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(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             Persistent = false;
 154          else
 155             Persistent = true;
 156       }
 157
 158       return true;
 159    }
 160
 161    if (stringcasecmp(Tag,"Content-Length:") == 0)
 162    {
 163       if (Encoding == Closes)
 164          Encoding = Stream;
 165       HaveContent = true;
 166
 167       unsigned long long * DownloadSizePtr = &DownloadSize;
 168       if (Result == 416)
 169          DownloadSizePtr = &JunkSize;
 170
 171       *DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
 172       if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
 173          return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
 174       else if (*DownloadSizePtr == 0)
 175          HaveContent = false;
 176
 177       // On partial content (206) the Content-Length less than the real
 178       // size, so do not set it here but leave that to the Content-Range
 179       // header instead
 180       if(Result != 206 && TotalFileSize == 0)
 181          TotalFileSize = DownloadSize;
 182
 183       return true;
 184    }
 185
 186    if (stringcasecmp(Tag,"Content-Type:") == 0)
 187    {
 188       HaveContent = true;
 189       return true;
 190    }
 191
 192    if (stringcasecmp(Tag,"Content-Range:") == 0)
 193    {
 194       HaveContent = true;
 195
 196       // §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
 197       if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&TotalFileSize) == 1)
 198          ; // we got the expected filesize which is all we wanted
 199       else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
 200          return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
 201       if ((unsigned long long)StartPos > TotalFileSize)
 202          return _error->Error(_("This HTTP server has broken range support"));
 203
 204       // figure out what we will download
 205       DownloadSize = TotalFileSize - StartPos;
 206       return true;
 207    }
 208
 209    if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
 210    {
 211       HaveContent = true;
 212       if (stringcasecmp(Val,"chunked") == 0)
 213          Encoding = Chunked;
 214       return true;
 215    }
 216
 217    if (stringcasecmp(Tag,"Connection:") == 0)
 218    {
 219       if (stringcasecmp(Val,"close") == 0)
 220          Persistent = false;
 221       if (stringcasecmp(Val,"keep-alive") == 0)
 222          Persistent = true;
 223       return true;
 224    }
 225
 226    if (stringcasecmp(Tag,"Last-Modified:") == 0)
 227    {
 228       if (RFC1123StrToTime(Val.c_str(), Date) == false)
 229          return _error->Error(_("Unknown date format"));
 230       return true;
 231    }
 232
 233    if (stringcasecmp(Tag,"Location:") == 0)
 234    {
 235       Location = Val;
 236       return true;
 237    }
 238
 239    return true;
 240 }
 241                                                                         /*}}}*/
 242 // ServerState::ServerState - Constructor                               /*{{{*/
 243 ServerState::ServerState(URI Srv, ServerMethod *Owner) : ServerName(Srv), TimeOut(120), Owner(Owner)
 244 {
 245    Reset();
 246 }
 247                                                                         /*}}}*/
 248 bool ServerState::AddPartialFileToHashes(FileFd &File)                  /*{{{*/
 249 {
 250    File.Truncate(StartPos);
 251    return GetHashes()->AddFD(File, StartPos);
 252 }
 253                                                                         /*}}}*/
 254
 255 bool ServerMethod::Configuration(string Message)                        /*{{{*/
 256 {
 257    if (pkgAcqMethod::Configuration(Message) == false)
 258       return false;
 259
 260    DropPrivsOrDie();
 261
 262    return true;
 263 }
 264                                                                         /*}}}*/
 265
 266 // ServerMethod::DealWithHeaders - Handle the retrieved header data     /*{{{*/
 267 // ---------------------------------------------------------------------
 268 /* We look at the header data we got back from the server and decide what
 269    to do. Returns DealWithHeadersResult (see http.h for details).
