| 1 | // -*- mode: cpp; mode: fold -*- |
| 2 | // Description /*{{{*/ |
| 3 | /* ###################################################################### |
| 4 | |
| 5 | File Utilities |
| 6 | |
| 7 | CopyFile - Buffered copy of a single file |
| 8 | GetLock - dpkg compatible lock file manipulation (fcntl) |
| 9 | |
| 10 | Most of this source is placed in the Public Domain, do with it what |
| 11 | you will |
| 12 | It was originally written by Jason Gunthorpe <jgg@debian.org>. |
| 13 | FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com> |
| 14 | |
| 15 | The exception is RunScripts() it is under the GPLv2 |
| 16 | |
| 17 | ##################################################################### */ |
| 18 | /*}}}*/ |
| 19 | // Include Files /*{{{*/ |
| 20 | #include <config.h> |
| 21 | |
| 22 | #include <apt-pkg/fileutl.h> |
| 23 | #include <apt-pkg/strutl.h> |
| 24 | #include <apt-pkg/error.h> |
| 25 | #include <apt-pkg/sptr.h> |
| 26 | #include <apt-pkg/aptconfiguration.h> |
| 27 | #include <apt-pkg/configuration.h> |
| 28 | #include <apt-pkg/macros.h> |
| 29 | |
| 30 | #include <ctype.h> |
| 31 | #include <stdarg.h> |
| 32 | #include <stddef.h> |
| 33 | #include <sys/select.h> |
| 34 | #include <time.h> |
| 35 | #include <string> |
| 36 | #include <vector> |
| 37 | #include <cstdlib> |
| 38 | #include <cstring> |
| 39 | #include <cstdio> |
| 40 | #include <iostream> |
| 41 | #include <unistd.h> |
| 42 | #include <fcntl.h> |
| 43 | #include <sys/stat.h> |
| 44 | #include <sys/time.h> |
| 45 | #include <sys/wait.h> |
| 46 | #include <dirent.h> |
| 47 | #include <signal.h> |
| 48 | #include <errno.h> |
| 49 | #include <glob.h> |
| 50 | |
| 51 | #include <set> |
| 52 | #include <algorithm> |
| 53 | |
| 54 | #ifdef HAVE_ZLIB |
| 55 | #include <zlib.h> |
| 56 | #endif |
| 57 | #ifdef HAVE_BZ2 |
| 58 | #include <bzlib.h> |
| 59 | #endif |
| 60 | #ifdef HAVE_LZMA |
| 61 | #include <stdint.h> |
| 62 | #include <lzma.h> |
| 63 | #endif |
| 64 | |
| 65 | #ifdef WORDS_BIGENDIAN |
| 66 | #include <inttypes.h> |
| 67 | #endif |
| 68 | |
| 69 | #include <apti18n.h> |
| 70 | /*}}}*/ |
| 71 | |
| 72 | using namespace std; |
| 73 | |
| 74 | // RunScripts - Run a set of scripts from a configuration subtree /*{{{*/ |
| 75 | // --------------------------------------------------------------------- |
| 76 | /* */ |
| 77 | bool RunScripts(const char *Cnf) |
| 78 | { |
| 79 | Configuration::Item const *Opts = _config->Tree(Cnf); |
| 80 | if (Opts == 0 || Opts->Child == 0) |
| 81 | return true; |
| 82 | Opts = Opts->Child; |
| 83 | |
| 84 | // Fork for running the system calls |
| 85 | pid_t Child = ExecFork(); |
| 86 | |
| 87 | // This is the child |
| 88 | if (Child == 0) |
| 89 | { |
| 90 | if (_config->FindDir("DPkg::Chroot-Directory","/") != "/") |
| 91 | { |
| 92 | std::cerr << "Chrooting into " |
| 93 | << _config->FindDir("DPkg::Chroot-Directory") |
| 94 | << std::endl; |
| 95 | if (chroot(_config->FindDir("DPkg::Chroot-Directory","/").c_str()) != 0) |
| 96 | _exit(100); |
| 97 | } |
| 98 | |
| 99 | if (chdir("/tmp/") != 0) |
| 100 | _exit(100); |
| 101 | |
| 102 | unsigned int Count = 1; |
| 103 | for (; Opts != 0; Opts = Opts->Next, Count++) |
| 104 | { |
| 105 | if (Opts->Value.empty() == true) |
| 106 | continue; |
| 107 | |
| 108 | if(_config->FindB("Debug::RunScripts", false) == true) |
| 109 | std::clog << "Running external script: '" |
| 110 | << Opts->Value << "'" << std::endl; |
| 111 | |
| 112 | if (system(Opts->Value.c_str()) != 0) |
| 113 | _exit(100+Count); |
| 114 | } |
| 115 | _exit(0); |
| 116 | } |
| 117 | |
| 118 | // Wait for the child |
| 119 | int Status = 0; |
| 120 | while (waitpid(Child,&Status,0) != Child) |
| 121 | { |
| 122 | if (errno == EINTR) |
| 123 | continue; |
| 124 | return _error->Errno("waitpid","Couldn't wait for subprocess"); |
| 125 | } |
| 126 | |
| 127 | // Restore sig int/quit |
| 128 | signal(SIGQUIT,SIG_DFL); |
| 129 | signal(SIGINT,SIG_DFL); |
| 130 | |
| 131 | // Check for an error code. |
| 132 | if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0) |
| 133 | { |
| 134 | unsigned int Count = WEXITSTATUS(Status); |
| 135 | if (Count > 100) |
| 136 | { |
| 137 | Count -= 100; |
| 138 | for (; Opts != 0 && Count != 1; Opts = Opts->Next, Count--); |
| 139 | _error->Error("Problem executing scripts %s '%s'",Cnf,Opts->Value.c_str()); |
| 140 | } |
| 141 | |
| 142 | return _error->Error("Sub-process returned an error code"); |
| 143 | } |
| 144 | |
| 145 | return true; |
| 146 | } |
| 147 | /*}}}*/ |
| 148 | |
| 149 | // CopyFile - Buffered copy of a file /*{{{*/ |
| 150 | // --------------------------------------------------------------------- |
| 151 | /* The caller is expected to set things so that failure causes erasure */ |
| 152 | bool CopyFile(FileFd &From,FileFd &To) |
| 153 | { |
| 154 | if (From.IsOpen() == false || To.IsOpen() == false || |
| 155 | From.Failed() == true || To.Failed() == true) |
| 156 | return false; |
| 157 | |
| 158 | // Buffered copy between fds |
| 159 | SPtrArray<unsigned char> Buf = new unsigned char[64000]; |
| 160 | unsigned long long Size = From.Size(); |
| 161 | while (Size != 0) |
| 162 | { |
| 163 | unsigned long long ToRead = Size; |
| 164 | if (Size > 64000) |
| 165 | ToRead = 64000; |
| 166 | |
| 167 | if (From.Read(Buf,ToRead) == false || |
| 168 | To.Write(Buf,ToRead) == false) |
| 169 | return false; |
| 170 | |
| 171 | Size -= ToRead; |
| 172 | } |
| 173 | |
| 174 | return true; |
| 175 | } |
| 176 | /*}}}*/ |
| 177 | // GetLock - Gets a lock file /*{{{*/ |
| 178 | // --------------------------------------------------------------------- |
| 179 | /* This will create an empty file of the given name and lock it. Once this |
| 180 | is done all other calls to GetLock in any other process will fail with |
| 181 | -1. The return result is the fd of the file, the call should call |
| 182 | close at some time. */ |
| 183 | int GetLock(string File,bool Errors) |
| 184 | { |
| 185 | // GetLock() is used in aptitude on directories with public-write access |
| 186 | // Use O_NOFOLLOW here to prevent symlink traversal attacks |
| 187 | int FD = open(File.c_str(),O_RDWR | O_CREAT | O_NOFOLLOW,0640); |
| 188 | if (FD < 0) |
| 189 | { |
| 190 | // Read only .. can't have locking problems there. |
| 191 | if (errno == EROFS) |
| 192 | { |
| 193 | _error->Warning(_("Not using locking for read only lock file %s"),File.c_str()); |
| 194 | return dup(0); // Need something for the caller to close |
| 195 | } |
| 196 | |
| 197 | if (Errors == true) |
| 198 | _error->Errno("open",_("Could not open lock file %s"),File.c_str()); |
| 199 | |
| 200 | // Feh.. We do this to distinguish the lock vs open case.. |
| 201 | errno = EPERM; |
| 202 | return -1; |
| 203 | } |
| 204 | SetCloseExec(FD,true); |
| 205 | |
| 206 | // Acquire a write lock |
| 207 | struct flock fl; |
| 208 | fl.l_type = F_WRLCK; |
| 209 | fl.l_whence = SEEK_SET; |
| 210 | fl.l_start = 0; |
| 211 | fl.l_len = 0; |
| 212 | if (fcntl(FD,F_SETLK,&fl) == -1) |
| 213 | { |
| 214 | // always close to not leak resources |
| 215 | int Tmp = errno; |
| 216 | close(FD); |
| 217 | errno = Tmp; |
| 218 | |
| 219 | if (errno == ENOLCK) |
| 220 | { |
| 221 | _error->Warning(_("Not using locking for nfs mounted lock file %s"),File.c_str()); |
| 222 | return dup(0); // Need something for the caller to close |
| 223 | } |
| 224 | |
| 225 | if (Errors == true) |
| 226 | _error->Errno("open",_("Could not get lock %s"),File.c_str()); |
| 227 | |
| 228 | return -1; |
| 229 | } |
| 230 | |
| 231 | return FD; |
| 232 | } |
| 233 | /*}}}*/ |
| 234 | // FileExists - Check if a file exists /*{{{*/ |
| 235 | // --------------------------------------------------------------------- |
| 236 | /* Beware: Directories are also files! */ |
| 237 | bool FileExists(string File) |
| 238 | { |
| 239 | struct stat Buf; |
| 240 | if (stat(File.c_str(),&Buf) != 0) |
| 241 | return false; |
| 242 | return true; |
| 243 | } |
| 244 | /*}}}*/ |
| 245 | // RealFileExists - Check if a file exists and if it is really a file /*{{{*/ |
| 246 | // --------------------------------------------------------------------- |
| 247 | /* */ |
| 248 | bool RealFileExists(string File) |
| 249 | { |
| 250 | struct stat Buf; |
| 251 | if (stat(File.c_str(),&Buf) != 0) |
| 252 | return false; |
| 253 | return ((Buf.st_mode & S_IFREG) != 0); |
| 254 | } |
| 255 | /*}}}*/ |
| 256 | // DirectoryExists - Check if a directory exists and is really one /*{{{*/ |
| 257 | // --------------------------------------------------------------------- |
| 258 | /* */ |
| 259 | bool DirectoryExists(string const &Path) |
| 260 | { |
| 261 | struct stat Buf; |
| 262 | if (stat(Path.c_str(),&Buf) != 0) |
| 263 | return false; |
| 264 | return ((Buf.st_mode & S_IFDIR) != 0); |
| 265 | } |
| 266 | /*}}}*/ |
| 267 | // CreateDirectory - poor man's mkdir -p guarded by a parent directory /*{{{*/ |
| 268 | // --------------------------------------------------------------------- |
