--- /dev/null
+/* libguestfs
+ * Copyright (C) 2010-2011 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>
+
+#ifdef HAVE_PCRE
+#include <pcre.h>
+#endif
+
+#ifdef HAVE_HIVEX
+#include <hivex.h>
+#endif
+
+#include "c-ctype.h"
+#include "ignore-value.h"
+#include "xstrtol.h"
+
+#include "guestfs.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-actions.h"
+#include "guestfs_protocol.h"
+
+#if defined(HAVE_PCRE) && 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_first_partition;
+static pcre *re_major_minor;
+
+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_first_partition, "^/dev/(?:h|s|v)d.1$", 0);
+ COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0);
+}
+
+static void
+free_regexps (void)
+{
+ pcre_free (re_first_partition);
+ pcre_free (re_major_minor);
+}
+
+static int check_filesystem (guestfs_h *g, const char *device, int is_block, int is_partnum);
+static void check_package_format (guestfs_h *g, struct inspect_fs *fs);
+static void check_package_management (guestfs_h *g, struct inspect_fs *fs);
+static int extend_fses (guestfs_h *g);
+static int is_file_nocase (guestfs_h *g, const char *);
+static int is_dir_nocase (guestfs_h *g, const char *);
+
+/* Find out if 'device' contains a filesystem. If it does, add
+ * another entry in g->fses.
+ */
+int
+guestfs___check_for_filesystem_on (guestfs_h *g, const char *device,
+ int is_block, int is_partnum)
+{
+ /* Get vfs-type in order to check if it's a Linux(?) swap device.
+ * If there's an error we should ignore it, so to do that we have to
+ * temporarily replace the error handler with a null one.
+ */
+ guestfs_error_handler_cb old_error_cb = g->error_cb;
+ g->error_cb = NULL;
+ char *vfs_type = guestfs_vfs_type (g, device);
+ g->error_cb = old_error_cb;
+
+ int is_swap = vfs_type && STREQ (vfs_type, "swap");
+
+ debug (g, "check_for_filesystem_on: %s %d %d (%s)",
+ device, is_block, is_partnum,
+ vfs_type ? vfs_type : "failed to get vfs type");
+
+ if (is_swap) {
+ free (vfs_type);
+ if (extend_fses (g) == -1)
+ return -1;
+ g->fses[g->nr_fses-1].is_swap = 1;
+ return 0;
+ }
+
+ /* Try mounting the device. As above, ignore errors. */
+ g->error_cb = NULL;
+ int r = guestfs_mount_ro (g, device, "/");
+ if (r == -1 && vfs_type && STREQ (vfs_type, "ufs")) /* Hack for the *BSDs. */
+ r = guestfs_mount_vfs (g, "ro,ufstype=ufs2", "ufs", device, "/");
+ free (vfs_type);
+ g->error_cb = old_error_cb;
+ if (r == -1)
+ return 0;
+
+ /* Do the rest of the checks. */
+ r = check_filesystem (g, device, is_block, is_partnum);
+
+ /* Unmount the filesystem. */
+ if (guestfs_umount_all (g) == -1)
+ return -1;
+
+ return r;
+}
+
+/* is_block and is_partnum are just hints: is_block is true if the
+ * filesystem is a whole block device (eg. /dev/sda). is_partnum
+ * is > 0 if the filesystem is a direct partition, and in this case
+ * it is the partition number counting from 1
+ * (eg. /dev/sda1 => is_partnum == 1).
+ */
+static int
+check_filesystem (guestfs_h *g, const char *device,
+ int is_block, int is_partnum)
+{
+ if (extend_fses (g) == -1)
+ return -1;
+
+ struct inspect_fs *fs = &g->fses[g->nr_fses-1];
+
+ fs->device = safe_strdup (g, device);
+ fs->is_mountable = 1;
+
+ /* Optimize some of the tests by avoiding multiple tests of the same thing. */
+ int is_dir_etc = guestfs_is_dir (g, "/etc") > 0;
+ int is_dir_bin = guestfs_is_dir (g, "/bin") > 0;
+ int is_dir_share = guestfs_is_dir (g, "/share") > 0;
+
+ /* Grub /boot? */
+ if (guestfs_is_file (g, "/grub/menu.lst") > 0 ||
+ guestfs_is_file (g, "/grub/grub.conf") > 0)
+ fs->content = FS_CONTENT_LINUX_BOOT;
+ /* FreeBSD root? */
+ else if (is_dir_etc &&
+ is_dir_bin &&
+ guestfs_is_file (g, "/etc/freebsd-update.conf") > 0 &&
+ guestfs_is_file (g, "/etc/fstab") > 0) {
+ /* Ignore /dev/sda1 which is a shadow of the real root filesystem
+ * that is probably /dev/sda5 (see:
+ * http://www.freebsd.org/doc/handbook/disk-organization.html)
+ */
+ if (match (g, device, re_first_partition))
+ return 0;
+
+ fs->is_root = 1;
+ fs->content = FS_CONTENT_FREEBSD_ROOT;
+ fs->format = OS_FORMAT_INSTALLED;
+ if (guestfs___check_freebsd_root (g, fs) == -1)
+ return -1;
+ }
+ /* Linux root? */
+ else if (is_dir_etc &&
+ is_dir_bin &&
+ guestfs_is_file (g, "/etc/fstab") > 0) {
+ fs->is_root = 1;
+ fs->content = FS_CONTENT_LINUX_ROOT;
+ fs->format = OS_FORMAT_INSTALLED;
+ if (guestfs___check_linux_root (g, fs) == -1)
+ return -1;
+ }
+ /* Linux /usr/local? */
+ else if (is_dir_etc &&
+ is_dir_bin &&
+ is_dir_share &&
+ guestfs_exists (g, "/local") == 0 &&
+ guestfs_is_file (g, "/etc/fstab") == 0)
+ fs->content = FS_CONTENT_LINUX_USR_LOCAL;
+ /* Linux /usr? */
+ else if (is_dir_etc &&
+ is_dir_bin &&
+ is_dir_share &&
+ guestfs_exists (g, "/local") > 0 &&
+ guestfs_is_file (g, "/etc/fstab") == 0)
+ fs->content = FS_CONTENT_LINUX_USR;
+ /* Linux /var? */
+ else if (guestfs_is_dir (g, "/log") > 0 &&
+ guestfs_is_dir (g, "/run") > 0 &&
+ guestfs_is_dir (g, "/spool") > 0)
+ fs->content = FS_CONTENT_LINUX_VAR;
+ /* Windows root?
