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-worker.h>
  18 #include <apt-pkg/acquire-item.h>
  19 #include <apt-pkg/configuration.h>
  20 #include <apt-pkg/error.h>
  21 #include <apt-pkg/fileutl.h>
  22 #include <apt-pkg/strutl.h>
  23
  24 #include <iostream>
  25 #include <sstream>
  26 #include <fstream>
  27
  28 #include <sys/stat.h>
  29 #include <unistd.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #include <stdio.h>
  33 #include <errno.h>
  34
  35 #include <apti18n.h>
  36                                                                         /*}}}*/
  37
  38 using namespace std;
  39
  40 // Worker::Worker - Constructor for Queue startup                       /*{{{*/
  41 // ---------------------------------------------------------------------
  42 /* */
  43 pkgAcquire::Worker::Worker(Queue *Q,MethodConfig *Cnf,
  44                            pkgAcquireStatus *Log) : Log(Log)
  45 {
  46    OwnerQ = Q;
  47    Config = Cnf;
  48    Access = Cnf->Access;
  49    CurrentItem = 0;
  50    TotalSize = 0;
  51    CurrentSize = 0;
  52
  53    Construct();
  54 }
  55                                                                         /*}}}*/
  56 // Worker::Worker - Constructor for method config startup               /*{{{*/
  57 // ---------------------------------------------------------------------
  58 /* */
  59 pkgAcquire::Worker::Worker(MethodConfig *Cnf)
  60 {
  61    OwnerQ = 0;
  62    Config = Cnf;
  63    Access = Cnf->Access;
  64    CurrentItem = 0;
  65    TotalSize = 0;
  66    CurrentSize = 0;
  67
  68    Construct();
  69 }
  70                                                                         /*}}}*/
  71 // Worker::Construct - Constructor helper                               /*{{{*/
  72 // ---------------------------------------------------------------------
  73 /* */
  74 void pkgAcquire::Worker::Construct()
  75 {
  76    NextQueue = 0;
  77    NextAcquire = 0;
  78    Process = -1;
  79    InFd = -1;
  80    OutFd = -1;
  81    OutReady = false;
  82    InReady = false;
  83    Debug = _config->FindB("Debug::pkgAcquire::Worker",false);
  84 }
  85                                                                         /*}}}*/
  86 // Worker::~Worker - Destructor                                         /*{{{*/
  87 // ---------------------------------------------------------------------
  88 /* */
  89 pkgAcquire::Worker::~Worker()
  90 {
  91    close(InFd);
  92    close(OutFd);
  93
  94    if (Process > 0)
  95    {
  96       /* Closing of stdin is the signal to exit and die when the process
  97          indicates it needs cleanup */
  98       if (Config->NeedsCleanup == false)
  99          kill(Process,SIGINT);
 100       ExecWait(Process,Access.c_str(),true);
 101    }
 102 }
 103                                                                         /*}}}*/
 104 // Worker::Start - Start the worker process                             /*{{{*/
 105 // ---------------------------------------------------------------------
 106 /* This forks the method and inits the communication channel */
 107 bool pkgAcquire::Worker::Start()
 108 {
 109    // Get the method path
 110    string Method = _config->FindDir("Dir::Bin::Methods") + Access;
 111    if (FileExists(Method) == false)
 112       return _error->Error(_("The method driver %s could not be found."),Method.c_str());
 113
 114    if (Debug == true)
 115       clog << "Starting method '" << Method << '\'' << endl;
