apt-pkg/acquire-worker.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-worker.cc,v 1.34 2001/05/22 04:42:54 jgg Exp $
   4 /* ######################################################################
   5
   6    Acquire Worker
   7
   8    The worker process can startup either as a Configuration prober
   9    or as a queue runner. As a configuration prober it only reads the
  10    configuration message and
  11
  12    ##################################################################### */
  13                                                                         /*}}}*/
  14 // Include Files                                                        /*{{{*/
  15 #include <config.h>
  16
  17 #include <apt-pkg/acquire.h>
  18 #include <apt-pkg/acquire-worker.h>
  19 #include <apt-pkg/acquire-item.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/error.h>
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/strutl.h>
  24 #include <apt-pkg/hashes.h>
  25
  26 #include <string>
  27 #include <vector>
  28 #include <iostream>
  29 #include <sstream>
  30
  31 #include <sys/stat.h>
  32 #include <stdlib.h>
  33 #include <unistd.h>
  34 #include <signal.h>
  35 #include <stdio.h>
  36 #include <errno.h>
  37
  38 #include <apti18n.h>
  39                                                                         /*}}}*/
  40
  41 using namespace std;
  42
  43 // Worker::Worker - Constructor for Queue startup                       /*{{{*/
  44 // ---------------------------------------------------------------------
  45 /* */
  46 pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf,
  47                            pkgAcquireStatus *Log) : Log(Log)
  48 {
  49    OwnerQ = Q;
  50    Config = Cnf;
  51    Access = Cnf->Access;
  52    CurrentItem = 0;
  53    TotalSize = 0;
  54    CurrentSize = 0;
  55
  56    Construct();
  57 }
  58                                                                         /*}}}*/
  59 // Worker::Worker - Constructor for method config startup               /*{{{*/
  60 // ---------------------------------------------------------------------
  61 /* */
  62 pkgAcquire::Worker::Worker(MethodConfig *Cnf)
  63 {
  64    OwnerQ = 0;
  65    Config = Cnf;
  66    Access = Cnf->Access;
  67    CurrentItem = 0;
  68    TotalSize = 0;
  69    CurrentSize = 0;
  70
  71    Construct();
  72 }
  73                                                                         /*}}}*/
  74 // Worker::Construct - Constructor helper                               /*{{{*/
  75 // ---------------------------------------------------------------------
  76 /* */
  77 void pkgAcquire::Worker::Construct()
  78 {
  79    NextQueue = 0;
  80    NextAcquire = 0;
  81    Process = -1;
  82    InFd = -1;
  83    OutFd = -1;
  84    OutReady = false;
  85    InReady = false;
  86    Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
  87 }
  88                                                                         /*}}}*/
  89 // Worker::~Worker - Destructor                                         /*{{{*/
  90 // ---------------------------------------------------------------------
  91 /* */
  92 pkgAcquire::Worker::~Worker()
  93 {
  94    close(InFd);
  95    close(OutFd);
  96
  97    if (Process > 0)
  98    {
  99       /* Closing of stdin is the signal to exit and die when the process
 100          indicates it needs cleanup */
 101       if (Config->NeedsCleanup == false)
 102          kill(Process,SIGINT);
 103       ExecWait(Process,Access.c_str(),true);
 104    }
 105 }
 106                                                                         /*}}}*/
 107 // Worker::Start - Start the worker process                             /*{{{*/
 108 // ---------------------------------------------------------------------
 109 /* This forks the method and inits the communication channel */
 110 bool pkgAcquire::Worker::Start()
 111 {