 270  */
 271 ServerMethod::DealWithHeadersResult
 272 ServerMethod::DealWithHeaders(FetchResult &Res)
 273 {
 274    // Not Modified
 275    if (Server->Result == 304)
 276    {
 277       unlink(Queue->DestFile.c_str());
 278       Res.IMSHit = true;
 279       Res.LastModified = Queue->LastModified;
 280       return IMS_HIT;
 281    }
 282
 283    /* Redirect
 284     *
 285     * Note that it is only OK for us to treat all redirection the same
 286     * because we *always* use GET, not other HTTP methods.  There are
 287     * three redirection codes for which it is not appropriate that we
 288     * redirect.  Pass on those codes so the error handling kicks in.
 289     */
 290    if (AllowRedirect
 291        && (Server->Result > 300 && Server->Result < 400)
 292        && (Server->Result != 300       // Multiple Choices
 293            && Server->Result != 304    // Not Modified
 294            && Server->Result != 306))  // (Not part of HTTP/1.1, reserved)
 295    {
 296       if (Server->Location.empty() == true);
 297       else if (Server->Location[0] == '/' && Queue->Uri.empty() == false)
 298       {
 299          URI Uri = Queue->Uri;
 300          if (Uri.Host.empty() == false)
 301             NextURI = URI::SiteOnly(Uri);
 302          else
 303             NextURI.clear();
 304          NextURI.append(DeQuoteString(Server->Location));
 305          return TRY_AGAIN_OR_REDIRECT;
 306       }
 307       else
 308       {
 309          NextURI = DeQuoteString(Server->Location);
 310          URI tmpURI = NextURI;
 311          URI Uri = Queue->Uri;
 312          // same protocol redirects are okay
 313          if (tmpURI.Access == Uri.Access)
 314             return TRY_AGAIN_OR_REDIRECT;
 315          // as well as http to https
 316          else if (Uri.Access == "http" && tmpURI.Access == "https")
 317             return TRY_AGAIN_OR_REDIRECT;
 318       }
 319       /* else pass through for error message */
 320    }
 321    // retry after an invalid range response without partial data
 322    else if (Server->Result == 416)
 323    {
 324       struct stat SBuf;
 325       if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 326       {
 327          bool partialHit = false;
 328          if (Queue->ExpectedHashes.usable() == true)
 329          {
 330             Hashes resultHashes(Queue->ExpectedHashes);
 331             FileFd file(Queue->DestFile, FileFd::ReadOnly);
 332             Server->TotalFileSize = file.FileSize();
 333             Server->Date = file.ModificationTime();
 334             resultHashes.AddFD(file);
 335             HashStringList const hashList = resultHashes.GetHashStringList();
 336             partialHit = (Queue->ExpectedHashes == hashList);
 337          }
 338          else if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
 339             partialHit = true;
 340          if (partialHit == true)
 341          {
 342             // the file is completely downloaded, but was not moved
 343             if (Server->HaveContent == true)
 344             {
 345                // Send to error page to dev/null
 346                FileFd DevNull("/dev/null",FileFd::WriteExists);
 347                Server->RunData(&DevNull);
 348             }
 349             Server->HaveContent = false;
 350             Server->StartPos = Server->TotalFileSize;
 351             Server->Result = 200;
 352          }
 353          else if (unlink(Queue->DestFile.c_str()) == 0)
 354          {
 355             NextURI = Queue->Uri;
 356             return TRY_AGAIN_OR_REDIRECT;
 357          }
 358       }
 359    }
 360
 361    /* We have a reply we don't handle. This should indicate a perm server
 362       failure */
 363    if (Server->Result < 200 || Server->Result >= 300)
 364    {
 365       std::string err;
 366       strprintf(err, "HttpError%u", Server->Result);
 367       SetFailReason(err);
 368       _error->Error("%u %s", Server->Result, Server->Code);
 369       if (Server->HaveContent == true)
 370          return ERROR_WITH_CONTENT_PAGE;
 371       return ERROR_UNRECOVERABLE;
 372    }
 373
 374    // This is some sort of 2xx 'data follows' reply
 375    Res.LastModified = Server->Date;
 376    Res.Size = Server->TotalFileSize;
 377
 378    // Open the file
 379    delete File;
 380    File = new FileFd(Queue->DestFile,FileFd::WriteAny);
 381    if (_error->PendingError() == true)
 382       return ERROR_NOT_FROM_SERVER;
 383
 384    FailFile = Queue->DestFile;
 385    FailFile.c_str();   // Make sure we don't do a malloc in the signal handler
