apt-pkg/acquire-method.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: acquire-method.cc,v 1.27.2.1 2003/12/24 23:09:17 mdz Exp $
   4 /* ######################################################################
   5
   6    Acquire Method
   7
   8    This is a skeleton class that implements most of the functionality
   9    of a method and some useful functions to make method implementation
  10    simpler. The methods all derive this and specialize it. The most
  11    complex implementation is the http method which needs to provide
  12    pipelining, it runs the message engine at the same time it is
  13    downloading files..
  14
  15    ##################################################################### */
  16                                                                         /*}}}*/
  17 // Include Files                                                        /*{{{*/
  18 #include <apt-pkg/acquire-method.h>
  19 #include <apt-pkg/error.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/strutl.h>
  22 #include <apt-pkg/fileutl.h>
  23 #include <apt-pkg/hashes.h>
  24
  25 #include <iostream>
  26 #include <stdio.h>
  27 #include <sys/signal.h>
  28                                                                         /*}}}*/
  29
  30 using namespace std;
  31
  32 // AcqMethod::pkgAcqMethod - Constructor                                /*{{{*/
  33 // ---------------------------------------------------------------------
  34 /* This constructs the initialization text */
  35 pkgAcqMethod::pkgAcqMethod(const char *Ver,unsigned long Flags)
  36 {
  37    std::cout << "100 Capabilities\n"
  38              << "Version: " << Ver << "\n";
  39
  40    if ((Flags & SingleInstance) == SingleInstance)
  41       std::cout << "Single-Instance: true\n";
  42
  43    if ((Flags & Pipeline) == Pipeline)
  44       std::cout << "Pipeline: true\n";
  45
  46    if ((Flags & SendConfig) == SendConfig)
  47       std::cout << "Send-Config: true\n";
  48
  49    if ((Flags & LocalOnly) == LocalOnly)
  50       std::cout <<"Local-Only: true\n";
  51
  52    if ((Flags & NeedsCleanup) == NeedsCleanup)
  53       std::cout << "Needs-Cleanup: true\n";
  54
  55    if ((Flags & Removable) == Removable)
  56       std::cout << "Removable: true\n";
  57
  58    std::cout << "\n" << std::flush;
  59
  60    SetNonBlock(STDIN_FILENO,true);
  61
  62    Queue = 0;
  63    QueueBack = 0;
  64 }
  65                                                                         /*}}}*/
  66 // AcqMethod::Fail - A fetch has failed                                 /*{{{*/
  67 // ---------------------------------------------------------------------
  68 /* */
  69 void pkgAcqMethod::Fail(bool Transient)
  70 {
  71    string Err = "Undetermined Error";
  72    if (_error->empty() == false)
  73       _error->PopMessage(Err);
  74    _error->Discard();
  75    Fail(Err,Transient);
  76 }
  77                                                                         /*}}}*/
  78 // AcqMethod::Fail - A fetch has failed                                 /*{{{*/
  79 // ---------------------------------------------------------------------
  80 /* */
  81 void pkgAcqMethod::Fail(string Err,bool Transient)
  82 {
  83    // Strip out junk from the error messages
  84    for (string::iterator I = Err.begin(); I != Err.end(); I++)
  85    {
  86       if (*I == '\r')
  87          *I = ' ';
  88       if (*I == '\n')
  89          *I = ' ';
  90    }
  91
  92    if (Queue != 0)
  93    {
  94       std::cout << "400 URI Failure\nURI: " << Queue->Uri << "\n"
  95                 << "Message: " << Err << " " << IP << "\n";
  96       // Dequeue
  97       FetchItem *Tmp = Queue;
  98       Queue = Queue->Next;
  99       delete Tmp;
 100       if (Tmp == QueueBack)
 101          QueueBack = Queue;
 102    }
 103    else
 104       std::cout << "400 URI Failure\nURI: <UNKNOWN>\nMessage: " << Err << "\n";
 105
 106    if(FailReason.empty() == false)
 107       std::cout << "FailReason: " << FailReason << "\n";
 108    if (UsedMirror.empty() == false)
 109       std::cout << "UsedMirror: " << UsedMirror << "\n";
 110    // Set the transient flag
 111    if (Transient == true)
 112       std::cout << "Transient-Failure: true\n";
 113
 114    std::cout << "\n" << std::flush;
 115 }
 116                                                                         /*}}}*/
 117 // AcqMethod::URIStart - Indicate a download is starting                /*{{{*/
