methods/server.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 /* ######################################################################
   4
   5    HTTP and HTTPS share a lot of common code and these classes are
   6    exactly the dumping ground for this common code
   7
   8    ##################################################################### */
   9                                                                         /*}}}*/
  10 // Include Files                                                        /*{{{*/
  11 #include <config.h>
  12
  13 #include <apt-pkg/configuration.h>
  14 #include <apt-pkg/error.h>
  15 #include <apt-pkg/fileutl.h>
  16 #include <apt-pkg/strutl.h>
  17
  18 #include <ctype.h>
  19 #include <signal.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/stat.h>
  23 #include <sys/time.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <iostream>
  27 #include <limits>
  28 #include <map>
  29 #include <string>
  30 #include <vector>
  31
  32 #include "server.h"
  33
  34 #include <apti18n.h>
  35                                                                         /*}}}*/
  36 using namespace std;
  37
  38 string ServerMethod::FailFile;
  39 int ServerMethod::FailFd = -1;
  40 time_t ServerMethod::FailTime = 0;
  41
  42 // ServerState::RunHeaders - Get the headers before the data            /*{{{*/
  43 // ---------------------------------------------------------------------
  44 /* Returns 0 if things are OK, 1 if an IO error occurred and 2 if a header
  45    parse error occurred */
  46 ServerState::RunHeadersResult ServerState::RunHeaders(FileFd * const File,
  47                                                       const std::string &Uri)
  48 {
  49    State = Header;
  50
  51    Owner->Status(_("Waiting for headers"));
  52
  53    Major = 0;
  54    Minor = 0;
  55    Result = 0;
  56    TotalFileSize = 0;
  57    JunkSize = 0;
  58    StartPos = 0;
  59    Encoding = Closes;
  60    HaveContent = false;
  61    time(&Date);
  62
  63    do
  64    {
  65       string Data;
  66       if (ReadHeaderLines(Data) == false)
  67          continue;
  68
  69       if (Owner->Debug == true)
  70          clog << "Answer for: " << Uri << endl << Data;
  71
  72       for (string::const_iterator I = Data.begin(); I < Data.end(); ++I)
  73       {
  74          string::const_iterator J = I;
  75          for (; J != Data.end() && *J != '\n' && *J != '\r'; ++J);
  76          if (HeaderLine(string(I,J)) == false)
  77             return RUN_HEADERS_PARSE_ERROR;
  78          I = J;
  79       }
  80
  81       // 100 Continue is a Nop...
  82       if (Result == 100)
  83          continue;
  84
  85       // Tidy up the connection persistence state.
  86       if (Encoding == Closes && HaveContent == true)
  87          Persistent = false;
  88
  89       return RUN_HEADERS_OK;
  90    }
  91    while (LoadNextResponse(false, File) == true);
  92
  93    return RUN_HEADERS_IO_ERROR;
  94 }
  95                                                                         /*}}}*/
  96 // ServerState::HeaderLine - Process a header line                      /*{{{*/
  97 // ---------------------------------------------------------------------
  98 /* */
  99 bool ServerState::HeaderLine(string Line)
 100 {
 101    if (Line.empty() == true)
 102       return true;
 103
 104    string::size_type Pos = Line.find(' ');
 105    if (Pos == string::npos || Pos+1 > Line.length())
 106    {
 107       // Blah, some servers use "connection:closes", evil.
 108       Pos = Line.find(':');
 109       if (Pos == string::npos || Pos + 2 > Line.length())
 110          return _error->Error(_("Bad header line"));
 111       Pos++;
 112    }
 113
 114    // Parse off any trailing spaces between the : and the next word.