| 269 | /* This method will create all directories needed for path in good old |
| 270 | mkdir -p style but refuses to do this if Parent is not a prefix of |
| 271 | this Path. Example: /var/cache/ and /var/cache/apt/archives are given, |
| 272 | so it will create apt/archives if /var/cache exists - on the other |
| 273 | hand if the parent is /var/lib the creation will fail as this path |
| 274 | is not a parent of the path to be generated. */ |
| 275 | bool CreateDirectory(string const &Parent, string const &Path) |
| 276 | { |
| 277 | if (Parent.empty() == true || Path.empty() == true) |
| 278 | return false; |
| 279 | |
| 280 | if (DirectoryExists(Path) == true) |
| 281 | return true; |
| 282 | |
| 283 | if (DirectoryExists(Parent) == false) |
| 284 | return false; |
| 285 | |
| 286 | // we are not going to create directories "into the blue" |
| 287 | if (Path.compare(0, Parent.length(), Parent) != 0) |
| 288 | return false; |
| 289 | |
| 290 | vector<string> const dirs = VectorizeString(Path.substr(Parent.size()), '/'); |
| 291 | string progress = Parent; |
| 292 | for (vector<string>::const_iterator d = dirs.begin(); d != dirs.end(); ++d) |
| 293 | { |
| 294 | if (d->empty() == true) |
| 295 | continue; |
| 296 | |
| 297 | progress.append("/").append(*d); |
| 298 | if (DirectoryExists(progress) == true) |
| 299 | continue; |
| 300 | |
| 301 | if (mkdir(progress.c_str(), 0755) != 0) |
| 302 | return false; |
| 303 | } |
| 304 | return true; |
| 305 | } |
| 306 | /*}}}*/ |
| 307 | // CreateAPTDirectoryIfNeeded - ensure that the given directory exists /*{{{*/ |
| 308 | // --------------------------------------------------------------------- |
| 309 | /* a small wrapper around CreateDirectory to check if it exists and to |
| 310 | remove the trailing "/apt/" from the parent directory if needed */ |
| 311 | bool CreateAPTDirectoryIfNeeded(string const &Parent, string const &Path) |
| 312 | { |
| 313 | if (DirectoryExists(Path) == true) |
| 314 | return true; |
| 315 | |
| 316 | size_t const len = Parent.size(); |
| 317 | if (len > 5 && Parent.find("/apt/", len - 6, 5) == len - 5) |
| 318 | { |
| 319 | if (CreateDirectory(Parent.substr(0,len-5), Path) == true) |
| 320 | return true; |
| 321 | } |
| 322 | else if (CreateDirectory(Parent, Path) == true) |
| 323 | return true; |
| 324 | |
| 325 | return false; |
| 326 | } |
| 327 | /*}}}*/ |
| 328 | // GetListOfFilesInDir - returns a vector of files in the given dir /*{{{*/ |
| 329 | // --------------------------------------------------------------------- |
| 330 | /* If an extension is given only files with this extension are included |
| 331 | in the returned vector, otherwise every "normal" file is included. */ |
| 332 | std::vector<string> GetListOfFilesInDir(string const &Dir, string const &Ext, |
| 333 | bool const &SortList, bool const &AllowNoExt) |
| 334 | { |
| 335 | std::vector<string> ext; |
| 336 | ext.reserve(2); |
| 337 | if (Ext.empty() == false) |
| 338 | ext.push_back(Ext); |
| 339 | if (AllowNoExt == true && ext.empty() == false) |
| 340 | ext.push_back(""); |
| 341 | return GetListOfFilesInDir(Dir, ext, SortList); |
| 342 | } |
| 343 | std::vector<string> GetListOfFilesInDir(string const &Dir, std::vector<string> const &Ext, |
| 344 | bool const &SortList) |
| 345 | { |
| 346 | // Attention debuggers: need to be set with the environment config file! |
| 347 | bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false); |
| 348 | if (Debug == true) |
| 349 | { |
| 350 | std::clog << "Accept in " << Dir << " only files with the following " << Ext.size() << " extensions:" << std::endl; |
| 351 | if (Ext.empty() == true) |
| 352 | std::clog << "\tNO extension" << std::endl; |
| 353 | else |
| 354 | for (std::vector<string>::const_iterator e = Ext.begin(); |
| 355 | e != Ext.end(); ++e) |
| 356 | std::clog << '\t' << (e->empty() == true ? "NO" : *e) << " extension" << std::endl; |
| 357 | } |
| 358 | |
| 359 | std::vector<string> List; |
| 360 | |
| 361 | if (DirectoryExists(Dir) == false) |
| 362 | { |
| 363 | _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str()); |
| 364 | return List; |
| 365 | } |
| 366 | |
| 367 | Configuration::MatchAgainstConfig SilentIgnore("Dir::Ignore-Files-Silently"); |
| 368 | DIR *D = opendir(Dir.c_str()); |
| 369 | if (D == 0) |
| 370 | { |
| 371 | _error->Errno("opendir",_("Unable to read %s"),Dir.c_str()); |
| 372 | return List; |
| 373 | } |
| 374 | |
| 375 | for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) |
| 376 | { |
| 377 | // skip "hidden" files |
| 378 | if (Ent->d_name[0] == '.') |
| 379 | continue; |
| 380 | |
| 381 | // Make sure it is a file and not something else |
| 382 | string const File = flCombine(Dir,Ent->d_name); |
| 383 | #ifdef _DIRENT_HAVE_D_TYPE |
| 384 | if (Ent->d_type != DT_REG) |
| 385 | #endif |
| 386 | { |
| 387 | if (RealFileExists(File) == false) |
| 388 | { |
| 389 | // do not show ignoration warnings for directories |
| 390 | if ( |
| 391 | #ifdef _DIRENT_HAVE_D_TYPE |
| 392 | Ent->d_type == DT_DIR || |
| 393 | #endif |
| 394 | DirectoryExists(File) == true) |
| 395 | continue; |
| 396 | if (SilentIgnore.Match(Ent->d_name) == false) |
| 397 | _error->Notice(_("Ignoring '%s' in directory '%s' as it is not a regular file"), Ent->d_name, Dir.c_str()); |
| 398 | continue; |
| 399 | } |
| 400 | } |
| 401 | |
| 402 | // check for accepted extension: |
| 403 | // no extension given -> periods are bad as hell! |
| 404 | // extensions given -> "" extension allows no extension |
| 405 | if (Ext.empty() == false) |
| 406 | { |
| 407 | string d_ext = flExtension(Ent->d_name); |
| 408 | if (d_ext == Ent->d_name) // no extension |
| 409 | { |
| 410 | if (std::find(Ext.begin(), Ext.end(), "") == Ext.end()) |
| 411 | { |
| 412 | if (Debug == true) |
| 413 | std::clog << "Bad file: " << Ent->d_name << " → no extension" << std::endl; |
| 414 | if (SilentIgnore.Match(Ent->d_name) == false) |
| 415 | _error->Notice(_("Ignoring file '%s' in directory '%s' as it has no filename extension"), Ent->d_name, Dir.c_str()); |
| 416 | continue; |
| 417 | } |
| 418 | } |
| 419 | else if (std::find(Ext.begin(), Ext.end(), d_ext) == Ext.end()) |
| 420 | { |
| 421 | if (Debug == true) |
| 422 | std::clog << "Bad file: " << Ent->d_name << " → bad extension »" << flExtension(Ent->d_name) << "«" << std::endl; |
| 423 | if (SilentIgnore.Match(Ent->d_name) == false) |
| 424 | _error->Notice(_("Ignoring file '%s' in directory '%s' as it has an invalid filename extension"), Ent->d_name, Dir.c_str()); |
| 425 | continue; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | // Skip bad filenames ala run-parts |
| 430 | const char *C = Ent->d_name; |
| 431 | for (; *C != 0; ++C) |
| 432 | if (isalpha(*C) == 0 && isdigit(*C) == 0 |
| 433 | && *C != '_' && *C != '-' && *C != ':') { |
| 434 | // no required extension -> dot is a bad character |
| 435 | if (*C == '.' && Ext.empty() == false) |
| 436 | continue; |
| 437 | break; |
| 438 | } |
| 439 | |
| 440 | // we don't reach the end of the name -> bad character included |
| 441 | if (*C != 0) |
| 442 | { |
| 443 | if (Debug == true) |
| 444 | std::clog << "Bad file: " << Ent->d_name << " → bad character »" |
| 445 | << *C << "« in filename (period allowed: " << (Ext.empty() ? "no" : "yes") << ")" << std::endl; |
| 446 | continue; |
| 447 | } |
| 448 | |
| 449 | // skip filenames which end with a period. These are never valid |
| 450 | if (*(C - 1) == '.') |
| 451 | { |
| 452 | if (Debug == true) |
| 453 | std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl; |
| 454 | continue; |
| 455 | } |
| 456 | |
| 457 | if (Debug == true) |
| 458 | std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl; |
| 459 | List.push_back(File); |
| 460 | } |
| 461 | closedir(D); |
| 462 | |
| 463 | if (SortList == true) |
| 464 | std::sort(List.begin(),List.end()); |
| 465 | return List; |
| 466 | } |
| 467 | std::vector<string> GetListOfFilesInDir(string const &Dir, bool SortList) |
| 468 | { |
| 469 | bool const Debug = _config->FindB("Debug::GetListOfFilesInDir", false); |
| 470 | if (Debug == true) |
| 471 | std::clog << "Accept in " << Dir << " all regular files" << std::endl; |
| 472 | |
| 473 | std::vector<string> List; |
| 474 | |
| 475 | if (DirectoryExists(Dir) == false) |
| 476 | { |
| 477 | _error->Error(_("List of files can't be created as '%s' is not a directory"), Dir.c_str()); |
| 478 | return List; |
| 479 | } |
| 480 | |
| 481 | DIR *D = opendir(Dir.c_str()); |
| 482 | if (D == 0) |
| 483 | { |
| 484 | _error->Errno("opendir",_("Unable to read %s"),Dir.c_str()); |
| 485 | return List; |
| 486 | } |
| 487 | |
| 488 | for (struct dirent *Ent = readdir(D); Ent != 0; Ent = readdir(D)) |
| 489 | { |
| 490 | // skip "hidden" files |
| 491 | if (Ent->d_name[0] == '.') |
| 492 | continue; |
| 493 | |
| 494 | // Make sure it is a file and not something else |
| 495 | string const File = flCombine(Dir,Ent->d_name); |
| 496 | #ifdef _DIRENT_HAVE_D_TYPE |
| 497 | if (Ent->d_type != DT_REG) |
| 498 | #endif |
