apt-pkg/contrib/fileutl.cc

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: fileutl.cc,v 1.42 2002/09/14 05:29:22 jgg Exp $
   4 /* ######################################################################
   5
   6    File Utilities
   7
   8    CopyFile - Buffered copy of a single file
   9    GetLock - dpkg compatible lock file manipulation (fcntl)
  10
  11    Most of this source is placed in the Public Domain, do with it what
  12    you will
  13    It was originally written by Jason Gunthorpe <jgg@debian.org>.
  14    FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com>
  15
  16    The exception is RunScripts() it is under the GPLv2
  17
  18    ##################################################################### */
  19                                                                         /*}}}*/
  20 // Include Files                                                        /*{{{*/
  21 #include <config.h>
  22
  23 #include <apt-pkg/fileutl.h>
  24 #include <apt-pkg/strutl.h>
  25 #include <apt-pkg/error.h>
  26 #include <apt-pkg/sptr.h>
  27 #include <apt-pkg/aptconfiguration.h>
  28 #include <apt-pkg/configuration.h>
  29
  30 #include <cstdlib>
  31 #include <cstring>
  32 #include <cstdio>
  33
  34 #include <iostream>
  35 #include <unistd.h>
  36 #include <fcntl.h>
  37 #include <sys/stat.h>
  38 #include <sys/types.h>
  39 #include <sys/time.h>
  40 #include <sys/wait.h>
  41 #include <dirent.h>
  42 #include <signal.h>
  43 #include <errno.h>
  44 #include <glob.h>
  45
  46 #include <set>
  47 #include <algorithm>
  48
  49 #ifdef HAVE_ZLIB
  50         #include <zlib.h>
  51 #endif
  52 #ifdef HAVE_BZ2
  53         #include <bzlib.h>
  54 #endif
  55
  56 #ifdef WORDS_BIGENDIAN
  57 #include <inttypes.h>
  58 #endif
  59
  60 #include <apti18n.h>
  61                                                                         /*}}}*/
  62
  63 using namespace std;
  64
  65 class FileFdPrivate {
  66         public:
  67 #ifdef HAVE_ZLIB
  68         gzFile gz;
  69 #else
  70         void* gz;
  71 #endif
  72 #ifdef HAVE_BZ2
  73         BZFILE* bz2;
  74 #else
  75         void* bz2;
  76 #endif
  77         int compressed_fd;
  78         pid_t compressor_pid;
  79         bool pipe;
  80         APT::Configuration::Compressor compressor;
  81         unsigned int openmode;
  82         unsigned long long seekpos;
  83         FileFdPrivate() : gz(NULL), bz2(NULL),
  84                           compressed_fd(-1), compressor_pid(-1), pipe(false),
  85                           openmode(0), seekpos(0) {};
  86         bool CloseDown(std::string const &FileName)
  87         {
  88            bool Res = true;
  89 #ifdef HAVE_ZLIB
  90            if (gz != NULL) {
  91               int const e = gzclose(gz);
  92               gz = NULL;
  93               // gzdclose() on empty files always fails with "buffer error" here, ignore that
  94               if (e != 0 && e != Z_BUF_ERROR)
  95                  Res &= _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
  96            }
  97 #endif
  98 #ifdef HAVE_BZ2
  99            if (bz2 != NULL) {
 100               BZ2_bzclose(bz2);
 101               bz2 = NULL;
 102            }
 103 #endif
 104            if (compressor_pid > 0)
 105               ExecWait(compressor_pid, "FileFdCompressor", true);
 106            compressor_pid = -1;
 107
 108            return Res;
 109         }
 110         ~FileFdPrivate() { CloseDown(""); }
 111 };
 112
 113 // RunScripts - Run a set of scripts from a configuration subtree       /*{{{*/
 114 // ---------------------------------------------------------------------
 115 /* */
 116 bool RunScripts(const char *Cnf)
 117 {
 118    Configuration::Item const *Opts = _config->Tree(Cnf);
 119    if (Opts == 0 || Opts->Child == 0)
 120       return true;
 121    Opts = Opts->Child;
 122
 123    // Fork for running the system calls
 124    pid_t Child = ExecFork();
 125
 126    // This is the child
 127    if (Child == 0)
 128    {
 129       if (_config->FindDir("DPkg::Chroot-Directory","/") != "/")
 130       {
 131          std::cerr << "Chrooting into "
 132                    << _config->FindDir("DPkg::Chroot-Directory")
 133                    << std::endl;
 134          if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0)
 135             _exit(100);
 136       }
 137
 138       if (chdir("/tmp/") != 0)
 139          _exit(100);
 140
 141       unsigned int Count = 1;
 142       for (; Opts != 0; Opts = Opts->Next, Count++)
 143       {
 144          if (Opts->Value.empty() == true)
 145             continue;
 146
 147          if (system(Opts->Value.c_str()) != 0)
 148             _exit(100+Count);
 149       }
 150       _exit(0);
 151    }
 152
 153    // Wait for the child
 154    int Status = 0;
 155    while (waitpid(Child,&Status,0) != Child)
 156    {
 157       if (errno == EINTR)
 158          continue;
 159       return _error->Errno("waitpid","Couldn't wait for subprocess");
 160    }
 161
 162    // Restore sig int/quit
 163    signal(SIGQUIT,SIG_DFL);
 164    signal(SIGINT,SIG_DFL);
 165
 166    // Check for an error code.
 167    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 168    {
 169       unsigned int Count = WEXITSTATUS(Status);
 170       if (Count > 100)
 171       {
 172          Count -= 100;
 173          for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--);
 174          _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str());
 175       }
 176
 177       return _error->Error("Sub-process returned an error code");
 178    }
 179
 180    return true;
 181 }
 182                                                                         /*}}}*/
 183
 184 // CopyFile - Buffered copy of a file                                   /*{{{*/
 185 // ---------------------------------------------------------------------
 186 /* The caller is expected to set things so that failure causes erasure */
 187 bool CopyFile(FileFd &From,FileFd &To)
 188 {
 189    if (From.IsOpen() == false || To.IsOpen() == false ||
 190          From.Failed() == true || To.Failed() == true)
 191       return false;
 192
 193    // Buffered copy between fds
 194    SPtrArray<unsigned char> Buf = new unsigned char[64000];
 195    unsigned long long Size = From.Size();
 196    while (Size != 0)
 197    {
 198       unsigned long long ToRead = Size;
 199       if (Size > 64000)
 200          ToRead = 64000;
 201
 202       if (From.Read(Buf,ToRead) == false ||
 203           To.Write(Buf,ToRead) == false)
 204          return false;
 205
 206       Size -= ToRead;
 207    }
 208
 209    return true;
 210 }
 211                                                                         /*}}}*/
 212 // GetLock - Gets a lock file                                           /*{{{*/
 213 // ---------------------------------------------------------------------
 214 /* This will create an empty file of the given name and lock it. Once this
 215    is done all other calls to GetLock in any other process will fail with
 216    -1. The return result is the fd of the file, the call should call
 217    close at some time. */
 218 int GetLock(string File,bool Errors)
 219 {
 220    // GetLock() is used in aptitude on directories with public-write access
 221    // Use O_NOFOLLOW here to prevent symlink traversal attacks
 222    int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640);
 223    if (FD < 0)
 224    {
 225       // Read only .. cant have locking problems there.
 226       if (errno == EROFS)
 227       {
 228          _error->Warning(_("Not using locking for read only lock file %s"),File.c_str());
 229          return dup(0);       // Need something for the caller to close
 230       }
 231
 232       if (Errors == true)
 233          _error->Errno("open",_("Could not open lock file %s"),File.c_str());
 234
 235       // Feh.. We do this to distinguish the lock vs open case..