 112    // Get the method path
 113    string Method = _config->FindDir("Dir::Bin::Methods") + Access;
 114    if (FileExists(Method) == false)
 115    {
 116       _error->Error(_("The method driver %s could not be found."),Method.c_str());
 117       if (Access == "https")
 118          _error->Notice(_("Is the package %s installed?"), "apt-transport-https");
 119       return false;
 120    }
 121
 122    if (Debug == true)
 123       clog << "Starting method '" << Method << '\'' << endl;
 124
 125    // Create the pipes
 126    int Pipes[4] = {-1,-1,-1,-1};
 127    if (pipe(Pipes) != 0 || pipe(Pipes+2) != 0)
 128    {
 129       _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 130       for (int I = 0; I != 4; I++)
 131          close(Pipes[I]);
 132       return false;
 133    }
 134    for (int I = 0; I != 4; I++)
 135       SetCloseExec(Pipes[I],true);
 136
 137    // Fork off the process
 138    Process = ExecFork();
 139    if (Process == 0)
 140    {
 141       // Setup the FDs
 142       dup2(Pipes[1],STDOUT_FILENO);
 143       dup2(Pipes[2],STDIN_FILENO);
 144       SetCloseExec(STDOUT_FILENO,false);
 145       SetCloseExec(STDIN_FILENO,false);
 146       SetCloseExec(STDERR_FILENO,false);
 147
 148       const char *Args[2];
 149       Args[0] = Method.c_str();
 150       Args[1] = 0;
 151       execv(Args[0],(char **)Args);
 152       cerr << "Failed to exec method " << Args[0] << endl;
 153       _exit(100);
 154    }
 155
 156    // Fix up our FDs
 157    InFd = Pipes[0];
 158    OutFd = Pipes[3];
 159    SetNonBlock(Pipes[0],true);
 160    SetNonBlock(Pipes[3],true);
 161    close(Pipes[1]);
 162    close(Pipes[2]);
 163    OutReady = false;
 164    InReady = true;
 165
 166    // Read the configuration data
 167    if (WaitFd(InFd) == false ||
 168        ReadMessages() == false)
 169       return _error->Error(_("Method %s did not start correctly"),Method.c_str());
 170
 171    RunMessages();
 172    if (OwnerQ != 0)
 173       SendConfiguration();
 174
 175    return true;
 176 }
 177                                                                         /*}}}*/
 178 // Worker::ReadMessages - Read all pending messages into the list       /*{{{*/
 179 // ---------------------------------------------------------------------
 180 /* */
 181 bool pkgAcquire::Worker::ReadMessages()
 182 {
 183    if (::ReadMessages(InFd,MessageQueue) == false)
 184       return MethodFailure();
 185    return true;
 186 }
 187                                                                         /*}}}*/
 188 // Worker::RunMessage - Empty the message queue                         /*{{{*/
 189 // ---------------------------------------------------------------------
 190 /* This takes the messages from the message queue and runs them through
 191    the parsers in order. */
 192 bool pkgAcquire::Worker::RunMessages()
 193 {
 194    while (MessageQueue.empty() == false)
 195    {
 196       string Message = MessageQueue.front();
 197       MessageQueue.erase(MessageQueue.begin());
 198
 199       if (Debug == true)
 200          clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
 201
 202       // Fetch the message number
 203       char *End;
 204       int Number = strtol(Message.c_str(),&End,10);
 205       if (End == Message.c_str())
 206          return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());
 207
 208       string URI = LookupTag(Message,"URI");
 209       pkgAcquire::Queue::QItem *Itm = 0;
 210       if (URI.empty() == false)
 211          Itm = OwnerQ->FindItem(URI,this);
 212
 213       // update used mirror
 214       string UsedMirror = LookupTag(Message,"UsedMirror", "");
 215       if (!UsedMirror.empty() &&
 216           Itm &&
 217           Itm->Description.find(" ") != string::npos)
 218       {
 219          Itm->Description.replace(0, Itm->Description.find(" "), UsedMirror);
 220          // FIXME: will we need this as well?