 116
 117    // Create the pipes
 118    int Pipes[4] = {-1,-1,-1,-1};
 119    if (pipe(Pipes) != 0 || pipe(Pipes+2) != 0)
 120    {
 121       _error->Errno("pipe","Failed to create IPC pipe to subprocess");
 122       for (int I = 0; I != 4; I++)
 123          close(Pipes[I]);
 124       return false;
 125    }
 126    for (int I = 0; I != 4; I++)
 127       SetCloseExec(Pipes[I],true);
 128
 129    // Fork off the process
 130    Process = ExecFork();
 131    if (Process == 0)
 132    {
 133       // Setup the FDs
 134       dup2(Pipes[1],STDOUT_FILENO);
 135       dup2(Pipes[2],STDIN_FILENO);
 136       SetCloseExec(STDOUT_FILENO,false);
 137       SetCloseExec(STDIN_FILENO,false);
 138       SetCloseExec(STDERR_FILENO,false);
 139
 140       const char *Args[2];
 141       Args[0] = Method.c_str();
 142       Args[1] = 0;
 143       execv(Args[0],(char **)Args);
 144       cerr << "Failed to exec method " << Args[0] << endl;
 145       _exit(100);
 146    }
 147
 148    // Fix up our FDs
 149    InFd = Pipes[0];
 150    OutFd = Pipes[3];
 151    SetNonBlock(Pipes[0],true);
 152    SetNonBlock(Pipes[3],true);
 153    close(Pipes[1]);
 154    close(Pipes[2]);
 155    OutReady = false;
 156    InReady = true;
 157
 158    // Read the configuration data
 159    if (WaitFd(InFd) == false ||
 160        ReadMessages() == false)
 161       return _error->Error(_("Method %s did not start correctly"),Method.c_str());
 162
 163    RunMessages();
 164    if (OwnerQ != 0)
 165       SendConfiguration();
 166
 167    return true;
 168 }
 169                                                                         /*}}}*/
 170 // Worker::ReadMessages - Read all pending messages into the list       /*{{{*/
 171 // ---------------------------------------------------------------------
 172 /* */
 173 bool pkgAcquire::Worker::ReadMessages()
 174 {
 175    if (::ReadMessages(InFd,MessageQueue) == false)
 176       return MethodFailure();
 177    return true;
 178 }
 179                                                                         /*}}}*/
 180 // Worker::RunMessage - Empty the message queue                         /*{{{*/
 181 // ---------------------------------------------------------------------
 182 /* This takes the messages from the message queue and runs them through
 183    the parsers in order. */
 184 bool pkgAcquire::Worker::RunMessages()
 185 {
 186    while (MessageQueue.empty() == false)
 187    {
 188       string Message = MessageQueue.front();
 189       MessageQueue.erase(MessageQueue.begin());
 190
 191       if (Debug == true)
 192          clog << " <- " << Access << ':' << QuoteString(Message,"\n") << endl;
 193
 194       // Fetch the message number
 195       char *End;
 196       int Number = strtol(Message.c_str(),&End,10);
 197       if (End == Message.c_str())
 198          return _error->Error("Invalid message from method %s: %s",Access.c_str(),Message.c_str());
 199
 200       string URI = LookupTag(Message,"URI");
 201       pkgAcquire::Queue::QItem *Itm = 0;
 202       if (URI.empty() == false)
 203          Itm = OwnerQ->FindItem(URI,this);
 204
 205       // update used mirror
 206       string UsedMirror = LookupTag(Message,"UsedMirror", "");
 207       if (!UsedMirror.empty() &&
 208           Itm &&
 209           Itm->Description.find(" ") != string::npos)
 210       {
 211          Itm->Description.replace(0, Itm->Description.find(" "), UsedMirror);
 212          // FIXME: will we need this as well?