 386    FailFd = File->Fd();
 387    FailTime = Server->Date;
 388
 389    if (Server->InitHashes(Queue->ExpectedHashes) == false || Server->AddPartialFileToHashes(*File) == false)
 390    {
 391       _error->Errno("read",_("Problem hashing file"));
 392       return ERROR_NOT_FROM_SERVER;
 393    }
 394    if (Server->StartPos > 0)
 395       Res.ResumePoint = Server->StartPos;
 396
 397    SetNonBlock(File->Fd(),true);
 398    return FILE_IS_OPEN;
 399 }
 400                                                                         /*}}}*/
 401 // ServerMethod::SigTerm - Handle a fatal signal                        /*{{{*/
 402 // ---------------------------------------------------------------------
 403 /* This closes and timestamps the open file. This is necessary to get
 404    resume behavoir on user abort */
 405 void ServerMethod::SigTerm(int)
 406 {
 407    if (FailFd == -1)
 408       _exit(100);
 409
 410    struct timeval times[2];
 411    times[0].tv_sec = FailTime;
 412    times[1].tv_sec = FailTime;
 413    times[0].tv_usec = times[1].tv_usec = 0;
 414    utimes(FailFile.c_str(), times);
 415    close(FailFd);
 416
 417    _exit(100);
 418 }
 419                                                                         /*}}}*/
 420 // ServerMethod::Fetch - Fetch an item                                  /*{{{*/
 421 // ---------------------------------------------------------------------
 422 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 423    depth. */
 424 bool ServerMethod::Fetch(FetchItem *)
 425 {
 426    if (Server == 0)
 427       return true;
 428
 429    // Queue the requests
 430    int Depth = -1;
 431    for (FetchItem *I = Queue; I != 0 && Depth < (signed)PipelineDepth;
 432         I = I->Next, Depth++)
 433    {
 434       if (Depth >= 0)
 435       {
 436          // If pipelining is disabled, we only queue 1 request
 437          if (Server->Pipeline == false)
 438             break;
 439          // if we have no hashes, do at most one such request
 440          // as we can't fixup pipeling misbehaviors otherwise
 441          else if (I->ExpectedHashes.usable() == false)
 442             break;
 443       }
 444
 445       // Make sure we stick with the same server
 446       if (Server->Comp(I->Uri) == false)
 447          break;
 448       if (QueueBack == I)
 449       {
 450          QueueBack = I->Next;
 451          SendReq(I);
 452          continue;
 453       }
 454    }
 455
 456    return true;
 457 }
 458                                                                         /*}}}*/
 459 // ServerMethod::Loop - Main loop                                       /*{{{*/
 460 int ServerMethod::Loop()
 461 {
 462    typedef vector<string> StringVector;
 463    typedef vector<string>::iterator StringVectorIterator;
 464    map<string, StringVector> Redirected;
 465
 466    signal(SIGTERM,SigTerm);
 467    signal(SIGINT,SigTerm);
 468
 469    Server = 0;
 470
 471    int FailCounter = 0;
 472    while (1)
 473    {
 474       // We have no commands, wait for some to arrive
 475       if (Queue == 0)
 476       {
 477          if (WaitFd(STDIN_FILENO) == false)
 478             return 0;
 479       }
 480
 481       /* Run messages, we can accept 0 (no message) if we didn't
 482          do a WaitFd above.. Otherwise the FD is closed. */
 483       int Result = Run(true);
 484       if (Result != -1 && (Result != 0 || Queue == 0))
 485       {
 486          if(FailReason.empty() == false ||
 487             _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 488             return 100;
 489          else
 490             return 0;
 491       }
 492
 493       if (Queue == 0)
 494          continue;
 495
 496       // Connect to the server
 497       if (Server == 0 || Server->Comp(Queue->Uri) == false)
 498          Server = CreateServerState(Queue->Uri);
 499
 500       /* If the server has explicitly said this is the last connection
 501          then we pre-emptively shut down the pipeline and tear down
 502          the connection. This will speed up HTTP/1.0 servers a tad
 503          since we don't have to wait for the close sequence to
 504          complete */
 505       if (Server->Persistent == false)
 506          Server->Close();
 507
 508       // Reset the pipeline
 509       if (Server->IsOpen() == false)
 510          QueueBack = Queue;
 511
 512       // Connnect to the host
 513       if (Server->Open() == false)
 514       {
 515          Fail(true);
 516          Server = nullptr;
 517          continue;
 518       }
 519
 520       // Fill the pipeline.