 236       errno = EPERM;
 237       return -1;
 238    }
 239    SetCloseExec(FD,true);
 240
 241    // Aquire a write lock
 242    struct flock fl;
 243    fl.l_type = F_WRLCK;
 244    fl.l_whence = SEEK_SET;
 245    fl.l_start = 0;
 246    fl.l_len = 0;
 247    if (fcntl(FD,F_SETLK,&fl) == -1)
 248    {
 249       // always close to not leak resources
 250       int Tmp = errno;
 251       close(FD);
 252       errno = Tmp;
 253
 254       if (errno == ENOLCK)
 255       {
 256          _error->Warning(_("Not using locking for nfs mounted lock file %s"),File.c_str());
 257          return dup(0);       // Need something for the caller to close
 258       }
 259
 260       if (Errors == true)
 261          _error->Errno("open",_("Could not get lock %s"),File.c_str());
 262
 263       return -1;
 264    }
 265
 266    return FD;
 267 }
 268                                                                         /*}}}*/
 269 // FileExists - Check if a file exists                                  /*{{{*/
 270 // ---------------------------------------------------------------------
 271 /* Beware: Directories are also files! */
 272 bool FileExists(string File)
 273 {
 274    struct stat Buf;
 275    if (stat(File.c_str(),&Buf) != 0)
 276       return false;
 277    return true;
 278 }
 279                                                                         /*}}}*/
 280 // RealFileExists - Check if a file exists and if it is really a file   /*{{{*/
 281 // ---------------------------------------------------------------------
 282 /* */
 283 bool RealFileExists(string File)
 284 {
 285    struct stat Buf;
 286    if (stat(File.c_str(),&Buf) != 0)
 287       return false;
 288    return ((Buf.st_mode & S_IFREG) != 0);
 289 }
 290                                                                         /*}}}*/
 291 // DirectoryExists - Check if a directory exists and is really one      /*{{{*/
 292 // ---------------------------------------------------------------------
 293 /* */
 294 bool DirectoryExists(string const &Path)
 295 {
 296    struct stat Buf;
 297    if (stat(Path.c_str(),&Buf) != 0)
 298       return false;
 299    return ((Buf.st_mode & S_IFDIR) != 0);
 300 }
 301                                                                         /*}}}*/
 302 // CreateDirectory - poor man's mkdir -p guarded by a parent directory  /*{{{*/
 303 // ---------------------------------------------------------------------
 304 /* This method will create all directories needed for path in good old
 305    mkdir -p style but refuses to do this if Parent is not a prefix of
 306    this Path. Example: /var/cache/ and /var/cache/apt/archives are given,
 307    so it will create apt/archives if /var/cache exists - on the other
 308    hand if the parent is /var/lib the creation will fail as this path
 309    is not a parent of the path to be generated. */
 310 bool CreateDirectory(string const &Parent, string const &Path)
 311 {
 312    if (Parent.empty() == true || Path.empty() == true)
 313       return false;
 314
 315    if (DirectoryExists(Path) == true)
 316       return true;
 317
 318    if (DirectoryExists(Parent) == false)
 319       return false;
 320
 321    // we are not going to create directories "into the blue"
 322    if (Path.find(Parent, 0) != 0)
 323       return false;
 324
 325    vector<string> const dirs = VectorizeString(Path.substr(Parent.size()), '/');
 326    string progress = Parent;
 327    for (vector<string>::const_iterator d = dirs.begin(); d != dirs.end(); ++d)
 328    {
 329       if (d->empty() == true)
 330          continue;
 331
 332       progress.append("/").append(*d);
 333       if (DirectoryExists(progress) == true)
 334          continue;
 335
 336       if (mkdir(progress.c_str(), 0755) != 0)
 337          return false;
 338    }
 339    return true;
 340 }
 341                                                                         /*}}}*/
 342 // CreateAPTDirectoryIfNeeded - ensure that the given directory exists          /*{{{*/
 343 // ---------------------------------------------------------------------
 344 /* a small wrapper around CreateDirectory to check if it exists and to
 345    remove the trailing "/apt/" from the parent directory if needed */
 346 bool CreateAPTDirectoryIfNeeded(string const &Parent, string const &Path)
 347 {
 348    if (DirectoryExists(Path) == true)
 349       return true;
 350
 351    size_t const len = Parent.size();
 352    if (len > 5 && Parent.find("/apt/", len - 6, 5) == len - 5)
 353    {
 354       if (CreateDirectory(Parent.substr(0,len-5), Path) == true)
 355          return true;
 356    }
 357    else if (CreateDirectory(Parent, Path) == true)
 358       return true;
 359
 360    return false;
 361 }
 362                                                                         /*}}}*/
 363 // GetListOfFilesInDir - returns a vector of files in the given dir     /*{{{*/
 364 // ---------------------------------------------------------------------
 365 /* If an extension is given only files with this extension are included
 366    in the returned vector, otherwise every "normal" file is included. */
 367 std::vector<string> GetListOfFilesInDir(string const &Dir, string const &Ext,
 368                                         bool const &SortList, bool const &AllowNoExt)
 369 {
 370    std::vector<string> ext;
 371    ext.reserve(2);
 372    if (Ext.empty() == false)
 373       ext.push_back(Ext);
 374    if (AllowNoExt == true && ext.empty() == false)
 375       ext.push_back("");
 376    return GetListOfFilesInDir(Dir, ext, SortList);
 377 }
 378 std::vector<string> GetListOfFilesInDir(string const &Dir, std::vector<string> const &Ext,
 379                                         bool const &SortList)
 380 {
 381    // Attention debuggers: need to be set with the environment config file!
 382    bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
 383    if (Debug == true)
 384    {
 385       std::clog << "Accept in " << Dir << " only files with the following " << Ext.size() << " extensions:" << std::endl;
 386       if (Ext.empty() == true)
 387          std::clog << "\tNO extension" << std::endl;
 388       else
 389          for (std::vector<string>::const_iterator e = Ext.begin();
 390               e != Ext.end(); ++e)
 391             std::clog << '\t' << (e->empty() == true ? "NO" : *e) << " extension" << std::endl;
 392    }
 393
 394    std::vector<string> List;
 395
 396    if (DirectoryExists(Dir) == false)
 397    {
 398       _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
 399       return List;
 400    }
 401
 402    Configuration::MatchAgainstConfig SilentIgnore("Dir::Ignore-Files-Silently");
 403    DIR *D = opendir(Dir.c_str());
 404    if (D == 0)
 405    {
 406       _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
 407       return List;
 408    }
 409
 410    for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
 411    {
 412       // skip "hidden" files
 413       if (Ent->d_name[0] == '.')
 414          continue;
 415
 416       // Make sure it is a file and not something else
 417       string const File = flCombine(Dir,Ent->d_name);
 418 #ifdef _DIRENT_HAVE_D_TYPE
 419       if (Ent->d_type != DT_REG)
 420 #endif
 421       {
 422          if (RealFileExists(File) == false)
 423          {
 424             // do not show ignoration warnings for directories
 425             if (
 426 #ifdef _DIRENT_HAVE_D_TYPE
 427                 Ent->d_type == DT_DIR ||
 428 #endif
 429                 DirectoryExists(File) == true)
 430                continue;
 431             if (SilentIgnore.Match(Ent->d_name) == false)
 432                _error->Notice(_("Ignoring '%s' in directory '%s' as it is not a regular file"), Ent->d_name, Dir.c_str());
 433             continue;
 434          }
 435       }
 436
 437       // check for accepted extension:
 438       // no extension given -> periods are bad as hell!