 213          //Itm->ShortDesc = UsedMirror;
 214       }
 215
 216       // Determine the message number and dispatch
 217       switch (Number)
 218       {
 219          // 100 Capabilities
 220          case 100:
 221          if (Capabilities(Message) == false)
 222             return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
 223          break;
 224
 225          // 101 Log
 226          case 101:
 227          if (Debug == true)
 228             clog << " <- (log) " << LookupTag(Message,"Message") << endl;
 229          break;
 230
 231          // 102 Status
 232          case 102:
 233          Status = LookupTag(Message,"Message");
 234          break;
 235
 236          // 103 Redirect
 237          case 103:
 238          {
 239             if (Itm == 0)
 240             {
 241                _error->Error("Method gave invalid 103 Redirect message");
 242                break;
 243             }
 244
 245             string NewURI = LookupTag(Message,"New-URI",URI.c_str());
 246             Itm->URI = NewURI;
 247             break;
 248          }
 249
 250          // 200 URI Start
 251          case 200:
 252          {
 253             if (Itm == 0)
 254             {
 255                _error->Error("Method gave invalid 200 URI Start message");
 256                break;
 257             }
 258
 259             CurrentItem = Itm;
 260             CurrentSize = 0;
 261             TotalSize = strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10);
 262             ResumePoint = strtoull(LookupTag(Message,"Resume-Point","0").c_str(), NULL, 10);
 263             Itm->Owner->Start(Message,strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10));
 264
 265             // Display update before completion
 266             if (Log != 0 && Log->MorePulses == true)
 267                Log->Pulse(Itm->Owner->GetOwner());
 268
 269             if (Log != 0)
 270                Log->Fetch(*Itm);
 271
 272             break;
 273          }
 274
 275          // 201 URI Done
 276          case 201:
 277          {
 278             if (Itm == 0)
 279             {
 280                _error->Error("Method gave invalid 201 URI Done message");
 281                break;
 282             }
 283
 284             pkgAcquire::Item *Owner = Itm->Owner;
 285             pkgAcquire::ItemDesc Desc = *Itm;
 286
 287             // Display update before completion
 288             if (Log != 0 && Log->MorePulses == true)
 289                Log->Pulse(Owner->GetOwner());
 290
 291             OwnerQ->ItemDone(Itm);
 292             unsigned long long const ServerSize = strtoull(LookupTag(Message,"Size","0").c_str(), NULL, 10);
 293             if (TotalSize != 0 && ServerSize != TotalSize)
 294                _error->Warning("Size of file %s is not what the server reported %s %llu",
 295                                Owner->DestFile.c_str(), LookupTag(Message,"Size","0").c_str(),TotalSize);
 296
 297             // see if there is a hash to verify
 298             string RecivedHash;
 299             HashString expectedHash(Owner->HashSum());
 300             if(!expectedHash.empty())
 301             {
 302                string hashTag = expectedHash.HashType()+"-Hash";
 303                string hashSum = LookupTag(Message, hashTag.c_str());
 304                if(!hashSum.empty())
 305                   RecivedHash = expectedHash.HashType() + ":" + hashSum;
 306                if(_config->FindB("Debug::pkgAcquire::Auth", false) == true)
 307                {
 308                   clog << "201 URI Done: " << Owner->DescURI() << endl
 309                        << "RecivedHash: " << RecivedHash << endl
 310                        << "ExpectedHash: " << expectedHash.toStr()
 311                        << endl << endl;
 312                }
 313             }
 314             Owner->Done(Message, ServerSize, RecivedHash.c_str(), Config);
 315             ItemDone();
 316
 317             // Log that we are done
 318             if (Log != 0)
 319             {
 320                if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true ||
 321                    StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 322                {
 323                   /* Hide 'hits' for local only sources - we also manage to
 324                      hide gets */
 325                   if (Config->LocalOnly == false)
 326                      Log->IMSHit(Desc);
 327                }
 328                else
 329                   Log->Done(Desc);
 330             }
 331             break;
 332          }
 333
 334          // 400 URI Failure
 335          case 400:
 336          {
 337             if (Itm == 0)
 338             {
 339                _error->Error("Method gave invalid 400 URI Failure message");
 340                break;
 341             }
 342
 343             // Display update before completion
 344             if (Log != 0 && Log->MorePulses == true)
 345                Log->Pulse(Itm->Owner->GetOwner());
 346
 347             pkgAcquire::Item *Owner = Itm->Owner;
 348             pkgAcquire::ItemDesc Desc = *Itm;