 115    string::size_type Pos2 = Pos;
 116    while (Pos2 < Line.length() && isspace_ascii(Line[Pos2]) != 0)
 117       Pos2++;
 118
 119    string Tag = string(Line,0,Pos);
 120    string Val = string(Line,Pos2);
 121
 122    if (stringcasecmp(Tag.c_str(),Tag.c_str()+4,"HTTP") == 0)
 123    {
 124       // Evil servers return no version
 125       if (Line[4] == '/')
 126       {
 127          int const elements = sscanf(Line.c_str(),"HTTP/%3u.%3u %3u%359[^\n]",&Major,&Minor,&Result,Code);
 128          if (elements == 3)
 129          {
 130             Code[0] = '\0';
 131             if (Owner != NULL && Owner->Debug == true)
 132                clog << "HTTP server doesn't give Reason-Phrase for " << std::to_string(Result) << std::endl;
 133          }
 134          else if (elements != 4)
 135             return _error->Error(_("The HTTP server sent an invalid reply header"));
 136       }
 137       else
 138       {
 139          Major = 0;
 140          Minor = 9;
 141          if (sscanf(Line.c_str(),"HTTP %3u%359[^\n]",&Result,Code) != 2)
 142             return _error->Error(_("The HTTP server sent an invalid reply header"));
 143       }
 144
 145       /* Check the HTTP response header to get the default persistence
 146          state. */
 147       if (Major < 1)
 148          Persistent = false;
 149       else
 150       {
 151          if (Major == 1 && Minor == 0)
 152          {
 153             Persistent = false;
 154          }
 155          else
 156          {
 157             Persistent = true;
 158             if (PipelineAllowed)
 159                Pipeline = true;
 160          }
 161       }
 162
 163       return true;
 164    }
 165
 166    if (stringcasecmp(Tag,"Content-Length:") == 0)
 167    {
 168       if (Encoding == Closes)
 169          Encoding = Stream;
 170       HaveContent = true;
 171
 172       unsigned long long * DownloadSizePtr = &DownloadSize;
 173       if (Result == 416)
 174          DownloadSizePtr = &JunkSize;
 175
 176       *DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
 177       if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
 178          return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
 179       else if (*DownloadSizePtr == 0)
 180          HaveContent = false;
 181
 182       // On partial content (206) the Content-Length less than the real
 183       // size, so do not set it here but leave that to the Content-Range
 184       // header instead
 185       if(Result != 206 && TotalFileSize == 0)
 186          TotalFileSize = DownloadSize;
 187
 188       return true;
 189    }
 190
 191    if (stringcasecmp(Tag,"Content-Type:") == 0)
 192    {
 193       HaveContent = true;
 194       return true;
 195    }
 196
 197    if (stringcasecmp(Tag,"Content-Range:") == 0)
 198    {
 199       HaveContent = true;
 200
 201       // §14.16 says 'byte-range-resp-spec' should be a '*' in case of 416
 202       if (Result == 416 && sscanf(Val.c_str(), "bytes */%llu",&TotalFileSize) == 1)
 203          ; // we got the expected filesize which is all we wanted
 204       else if (sscanf(Val.c_str(),"bytes %llu-%*u/%llu",&StartPos,&TotalFileSize) != 2)
 205          return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
 206       if ((unsigned long long)StartPos > TotalFileSize)
 207          return _error->Error(_("This HTTP server has broken range support"));
 208
 209       // figure out what we will download
 210       DownloadSize = TotalFileSize - StartPos;
 211       return true;
 212    }
 213
 214    if (stringcasecmp(Tag,"Transfer-Encoding:") == 0)
 215    {
 216       HaveContent = true;
 217       if (stringcasecmp(Val,"chunked") == 0)
 218          Encoding = Chunked;
 219       return true;
 220    }
 221
 222    if (stringcasecmp(Tag,"Connection:") == 0)
 223    {
 224       if (stringcasecmp(Val,"close") == 0)
 225          Persistent = false;
 226       if (stringcasecmp(Val,"keep-alive") == 0)
 227          Persistent = true;
 228       return true;
 229    }
 230
 231    if (stringcasecmp(Tag,"Last-Modified:") == 0)
 232    {
 233       if (RFC1123StrToTime(Val.c_str(), Date) == false)
 234          return _error->Error(_("Unknown date format"));
 235       return true;
 236    }
 237
 238    if (stringcasecmp(Tag,"Location:") == 0)
 239    {
 240       Location = Val;
 241       return true;
 242    }
 243
 244    return true;
 245 }
 246                                                                         /*}}}*/
 247 // ServerState::ServerState - Constructor                               /*{{{*/
 248 ServerState::ServerState(URI Srv, ServerMethod *Owner) :
 249    DownloadSize(0), ServerName(Srv), TimeOut(120), Owner(Owner)
 250 {
 251    Reset();
 252 }
 253                                                                         /*}}}*/
 254 bool ServerState::AddPartialFileToHashes(FileFd &File)                  /*{{{*/
 255 {
 256    File.Truncate(StartPos);
 257    return GetHashes()->AddFD(File, StartPos);
 258 }
 259                                                                         /*}}}*/
 260
 261 // ServerMethod::DealWithHeaders - Handle the retrieved header data     /*{{{*/
 262 // ---------------------------------------------------------------------
 263 /* We look at the header data we got back from the server and decide what
 264    to do. Returns DealWithHeadersResult (see http.h for details).
