/* libguestfs
* Copyright (C) 2010-2012 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; 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 <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <endian.h>
#include <pcre.h>
#ifdef HAVE_HIVEX
#include <hivex.h>
#endif
#include "c-ctype.h"
#include "ignore-value.h"
#include "xstrtol.h"
#include "hash.h"
#include "hash-pjw.h"
#include "guestfs.h"
#include "guestfs-internal.h"
#include "guestfs-internal-actions.h"
#include "guestfs_protocol.h"
#if defined(HAVE_HIVEX)
/* Compile all the regular expressions once when the shared library is
* loaded. PCRE is thread safe so we're supposedly OK here if
* multiple threads call into the libguestfs API functions below
* simultaneously.
*/
static pcre *re_fedora;
static pcre *re_rhel_old;
static pcre *re_rhel;
static pcre *re_rhel_no_minor;
static pcre *re_centos_old;
static pcre *re_centos;
static pcre *re_centos_no_minor;
static pcre *re_scientific_linux_old;
static pcre *re_scientific_linux;
static pcre *re_scientific_linux_no_minor;
static pcre *re_major_minor;
static pcre *re_xdev;
static pcre *re_cciss;
static pcre *re_mdN;
static pcre *re_freebsd;
static pcre *re_netbsd;
static void compile_regexps (void) __attribute__((constructor));
static void free_regexps (void) __attribute__((destructor));
static void
compile_regexps (void)
{
const char *err;
int offset;
#define COMPILE(re,pattern,options) \
do { \
re = pcre_compile ((pattern), (options), &err, &offset, NULL); \
if (re == NULL) { \
ignore_value (write (2, err, strlen (err))); \
abort (); \
} \
} while (0)
COMPILE (re_fedora, "Fedora release (\\d+)", 0);
COMPILE (re_rhel_old,
"Red Hat.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_rhel,
"Red Hat.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_rhel_no_minor,
"Red Hat.*release (\\d+)", 0);
COMPILE (re_centos_old,
"CentOS.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_centos,
"CentOS.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_centos_no_minor,
"CentOS.*release (\\d+)", 0);
COMPILE (re_scientific_linux_old,
"Scientific Linux.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_scientific_linux,
"Scientific Linux.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_scientific_linux_no_minor,
"Scientific Linux.*release (\\d+)", 0);
COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0);
COMPILE (re_xdev, "^/dev/(h|s|v|xv)d([a-z]+)(\\d*)$", 0);
COMPILE (re_cciss, "^/dev/(cciss/c\\d+d\\d+)(?:p(\\d+))?$", 0);
COMPILE (re_mdN, "^(/dev/md\\d+)$", 0);
COMPILE (re_freebsd, "^/dev/ad(\\d+)s(\\d+)([a-z])$", 0);
COMPILE (re_netbsd, "^NetBSD (\\d+)\\.(\\d+)", 0);
}
static void
free_regexps (void)
{
pcre_free (re_fedora);
pcre_free (re_rhel_old);
pcre_free (re_rhel);
pcre_free (re_rhel_no_minor);
pcre_free (re_centos_old);
pcre_free (re_centos);
pcre_free (re_centos_no_minor);
pcre_free (re_scientific_linux_old);
pcre_free (re_scientific_linux);
pcre_free (re_scientific_linux_no_minor);
pcre_free (re_major_minor);
pcre_free (re_xdev);
pcre_free (re_cciss);
pcre_free (re_mdN);
pcre_free (re_freebsd);
pcre_free (re_netbsd);
}
static void check_architecture (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_unix (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs);
static int check_fstab (guestfs_h *g, struct inspect_fs *fs);
static int add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
const char *spec, const char *mp,
Hash_table *md_map);
static char *resolve_fstab_device (guestfs_h *g, const char *spec,
Hash_table *md_map);
static int inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs, const char **configfiles, int (*f) (guestfs_h *, struct inspect_fs *));
/* Hash structure for uuid->path lookups */
typedef struct md_uuid {
uint32_t uuid[4];
char *path;
} md_uuid;
static size_t uuid_hash(const void *x, size_t table_size);
static bool uuid_cmp(const void *x, const void *y);
static void md_uuid_free(void *x);
static int parse_uuid(const char *str, uint32_t *uuid);
/* Hash structure for path(mdadm)->path(appliance) lookup */
typedef struct {
char *mdadm;
char *app;
} mdadm_app;
static size_t mdadm_app_hash(const void *x, size_t table_size);
static bool mdadm_app_cmp(const void *x, const void *y);
static void mdadm_app_free(void *x);
static ssize_t map_app_md_devices (guestfs_h *g, Hash_table **map);
static int map_md_devices(guestfs_h *g, Hash_table **map);
/* Set fs->product_name to the first line of the release file. */
static int
parse_release_file (guestfs_h *g, struct inspect_fs *fs,
const char *release_filename)
{
fs->product_name = guestfs___first_line_of_file (g, release_filename);
if (fs->product_name == NULL)
return -1;
if (STREQ (fs->product_name, "")) {
free (fs->product_name);
fs->product_name = NULL;
error (g, _("release file %s is empty or malformed"), release_filename);
return -1;
}
return 0;
}
/* Ubuntu has /etc/lsb-release containing:
* DISTRIB_ID=Ubuntu # Distro
* DISTRIB_RELEASE=10.04 # Version
* DISTRIB_CODENAME=lucid
* DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS" # Product name
*
* [Ubuntu-derived ...] Linux Mint was found to have this:
* DISTRIB_ID=LinuxMint
* DISTRIB_RELEASE=10
* DISTRIB_CODENAME=julia
* DISTRIB_DESCRIPTION="Linux Mint 10 Julia"
* Linux Mint also has /etc/linuxmint/info with more information,
* but we can use the LSB file.