 221          //Itm->ShortDesc = UsedMirror;
 222       }
 223
 224       // Determine the message number and dispatch
 225       switch (Number)
 226       {
 227          // 100 Capabilities
 228          case 100:
 229          if (Capabilities(Message) == false)
 230             return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
 231          break;
 232
 233          // 101 Log
 234          case 101:
 235          if (Debug == true)
 236             clog << " <- (log) " << LookupTag(Message,"Message") << endl;
 237          break;
 238
 239          // 102 Status
 240          case 102:
 241          Status = LookupTag(Message,"Message");
 242          break;
 243
 244          // 103 Redirect
 245          case 103:
 246          {
 247             if (Itm == 0)
 248             {
 249                _error->Error("Method gave invalid 103 Redirect message");
 250                break;
 251             }
 252
 253             string NewURI = LookupTag(Message,"New-URI",URI.c_str());
 254             Itm->URI = NewURI;
 255
 256             ItemDone();
 257
 258             pkgAcquire::Item *Owner = Itm->Owner;
 259             pkgAcquire::ItemDesc Desc = *Itm;
 260
 261             // Change the status so that it can be dequeued
 262             Owner->Status = pkgAcquire::Item::StatIdle;
 263             // Mark the item as done (taking care of all queues)
 264             // and then put it in the main queue again
 265             OwnerQ->ItemDone(Itm);
 266             OwnerQ->Owner->Enqueue(Desc);
 267
 268             if (Log != 0)
 269                Log->Done(Desc);
 270             break;
 271          }
 272
 273          // 200 URI Start
 274          case 200:
 275          {
 276             if (Itm == 0)
 277             {
 278                _error->Error("Method gave invalid 200 URI Start message");
 279                break;
 280             }
 281
 282             CurrentItem = Itm;
 283             CurrentSize = 0;
 284             TotalSize = strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10);
 285             ResumePoint = strtoull(LookupTag(Message,"Resume-Point","0").c_str(), NULL, 10);
 286             Itm->Owner->Start(Message,strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10));
 287
 288             // Display update before completion
 289             if (Log != 0 && Log->MorePulses == true)
 290                Log->Pulse(Itm->Owner->GetOwner());
 291
 292             if (Log != 0)
 293                Log->Fetch(*Itm);
 294
 295             break;
 296          }
 297
 298          // 201 URI Done
 299          case 201:
 300          {
 301             if (Itm == 0)
 302             {
 303                _error->Error("Method gave invalid 201 URI Done message");
 304                break;
 305             }
 306
 307             pkgAcquire::Item *Owner = Itm->Owner;
 308             pkgAcquire::ItemDesc Desc = *Itm;
 309
 310             // Display update before completion
 311             if (Log != 0 && Log->MorePulses == true)
 312                Log->Pulse(Owner->GetOwner());
 313
 314             OwnerQ->ItemDone(Itm);
 315             unsigned long long const ServerSize = strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10);
 316             bool isHit = StringToBool(LookupTag(Message,"IMS-Hit"),false) ||
 317                          StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false);
 318             // Using the https method the server might return 200, but the
 319             // If-Modified-Since condition is not satsified, libcurl will
 320             // discard the download. In this case, however, TotalSize will be
 321             // set to the actual size of the file, while ServerSize will be set
 322             // to 0. Therefore, if the item is marked as a hit and the
 323             // downloaded size (ServerSize) is 0, we ignore TotalSize.
 324             if (TotalSize != 0 && (!isHit || ServerSize != 0) && ServerSize != TotalSize)
 325                _error->Warning("Size of file %s is not what the server reported %s %llu",
 326                                Owner->DestFile.c_str(), LookupTag(Message,"Size","0").c_str(),TotalSize);
 327
 328             // see if there is a hash to verify
 329             string RecivedHash;
 330             HashString expectedHash(Owner->HashSum());
 331             if(!expectedHash.empty())
 332             {
 333                string hashTag = expectedHash.HashType()+"-Hash";
 334                string hashSum = LookupTag(Message, hashTag.c_str());
 335                if(!hashSum.empty())
 336                   RecivedHash = expectedHash.HashType() + ":" + hashSum;
 337                if(_config->FindB("Debug::pkgAcquire::Auth", false) == true)
 338                {
 339                   clog << "201 URI Done: " << Owner->DescURI() << endl
 340                        << "RecivedHash: " << RecivedHash << endl
 341                        << "ExpectedHash: " << expectedHash.toStr()
 342                        << endl << endl;
 343                }
 344             }
 345             Owner->Done(Message, ServerSize, RecivedHash.c_str(), Config);
 346             ItemDone();
