ftparchive/cachedb.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: cachedb.cc,v 1.7 2004/05/08 19:41:01 mdz Exp $
   4 /* ######################################################################
   5
   6    CacheDB
   7
   8    Simple uniform interface to a cache database.
   9
  10    ##################################################################### */
  11                                                                         /*}}}*/
  12 // Include Files                                                        /*{{{*/
  13 #include <config.h>
  14
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/md5.h>
  17 #include <apt-pkg/sha1.h>
  18 #include <apt-pkg/sha2.h>
  19 #include <apt-pkg/strutl.h>
  20 #include <apt-pkg/configuration.h>
  21 #include <apt-pkg/fileutl.h>
  22 #include <apt-pkg/debfile.h>
  23 #include <apt-pkg/gpgv.h>
  24
  25 #include <netinet/in.h>       // htonl, etc
  26 #include <ctype.h>
  27 #include <stddef.h>
  28 #include <sys/stat.h>
  29
  30 #include "cachedb.h"
  31
  32 #include <apti18n.h>
  33                                                                         /*}}}*/
  34
  35 CacheDB::CacheDB(std::string const &DB)
  36    : Dbp(0), Fd(NULL), DebFile(0)
  37 {
  38    TmpKey[0]='\0';
  39    ReadyDB(DB);
  40 };
  41
  42 CacheDB::~CacheDB()
  43 {
  44    ReadyDB();
  45    delete DebFile;
  46 };
  47
  48 // CacheDB::ReadyDB - Ready the DB2                                     /*{{{*/
  49 // ---------------------------------------------------------------------
  50 /* This opens the DB2 file for caching package information */
  51 bool CacheDB::ReadyDB(std::string const &DB)
  52 {
  53    int err;
  54
  55    ReadOnly = _config->FindB("APT::FTPArchive::ReadOnlyDB",false);
  56
  57    // Close the old DB
  58    if (Dbp != 0)
  59       Dbp->close(Dbp,0);
  60
  61    /* Check if the DB was disabled while running and deal with a
  62       corrupted DB */
  63    if (DBFailed() == true)
  64    {
  65       _error->Warning(_("DB was corrupted, file renamed to %s.old"),DBFile.c_str());
  66       rename(DBFile.c_str(),(DBFile+".old").c_str());
  67    }
  68
  69    DBLoaded = false;
  70    Dbp = 0;
  71    DBFile = std::string();
  72
  73    if (DB.empty())
  74       return true;
  75
  76    db_create(&Dbp, NULL, 0);
  77    if ((err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_BTREE,
  78                         (ReadOnly?DB_RDONLY:DB_CREATE),
  79                         0644)) != 0)
  80    {
  81       if (err == DB_OLD_VERSION)
  82       {
  83           _error->Warning(_("DB is old, attempting to upgrade %s"),DBFile.c_str());
  84           err = Dbp->upgrade(Dbp, DB.c_str(), 0);
  85           if (!err)
  86              err = Dbp->open(Dbp, NULL, DB.c_str(), NULL, DB_HASH,
  87                             (ReadOnly?DB_RDONLY:DB_CREATE), 0644);
  88
  89       }
  90       // the database format has changed from DB_HASH to DB_BTREE in
  91       // apt 0.6.44
  92       if (err == EINVAL)
  93       {
  94          _error->Error(_("DB format is invalid. If you upgraded from an older version of apt, please remove and re-create the database."));
  95       }
  96       if (err)
  97       {
  98           Dbp = 0;
  99           return _error->Error(_("Unable to open DB file %s: %s"),DB.c_str(), db_strerror(err));
 100       }
 101    }
 102
 103    DBFile = DB;
 104    DBLoaded = true;
 105    return true;
 106 }
 107                                                                         /*}}}*/
 108 // CacheDB::OpenFile - Open the file                                    /*{{{*/
 109 // ---------------------------------------------------------------------
 110 /* */