| 499 | { |
| 500 | if (RealFileExists(File) == false) |
| 501 | { |
| 502 | if (Debug == true) |
| 503 | std::clog << "Bad file: " << Ent->d_name << " → it is not a real file" << std::endl; |
| 504 | continue; |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | // Skip bad filenames ala run-parts |
| 509 | const char *C = Ent->d_name; |
| 510 | for (; *C != 0; ++C) |
| 511 | if (isalpha(*C) == 0 && isdigit(*C) == 0 |
| 512 | && *C != '_' && *C != '-' && *C != '.') |
| 513 | break; |
| 514 | |
| 515 | // we don't reach the end of the name -> bad character included |
| 516 | if (*C != 0) |
| 517 | { |
| 518 | if (Debug == true) |
| 519 | std::clog << "Bad file: " << Ent->d_name << " → bad character »" << *C << "« in filename" << std::endl; |
| 520 | continue; |
| 521 | } |
| 522 | |
| 523 | // skip filenames which end with a period. These are never valid |
| 524 | if (*(C - 1) == '.') |
| 525 | { |
| 526 | if (Debug == true) |
| 527 | std::clog << "Bad file: " << Ent->d_name << " → Period as last character" << std::endl; |
| 528 | continue; |
| 529 | } |
| 530 | |
| 531 | if (Debug == true) |
| 532 | std::clog << "Accept file: " << Ent->d_name << " in " << Dir << std::endl; |
| 533 | List.push_back(File); |
| 534 | } |
| 535 | closedir(D); |
| 536 | |
| 537 | if (SortList == true) |
| 538 | std::sort(List.begin(),List.end()); |
| 539 | return List; |
| 540 | } |
| 541 | /*}}}*/ |
| 542 | // SafeGetCWD - This is a safer getcwd that returns a dynamic string /*{{{*/ |
| 543 | // --------------------------------------------------------------------- |
| 544 | /* We return / on failure. */ |
| 545 | string SafeGetCWD() |
| 546 | { |
| 547 | // Stash the current dir. |
| 548 | char S[300]; |
| 549 | S[0] = 0; |
| 550 | if (getcwd(S,sizeof(S)-2) == 0) |
| 551 | return "/"; |
| 552 | unsigned int Len = strlen(S); |
| 553 | S[Len] = '/'; |
| 554 | S[Len+1] = 0; |
| 555 | return S; |
| 556 | } |
| 557 | /*}}}*/ |
| 558 | // GetModificationTime - Get the mtime of the given file or -1 on error /*{{{*/ |
| 559 | // --------------------------------------------------------------------- |
| 560 | /* We return / on failure. */ |
| 561 | time_t GetModificationTime(string const &Path) |
| 562 | { |
| 563 | struct stat St; |
| 564 | if (stat(Path.c_str(), &St) < 0) |
| 565 | return -1; |
| 566 | return St.st_mtime; |
| 567 | } |
| 568 | /*}}}*/ |
| 569 | // flNotDir - Strip the directory from the filename /*{{{*/ |
| 570 | // --------------------------------------------------------------------- |
| 571 | /* */ |
| 572 | string flNotDir(string File) |
| 573 | { |
| 574 | string::size_type Res = File.rfind('/'); |
| 575 | if (Res == string::npos) |
| 576 | return File; |
| 577 | Res++; |
| 578 | return string(File,Res,Res - File.length()); |
| 579 | } |
| 580 | /*}}}*/ |
| 581 | // flNotFile - Strip the file from the directory name /*{{{*/ |
| 582 | // --------------------------------------------------------------------- |
| 583 | /* Result ends in a / */ |
| 584 | string flNotFile(string File) |
| 585 | { |
| 586 | string::size_type Res = File.rfind('/'); |
| 587 | if (Res == string::npos) |
| 588 | return "./"; |
| 589 | Res++; |
| 590 | return string(File,0,Res); |
| 591 | } |
| 592 | /*}}}*/ |
| 593 | // flExtension - Return the extension for the file /*{{{*/ |
| 594 | // --------------------------------------------------------------------- |
| 595 | /* */ |
| 596 | string flExtension(string File) |
| 597 | { |
| 598 | string::size_type Res = File.rfind('.'); |
| 599 | if (Res == string::npos) |
| 600 | return File; |
| 601 | Res++; |
| 602 | return string(File,Res,Res - File.length()); |
| 603 | } |
| 604 | /*}}}*/ |
| 605 | // flNoLink - If file is a symlink then deref it /*{{{*/ |
| 606 | // --------------------------------------------------------------------- |
| 607 | /* If the name is not a link then the returned path is the input. */ |
| 608 | string flNoLink(string File) |
| 609 | { |
| 610 | struct stat St; |
| 611 | if (lstat(File.c_str(),&St) != 0 || S_ISLNK(St.st_mode) == 0) |
| 612 | return File; |
| 613 | if (stat(File.c_str(),&St) != 0) |
| 614 | return File; |
| 615 | |
| 616 | /* Loop resolving the link. There is no need to limit the number of |
| 617 | loops because the stat call above ensures that the symlink is not |
| 618 | circular */ |
| 619 | char Buffer[1024]; |
| 620 | string NFile = File; |
| 621 | while (1) |
| 622 | { |
| 623 | // Read the link |
| 624 | ssize_t Res; |
| 625 | if ((Res = readlink(NFile.c_str(),Buffer,sizeof(Buffer))) <= 0 || |
| 626 | (size_t)Res >= sizeof(Buffer)) |
| 627 | return File; |
| 628 | |
| 629 | // Append or replace the previous path |
| 630 | Buffer[Res] = 0; |
| 631 | if (Buffer[0] == '/') |
| 632 | NFile = Buffer; |
| 633 | else |
| 634 | NFile = flNotFile(NFile) + Buffer; |
| 635 | |
| 636 | // See if we are done |
| 637 | if (lstat(NFile.c_str(),&St) != 0) |
| 638 | return File; |
| 639 | if (S_ISLNK(St.st_mode) == 0) |
| 640 | return NFile; |
| 641 | } |
| 642 | } |
| 643 | /*}}}*/ |
| 644 | // flCombine - Combine a file and a directory /*{{{*/ |
| 645 | // --------------------------------------------------------------------- |
| 646 | /* If the file is an absolute path then it is just returned, otherwise |
| 647 | the directory is pre-pended to it. */ |
| 648 | string flCombine(string Dir,string File) |
| 649 | { |
| 650 | if (File.empty() == true) |
| 651 | return string(); |
| 652 | |
| 653 | if (File[0] == '/' || Dir.empty() == true) |
| 654 | return File; |
| 655 | if (File.length() >= 2 && File[0] == '.' && File[1] == '/') |
| 656 | return File; |
| 657 | if (Dir[Dir.length()-1] == '/') |
| 658 | return Dir + File; |
| 659 | return Dir + '/' + File; |
| 660 | } |
| 661 | /*}}}*/ |
| 662 | // SetCloseExec - Set the close on exec flag /*{{{*/ |
| 663 | // --------------------------------------------------------------------- |
| 664 | /* */ |
| 665 | void SetCloseExec(int Fd,bool Close) |
| 666 | { |
| 667 | if (fcntl(Fd,F_SETFD,(Close == false)?0:FD_CLOEXEC) != 0) |
| 668 | { |
| 669 | cerr << "FATAL -> Could not set close on exec " << strerror(errno) << endl; |
| 670 | exit(100); |
| 671 | } |
| 672 | } |
| 673 | /*}}}*/ |
| 674 | // SetNonBlock - Set the nonblocking flag /*{{{*/ |
| 675 | // --------------------------------------------------------------------- |
| 676 | /* */ |
| 677 | void SetNonBlock(int Fd,bool Block) |
| 678 | { |
| 679 | int Flags = fcntl(Fd,F_GETFL) & (~O_NONBLOCK); |
| 680 | if (fcntl(Fd,F_SETFL,Flags | ((Block == false)?0:O_NONBLOCK)) != 0) |
| 681 | { |
| 682 | cerr << "FATAL -> Could not set non-blocking flag " << strerror(errno) << endl; |
| 683 | exit(100); |
| 684 | } |
| 685 | } |
| 686 | /*}}}*/ |
| 687 | // WaitFd - Wait for a FD to become readable /*{{{*/ |
| 688 | // --------------------------------------------------------------------- |
| 689 | /* This waits for a FD to become readable using select. It is useful for |
| 690 | applications making use of non-blocking sockets. The timeout is |
| 691 | in seconds. */ |
| 692 | bool WaitFd(int Fd,bool write,unsigned long timeout) |
| 693 | { |
| 694 | fd_set Set; |
| 695 | struct timeval tv; |
| 696 | FD_ZERO(&Set); |
| 697 | FD_SET(Fd,&Set); |
| 698 | tv.tv_sec = timeout; |
| 699 | tv.tv_usec = 0; |
| 700 | if (write == true) |
| 701 | { |
| 702 | int Res; |
| 703 | do |
| 704 | { |
| 705 | Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0)); |
| 706 | } |
| 707 | while (Res < 0 && errno == EINTR); |
| 708 | |
| 709 | if (Res <= 0) |
| 710 | return false; |
| 711 | } |
| 712 | else |
| 713 | { |
| 714 | int Res; |
| 715 | do |
| 716 | { |
| 717 | Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0)); |
| 718 | } |
| 719 | while (Res < 0 && errno == EINTR); |
| 720 | |
| 721 | if (Res <= 0) |
| 722 | return false; |
| 723 | } |
| 724 | |
| 725 | return true; |
| 726 | } |
| 727 | /*}}}*/ |
| 728 | // MergeKeepFdsFromConfiguration - Merge APT::Keep-Fds configuration /*{{{*/ |
| 729 | // --------------------------------------------------------------------- |
| 730 | /* This is used to merge the APT::Keep-Fds with the provided KeepFDs |
| 731 | * set. |
| 732 | */ |
| 733 | void MergeKeepFdsFromConfiguration(std::set<int> &KeepFDs) |
| 734 | { |
| 735 | Configuration::Item const *Opts = _config->Tree("APT::Keep-Fds"); |
| 736 | if (Opts != 0 && Opts->Child != 0) |
| 737 | { |
| 738 | Opts = Opts->Child; |
| 739 | for (; Opts != 0; Opts = Opts->Next) |
| 740 | { |
| 741 | if (Opts->Value.empty() == true) |
| 742 | continue; |
| 743 | int fd = atoi(Opts->Value.c_str()); |
| 744 | KeepFDs.insert(fd); |
| 745 | } |
| 746 | } |
| 747 | } |
| 748 | /*}}}*/ |
| 749 | // ExecFork - Magical fork that sanitizes the context before execing /*{{{*/ |
| 750 | // --------------------------------------------------------------------- |
| 751 | /* This is used if you want to cleanse the environment for the forked |
| 752 | child, it fixes up the important signals and nukes all of the fds, |
| 753 | otherwise acts like normal fork. */ |
