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       // Determine the message number and dispatch
 204       switch (Number)
 205       {
 206          // 100 Capabilities
 207          case 100:
 208          if (Capabilities(Message) == false)
 209             return _error->Error("Unable to process Capabilities message from %s",Access.c_str());
 210          break;
 211
 212          // 101 Log
 213          case 101:
 214          if (Debug == true)
 215             clog << " <- (log) " << LookupTag(Message,"Message") << endl;
 216          break;
 217
 218          // 102 Status
 219          case 102:
 220          Status = LookupTag(Message,"Message");
 221          break;
 222
 223          // 200 URI Start
 224          case 200:
 225          {
 226             if (Itm == 0)
 227             {
 228                _error->Error("Method gave invalid 200 URI Start message");
 229                break;
 230             }
 231
 232             CurrentItem = Itm;
 233             CurrentSize = 0;
 234             TotalSize = atoi(LookupTag(Message,"Size","0").c_str());
 235             ResumePoint = atoi(LookupTag(Message,"Resume-Point","0").c_str());
 236             Itm->Owner->Start(Message,atoi(LookupTag(Message,"Size","0").c_str()));
 237
 238             // Display update before completion
 239             if (Log != 0 && Log->MorePulses == true)
 240                Log->Pulse(Itm->Owner->GetOwner());
 241
 242             if (Log != 0)
 243                Log->Fetch(*Itm);
 244
 245             break;
 246          }
 247
 248          // 201 URI Done
 249          case 201:
 250          {
 251             if (Itm == 0)
 252             {
 253                _error->Error("Method gave invalid 201 URI Done message");
 254                break;
 255             }
 256
 257             pkgAcquire::Item *Owner = Itm->Owner;
 258             pkgAcquire::ItemDesc Desc = *Itm;
 259
 260             // Display update before completion
 261             if (Log != 0 && Log->MorePulses == true)
 262                Log->Pulse(Owner->GetOwner());
 263
 264             OwnerQ->ItemDone(Itm);
 265             if (TotalSize != 0 &&
 266                 (unsigned)atoi(LookupTag(Message,"Size","0").c_str()) != TotalSize)
 267                _error->Warning("Bizarre Error - File size is not what the server reported %s %lu",
 268                                LookupTag(Message,"Size","0").c_str(),TotalSize);
 269
 270             // see if there is a hash to verify
 271             string RecivedHash;
 272             HashString expectedHash(Owner->HashSum());
 273             if(!expectedHash.empty())
 274             {
 275                string hashTag = expectedHash.HashType()+"-Hash";
 276                string hashSum = LookupTag(Message, hashTag.c_str());
 277                if(!hashSum.empty())
 278                   RecivedHash = expectedHash.HashType() + ":" + hashSum;
 279                if(_config->FindB("Debug::pkgAcquire::Auth", false) == true)
 280                {
 281                   clog << "201 URI Done: " << Owner->DescURI() << endl
 282                        << "RecivedHash: " << RecivedHash << endl
 283                        << "ExpectedHash: " << expectedHash.toStr()
 284                        << endl << endl;
 285                }
 286             }
 287             Owner->Done(Message,atoi(LookupTag(Message,"Size","0").c_str()),
 288                         RecivedHash.c_str(), Config);
 289             ItemDone();
 290
 291             // Log that we are done
 292             if (Log != 0)
 293             {
 294                if (StringToBool(LookupTag(Message,"IMS-Hit"),false) == true ||
 295                    StringToBool(LookupTag(Message,"Alt-IMS-Hit"),false) == true)
 296                {
 297                   /* Hide 'hits' for local only sources - we also manage to
 298                      hide gets */
 299                   if (Config->LocalOnly == false)
 300                      Log->IMSHit(Desc);
 301                }
 302                else
 303                   Log->Done(Desc);
 304             }
 305             break;
 306          }
 307
 308          // 400 URI Failure
 309          case 400:
 310          {
 311             if (Itm == 0)
 312             {
 313                _error->Error("Method gave invalid 400 URI Failure message");
 314                break;
 315             }
 316
 317             // Display update before completion
 318             if (Log != 0 && Log->MorePulses == true)
 319                Log->Pulse(Itm->Owner->GetOwner());
 320
 321             pkgAcquire::Item *Owner = Itm->Owner;
 322             pkgAcquire::ItemDesc Desc = *Itm;
 323             OwnerQ->ItemDone(Itm);
 324
 325             // set some status
 326             if(LookupTag(Message,"FailReason") == "Timeout" ||