 118 // ---------------------------------------------------------------------
 119 /* */
 120 void pkgAcqMethod::URIStart(FetchResult &Res)
 121 {
 122    if (Queue == 0)
 123       abort();
 124
 125    std::cout << "200 URI Start\n"
 126              << "URI: " << Queue->Uri << "\n";
 127    if (Res.Size != 0)
 128       std::cout << "Size: " << Res.Size << "\n";
 129
 130    if (Res.LastModified != 0)
 131       std::cout << "Last-Modified: " << TimeRFC1123(Res.LastModified) << "\n";
 132
 133    if (Res.ResumePoint != 0)
 134       std::cout << "Resume-Point: " << Res.ResumePoint << "\n";
 135
 136    if (UsedMirror.empty() == false)
 137       std::cout << "UsedMirror: " << UsedMirror << "\n";
 138
 139    std::cout << "\n" << std::flush;
 140 }
 141                                                                         /*}}}*/
 142 // AcqMethod::URIDone - A URI is finished                               /*{{{*/
 143 // ---------------------------------------------------------------------
 144 /* */
 145 void pkgAcqMethod::URIDone(FetchResult &Res, FetchResult *Alt)
 146 {
 147    if (Queue == 0)
 148       abort();
 149
 150    std::cout << "201 URI Done\n"
 151              << "URI: " << Queue->Uri << "\n";
 152
 153    if (Res.Filename.empty() == false)
 154       std::cout << "Filename: " << Res.Filename << "\n";
 155
 156    if (Res.Size != 0)
 157       std::cout << "Size: " << Res.Size << "\n";
 158
 159    if (Res.LastModified != 0)
 160       std::cout << "Last-Modified: " << TimeRFC1123(Res.LastModified) << "\n";
 161
 162    if (Res.MD5Sum.empty() == false)
 163       std::cout << "MD5-Hash: " << Res.MD5Sum << "\n"
 164                 << "MD5Sum-Hash: " << Res.MD5Sum << "\n";
 165    if (Res.SHA1Sum.empty() == false)
 166       std::cout << "SHA1-Hash: " << Res.SHA1Sum << "\n";
 167    if (Res.SHA256Sum.empty() == false)
 168       std::cout << "SHA256-Hash: " << Res.SHA256Sum << "\n";
 169    if (UsedMirror.empty() == false)
 170       std::cout << "UsedMirror: " << UsedMirror << "\n";
 171    if (Res.GPGVOutput.empty() == false)
 172    {
 173       std::cout << "GPGVOutput:\n";
 174       for (vector<string>::const_iterator I = Res.GPGVOutput.begin();
 175            I != Res.GPGVOutput.end(); ++I)
 176          std::cout << " " << *I << "\n";
 177    }
 178
 179    if (Res.ResumePoint != 0)
 180       std::cout << "Resume-Point: " << Res.ResumePoint << "\n";
 181
 182    if (Res.IMSHit == true)
 183       std::cout << "IMS-Hit: true\n";
 184
 185    if (Alt != 0)
 186    {
 187       if (Alt->Filename.empty() == false)
 188          std::cout << "Alt-Filename: " << Alt->Filename << "\n";
 189
 190       if (Alt->Size != 0)
 191          std::cout << "Alt-Size: " << Alt->Size << "\n";
 192
 193       if (Alt->LastModified != 0)
 194          std::cout << "Alt-Last-Modified: " << TimeRFC1123(Alt->LastModified) << "\n";
 195
 196       if (Alt->MD5Sum.empty() == false)
 197          std::cout << "Alt-MD5-Hash: " << Alt->MD5Sum << "\n";
 198       if (Alt->SHA1Sum.empty() == false)
 199          std::cout << "Alt-SHA1-Hash: " << Alt->SHA1Sum << "\n";
 200       if (Alt->SHA256Sum.empty() == false)
 201          std::cout << "Alt-SHA256-Hash: " << Alt->SHA256Sum << "\n";
 202
 203       if (Alt->IMSHit == true)
 204          std::cout << "Alt-IMS-Hit: true\n";
 205    }
 206
 207    std::cout << "\n" << std::flush;
 208
 209    // Dequeue
 210    FetchItem *Tmp = Queue;
 211    Queue = Queue->Next;
 212    delete Tmp;
 213    if (Tmp == QueueBack)
 214       QueueBack = Queue;
 215 }
 216                                                                         /*}}}*/
 217 // AcqMethod::MediaFail - Syncronous request for new media              /*{{{*/
 218 // ---------------------------------------------------------------------
 219 /* This sends a 403 Media Failure message to the APT and waits for it
 220    to be ackd */
 221 bool pkgAcqMethod::MediaFail(string Required,string Drive)
 222 {
 223    fprintf(stdout, "403 Media Failure\nMedia: %s\nDrive: %s\n",
 224             Required.c_str(),Drive.c_str());
 225    std::cout << "\n" << std::flush;
 226
 227    vector<string> MyMessages;
 228
 229    /* Here we read messages until we find a 603, each non 603 message is
 230       appended to the main message list for later processing */
 231    while (1)
 232    {
 233       if (WaitFd(STDIN_FILENO) == false)
 234          return false;
 235
 236       if (ReadMessages(STDIN_FILENO,MyMessages) == false)