 439       // extensions given -> "" extension allows no extension
 440       if (Ext.empty() == false)
 441       {
 442          string d_ext = flExtension(Ent->d_name);
 443          if (d_ext == Ent->d_name) // no extension
 444          {
 445             if (std::find(Ext.begin(), Ext.end(), "") == Ext.end())
 446             {
 447                if (Debug == true)
 448                   std::clog << "Bad file: " << Ent->d_name << " → no extension" << std::endl;
 449                if (SilentIgnore.Match(Ent->d_name) == false)
 450                   _error->Notice(_("Ignoring file '%s' in directory '%s' as it has no filename extension"), Ent->d_name, Dir.c_str());
 451                continue;
 452             }
 453          }
 454          else if (std::find(Ext.begin(), Ext.end(), d_ext) == Ext.end())
 455          {
 456             if (Debug == true)
 457                std::clog << "Bad file: " << Ent->d_name << " → bad extension »" << flExtension(Ent->d_name) << "«" << std::endl;
 458             if (SilentIgnore.Match(Ent->d_name) == false)
 459                _error->Notice(_("Ignoring file '%s' in directory '%s' as it has an invalid filename extension"), Ent->d_name, Dir.c_str());
 460             continue;
 461          }
 462       }
 463
 464       // Skip bad filenames ala run-parts
 465       const char *C = Ent->d_name;
 466       for (; *C != 0; ++C)
 467          if (isalpha(*C) == 0 && isdigit(*C) == 0
 468              && *C != '_' && *C != '-') {
 469             // no required extension -> dot is a bad character
 470             if (*C == '.' && Ext.empty() == false)
 471                continue;
 472             break;
 473          }
 474
 475       // we don't reach the end of the name -> bad character included
 476       if (*C != 0)
 477       {
 478          if (Debug == true)
 479             std::clog << "Bad file: " << Ent->d_name << " → bad character »"
 480                << *C << "« in filename (period allowed: " << (Ext.empty() ? "no" : "yes") << ")" << std::endl;
 481          continue;
 482       }
 483
 484       // skip filenames which end with a period. These are never valid
 485       if (*(C - 1) == '.')
 486       {
 487          if (Debug == true)
 488             std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl;
 489          continue;
 490       }
 491
 492       if (Debug == true)
 493          std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl;
 494       List.push_back(File);
 495    }
 496    closedir(D);
 497
 498    if (SortList == true)
 499       std::sort(List.begin(),List.end());
 500    return List;
 501 }
 502 std::vector<string> GetListOfFilesInDir(string const &Dir, bool SortList)
 503 {
 504    bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false);
 505    if (Debug == true)
 506       std::clog << "Accept in " << Dir << " all regular files" << std::endl;
 507
 508    std::vector<string> List;
 509
 510    if (DirectoryExists(Dir) == false)
 511    {
 512       _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str());
 513       return List;
 514    }
 515
 516    DIR *D = opendir(Dir.c_str());
 517    if (D == 0)
 518    {
 519       _error->Errno("opendir",_("Unable to read %s"),Dir.c_str());
 520       return List;
 521    }
 522
 523    for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D))
 524    {
 525       // skip "hidden" files
 526       if (Ent->d_name[0] == '.')
 527          continue;
 528
 529       // Make sure it is a file and not something else
 530       string const File = flCombine(Dir,Ent->d_name);
 531 #ifdef _DIRENT_HAVE_D_TYPE
 532       if (Ent->d_type != DT_REG)
 533 #endif
 534       {
 535          if (RealFileExists(File) == false)
 536          {
 537             if (Debug == true)
 538                std::clog << "Bad file: " << Ent->d_name << " → it is not a real file" << std::endl;
 539             continue;
 540          }
 541       }
 542
 543       // Skip bad filenames ala run-parts
 544       const char *C = Ent->d_name;
 545       for (; *C != 0; ++C)
 546          if (isalpha(*C) == 0 && isdigit(*C) == 0
 547              && *C != '_' && *C != '-' && *C != '.')
 548             break;
 549
 550       // we don't reach the end of the name -> bad character included
 551       if (*C != 0)
 552       {
 553          if (Debug == true)
 554             std::clog << "Bad file: " << Ent->d_name << " → bad character »" << *C << "« in filename" << std::endl;
 555          continue;
 556       }
 557
 558       // skip filenames which end with a period. These are never valid
 559       if (*(C - 1) == '.')
 560       {
 561          if (Debug == true)
 562             std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl;
 563          continue;
 564       }
 565
 566       if (Debug == true)
 567          std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl;
 568       List.push_back(File);
 569    }
 570    closedir(D);
 571
 572    if (SortList == true)
 573       std::sort(List.begin(),List.end());
 574    return List;
 575 }
 576                                                                         /*}}}*/
 577 // SafeGetCWD - This is a safer getcwd that returns a dynamic string    /*{{{*/
 578 // ---------------------------------------------------------------------
 579 /* We return / on failure. */
 580 string SafeGetCWD()
 581 {
 582    // Stash the current dir.
 583    char S[300];
 584    S[0] = 0;
 585    if (getcwd(S,sizeof(S)-2) == 0)
 586       return "/";
 587    unsigned int Len = strlen(S);
 588    S[Len] = '/';
 589    S[Len+1] = 0;
 590    return S;
 591 }
 592                                                                         /*}}}*/
 593 // GetModificationTime - Get the mtime of the given file or -1 on error /*{{{*/
 594 // ---------------------------------------------------------------------
 595 /* We return / on failure. */
 596 time_t GetModificationTime(string const &Path)
 597 {
 598    struct stat St;
 599    if (stat(Path.c_str(), &St) < 0)
 600       return -1;
 601    return  St.st_mtime;
 602 }
 603                                                                         /*}}}*/
 604 // flNotDir - Strip the directory from the filename                     /*{{{*/
 605 // ---------------------------------------------------------------------
 606 /* */
 607 string flNotDir(string File)
 608 {
 609    string::size_type Res = File.rfind('/');
 610    if (Res == string::npos)
 611       return File;
 612    Res++;
 613    return string(File,Res,Res - File.length());
 614 }
 615                                                                         /*}}}*/
 616 // flNotFile - Strip the file from the directory name                   /*{{{*/
 617 // ---------------------------------------------------------------------
 618 /* Result ends in a / */
 619 string flNotFile(string File)
 620 {
 621    string::size_type Res = File.rfind('/');
 622    if (Res == string::npos)
 623       return "./";
 624    Res++;
 625    return string(File,0,Res);
 626 }
 627                                                                         /*}}}*/
 628 // flExtension - Return the extension for the file                      /*{{{*/
 629 // ---------------------------------------------------------------------
 630 /* */
 631 string flExtension(string File)
 632 {
 633    string::size_type Res = File.rfind('.');
 634    if (Res == string::npos)
 635       return File;
 636    Res++;
 637    return string(File,Res,Res - File.length());
 638 }
 639                                                                         /*}}}*/
 640 // flNoLink - If file is a symlink then deref it                        /*{{{*/
 641 // ---------------------------------------------------------------------
 642 /* If the name is not a link then the returned path is the input. */
 643 string flNoLink(string File)
 644 {
 645    struct stat St;
 646    if (lstat(File.c_str(),&St) != 0 || S_ISLNK(St.st_mode) == 0)
 647       return File;
 648    if (stat(File.c_str(),&St) != 0)
 649       return File;
 650
 651    /* Loop resolving the link. There is no need to limit the number of
 652       loops because the stat call above ensures that the symlink is not
 653       circular */
 654    char Buffer[1024];
 655    string NFile = File;
 656    while (1)
 657    {
 658       // Read the link
 659       int Res;
 660       if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 ||
 661           (unsigned)Res >= sizeof(Buffer))
 662           return File;
 663
 664       // Append or replace the previous path
 665       Buffer[Res] = 0;
 666       if (Buffer[0] == '/')
 667          NFile = Buffer;
 668       else
 669          NFile = flNotFile(NFile) + Buffer;
 670
 671       // See if we are done