*
* Mandriva has:
* LSB_VERSION=lsb-4.0-amd64:lsb-4.0-noarch
* DISTRIB_ID=MandrivaLinux
* DISTRIB_RELEASE=2010.1
* DISTRIB_CODENAME=Henry_Farman
* DISTRIB_DESCRIPTION="Mandriva Linux 2010.1"
* Mandriva also has a normal release file called /etc/mandriva-release.
*/
static int
parse_lsb_release (guestfs_h *g, struct inspect_fs *fs)
{
const char *filename = "/etc/lsb-release";
int64_t size;
char **lines;
size_t i;
int r = 0;
/* Don't trust guestfs_head_n not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_SMALL_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_head_n (g, 10, filename);
if (lines == NULL)
return -1;
for (i = 0; lines[i] != NULL; ++i) {
if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=Ubuntu")) {
fs->distro = OS_DISTRO_UBUNTU;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=LinuxMint")) {
fs->distro = OS_DISTRO_LINUX_MINT;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=MandrivaLinux")) {
fs->distro = OS_DISTRO_MANDRIVA;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=\"Mageia\"")) {
fs->distro = OS_DISTRO_MAGEIA;
r = 1;
}
else if (STRPREFIX (lines[i], "DISTRIB_RELEASE=")) {
char *major, *minor;
if (match2 (g, &lines[i][16], re_major_minor, &major, &minor)) {
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
guestfs___free_string_list (lines);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1) {
guestfs___free_string_list (lines);
return -1;
}
}
}
else if (fs->product_name == NULL &&
(STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=\"") ||
STRPREFIX (lines[i], "DISTRIB_DESCRIPTION='"))) {
size_t len = strlen (lines[i]) - 21 - 1;
fs->product_name = safe_strndup (g, &lines[i][21], len);
r = 1;
}
else if (fs->product_name == NULL &&
STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=")) {
size_t len = strlen (lines[i]) - 20;
fs->product_name = safe_strndup (g, &lines[i][20], len);
r = 1;
}
}
guestfs___free_string_list (lines);
/* The unnecessary construct in the next line is required to
* workaround -Wstrict-overflow warning in gcc 4.5.1.
*/
return r ? 1 : 0;
}
/* The currently mounted device is known to be a Linux root. Try to
* determine from this the distro, version, etc. Also parse
* /etc/fstab to determine the arrangement of mountpoints and
* associated devices.