 265  */
 266 ServerMethod::DealWithHeadersResult
 267 ServerMethod::DealWithHeaders(FetchResult &Res)
 268 {
 269    // Not Modified
 270    if (Server->Result == 304)
 271    {
 272       RemoveFile("server", Queue->DestFile);
 273       Res.IMSHit = true;
 274       Res.LastModified = Queue->LastModified;
 275       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          if (Queue->Uri == NextURI)
 301          {
 302             SetFailReason("RedirectionLoop");
 303             _error->Error("Redirection loop encountered");
 304             if (Server->HaveContent == true)
 305                return ERROR_WITH_CONTENT_PAGE;
 306             return ERROR_UNRECOVERABLE;
 307          }
 308          return TRY_AGAIN_OR_REDIRECT;
 309       }
 310       else
 311       {
 312          NextURI = DeQuoteString(Server->Location);
 313          URI tmpURI = NextURI;
 314          if (tmpURI.Access == "http" && Binary == "https+http")
 315          {
 316             tmpURI.Access = "https+http";
 317             NextURI = tmpURI;
 318          }
 319          if (Queue->Uri == NextURI)
 320          {
 321             SetFailReason("RedirectionLoop");
 322             _error->Error("Redirection loop encountered");
 323             if (Server->HaveContent == true)
 324                return ERROR_WITH_CONTENT_PAGE;
 325             return ERROR_UNRECOVERABLE;
 326          }
 327          URI Uri = Queue->Uri;
 328          // same protocol redirects are okay
 329          if (tmpURI.Access == Uri.Access)
 330             return TRY_AGAIN_OR_REDIRECT;
 331          // as well as http to https
 332          else if (Uri.Access == "http" && tmpURI.Access == "https")
 333             return TRY_AGAIN_OR_REDIRECT;
 334       }
 335       /* else pass through for error message */
 336    }
 337    // retry after an invalid range response without partial data
 338    else if (Server->Result == 416)
 339    {
 340       struct stat SBuf;
 341       if (stat(Queue->DestFile.c_str(),&SBuf) >= 0 && SBuf.st_size > 0)
 342       {
 343          bool partialHit = false;
 344          if (Queue->ExpectedHashes.usable() == true)
 345          {
 346             Hashes resultHashes(Queue->ExpectedHashes);
 347             FileFd file(Queue->DestFile, FileFd::ReadOnly);
 348             Server->TotalFileSize = file.FileSize();
 349             Server->Date = file.ModificationTime();
 350             resultHashes.AddFD(file);
 351             HashStringList const hashList = resultHashes.GetHashStringList();
 352             partialHit = (Queue->ExpectedHashes == hashList);
 353          }
 354          else if ((unsigned long long)SBuf.st_size == Server->TotalFileSize)
 355             partialHit = true;
 356          if (partialHit == true)
 357          {
 358             // the file is completely downloaded, but was not moved
 359             if (Server->HaveContent == true)
 360             {
 361                // Send to error page to dev/null
 362                FileFd DevNull("/dev/null",FileFd::WriteExists);
 363                Server->RunData(&DevNull);
 364             }
 365             Server->HaveContent = false;
 366             Server->StartPos = Server->TotalFileSize;
 367             Server->Result = 200;
 368          }
 369          else if (RemoveFile("server", Queue->DestFile))
 370          {
 371             NextURI = Queue->Uri;
 372             return TRY_AGAIN_OR_REDIRECT;
 373          }
 374       }
 375    }
 376
 377    /* We have a reply we don't handle. This should indicate a perm server
 378       failure */
 379    if (Server->Result < 200 || Server->Result >= 300)
 380    {
 381       std::string err;
 382       strprintf(err, "HttpError%u", Server->Result);
 383       SetFailReason(err);
 384       _error->Error("%u %s", Server->Result, Server->Code);
 385       if (Server->HaveContent == true)
 386          return ERROR_WITH_CONTENT_PAGE;
 387       return ERROR_UNRECOVERABLE;
 388    }
 389
 390    // This is some sort of 2xx 'data follows' reply
 391    Res.LastModified = Server->Date;
 392    Res.Size = Server->TotalFileSize;
 393
 394    // Open the file
 395    delete File;
 396    File = new FileFd(Queue->DestFile,FileFd::WriteAny);
 397    if (_error->PendingError() == true)
 398       return ERROR_NOT_FROM_SERVER;
 399
 400    FailFile = Queue->DestFile;
 401    FailFile.c_str();   // Make sure we don't do a malloc in the signal handler
 402    FailFd = File->Fd();
 403    FailTime = Server->Date;
 404
 405    if (Server->InitHashes(Queue->ExpectedHashes) == false || Server->AddPartialFileToHashes(*File) == false)