 672       if (lstat(NFile.c_str(),&St) != 0)
 673          return File;
 674       if (S_ISLNK(St.st_mode) == 0)
 675          return NFile;
 676    }
 677 }
 678                                                                         /*}}}*/
 679 // flCombine - Combine a file and a directory                           /*{{{*/
 680 // ---------------------------------------------------------------------
 681 /* If the file is an absolute path then it is just returned, otherwise
 682    the directory is pre-pended to it. */
 683 string flCombine(string Dir,string File)
 684 {
 685    if (File.empty() == true)
 686       return string();
 687
 688    if (File[0] == '/' || Dir.empty() == true)
 689       return File;
 690    if (File.length() >= 2 && File[0] == '.' && File[1] == '/')
 691       return File;
 692    if (Dir[Dir.length()-1] == '/')
 693       return Dir + File;
 694    return Dir + '/' + File;
 695 }
 696                                                                         /*}}}*/
 697 // SetCloseExec - Set the close on exec flag                            /*{{{*/
 698 // ---------------------------------------------------------------------
 699 /* */
 700 void SetCloseExec(int Fd,bool Close)
 701 {
 702    if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0)
 703    {
 704       cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl;
 705       exit(100);
 706    }
 707 }
 708                                                                         /*}}}*/
 709 // SetNonBlock - Set the nonblocking flag                               /*{{{*/
 710 // ---------------------------------------------------------------------
 711 /* */
 712 void SetNonBlock(int Fd,bool Block)
 713 {
 714    int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK);
 715    if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0)
 716    {
 717       cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl;
 718       exit(100);
 719    }
 720 }
 721                                                                         /*}}}*/
 722 // WaitFd - Wait for a FD to become readable                            /*{{{*/
 723 // ---------------------------------------------------------------------
 724 /* This waits for a FD to become readable using select. It is useful for
 725    applications making use of non-blocking sockets. The timeout is
 726    in seconds. */
 727 bool WaitFd(int Fd,bool write,unsigned long timeout)
 728 {
 729    fd_set Set;
 730    struct timeval tv;
 731    FD_ZERO(&Set);
 732    FD_SET(Fd,&Set);
 733    tv.tv_sec = timeout;
 734    tv.tv_usec = 0;
 735    if (write == true)
 736    {
 737       int Res;
 738       do
 739       {
 740          Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0));
 741       }
 742       while (Res < 0 && errno == EINTR);
 743
 744       if (Res <= 0)
 745          return false;
 746    }
 747    else
 748    {
 749       int Res;
 750       do
 751       {
 752          Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0));
 753       }
 754       while (Res < 0 && errno == EINTR);
 755
 756       if (Res <= 0)
 757          return false;
 758    }
 759
 760    return true;
 761 }
 762                                                                         /*}}}*/
 763 // ExecFork - Magical fork that sanitizes the context before execing    /*{{{*/
 764 // ---------------------------------------------------------------------
 765 /* This is used if you want to cleanse the environment for the forked
 766    child, it fixes up the important signals and nukes all of the fds,
 767    otherwise acts like normal fork. */
 768 pid_t ExecFork()
 769 {
 770    // Fork off the process
 771    pid_t Process = fork();
 772    if (Process < 0)
 773    {
 774       cerr << "FATAL -> Failed to fork." << endl;
 775       exit(100);
 776    }
 777
 778    // Spawn the subprocess
 779    if (Process == 0)
 780    {
 781       // Setup the signals
 782       signal(SIGPIPE,SIG_DFL);
 783       signal(SIGQUIT,SIG_DFL);
 784       signal(SIGINT,SIG_DFL);
 785       signal(SIGWINCH,SIG_DFL);
 786       signal(SIGCONT,SIG_DFL);
 787       signal(SIGTSTP,SIG_DFL);
 788
 789       set<int> KeepFDs;
 790       Configuration::Item const *Opts = _config->Tree("APT::Keep-Fds");
 791       if (Opts != 0 && Opts->Child != 0)
 792       {
 793          Opts = Opts->Child;
 794          for (; Opts != 0; Opts = Opts->Next)
 795          {
 796             if (Opts->Value.empty() == true)
 797                continue;
 798             int fd = atoi(Opts->Value.c_str());
 799             KeepFDs.insert(fd);
 800          }
 801       }
 802
 803       // Close all of our FDs - just in case
 804       for (int K = 3; K != 40; K++)
 805       {
 806          if(KeepFDs.find(K) == KeepFDs.end())
 807             fcntl(K,F_SETFD,FD_CLOEXEC);
 808       }
 809    }
 810
 811    return Process;
 812 }
 813                                                                         /*}}}*/
 814 // ExecWait - Fancy waitpid                                             /*{{{*/
 815 // ---------------------------------------------------------------------
 816 /* Waits for the given sub process. If Reap is set then no errors are
 817    generated. Otherwise a failed subprocess will generate a proper descriptive
 818    message */
 819 bool ExecWait(pid_t Pid,const char *Name,bool Reap)
 820 {
 821    if (Pid <= 1)
 822       return true;
 823
 824    // Wait and collect the error code
 825    int Status;
 826    while (waitpid(Pid,&Status,0) != Pid)
 827    {
 828       if (errno == EINTR)
 829          continue;
 830
 831       if (Reap == true)
 832          return false;
 833
 834       return _error->Error(_("Waited for %s but it wasn't there"),Name);
 835    }
 836
 837
 838    // Check for an error code.
 839    if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
 840    {
 841       if (Reap == true)
 842          return false;
 843       if (WIFSIGNALED(Status) != 0)
 844       {
 845          if( WTERMSIG(Status) == SIGSEGV)
 846             return _error->Error(_("Sub-process %s received a segmentation fault."),Name);
 847          else
 848             return _error->Error(_("Sub-process %s received signal %u."),Name, WTERMSIG(Status));
 849       }
 850
 851       if (WIFEXITED(Status) != 0)
 852          return _error->Error(_("Sub-process %s returned an error code (%u)"),Name,WEXITSTATUS(Status));
 853
 854       return _error->Error(_("Sub-process %s exited unexpectedly"),Name);
 855    }
 856
 857    return true;
 858 }
 859                                                                         /*}}}*/
 860
 861 // FileFd::Open - Open a file                                           /*{{{*/
 862 // ---------------------------------------------------------------------
 863 /* The most commonly used open mode combinations are given with Mode */
 864 bool FileFd::Open(string FileName,unsigned int const Mode,CompressMode Compress, unsigned long const Perms)
 865 {
 866    if (Mode == ReadOnlyGzip)
 867       return Open(FileName, ReadOnly, Gzip, Perms);
 868
 869    if (Compress == Auto && (Mode & WriteOnly) == WriteOnly)
 870       return FileFdError("Autodetection on %s only works in ReadOnly openmode!", FileName.c_str());
 871
 872    std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
 873    std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
 874    if (Compress == Auto)
 875    {
 876       for (; compressor != compressors.end(); ++compressor)
 877       {
 878          std::string file = std::string(FileName).append(compressor->Extension);
 879          if (FileExists(file) == false)
 880             continue;
 881          FileName = file;
 882          break;
 883       }
 884    }
 885    else if (Compress == Extension)
 886    {
 887       std::string::size_type const found = FileName.find_last_of('.');
 888       std::string ext;
 889       if (found != std::string::npos)
 890       {
 891          ext = FileName.substr(found);
 892          if (ext == ".new" || ext == ".bak")
 893          {
 894             std::string::size_type const found2 = FileName.find_last_of('.', found - 1);
 895             if (found2 != std::string::npos)
 896                ext = FileName.substr(found2, found - found2);
 897             else
 898                ext.clear();
 899          }
 900       }
 901       for (; compressor != compressors.end(); ++compressor)
 902          if (ext == compressor->Extension)
 903             break;
 904       // no matching extension - assume uncompressed (imagine files like 'example.org_Packages')
 905       if (compressor == compressors.end())
 906          for (compressor = compressors.begin(); compressor != compressors.end(); ++compressor)
 907             if (compressor->Name == ".")