+ * Note that if a Windows guest has multiple disks and applications
+ * are installed on those other disks, then those other disks will
+ * contain "/Program Files" and "/System Volume Information". Those
+ * would *not* be Windows root disks. (RHBZ#674130)
+ */
+ else if (is_file_nocase (g, "/AUTOEXEC.BAT") > 0 ||
+ is_dir_nocase (g, "/WINDOWS") > 0 ||
+ is_dir_nocase (g, "/WIN32") > 0 ||
+ is_dir_nocase (g, "/WINNT") > 0 ||
+ is_file_nocase (g, "/boot.ini") > 0 ||
+ is_file_nocase (g, "/ntldr") > 0) {
+ fs->is_root = 1;
+ fs->content = FS_CONTENT_WINDOWS_ROOT;
+ fs->format = OS_FORMAT_INSTALLED;
+ if (guestfs___check_windows_root (g, fs) == -1)
+ return -1;
+ }
+ /* Windows volume with installed applications (but not root)? */
+ else if (is_dir_nocase (g, "/System Volume Information") > 0 &&
+ is_dir_nocase (g, "/Program Files") > 0)
+ fs->content = FS_CONTENT_WINDOWS_VOLUME_WITH_APPS;
+ /* Windows volume (but not root)? */
+ else if (is_dir_nocase (g, "/System Volume Information") > 0)
+ fs->content = FS_CONTENT_WINDOWS_VOLUME;
+ /* Install CD/disk? Skip these checks if it's not a whole device
+ * (eg. CD) or the first partition (eg. bootable USB key).
+ */
+ else if ((is_block || is_partnum == 1) &&
+ (guestfs_is_file (g, "/isolinux/isolinux.cfg") > 0 ||
+ guestfs_is_dir (g, "/EFI/BOOT") > 0 ||
+ guestfs_is_file (g, "/images/install.img") > 0 ||
+ guestfs_is_dir (g, "/.disk") > 0 ||
+ guestfs_is_file (g, "/.discinfo") > 0 ||
+ guestfs_is_file (g, "/i386/txtsetup.sif") > 0 ||
+ guestfs_is_file (g, "/amd64/txtsetup.sif")) > 0) {
+ fs->is_root = 1;
+ fs->content = FS_CONTENT_INSTALLER;
+ fs->format = OS_FORMAT_INSTALLER;
+ if (guestfs___check_installer_root (g, fs) == -1)
+ return -1;
+ }
+
+ /* The above code should have set fs->type and fs->distro fields, so
+ * we can now guess the package management system.