*/
int
guestfs___check_linux_root (guestfs_h *g, struct inspect_fs *fs)
{
int r;
fs->type = OS_TYPE_LINUX;
if (guestfs_exists (g, "/etc/lsb-release") > 0) {
r = parse_lsb_release (g, fs);
if (r == -1) /* error */
return -1;
if (r == 1) /* ok - detected the release from this file */
goto skip_release_checks;
}
if (guestfs_exists (g, "/etc/redhat-release") > 0) {
fs->distro = OS_DISTRO_REDHAT_BASED; /* Something generic Red Hat-like. */
if (parse_release_file (g, fs, "/etc/redhat-release") == -1)
return -1;
char *major, *minor;
if ((major = match1 (g, fs->product_name, re_fedora)) != NULL) {
fs->distro = OS_DISTRO_FEDORA;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
}
else if (match2 (g, fs->product_name, re_rhel_old, &major, &minor) ||
match2 (g, fs->product_name, re_rhel, &major, &minor)) {
fs->distro = OS_DISTRO_RHEL;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_rhel_no_minor)) != NULL) {
fs->distro = OS_DISTRO_RHEL;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
else if (match2 (g, fs->product_name, re_centos_old, &major, &minor) ||
match2 (g, fs->product_name, re_centos, &major, &minor)) {
fs->distro = OS_DISTRO_CENTOS;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_centos_no_minor)) != NULL) {
fs->distro = OS_DISTRO_CENTOS;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
else if (match2 (g, fs->product_name, re_scientific_linux_old, &major, &minor) ||
match2 (g, fs->product_name, re_scientific_linux, &major, &minor)) {
fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_scientific_linux_no_minor)) != NULL) {
fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
}
else if (guestfs_exists (g, "/etc/debian_version") > 0) {
fs->distro = OS_DISTRO_DEBIAN;
if (parse_release_file (g, fs, "/etc/debian_version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/pardus-release") > 0) {
fs->distro = OS_DISTRO_PARDUS;
if (parse_release_file (g, fs, "/etc/pardus-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/arch-release") > 0) {
fs->distro = OS_DISTRO_ARCHLINUX;
/* /etc/arch-release file is empty and I can't see a way to
* determine the actual release or product string.
*/
}
else if (guestfs_exists (g, "/etc/gentoo-release") > 0) {
fs->distro = OS_DISTRO_GENTOO;
if (parse_release_file (g, fs, "/etc/gentoo-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/meego-release") > 0) {
fs->distro = OS_DISTRO_MEEGO;
if (parse_release_file (g, fs, "/etc/meego-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/slackware-version") > 0) {
fs->distro = OS_DISTRO_SLACKWARE;
if (parse_release_file (g, fs, "/etc/slackware-version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/ttylinux-target") > 0) {
fs->distro = OS_DISTRO_TTYLINUX;
if (parse_release_file (g, fs, "/etc/ttylinux-target") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_exists (g, "/etc/SuSE-release") > 0) {
fs->distro = OS_DISTRO_OPENSUSE;
if (parse_release_file (g, fs, "/etc/SuSE-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Buildroot (http://buildroot.net) is an embedded Linux distro
* toolkit. It is used by specific distros such as Cirros.
*/
else if (guestfs_exists (g, "/etc/br-version") > 0) {
if (guestfs_exists (g, "/usr/share/cirros/logo") > 0)
fs->distro = OS_DISTRO_CIRROS;
else
fs->distro = OS_DISTRO_BUILDROOT;
/* /etc/br-version has the format YYYY.MM[-git/hg/svn release] */
if (parse_release_file (g, fs, "/etc/br-version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
skip_release_checks:;
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test
* for Linux root above. We must now parse this file to determine
* which filesystems are used by the operating system and how they
* are mounted.
*/
const char *configfiles[] = { "/etc/fstab", "/etc/mdadm.conf", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device is known to be a FreeBSD root. */
int
guestfs___check_freebsd_root (guestfs_h *g, struct inspect_fs *fs)
{
fs->type = OS_TYPE_FREEBSD;
/* FreeBSD has no authoritative version file. The version number is
* in /etc/motd, which the system administrator might edit, but
* we'll use that anyway.
*/
if (guestfs_exists (g, "/etc/motd") > 0) {
if (parse_release_file (g, fs, "/etc/motd") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test above. */
const char *configfiles[] = { "/etc/fstab", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device is maybe to be a *BSD root. */
int
guestfs___check_netbsd_root (guestfs_h *g, struct inspect_fs *fs)
{
if (guestfs_exists (g, "/etc/release") > 0) {
char *major, *minor;
if (parse_release_file (g, fs, "/etc/release") == -1)
return -1;
if (match2 (g, fs->product_name, re_netbsd, &major, &minor)) {
fs->type = OS_TYPE_NETBSD;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
} else {
return -1;
}
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test above. */
const char *configfiles[] = { "/etc/fstab", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device may be a Hurd root. Hurd has distros
* just like Linux.