 908                break;
 909    }
 910    else
 911    {
 912       std::string name;
 913       switch (Compress)
 914       {
 915       case None: name = "."; break;
 916       case Gzip: name = "gzip"; break;
 917       case Bzip2: name = "bzip2"; break;
 918       case Lzma: name = "lzma"; break;
 919       case Xz: name = "xz"; break;
 920       case Auto:
 921       case Extension:
 922          // Unreachable
 923          return FileFdError("Opening File %s in None, Auto or Extension should be already handled?!?", FileName.c_str());
 924       }
 925       for (; compressor != compressors.end(); ++compressor)
 926          if (compressor->Name == name)
 927             break;
 928       if (compressor == compressors.end())
 929          return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
 930    }
 931
 932    if (compressor == compressors.end())
 933       return FileFdError("Can't find a match for specified compressor mode for file %s", FileName.c_str());
 934    return Open(FileName, Mode, *compressor, Perms);
 935 }
 936 bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor, unsigned long const Perms)
 937 {
 938    Close();
 939    Flags = AutoClose;
 940
 941    if ((Mode & WriteOnly) != WriteOnly && (Mode & (Atomic | Create | Empty | Exclusive)) != 0)
 942       return FileFdError("ReadOnly mode for %s doesn't accept additional flags!", FileName.c_str());
 943    if ((Mode & ReadWrite) == 0)
 944       return FileFdError("No openmode provided in FileFd::Open for %s", FileName.c_str());
 945
 946    if ((Mode & Atomic) == Atomic)
 947    {
 948       Flags |= Replace;
 949       char *name = strdup((FileName + ".XXXXXX").c_str());
 950       TemporaryFileName = string(mktemp(name));
 951       free(name);
 952    }
 953    else if ((Mode & (Exclusive | Create)) == (Exclusive | Create))
 954    {
 955       // for atomic, this will be done by rename in Close()
 956       unlink(FileName.c_str());
 957    }
 958    if ((Mode & Empty) == Empty)
 959    {
 960       struct stat Buf;
 961       if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
 962          unlink(FileName.c_str());
 963    }
 964
 965    int fileflags = 0;
 966    #define if_FLAGGED_SET(FLAG, MODE) if ((Mode & FLAG) == FLAG) fileflags |= MODE
 967    if_FLAGGED_SET(ReadWrite, O_RDWR);
 968    else if_FLAGGED_SET(ReadOnly, O_RDONLY);
 969    else if_FLAGGED_SET(WriteOnly, O_WRONLY);
 970
 971    if_FLAGGED_SET(Create, O_CREAT);
 972    if_FLAGGED_SET(Empty, O_TRUNC);
 973    if_FLAGGED_SET(Exclusive, O_EXCL);
 974    else if_FLAGGED_SET(Atomic, O_EXCL);
 975    #undef if_FLAGGED_SET
 976
 977    if (TemporaryFileName.empty() == false)
 978       iFd = open(TemporaryFileName.c_str(), fileflags, Perms);
 979    else
 980       iFd = open(FileName.c_str(), fileflags, Perms);
 981
 982    this->FileName = FileName;
 983    if (iFd == -1 || OpenInternDescriptor(Mode, compressor) == false)
 984    {
 985       if (iFd != -1)
 986       {
 987          close (iFd);
 988          iFd = -1;
 989       }
 990       return FileFdErrno("open",_("Could not open file %s"), FileName.c_str());
 991    }
 992
 993    SetCloseExec(iFd,true);
 994    return true;
 995 }
 996                                                                         /*}}}*/
 997 // FileFd::OpenDescriptor - Open a filedescriptor                       /*{{{*/
 998 // ---------------------------------------------------------------------
 999 /* */
1000 bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose)
1001 {
1002    std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
1003    std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin();
1004    std::string name;
1005
1006    // compat with the old API
1007    if (Mode == ReadOnlyGzip && Compress == None)
1008       Compress = Gzip;
1009
1010    switch (Compress)
1011    {
1012    case None: name = "."; break;
1013    case Gzip: name = "gzip"; break;
1014    case Bzip2: name = "bzip2"; break;
1015    case Lzma: name = "lzma"; break;
1016    case Xz: name = "xz"; break;
1017    case Auto:
1018    case Extension:
1019       if (AutoClose == true && Fd != -1)
1020          close(Fd);
1021       return FileFdError("Opening Fd %d in Auto or Extension compression mode is not supported", Fd);
1022    }
1023    for (; compressor != compressors.end(); ++compressor)
1024       if (compressor->Name == name)
1025          break;
1026    if (compressor == compressors.end())
1027    {
1028       if (AutoClose == true && Fd != -1)
1029          close(Fd);
1030       return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str());
1031    }
1032    return OpenDescriptor(Fd, Mode, *compressor, AutoClose);
1033 }
1034 bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose)
1035 {
1036    Close();
1037    Flags = (AutoClose) ? FileFd::AutoClose : 0;
1038    if (AutoClose == false && (
1039 #ifdef HAVE_ZLIB
1040         compressor.Name == "gzip" ||
1041 #endif
1042 #ifdef HAVE_BZ2
1043         compressor.Name == "bzip2" ||
1044 #endif
1045         false))
1046    {
1047       // Need to duplicate fd here or gzclose for cleanup will close the fd as well
1048       iFd = dup(Fd);
1049    }
1050    else
1051       iFd = Fd;
1052    this->FileName = "";
1053    if (Fd == -1 || OpenInternDescriptor(Mode, compressor) == false)
1054    {
1055       if (iFd != -1 && (
1056 #ifdef HAVE_ZLIB
1057         compressor.Name == "gzip" ||
1058 #endif
1059 #ifdef HAVE_BZ2
1060         compressor.Name == "bzip2" ||
1061 #endif
1062         AutoClose == true))
1063       {
1064          close (iFd);
1065          iFd = -1;
1066       }
1067       return FileFdError(_("Could not open file descriptor %d"), Fd);
1068    }
1069    return true;
1070 }
1071 bool FileFd::OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor)
1072 {
1073    if (compressor.Name == "." || compressor.Binary.empty() == true)
1074       return true;
1075
1076    if (d == NULL)
1077    {
1078       d = new FileFdPrivate();
1079       d->openmode = Mode;
1080       d->compressor = compressor;
1081    }
1082
1083 #ifdef HAVE_ZLIB
1084    if (compressor.Name == "gzip")
1085    {
1086       if (d->gz != NULL)
1087       {
1088          gzclose(d->gz);
1089          d->gz = NULL;
1090       }
1091       if ((Mode & ReadWrite) == ReadWrite)
1092          d->gz = gzdopen(iFd, "r+");
1093       else if ((Mode & WriteOnly) == WriteOnly)
1094          d->gz = gzdopen(iFd, "w");
1095       else
1096          d->gz = gzdopen(iFd, "r");
1097       if (d->gz == NULL)
1098          return false;
1099       Flags |= Compressed;
1100       return true;
1101    }
1102 #endif
1103 #ifdef HAVE_BZ2
1104    if (compressor.Name == "bzip2")
1105    {
1106       if (d->bz2 != NULL)
1107       {
1108          BZ2_bzclose(d->bz2);
1109          d->bz2 = NULL;
1110       }
1111       if ((Mode & ReadWrite) == ReadWrite)
1112          d->bz2 = BZ2_bzdopen(iFd, "r+");
1113       else if ((Mode & WriteOnly) == WriteOnly)
1114          d->bz2 = BZ2_bzdopen(iFd, "w");
1115       else
1116          d->bz2 = BZ2_bzdopen(iFd, "r");
1117       if (d->bz2 == NULL)
1118          return false;
1119       Flags |= Compressed;
1120       return true;
1121    }
1122 #endif
1123
1124    // collect zombies here in case we reopen
1125    if (d->compressor_pid > 0)
1126       ExecWait(d->compressor_pid, "FileFdCompressor", true);
1127
1128    if ((Mode & ReadWrite) == ReadWrite)
1129       return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str());
1130
1131    bool const Comp = (Mode & WriteOnly) == WriteOnly;
1132    if (Comp == false)
1133    {
1134       // Handle 'decompression' of empty files
1135       struct stat Buf;
1136       fstat(iFd, &Buf);
1137       if (Buf.st_size == 0 && S_ISFIFO(Buf.st_mode) == false)
1138          return true;
1139
1140       // We don't need the file open - instead let the compressor open it
1141       // as he properly knows better how to efficiently read from 'his' file
1142       if (FileName.empty() == false)
1143       {
1144          close(iFd);
1145          iFd = -1;
1146       }
1147    }
1148
1149    // Create a data pipe
1150    int Pipe[2] = {-1,-1};
1151    if (pipe(Pipe) != 0)
1152       return FileFdErrno("pipe",_("Failed to create subprocess IPC"));
1153    for (int J = 0; J != 2; J++)
1154       SetCloseExec(Pipe[J],true);
1155
1156    d->compressed_fd = iFd;
1157    d->pipe = true;
1158
1159    if (Comp == true)
1160       iFd = Pipe[1];
1161    else
1162       iFd = Pipe[0];
1163
1164    // The child..