 111 bool CacheDB::OpenFile()
 112 {
 113    // always close existing file first
 114    CloseFile();
 115
 116    // open a new file
 117    Fd = new FileFd(FileName,FileFd::ReadOnly);
 118    if (_error->PendingError() == true)
 119    {
 120       CloseFile();
 121       return false;
 122    }
 123    return true;
 124 }
 125                                                                         /*}}}*/
 126 // CacheDB::CloseFile - Close the file                                  /*{{{*/
 127 void CacheDB::CloseFile()
 128 {
 129    if(Fd != NULL)
 130    {
 131       delete Fd;
 132       Fd = NULL;
 133    }
 134 }
 135                                                                         /*}}}*/
 136 // CacheDB::OpenDebFile - Open a debfile                                /*{{{*/
 137 bool CacheDB::OpenDebFile()
 138 {
 139    // always close existing file first
 140    CloseDebFile();
 141
 142    // first open the fd, then pass it to the debDebFile
 143    if(OpenFile() == false)
 144       return false;
 145    DebFile = new debDebFile(*Fd);
 146    if (_error->PendingError() == true)
 147       return false;
 148    return true;
 149 }
 150                                                                         /*}}}*/
 151 // CacheDB::CloseDebFile - Close a debfile again                        /*{{{*/
 152 void CacheDB::CloseDebFile()
 153 {
 154    CloseFile();
 155
 156    if(DebFile != NULL)
 157    {
 158       delete DebFile;
 159       DebFile = NULL;
 160    }
 161 }
 162                                                                         /*}}}*/
 163 // CacheDB::GetFileStat - Get stats from the file                       /*{{{*/
 164 // ---------------------------------------------------------------------
 165 /* This gets the size from the database if it's there.  If we need
 166  * to look at the file, also get the mtime from the file. */
 167 bool CacheDB::GetFileStat(bool const &doStat)
 168 {
 169    if ((CurStat.Flags & FlSize) == FlSize && doStat == false)
 170       return true;
 171
 172    /* Get it from the file. */
 173    if (OpenFile() == false)
 174       return false;
 175
 176    // Stat the file
 177    struct stat St;
 178    if (fstat(Fd->Fd(),&St) != 0)
 179    {
 180       CloseFile();
 181       return _error->Errno("fstat",
 182                            _("Failed to stat %s"),FileName.c_str());
 183    }
 184    CurStat.FileSize = St.st_size;
 185    CurStat.mtime = htonl(St.st_mtime);
 186    CurStat.Flags |= FlSize;
 187
 188    return true;
 189 }
 190                                                                         /*}}}*/
 191 // CacheDB::GetCurStatCompatOldFormat                                   /*{{{*/
 192 // ---------------------------------------------------------------------
 193 /* Read the old (32bit FileSize) StateStore format from disk */
 194 bool CacheDB::GetCurStatCompatOldFormat()
 195 {
 196    InitQueryStats();
 197    Data.data = &CurStatOldFormat;
 198    Data.flags = DB_DBT_USERMEM;
 199    Data.ulen = sizeof(CurStatOldFormat);
 200    if (Get() == false)
 201    {
 202       CurStat.Flags = 0;
 203    } else {
 204       CurStat.Flags = CurStatOldFormat.Flags;
 205       CurStat.mtime = CurStatOldFormat.mtime;
 206       CurStat.FileSize = CurStatOldFormat.FileSize;
 207       memcpy(CurStat.MD5, CurStatOldFormat.MD5, sizeof(CurStat.MD5));
 208       memcpy(CurStat.SHA1, CurStatOldFormat.SHA1, sizeof(CurStat.SHA1));
 209       memcpy(CurStat.SHA256, CurStatOldFormat.SHA256, sizeof(CurStat.SHA256));
 210    }
 211    return true;
 212 }
 213                                                                         /*}}}*/
 214 // CacheDB::GetCurStatCompatOldFormat                                   /*{{{*/