| 754 | pid_t ExecFork() |
| 755 | { |
| 756 | set<int> KeepFDs; |
| 757 | // we need to merge the Keep-Fds as external tools like |
| 758 | // debconf-apt-progress use it |
| 759 | MergeKeepFdsFromConfiguration(KeepFDs); |
| 760 | return ExecFork(KeepFDs); |
| 761 | } |
| 762 | |
| 763 | pid_t ExecFork(std::set<int> KeepFDs) |
| 764 | { |
| 765 | // Fork off the process |
| 766 | pid_t Process = fork(); |
| 767 | if (Process < 0) |
| 768 | { |
| 769 | cerr << "FATAL -> Failed to fork." << endl; |
| 770 | exit(100); |
| 771 | } |
| 772 | |
| 773 | // Spawn the subprocess |
| 774 | if (Process == 0) |
| 775 | { |
| 776 | // Setup the signals |
| 777 | signal(SIGPIPE,SIG_DFL); |
| 778 | signal(SIGQUIT,SIG_DFL); |
| 779 | signal(SIGINT,SIG_DFL); |
| 780 | signal(SIGWINCH,SIG_DFL); |
| 781 | signal(SIGCONT,SIG_DFL); |
| 782 | signal(SIGTSTP,SIG_DFL); |
| 783 | |
| 784 | // Close all of our FDs - just in case |
| 785 | for (int K = 3; K != sysconf(_SC_OPEN_MAX); K++) |
| 786 | { |
| 787 | if(KeepFDs.find(K) == KeepFDs.end()) |
| 788 | fcntl(K,F_SETFD,FD_CLOEXEC); |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | return Process; |
| 793 | } |
| 794 | /*}}}*/ |
| 795 | // ExecWait - Fancy waitpid /*{{{*/ |
| 796 | // --------------------------------------------------------------------- |
| 797 | /* Waits for the given sub process. If Reap is set then no errors are |
| 798 | generated. Otherwise a failed subprocess will generate a proper descriptive |
| 799 | message */ |
| 800 | bool ExecWait(pid_t Pid,const char *Name,bool Reap) |
| 801 | { |
| 802 | if (Pid <= 1) |
| 803 | return true; |
| 804 | |
| 805 | // Wait and collect the error code |
| 806 | int Status; |
| 807 | while (waitpid(Pid,&Status,0) != Pid) |
| 808 | { |
| 809 | if (errno == EINTR) |
| 810 | continue; |
| 811 | |
| 812 | if (Reap == true) |
| 813 | return false; |
| 814 | |
| 815 | return _error->Error(_("Waited for %s but it wasn't there"),Name); |
| 816 | } |
| 817 | |
| 818 | |
| 819 | // Check for an error code. |
| 820 | if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0) |
| 821 | { |
| 822 | if (Reap == true) |
| 823 | return false; |
| 824 | if (WIFSIGNALED(Status) != 0) |
| 825 | { |
| 826 | if( WTERMSIG(Status) == SIGSEGV) |
| 827 | return _error->Error(_("Sub-process %s received a segmentation fault."),Name); |
| 828 | else |
| 829 | return _error->Error(_("Sub-process %s received signal %u."),Name, WTERMSIG(Status)); |
| 830 | } |
| 831 | |
| 832 | if (WIFEXITED(Status) != 0) |
| 833 | return _error->Error(_("Sub-process %s returned an error code (%u)"),Name,WEXITSTATUS(Status)); |
| 834 | |
| 835 | return _error->Error(_("Sub-process %s exited unexpectedly"),Name); |
| 836 | } |
| 837 | |
| 838 | return true; |
| 839 | } |
| 840 | /*}}}*/ |
| 841 | |
| 842 | class FileFdPrivate { /*{{{*/ |
| 843 | public: |
| 844 | #ifdef HAVE_ZLIB |
| 845 | gzFile gz; |
| 846 | #endif |
| 847 | #ifdef HAVE_BZ2 |
| 848 | BZFILE* bz2; |
| 849 | #endif |
| 850 | #ifdef HAVE_LZMA |
| 851 | struct LZMAFILE { |
| 852 | FILE* file; |
| 853 | uint8_t buffer[4096]; |
| 854 | lzma_stream stream; |
| 855 | lzma_ret err; |
| 856 | bool eof; |
| 857 | bool compressing; |
| 858 | |
| 859 | LZMAFILE() : file(NULL), eof(false), compressing(false) {} |
| 860 | ~LZMAFILE() { |
| 861 | if (compressing == true) |
| 862 | { |
| 863 | for (;;) { |
| 864 | stream.avail_out = sizeof(buffer)/sizeof(buffer[0]); |
| 865 | stream.next_out = buffer; |
| 866 | err = lzma_code(&stream, LZMA_FINISH); |
| 867 | if (err != LZMA_OK && err != LZMA_STREAM_END) |
| 868 | { |
| 869 | _error->Error("~LZMAFILE: Compress finalisation failed"); |
| 870 | break; |
| 871 | } |
| 872 | size_t const n = sizeof(buffer)/sizeof(buffer[0]) - stream.avail_out; |
| 873 | if (n && fwrite(buffer, 1, n, file) != n) |
| 874 | { |
| 875 | _error->Errno("~LZMAFILE",_("Write error")); |
| 876 | break; |
| 877 | } |
| 878 | if (err == LZMA_STREAM_END) |
| 879 | break; |
| 880 | } |
| 881 | } |
| 882 | lzma_end(&stream); |
| 883 | fclose(file); |
| 884 | } |
| 885 | }; |
| 886 | LZMAFILE* lzma; |
| 887 | #endif |
| 888 | int compressed_fd; |
| 889 | pid_t compressor_pid; |
| 890 | bool pipe; |
| 891 | APT::Configuration::Compressor compressor; |
| 892 | unsigned int openmode; |
| 893 | unsigned long long seekpos; |
| 894 | FileFdPrivate() : |
| 895 | #ifdef HAVE_ZLIB |
| 896 | gz(NULL), |
| 897 | #endif |
| 898 | #ifdef HAVE_BZ2 |
| 899 | bz2(NULL), |
| 900 | #endif |
| 901 | #ifdef HAVE_LZMA |
| 902 | lzma(NULL), |
| 903 | #endif |
| 904 | compressed_fd(-1), compressor_pid(-1), pipe(false), |
| 905 | openmode(0), seekpos(0) {}; |
| 906 | bool InternalClose(std::string const &FileName) |
| 907 | { |
| 908 | if (false) |
| 909 | /* dummy so that the rest can be 'else if's */; |
| 910 | #ifdef HAVE_ZLIB |
| 911 | else if (gz != NULL) { |
| 912 | int const e = gzclose(gz); |
| 913 | gz = NULL; |
| 914 | // gzdclose() on empty files always fails with "buffer error" here, ignore that |
| 915 | if (e != 0 && e != Z_BUF_ERROR) |
| 916 | return _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str()); |
| 917 | } |
| 918 | #endif |
| 919 | #ifdef HAVE_BZ2 |
| 920 | else if (bz2 != NULL) { |
| 921 | BZ2_bzclose(bz2); |
| 922 | bz2 = NULL; |
| 923 | } |
| 924 | #endif |
| 925 | #ifdef HAVE_LZMA |
| 926 | else if (lzma != NULL) { |
| 927 | delete lzma; |
| 928 | lzma = NULL; |
| 929 | } |
| 930 | #endif |
| 931 | return true; |
| 932 | } |
| 933 | bool CloseDown(std::string const &FileName) |
| 934 | { |
| 935 | bool const Res = InternalClose(FileName); |
| 936 | |
| 937 | if (compressor_pid > 0) |
| 938 | ExecWait(compressor_pid, "FileFdCompressor", true); |
| 939 | compressor_pid = -1; |
| 940 | |
| 941 | return Res; |
| 942 | } |
| 943 | bool InternalStream() const { |
| 944 | return false |
| 945 | #ifdef HAVE_BZ2 |
| 946 | || bz2 != NULL |
| 947 | #endif |
| 948 | #ifdef HAVE_LZMA |
| 949 | || lzma != NULL |
| 950 | #endif |
| 951 | ; |
| 952 | } |
| 953 | |
| 954 | |
| 955 | ~FileFdPrivate() { CloseDown(""); } |
| 956 | }; |
| 957 | /*}}}*/ |
| 958 | // FileFd::Open - Open a file /*{{{*/ |
| 959 | // --------------------------------------------------------------------- |
| 960 | /* The most commonly used open mode combinations are given with Mode */ |
| 961 | bool FileFd::Open(string FileName,unsigned int const Mode,CompressMode Compress, unsigned long const AccessMode) |
| 962 | { |
| 963 | if (Mode == ReadOnlyGzip) |
| 964 | return Open(FileName, ReadOnly, Gzip, AccessMode); |
| 965 | |
| 966 | if (Compress == Auto && (Mode & WriteOnly) == WriteOnly) |
| 967 | return FileFdError("Autodetection on %s only works in ReadOnly openmode!", FileName.c_str()); |
| 968 | |
| 969 | std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors(); |
| 970 | std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin(); |
| 971 | if (Compress == Auto) |
| 972 | { |
| 973 | for (; compressor != compressors.end(); ++compressor) |
| 974 | { |
| 975 | std::string file = FileName + compressor->Extension; |
| 976 | if (FileExists(file) == false) |
| 977 | continue; |
| 978 | FileName = file; |
| 979 | break; |
| 980 | } |
| 981 | } |
| 982 | else if (Compress == Extension) |
| 983 | { |
| 984 | std::string::size_type const found = FileName.find_last_of('.'); |
| 985 | std::string ext; |
| 986 | if (found != std::string::npos) |
| 987 | { |
| 988 | ext = FileName.substr(found); |
| 989 | if (ext == ".new" || ext == ".bak") |
| 990 | { |
| 991 | std::string::size_type const found2 = FileName.find_last_of('.', found - 1); |
| 992 | if (found2 != std::string::npos) |
| 993 | ext = FileName.substr(found2, found - found2); |
| 994 | else |
| 995 | ext.clear(); |
| 996 | } |
| 997 | } |
| 998 | for (; compressor != compressors.end(); ++compressor) |
| 999 | if (ext == compressor->Extension) |
| 1000 | break; |
| 1001 | // no matching extension - assume uncompressed (imagine files like 'example.org_Packages') |
| 1002 | if (compressor == compressors.end()) |
| 1003 | for (compressor = compressors.begin(); compressor != compressors.end(); ++compressor) |
| 1004 | if (compressor->Name == ".") |
| 1005 | break; |
| 1006 | } |
| 1007 | else |
| 1008 | { |
| 1009 | std::string name; |
| 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 | // Unreachable |
| 1020 | return FileFdError("Opening File %s in None, Auto or Extension should be already handled?!?", FileName.c_str()); |
| 1021 | } |
| 1022 | for (; compressor != compressors.end(); ++compressor) |
| 1023 | if (compressor->Name == name) |
| 1024 | break; |
| 1025 | if (compressor == compressors.end()) |
| 1026 | return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str()); |
| 1027 | } |
| 1028 | |
| 1029 | if (compressor == compressors.end()) |
| 1030 | return FileFdError("Can't find a match for specified compressor mode for file %s", FileName.c_str()); |
| 1031 | return Open(FileName, Mode, *compressor, AccessMode); |
| 1032 | } |