1165    d->compressor_pid = ExecFork();
1166    if (d->compressor_pid == 0)
1167    {
1168       if (Comp == true)
1169       {
1170          dup2(d->compressed_fd,STDOUT_FILENO);
1171          dup2(Pipe[0],STDIN_FILENO);
1172       }
1173       else
1174       {
1175          if (FileName.empty() == true)
1176             dup2(d->compressed_fd,STDIN_FILENO);
1177          dup2(Pipe[1],STDOUT_FILENO);
1178       }
1179       int const nullfd = open("/dev/null", O_WRONLY);
1180       if (nullfd != -1)
1181       {
1182          dup2(nullfd,STDERR_FILENO);
1183          close(nullfd);
1184       }
1185
1186       SetCloseExec(STDOUT_FILENO,false);
1187       SetCloseExec(STDIN_FILENO,false);
1188
1189       std::vector<char const*> Args;
1190       Args.push_back(compressor.Binary.c_str());
1191       std::vector<std::string> const * const addArgs =
1192                 (Comp == true) ? &(compressor.CompressArgs) : &(compressor.UncompressArgs);
1193       for (std::vector<std::string>::const_iterator a = addArgs->begin();
1194            a != addArgs->end(); ++a)
1195          Args.push_back(a->c_str());
1196       if (Comp == false && FileName.empty() == false)
1197       {
1198          Args.push_back("--stdout");
1199          if (TemporaryFileName.empty() == false)
1200             Args.push_back(TemporaryFileName.c_str());
1201          else
1202             Args.push_back(FileName.c_str());
1203       }
1204       Args.push_back(NULL);
1205
1206       execvp(Args[0],(char **)&Args[0]);
1207       cerr << _("Failed to exec compressor ") << Args[0] << endl;
1208       _exit(100);
1209    }
1210    if (Comp == true)
1211       close(Pipe[0]);
1212    else
1213       close(Pipe[1]);
1214
1215    return true;
1216 }
1217                                                                         /*}}}*/
1218 // FileFd::~File - Closes the file                                      /*{{{*/
1219 // ---------------------------------------------------------------------
1220 /* If the proper modes are selected then we close the Fd and possibly
1221    unlink the file on error. */
1222 FileFd::~FileFd()
1223 {
1224    Close();
1225    if (d != NULL)
1226       d->CloseDown(FileName);
1227    delete d;
1228    d = NULL;
1229 }
1230                                                                         /*}}}*/
1231 // FileFd::Read - Read a bit of the file                                /*{{{*/
1232 // ---------------------------------------------------------------------
1233 /* We are carefull to handle interruption by a signal while reading
1234    gracefully. */
1235 bool FileFd::Read(void *To,unsigned long long Size,unsigned long long *Actual)
1236 {
1237    int Res;
1238    errno = 0;
1239    if (Actual != 0)
1240       *Actual = 0;
1241    *((char *)To) = '\0';
1242    do
1243    {
1244 #ifdef HAVE_ZLIB
1245       if (d != NULL && d->gz != NULL)
1246          Res = gzread(d->gz,To,Size);
1247       else
1248 #endif
1249 #ifdef HAVE_BZ2
1250       if (d != NULL && d->bz2 != NULL)
1251          Res = BZ2_bzread(d->bz2,To,Size);
1252       else
1253 #endif
1254          Res = read(iFd,To,Size);
1255
1256       if (Res < 0)
1257       {
1258          if (errno == EINTR)
1259             continue;
1260 #ifdef HAVE_ZLIB
1261          if (d != NULL && d->gz != NULL)
1262          {
1263             int err;
1264             char const * const errmsg = gzerror(d->gz, &err);
1265             if (err != Z_ERRNO)
1266                return FileFdError("gzread: %s (%d: %s)", _("Read error"), err, errmsg);
1267          }
1268 #endif
1269 #ifdef HAVE_BZ2
1270          if (d != NULL && d->bz2 != NULL)
1271          {
1272             int err;
1273             char const * const errmsg = BZ2_bzerror(d->bz2, &err);
1274             if (err != BZ_IO_ERROR)
1275                return FileFdError("BZ2_bzread: %s (%d: %s)", _("Read error"), err, errmsg);
1276          }
1277 #endif
1278          return FileFdErrno("read",_("Read error"));
1279       }
1280
1281       To = (char *)To + Res;
1282       Size -= Res;
1283       if (d != NULL)
1284          d->seekpos += Res;
1285       if (Actual != 0)
1286          *Actual += Res;
1287    }
1288    while (Res > 0 && Size > 0);
1289
1290    if (Size == 0)
1291       return true;
1292
1293    // Eof handling
1294    if (Actual != 0)
1295    {
1296       Flags |= HitEof;
1297       return true;
1298    }
1299
1300    return FileFdError(_("read, still have %llu to read but none left"), Size);
1301 }
1302                                                                         /*}}}*/
1303 // FileFd::ReadLine - Read a complete line from the file                /*{{{*/
1304 // ---------------------------------------------------------------------
1305 /* Beware: This method can be quiet slow for big buffers on UNcompressed
1306    files because of the naive implementation! */
1307 char* FileFd::ReadLine(char *To, unsigned long long const Size)
1308 {
1309    *To = '\0';
1310 #ifdef HAVE_ZLIB
1311    if (d != NULL && d->gz != NULL)
1312       return gzgets(d->gz, To, Size);
1313 #endif
1314
1315    unsigned long long read = 0;
1316    while ((Size - 1) != read)
1317    {
1318       unsigned long long done = 0;
1319       if (Read(To + read, 1, &done) == false)
1320          return NULL;
1321       if (done == 0)
1322          break;
1323       if (To[read++] == '\n')
1324          break;
1325    }
1326    if (read == 0)
1327       return NULL;
1328    To[read] = '\0';
1329    return To;
1330 }
1331                                                                         /*}}}*/
1332 // FileFd::Write - Write to the file                                    /*{{{*/
1333 // ---------------------------------------------------------------------
1334 /* */
1335 bool FileFd::Write(const void *From,unsigned long long Size)
1336 {
1337    int Res;
1338    errno = 0;
1339    do
1340    {
1341 #ifdef HAVE_ZLIB
1342       if (d != NULL && d->gz != NULL)
1343          Res = gzwrite(d->gz,From,Size);
1344       else
1345 #endif
1346 #ifdef HAVE_BZ2
1347       if (d != NULL && d->bz2 != NULL)
1348          Res = BZ2_bzwrite(d->bz2,(void*)From,Size);
1349       else
1350 #endif
1351          Res = write(iFd,From,Size);
1352       if (Res < 0 && errno == EINTR)
1353          continue;
1354       if (Res < 0)
1355       {
1356 #ifdef HAVE_ZLIB
1357          if (d != NULL && d->gz != NULL)
1358          {
1359             int err;
1360             char const * const errmsg = gzerror(d->gz, &err);
1361             if (err != Z_ERRNO)
1362                return FileFdError("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
1363          }
1364 #endif
1365 #ifdef HAVE_BZ2
1366          if (d != NULL && d->bz2 != NULL)
1367          {
1368             int err;
1369             char const * const errmsg = BZ2_bzerror(d->bz2, &err);
1370             if (err != BZ_IO_ERROR)
1371                return FileFdError("BZ2_bzwrite: %s (%d: %s)", _("Write error"), err, errmsg);
1372          }
1373 #endif
1374          return FileFdErrno("write",_("Write error"));
1375       }
1376
1377       From = (char *)From + Res;
1378       Size -= Res;
1379       if (d != NULL)
1380          d->seekpos += Res;
1381    }
1382    while (Res > 0 && Size > 0);
1383
1384    if (Size == 0)
1385       return true;
1386
1387    return FileFdError(_("write, still have %llu to write but couldn't"), Size);