*/
int
guestfs___check_hurd_root (guestfs_h *g, struct inspect_fs *fs)
{
fs->type = OS_TYPE_HURD;
if (guestfs_exists (g, "/etc/debian_version") > 0) {
fs->distro = OS_DISTRO_DEBIAN;
if (parse_release_file (g, fs, "/etc/debian_version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Arch Hurd also exists, but inconveniently it doesn't have
* the normal /etc/arch-release file. XXX
*/
/* Determine the architecture. */
check_architecture (g, fs);
/* XXX Check for /etc/fstab. */
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
static void
check_architecture (guestfs_h *g, struct inspect_fs *fs)
{
const char *binaries[] =
{ "/bin/bash", "/bin/ls", "/bin/echo", "/bin/rm", "/bin/sh" };
size_t i;
for (i = 0; i < sizeof binaries / sizeof binaries[0]; ++i) {
if (guestfs_is_file (g, binaries[i]) > 0) {
/* Ignore errors from file_architecture call. */
guestfs_error_handler_cb old_error_cb = g->error_cb;
g->error_cb = NULL;
char *arch = guestfs_file_architecture (g, binaries[i]);
g->error_cb = old_error_cb;
if (arch) {
/* String will be owned by handle, freed by
* guestfs___free_inspect_info.
*/
fs->arch = arch;
break;
}
}
}
}
/* Try several methods to determine the hostname from a Linux or
* FreeBSD guest. Note that type and distro have been set, so we can
* use that information to direct the search.
*/
static int
check_hostname_unix (guestfs_h *g, struct inspect_fs *fs)
{
switch (fs->type) {
case OS_TYPE_LINUX:
case OS_TYPE_HURD:
/* Red Hat-derived would be in /etc/sysconfig/network, and
* Debian-derived in the file /etc/hostname. Very old Debian and
* SUSE use /etc/HOSTNAME. It's best to just look for each of
* these files in turn, rather than try anything clever based on
* distro.
*/
if (guestfs_is_file (g, "/etc/HOSTNAME")) {
fs->hostname = guestfs___first_line_of_file (g, "/etc/HOSTNAME");
if (fs->hostname == NULL)
return -1;
if (STREQ (fs->hostname, "")) {
free (fs->hostname);
fs->hostname = NULL;
}
}
if (!fs->hostname && guestfs_is_file (g, "/etc/hostname")) {
fs->hostname = guestfs___first_line_of_file (g, "/etc/hostname");
if (fs->hostname == NULL)
return -1;
if (STREQ (fs->hostname, "")) {
free (fs->hostname);
fs->hostname = NULL;
}
}
if (!fs->hostname && guestfs_is_file (g, "/etc/sysconfig/network")) {
const char *configfiles[] = { "/etc/sysconfig/network", NULL };
if (inspect_with_augeas (g, fs, configfiles,
check_hostname_redhat) == -1)
return -1;
}
break;
case OS_TYPE_FREEBSD:
case OS_TYPE_NETBSD:
/* /etc/rc.conf contains the hostname, but there is no Augeas lens
* for this file.
*/
if (guestfs_is_file (g, "/etc/rc.conf")) {
if (check_hostname_freebsd (g, fs) == -1)
return -1;
}
break;
case OS_TYPE_WINDOWS: /* not here, see check_windows_system_registry */
case OS_TYPE_DOS:
case OS_TYPE_UNKNOWN:
default:
/* nothing, keep GCC warnings happy */;
}
return 0;
}
/* Parse the hostname from /etc/sysconfig/network. This must be called
* from the inspect_with_augeas wrapper.
*/
static int
check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs)
{
char *hostname;
/* Errors here are not fatal (RHBZ#726739), since it could be
* just missing HOSTNAME field in the file.
*/
guestfs_error_handler_cb old_error_cb = g->error_cb;
g->error_cb = NULL;
hostname = guestfs_aug_get (g, "/files/etc/sysconfig/network/HOSTNAME");
g->error_cb = old_error_cb;
/* This is freed by guestfs___free_inspect_info. Note that hostname
* could be NULL because we ignored errors above.