| 1033 | bool FileFd::Open(string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor, unsigned long const AccessMode) |
| 1034 | { |
| 1035 | Close(); |
| 1036 | Flags = AutoClose; |
| 1037 | |
| 1038 | if ((Mode & WriteOnly) != WriteOnly && (Mode & (Atomic | Create | Empty | Exclusive)) != 0) |
| 1039 | return FileFdError("ReadOnly mode for %s doesn't accept additional flags!", FileName.c_str()); |
| 1040 | if ((Mode & ReadWrite) == 0) |
| 1041 | return FileFdError("No openmode provided in FileFd::Open for %s", FileName.c_str()); |
| 1042 | |
| 1043 | if ((Mode & Atomic) == Atomic) |
| 1044 | { |
| 1045 | Flags |= Replace; |
| 1046 | } |
| 1047 | else if ((Mode & (Exclusive | Create)) == (Exclusive | Create)) |
| 1048 | { |
| 1049 | // for atomic, this will be done by rename in Close() |
| 1050 | unlink(FileName.c_str()); |
| 1051 | } |
| 1052 | if ((Mode & Empty) == Empty) |
| 1053 | { |
| 1054 | struct stat Buf; |
| 1055 | if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode)) |
| 1056 | unlink(FileName.c_str()); |
| 1057 | } |
| 1058 | |
| 1059 | int fileflags = 0; |
| 1060 | #define if_FLAGGED_SET(FLAG, MODE) if ((Mode & FLAG) == FLAG) fileflags |= MODE |
| 1061 | if_FLAGGED_SET(ReadWrite, O_RDWR); |
| 1062 | else if_FLAGGED_SET(ReadOnly, O_RDONLY); |
| 1063 | else if_FLAGGED_SET(WriteOnly, O_WRONLY); |
| 1064 | |
| 1065 | if_FLAGGED_SET(Create, O_CREAT); |
| 1066 | if_FLAGGED_SET(Empty, O_TRUNC); |
| 1067 | if_FLAGGED_SET(Exclusive, O_EXCL); |
| 1068 | #undef if_FLAGGED_SET |
| 1069 | |
| 1070 | // umask() will always set the umask and return the previous value, so |
| 1071 | // we first set the umask and then reset it to the old value |
| 1072 | mode_t CurrentUmask = umask(0); |
| 1073 | umask(CurrentUmask); |
| 1074 | // calculate the actual file permissions (just like open/creat) |
| 1075 | mode_t FilePermissions = (AccessMode & ~CurrentUmask); |
| 1076 | |
| 1077 | if ((Mode & Atomic) == Atomic) |
| 1078 | { |
| 1079 | char *name = strdup((FileName + ".XXXXXX").c_str()); |
| 1080 | |
| 1081 | if((iFd = mkstemp(name)) == -1) |
| 1082 | { |
| 1083 | free(name); |
| 1084 | return FileFdErrno("mkstemp", "Could not create temporary file for %s", FileName.c_str()); |
| 1085 | } |
| 1086 | |
| 1087 | TemporaryFileName = string(name); |
| 1088 | free(name); |
| 1089 | |
| 1090 | if(FilePermissions != 600 && fchmod(iFd, FilePermissions) == -1) |
| 1091 | return FileFdErrno("fchmod", "Could not change permissions for temporary file %s", TemporaryFileName.c_str()); |
| 1092 | } |
| 1093 | else |
| 1094 | iFd = open(FileName.c_str(), fileflags, FilePermissions); |
| 1095 | |
| 1096 | this->FileName = FileName; |
| 1097 | if (iFd == -1 || OpenInternDescriptor(Mode, compressor) == false) |
| 1098 | { |
| 1099 | if (iFd != -1) |
| 1100 | { |
| 1101 | close (iFd); |
| 1102 | iFd = -1; |
| 1103 | } |
| 1104 | return FileFdErrno("open",_("Could not open file %s"), FileName.c_str()); |
| 1105 | } |
| 1106 | |
| 1107 | SetCloseExec(iFd,true); |
| 1108 | return true; |
| 1109 | } |
| 1110 | /*}}}*/ |
| 1111 | // FileFd::OpenDescriptor - Open a filedescriptor /*{{{*/ |
| 1112 | // --------------------------------------------------------------------- |
| 1113 | /* */ |
| 1114 | bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose) |
| 1115 | { |
| 1116 | std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors(); |
| 1117 | std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin(); |
| 1118 | std::string name; |
| 1119 | |
| 1120 | // compat with the old API |
| 1121 | if (Mode == ReadOnlyGzip && Compress == None) |
| 1122 | Compress = Gzip; |
| 1123 | |
| 1124 | switch (Compress) |
| 1125 | { |
| 1126 | case None: name = "."; break; |
| 1127 | case Gzip: name = "gzip"; break; |
| 1128 | case Bzip2: name = "bzip2"; break; |
| 1129 | case Lzma: name = "lzma"; break; |
| 1130 | case Xz: name = "xz"; break; |
| 1131 | case Auto: |
| 1132 | case Extension: |
| 1133 | if (AutoClose == true && Fd != -1) |
| 1134 | close(Fd); |
| 1135 | return FileFdError("Opening Fd %d in Auto or Extension compression mode is not supported", Fd); |
| 1136 | } |
| 1137 | for (; compressor != compressors.end(); ++compressor) |
| 1138 | if (compressor->Name == name) |
| 1139 | break; |
| 1140 | if (compressor == compressors.end()) |
| 1141 | { |
| 1142 | if (AutoClose == true && Fd != -1) |
| 1143 | close(Fd); |
| 1144 | return FileFdError("Can't find a configured compressor %s for file %s", name.c_str(), FileName.c_str()); |
| 1145 | } |
| 1146 | return OpenDescriptor(Fd, Mode, *compressor, AutoClose); |
| 1147 | } |
| 1148 | bool FileFd::OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose) |
| 1149 | { |
| 1150 | Close(); |
| 1151 | Flags = (AutoClose) ? FileFd::AutoClose : 0; |
| 1152 | iFd = Fd; |
| 1153 | this->FileName = ""; |
| 1154 | if (OpenInternDescriptor(Mode, compressor) == false) |
| 1155 | { |
| 1156 | if (iFd != -1 && ( |
| 1157 | (Flags & Compressed) == Compressed || |
| 1158 | AutoClose == true)) |
| 1159 | { |
| 1160 | close (iFd); |
| 1161 | iFd = -1; |
| 1162 | } |
| 1163 | return FileFdError(_("Could not open file descriptor %d"), Fd); |
| 1164 | } |
| 1165 | return true; |
| 1166 | } |
| 1167 | bool FileFd::OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor) |
| 1168 | { |
| 1169 | if (iFd == -1) |
| 1170 | return false; |
| 1171 | if (compressor.Name == "." || compressor.Binary.empty() == true) |
| 1172 | return true; |
| 1173 | |
| 1174 | #if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA |
| 1175 | // the API to open files is similar, so setup to avoid code duplicates later |
| 1176 | // and while at it ensure that we close before opening (if its a reopen) |
| 1177 | void* (*compress_open)(int, const char *) = NULL; |
| 1178 | if (false) |
| 1179 | /* dummy so that the rest can be 'else if's */; |
| 1180 | #define APT_COMPRESS_INIT(NAME,OPEN) \ |
| 1181 | else if (compressor.Name == NAME) \ |
| 1182 | { \ |
| 1183 | compress_open = (void*(*)(int, const char *)) OPEN; \ |
| 1184 | if (d != NULL) d->InternalClose(FileName); \ |
| 1185 | } |
| 1186 | #ifdef HAVE_ZLIB |
| 1187 | APT_COMPRESS_INIT("gzip", gzdopen) |
| 1188 | #endif |
| 1189 | #ifdef HAVE_BZ2 |
| 1190 | APT_COMPRESS_INIT("bzip2", BZ2_bzdopen) |
| 1191 | #endif |
| 1192 | #ifdef HAVE_LZMA |
| 1193 | APT_COMPRESS_INIT("xz", fdopen) |
| 1194 | APT_COMPRESS_INIT("lzma", fdopen) |
| 1195 | #endif |
| 1196 | #undef APT_COMPRESS_INIT |
| 1197 | #endif |
| 1198 | |
| 1199 | if (d == NULL) |
| 1200 | { |
| 1201 | d = new FileFdPrivate(); |
| 1202 | d->openmode = Mode; |
| 1203 | d->compressor = compressor; |
| 1204 | #if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA |
| 1205 | if ((Flags & AutoClose) != AutoClose && compress_open != NULL) |
| 1206 | { |
| 1207 | // Need to duplicate fd here or gz/bz2 close for cleanup will close the fd as well |
| 1208 | int const internFd = dup(iFd); |
| 1209 | if (internFd == -1) |
| 1210 | return FileFdErrno("OpenInternDescriptor", _("Could not open file descriptor %d"), iFd); |
| 1211 | iFd = internFd; |
| 1212 | } |
| 1213 | #endif |
| 1214 | } |
| 1215 | |
| 1216 | #if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA |
| 1217 | if (compress_open != NULL) |
| 1218 | { |
| 1219 | void* compress_struct = NULL; |
| 1220 | if ((Mode & ReadWrite) == ReadWrite) |
| 1221 | compress_struct = compress_open(iFd, "r+"); |
| 1222 | else if ((Mode & WriteOnly) == WriteOnly) |
| 1223 | compress_struct = compress_open(iFd, "w"); |
| 1224 | else |
| 1225 | compress_struct = compress_open(iFd, "r"); |
| 1226 | if (compress_struct == NULL) |
| 1227 | return false; |
| 1228 | |
| 1229 | if (false) |
| 1230 | /* dummy so that the rest can be 'else if's */; |
| 1231 | #ifdef HAVE_ZLIB |
| 1232 | else if (compressor.Name == "gzip") |
| 1233 | d->gz = (gzFile) compress_struct; |
| 1234 | #endif |
| 1235 | #ifdef HAVE_BZ2 |
| 1236 | else if (compressor.Name == "bzip2") |
| 1237 | d->bz2 = (BZFILE*) compress_struct; |
| 1238 | #endif |
| 1239 | #ifdef HAVE_LZMA |
| 1240 | else if (compressor.Name == "xz" || compressor.Name == "lzma") |
| 1241 | { |
| 1242 | uint32_t const xzlevel = 6; |
| 1243 | uint64_t const memlimit = UINT64_MAX; |
| 1244 | if (d->lzma == NULL) |
| 1245 | d->lzma = new FileFdPrivate::LZMAFILE; |
| 1246 | d->lzma->file = (FILE*) compress_struct; |
| 1247 | d->lzma->stream = LZMA_STREAM_INIT; |
| 1248 | |
| 1249 | if ((Mode & ReadWrite) == ReadWrite) |
| 1250 | return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str()); |
| 1251 | |
| 1252 | if ((Mode & WriteOnly) == WriteOnly) |
| 1253 | { |
| 1254 | if (compressor.Name == "xz") |
| 1255 | { |
| 1256 | if (lzma_easy_encoder(&d->lzma->stream, xzlevel, LZMA_CHECK_CRC32) != LZMA_OK) |
| 1257 | return false; |
| 1258 | } |
| 1259 | else |
| 1260 | { |
| 1261 | lzma_options_lzma options; |
| 1262 | lzma_lzma_preset(&options, xzlevel); |
| 1263 | if (lzma_alone_encoder(&d->lzma->stream, &options) != LZMA_OK) |
| 1264 | return false; |
| 1265 | } |
| 1266 | d->lzma->compressing = true; |
| 1267 | } |
