/* * chattr.c - Change file attributes on an ext2 file system * * Copyright (C) 1993, 1994 Remy Card <card@masi.ibp.fr> * Laboratoire MASI, Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * This file can be redistributed under the terms of the GNU General * Public License */ /* * History: * 93/10/30 - Creation * 93/11/13 - Replace stat() calls by lstat() to avoid loops * 94/02/27 - Integrated in Ted's distribution * 98/12/29 - Ignore symlinks when working recursively (G M Sipe) * 98/12/29 - Display version info only when -V specified (G M Sipe) */ #include <sys/types.h> #include <dirent.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <sys/param.h> #include <sys/stat.h> #include <ext2fs/ext2_fs.h> #ifdef __GNUC__ # define EXT2FS_ATTR(x) __attribute__(x) #else # define EXT2FS_ATTR(x) #endif #include "e2fsbb.h" #include "e2p/e2p.h" #define OPT_ADD 1 #define OPT_REM 2 #define OPT_SET 4 #define OPT_SET_VER 8 static int flags; static int recursive; static unsigned long version; static unsigned long af; static unsigned long rf; static unsigned long sf; #ifdef CONFIG_LFS # define LSTAT lstat64 # define STRUCT_STAT struct stat64 #else # define LSTAT lstat # define STRUCT_STAT struct stat #endif struct flags_char { unsigned long flag; char optchar; }; static const struct flags_char flags_array[] = { { EXT2_NOATIME_FL, 'A' }, { EXT2_SYNC_FL, 'S' }, { EXT2_DIRSYNC_FL, 'D' }, { EXT2_APPEND_FL, 'a' }, { EXT2_COMPR_FL, 'c' }, { EXT2_NODUMP_FL, 'd' }, { EXT2_IMMUTABLE_FL, 'i' }, { EXT3_JOURNAL_DATA_FL, 'j' }, { EXT2_SECRM_FL, 's' }, { EXT2_UNRM_FL, 'u' }, { EXT2_NOTAIL_FL, 't' }, { EXT2_TOPDIR_FL, 'T' }, { 0, 0 } }; static unsigned long get_flag(char c) { const struct flags_char *fp; for (fp = flags_array; fp->flag; fp++) if (fp->optchar == c) return fp->flag; bb_show_usage(); return 0; } static int decode_arg(char *arg) { unsigned long *fl; char opt = *arg++; if (opt == '-') { flags |= OPT_REM; fl = &rf; } else if (opt == '+') { flags |= OPT_ADD; fl = ⁡ } else if (opt == '=') { flags |= OPT_SET; fl = &sf; } else return EOF; for (; *arg ; ++arg) (*fl) |= get_flag(*arg); return 1; } static int chattr_dir_proc(const char *, struct dirent *, void *); static void change_attributes(const char * name) { unsigned long fsflags; STRUCT_STAT st; if (LSTAT(name, &st) == -1) { bb_error_msg("stat %s failed", name); return; } if (S_ISLNK(st.st_mode) && recursive) return; /* Don't try to open device files, fifos etc. We probably * ought to display an error if the file was explicitly given * on the command line (whether or not recursive was * requested). */ if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode)) return; if (flags & OPT_SET_VER) if (fsetversion(name, version) == -1) bb_error_msg("setting version on %s", name); if (flags & OPT_SET) { fsflags = sf; } else { if (fgetflags(name, &fsflags) == -1) { bb_error_msg("reading flags on %s", name); goto skip_setflags; } if (flags & OPT_REM) fsflags &= ~rf; if (flags & OPT_ADD) fsflags |= af; if (!S_ISDIR(st.st_mode)) fsflags &= ~EXT2_DIRSYNC_FL; } if (fsetflags(name, fsflags) == -1) bb_error_msg("setting flags on %s", name); skip_setflags: if (S_ISDIR(st.st_mode) && recursive) iterate_on_dir(name, chattr_dir_proc, NULL); } static int chattr_dir_proc(const char *dir_name, struct dirent *de, void *private EXT2FS_ATTR((unused))) { /*if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {*/ if (de->d_name[0] == '.' && (de->d_name[1] == '\0' || \ (de->d_name[1] == '.' && de->d_name[2] == '\0'))) { char *path = concat_subpath_file(dir_name, de->d_name); if (path) { change_attributes(path); free(path); } } return 0; } int chattr_main(int argc, char **argv) { int i; char *arg; /* parse the args */ for (i = 1; i < argc; ++i) { arg = argv[i]; /* take care of -R and -v <version> */ if (arg[0] == '-') { if (arg[1] == 'R' && arg[2] == '\0') { recursive = 1; continue; } else if (arg[1] == 'v' && arg[2] == '\0') { char *tmp; ++i; if (i >= argc) bb_show_usage(); version = strtol(argv[i], &tmp, 0); if (*tmp) bb_error_msg_and_die("bad version '%s'", arg); flags |= OPT_SET_VER; continue; } } if (decode_arg(arg) == EOF) break; } /* run sanity checks on all the arguments given us */ if (i >= argc) bb_show_usage(); if ((flags & OPT_SET) && ((flags & OPT_ADD) || (flags & OPT_REM))) bb_error_msg_and_die("= is incompatible with - and +"); if ((rf & af) != 0) bb_error_msg_and_die("Can't set and unset a flag"); if (!flags) bb_error_msg_and_die("Must use '-v', =, - or +"); /* now run chattr on all the files passed to us */ while (i < argc) change_attributes(argv[i++]); return EXIT_SUCCESS; }