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getfattr: new applet

Browse Source 
function                                             old     new   delta
getfattr_main                                          -     309    +309
print_attr                                             -     115    +115
packed_usage                                       34576   34631     +55
.rodata                                           105349  105395     +46
lgetxattr                                              -      41     +41
getxattr                                               -      41     +41
llistxattr                                             -      35     +35
listxattr                                              -      35     +35
applet_names                                        2806    2815      +9
applet_main                                         1620    1624      +4
------------------------------------------------------------------------------
(add/remove: 7/0 grow/shrink: 4/0 up/down: 690/0)             Total: 690 bytes

Signed-off-by: YU Jincheng <shana@zju.edu.cn>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
YU Jincheng 2023-07-07 16:44:24 +08:00 committed by Denys Vlasenko
parent ab755f4925
commit cf809e2f2d
1 changed files with 131 additions and 0 deletions
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131
miscutils/getfattr.c Normal file
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@ -0,0 +1,131 @@
/*
* getfattr - get extended attributes of filesystem objects.
*
* Copyright (C) 2023 by LoveSy <lovesykun@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this source tree.
*/
//config:config GETFATTR
//config: bool "getfattr (12.3 kb)"
//config: default y
//config: help
//config: Get extended attributes on files
//applet:IF_GETFATTR(APPLET_NOEXEC(getfattr, getfattr, BB_DIR_USR_BIN, BB_SUID_DROP, getfattr))
//kbuild:lib-$(CONFIG_GETFATTR) += getfattr.o
#include <stdio.h>
#include <sys/xattr.h>
#include "libbb.h"
//usage:#define getfattr_trivial_usage
//usage: "[-h] {-d|-n ATTR} FILE...\n"
//usage:#define getfattr_full_usage "\n\n"
//usage: "Get extended attributes"
//usage: "\n"
//usage: "\n -h Do not follow symlinks"
//usage: "\n -d Dump all attributes"
//usage: "\n -n ATTR Get attribute ATTR"
enum {
OPT_h = (1 << 0),
OPT_d = (1 << 1),
};
static int print_attr(const char *file, const char *name, char **buf, size_t *bufsize)
{
ssize_t len;
if (*bufsize == 0)
goto grow;
again:
len = ((option_mask32 & OPT_h) ? lgetxattr: getxattr)(file, name, *buf, *bufsize);
if (len < 0) {
if (errno != ERANGE)
return len;
grow:
*bufsize = (*bufsize * 2) + 1024;
*buf = xrealloc(*buf, *bufsize);
goto again;
}
printf("%s=\"%.*s\"\n", name, len, *buf);
return 0;
}
static ssize_t list_attr(const char *file, char **list, size_t *listsize)
{
ssize_t len;
if (*listsize == 0)
goto grow;
again:
len = ((option_mask32 & OPT_h) ? llistxattr : listxattr)(file, *list, *listsize);
if (len < 0) {
if (errno != ERANGE)
return len;
grow:
*listsize = (*listsize * 2) + 1024;
*list = xrealloc(*list, *listsize);
goto again;
}
return len;
}
int getfattr_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int getfattr_main(int argc UNUSED_PARAM, char **argv)
{
const char *name;
int status;
int opt;
char *buf = NULL;
size_t bufsize = 0;
char *list = NULL;
size_t listsize = 0;
opt = getopt32(argv, "^"
"hdn:"
/* Min one arg; exactly one of -n or -d is required. */
"\0" "-1:d:n:n--d:d--n"
, &name
);
argv += optind;
status = EXIT_SUCCESS;
do {
int r;
if (opt & OPT_d) {
ssize_t len = list_attr(*argv, &list, &listsize);
if (len > 0) {
char *key;
printf("# file: %s\n", *argv);
key = list;
while (len > 0) {
ssize_t keylen;
r = print_attr(*argv, key, &buf, &bufsize);
if (r)
goto err;
keylen = strlen(key) + 1;
key += keylen;
len -= keylen;
}
bb_putchar('\n');
}
} else {
printf("# file: %s\n", *argv);
r = print_attr(*argv, name, &buf, &bufsize);
if (r) {
err:
bb_simple_perror_msg(*argv);
status = EXIT_FAILURE;
// continue; maybe?
}
bb_putchar('\n');
}
} while (*++argv);
if (ENABLE_FEATURE_CLEAN_UP)
free(buf);
fflush_stdout_and_exit(status);
}