| 1268 | else |
| 1269 | { |
| 1270 | if (compressor.Name == "xz") |
| 1271 | { |
| 1272 | if (lzma_auto_decoder(&d->lzma->stream, memlimit, 0) != LZMA_OK) |
| 1273 | return false; |
| 1274 | } |
| 1275 | else |
| 1276 | { |
| 1277 | if (lzma_alone_decoder(&d->lzma->stream, memlimit) != LZMA_OK) |
| 1278 | return false; |
| 1279 | } |
| 1280 | d->lzma->compressing = false; |
| 1281 | } |
| 1282 | } |
| 1283 | #endif |
| 1284 | Flags |= Compressed; |
| 1285 | return true; |
| 1286 | } |
| 1287 | #endif |
| 1288 | |
| 1289 | // collect zombies here in case we reopen |
| 1290 | if (d->compressor_pid > 0) |
| 1291 | ExecWait(d->compressor_pid, "FileFdCompressor", true); |
| 1292 | |
| 1293 | if ((Mode & ReadWrite) == ReadWrite) |
| 1294 | return FileFdError("ReadWrite mode is not supported for file %s", FileName.c_str()); |
| 1295 | |
| 1296 | bool const Comp = (Mode & WriteOnly) == WriteOnly; |
| 1297 | if (Comp == false) |
| 1298 | { |
| 1299 | // Handle 'decompression' of empty files |
| 1300 | struct stat Buf; |
| 1301 | fstat(iFd, &Buf); |
| 1302 | if (Buf.st_size == 0 && S_ISFIFO(Buf.st_mode) == false) |
| 1303 | return true; |
| 1304 | |
| 1305 | // We don't need the file open - instead let the compressor open it |
| 1306 | // as he properly knows better how to efficiently read from 'his' file |
| 1307 | if (FileName.empty() == false) |
| 1308 | { |
| 1309 | close(iFd); |
| 1310 | iFd = -1; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | // Create a data pipe |
| 1315 | int Pipe[2] = {-1,-1}; |
| 1316 | if (pipe(Pipe) != 0) |
| 1317 | return FileFdErrno("pipe",_("Failed to create subprocess IPC")); |
| 1318 | for (int J = 0; J != 2; J++) |
| 1319 | SetCloseExec(Pipe[J],true); |
| 1320 | |
| 1321 | d->compressed_fd = iFd; |
| 1322 | d->pipe = true; |
| 1323 | |
| 1324 | if (Comp == true) |
| 1325 | iFd = Pipe[1]; |
| 1326 | else |
| 1327 | iFd = Pipe[0]; |
| 1328 | |
| 1329 | // The child.. |
| 1330 | d->compressor_pid = ExecFork(); |
| 1331 | if (d->compressor_pid == 0) |
| 1332 | { |
| 1333 | if (Comp == true) |
| 1334 | { |
| 1335 | dup2(d->compressed_fd,STDOUT_FILENO); |
| 1336 | dup2(Pipe[0],STDIN_FILENO); |
| 1337 | } |
| 1338 | else |
| 1339 | { |
| 1340 | if (d->compressed_fd != -1) |
| 1341 | dup2(d->compressed_fd,STDIN_FILENO); |
| 1342 | dup2(Pipe[1],STDOUT_FILENO); |
| 1343 | } |
| 1344 | int const nullfd = open("/dev/null", O_WRONLY); |
| 1345 | if (nullfd != -1) |
| 1346 | { |
| 1347 | dup2(nullfd,STDERR_FILENO); |
| 1348 | close(nullfd); |
| 1349 | } |
| 1350 | |
| 1351 | SetCloseExec(STDOUT_FILENO,false); |
| 1352 | SetCloseExec(STDIN_FILENO,false); |
| 1353 | |
| 1354 | std::vector<char const*> Args; |
| 1355 | Args.push_back(compressor.Binary.c_str()); |
| 1356 | std::vector<std::string> const * const addArgs = |
| 1357 | (Comp == true) ? &(compressor.CompressArgs) : &(compressor.UncompressArgs); |
| 1358 | for (std::vector<std::string>::const_iterator a = addArgs->begin(); |
| 1359 | a != addArgs->end(); ++a) |
| 1360 | Args.push_back(a->c_str()); |
| 1361 | if (Comp == false && FileName.empty() == false) |
| 1362 | { |
| 1363 | Args.push_back("--stdout"); |
| 1364 | if (TemporaryFileName.empty() == false) |
| 1365 | Args.push_back(TemporaryFileName.c_str()); |
| 1366 | else |
| 1367 | Args.push_back(FileName.c_str()); |
| 1368 | } |
| 1369 | Args.push_back(NULL); |
| 1370 | |
| 1371 | execvp(Args[0],(char **)&Args[0]); |
| 1372 | cerr << _("Failed to exec compressor ") << Args[0] << endl; |
| 1373 | _exit(100); |
| 1374 | } |
| 1375 | if (Comp == true) |
| 1376 | close(Pipe[0]); |
| 1377 | else |
| 1378 | close(Pipe[1]); |
| 1379 | |
| 1380 | return true; |
| 1381 | } |
| 1382 | /*}}}*/ |
| 1383 | // FileFd::~File - Closes the file /*{{{*/ |
| 1384 | // --------------------------------------------------------------------- |
| 1385 | /* If the proper modes are selected then we close the Fd and possibly |
| 1386 | unlink the file on error. */ |
| 1387 | FileFd::~FileFd() |
| 1388 | { |
| 1389 | Close(); |
| 1390 | if (d != NULL) |
| 1391 | d->CloseDown(FileName); |
| 1392 | delete d; |
| 1393 | d = NULL; |
| 1394 | } |
| 1395 | /*}}}*/ |
| 1396 | // FileFd::Read - Read a bit of the file /*{{{*/ |
| 1397 | // --------------------------------------------------------------------- |
| 1398 | /* We are careful to handle interruption by a signal while reading |
| 1399 | gracefully. */ |
| 1400 | bool FileFd::Read(void *To,unsigned long long Size,unsigned long long *Actual) |
| 1401 | { |
| 1402 | ssize_t Res; |
| 1403 | errno = 0; |
| 1404 | if (Actual != 0) |
| 1405 | *Actual = 0; |
| 1406 | *((char *)To) = '\0'; |
| 1407 | do |
| 1408 | { |
| 1409 | if (false) |
| 1410 | /* dummy so that the rest can be 'else if's */; |
| 1411 | #ifdef HAVE_ZLIB |
| 1412 | else if (d != NULL && d->gz != NULL) |
| 1413 | Res = gzread(d->gz,To,Size); |
| 1414 | #endif |
| 1415 | #ifdef HAVE_BZ2 |
| 1416 | else if (d != NULL && d->bz2 != NULL) |
| 1417 | Res = BZ2_bzread(d->bz2,To,Size); |
| 1418 | #endif |
| 1419 | #ifdef HAVE_LZMA |
| 1420 | else if (d != NULL && d->lzma != NULL) |
| 1421 | { |
| 1422 | if (d->lzma->eof == true) |
| 1423 | break; |
| 1424 | |
| 1425 | d->lzma->stream.next_out = (uint8_t *) To; |
| 1426 | d->lzma->stream.avail_out = Size; |
| 1427 | if (d->lzma->stream.avail_in == 0) |
| 1428 | { |
| 1429 | d->lzma->stream.next_in = d->lzma->buffer; |
| 1430 | d->lzma->stream.avail_in = fread(d->lzma->buffer, 1, sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]), d->lzma->file); |
| 1431 | } |
| 1432 | d->lzma->err = lzma_code(&d->lzma->stream, LZMA_RUN); |
| 1433 | if (d->lzma->err == LZMA_STREAM_END) |
| 1434 | { |
| 1435 | d->lzma->eof = true; |
| 1436 | Res = Size - d->lzma->stream.avail_out; |
| 1437 | } |
| 1438 | else if (d->lzma->err != LZMA_OK) |
| 1439 | { |
| 1440 | Res = -1; |
| 1441 | errno = 0; |
| 1442 | } |
| 1443 | else |
| 1444 | { |
| 1445 | Res = Size - d->lzma->stream.avail_out; |
| 1446 | if (Res == 0) |
| 1447 | { |
| 1448 | // lzma run was okay, but produced no output… |
| 1449 | Res = -1; |
| 1450 | errno = EINTR; |
| 1451 | } |
| 1452 | } |
| 1453 | } |
| 1454 | #endif |
| 1455 | else |
| 1456 | Res = read(iFd,To,Size); |
| 1457 | |
| 1458 | if (Res < 0) |
| 1459 | { |
| 1460 | if (errno == EINTR) |
| 1461 | { |
| 1462 | // trick the while-loop into running again |
| 1463 | Res = 1; |
| 1464 | errno = 0; |
| 1465 | continue; |
| 1466 | } |
| 1467 | if (false) |
| 1468 | /* dummy so that the rest can be 'else if's */; |
| 1469 | #ifdef HAVE_ZLIB |
| 1470 | else if (d != NULL && d->gz != NULL) |
| 1471 | { |
| 1472 | int err; |
| 1473 | char const * const errmsg = gzerror(d->gz, &err); |
| 1474 | if (err != Z_ERRNO) |
| 1475 | return FileFdError("gzread: %s (%d: %s)", _("Read error"), err, errmsg); |
| 1476 | } |
| 1477 | #endif |
| 1478 | #ifdef HAVE_BZ2 |
| 1479 | else if (d != NULL && d->bz2 != NULL) |
| 1480 | { |
| 1481 | int err; |
| 1482 | char const * const errmsg = BZ2_bzerror(d->bz2, &err); |
| 1483 | if (err != BZ_IO_ERROR) |
| 1484 | return FileFdError("BZ2_bzread: %s (%d: %s)", _("Read error"), err, errmsg); |
| 1485 | } |
| 1486 | #endif |
| 1487 | #ifdef HAVE_LZMA |
| 1488 | else if (d != NULL && d->lzma != NULL) |
| 1489 | return FileFdError("lzma_read: %s (%d)", _("Read error"), d->lzma->err); |
| 1490 | #endif |
| 1491 | return FileFdErrno("read",_("Read error")); |
| 1492 | } |
| 1493 | |
| 1494 | To = (char *)To + Res; |
| 1495 | Size -= Res; |
| 1496 | if (d != NULL) |
| 1497 | d->seekpos += Res; |
| 1498 | if (Actual != 0) |
| 1499 | *Actual += Res; |
| 1500 | } |
| 1501 | while (Res > 0 && Size > 0); |
| 1502 | |
| 1503 | if (Size == 0) |
| 1504 | return true; |
| 1505 | |
| 1506 | // Eof handling |
| 1507 | if (Actual != 0) |
| 1508 | { |
| 1509 | Flags |= HitEof; |
| 1510 | return true; |
| 1511 | } |
| 1512 | |
| 1513 | return FileFdError(_("read, still have %llu to read but none left"), Size); |
| 1514 | } |
| 1515 | /*}}}*/ |
| 1516 | // FileFd::ReadLine - Read a complete line from the file /*{{{*/ |
| 1517 | // --------------------------------------------------------------------- |
| 1518 | /* Beware: This method can be quiet slow for big buffers on UNcompressed |
| 1519 | files because of the naive implementation! */ |
| 1520 | char* FileFd::ReadLine(char *To, unsigned long long const Size) |
| 1521 | { |
| 1522 | *To = '\0'; |
| 1523 | #ifdef HAVE_ZLIB |
| 1524 | if (d != NULL && d->gz != NULL) |
| 1525 | return gzgets(d->gz, To, Size); |
| 1526 | #endif |
| 1527 | |
| 1528 | unsigned long long read = 0; |
| 1529 | while ((Size - 1) != read) |
| 1530 | { |
| 1531 | unsigned long long done = 0; |
| 1532 | if (Read(To + read, 1, &done) == false) |
| 1533 | return NULL; |
| 1534 | if (done == 0) |
| 1535 | break; |
| 1536 | if (To[read++] == '\n') |
| 1537 | break; |
| 1538 | } |
| 1539 | if (read == 0) |
| 1540 | return NULL; |
| 1541 | To[read] = '\0'; |
| 1542 | return To; |
| 1543 | } |
| 1544 | /*}}}*/ |
| 1545 | // FileFd::Write - Write to the file /*{{{*/ |