 237          return false;
 238
 239       string Message = MyMessages.front();
 240       MyMessages.erase(MyMessages.begin());
 241
 242       // Fetch the message number
 243       char *End;
 244       int Number = strtol(Message.c_str(),&End,10);
 245       if (End == Message.c_str())
 246       {
 247          cerr << "Malformed message!" << endl;
 248          exit(100);
 249       }
 250
 251       // Change ack
 252       if (Number == 603)
 253       {
 254          while (MyMessages.empty() == false)
 255          {
 256             Messages.push_back(MyMessages.front());
 257             MyMessages.erase(MyMessages.begin());
 258          }
 259
 260          return !StringToBool(LookupTag(Message,"Failed"),false);
 261       }
 262
 263       Messages.push_back(Message);
 264    }
 265 }
 266                                                                         /*}}}*/
 267 // AcqMethod::Configuration - Handle the configuration message          /*{{{*/
 268 // ---------------------------------------------------------------------
 269 /* This parses each configuration entry and puts it into the _config
 270    Configuration class. */
 271 bool pkgAcqMethod::Configuration(string Message)
 272 {
 273    ::Configuration &Cnf = *_config;
 274
 275    const char *I = Message.c_str();
 276    const char *MsgEnd = I + Message.length();
 277
 278    unsigned int Length = strlen("Config-Item");
 279    for (; I + Length < MsgEnd; I++)
 280    {
 281       // Not a config item
 282       if (I[Length] != ':' || stringcasecmp(I,I+Length,"Config-Item") != 0)
 283          continue;
 284
 285       I += Length + 1;
 286
 287       for (; I < MsgEnd && *I == ' '; I++);
 288       const char *Equals = I;
 289       for (; Equals < MsgEnd && *Equals != '='; Equals++);
 290       const char *End = Equals;
 291       for (; End < MsgEnd && *End != '\n'; End++);
 292       if (End == Equals)
 293          return false;
 294
 295       Cnf.Set(DeQuoteString(string(I,Equals-I)),
 296               DeQuoteString(string(Equals+1,End-Equals-1)));
 297       I = End;
 298    }
 299
 300    return true;
 301 }
 302                                                                         /*}}}*/
 303 // AcqMethod::Run - Run the message engine                              /*{{{*/
 304 // ---------------------------------------------------------------------
 305 /* Fetch any messages and execute them. In single mode it returns 1 if
 306    there are no more available messages - any other result is a
 307    fatal failure code! */
 308 int pkgAcqMethod::Run(bool Single)
 309 {
 310    while (1)
 311    {
 312       // Block if the message queue is empty
 313       if (Messages.empty() == true)
 314       {
 315          if (Single == false)
 316             if (WaitFd(STDIN_FILENO) == false)
 317                break;
 318          if (ReadMessages(STDIN_FILENO,Messages) == false)
 319             break;
 320       }
 321
 322       // Single mode exits if the message queue is empty
 323       if (Single == true && Messages.empty() == true)
 324          return -1;
 325
 326       string Message = Messages.front();
 327       Messages.erase(Messages.begin());
 328
 329       // Fetch the message number
 330       char *End;
 331       int Number = strtol(Message.c_str(),&End,10);
 332       if (End == Message.c_str())
 333       {
 334          cerr << "Malformed message!" << endl;
 335          return 100;
 336       }
 337
 338       switch (Number)
 339       {
 340          case 601:
 341          if (Configuration(Message) == false)
 342             return 100;
 343          break;
 344
 345          case 600:
 346          {
 347             FetchItem *Tmp = new FetchItem;
 348
 349             Tmp->Uri = LookupTag(Message,"URI");
 350             Tmp->DestFile = LookupTag(Message,"FileName");
 351             if (RFC1123StrToTime(LookupTag(Message,"Last-Modified").c_str(),Tmp->LastModified) == false)
 352                Tmp->LastModified = 0;
 353             Tmp->IndexFile = StringToBool(LookupTag(Message,"Index-File"),false);
 354             Tmp->FailIgnore = StringToBool(LookupTag(Message,"Fail-Ignore"),false);
 355             Tmp->Next = 0;
 356
 357             // Append it to the list
 358             FetchItem **I = &Queue;
 359             for (; *I != 0; I = &(*I)->Next);
 360             *I = Tmp;
 361             if (QueueBack == 0)
 362                QueueBack = Tmp;
 363
 364             // Notify that this item is to be fetched.