 215 // ---------------------------------------------------------------------
 216 /* Read the new (64bit FileSize) StateStore format from disk */
 217 bool CacheDB::GetCurStatCompatNewFormat()
 218 {
 219    InitQueryStats();
 220    Data.data = &CurStat;
 221    Data.flags = DB_DBT_USERMEM;
 222    Data.ulen = sizeof(CurStat);
 223    if (Get() == false)
 224    {
 225       CurStat.Flags = 0;
 226    }
 227    return true;
 228 }
 229                                                                         /*}}}*/
 230 // CacheDB::GetCurStat - Set the CurStat variable.                      /*{{{*/
 231 // ---------------------------------------------------------------------
 232 /* Sets the CurStat variable.  Either to 0 if no database is used
 233  * or to the value in the database if one is used */
 234 bool CacheDB::GetCurStat()
 235 {
 236    memset(&CurStat,0,sizeof(CurStat));
 237
 238    if (DBLoaded)
 239    {
 240       // do a first query to just get the size of the data on disk
 241       InitQueryStats();
 242       Data.data = &CurStat;
 243       Data.flags = DB_DBT_USERMEM;
 244       Data.ulen = 0;
 245       Get();
 246
 247       if (Data.size == 0)
 248       {
 249          // nothing needs to be done, we just have not data for this deb
 250       }
 251       // check if the record is written in the old format (32bit filesize)
 252       else if(Data.size == sizeof(CurStatOldFormat))
 253       {
 254          GetCurStatCompatOldFormat();
 255       }
 256       else if(Data.size == sizeof(CurStat))
 257       {
 258          GetCurStatCompatNewFormat();
 259       } else {
 260          return _error->Error("Cache record size mismatch (%ul)", Data.size);
 261       }
 262
 263       CurStat.Flags = ntohl(CurStat.Flags);
 264       CurStat.FileSize = ntohl(CurStat.FileSize);
 265    }
 266    return true;
 267 }
 268                                                                         /*}}}*/
 269 // CacheDB::GetFileInfo - Get all the info about the file               /*{{{*/
 270 // ---------------------------------------------------------------------
 271 bool CacheDB::GetFileInfo(std::string const &FileName, bool const &DoControl,
 272                           bool const &DoContents,
 273                           bool const &GenContentsOnly,
 274                           bool const &DoSource,
 275                           bool const &DoMD5, bool const &DoSHA1,
 276                           bool const &DoSHA256, bool const &DoSHA512,
 277                           bool const &checkMtime)
 278 {
 279    bool result = true;
 280    this->FileName = FileName;
 281
 282    if (GetCurStat() == false)
 283       return false;
 284    OldStat = CurStat;
 285
 286    if (GetFileStat(checkMtime) == false)
 287       return false;
 288
 289    /* if mtime changed, update CurStat from disk */
 290    if (checkMtime == true && OldStat.mtime != CurStat.mtime)
 291       CurStat.Flags = FlSize;
 292
 293    Stats.Bytes += CurStat.FileSize;
 294    Stats.Packages++;
 295
 296    if ((DoControl && LoadControl() == false)
 297        || (DoContents && LoadContents(GenContentsOnly) == false)
 298        || (DoSource && LoadSource() == false)
 299        || (DoMD5 && GetMD5(false) == false)
 300        || (DoSHA1 && GetSHA1(false) == false)
 301        || (DoSHA256 && GetSHA256(false) == false)
 302        || (DoSHA512 && GetSHA512(false) == false) )
 303    {
 304       result = false;
 305    }
 306
 307    return result;
 308 }
 309                                                                         /*}}}*/
 310
 311 bool CacheDB::LoadSource()
 312 {
 313    // Try to read the control information out of the DB.