 327                LookupTag(Message,"FailReason") == "TmpResolveFailure" ||
 328                LookupTag(Message,"FailReason") == "ConnectionRefused")
 329                Owner->Status = pkgAcquire::Item::StatTransientNetworkError;
 330
 331             Owner->Failed(Message,Config);
 332             ItemDone();
 333
 334             if (Log != 0)
 335                Log->Fail(Desc);
 336
 337             break;
 338          }
 339
 340          // 401 General Failure
 341          case 401:
 342          _error->Error("Method %s General failure: %s",Access.c_str(),LookupTag(Message,"Message").c_str());
 343          break;
 344
 345          // 403 Media Change
 346          case 403:
 347          MediaChange(Message);
 348          break;
 349       }
 350    }
 351    return true;
 352 }
 353                                                                         /*}}}*/
 354 // Worker::Capabilities - 100 Capabilities handler                      /*{{{*/
 355 // ---------------------------------------------------------------------
 356 /* This parses the capabilities message and dumps it into the configuration
 357    structure. */
 358 bool pkgAcquire::Worker::Capabilities(string Message)
 359 {
 360    if (Config == 0)
 361       return true;
 362
 363    Config->Version = LookupTag(Message,"Version");
 364    Config->SingleInstance = StringToBool(LookupTag(Message,"Single-Instance"),false);
 365    Config->Pipeline = StringToBool(LookupTag(Message,"Pipeline"),false);
 366    Config->SendConfig = StringToBool(LookupTag(Message,"Send-Config"),false);
 367    Config->LocalOnly = StringToBool(LookupTag(Message,"Local-Only"),false);
 368    Config->NeedsCleanup = StringToBool(LookupTag(Message,"Needs-Cleanup"),false);
 369    Config->Removable = StringToBool(LookupTag(Message,"Removable"),false);
 370
 371    // Some debug text
 372    if (Debug == true)
 373    {
 374       clog << "Configured access method " << Config->Access << endl;
 375       clog << "Version:" << Config->Version <<
 376               " SingleInstance:" << Config->SingleInstance <<
 377               " Pipeline:" << Config->Pipeline <<
 378               " SendConfig:" << Config->SendConfig <<
 379               " LocalOnly: " << Config->LocalOnly <<
 380               " NeedsCleanup: " << Config->NeedsCleanup <<
 381               " Removable: " << Config->Removable << endl;
 382    }
 383
 384    return true;
 385 }
 386                                                                         /*}}}*/
 387 // Worker::MediaChange - Request a media change                         /*{{{*/
 388 // ---------------------------------------------------------------------
 389 /* */
 390 bool pkgAcquire::Worker::MediaChange(string Message)
 391 {
 392    int status_fd = _config->FindI("APT::Status-Fd",-1);
 393    if(status_fd > 0)
 394    {
 395       string Media = LookupTag(Message,"Media");
 396       string Drive = LookupTag(Message,"Drive");
 397       ostringstream msg,status;
 398       ioprintf(msg,_("Please insert the disc labeled: "
 399                      "'%s' "
 400                      "in the drive '%s' and press enter."),
 401                Media.c_str(),Drive.c_str());
 402       status << "media-change: "  // message
 403              << Media  << ":"     // media
 404              << Drive  << ":"     // drive
 405              << msg.str()         // l10n message
 406              << endl;
 407       write(status_fd, status.str().c_str(), status.str().size());
 408    }
 409
 410    if (Log == 0 || Log->MediaChange(LookupTag(Message,"Media"),
 411                                     LookupTag(Message,"Drive")) == false)
 412    {
 413       char S[300];
 414       snprintf(S,sizeof(S),"603 Media Changed\nFailed: true\n\n");
 415       if (Debug == true)
 416          clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 417       OutQueue += S;
 418       OutReady = true;
 419       return true;
 420    }
 421
 422    char S[300];
 423    snprintf(S,sizeof(S),"603 Media Changed\n\n");
 424    if (Debug == true)
 425       clog << " -> " << Access << ':' << QuoteString(S,"\n") << endl;
 426    OutQueue += S;
 427    OutReady = true;
 428    return true;
 429 }
 430                                                                         /*}}}*/
 431 // Worker::SendConfiguration - Send the config to the method            /*{{{*/
 432 // ---------------------------------------------------------------------
 433 /* */
 434 bool pkgAcquire::Worker::SendConfiguration()
 435 {
 436    if (Config->SendConfig == false)
 437       return true;
 438
 439    if (OutFd == -1)
 440       return false;
 441
 442    string Message = "601 Configuration\n";
 443    Message.reserve(2000);
 444
 445    /* Write out all of the configuration directives by walking the
 446       configuration tree */
