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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 "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "ignore-value.h"
static inline void
umount_ignore_fail (const char *path)
{
ignore_value (command (NULL, NULL, "umount", path, NULL));
}
char *
do_command (char *const *argv)
{
char *out, *err;
int r;
char *sysroot_dev, *sysroot_dev_pts, *sysroot_proc,
*sysroot_selinux, *sysroot_sys;
int dev_ok, dev_pts_ok, proc_ok, selinux_ok, sys_ok;
/* We need a root filesystem mounted to do this. */
NEED_ROOT (, return NULL);
/* Conveniently, argv is already a NULL-terminated argv-style array
* of parameters, so we can pass it straight in to our internal
* commandv. We just have to check the list is non-empty.
*/
if (argv[0] == NULL) {
reply_with_error ("passed an empty list");
return NULL;
}
/* While running the command, bind-mount /dev, /proc, /sys
* into the chroot. However we must be careful to unmount them
* afterwards because otherwise they would interfere with
* future mount and unmount operations.
*
* We deliberately allow these commands to fail silently, BUT
* if a mount fails, don't unmount the corresponding mount.
*/
sysroot_dev = sysroot_path ("/dev");
sysroot_dev_pts = sysroot_path ("/dev/pts");
sysroot_proc = sysroot_path ("/proc");
sysroot_selinux = sysroot_path ("/selinux");
sysroot_sys = sysroot_path ("/sys");
if (sysroot_dev == NULL || sysroot_dev_pts == NULL ||
sysroot_proc == NULL || sysroot_selinux == NULL ||
sysroot_sys == NULL) {
reply_with_perror ("malloc");
free (sysroot_dev);
free (sysroot_dev_pts);
free (sysroot_proc);
free (sysroot_selinux);
free (sysroot_sys);
return NULL;
}
r = command (NULL, NULL, "mount", "--bind", "/dev", sysroot_dev, NULL);
dev_ok = r != -1;
r = command (NULL, NULL, "mount", "--bind", "/dev/pts", sysroot_dev_pts, NULL);
dev_pts_ok = r != -1;
r = command (NULL, NULL, "mount", "--bind", "/proc", sysroot_proc, NULL);
proc_ok = r != -1;
r = command (NULL, NULL, "mount", "--bind", "/selinux", sysroot_selinux, NULL);
selinux_ok = r != -1;
r = command (NULL, NULL, "mount", "--bind", "/sys", sysroot_sys, NULL);
sys_ok = r != -1;
CHROOT_IN;
r = commandv (&out, &err, (const char * const *) argv);
CHROOT_OUT;
if (sys_ok) umount_ignore_fail (sysroot_sys);
if (selinux_ok) umount_ignore_fail (sysroot_selinux);
if (proc_ok) umount_ignore_fail (sysroot_proc);
if (dev_pts_ok) umount_ignore_fail (sysroot_dev_pts);
if (dev_ok) umount_ignore_fail (sysroot_dev);
free (sysroot_dev);
free (sysroot_dev_pts);
free (sysroot_proc);
free (sysroot_selinux);
free (sysroot_sys);
if (r == -1) {
reply_with_error ("%s", err);
free (out);
free (err);
return NULL;
}
free (err);
return out; /* Caller frees. */
}
char **
do_command_lines (char *const *argv)
{
char *out;
char **lines;
out = do_command (argv);
if (out == NULL)
return NULL;
lines = split_lines (out);
free (out);
if (lines == NULL)
return NULL;
return lines; /* Caller frees. */
}
char *
do_sh (const char *cmd)
{
const char *argv[] = { "/bin/sh", "-c", cmd, NULL };
return do_command ((char **) argv);
}
char **
do_sh_lines (const char *cmd)
{
const char *argv[] = { "/bin/sh", "-c", cmd, NULL };
return do_command_lines ((char **) argv);
}
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