 406    {
 407       _error->Errno("read",_("Problem hashing file"));
 408       return ERROR_NOT_FROM_SERVER;
 409    }
 410    if (Server->StartPos > 0)
 411       Res.ResumePoint = Server->StartPos;
 412
 413    SetNonBlock(File->Fd(),true);
 414    return FILE_IS_OPEN;
 415 }
 416                                                                         /*}}}*/
 417 // ServerMethod::SigTerm - Handle a fatal signal                        /*{{{*/
 418 // ---------------------------------------------------------------------
 419 /* This closes and timestamps the open file. This is necessary to get
 420    resume behavoir on user abort */
 421 void ServerMethod::SigTerm(int)
 422 {
 423    if (FailFd == -1)
 424       _exit(100);
 425
 426    struct timeval times[2];
 427    times[0].tv_sec = FailTime;
 428    times[1].tv_sec = FailTime;
 429    times[0].tv_usec = times[1].tv_usec = 0;
 430    utimes(FailFile.c_str(), times);
 431    close(FailFd);
 432
 433    _exit(100);
 434 }
 435                                                                         /*}}}*/
 436 // ServerMethod::Fetch - Fetch an item                                  /*{{{*/
 437 // ---------------------------------------------------------------------
 438 /* This adds an item to the pipeline. We keep the pipeline at a fixed
 439    depth. */
 440 bool ServerMethod::Fetch(FetchItem *)
 441 {
 442    if (Server == nullptr || QueueBack == nullptr)
 443       return true;
 444
 445    // If pipelining is disabled, we only queue 1 request
 446    auto const AllowedDepth = Server->Pipeline ? PipelineDepth : 0;
 447    // how deep is our pipeline currently?
 448    decltype(PipelineDepth) CurrentDepth = 0;
 449    for (FetchItem const *I = Queue; I != QueueBack; I = I->Next)
 450       ++CurrentDepth;
 451    if (CurrentDepth > AllowedDepth)
 452       return true;
 453
 454    do {
 455       // Make sure we stick with the same server
 456       if (Server->Comp(QueueBack->Uri) == false)
 457          break;
 458
 459       bool const UsableHashes = QueueBack->ExpectedHashes.usable();
 460       // if we have no hashes, do at most one such request
 461       // as we can't fixup pipeling misbehaviors otherwise
 462       if (CurrentDepth != 0 && UsableHashes == false)
 463          break;
 464
 465       if (UsableHashes && FileExists(QueueBack->DestFile))
 466       {
 467          FileFd partial(QueueBack->DestFile, FileFd::ReadOnly);
 468          Hashes wehave(QueueBack->ExpectedHashes);
 469          if (QueueBack->ExpectedHashes.FileSize() == partial.FileSize())
 470          {
 471             if (wehave.AddFD(partial) &&
 472                   wehave.GetHashStringList() == QueueBack->ExpectedHashes)
 473             {
 474                FetchResult Res;
 475                Res.Filename = QueueBack->DestFile;
 476                Res.ResumePoint = QueueBack->ExpectedHashes.FileSize();
 477                URIStart(Res);
 478                // move item to the start of the queue as URIDone will
 479                // always dequeued the first item in the queue
 480                if (Queue != QueueBack)
 481                {
 482                   FetchItem *Prev = Queue;
 483                   for (; Prev->Next != QueueBack; Prev = Prev->Next)
 484                      /* look for the previous queue item */;
 485                   Prev->Next = QueueBack->Next;
 486                   QueueBack->Next = Queue;
 487                   Queue = QueueBack;
 488                   QueueBack = Prev->Next;
 489                }
 490                Res.TakeHashes(wehave);
 491                URIDone(Res);
 492                continue;
 493             }
 494             else
 495                RemoveFile("Fetch-Partial", QueueBack->DestFile);
 496          }
 497       }
 498       auto const Tmp = QueueBack;
 499       QueueBack = QueueBack->Next;
 500       SendReq(Tmp);
 501       ++CurrentDepth;
 502    } while (CurrentDepth <= AllowedDepth && QueueBack != nullptr);
 503
 504    return true;
 505 }
 506                                                                         /*}}}*/
 507 // ServerMethod::Loop - Main loop                                       /*{{{*/
 508 int ServerMethod::Loop()
 509 {
 510    signal(SIGTERM,SigTerm);
 511    signal(SIGINT,SigTerm);
 512
 513    Server = 0;
 514
 515    int FailCounter = 0;
 516    while (1)
 517    {
 518       // We have no commands, wait for some to arrive
 519       if (Queue == 0)
 520       {
 521          if (WaitFd(STDIN_FILENO) == false)
 522             return 0;