| 1546 | // --------------------------------------------------------------------- |
| 1547 | /* */ |
| 1548 | bool FileFd::Write(const void *From,unsigned long long Size) |
| 1549 | { |
| 1550 | ssize_t Res; |
| 1551 | errno = 0; |
| 1552 | do |
| 1553 | { |
| 1554 | if (false) |
| 1555 | /* dummy so that the rest can be 'else if's */; |
| 1556 | #ifdef HAVE_ZLIB |
| 1557 | else if (d != NULL && d->gz != NULL) |
| 1558 | Res = gzwrite(d->gz,From,Size); |
| 1559 | #endif |
| 1560 | #ifdef HAVE_BZ2 |
| 1561 | else if (d != NULL && d->bz2 != NULL) |
| 1562 | Res = BZ2_bzwrite(d->bz2,(void*)From,Size); |
| 1563 | #endif |
| 1564 | #ifdef HAVE_LZMA |
| 1565 | else if (d != NULL && d->lzma != NULL) |
| 1566 | { |
| 1567 | d->lzma->stream.next_in = (uint8_t *)From; |
| 1568 | d->lzma->stream.avail_in = Size; |
| 1569 | d->lzma->stream.next_out = d->lzma->buffer; |
| 1570 | d->lzma->stream.avail_out = sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]); |
| 1571 | d->lzma->err = lzma_code(&d->lzma->stream, LZMA_RUN); |
| 1572 | if (d->lzma->err != LZMA_OK) |
| 1573 | return false; |
| 1574 | size_t const n = sizeof(d->lzma->buffer)/sizeof(d->lzma->buffer[0]) - d->lzma->stream.avail_out; |
| 1575 | size_t const m = (n == 0) ? 0 : fwrite(d->lzma->buffer, 1, n, d->lzma->file); |
| 1576 | if (m != n) |
| 1577 | Res = -1; |
| 1578 | else |
| 1579 | Res = Size - d->lzma->stream.avail_in; |
| 1580 | } |
| 1581 | #endif |
| 1582 | else |
| 1583 | Res = write(iFd,From,Size); |
| 1584 | |
| 1585 | if (Res < 0 && errno == EINTR) |
| 1586 | continue; |
| 1587 | if (Res < 0) |
| 1588 | { |
| 1589 | if (false) |
| 1590 | /* dummy so that the rest can be 'else if's */; |
| 1591 | #ifdef HAVE_ZLIB |
| 1592 | else if (d != NULL && d->gz != NULL) |
| 1593 | { |
| 1594 | int err; |
| 1595 | char const * const errmsg = gzerror(d->gz, &err); |
| 1596 | if (err != Z_ERRNO) |
| 1597 | return FileFdError("gzwrite: %s (%d: %s)", _("Write error"), err, errmsg); |
| 1598 | } |
| 1599 | #endif |
| 1600 | #ifdef HAVE_BZ2 |
| 1601 | else if (d != NULL && d->bz2 != NULL) |
| 1602 | { |
| 1603 | int err; |
| 1604 | char const * const errmsg = BZ2_bzerror(d->bz2, &err); |
| 1605 | if (err != BZ_IO_ERROR) |
| 1606 | return FileFdError("BZ2_bzwrite: %s (%d: %s)", _("Write error"), err, errmsg); |
| 1607 | } |
| 1608 | #endif |
| 1609 | #ifdef HAVE_LZMA |
| 1610 | else if (d != NULL && d->lzma != NULL) |
| 1611 | return FileFdErrno("lzma_fwrite", _("Write error")); |
| 1612 | #endif |
| 1613 | return FileFdErrno("write",_("Write error")); |
| 1614 | } |
| 1615 | |
| 1616 | From = (char const *)From + Res; |
| 1617 | Size -= Res; |
| 1618 | if (d != NULL) |
| 1619 | d->seekpos += Res; |
| 1620 | } |
| 1621 | while (Res > 0 && Size > 0); |
| 1622 | |
| 1623 | if (Size == 0) |
| 1624 | return true; |
| 1625 | |
| 1626 | return FileFdError(_("write, still have %llu to write but couldn't"), Size); |
| 1627 | } |
| 1628 | bool FileFd::Write(int Fd, const void *From, unsigned long long Size) |
| 1629 | { |
| 1630 | ssize_t Res; |
| 1631 | errno = 0; |
| 1632 | do |
| 1633 | { |
| 1634 | Res = write(Fd,From,Size); |
| 1635 | if (Res < 0 && errno == EINTR) |
| 1636 | continue; |
| 1637 | if (Res < 0) |
| 1638 | return _error->Errno("write",_("Write error")); |
| 1639 | |
| 1640 | From = (char const *)From + Res; |
| 1641 | Size -= Res; |
| 1642 | } |
| 1643 | while (Res > 0 && Size > 0); |
| 1644 | |
| 1645 | if (Size == 0) |
| 1646 | return true; |
| 1647 | |
| 1648 | return _error->Error(_("write, still have %llu to write but couldn't"), Size); |
| 1649 | } |
| 1650 | /*}}}*/ |
| 1651 | // FileFd::Seek - Seek in the file /*{{{*/ |
| 1652 | // --------------------------------------------------------------------- |
| 1653 | /* */ |
| 1654 | bool FileFd::Seek(unsigned long long To) |
| 1655 | { |
| 1656 | if (d != NULL && (d->pipe == true || d->InternalStream() == true)) |
| 1657 | { |
| 1658 | // Our poor man seeking in pipes is costly, so try to avoid it |
| 1659 | unsigned long long seekpos = Tell(); |
| 1660 | if (seekpos == To) |
| 1661 | return true; |
| 1662 | else if (seekpos < To) |
| 1663 | return Skip(To - seekpos); |
| 1664 | |
| 1665 | if ((d->openmode & ReadOnly) != ReadOnly) |
| 1666 | return FileFdError("Reopen is only implemented for read-only files!"); |
| 1667 | d->InternalClose(FileName); |
| 1668 | if (iFd != -1) |
| 1669 | close(iFd); |
| 1670 | iFd = -1; |
| 1671 | if (TemporaryFileName.empty() == false) |
| 1672 | iFd = open(TemporaryFileName.c_str(), O_RDONLY); |
| 1673 | else if (FileName.empty() == false) |
| 1674 | iFd = open(FileName.c_str(), O_RDONLY); |
| 1675 | else |
| 1676 | { |
| 1677 | if (d->compressed_fd > 0) |
| 1678 | if (lseek(d->compressed_fd, 0, SEEK_SET) != 0) |
| 1679 | iFd = d->compressed_fd; |
| 1680 | if (iFd < 0) |
| 1681 | return FileFdError("Reopen is not implemented for pipes opened with FileFd::OpenDescriptor()!"); |
| 1682 | } |
| 1683 | |
| 1684 | if (OpenInternDescriptor(d->openmode, d->compressor) == false) |
| 1685 | return FileFdError("Seek on file %s because it couldn't be reopened", FileName.c_str()); |
| 1686 | |
| 1687 | if (To != 0) |
| 1688 | return Skip(To); |
| 1689 | |
| 1690 | d->seekpos = To; |
| 1691 | return true; |
| 1692 | } |
| 1693 | off_t res; |
| 1694 | #ifdef HAVE_ZLIB |
| 1695 | if (d != NULL && d->gz) |
| 1696 | res = gzseek(d->gz,To,SEEK_SET); |
| 1697 | else |
| 1698 | #endif |
| 1699 | res = lseek(iFd,To,SEEK_SET); |
| 1700 | if (res != (off_t)To) |
| 1701 | return FileFdError("Unable to seek to %llu", To); |
| 1702 | |
| 1703 | if (d != NULL) |
| 1704 | d->seekpos = To; |
| 1705 | return true; |
| 1706 | } |
| 1707 | /*}}}*/ |
| 1708 | // FileFd::Skip - Seek in the file /*{{{*/ |
| 1709 | // --------------------------------------------------------------------- |
| 1710 | /* */ |
| 1711 | bool FileFd::Skip(unsigned long long Over) |
| 1712 | { |
| 1713 | if (d != NULL && (d->pipe == true || d->InternalStream() == true)) |
| 1714 | { |
| 1715 | d->seekpos += Over; |
| 1716 | char buffer[1024]; |
| 1717 | while (Over != 0) |
| 1718 | { |
| 1719 | unsigned long long toread = std::min((unsigned long long) sizeof(buffer), Over); |
| 1720 | if (Read(buffer, toread) == false) |
| 1721 | return FileFdError("Unable to seek ahead %llu",Over); |
| 1722 | Over -= toread; |
| 1723 | } |
| 1724 | return true; |
| 1725 | } |
| 1726 | |
| 1727 | off_t res; |
| 1728 | #ifdef HAVE_ZLIB |
| 1729 | if (d != NULL && d->gz != NULL) |
| 1730 | res = gzseek(d->gz,Over,SEEK_CUR); |
| 1731 | else |
| 1732 | #endif |
| 1733 | res = lseek(iFd,Over,SEEK_CUR); |
| 1734 | if (res < 0) |
| 1735 | return FileFdError("Unable to seek ahead %llu",Over); |
| 1736 | if (d != NULL) |
| 1737 | d->seekpos = res; |
| 1738 | |
| 1739 | return true; |
| 1740 | } |
| 1741 | /*}}}*/ |
| 1742 | // FileFd::Truncate - Truncate the file /*{{{*/ |
| 1743 | // --------------------------------------------------------------------- |
| 1744 | /* */ |
| 1745 | bool FileFd::Truncate(unsigned long long To) |
| 1746 | { |
| 1747 | // truncating /dev/null is always successful - as we get an error otherwise |
| 1748 | if (To == 0 && FileName == "/dev/null") |
| 1749 | return true; |
| 1750 | #if defined HAVE_ZLIB || defined HAVE_BZ2 || defined HAVE_LZMA |
| 1751 | if (d != NULL && (d->InternalStream() == true |
| 1752 | #ifdef HAVE_ZLIB |
| 1753 | || d->gz != NULL |
| 1754 | #endif |
| 1755 | )) |
| 1756 | return FileFdError("Truncating compressed files is not implemented (%s)", FileName.c_str()); |
| 1757 | #endif |
| 1758 | if (ftruncate(iFd,To) != 0) |
| 1759 | return FileFdError("Unable to truncate to %llu",To); |
| 1760 | |
| 1761 | return true; |
| 1762 | } |
| 1763 | /*}}}*/ |
| 1764 | // FileFd::Tell - Current seek position /*{{{*/ |
| 1765 | // --------------------------------------------------------------------- |
| 1766 | /* */ |
| 1767 | unsigned long long FileFd::Tell() |
| 1768 | { |
| 1769 | // In theory, we could just return seekpos here always instead of |
| 1770 | // seeking around, but not all users of FileFd use always Seek() and co |
| 1771 | // so d->seekpos isn't always true and we can just use it as a hint if |
| 1772 | // we have nothing else, but not always as an authority… |
| 1773 | if (d != NULL && (d->pipe == true || d->InternalStream() == true)) |
| 1774 | return d->seekpos; |
| 1775 | |
| 1776 | off_t Res; |
| 1777 | #ifdef HAVE_ZLIB |
| 1778 | if (d != NULL && d->gz != NULL) |
| 1779 | Res = gztell(d->gz); |
| 1780 | else |
| 1781 | #endif |
| 1782 | Res = lseek(iFd,0,SEEK_CUR); |
| 1783 | if (Res == (off_t)-1) |
| 1784 | FileFdErrno("lseek","Failed to determine the current file position"); |
| 1785 | if (d != NULL) |
| 1786 | d->seekpos = Res; |
| 1787 | return Res; |
| 1788 | } |
| 1789 | /*}}}*/ |
| 1790 | static bool StatFileFd(char const * const msg, int const iFd, std::string const &FileName, struct stat &Buf, FileFdPrivate * const d) /*{{{*/ |
| 1791 | { |
| 1792 | bool ispipe = (d != NULL && d->pipe == true); |