1388 }
1389 bool FileFd::Write(int Fd, const void *From, unsigned long long Size)
1390 {
1391    int Res;
1392    errno = 0;
1393    do
1394    {
1395       Res = write(Fd,From,Size);
1396       if (Res < 0 && errno == EINTR)
1397          continue;
1398       if (Res < 0)
1399          return _error->Errno("write",_("Write error"));
1400
1401       From = (char *)From + Res;
1402       Size -= Res;
1403    }
1404    while (Res > 0 && Size > 0);
1405
1406    if (Size == 0)
1407       return true;
1408
1409    return _error->Error(_("write, still have %llu to write but couldn't"), Size);
1410 }
1411                                                                         /*}}}*/
1412 // FileFd::Seek - Seek in the file                                      /*{{{*/
1413 // ---------------------------------------------------------------------
1414 /* */
1415 bool FileFd::Seek(unsigned long long To)
1416 {
1417    if (d != NULL && (d->pipe == true
1418 #ifdef HAVE_BZ2
1419                         || d->bz2 != NULL
1420 #endif
1421         ))
1422    {
1423       // Our poor man seeking in pipes is costly, so try to avoid it
1424       unsigned long long seekpos = Tell();
1425       if (seekpos == To)
1426          return true;
1427       else if (seekpos < To)
1428          return Skip(To - seekpos);
1429
1430       if ((d->openmode & ReadOnly) != ReadOnly)
1431          return FileFdError("Reopen is only implemented for read-only files!");
1432 #ifdef HAVE_BZ2
1433      if (d->bz2 != NULL)
1434      {
1435         BZ2_bzclose(d->bz2);
1436         d->bz2 = NULL;
1437      }
1438 #endif
1439       if (iFd != -1)
1440          close(iFd);
1441       iFd = -1;
1442       if (TemporaryFileName.empty() == false)
1443          iFd = open(TemporaryFileName.c_str(), O_RDONLY);
1444       else if (FileName.empty() == false)
1445          iFd = open(FileName.c_str(), O_RDONLY);
1446       else
1447       {
1448          if (d->compressed_fd > 0)
1449             if (lseek(d->compressed_fd, 0, SEEK_SET) != 0)
1450                iFd = d->compressed_fd;
1451          if (iFd < 0)
1452             return FileFdError("Reopen is not implemented for pipes opened with FileFd::OpenDescriptor()!");
1453       }
1454
1455       if (OpenInternDescriptor(d->openmode, d->compressor) == false)
1456          return FileFdError("Seek on file %s because it couldn't be reopened", FileName.c_str());
1457
1458       if (To != 0)
1459          return Skip(To);
1460
1461       d->seekpos = To;
1462       return true;
1463    }
1464    int res;
1465 #ifdef HAVE_ZLIB
1466    if (d != NULL && d->gz)
1467       res = gzseek(d->gz,To,SEEK_SET);
1468    else
1469 #endif
1470       res = lseek(iFd,To,SEEK_SET);
1471    if (res != (signed)To)
1472       return FileFdError("Unable to seek to %llu", To);
1473
1474    if (d != NULL)
1475       d->seekpos = To;
1476    return true;
1477 }
1478                                                                         /*}}}*/
1479 // FileFd::Skip - Seek in the file                                      /*{{{*/
1480 // ---------------------------------------------------------------------
1481 /* */
1482 bool FileFd::Skip(unsigned long long Over)
1483 {
1484    if (d != NULL && (d->pipe == true
1485 #ifdef HAVE_BZ2
1486                         || d->bz2 != NULL
1487 #endif
1488         ))
1489    {
1490       d->seekpos += Over;
1491       char buffer[1024];
1492       while (Over != 0)
1493       {
1494          unsigned long long toread = std::min((unsigned long long) sizeof(buffer), Over);
1495          if (Read(buffer, toread) == false)
1496             return FileFdError("Unable to seek ahead %llu",Over);
1497          Over -= toread;
1498       }
1499       return true;
1500    }
1501
1502    int res;
1503 #ifdef HAVE_ZLIB
1504    if (d != NULL && d->gz != NULL)
1505       res = gzseek(d->gz,Over,SEEK_CUR);
1506    else
1507 #endif
1508       res = lseek(iFd,Over,SEEK_CUR);
1509    if (res < 0)
1510       return FileFdError("Unable to seek ahead %llu",Over);
1511    if (d != NULL)
1512       d->seekpos = res;
1513
1514    return true;
1515 }
1516                                                                         /*}}}*/
1517 // FileFd::Truncate - Truncate the file                                 /*{{{*/
1518 // ---------------------------------------------------------------------
1519 /* */
1520 bool FileFd::Truncate(unsigned long long To)
1521 {
1522 #if defined HAVE_ZLIB || defined HAVE_BZ2
1523    if (d != NULL && (d->gz != NULL || d->bz2 != NULL))
1524       return FileFdError("Truncating compressed files is not implemented (%s)", FileName.c_str());
1525 #endif
1526    if (ftruncate(iFd,To) != 0)
1527       return FileFdError("Unable to truncate to %llu",To);
1528
1529    return true;
1530 }
1531                                                                         /*}}}*/
1532 // FileFd::Tell - Current seek position                                 /*{{{*/
1533 // ---------------------------------------------------------------------
1534 /* */
1535 unsigned long long FileFd::Tell()
1536 {
1537    // In theory, we could just return seekpos here always instead of
1538    // seeking around, but not all users of FileFd use always Seek() and co
1539    // so d->seekpos isn't always true and we can just use it as a hint if
1540    // we have nothing else, but not always as an authority…
1541    if (d != NULL && (d->pipe == true
1542 #ifdef HAVE_BZ2
1543                         || d->bz2 != NULL
1544 #endif
1545         ))
1546       return d->seekpos;
1547
1548    off_t Res;
1549 #ifdef HAVE_ZLIB
1550    if (d != NULL && d->gz != NULL)
1551      Res = gztell(d->gz);
1552    else
1553 #endif
1554      Res = lseek(iFd,0,SEEK_CUR);
1555    if (Res == (off_t)-1)
1556       FileFdErrno("lseek","Failed to determine the current file position");
1557    if (d != NULL)
1558       d->seekpos = Res;
1559    return Res;
1560 }
1561                                                                         /*}}}*/
1562 // FileFd::FileSize - Return the size of the file                       /*{{{*/
1563 // ---------------------------------------------------------------------
1564 /* */
1565 unsigned long long FileFd::FileSize()
1566 {
1567    struct stat Buf;
1568    if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
1569       return FileFdErrno("fstat","Unable to determine the file size");
1570
1571    // for compressor pipes st_size is undefined and at 'best' zero
1572    if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
1573    {
1574       // we set it here, too, as we get the info here for free
1575       // in theory the Open-methods should take care of it already
1576       if (d != NULL)
1577          d->pipe = true;
1578       if (stat(FileName.c_str(), &Buf) != 0)
1579          return FileFdErrno("stat","Unable to determine the file size");
1580    }
1581
1582    return Buf.st_size;
1583 }
1584                                                                         /*}}}*/
1585 // FileFd::Size - Return the size of the content in the file            /*{{{*/
1586 // ---------------------------------------------------------------------
1587 /* */
1588 unsigned long long FileFd::Size()
1589 {
1590    unsigned long long size = FileSize();
1591
1592    // for compressor pipes st_size is undefined and at 'best' zero,
