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