 314    if ((CurStat.Flags & FlSource) == FlSource)
 315    {
 316       // Lookup the control information
 317       InitQuerySource();
 318       if (Get() == true && Dsc.TakeDsc(Data.data, Data.size) == true)
 319       {
 320             return true;
 321       }
 322       CurStat.Flags &= ~FlSource;
 323    }
 324    if (OpenFile() == false)
 325       return false;
 326
 327    Stats.Misses++;
 328    if (Dsc.Read(FileName) == false)
 329       return false;
 330
 331    if (Dsc.Data == 0)
 332       return _error->Error(_("Failed to read .dsc"));
 333
 334    // Write back the control information
 335    InitQuerySource();
 336    if (Put(Dsc.Data, Dsc.Length) == true)
 337       CurStat.Flags |= FlSource;
 338
 339    return true;
 340 }
 341
 342 // CacheDB::LoadControl - Load Control information                      /*{{{*/
 343 // ---------------------------------------------------------------------
 344 /* */
 345 bool CacheDB::LoadControl()
 346 {
 347    // Try to read the control information out of the DB.
 348    if ((CurStat.Flags & FlControl) == FlControl)
 349    {
 350       // Lookup the control information
 351       InitQueryControl();
 352       if (Get() == true && Control.TakeControl(Data.data,Data.size) == true)
 353             return true;
 354       CurStat.Flags &= ~FlControl;
 355    }
 356
 357    if(OpenDebFile() == false)
 358       return false;
 359
 360    Stats.Misses++;
 361    if (Control.Read(*DebFile) == false)
 362       return false;
 363
 364    if (Control.Control == 0)
 365       return _error->Error(_("Archive has no control record"));
 366
 367    // Write back the control information
 368    InitQueryControl();
 369    if (Put(Control.Control,Control.Length) == true)
 370       CurStat.Flags |= FlControl;
 371    return true;
 372 }
 373                                                                         /*}}}*/
 374 // CacheDB::LoadContents - Load the File Listing                        /*{{{*/
 375 // ---------------------------------------------------------------------
 376 /* */
 377 bool CacheDB::LoadContents(bool const &GenOnly)
 378 {
 379    // Try to read the control information out of the DB.
 380    if ((CurStat.Flags & FlContents) == FlContents)
 381    {
 382       if (GenOnly == true)
 383          return true;
 384
 385       // Lookup the contents information
 386       InitQueryContent();
 387       if (Get() == true)
 388       {
 389          if (Contents.TakeContents(Data.data,Data.size) == true)
 390             return true;
 391       }
 392
 393       CurStat.Flags &= ~FlContents;
 394    }
 395
 396    if(OpenDebFile() == false)
 397       return false;
 398
 399    Stats.Misses++;
 400    if (Contents.Read(*DebFile) == false)
 401       return false;
 402
 403    // Write back the control information
 404    InitQueryContent();
 405    if (Put(Contents.Data,Contents.CurSize) == true)
 406       CurStat.Flags |= FlContents;
 407    return true;
 408 }
 409                                                                         /*}}}*/
 410
 411 static std::string bytes2hex(uint8_t *bytes, size_t length) {
 412    char buf[3];
 413    std::string space;
 414
 415    space.reserve(length*2 + 1);
 416    for (size_t i = 0; i < length; i++) {
 417       snprintf(buf, sizeof(buf), "%02x", bytes[i]);
 418       space.append(buf);
 419    }
 420    return space;
 421 }
 422
 423 static inline unsigned char xdig2num(char const &dig) {
 424    if (isdigit(dig)) return dig - '0';
 425    if ('a' <= dig && dig <= 'f') return dig - 'a' + 10;
 426    if ('A' <= dig && dig <= 'F') return dig - 'A' + 10;
 427    return 0;
 428 }
 429
 430 static void hex2bytes(uint8_t *bytes, const char *hex, int length) {
 431    while (length-- > 0) {
 432       *bytes = 0;
 433       if (isxdigit(hex[0]) && isxdigit(hex[1])) {
 434           *bytes = xdig2num(hex[0]) * 16 + xdig2num(hex[1]);
 435           hex += 2;
 436       }
 437       bytes++;
 438    }
 439 }
 440
 441 // CacheDB::GetMD5 - Get the MD5 hash                                   /*{{{*/
 442 // ---------------------------------------------------------------------
 443 /* */
 444 bool CacheDB::GetMD5(bool const &GenOnly)
 445 {
 446    // Try to read the control information out of the DB.
