LXR toybox/toys/pending/getfattr.c

   1/* getfattr.c - Read POSIX extended attributes.
   2 *
   3 * Copyright 2016 Android Open Source Project.
   4 *
   5 * No standard
   6
   7USE_GETFATTR(NEWTOY(getfattr, "dhn:", TOYFLAG_USR|TOYFLAG_BIN))
   8
   9config GETFATTR
  10  bool "getfattr"
  11  default n
  12  help
  13    usage: getfattr [-d] [-h] [-n NAME] FILE...
  14
  15    Read POSIX extended attributes.
  16
  17    -d  Show values as well as names
  18    -h  Do not dereference symbolic links
  19    -n  Show only attributes with the given name
  20*/
  21
  22#define FOR_getfattr
  23#include "toys.h"
  24
  25GLOBALS(
  26  char *n;
  27)
  28
  29// TODO: factor out the lister and getter loops and use them in cp too.
  30static void do_getfattr(char *file)
  31{
  32  ssize_t (*getter)(const char *, const char *, void *, size_t) = getxattr;
  33  ssize_t (*lister)(const char *, char *, size_t) = listxattr;
  34  char **sorted_keys;
  35  ssize_t keys_len;
  36  char *keys, *key;
  37  int i, key_count;
  38
  39  if (toys.optflags&FLAG_h) {
  40    getter = lgetxattr;
  41    lister = llistxattr;
  42  }
  43
  44  // Collect the keys.
  45  while ((keys_len = lister(file, NULL, 0))) {
  46    if (keys_len == -1) perror_msg("listxattr failed");
  47    keys = xmalloc(keys_len);
  48    if (lister(file, keys, keys_len) == keys_len) break;
  49    free(keys);
  50  }
  51
  52  if (keys_len == 0) return;
  53
  54  // Sort the keys.
  55  for (key = keys, key_count = 0; key-keys < keys_len; key += strlen(key)+1)
  56    key_count++;
  57  sorted_keys = xmalloc(key_count * sizeof(char *));
  58  for (key = keys, i = 0; key-keys < keys_len; key += strlen(key)+1)
  59    sorted_keys[i++] = key;
  60  qsort(sorted_keys, key_count, sizeof(char *), qstrcmp);
  61
  62  printf("# file: %s\n", file);
  63
  64  for (i = 0; i < key_count; i++) {
  65    key = sorted_keys[i];
  66
  67    if (TT.n && strcmp(TT.n, key)) continue;
  68
  69    if (toys.optflags&FLAG_d) {
  70      ssize_t value_len;
  71      char *value = NULL;
  72
  73      while ((value_len = getter(file, key, NULL, 0))) {
  74        if (value_len == -1) perror_msg("getxattr failed");
  75        value = xzalloc(value_len+1);
  76        if (getter(file, key, value, value_len) == value_len) break;
  77        free(value);
  78      }
  79
  80      if (!value) puts(key);
  81      else printf("%s=\"%s\"\n", key, value);
  82      free(value);
  83    } else puts(key); // Just list names.
  84  }
  85
  86  xputc('\n');
  87  free(sorted_keys);
  88}
  89
  90void getfattr_main(void)
  91{
  92  char **s;
  93
  94  for (s=toys.optargs; *s; s++) do_getfattr(*s);
  95}
  96