 521       Fetch(0);
 522
 523       // Fetch the next URL header data from the server.
 524       switch (Server->RunHeaders(File, Queue->Uri))
 525       {
 526          case ServerState::RUN_HEADERS_OK:
 527          break;
 528
 529          // The header data is bad
 530          case ServerState::RUN_HEADERS_PARSE_ERROR:
 531          {
 532             _error->Error(_("Bad header data"));
 533             Fail(true);
 534             RotateDNS();
 535             continue;
 536          }
 537
 538          // The server closed a connection during the header get..
 539          default:
 540          case ServerState::RUN_HEADERS_IO_ERROR:
 541          {
 542             FailCounter++;
 543             _error->Discard();
 544             Server->Close();
 545             Server->Pipeline = false;
 546
 547             if (FailCounter >= 2)
 548             {
 549                Fail(_("Connection failed"),true);
 550                FailCounter = 0;
 551             }
 552
 553             RotateDNS();
 554             continue;
 555          }
 556       };
 557
 558       // Decide what to do.
 559       FetchResult Res;
 560       Res.Filename = Queue->DestFile;
 561       switch (DealWithHeaders(Res))
 562       {
 563          // Ok, the file is Open
 564          case FILE_IS_OPEN:
 565          {
 566             URIStart(Res);
 567
 568             // Run the data
 569             bool Result = true;
 570
 571             // ensure we don't fetch too much
 572             // we could do "Server->MaximumSize = Queue->MaximumSize" here
 573             // but that would break the clever pipeline messup detection
 574             // so instead we use the size of the biggest item in the queue
 575             Server->MaximumSize = FindMaximumObjectSizeInQueue();
 576
 577             if (Server->HaveContent)
 578                Result = Server->RunData(File);
 579
 580             /* If the server is sending back sizeless responses then fill in
 581                the size now */
 582             if (Res.Size == 0)
 583                Res.Size = File->Size();
 584
 585             // Close the file, destroy the FD object and timestamp it
 586             FailFd = -1;
 587             delete File;
 588             File = 0;
 589
 590             // Timestamp
 591             struct timeval times[2];
 592             times[0].tv_sec = times[1].tv_sec = Server->Date;
 593             times[0].tv_usec = times[1].tv_usec = 0;
 594             utimes(Queue->DestFile.c_str(), times);
 595
 596             // Send status to APT
 597             if (Result == true)
 598             {
 599                Hashes * const resultHashes = Server->GetHashes();
 600                HashStringList const hashList = resultHashes->GetHashStringList();
 601                if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
 602                {
 603                   // we did not get the expected hash… mhhh:
 604                   // could it be that server/proxy messed up pipelining?