| 1793 | if (ispipe == false) |
| 1794 | { |
| 1795 | if (fstat(iFd,&Buf) != 0) |
| 1796 | // higher-level code will generate more meaningful messages, |
| 1797 | // even translated this would be meaningless for users |
| 1798 | return _error->Errno("fstat", "Unable to determine %s for fd %i", msg, iFd); |
| 1799 | ispipe = S_ISFIFO(Buf.st_mode); |
| 1800 | } |
| 1801 | |
| 1802 | // for compressor pipes st_size is undefined and at 'best' zero |
| 1803 | if (ispipe == true) |
| 1804 | { |
| 1805 | // we set it here, too, as we get the info here for free |
| 1806 | // in theory the Open-methods should take care of it already |
| 1807 | if (d != NULL) |
| 1808 | d->pipe = true; |
| 1809 | if (stat(FileName.c_str(), &Buf) != 0) |
| 1810 | return _error->Errno("fstat", "Unable to determine %s for file %s", msg, FileName.c_str()); |
| 1811 | } |
| 1812 | return true; |
| 1813 | } |
| 1814 | /*}}}*/ |
| 1815 | // FileFd::FileSize - Return the size of the file /*{{{*/ |
| 1816 | unsigned long long FileFd::FileSize() |
| 1817 | { |
| 1818 | struct stat Buf; |
| 1819 | if (StatFileFd("file size", iFd, FileName, Buf, d) == false) |
| 1820 | { |
| 1821 | Flags |= Fail; |
| 1822 | return 0; |
| 1823 | } |
| 1824 | return Buf.st_size; |
| 1825 | } |
| 1826 | /*}}}*/ |
| 1827 | // FileFd::ModificationTime - Return the time of last touch /*{{{*/ |
| 1828 | time_t FileFd::ModificationTime() |
| 1829 | { |
| 1830 | struct stat Buf; |
| 1831 | if (StatFileFd("modification time", iFd, FileName, Buf, d) == false) |
| 1832 | { |
| 1833 | Flags |= Fail; |
| 1834 | return 0; |
| 1835 | } |
| 1836 | return Buf.st_mtime; |
| 1837 | } |
| 1838 | /*}}}*/ |
| 1839 | // FileFd::Size - Return the size of the content in the file /*{{{*/ |
| 1840 | // --------------------------------------------------------------------- |
| 1841 | /* */ |
| 1842 | unsigned long long FileFd::Size() |
| 1843 | { |
| 1844 | unsigned long long size = FileSize(); |
| 1845 | |
| 1846 | // for compressor pipes st_size is undefined and at 'best' zero, |
| 1847 | // so we 'read' the content and 'seek' back - see there |
| 1848 | if (d != NULL && (d->pipe == true || (d->InternalStream() == true && size > 0))) |
| 1849 | { |
| 1850 | unsigned long long const oldSeek = Tell(); |
| 1851 | char ignore[1000]; |
| 1852 | unsigned long long read = 0; |
| 1853 | do { |
| 1854 | if (Read(ignore, sizeof(ignore), &read) == false) |
| 1855 | { |
| 1856 | Seek(oldSeek); |
| 1857 | return 0; |
| 1858 | } |
| 1859 | } while(read != 0); |
| 1860 | size = Tell(); |
| 1861 | Seek(oldSeek); |
| 1862 | } |
| 1863 | #ifdef HAVE_ZLIB |
| 1864 | // only check gzsize if we are actually a gzip file, just checking for |
| 1865 | // "gz" is not sufficient as uncompressed files could be opened with |
| 1866 | // gzopen in "direct" mode as well |
| 1867 | else if (d != NULL && d->gz && !gzdirect(d->gz) && size > 0) |
| 1868 | { |
| 1869 | off_t const oldPos = lseek(iFd,0,SEEK_CUR); |
| 1870 | /* unfortunately zlib.h doesn't provide a gzsize(), so we have to do |
| 1871 | * this ourselves; the original (uncompressed) file size is the last 32 |
| 1872 | * bits of the file */ |
| 1873 | // FIXME: Size for gz-files is limited by 32bit… no largefile support |
| 1874 | if (lseek(iFd, -4, SEEK_END) < 0) |
| 1875 | { |
| 1876 | FileFdErrno("lseek","Unable to seek to end of gzipped file"); |
| 1877 | return 0; |
| 1878 | } |
| 1879 | size = 0; |
| 1880 | if (read(iFd, &size, 4) != 4) |
| 1881 | { |
| 1882 | FileFdErrno("read","Unable to read original size of gzipped file"); |
| 1883 | return 0; |
| 1884 | } |
| 1885 | |
| 1886 | #ifdef WORDS_BIGENDIAN |
| 1887 | uint32_t tmp_size = size; |
| 1888 | uint8_t const * const p = (uint8_t const * const) &tmp_size; |
| 1889 | tmp_size = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]; |
| 1890 | size = tmp_size; |
| 1891 | #endif |
| 1892 | |
| 1893 | if (lseek(iFd, oldPos, SEEK_SET) < 0) |
| 1894 | { |
| 1895 | FileFdErrno("lseek","Unable to seek in gzipped file"); |
| 1896 | return 0; |
| 1897 | } |
| 1898 | |
| 1899 | return size; |
| 1900 | } |
| 1901 | #endif |
| 1902 | |
| 1903 | return size; |
| 1904 | } |
| 1905 | /*}}}*/ |
| 1906 | // FileFd::Close - Close the file if the close flag is set /*{{{*/ |
| 1907 | // --------------------------------------------------------------------- |
| 1908 | /* */ |
| 1909 | bool FileFd::Close() |
| 1910 | { |
| 1911 | if (iFd == -1) |
| 1912 | return true; |
| 1913 | |
| 1914 | bool Res = true; |
| 1915 | if ((Flags & AutoClose) == AutoClose) |
| 1916 | { |
| 1917 | if ((Flags & Compressed) != Compressed && iFd > 0 && close(iFd) != 0) |
| 1918 | Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str()); |
| 1919 | |
| 1920 | if (d != NULL) |
| 1921 | { |
| 1922 | Res &= d->CloseDown(FileName); |
| 1923 | delete d; |
| 1924 | d = NULL; |
| 1925 | } |
| 1926 | } |
| 1927 | |
| 1928 | if ((Flags & Replace) == Replace) { |
| 1929 | if (rename(TemporaryFileName.c_str(), FileName.c_str()) != 0) |
| 1930 | Res &= _error->Errno("rename",_("Problem renaming the file %s to %s"), TemporaryFileName.c_str(), FileName.c_str()); |
| 1931 | |
| 1932 | FileName = TemporaryFileName; // for the unlink() below. |
| 1933 | TemporaryFileName.clear(); |
| 1934 | } |
| 1935 | |
| 1936 | iFd = -1; |
| 1937 | |
| 1938 | if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail && |
| 1939 | FileName.empty() == false) |
| 1940 | if (unlink(FileName.c_str()) != 0) |
| 1941 | Res &= _error->WarningE("unlnk",_("Problem unlinking the file %s"), FileName.c_str()); |
| 1942 | |
| 1943 | if (Res == false) |
| 1944 | Flags |= Fail; |
| 1945 | return Res; |
| 1946 | } |
| 1947 | /*}}}*/ |
| 1948 | // FileFd::Sync - Sync the file /*{{{*/ |
| 1949 | // --------------------------------------------------------------------- |
| 1950 | /* */ |
| 1951 | bool FileFd::Sync() |
| 1952 | { |
| 1953 | if (fsync(iFd) != 0) |
| 1954 | return FileFdErrno("sync",_("Problem syncing the file")); |
| 1955 | return true; |
| 1956 | } |
| 1957 | /*}}}*/ |
| 1958 | // FileFd::FileFdErrno - set Fail and call _error->Errno *{{{*/ |
| 1959 | bool FileFd::FileFdErrno(const char *Function, const char *Description,...) |
| 1960 | { |
| 1961 | Flags |= Fail; |
| 1962 | va_list args; |
| 1963 | size_t msgSize = 400; |
| 1964 | int const errsv = errno; |
| 1965 | while (true) |
| 1966 | { |
| 1967 | va_start(args,Description); |
| 1968 | if (_error->InsertErrno(GlobalError::ERROR, Function, Description, args, errsv, msgSize) == false) |
| 1969 | break; |
| 1970 | va_end(args); |
| 1971 | } |
| 1972 | return false; |
| 1973 | } |
| 1974 | /*}}}*/ |
| 1975 | // FileFd::FileFdError - set Fail and call _error->Error *{{{*/ |
| 1976 | bool FileFd::FileFdError(const char *Description,...) { |
| 1977 | Flags |= Fail; |
| 1978 | va_list args; |
| 1979 | size_t msgSize = 400; |
| 1980 | while (true) |
| 1981 | { |
| 1982 | va_start(args,Description); |
| 1983 | if (_error->Insert(GlobalError::ERROR, Description, args, msgSize) == false) |
| 1984 | break; |
| 1985 | va_end(args); |
| 1986 | } |
| 1987 | return false; |
| 1988 | } |
| 1989 | /*}}}*/ |
| 1990 | |
| 1991 | APT_DEPRECATED gzFile FileFd::gzFd() { |
| 1992 | #ifdef HAVE_ZLIB |
| 1993 | return d->gz; |
| 1994 | #else |
| 1995 | return NULL; |
| 1996 | #endif |
| 1997 | } |
| 1998 | |
| 1999 | |
| 2000 | // Glob - wrapper around "glob()" /*{{{*/ |
| 2001 | // --------------------------------------------------------------------- |
| 2002 | /* */ |
| 2003 | std::vector<std::string> Glob(std::string const &pattern, int flags) |
| 2004 | { |
| 2005 | std::vector<std::string> result; |
| 2006 | glob_t globbuf; |
| 2007 | int glob_res; |
| 2008 | unsigned int i; |
| 2009 | |
| 2010 | glob_res = glob(pattern.c_str(), flags, NULL, &globbuf); |
| 2011 | |
| 2012 | if (glob_res != 0) |
| 2013 | { |
| 2014 | if(glob_res != GLOB_NOMATCH) { |
| 2015 | _error->Errno("glob", "Problem with glob"); |
| 2016 | return result; |
| 2017 | } |
| 2018 | } |
| 2019 | |
| 2020 | // append results |
| 2021 | for(i=0;i<globbuf.gl_pathc;i++) |
| 2022 | result.push_back(string(globbuf.gl_pathv[i])); |
| 2023 | |
| 2024 | globfree(&globbuf); |
| 2025 | return result; |
| 2026 | } |
| 2027 | /*}}}*/ |
| 2028 | |
| 2029 | std::string GetTempDir() |
| 2030 | { |
| 2031 | const char *tmpdir = getenv("TMPDIR"); |
| 2032 | |
| 2033 | #ifdef P_tmpdir |
| 2034 | if (!tmpdir) |
| 2035 | tmpdir = P_tmpdir; |
| 2036 | #endif |
| 2037 | |
| 2038 | // check that tmpdir is set and exists |
| 2039 | struct stat st; |
| 2040 | if (!tmpdir || strlen(tmpdir) == 0 || stat(tmpdir, &st) != 0) |
| 2041 | tmpdir = "/tmp"; |
| 2042 | |
| 2043 | return string(tmpdir); |
| 2044 | } |
| 2045 | |
| 2046 | bool Rename(std::string From, std::string To) |
| 2047 | { |
| 2048 | if (rename(From.c_str(),To.c_str()) != 0) |
| 2049 | { |
| 2050 | _error->Error(_("rename failed, %s (%s -> %s)."),strerror(errno), |
| 2051 | From.c_str(),To.c_str()); |
| 2052 | return false; |
| 2053 | } |
| 2054 | return true; |
| 2055 | } |