 349             OwnerQ->ItemDone(Itm);
 350
 351             // set some status
 352             if(LookupTag(Message,"FailReason") == "Timeout" ||
 353                LookupTag(Message,"FailReason") == "TmpResolveFailure" ||
 354                LookupTag(Message,"FailReason") == "ResolveFailure" ||
 355                LookupTag(Message,"FailReason") == "ConnectionRefused")
 356                Owner->Status = pkgAcquire::Item::StatTransientNetworkError;
 357
 358             Owner->Failed(Message,Config);
 359             ItemDone();
 360
 361             if (Log != 0)
 362                Log->Fail(Desc);
 363
 364             break;
 365          }
 366
 367          // 401 General Failure
 368          case 401:
 369          _error->Error("Method %s General failure: %s",Access.c_str(),LookupTag(Message,"Message").c_str());
 370          break;
 371
 372          // 403 Media Change
 373          case 403:
 374          MediaChange(Message);
 375          break;
 376       }
 377    }
 378    return true;
 379 }
 380                                                                         /*}}}*/
 381 // Worker::Capabilities - 100 Capabilities handler                      /*{{{*/
 382 // ---------------------------------------------------------------------
 383 /* This parses the capabilities message and dumps it into the configuration
 384    structure. */
 385 bool pkgAcquire::Worker::Capabilities(string Message)
 386 {
 387    if (Config == 0)
 388       return true;
 389
 390    Config->Version = LookupTag(Message,"Version");
 391    Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
 392    Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
 393    Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
 394    Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
 395    Config->NeedsCleanup = StringToBool(LookupTag(Message,"Needs-Cleanup"),false);
 396    Config->Removable = StringToBool(LookupTag(Message,"Removable"),false);
 397
 398    // Some debug text
 399    if (Debug == true)
 400    {
 401       clog << "Configured access method " << Config->Access << endl;
 402       clog << "Version:" << Config->Version <<
 403               " SingleInstance:" << Config->SingleInstance <<
 404               " Pipeline:" << Config->Pipeline <<
 405               " SendConfig:" << Config->SendConfig <<
 406               " LocalOnly: " << Config->LocalOnly <<
 407               " NeedsCleanup: " << Config->NeedsCleanup <<
 408               " Removable: " << Config->Removable << endl;
 409    }
 410
 411    return true;
 412 }
 413                                                                         /*}}}*/
 414 // Worker::MediaChange - Request a media change                         /*{{{*/
 415 // ---------------------------------------------------------------------
 416 /* */
 417 bool pkgAcquire::Worker::MediaChange(string Message)
 418 {
 419    int status_fd = _config->FindI("APT::Status-Fd",-1);
 420    if(status_fd > 0)
 421    {
 422       string Media = LookupTag(Message,"Media");
 423       string Drive = LookupTag(Message,"Drive");
 424       ostringstream msg,status;
 425       ioprintf(msg,_("Please insert the disc labeled: "
 426                      "'%s' "
 427                      "in the drive '%s' and press enter."),
 428                Media.c_str(),Drive.c_str());
 429       status << "media-change: "  // message
 430              << Media  << ":"     // media
 431              << Drive  << ":"     // drive
 432              << msg.str()         // l10n message
 433              << endl;
 434
 435       std::string const dlstatus = status.str();
 436       size_t done = 0;
 437       size_t todo = dlstatus.size();
 438       errno = 0;
 439       int res = 0;
 440       do
 441       {
 442          res = write(status_fd, dlstatus.c_str() + done, todo);
 443          if (res < 0 && errno == EINTR)
 444             continue;
 445          if (res < 0)
 446             break;
 447          done += res;
 448          todo -= res;
 449       }
 450       while (res > 0 && todo > 0);
 451    }
 452
 453    if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
 454                                     LookupTag(Message,"Drive")) == false)
 455    {
 456       char S[300];
 457       snprintf(S,sizeof(S),"603 Media Changed\nFailed: true\n\n");
 458       if (Debug == true)
 459          clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 460       OutQueue += S;
 461       OutReady = true;
 462       return true;
 463    }
 464
 465    char S[300];
 466    snprintf(S,sizeof(S),"603 Media Changed\n\n");
 467    if (Debug == true)
 468       clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 469    OutQueue += S;
 470    OutReady = true;
 471    return true;
 472 }
 473                                                                         /*}}}*/
 474 // Worker::SendConfiguration - Send the config to the method            /*{{{*/
 475 // ---------------------------------------------------------------------
 476 /* */
 477 bool pkgAcquire::Worker::SendConfiguration()
 478 {