 523       }
 524
 525       /* Run messages, we can accept 0 (no message) if we didn't
 526          do a WaitFd above.. Otherwise the FD is closed. */
 527       int Result = Run(true);
 528       if (Result != -1 && (Result != 0 || Queue == 0))
 529       {
 530          if(FailReason.empty() == false ||
 531             _config->FindB("Acquire::http::DependOnSTDIN", true) == true)
 532             return 100;
 533          else
 534             return 0;
 535       }
 536
 537       if (Queue == 0)
 538          continue;
 539
 540       // Connect to the server
 541       if (Server == 0 || Server->Comp(Queue->Uri) == false)
 542          Server = CreateServerState(Queue->Uri);
 543
 544       /* If the server has explicitly said this is the last connection
 545          then we pre-emptively shut down the pipeline and tear down
 546          the connection. This will speed up HTTP/1.0 servers a tad
 547          since we don't have to wait for the close sequence to
 548          complete */
 549       if (Server->Persistent == false)
 550          Server->Close();
 551
 552       // Reset the pipeline
 553       if (Server->IsOpen() == false)
 554          QueueBack = Queue;
 555
 556       // Connnect to the host
 557       if (Server->Open() == false)
 558       {
 559          Fail(true);
 560          Server = nullptr;
 561          continue;
 562       }
 563
 564       // Fill the pipeline.
 565       Fetch(0);
 566
 567       // Fetch the next URL header data from the server.
 568       switch (Server->RunHeaders(File, Queue->Uri))
 569       {
 570          case ServerState::RUN_HEADERS_OK:
 571          break;
 572
 573          // The header data is bad
 574          case ServerState::RUN_HEADERS_PARSE_ERROR:
 575          {
 576             _error->Error(_("Bad header data"));
 577             Fail(true);
 578             Server->Close();
 579             RotateDNS();
 580             continue;
 581          }
 582
 583          // The server closed a connection during the header get..
 584          default:
 585          case ServerState::RUN_HEADERS_IO_ERROR:
 586          {
 587             FailCounter++;
 588             _error->Discard();
 589             Server->Close();
 590             Server->Pipeline = false;
 591             Server->PipelineAllowed = false;
 592
 593             if (FailCounter >= 2)
 594             {
 595                Fail(_("Connection failed"),true);
 596                FailCounter = 0;
 597             }
 598
 599             RotateDNS();
 600             continue;
 601          }
 602       };
 603
 604       // Decide what to do.
 605       FetchResult Res;
 606       Res.Filename = Queue->DestFile;
 607       switch (DealWithHeaders(Res))
 608       {
 609          // Ok, the file is Open
 610          case FILE_IS_OPEN:
 611          {
 612             URIStart(Res);
 613
 614             // Run the data
 615             bool Result = true;
 616
 617             // ensure we don't fetch too much
 618             // we could do "Server->MaximumSize = Queue->MaximumSize" here
 619             // but that would break the clever pipeline messup detection
 620             // so instead we use the size of the biggest item in the queue
 621             Server->MaximumSize = FindMaximumObjectSizeInQueue();
 622
 623             if (Server->HaveContent)
 624                Result = Server->RunData(File);
 625
 626             /* If the server is sending back sizeless responses then fill in
 627                the size now */
 628             if (Res.Size == 0)
 629                Res.Size = File->Size();
 630
 631             // Close the file, destroy the FD object and timestamp it
 632             FailFd = -1;
 633             delete File;
 634             File = 0;
 635
 636             // Timestamp
 637             struct timeval times[2];
 638             times[0].tv_sec = times[1].tv_sec = Server->Date;
 639             times[0].tv_usec = times[1].tv_usec = 0;
 640             utimes(Queue->DestFile.c_str(), times);
 641
 642             // Send status to APT
 643             if (Result == true)
 644             {
 645                Hashes * const resultHashes = Server->GetHashes();
 646                HashStringList const hashList = resultHashes->GetHashStringList();
 647                if (PipelineDepth != 0 && Queue->ExpectedHashes.usable() == true && Queue->ExpectedHashes != hashList)
 648                {
 649                   // we did not get the expected hash… mhhh:
 650                   // could it be that server/proxy messed up pipelining?
