cf809e2f2
YU Jincheng
2023-07-16
Subject
getfattr: new applet
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Commit Diff GitHub →
miscutils/getfattr.c+131 -0
| @@ -0,0 +1,131 @@ | |
| + | /* |
| + | * getfattr - get extended attributes of filesystem objects. |
| + | * |
| + | * Copyright (C) 2023 by LoveSy <[email protected]> |
| + | * |
| + | * 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); |
| + | } |