1 /* getfattr.c - Read POSIX extended attributes.
2 *
3 * Copyright 2016 Android Open Source Project.
4 *
5 * No standard
6
7 USE_GETFATTR(NEWTOY(getfattr, "dhn:", TOYFLAG_USR|TOYFLAG_BIN))
8
9 config 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
GLOBALS(char * n;)25 GLOBALS(
26 char *n;
27 )
28
29 // TODO: factor out the lister and getter loops and use them in cp too.
30 static 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
getfattr_main(void)90 void getfattr_main(void)
91 {
92 char **s;
93
94 for (s=toys.optargs; *s; s++) do_getfattr(*s);
95 }
96