 605                   FetchItem * BeforeI = Queue;
 606                   for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
 607                   {
 608                      if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
 609                      {
 610                         // yes, he did! Disable pipelining and rewrite queue
 611                         if (Server->Pipeline == true)
 612                         {
 613                            // FIXME: fake a warning message as we have no proper way of communicating here
 614                            std::string out;
 615                            strprintf(out, _("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::PipelineDepth");
 616                            std::cerr << "W: " << out << std::endl;
 617                            Server->Pipeline = false;
 618                            // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
 619                         }
 620                         Rename(Res.Filename, I->DestFile);
 621                         Res.Filename = I->DestFile;
 622                         BeforeI->Next = I->Next;
 623                         I->Next = Queue;
 624                         Queue = I;
 625                         break;
 626                      }
 627                      BeforeI = I;
 628                   }
 629                }
 630                Res.TakeHashes(*resultHashes);
 631                URIDone(Res);
 632             }
 633             else
 634             {
 635                if (Server->IsOpen() == false)
 636                {
 637                   FailCounter++;
 638                   _error->Discard();
 639                   Server->Close();
 640
 641                   if (FailCounter >= 2)
 642                   {
 643                      Fail(_("Connection failed"),true);
 644                      FailCounter = 0;
 645                   }
 646
 647                   QueueBack = Queue;
 648                }
 649                else
 650                {
 651                   Server->Close();
 652                   Fail(true);
 653                }
 654             }
 655             break;
 656          }
 657
 658          // IMS hit
 659          case IMS_HIT:
 660          {
 661             URIDone(Res);
 662             break;
 663          }
 664
 665          // Hard server error, not found or something
 666          case ERROR_UNRECOVERABLE:
 667          {
 668             Fail();
 669             break;
 670          }
 671
 672          // Hard internal error, kill the connection and fail
 673          case ERROR_NOT_FROM_SERVER:
 674          {
 675             delete File;
 676             File = 0;
 677
 678             Fail();
 679             RotateDNS();
 680             Server->Close();
 681             break;
 682          }
 683
 684          // We need to flush the data, the header is like a 404 w/ error text
 685          case ERROR_WITH_CONTENT_PAGE:
 686          {
 687             Fail();
 688
 689             // Send to content to dev/null
 690             File = new FileFd("/dev/null",FileFd::WriteExists);
 691             Server->RunData(File);
 692             delete File;
 693             File = 0;
 694             break;
 695          }
 696
 697          // Try again with a new URL
 698          case TRY_AGAIN_OR_REDIRECT:
 699          {
 700             // Clear rest of response if there is content
 701             if (Server->HaveContent)
 702             {
 703                File = new FileFd("/dev/null",FileFd::WriteExists);
 704                Server->RunData(File);
 705                delete File;
 706                File = 0;
 707             }
 708
 709             /* Detect redirect loops.  No more redirects are allowed
 710                after the same URI is seen twice in a queue item. */
 711             StringVector &R = Redirected[Queue->DestFile];
 712             bool StopRedirects = false;
 713             if (R.empty() == true)
 714                R.push_back(Queue->Uri);
 715             else if (R[0] == "STOP" || R.size() > 10)
 716                StopRedirects = true;
 717             else
 718             {
 719                for (StringVectorIterator I = R.begin(); I != R.end(); ++I)
 720                   if (Queue->Uri == *I)
 721                   {
 722                      R[0] = "STOP";
 723                      break;
 724                   }
 725
 726                R.push_back(Queue->Uri);
 727             }
 728
 729             if (StopRedirects == false)
 730                Redirect(NextURI);
 731             else
 732                Fail();
 733
 734             break;
 735          }
 736
 737          default:
 738          Fail(_("Internal error"));
 739          break;
 740       }
 741
 742       FailCounter = 0;
 743    }
 744
 745    return 0;
 746 }
 747                                                                         /*}}}*/
 748 unsigned long long ServerMethod::FindMaximumObjectSizeInQueue() const   /*{{{*/
 749 {
 750    unsigned long long MaxSizeInQueue = 0;
 751    for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
 752       MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
 753    return MaxSizeInQueue;
 754 }
 755                                                                         /*}}}*/
 756 ServerMethod::ServerMethod(const char *Ver,unsigned long Flags) :       /*{{{*/
 757    pkgAcqMethod(Ver, Flags), Server(nullptr), File(NULL), PipelineDepth(10),
 758    AllowRedirect(false), Debug(false)
 759 {
 760 }
 761                                                                         /*}}}*/