mirror of
https://github.com/libguestfs/libguestfs.git
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141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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#include "ignore-value.h"
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GUESTFSD_EXT_CMD(str_mount, mount);
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GUESTFSD_EXT_CMD(str_umount, umount);
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static inline void
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umount_ignore_fail (const char *path)
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{
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ignore_value (command (NULL, NULL, str_umount, path, NULL));
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}
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char *
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do_command (char *const *argv)
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{
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char *out;
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CLEANUP_FREE char *err = NULL;
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int r;
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CLEANUP_FREE char *sysroot_dev = NULL, *sysroot_dev_pts = NULL,
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*sysroot_proc = NULL, *sysroot_sys = NULL;
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int dev_ok, dev_pts_ok, proc_ok, sys_ok;
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/* We need a root filesystem mounted to do this. */
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NEED_ROOT (, return NULL);
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/* Conveniently, argv is already a NULL-terminated argv-style array
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* of parameters, so we can pass it straight in to our internal
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* commandv. We just have to check the list is non-empty.
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*/
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if (argv[0] == NULL) {
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reply_with_error ("passed an empty list");
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return NULL;
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}
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/* While running the command, bind-mount /dev, /proc, /sys
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* into the chroot. However we must be careful to unmount them
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* afterwards because otherwise they would interfere with
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* future mount and unmount operations.
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*
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* We deliberately allow these commands to fail silently, BUT
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* if a mount fails, don't unmount the corresponding mount.
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*/
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sysroot_dev = sysroot_path ("/dev");
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sysroot_dev_pts = sysroot_path ("/dev/pts");
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sysroot_proc = sysroot_path ("/proc");
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sysroot_sys = sysroot_path ("/sys");
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if (sysroot_dev == NULL || sysroot_dev_pts == NULL ||
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sysroot_proc == NULL || sysroot_sys == NULL) {
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reply_with_perror ("malloc");
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return NULL;
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}
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r = command (NULL, NULL, str_mount, "--bind", "/dev", sysroot_dev, NULL);
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dev_ok = r != -1;
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r = command (NULL, NULL, str_mount, "--bind", "/dev/pts", sysroot_dev_pts, NULL);
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dev_pts_ok = r != -1;
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r = command (NULL, NULL, str_mount, "--bind", "/proc", sysroot_proc, NULL);
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proc_ok = r != -1;
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r = command (NULL, NULL, str_mount, "--bind", "/sys", sysroot_sys, NULL);
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sys_ok = r != -1;
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CHROOT_IN;
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r = commandv (&out, &err, (const char * const *) argv);
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CHROOT_OUT;
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if (sys_ok) umount_ignore_fail (sysroot_sys);
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if (proc_ok) umount_ignore_fail (sysroot_proc);
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if (dev_pts_ok) umount_ignore_fail (sysroot_dev_pts);
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if (dev_ok) umount_ignore_fail (sysroot_dev);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (out);
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return NULL;
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}
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return out; /* Caller frees. */
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}
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char **
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do_command_lines (char *const *argv)
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{
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CLEANUP_FREE char *out = NULL;
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char **lines;
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out = do_command (argv);
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if (out == NULL)
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return NULL;
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lines = split_lines (out);
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if (lines == NULL)
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return NULL;
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return lines; /* Caller frees. */
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}
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char *
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do_sh (const char *cmd)
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{
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const char *argv[] = { "/bin/sh", "-c", cmd, NULL };
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return do_command ((char **) argv);
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}
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char **
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do_sh_lines (const char *cmd)
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{
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const char *argv[] = { "/bin/sh", "-c", cmd, NULL };
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return do_command_lines ((char **) argv);
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}
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