 347
 348             // Log that we are done
 349             if (Log != 0)
 350             {
 351                if (isHit)
 352                {
 353                   /* Hide 'hits' for local only sources - we also manage to
 354                      hide gets */
 355                   if (Config->LocalOnly == false)
 356                      Log->IMSHit(Desc);
 357                }
 358                else
 359                   Log->Done(Desc);
 360             }
 361             break;
 362          }
 363
 364          // 400 URI Failure
 365          case 400:
 366          {
 367             if (Itm == 0)
 368             {
 369                _error->Error("Method gave invalid 400 URI Failure message");
 370                break;
 371             }
 372
 373             // Display update before completion
 374             if (Log != 0 && Log->MorePulses == true)
 375                Log->Pulse(Itm->Owner->GetOwner());
 376
 377             pkgAcquire::Item *Owner = Itm->Owner;
 378             pkgAcquire::ItemDesc Desc = *Itm;
 379             OwnerQ->ItemDone(Itm);
 380
 381             // set some status
 382             if(LookupTag(Message,"FailReason") == "Timeout" ||
 383                LookupTag(Message,"FailReason") == "TmpResolveFailure" ||
 384                LookupTag(Message,"FailReason") == "ResolveFailure" ||
 385                LookupTag(Message,"FailReason") == "ConnectionRefused")
 386                Owner->Status = pkgAcquire::Item::StatTransientNetworkError;
 387
 388             Owner->Failed(Message,Config);
 389             ItemDone();
 390
 391             if (Log != 0)
 392                Log->Fail(Desc);
 393
 394             break;
 395          }
 396
 397          // 401 General Failure
 398          case 401:
 399          _error->Error("Method %s General failure: %s",Access.c_str(),LookupTag(Message,"Message").c_str());
 400          break;
 401
 402          // 403 Media Change
 403          case 403:
 404          MediaChange(Message);
 405          break;
 406       }
 407    }
 408    return true;
 409 }
 410                                                                         /*}}}*/
 411 // Worker::Capabilities - 100 Capabilities handler                      /*{{{*/
 412 // ---------------------------------------------------------------------
 413 /* This parses the capabilities message and dumps it into the configuration
 414    structure. */
 415 bool pkgAcquire::Worker::Capabilities(string Message)
 416 {
 417    if (Config == 0)
 418       return true;
 419
 420    Config->Version = LookupTag(Message,"Version");
 421    Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
 422    Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
 423    Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
 424    Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
 425    Config->NeedsCleanup = StringToBool(LookupTag(Message,"Needs-Cleanup"),false);
 426    Config->Removable = StringToBool(LookupTag(Message,"Removable"),false);
 427
 428    // Some debug text
 429    if (Debug == true)
 430    {
 431       clog << "Configured access method " << Config->Access << endl;
 432       clog << "Version:" << Config->Version <<
 433               " SingleInstance:" << Config->SingleInstance <<
 434               " Pipeline:" << Config->Pipeline <<
 435               " SendConfig:" << Config->SendConfig <<
 436               " LocalOnly: " << Config->LocalOnly <<
 437               " NeedsCleanup: " << Config->NeedsCleanup <<
 438               " Removable: " << Config->Removable << endl;
 439    }
 440
 441    return true;
 442 }
 443                                                                         /*}}}*/
 444 // Worker::MediaChange - Request a media change                         /*{{{*/
 445 // ---------------------------------------------------------------------
 446 /* */
 447 bool pkgAcquire::Worker::MediaChange(string Message)
 448 {
 449    int status_fd = _config->FindI("APT::Status-Fd",-1);
 450    if(status_fd > 0)
 451    {
 452       string Media = LookupTag(Message,"Media");
 453       string Drive = LookupTag(Message,"Drive");
 454       ostringstream msg,status;
 455       ioprintf(msg,_("Please insert the disc labeled: "
 456                      "'%s' "
 457                      "in the drive '%s' and press enter."),
 458                Media.c_str(),Drive.c_str());
 459       status << "media-change: "  // message
 460              << Media  << ":"     // media
 461              << Drive  << ":"     // drive
 462              << msg.str()         // l10n message
 463              << endl;
 464
 465       std::string const dlstatus = status.str();
 466       FileFd::Write(status_fd, dlstatus.c_str(), dlstatus.size());
 467    }
 468
 469    if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
 470                                     LookupTag(Message,"Drive")) == false)
 471    {
 472       char S[300];
 473       snprintf(S,sizeof(S),"603 Media Changed\nFailed: true\n\n");
 474       if (Debug == true)
 475          clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 476       OutQueue += S;
 477       OutReady = true;
