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/* virt-ls visitor function
* Copyright (C) 2010-2019 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* This file contains a recursive function for visiting all files and
* directories in a guestfs filesystem.
*
* Adapted from
* L<https://rwmj.wordpress.com/2010/12/15/tip-audit-virtual-machine-for-setuid-files/>
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <libintl.h>
#include "getprogname.h"
#include "guestfs.h"
#include "guestfs-utils.h"
#include "structs-cleanups.h"
#include "visit.h"
static int _visit (guestfs_h *g, int depth, const char *dir, visitor_function f, void *opaque);
/**
* Visit every file and directory in a guestfs filesystem, starting
* at C<dir>.
*
* C<dir> may be C<"/"> to visit the entire filesystem, or may be some
* subdirectory. Symbolic links are not followed.
*
* The visitor function C<f> is called once for every directory and
* every file. The parameters passed to C<f> include the current
* directory name, the current file name (or C<NULL> when we're
* visiting a directory), the C<guestfs_statns> (file permissions
* etc), and the list of extended attributes of the file. The visitor
* function may return C<-1> which causes the whole recursion to stop
* with an error.
*
* Also passed to this function is an C<opaque> pointer which is
* passed through to the visitor function.
*
* Returns C<0> if everything went OK, or C<-1> if there was an error.
* Error handling is not particularly well defined. It will either
* set an error in the libguestfs handle or print an error on stderr,
* but there is no way for the caller to tell the difference.
*/
int
visit (guestfs_h *g, const char *dir, visitor_function f, void *opaque)
{
return _visit (g, 0, dir, f, opaque);
}
static int
_visit (guestfs_h *g, int depth, const char *dir,
visitor_function f, void *opaque)
{
/* Call 'f' with the top directory. Note that ordinary recursive
* visits will not otherwise do this, so we have to have a special
* case.
*/
if (depth == 0) {
CLEANUP_FREE_STATNS struct guestfs_statns *stat = NULL;
CLEANUP_FREE_XATTR_LIST struct guestfs_xattr_list *xattrs = NULL;
int r;
stat = guestfs_lstatns (g, dir);
if (stat == NULL)
return -1;
xattrs = guestfs_lgetxattrs (g, dir);
if (xattrs == NULL)
return -1;
r = f (dir, NULL, stat, xattrs, opaque);
if (r == -1)
return -1;
}
size_t i, xattrp;
CLEANUP_FREE_STRING_LIST char **names = NULL;
CLEANUP_FREE_STAT_LIST struct guestfs_statns_list *stats = NULL;
CLEANUP_FREE_XATTR_LIST struct guestfs_xattr_list *xattrs = NULL;
names = guestfs_ls (g, dir);
if (names == NULL)
return -1;
stats = guestfs_lstatnslist (g, dir, names);
if (stats == NULL)
return -1;
xattrs = guestfs_lxattrlist (g, dir, names);
if (xattrs == NULL)
return -1;
/* Call function on everything in this directory. */
for (i = 0, xattrp = 0; names[i] != NULL; ++i, ++xattrp) {
CLEANUP_FREE char *path = NULL;
CLEANUP_FREE char *attrval = NULL;
struct guestfs_xattr_list file_xattrs;
size_t nr_xattrs;
assert (stats->len >= i);
assert (xattrs->len >= xattrp);
/* Find the list of extended attributes for this file. */
assert (strlen (xattrs->val[xattrp].attrname) == 0);
if (xattrs->val[xattrp].attrval_len == 0) {
fprintf (stderr, _("%s: error getting extended attrs for %s %s\n"),
getprogname (), dir, names[i]);
return -1;
}
/* attrval is not \0-terminated. */
attrval = malloc (xattrs->val[xattrp].attrval_len + 1);
if (attrval == NULL) {
perror ("malloc");
return -1;
}
memcpy (attrval, xattrs->val[xattrp].attrval,
xattrs->val[xattrp].attrval_len);
attrval[xattrs->val[xattrp].attrval_len] = '\0';
if (sscanf (attrval, "%zu", &nr_xattrs) != 1) {
fprintf (stderr, _("%s: error: cannot parse xattr count for %s %s\n"),
getprogname (), dir, names[i]);
return -1;
}
file_xattrs.len = nr_xattrs;
file_xattrs.val = &xattrs->val[xattrp+1];
xattrp += nr_xattrs;
/* Call the function. */
if (f (dir, names[i], &stats->val[i], &file_xattrs, opaque) == -1)
return -1;
/* Recursively call visit, but only on directories. */
if (guestfs_int_is_dir (stats->val[i].st_mode)) {
path = guestfs_int_full_path (dir, names[i]);
if (!path) {
perror ("guestfs_int_full_path");
return -1;
}
if (_visit (g, depth + 1, path, f, opaque) == -1)
return -1;
}
}
return 0;
}
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