 365             if (Fetch(Tmp) == false)
 366                Fail();
 367
 368             break;
 369          }
 370       }
 371    }
 372
 373    Exit();
 374    return 0;
 375 }
 376                                                                         /*}}}*/
 377 // AcqMethod::PrintStatus - privately really send a log/status message  /*{{{*/
 378 // ---------------------------------------------------------------------
 379 /* */
 380 void pkgAcqMethod::PrintStatus(char const * const header, const char* Format,
 381                                va_list &args) const
 382 {
 383    string CurrentURI = "<UNKNOWN>";
 384    if (Queue != 0)
 385       CurrentURI = Queue->Uri;
 386    if (UsedMirror.empty() == true)
 387       fprintf(stdout, "%s\nURI: %s\nMessage: ",
 388               header, CurrentURI.c_str());
 389    else
 390       fprintf(stdout, "%s\nURI: %s\nUsedMirror: %s\nMessage: ",
 391               header, CurrentURI.c_str(), UsedMirror.c_str());
 392    vfprintf(stdout,Format,args);
 393    std::cout << "\n\n" << std::flush;
 394 }
 395                                                                         /*}}}*/
 396 // AcqMethod::Log - Send a log message                                  /*{{{*/
 397 // ---------------------------------------------------------------------
 398 /* */
 399 void pkgAcqMethod::Log(const char *Format,...)
 400 {
 401    va_list args;
 402    va_start(args,Format);
 403    PrintStatus("101 Log", Format, args);
 404    va_end(args);
 405 }
 406                                                                         /*}}}*/
 407 // AcqMethod::Status - Send a status message                            /*{{{*/
 408 // ---------------------------------------------------------------------
 409 /* */
 410 void pkgAcqMethod::Status(const char *Format,...)
 411 {
 412    va_list args;
 413    va_start(args,Format);
 414    PrintStatus("102 Status", Format, args);
 415    va_end(args);
 416 }
 417                                                                         /*}}}*/
 418 // AcqMethod::Redirect - Send a redirect message                       /*{{{*/
 419 // ---------------------------------------------------------------------
 420 /* This method sends the redirect message and also manipulates the queue
 421    to keep the pipeline synchronized. */
 422 void pkgAcqMethod::Redirect(const string &NewURI)
 423 {
 424    std::cout << "103 Redirect\nURI: " << Queue->Uri << "\n"
 425              << "New-URI: " << NewURI << "\n"
 426              << "\n" << std::flush;
 427
 428    // Change the URI for the request.
 429    Queue->Uri = NewURI;
 430
 431    /* To keep the pipeline synchronized, move the current request to
 432       the end of the queue, past the end of the current pipeline. */
 433    FetchItem *I;
 434    for (I = Queue; I->Next != 0; I = I->Next) ;
 435    I->Next = Queue;
 436    Queue = Queue->Next;
 437    I->Next->Next = 0;
 438    if (QueueBack == 0)
 439       QueueBack = I->Next;
 440 }
 441                                                                         /*}}}*/
 442 // AcqMethod::FetchResult::FetchResult - Constructor                    /*{{{*/
 443 // ---------------------------------------------------------------------
 444 /* */
 445 pkgAcqMethod::FetchResult::FetchResult() : LastModified(0),
 446                                    IMSHit(false), Size(0), ResumePoint(0)
 447 {
 448 }
 449                                                                         /*}}}*/
 450 // AcqMethod::FetchResult::TakeHashes - Load hashes                     /*{{{*/
 451 // ---------------------------------------------------------------------
 452 /* This hides the number of hashes we are supporting from the caller.
 453    It just deals with the hash class. */
 454 void pkgAcqMethod::FetchResult::TakeHashes(Hashes &Hash)
 455 {
 456    MD5Sum = Hash.MD5.Result();
 457    SHA1Sum = Hash.SHA1.Result();
 458    SHA256Sum = Hash.SHA256.Result();
 459 }
 460                                                                         /*}}}*/