 479    if (Config->SendConfig == false)
 480       return true;
 481
 482    if (OutFd == -1)
 483       return false;
 484
 485    string Message = "601 Configuration\n";
 486    Message.reserve(2000);
 487
 488    /* Write out all of the configuration directives by walking the
 489       configuration tree */
 490    const Configuration::Item *Top = _config->Tree(0);
 491    for (; Top != 0;)
 492    {
 493       if (Top->Value.empty() == false)
 494       {
 495          string Line = "Config-Item: " + QuoteString(Top->FullTag(),"=\"\n") + "=";
 496          Line += QuoteString(Top->Value,"\n") + '\n';
 497          Message += Line;
 498       }
 499
 500       if (Top->Child != 0)
 501       {
 502          Top = Top->Child;
 503          continue;
 504       }
 505
 506       while (Top != 0 && Top->Next == 0)
 507          Top = Top->Parent;
 508       if (Top != 0)
 509          Top = Top->Next;
 510    }
 511    Message += '\n';
 512
 513    if (Debug == true)
 514       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 515    OutQueue += Message;
 516    OutReady = true;
 517
 518    return true;
 519 }
 520                                                                         /*}}}*/
 521 // Worker::QueueItem - Add an item to the outbound queue                /*{{{*/
 522 // ---------------------------------------------------------------------
 523 /* Send a URI Acquire message to the method */
 524 bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
 525 {
 526    if (OutFd == -1)
 527       return false;
 528
 529    string Message = "600 URI Acquire\n";
 530    Message.reserve(300);
 531    Message += "URI: " + Item->URI;
 532    Message += "\nFilename: " + Item->Owner->DestFile;
 533    Message += Item->Owner->Custom600Headers();
 534    Message += "\n\n";
 535
 536    if (Debug == true)
 537       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 538    OutQueue += Message;
 539    OutReady = true;
 540
 541    return true;
 542 }
 543                                                                         /*}}}*/
 544 // Worker::OutFdRead - Out bound FD is ready                            /*{{{*/
 545 // ---------------------------------------------------------------------
 546 /* */
 547 bool pkgAcquire::Worker::OutFdReady()
 548 {
 549    int Res;
 550    do
 551    {
 552       Res = write(OutFd,OutQueue.c_str(),OutQueue.length());
 553    }
 554    while (Res < 0 && errno == EINTR);
 555
 556    if (Res <= 0)
 557       return MethodFailure();
 558
 559    OutQueue.erase(0,Res);
 560    if (OutQueue.empty() == true)
 561       OutReady = false;
 562
 563    return true;
 564 }
 565                                                                         /*}}}*/
 566 // Worker::InFdRead - In bound FD is ready                              /*{{{*/
 567 // ---------------------------------------------------------------------
 568 /* */
 569 bool pkgAcquire::Worker::InFdReady()
 570 {
 571    if (ReadMessages() == false)
 572       return false;
 573    RunMessages();
 574    return true;
 575 }
 576                                                                         /*}}}*/
 577 // Worker::MethodFailure - Called when the method fails                 /*{{{*/
 578 // ---------------------------------------------------------------------
 579 /* This is called when the method is belived to have failed, probably because
 580    read returned -1. */
 581 bool pkgAcquire::Worker::MethodFailure()
 582 {
 583    _error->Error("Method %s has died unexpectedly!",Access.c_str());
 584
 585    // do not reap the child here to show meaningfull error to the user
 586    ExecWait(Process,Access.c_str(),false);
 587    Process = -1;
 588    close(InFd);
 589    close(OutFd);
 590    InFd = -1;
 591    OutFd = -1;
 592    OutReady = false;
 593    InReady = false;
 594    OutQueue = string();
 595    MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
 596
 597    return false;
 598 }
 599                                                                         /*}}}*/
 600 // Worker::Pulse - Called periodically                                  /*{{{*/
 601 // ---------------------------------------------------------------------
 602 /* */
 603 void pkgAcquire::Worker::Pulse()
 604 {
 605    if (CurrentItem == 0)
 606       return;
 607
 608    struct stat Buf;
 609    if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
 610       return;
 611    CurrentSize = Buf.st_size;
 612
 613    // Hmm? Should not happen...
 614    if (CurrentSize > TotalSize && TotalSize != 0)
 615       TotalSize = CurrentSize;
 616 }
 617                                                                         /*}}}*/
 618 // Worker::ItemDone - Called when the current item is finished          /*{{{*/
 619 // ---------------------------------------------------------------------
 620 /* */
 621 void pkgAcquire::Worker::ItemDone()
 622 {
 623    CurrentItem = 0;
 624    CurrentSize = 0;
 625    TotalSize = 0;
 626    Status = string();
 627 }
 628                                                                         /*}}}*/