*/
fs->hostname = hostname;
return 0;
}
/* Parse the hostname from /etc/rc.conf. On FreeBSD this file
* contains comments, blank lines and:
* hostname="freebsd8.example.com"
* ifconfig_re0="DHCP"
* keymap="uk.iso"
* sshd_enable="YES"
*/
static int
check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs)
{
const char *filename = "/etc/rc.conf";
int64_t size;
char **lines;
size_t i;
/* Don't trust guestfs_read_lines not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_SMALL_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_read_lines (g, filename);
if (lines == NULL)
return -1;
for (i = 0; lines[i] != NULL; ++i) {
if (STRPREFIX (lines[i], "hostname=\"") ||
STRPREFIX (lines[i], "hostname='")) {
size_t len = strlen (lines[i]) - 10 - 1;
fs->hostname = safe_strndup (g, &lines[i][10], len);
break;
} else if (STRPREFIX (lines[i], "hostname=")) {
size_t len = strlen (lines[i]) - 9;
fs->hostname = safe_strndup (g, &lines[i][9], len);
break;
}
}
guestfs___free_string_list (lines);
return 0;
}
static int
check_fstab (guestfs_h *g, struct inspect_fs *fs)
{
char **entries, **entry;
char augpath[256];
char *spec, *mp;
int r;
/* Generate a map of MD device paths listed in /etc/mdadm.conf to MD device
* paths in the guestfs appliance */
Hash_table *md_map;
if (map_md_devices (g, &md_map) == -1) return -1;
entries = guestfs_aug_match (g, "/files/etc/fstab/*[label() != '#comment']");
if (entries == NULL) goto error;
if (entries[0] == NULL) {
error (g, _("could not parse /etc/fstab or empty file"));
goto error;
}
for (entry = entries; *entry != NULL; entry++) {
snprintf (augpath, sizeof augpath, "%s/spec", *entry);
spec = guestfs_aug_get (g, augpath);
if (spec == NULL) goto error;
snprintf (augpath, sizeof augpath, "%s/file", *entry);
mp = guestfs_aug_get (g, augpath);
if (mp == NULL) {
free (spec);
goto error;
}
r = add_fstab_entry (g, fs, spec, mp, md_map);
free (spec);
free (mp);
if (r == -1) goto error;
}
if (md_map) hash_free (md_map);
guestfs___free_string_list (entries);
return 0;
error:
if (md_map) hash_free (md_map);
if (entries) guestfs___free_string_list (entries);
return -1;
}
/* Add a filesystem and possibly a mountpoint entry for
* the root filesystem 'fs'.
*
* 'spec' is the fstab spec field, which might be a device name or a
* pseudodevice or 'UUID=...' or 'LABEL=...'.
*
* 'mp' is the mount point, which could also be 'swap' or 'none'.
*/
static int
add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
const char *spec, const char *mp, Hash_table *md_map)
{
/* Ignore certain mountpoints. */
if (STRPREFIX (mp, "/dev/") ||
STREQ (mp, "/dev") ||
STRPREFIX (mp, "/media/") ||
STRPREFIX (mp, "/proc/") ||
STREQ (mp, "/proc") ||
STRPREFIX (mp, "/selinux/") ||
STREQ (mp, "/selinux") ||
STRPREFIX (mp, "/sys/") ||
STREQ (mp, "/sys"))
return 0;
/* Ignore /dev/fd (floppy disks) (RHBZ#642929) and CD-ROM drives. */
if ((STRPREFIX (spec, "/dev/fd") && c_isdigit (spec[7])) ||
STREQ (spec, "/dev/floppy") ||
STREQ (spec, "/dev/cdrom"))
return 0;
/* Resolve UUID= and LABEL= to the actual device. */
char *device = NULL;
if (STRPREFIX (spec, "UUID="))
device = guestfs_findfs_uuid (g, &spec[5]);
else if (STRPREFIX (spec, "LABEL="))
device = guestfs_findfs_label (g, &spec[6]);
/* Ignore "/.swap" (Pardus) and pseudo-devices like "tmpfs". */
else if (STREQ (spec, "/dev/root"))
/* Resolve /dev/root to the current device. */
device = safe_strdup (g, fs->device);
else if (STRPREFIX (spec, "/dev/"))
/* Resolve guest block device names. */
device = resolve_fstab_device (g, spec, md_map);
/* If we haven't resolved the device successfully by this point,
* we don't care, just ignore it.
*/
if (device == NULL)
return 0;
char *mountpoint = safe_strdup (g, mp);
/* Add this to the fstab entry in 'fs'.
* Note these are further filtered by guestfs_inspect_get_mountpoints
* and guestfs_inspect_get_filesystems.
