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|
/****************************************************************************
| (C) Copyright 2008 Novell, Inc. All Rights Reserved.
|
| GPLv2: This program is free software; you can redistribute it
| and/or modify it under the terms of version 2 of the GNU General
| Public License as published by the Free Software Foundation.
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
+-------------------------------------------------------------------------*/
/*
* NOTE from Dees_Troy: modified source to display values along with xattr names
* Below code comments about usage are no longer accurate but came from the
* original source code from the chromium project and combine features of
* listxattr and getfattr:
* https://chromium.googlesource.com/chromiumos/platform/punybench/+/factory-1235.B/file.m/listxattr.c
* https://chromium.googlesource.com/chromiumos/platform/punybench/+/factory-1235.B/file.m/getxattr.c
*/
/*
* LISTXATTR(2) Linux Programmer's Manual LISTXATTR(2)
*
*
*
* NAME
* listxattr, llistxattr, flistxattr - list extended attribute names
*
* SYNOPSIS
* #include <sys/types.h>
* #include <attr/xattr.h>
*
* ssize_t listxattr (const char *path,
* char *list, size_t size);
* ssize_t llistxattr (const char *path,
* char *list, size_t size);
* ssize_t flistxattr (int filedes,
* char *list, size_t size);
*
* DESCRIPTION
* Extended attributes are name:value pairs associated with inodes
* (files, directories, symlinks, etc). They are extensions to the
* normal attributes which are associated with all inodes in the sys-
* tem (i.e. the stat(2) data). A complete overview of extended
* attributes concepts can be found in attr(5).
*
* listxattr retrieves the list of extended attribute names associated
* with the given path in the filesystem. The list is the set of
* (NULL-terminated) names, one after the other. Names of extended
* attributes to which the calling process does not have access may be
* omitted from the list. The length of the attribute name list is
* returned.
*
* llistxattr is identical to listxattr, except in the case of a sym-
* bolic link, where the list of names of extended attributes associ-
* ated with the link itself is retrieved, not the file that it refers
* to.
*
* flistxattr is identical to listxattr, only the open file pointed to
* by filedes (as returned by open(2)) is interrogated in place of
* path.
*
* A single extended attribute name is a simple NULL-terminated
* string. The name includes a namespace prefix; there may be sev-
* eral, disjoint namespaces associated with an individual inode.
*
* An empty buffer of size zero can be passed into these calls to
* return the current size of the list of extended attribute names,
* which can be used to estimate the size of a buffer which is suffi-
* ciently large to hold the list of names.
*
* EXAMPLES
* The list of names is returned as an unordered array of NULL-termi-
* nated character strings (attribute names are separated by NULL
* characters), like this:
* user.name1\0system.name1\0user.name2\0
*
* Filesystems like ext2, ext3 and XFS which implement POSIX ACLs
* using extended attributes, might return a list like this:
* system.posix_acl_access\0system.posix_acl_default\0
*
* RETURN VALUE
* On success, a positive number is returned indicating the size of
* the extended attribute name list. On failure, -1 is returned and
* errno is set appropriately.
*
* If the size of the list buffer is too small to hold the result,
* errno is set to ERANGE.
*
* If extended attributes are not supported by the filesystem, or are
* disabled, errno is set to ENOTSUP.
*
* The errors documented for the stat(2) system call are also applica-
* ble here.
*
* AUTHORS
* Andreas Gruenbacher, <a.gruenbacher@computer.org> and the SGI XFS
* development team, <linux-xfs@oss.sgi.com>. Please send any bug
* reports or comments to these addresses.
*
* SEE ALSO
* getfattr(1), setfattr(1), getxattr(2), open(2), removexattr(2),
* setxattr(2), stat(2), attr(5)
*
*
*
* Dec 2001 Extended Attributes LISTXATTR(2)
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/xattr.h>
//#include <eprintf.h>
//#include <puny.h>
/* dumpmem: dumps an n byte area of memory to screen */
void dumpmem (const void *mem, unsigned int n)
{
const char *c = mem;
unsigned i;
int all_text = 1;
if (n == 0) {
printf("<empty>");
return;
}
for (i = 0; i < n - 1; i++, c++) {
if (!isprint(*c)) {
all_text = 0;
break;
}
}
c = mem;
if (all_text) {
for (i = 0; i < n - 1; i++, c++) {
putchar(*c);
}
return;
} else {
char hex[(n * 2) + 1];
for(i = 0; i < n; i++, c++)
sprintf(hex + (i * 2), "%02X", *c);
hex[n] = 0;
printf("0x%s", hex);
return;
}
}
void dump_list (char *file, char *list, ssize_t size)
{
int c;
int i;
int first = 1;
int j = 0;
char xattr[1024];
char value[1024];
ssize_t size2;
for (i = 0; i < size; i++) {
c = list[i];
if (c) {
if (first) {
putchar('\t');
first = 0;
j = 0;
}
putchar(c);
xattr[j++] = list[i];
} else {
xattr[j] = '\0';
size2 = getxattr(file, xattr, value, sizeof(value));
if (size2 < 0) {
printf("file=%s xattr=%s returned:", file, xattr);
} else {
putchar('=');
dumpmem(value, size2);
}
putchar('\n');
first = 1;
}
}
}
void usage (void)
{
printf("listxattr <file>");
}
char List[1<<17];
int main (int argc, char *argv[])
{
ssize_t size;
if (argc < 2) {
usage();
exit(2);
}
size = listxattr(argv[1], List, sizeof(List));
if (size == -1) {
perror(argv[1]);
exit(2);
}
printf("xattrs for %s:\n", argv[1]);
dump_list(argv[1], List, size);
return 0;
}
|