 447    const Configuration::Item *Top = _config->Tree(0);
 448    for (; Top != 0;)
 449    {
 450       if (Top->Value.empty() == false)
 451       {
 452          string Line = "Config-Item: " + QuoteString(Top->FullTag(),"=\"\n") + "=";
 453          Line += QuoteString(Top->Value,"\n") + '\n';
 454          Message += Line;
 455       }
 456
 457       if (Top->Child != 0)
 458       {
 459          Top = Top->Child;
 460          continue;
 461       }
 462
 463       while (Top != 0 && Top->Next == 0)
 464          Top = Top->Parent;
 465       if (Top != 0)
 466          Top = Top->Next;
 467    }
 468    Message += '\n';
 469
 470    if (Debug == true)
 471       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 472    OutQueue += Message;
 473    OutReady = true;
 474
 475    return true;
 476 }
 477                                                                         /*}}}*/
 478 // Worker::QueueItem - Add an item to the outbound queue                /*{{{*/
 479 // ---------------------------------------------------------------------
 480 /* Send a URI Acquire message to the method */
 481 bool pkgAcquire::Worker::QueueItem(pkgAcquire::Queue::QItem *Item)
 482 {
 483    if (OutFd == -1)
 484       return false;
 485
 486    string Message = "600 URI Acquire\n";
 487    Message.reserve(300);
 488    Message += "URI: " + Item->URI;
 489    Message += "\nFilename: " + Item->Owner->DestFile;
 490    Message += Item->Owner->Custom600Headers();
 491    Message += "\n\n";
 492
 493    if (Debug == true)
 494       clog << " -> " << Access << ':' << QuoteString(Message,"\n") << endl;
 495    OutQueue += Message;
 496    OutReady = true;
 497
 498    return true;
 499 }
 500                                                                         /*}}}*/
 501 // Worker::OutFdRead - Out bound FD is ready                            /*{{{*/
 502 // ---------------------------------------------------------------------
 503 /* */
 504 bool pkgAcquire::Worker::OutFdReady()
 505 {
 506    int Res;
 507    do
 508    {
 509       Res = write(OutFd,OutQueue.c_str(),OutQueue.length());
 510    }
 511    while (Res < 0 && errno == EINTR);
 512
 513    if (Res <= 0)
 514       return MethodFailure();
 515
 516    // Hmm.. this should never happen.
 517    if (Res < 0)
 518       return true;
 519
 520    OutQueue.erase(0,Res);
 521    if (OutQueue.empty() == true)
 522       OutReady = false;
 523
 524    return true;
 525 }
 526                                                                         /*}}}*/
 527 // Worker::InFdRead - In bound FD is ready                              /*{{{*/
 528 // ---------------------------------------------------------------------
 529 /* */
 530 bool pkgAcquire::Worker::InFdReady()
 531 {
 532    if (ReadMessages() == false)
 533       return false;
 534    RunMessages();
 535    return true;
 536 }
 537                                                                         /*}}}*/
 538 // Worker::MethodFailure - Called when the method fails                 /*{{{*/
 539 // ---------------------------------------------------------------------
 540 /* This is called when the method is belived to have failed, probably because
 541    read returned -1. */
 542 bool pkgAcquire::Worker::MethodFailure()
 543 {
 544    _error->Error("Method %s has died unexpectedly!",Access.c_str());
 545
 546    ExecWait(Process,Access.c_str(),true);
 547    Process = -1;
 548    close(InFd);
 549    close(OutFd);
 550    InFd = -1;
 551    OutFd = -1;
 552    OutReady = false;
 553    InReady = false;
 554    OutQueue = string();
 555    MessageQueue.erase(MessageQueue.begin(),MessageQueue.end());
 556
 557    return false;
 558 }
 559                                                                         /*}}}*/
 560 // Worker::Pulse - Called periodically                                  /*{{{*/
 561 // ---------------------------------------------------------------------
 562 /* */
 563 void pkgAcquire::Worker::Pulse()
 564 {
 565    if (CurrentItem == 0)
 566       return;
 567
 568    struct stat Buf;
 569    if (stat(CurrentItem->Owner->DestFile.c_str(),&Buf) != 0)
 570       return;
 571    CurrentSize = Buf.st_size;
 572
 573    // Hmm? Should not happen...
 574    if (CurrentSize > TotalSize && TotalSize != 0)
 575       TotalSize = CurrentSize;
 576 }
 577                                                                         /*}}}*/
 578 // Worker::ItemDone - Called when the current item is finished          /*{{{*/
 579 // ---------------------------------------------------------------------
 580 /* */
 581 void pkgAcquire::Worker::ItemDone()
 582 {
 583    CurrentItem = 0;
 584    CurrentSize = 0;
 585    TotalSize = 0;
 586    Status = string();
 587 }
 588                                                                         /*}}}*/