*/
size_t n = fs->nr_fstab + 1;
struct inspect_fstab_entry *p;
p = realloc (fs->fstab, n * sizeof (struct inspect_fstab_entry));
if (p == NULL) {
perrorf (g, "realloc");
free (device);
free (mountpoint);
return -1;
}
fs->fstab = p;
fs->nr_fstab = n;
/* These are owned by the handle and freed by guestfs___free_inspect_info. */
fs->fstab[n-1].device = device;
fs->fstab[n-1].mountpoint = mountpoint;
debug (g, "fstab: device=%s mountpoint=%s", device, mountpoint);
return 0;
}
/* Compute a uuid hash as a simple xor of of its 4 32bit components */
static size_t
uuid_hash(const void *x, size_t table_size)
{
const md_uuid *a = x;
size_t h = a->uuid[0];
for (size_t i = 1; i < 4; i++) {
h ^= a->uuid[i];
}
return h % table_size;
}
static bool
uuid_cmp(const void *x, const void *y)
{
const md_uuid *a = x;
const md_uuid *b = y;
for (size_t i = 0; i < 1; i++) {
if (a->uuid[i] != b->uuid[i]) return 0;
}
return 1;
}
static void
md_uuid_free(void *x)
{
md_uuid *a = x;
free(a->path);
free(a);
}
/* Taken from parse_uuid in mdadm */
static int
parse_uuid (const char *str, uint32_t *uuid)
{
size_t hit = 0; /* number of Hex digIT */
char c;
size_t i;
int n;
for (i = 0; i < 4; i++)
uuid[i] = 0;
while ((c = *str++)) {
if (c >= '0' && c <= '9')
n = c - '0';
else if (c >= 'a' && c <= 'f')
n = 10 + c - 'a';
else if (c >= 'A' && c <= 'F')
n = 10 + c - 'A';
else if (strchr (":. -", c))
continue;
else
return -1;
if (hit < 32) {
uuid[hit / 8] <<= 4;
uuid[hit / 8] += n;
}
hit++;
}
if (hit == 32) return 0;
return -1;
}
/* Create a mapping of uuids to appliance md device names */
static ssize_t
map_app_md_devices (guestfs_h *g, Hash_table **map)
{
char **mds = NULL;
size_t n = 0;
/* A hash mapping uuids to md device names */
*map = hash_initialize(16, NULL, uuid_hash, uuid_cmp, md_uuid_free);
if (*map == NULL) g->abort_cb();
mds = guestfs_list_md_devices(g);
if (mds == NULL) goto error;
for (char **md = mds; *md != NULL; md++) {
char **detail = guestfs_md_detail(g, *md);
if (detail == NULL) goto error;
/* Iterate over keys until we find uuid */
char **i;
for (i = detail; *i != NULL; i += 2) {
if (STREQ(*i, "uuid")) break;
}
/* We found it */
if (*i) {
/* Next item is the uuid value */
i++;
md_uuid *entry = safe_malloc(g, sizeof(md_uuid));
entry->path = safe_strdup(g, *md);
if (parse_uuid(*i, entry->uuid) == -1) {
/* Invalid UUID is weird, but not fatal. */
debug(g, "inspect-os: guestfs_md_detail returned invalid "
"uuid for %s: %s", *md, *i);
guestfs___free_string_list(detail);
md_uuid_free(entry);
continue;
}
const void *matched = NULL;
switch (hash_insert_if_absent(*map, entry, &matched)) {
case -1:
g->abort_cb();
case 0:
/* Duplicate uuid in for md device is weird, but not fatal. */
debug(g, "inspect-os: md devices %s and %s have the same uuid",
((md_uuid *)matched)->path, entry->path);
md_uuid_free(entry);
break;
default:
n++;
}
}
guestfs___free_string_list(detail);
}
guestfs___free_string_list(mds);
return n;
error:
hash_free(*map); *map = NULL;
guestfs___free_string_list(mds);
return -1;
}
static size_t
mdadm_app_hash(const void *x, size_t table_size)
{
const mdadm_app *a = x;
return hash_pjw(a->mdadm, table_size);
}
static bool
mdadm_app_cmp(const void *x, const void *y)
{
const mdadm_app *a = x;
const mdadm_app *b = y;
return strcmp(a->mdadm, b->mdadm) == 0;
}
static void
mdadm_app_free(void *x)
{
mdadm_app *a = x;
free(a->mdadm);
free(a->app);
free(a);
}
/* Get a map of md device names in mdadm.conf to their device names in the
* appliance */
static int
map_md_devices(guestfs_h *g, Hash_table **map)
{
Hash_table *app_map = NULL;
char **matches = NULL;
ssize_t n_app_md_devices;
*map = NULL;
/* Get a map of md device uuids to their device names in the appliance */
n_app_md_devices = map_app_md_devices (g, &app_map);
if (n_app_md_devices == -1) goto error;
/* Nothing to do if there are no md devices */
if (n_app_md_devices == 0) {