1593    // so we 'read' the content and 'seek' back - see there
1594    if (d != NULL && (d->pipe == true
1595 #ifdef HAVE_BZ2
1596                         || (d->bz2 && size > 0)
1597 #endif
1598         ))
1599    {
1600       unsigned long long const oldSeek = Tell();
1601       char ignore[1000];
1602       unsigned long long read = 0;
1603       do {
1604          if (Read(ignore, sizeof(ignore), &read) == false)
1605          {
1606             Seek(oldSeek);
1607             return 0;
1608          }
1609       } while(read != 0);
1610       size = Tell();
1611       Seek(oldSeek);
1612    }
1613 #ifdef HAVE_ZLIB
1614    // only check gzsize if we are actually a gzip file, just checking for
1615    // "gz" is not sufficient as uncompressed files could be opened with
1616    // gzopen in "direct" mode as well
1617    else if (d != NULL && d->gz && !gzdirect(d->gz) && size > 0)
1618    {
1619        off_t const oldPos = lseek(iFd,0,SEEK_CUR);
1620        /* unfortunately zlib.h doesn't provide a gzsize(), so we have to do
1621         * this ourselves; the original (uncompressed) file size is the last 32
1622         * bits of the file */
1623        // FIXME: Size for gz-files is limited by 32bit… no largefile support
1624        if (lseek(iFd, -4, SEEK_END) < 0)
1625        {
1626           FileFdErrno("lseek","Unable to seek to end of gzipped file");
1627           return 0;
1628        }
1629        size = 0;
1630        if (read(iFd, &size, 4) != 4)
1631        {
1632           FileFdErrno("read","Unable to read original size of gzipped file");
1633           return 0;
1634        }
1635
1636 #ifdef WORDS_BIGENDIAN
1637        uint32_t tmp_size = size;
1638        uint8_t const * const p = (uint8_t const * const) &tmp_size;
1639        tmp_size = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0];
1640        size = tmp_size;
1641 #endif
1642
1643        if (lseek(iFd, oldPos, SEEK_SET) < 0)
1644        {
1645           FileFdErrno("lseek","Unable to seek in gzipped file");
1646           return 0;
1647        }
1648
1649        return size;
1650    }
1651 #endif
1652
1653    return size;
1654 }
1655                                                                         /*}}}*/
1656 // FileFd::ModificationTime - Return the time of last touch             /*{{{*/
1657 // ---------------------------------------------------------------------
1658 /* */
1659 time_t FileFd::ModificationTime()
1660 {
1661    struct stat Buf;
1662    if ((d == NULL || d->pipe == false) && fstat(iFd,&Buf) != 0)
1663    {
1664       FileFdErrno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
1665       return 0;
1666    }
1667
1668    // for compressor pipes st_size is undefined and at 'best' zero
1669    if ((d != NULL && d->pipe == true) || S_ISFIFO(Buf.st_mode))
1670    {
1671       // we set it here, too, as we get the info here for free
1672       // in theory the Open-methods should take care of it already
1673       if (d != NULL)
1674          d->pipe = true;
1675       if (stat(FileName.c_str(), &Buf) != 0)
1676       {
1677          FileFdErrno("fstat","Unable to determine the modification time of file %s", FileName.c_str());
1678          return 0;
1679       }
1680    }
1681
1682    return Buf.st_mtime;
1683 }
1684                                                                         /*}}}*/
1685 // FileFd::Close - Close the file if the close flag is set              /*{{{*/
1686 // ---------------------------------------------------------------------
1687 /* */
1688 bool FileFd::Close()
1689 {
1690    if (iFd == -1)
1691       return true;
1692
1693    bool Res = true;
1694    if ((Flags & AutoClose) == AutoClose)
1695    {
1696       if ((Flags & Compressed) != Compressed && iFd > 0 && close(iFd) != 0)
1697          Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
1698
1699       if (d != NULL)
1700       {
1701          Res &= d->CloseDown(FileName);
1702          delete d;
1703          d = NULL;
1704       }
1705    }
1706
1707    if ((Flags & Replace) == Replace) {
1708       if (rename(TemporaryFileName.c_str(), FileName.c_str()) != 0)
1709          Res &= _error->Errno("rename",_("Problem renaming the file %s to %s"), TemporaryFileName.c_str(), FileName.c_str());
1710
1711       FileName = TemporaryFileName; // for the unlink() below.
1712       TemporaryFileName.clear();
1713    }
1714
1715    iFd = -1;
1716
1717    if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
1718        FileName.empty() == false)
1719       if (unlink(FileName.c_str()) != 0)
1720          Res &= _error->WarningE("unlnk",_("Problem unlinking the file %s"), FileName.c_str());
1721
1722    if (Res == false)
1723       Flags |= Fail;
1724    return Res;
1725 }
1726                                                                         /*}}}*/
1727 // FileFd::Sync - Sync the file                                         /*{{{*/
1728 // ---------------------------------------------------------------------
1729 /* */
1730 bool FileFd::Sync()
1731 {
1732    if (fsync(iFd) != 0)
1733       return FileFdErrno("sync",_("Problem syncing the file"));
1734    return true;
1735 }
1736                                                                         /*}}}*/
1737 // FileFd::FileFdErrno - set Fail and call _error->Errno                *{{{*/
1738 bool FileFd::FileFdErrno(const char *Function, const char *Description,...)
1739 {
1740    Flags |= Fail;
1741    va_list args;
1742    size_t msgSize = 400;
1743    int const errsv = errno;
1744    while (true)
1745    {
1746       va_start(args,Description);
1747       if (_error->InsertErrno(GlobalError::ERROR, Function, Description, args, errsv, msgSize) == false)
1748          break;
1749       va_end(args);
1750    }
1751    return false;
1752 }
1753                                                                         /*}}}*/
1754 // FileFd::FileFdError - set Fail and call _error->Error                *{{{*/
1755 bool FileFd::FileFdError(const char *Description,...) {
1756    Flags |= Fail;
1757    va_list args;
1758    size_t msgSize = 400;
1759    while (true)
1760    {
1761       va_start(args,Description);
1762       if (_error->Insert(GlobalError::ERROR, Description, args, msgSize) == false)
1763          break;
1764       va_end(args);
1765    }
1766    return false;
1767 }
1768                                                                         /*}}}*/
1769
1770 gzFile FileFd::gzFd() { return (gzFile) d->gz; }
1771
1772
1773 // Glob - wrapper around "glob()"                                      /*{{{*/
1774 // ---------------------------------------------------------------------
1775 /* */
1776 std::vector<std::string> Glob(std::string const &pattern, int flags)
1777 {
1778    std::vector<std::string> result;
1779    glob_t globbuf;
1780    int glob_res, i;
1781
1782    glob_res = glob(pattern.c_str(),  flags, NULL, &globbuf);
1783
1784    if (glob_res != 0)
1785    {
1786       if(glob_res != GLOB_NOMATCH) {
1787          _error->Errno("glob", "Problem with glob");
1788          return result;
1789       }
1790    }
1791
1792    // append results
1793    for(i=0;i<globbuf.gl_pathc;i++)
1794       result.push_back(string(globbuf.gl_pathv[i]));
1795
1796    globfree(&globbuf);
1797    return result;
1798 }
1799                                                                         /*}}}*/