 447    if ((CurStat.Flags & FlMD5) == FlMD5)
 448    {
 449       if (GenOnly == true)
 450          return true;
 451
 452       MD5Res = bytes2hex(CurStat.MD5, sizeof(CurStat.MD5));
 453          return true;
 454    }
 455
 456    Stats.MD5Bytes += CurStat.FileSize;
 457
 458    if (OpenFile() == false)
 459       return false;
 460
 461    MD5Summation MD5;
 462    if (Fd->Seek(0) == false || MD5.AddFD(*Fd, CurStat.FileSize) == false)
 463       return false;
 464
 465    MD5Res = MD5.Result();
 466    hex2bytes(CurStat.MD5, MD5Res.data(), sizeof(CurStat.MD5));
 467       CurStat.Flags |= FlMD5;
 468    return true;
 469 }
 470                                                                         /*}}}*/
 471 // CacheDB::GetSHA1 - Get the SHA1 hash                                 /*{{{*/
 472 // ---------------------------------------------------------------------
 473 /* */
 474 bool CacheDB::GetSHA1(bool const &GenOnly)
 475 {
 476    // Try to read the control information out of the DB.
 477    if ((CurStat.Flags & FlSHA1) == FlSHA1)
 478    {
 479       if (GenOnly == true)
 480          return true;
 481
 482       SHA1Res = bytes2hex(CurStat.SHA1, sizeof(CurStat.SHA1));
 483       return true;
 484    }
 485
 486    Stats.SHA1Bytes += CurStat.FileSize;
 487
 488    if (OpenFile() == false)
 489       return false;
 490
 491    SHA1Summation SHA1;
 492    if (Fd->Seek(0) == false || SHA1.AddFD(*Fd, CurStat.FileSize) == false)
 493       return false;
 494
 495    SHA1Res = SHA1.Result();
 496    hex2bytes(CurStat.SHA1, SHA1Res.data(), sizeof(CurStat.SHA1));
 497    CurStat.Flags |= FlSHA1;
 498    return true;
 499 }
 500                                                                         /*}}}*/
 501 // CacheDB::GetSHA256 - Get the SHA256 hash                             /*{{{*/
 502 // ---------------------------------------------------------------------
 503 /* */
 504 bool CacheDB::GetSHA256(bool const &GenOnly)
 505 {
 506    // Try to read the control information out of the DB.
 507    if ((CurStat.Flags & FlSHA256) == FlSHA256)
 508    {
 509       if (GenOnly == true)
 510          return true;
 511
 512       SHA256Res = bytes2hex(CurStat.SHA256, sizeof(CurStat.SHA256));
 513       return true;
 514    }
 515
 516    Stats.SHA256Bytes += CurStat.FileSize;
 517
 518    if (OpenFile() == false)
 519       return false;
 520
 521    SHA256Summation SHA256;
 522    if (Fd->Seek(0) == false || SHA256.AddFD(*Fd, CurStat.FileSize) == false)
 523       return false;
 524
 525    SHA256Res = SHA256.Result();
 526    hex2bytes(CurStat.SHA256, SHA256Res.data(), sizeof(CurStat.SHA256));
 527    CurStat.Flags |= FlSHA256;
 528    return true;
 529 }
 530                                                                         /*}}}*/
 531 // CacheDB::GetSHA256 - Get the SHA256 hash                             /*{{{*/
 532 // ---------------------------------------------------------------------
 533 /* */
 534 bool CacheDB::GetSHA512(bool const &GenOnly)
 535 {
 536    // Try to read the control information out of the DB.
