
 650                }
 651             }
 652             break;
 653          }
 654
 655          // IMS hit
 656          case IMS_HIT:
 657          {
 658             URIDone(Res);
 659             break;
 660          }
 661
 662          // Hard server error, not found or something
 663          case ERROR_UNRECOVERABLE:
 664          {
 665             Fail();
 666             break;
 667          }
 668
 669          // Hard internal error, kill the connection and fail
 670          case ERROR_NOT_FROM_SERVER:
 671          {
 672             delete File;
 673             File = 0;
 674
 675             Fail();
 676             RotateDNS();
 677             Server->Close();
 678             break;
 679          }
 680
 681          // We need to flush the data, the header is like a 404 w/ error text
 682          case ERROR_WITH_CONTENT_PAGE:
 683          {
 684             Fail();
 685
 686             // Send to content to dev/null
 687             File = new FileFd("/dev/null",FileFd::WriteExists);
 688             Server->RunData(File);
 689             delete File;
 690             File = 0;
 691             break;
 692          }
 693
 694          // Try again with a new URL
 695          case TRY_AGAIN_OR_REDIRECT:
 696          {
 697             // Clear rest of response if there is content
 698             if (Server->HaveContent)
 699             {
 700                File = new FileFd("/dev/null",FileFd::WriteExists);
 701                Server->RunData(File);
 702                delete File;
 703                File = 0;
 704             }
 705
 706             /* Detect redirect loops.  No more redirects are allowed
 707                after the same URI is seen twice in a queue item. */
 708             StringVector &R = Redirected[Queue->DestFile];
 709             bool StopRedirects = false;
 710             if (R.empty() == true)
 711                R.push_back(Queue->Uri);
 712             else if (R[0] == "STOP" || R.size() > 10)
 713                StopRedirects = true;
 714             else
 715             {
 716                for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
 717                   if (Queue->Uri == *I)
 718                   {
 719                      R[0] = "STOP";
 720                      break;
 721                   }
 722
 723                R.push_back(Queue->Uri);
 724             }
 725
 726             if (StopRedirects == false)
 727                Redirect(NextURI);
 728             else
 729                Fail();
 730
 731             break;
 732          }
 733
 734          default:
 735          Fail(_("Internal error"));
 736          break;
 737       }
 738
 739       FailCounter = 0;
 740    }
 741
 742    return 0;
 743 }
 744                                                                         /*}}}*/
 745 unsigned long long ServerMethod::FindMaximumObjectSizeInQueue() const   /*{{{*/
 746 {
 747    unsigned long long MaxSizeInQueue = 0;
 748    for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
 749       MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
 750    return MaxSizeInQueue;
 751 }
 752                                                                         /*}}}*/
 753 ServerMethod::ServerMethod(char const * const Binary, char const * const Ver,unsigned long const Flags) :/*{{{*/
 754    aptMethod(Binary, Ver, Flags), Server(nullptr), File(NULL), PipelineDepth(10),
 755    AllowRedirect(false), Debug(false)
 756 {
 757 }
 758                                                                         /*}}}*/