LXR busybox/miscutils/setfattr.c

   1/*
   2 * setfattr - set extended attributes of filesystem objects.
   3 *
   4 * Copyright (C) 2017 by Denys Vlasenko <vda.linux@googlemail.com>
   5 *
   6 * Licensed under GPLv2, see file LICENSE in this source tree.
   7 */
   8//config:config SETFATTR
   9//config:       bool "setfattr (3.6 kb)"
  10//config:       default y
  11//config:       help
  12//config:       Set/delete extended attributes on files
  13
  14//applet:IF_SETFATTR(APPLET_NOEXEC(setfattr, setfattr, BB_DIR_USR_BIN, BB_SUID_DROP, setfattr))
  15
  16//kbuild:lib-$(CONFIG_SETFATTR) += setfattr.o
  17
  18#include <sys/xattr.h>
  19#include "libbb.h"
  20
  21//usage:#define setfattr_trivial_usage
  22//usage:       "[-h] -n|-x ATTR [-v VALUE] FILE..."
  23//usage:#define setfattr_full_usage "\n\n"
  24//usage:       "Set extended attributes"
  25//usage:     "\n"
  26//usage:     "\n        -h              Do not follow symlinks"
  27//usage:     "\n        -x ATTR         Remove attribute ATTR"
  28//usage:     "\n        -n ATTR         Set attribute ATTR to VALUE"
  29//usage:     "\n        -v VALUE        (default: empty)"
  30int setfattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  31int setfattr_main(int argc UNUSED_PARAM, char **argv)
  32{
  33        const char *name;
  34        const char *value = "";
  35        int status;
  36        int opt;
  37        enum {
  38                OPT_h = (1 << 0),
  39                OPT_x = (1 << 1),
  40        };
  41
  42        opt = getopt32(argv, "^"
  43                "hx:n:v:"
  44                /* Min one arg, either -x or -n is a must, -x does not allow -v */
  45                "\0" "-1:x:n:n--x:x--nv:v--x"
  46                , &name, &name, &value
  47        );
  48        argv += optind;
  49
  50        status = EXIT_SUCCESS;
  51        do {
  52                int r;
  53                if (opt & OPT_x)
  54                        r = ((opt & OPT_h) ? lremovexattr : removexattr)(*argv, name);
  55                else {
  56                        r = ((opt & OPT_h) ? lsetxattr : setxattr)(
  57                                        *argv, name,
  58                                        value, strlen(value), /*flags:*/ 0
  59                        );
  60                }
  61                if (r) {
  62                        bb_simple_perror_msg(*argv);
  63                        status = EXIT_FAILURE;
  64                }
  65        } while (*++argv);
  66
  67        return status;
  68}
  69