hash_free(app_map);
return 0;
}
/* Get all arrays listed in mdadm.conf */
matches = guestfs_aug_match(g, "/files/etc/mdadm.conf/array");
if (!matches) goto error;
/* Log a debug message if we've got md devices, but nothing in mdadm.conf */
if (matches[0] == NULL) {
debug(g, "Appliance has MD devices, but augeas returned no array matches "
"in mdadm.conf");
guestfs___free_string_list(matches);
hash_free(app_map);
return 0;
}
*map = hash_initialize(16, NULL, mdadm_app_hash, mdadm_app_cmp,
mdadm_app_free);
if (!*map) g->abort_cb();
for (char **match = matches; *match != NULL; match++) {
/* Get device name and uuid for each array */
char *dev_path = safe_asprintf(g, "%s/devicename", *match);
char *dev = guestfs_aug_get(g, dev_path);
free(dev_path);
if (!dev) goto error;
char *uuid_path = safe_asprintf(g, "%s/uuid", *match);
char *uuid = guestfs_aug_get(g, uuid_path);
free(uuid_path);
if (!uuid) {
free(dev);
continue;
}
/* Parse the uuid into an md_uuid structure so we can look it up in the
* uuid->appliance device map */
md_uuid mdadm;
mdadm.path = dev;
if (parse_uuid(uuid, mdadm.uuid) == -1) {
/* Invalid uuid. Weird, but not fatal. */
debug(g, "inspect-os: mdadm.conf contains invalid uuid for %s: %s",
dev, uuid);
free(dev);
free(uuid);
continue;
}
free(uuid);
/* If there's a corresponding uuid in the appliance, create a new
* entry in the transitive map */
md_uuid *app = hash_lookup(app_map, &mdadm);
if (app) {
mdadm_app *entry = safe_malloc(g, sizeof(mdadm_app));
entry->mdadm = dev;
entry->app = safe_strdup(g, app->path);
switch (hash_insert_if_absent(*map, entry, NULL)) {
case -1:
g->abort_cb();
case 0:
/* Duplicate uuid in for md device is weird, but not fatal. */
debug(g, "inspect-os: mdadm.conf contains multiple entries for %s",
app->path);
mdadm_app_free(entry);
continue;
default:
;;
}
} else {
free(dev);
}
}
hash_free(app_map);
guestfs___free_string_list(matches);
return 0;
error:
if (app_map) hash_free(app_map);
if (matches) guestfs___free_string_list(matches);
if (*map) hash_free(*map);
return -1;
}
/* Resolve block device name to the libguestfs device name, eg.
* /dev/xvdb1 => /dev/vdb1; and /dev/mapper/VG-LV => /dev/VG/LV. This
* assumes that disks were added in the same order as they appear to
* the real VM, which is a reasonable assumption to make. Return
* anything we don't recognize unchanged.
*/
static char *
resolve_fstab_device (guestfs_h *g, const char *spec, Hash_table *md_map)
{
char *device = NULL;
char *type, *slice, *disk, *part;
if (STRPREFIX (spec, "/dev/mapper/") && guestfs_exists (g, spec) > 0) {
/* LVM2 does some strange munging on /dev/mapper paths for VGs and
* LVs which contain '-' character:
*
* ><fs> lvcreate LV--test VG--test 32
* ><fs> debug ls /dev/mapper
* VG----test-LV----test
*
* This makes it impossible to reverse those paths directly, so
* we have implemented lvm_canonical_lv_name in the daemon.
*/
device = guestfs_lvm_canonical_lv_name (g, spec);
}
else if (match3 (g, spec, re_xdev, &type, &disk, &part)) {
/* type: (h|s|v|xv)
* disk: ([a-z]+)
* part: (\d*) */
char **devices = guestfs_list_devices (g);
if (devices == NULL)
return NULL;
/* Check any hints we were passed for a non-heuristic mapping */
char *name = safe_asprintf (g, "%sd%s", type, disk);
size_t i = 0;
struct drive *drive = g->drives;
while (drive) {
if (drive->name && STREQ(drive->name, name)) {
device = safe_asprintf (g, "%s%s", devices[i], part);
break;
}
i++; drive = drive->next;
}
free (name);
/* Guess the appliance device name if we didn't find a matching hint */
if (!device) {
/* Count how many disks the libguestfs appliance has */
size_t count;
for (count = 0; devices[count] != NULL; count++)
;
/* Calculate the numerical index of the disk */
i = disk[0] - 'a';
for (char *p = disk + 1; *p != '\0'; p++) {
i += 1; i *= 26;
i += *p - 'a';
}
/* Check the index makes sense wrt the number of disks the appliance has.