 651                   FetchItem * BeforeI = Queue;
 652                   for (FetchItem *I = Queue->Next; I != 0 && I != QueueBack; I = I->Next)
 653                   {
 654                      if (I->ExpectedHashes.usable() == true && I->ExpectedHashes == hashList)
 655                      {
 656                         // yes, he did! Disable pipelining and rewrite queue
 657                         if (Server->Pipeline == true)
 658                         {
 659                            Warning(_("Automatically disabled %s due to incorrect response from server/proxy. (man 5 apt.conf)"), "Acquire::http::Pipeline-Depth");
 660                            Server->Pipeline = false;
 661                            Server->PipelineAllowed = false;
 662                            // we keep the PipelineDepth value so that the rest of the queue can be fixed up as well
 663                         }
 664                         Rename(Res.Filename, I->DestFile);
 665                         Res.Filename = I->DestFile;
 666                         BeforeI->Next = I->Next;
 667                         I->Next = Queue;
 668                         Queue = I;
 669                         break;
 670                      }
 671                      BeforeI = I;
 672                   }
 673                }
 674                Res.TakeHashes(*resultHashes);
 675                URIDone(Res);
 676             }
 677             else
 678             {
 679                if (Server->IsOpen() == false)
 680                {
 681                   FailCounter++;
 682                   _error->Discard();
 683                   Server->Close();
 684
 685                   if (FailCounter >= 2)
 686                   {
 687                      Fail(_("Connection failed"),true);
 688                      FailCounter = 0;
 689                   }
 690
 691                   QueueBack = Queue;
 692                }
 693                else
 694                {
 695                   Server->Close();
 696                   Fail(true);
 697                }
 698             }
 699             break;
 700          }
 701
 702          // IMS hit
 703          case IMS_HIT:
 704          {
 705             URIDone(Res);
 706             break;
 707          }
 708
 709          // Hard server error, not found or something
 710          case ERROR_UNRECOVERABLE:
 711          {
 712             Fail();
 713             break;
 714          }
 715
 716          // Hard internal error, kill the connection and fail
 717          case ERROR_NOT_FROM_SERVER:
 718          {
 719             delete File;
 720             File = 0;
 721
 722             Fail();
 723             RotateDNS();
 724             Server->Close();
 725             break;
 726          }
 727
 728          // We need to flush the data, the header is like a 404 w/ error text
 729          case ERROR_WITH_CONTENT_PAGE:
 730          {
 731             Fail();
 732
 733             // Send to content to dev/null
 734             File = new FileFd("/dev/null",FileFd::WriteExists);
 735             Server->RunData(File);
 736             delete File;
 737             File = 0;
 738             break;
 739          }
 740
 741          // Try again with a new URL
 742          case TRY_AGAIN_OR_REDIRECT:
 743          {
 744             // Clear rest of response if there is content
 745             if (Server->HaveContent)
 746                Server->RunDataToDevNull();
 747             Redirect(NextURI);
 748             break;
 749          }
 750
 751          default:
 752          Fail(_("Internal error"));
 753          break;
 754       }
 755
 756       FailCounter = 0;
 757    }
 758
 759    return 0;
 760 }
 761                                                                         /*}}}*/
 762 unsigned long long ServerMethod::FindMaximumObjectSizeInQueue() const   /*{{{*/
 763 {
 764    unsigned long long MaxSizeInQueue = 0;
 765    for (FetchItem *I = Queue; I != 0 && I != QueueBack; I = I->Next)
 766       MaxSizeInQueue = std::max(MaxSizeInQueue, I->MaximumSize);
 767    return MaxSizeInQueue;
 768 }
 769                                                                         /*}}}*/
 770 ServerMethod::ServerMethod(char const * const Binary, char const * const Ver,unsigned long const Flags) :/*{{{*/
 771    aptMethod(Binary, Ver, Flags), Server(nullptr), File(NULL), PipelineDepth(10),
 772    AllowRedirect(false), Debug(false)
 773 {
 774 }
 775                                                                         /*}}}*/