 537    if ((CurStat.Flags & FlSHA512) == FlSHA512)
 538    {
 539       if (GenOnly == true)
 540          return true;
 541
 542       SHA512Res = bytes2hex(CurStat.SHA512, sizeof(CurStat.SHA512));
 543       return true;
 544    }
 545
 546    Stats.SHA512Bytes += CurStat.FileSize;
 547
 548    if (OpenFile() == false)
 549       return false;
 550
 551    SHA512Summation SHA512;
 552    if (Fd->Seek(0) == false || SHA512.AddFD(*Fd, CurStat.FileSize) == false)
 553       return false;
 554
 555    SHA512Res = SHA512.Result();
 556    hex2bytes(CurStat.SHA512, SHA512Res.data(), sizeof(CurStat.SHA512));
 557    CurStat.Flags |= FlSHA512;
 558    return true;
 559 }
 560                                                                         /*}}}*/
 561 // CacheDB::Finish - Write back the cache structure                     /*{{{*/
 562 // ---------------------------------------------------------------------
 563 /* */
 564 bool CacheDB::Finish()
 565 {
 566    // Optimize away some writes.
 567    if (CurStat.Flags == OldStat.Flags &&
 568        CurStat.mtime == OldStat.mtime)
 569       return true;
 570
 571    // Write the stat information
 572    CurStat.Flags = htonl(CurStat.Flags);
 573    CurStat.FileSize = htonl(CurStat.FileSize);
 574    InitQueryStats();
 575    Put(&CurStat,sizeof(CurStat));
 576    CurStat.Flags = ntohl(CurStat.Flags);
 577    CurStat.FileSize = ntohl(CurStat.FileSize);
 578
 579    return true;
 580 }
 581                                                                         /*}}}*/
 582 // CacheDB::Clean - Clean the Database                                  /*{{{*/
 583 // ---------------------------------------------------------------------
 584 /* Tidy the database by removing files that no longer exist at all. */
 585 bool CacheDB::Clean()
 586 {
 587    if (DBLoaded == false)
 588       return true;
 589
 590    /* I'm not sure what VERSION_MINOR should be here.. 2.4.14 certainly
 591       needs the lower one and 2.7.7 needs the upper.. */
 592    DBC *Cursor;
 593    if ((errno = Dbp->cursor(Dbp, NULL, &Cursor, 0)) != 0)
 594       return _error->Error(_("Unable to get a cursor"));
 595
 596    DBT Key;
 597    DBT Data;
 598    memset(&Key,0,sizeof(Key));
 599    memset(&Data,0,sizeof(Data));
 600    while ((errno = Cursor->c_get(Cursor,&Key,&Data,DB_NEXT)) == 0)
 601    {
 602       const char *Colon = (char*)memrchr(Key.data, ':', Key.size);
 603       if (Colon)
 604       {
 605          if (stringcmp(Colon + 1, (char *)Key.data+Key.size,"st") == 0 ||
 606              stringcmp(Colon + 1, (char *)Key.data+Key.size,"cl") == 0 ||
 607              stringcmp(Colon + 1, (char *)Key.data+Key.size,"cs") == 0 ||
 608              stringcmp(Colon + 1, (char *)Key.data+Key.size,"cn") == 0)
 609          {
 610             std::string FileName = std::string((const char *)Key.data,Colon);
 611             if (FileExists(FileName) == true) {
 612                 continue;
 613             }
 614          }
 615       }
 616       Cursor->c_del(Cursor,0);
 617    }
 618    int res = Dbp->compact(Dbp, NULL, NULL, NULL, NULL, DB_FREE_SPACE, NULL);
 619    if (res < 0)
 620       _error->Warning("compact failed with result %i", res);
 621
 622    if(_config->FindB("Debug::APT::FTPArchive::Clean", false) == true)
 623       Dbp->stat_print(Dbp, 0);
 624
 625
 626    return true;
 627 }
 628                                                                         /*}}}*/