 478       return true;
 479    }
 480
 481    char S[300];
 482    snprintf(S,sizeof(S),"603 Media Changed\n\n");
 483    if (Debug == true)
 484       clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 485    OutQueue += S;
 486    OutReady = true;
 487    return true;
 488 }
 489                                                                         /*}}}*/
 490 // Worker::SendConfiguration - Send the config to the method            /*{{{*/
 491 // ---------------------------------------------------------------------
 492 /* */
 493 bool pkgAcquire::Worker::SendConfiguration()
 494 {
 495    if (Config->SendConfig == false)
 496       return true;
 497
 498    if (OutFd == -1)
 499       return false;
 500
 501    /* Write out all of the configuration directives by walking the
 502       configuration tree */
 503    std::ostringstream Message;
 504    Message << "601 Configuration\n";
 505    _config->Dump(Message, NULL, "Config-Item: %F=%V\n", false);
 506    Message << '\n';
 507
 508    if (Debug == true)
 509       clog << " -> " << Access << ':' << QuoteString(Message.str(),"\n") << endl;
 510    OutQueue += Message.str();
 511    OutReady = true;
 512
 513    return true;
 514 }
 515                                                                         /*}}}*/
 516 // Worker::QueueItem - Add an item to the outbound queue                /*{{{*/
 517 // ---------------------------------------------------------------------
 518 /* Send a URI Acquire message to the method */
 519 bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
 520 {
 521    if (OutFd == -1)
 522       return false;
 523
 524    string Message = "600 URI Acquire\n";
 525    Message.reserve(300);
 526    Message += "URI: " + Item->URI;
 527    Message += "\nFilename: " + Item->Owner->DestFile;
 528    Message += Item->Owner->Custom600Headers();
 529    Message += "\n\n";
 530
 531    if (Debug == true)
 532       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 533    OutQueue += Message;
 534    OutReady = true;
 535
 536    return true;
 537 }
 538                                                                         /*}}}*/
 539 // Worker::OutFdRead - Out bound FD is ready                            /*{{{*/
 540 // ---------------------------------------------------------------------
 541 /* */
 542 bool pkgAcquire::Worker::OutFdReady()
 543 {
 544    int Res;
 545    do
 546    {
 547       Res = write(OutFd,OutQueue.c_str(),OutQueue.length());
 548    }
 549    while (Res < 0 && errno == EINTR);
 550
 551    if (Res <= 0)
 552       return MethodFailure();
 553
 554    OutQueue.erase(0,Res);
 555    if (OutQueue.empty() == true)
 556       OutReady = false;
 557
 558    return true;
 559 }
 560                                                                         /*}}}*/
 561 // Worker::InFdRead - In bound FD is ready                              /*{{{*/
 562 // ---------------------------------------------------------------------
 563 /* */
 564 bool pkgAcquire::Worker::InFdReady()
 565 {
 566    if (ReadMessages() == false)
 567       return false;
 568    RunMessages();
 569    return true;
 570 }
 571                                                                         /*}}}*/
 572 // Worker::MethodFailure - Called when the method fails                 /*{{{*/
 573 // ---------------------------------------------------------------------
 574 /* This is called when the method is believed to have failed, probably because
 575    read returned -1. */
 576 bool pkgAcquire::Worker::MethodFailure()
 577 {
 578    _error->Error("Method %s has died unexpectedly!",Access.c_str());
 579
 580    // do not reap the child here to show meaningfull error to the user
 581    ExecWait(Process,Access.c_str(),false);
 582    Process = -1;
 583    close(InFd);
 584    close(OutFd);
 585    InFd = -1;
 586    OutFd = -1;
 587    OutReady = false;
 588    InReady = false;
 589    OutQueue = string();
 590    MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
 591
 592    return false;
 593 }
 594                                                                         /*}}}*/
 595 // Worker::Pulse - Called periodically                                  /*{{{*/
 596 // ---------------------------------------------------------------------
 597 /* */
 598 void pkgAcquire::Worker::Pulse()
 599 {
 600    if (CurrentItem == 0)
 601       return;
 602
 603    struct stat Buf;
 604    if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
 605       return;
 606    CurrentSize = Buf.st_size;
 607
 608    // Hmm? Should not happen...
 609    if (CurrentSize > TotalSize && TotalSize != 0)
 610       TotalSize = CurrentSize;
 611 }
 612                                                                         /*}}}*/
 613 // Worker::ItemDone - Called when the current item is finished          /*{{{*/
 614 // ---------------------------------------------------------------------
 615 /* */
 616 void pkgAcquire::Worker::ItemDone()
 617 {
 618    CurrentItem = 0;
 619    CurrentSize = 0;
 620    TotalSize = 0;
 621    Status = string();
 622 }
 623                                                                         /*}}}*/