* If it does, map it to an appliance disk. */
if (i < count) {
device = safe_asprintf (g, "%s%s", devices[i], part);
}
}
free (type);
free (disk);
free (part);
guestfs___free_string_list (devices);
}
else if (match2 (g, spec, re_cciss, &disk, &part)) {
/* disk: (cciss/c\d+d\d+)
* part: (\d+)? */
char **devices = guestfs_list_devices (g);
if (devices == NULL)
return NULL;
/* Check any hints we were passed for a non-heuristic mapping */
size_t i = 0;
struct drive *drive = g->drives;
while (drive) {
if (drive->name && STREQ(drive->name, disk)) {
if (part) {
device = safe_asprintf (g, "%s%s", devices[i], part);
} else {
device = safe_strdup (g, devices[i]);
}
break;
}
i++; drive = drive->next;
}
/* We don't try to guess mappings for cciss devices */
free (disk);
free (part);
guestfs___free_string_list (devices);
}
else if (md_map && (disk = match1 (g, spec, re_mdN)) != NULL) {
mdadm_app entry;
entry.mdadm = disk;
mdadm_app *app = hash_lookup (md_map, &entry);
if (app) device = safe_strdup (g, app->app);
free(disk);
}
else if (match3 (g, spec, re_freebsd, &disk, &slice, &part)) {
/* FreeBSD disks are organized quite differently. See:
* http://www.freebsd.org/doc/handbook/disk-organization.html
* FreeBSD "partitions" are exposed as quasi-extended partitions
* numbered from 5 in Linux. I have no idea what happens when you
* have multiple "slices" (the FreeBSD term for MBR partitions).
*/
int disk_i = guestfs___parse_unsigned_int (g, disk);
int slice_i = guestfs___parse_unsigned_int (g, slice);
int part_i = part[0] - 'a' /* counting from 0 */;
free (disk);
free (slice);
free (part);
if (disk_i != -1 && disk_i <= 26 &&
slice_i > 0 && slice_i <= 1 /* > 4 .. see comment above */ &&
part_i >= 0 && part_i < 26) {
device = safe_asprintf (g, "/dev/sd%c%d", disk_i + 'a', part_i + 5);
}
}
/* Didn't match device pattern, return original spec unchanged. */
if (device == NULL)
device = safe_strdup (g, spec);
return device;
}
/* Call 'f' with Augeas opened and having parsed 'filename' (this file
* must exist). As a security measure, this bails if the file is too
* large for a reasonable configuration file. After the call to 'f'
* Augeas is closed.
*/
static int
inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs,
const char **configfiles,
int (*f) (guestfs_h *, struct inspect_fs *))
{
/* Security: Refuse to do this if a config file is too large. */
for (const char **i = configfiles; *i != NULL; i++) {
if (guestfs_exists(g, *i) == 0) continue;
int64_t size = guestfs_filesize (g, *i);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_AUGEAS_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
*i, size);
return -1;
}
}
/* If !feature_available (g, "augeas") then the next call will fail.
* Arguably we might want to fall back to a non-Augeas method in
* this case.
*/
if (guestfs_aug_init (g, "/", 16|32) == -1)
return -1;
int r = -1;
/* Tell Augeas to only load one file (thanks Raphaël Pinson). */
#define AUGEAS_LOAD "/augeas/load//incl[. != \""
#define AUGEAS_LOAD_LEN (strlen(AUGEAS_LOAD))
size_t conflen = strlen(configfiles[0]);
size_t buflen = AUGEAS_LOAD_LEN + conflen + 1 /* Closing " */;
char *buf = safe_malloc(g, buflen + 2 /* Closing ] + null terminator */);
memcpy(buf, AUGEAS_LOAD, AUGEAS_LOAD_LEN);
memcpy(buf + AUGEAS_LOAD_LEN, configfiles[0], conflen);
buf[buflen - 1] = '"';
#undef AUGEAS_LOAD_LEN
#undef AUGEAS_LOAD
#define EXCL " and . != \""
#define EXCL_LEN (strlen(EXCL))
for (const char **i = &configfiles[1]; *i != NULL; i++) {
size_t orig_buflen = buflen;
conflen = strlen(*i);
buflen += EXCL_LEN + conflen + 1 /* Closing " */;
buf = safe_realloc(g, buf, buflen + 2 /* Closing ] + null terminator */);
char *s = buf + orig_buflen;
memcpy(s, EXCL, EXCL_LEN);
memcpy(s + EXCL_LEN, *i, conflen);
buf[buflen - 1] = '"';
}
#undef EXCL_LEN
#undef EXCL
buf[buflen] = ']';
buf[buflen + 1] = '\0';
if (guestfs_aug_rm (g, buf) == -1) {
free(buf);
goto out;
}
free(buf);
if (guestfs_aug_load (g) == -1)
goto out;
r = f (g, fs);
out:
guestfs_aug_close (g);
return r;
}
#endif /* defined(HAVE_HIVEX) */