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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 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.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include "daemon.h"
#include "actions.h"
GUESTFSD_EXT_CMD(str_ln, ln);
char *
do_readlink (const char *path)
{
ssize_t r;
char *ret;
char link[PATH_MAX];
CHROOT_IN;
r = readlink (path, link, sizeof link);
CHROOT_OUT;
if (r == -1) {
reply_with_perror ("readlink");
return NULL;
}
ret = strndup (link, r);
if (ret == NULL) {
reply_with_perror ("strndup");
return NULL;
}
return ret; /* caller frees */
}
char **
do_internal_readlinklist (const char *path, char *const *names)
{
int fd_cwd;
size_t i;
ssize_t r;
char link[PATH_MAX];
const char *str;
DECLARE_STRINGSBUF (ret);
CHROOT_IN;
fd_cwd = open (path, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
CHROOT_OUT;
if (fd_cwd == -1) {
reply_with_perror ("open: %s", path);
return NULL;
}
for (i = 0; names[i] != NULL; ++i) {
r = readlinkat (fd_cwd, names[i], link, sizeof link);
if (r >= PATH_MAX) {
reply_with_perror ("readlinkat: returned link is too long");
close (fd_cwd);
return NULL;
}
/* Because of the way this function is intended to be used,
* we actually expect to see errors here, and they are not fatal.
*/
if (r >= 0) {
link[r] = '\0';
str = link;
} else
str = "";
if (add_string (&ret, str) == -1) {
close (fd_cwd);
return NULL;
}
}
close (fd_cwd);
if (end_stringsbuf (&ret) == -1)
return NULL;
return ret.argv;
}
static int
_link (const char *flag, int symbolic, const char *target, const char *linkname)
{
int r;
char *err;
char *buf_linkname;
char *buf_target;
/* Prefix linkname with sysroot. */
buf_linkname = sysroot_path (linkname);
if (!buf_linkname) {
reply_with_perror ("malloc");
return -1;
}
/* Only prefix target if it's _not_ a symbolic link, and if
* the target is absolute. Note that the resulting link will
* always be "broken" from the p.o.v. of the appliance, ie:
* /a -> /b but the path as seen here is /sysroot/b
*/
buf_target = NULL;
if (!symbolic && target[0] == '/') {
buf_target = sysroot_path (target);
if (!buf_target) {
reply_with_perror ("malloc");
free (buf_linkname);
return -1;
}
}
if (flag)
r = command (NULL, &err,
str_ln, flag, "--", /* target could begin with '-' */
buf_target ? : target, buf_linkname, NULL);
else
r = command (NULL, &err,
str_ln, "--",
buf_target ? : target, buf_linkname, NULL);
free (buf_linkname);
free (buf_target);
if (r == -1) {
reply_with_error ("ln%s%s: %s: %s: %s",
flag ? " " : "",
flag ? : "",
target, linkname, err);
free (err);
return -1;
}
free (err);
return 0;
}
int
do_ln (const char *target, const char *linkname)
{
return _link (NULL, 0, target, linkname);
}
int
do_ln_f (const char *target, const char *linkname)
{
return _link ("-f", 0, target, linkname);
}
int
do_ln_s (const char *target, const char *linkname)
{
return _link ("-s", 1, target, linkname);
}
int
do_ln_sf (const char *target, const char *linkname)
{
return _link ("-sf", 1, target, linkname);
}
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