+ */
+ check_package_format (g, fs);
+ check_package_management (g, fs);
+
+ return 0;
+}
+
+static int
+extend_fses (guestfs_h *g)
+{
+ size_t n = g->nr_fses + 1;
+ struct inspect_fs *p;
+
+ p = realloc (g->fses, n * sizeof (struct inspect_fs));
+ if (p == NULL) {
+ perrorf (g, "realloc");
+ return -1;
+ }
+
+ g->fses = p;
+ g->nr_fses = n;
+
+ memset (&g->fses[n-1], 0, sizeof (struct inspect_fs));
+
+ return 0;
+}
+
+static int
+is_file_nocase (guestfs_h *g, const char *path)
+{
+ char *p;
+ int r;
+
+ p = guestfs___case_sensitive_path_silently (g, path);
+ if (!p)
+ return 0;
+ r = guestfs_is_file (g, p);
+ free (p);
+ return r > 0;
+}
+
+static int
+is_dir_nocase (guestfs_h *g, const char *path)
+{
+ char *p;
+ int r;
+
+ p = guestfs___case_sensitive_path_silently (g, path);
+ if (!p)
+ return 0;
+ r = guestfs_is_dir (g, p);
+ free (p);
+ return r > 0;
+}
+
+/* Parse small, unsigned ints, as used in version numbers. */
+int
+guestfs___parse_unsigned_int (guestfs_h *g, const char *str)
+{
+ long ret;
+ int r = xstrtol (str, NULL, 10, &ret, "");
+ if (r != LONGINT_OK) {
+ error (g, _("could not parse integer in version number: %s"), str);
+ return -1;
+ }
+ return ret;
+}
+
+/* Like parse_unsigned_int, but ignore trailing stuff. */
+int
+guestfs___parse_unsigned_int_ignore_trailing (guestfs_h *g, const char *str)
+{
+ long ret;
+ int r = xstrtol (str, NULL, 10, &ret, NULL);
+ if (r != LONGINT_OK) {
+ error (g, _("could not parse integer in version number: %s"), str);
+ return -1;
+ }
+ return ret;
+}
+
+/* Parse generic MAJOR.MINOR from the fs->product_name string. */
+int
+guestfs___parse_major_minor (guestfs_h *g, struct inspect_fs *fs)
+{
+ char *major, *minor;
+
+ if (match2 (g, fs->product_name, re_major_minor, &major, &minor)) {
+ 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;
+ }
+ return 0;
+}
+
+/* At the moment, package format and package management is just a
+ * simple function of the distro and major_version fields, so these
+ * can never return an error. We might be cleverer in future.
+ */
+static void
+check_package_format (guestfs_h *g, struct inspect_fs *fs)
+{
+ switch (fs->distro) {
+ case OS_DISTRO_FEDORA:
+ case OS_DISTRO_MEEGO:
+ case OS_DISTRO_REDHAT_BASED:
+ case OS_DISTRO_RHEL:
+ case OS_DISTRO_MANDRIVA:
+ fs->package_format = OS_PACKAGE_FORMAT_RPM;
+ break;
+
+ case OS_DISTRO_DEBIAN:
+ case OS_DISTRO_UBUNTU:
+ case OS_DISTRO_LINUX_MINT:
+ fs->package_format = OS_PACKAGE_FORMAT_DEB;
+ break;
+
+ case OS_DISTRO_ARCHLINUX:
+ fs->package_format = OS_PACKAGE_FORMAT_PACMAN;
+ break;
+ case OS_DISTRO_GENTOO:
+ fs->package_format = OS_PACKAGE_FORMAT_EBUILD;
+ break;
+ case OS_DISTRO_PARDUS:
+ fs->package_format = OS_PACKAGE_FORMAT_PISI;
+ break;
+
+ case OS_DISTRO_SLACKWARE:
+ case OS_DISTRO_WINDOWS:
+ case OS_DISTRO_UNKNOWN:
+ default:
+ fs->package_format = OS_PACKAGE_FORMAT_UNKNOWN;
+ break;
+ }
+}
+
+static void
+check_package_management (guestfs_h *g, struct inspect_fs *fs)
+{
+ switch (fs->distro) {
+ case OS_DISTRO_FEDORA:
+ case OS_DISTRO_MEEGO:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_YUM;
+ break;
+
+ case OS_DISTRO_REDHAT_BASED:
+ case OS_DISTRO_RHEL:
+ if (fs->major_version >= 5)
+ fs->package_management = OS_PACKAGE_MANAGEMENT_YUM;
+ else
+ fs->package_management = OS_PACKAGE_MANAGEMENT_UP2DATE;
+ break;
+
+ case OS_DISTRO_DEBIAN:
+ case OS_DISTRO_UBUNTU:
+ case OS_DISTRO_LINUX_MINT:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_APT;
+ break;
+
+ case OS_DISTRO_ARCHLINUX:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_PACMAN;
+ break;
+ case OS_DISTRO_GENTOO:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_PORTAGE;
+ break;
+ case OS_DISTRO_PARDUS:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_PISI;
+ break;
+ case OS_DISTRO_MANDRIVA:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_URPMI;
+ break;
+
+ case OS_DISTRO_SLACKWARE:
+ case OS_DISTRO_WINDOWS:
+ case OS_DISTRO_UNKNOWN:
+ default:
+ fs->package_management = OS_PACKAGE_MANAGEMENT_UNKNOWN;
+ break;
+ }
+}
+
+/* Get the first line of a small file, without any trailing newline
+ * character.
+ */
+char *
+guestfs___first_line_of_file (guestfs_h *g, const char *filename)
+{
+ char **lines;
+ int64_t size;
+ char *ret;
+
+ /* 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 NULL;
+ if (size > MAX_SMALL_FILE_SIZE) {
+ error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
+ filename, size);
+ return NULL;
+ }
+
+ lines = guestfs_head_n (g, 1, filename);
+ if (lines == NULL)
+ return NULL;
+ if (lines[0] == NULL) {
+ error (g, _("%s: file is empty"), filename);
+ guestfs___free_string_list (lines);
+ return NULL;
+ }
+ /* lines[1] should be NULL because of '1' argument above ... */
+
+ ret = lines[0]; /* caller frees */
+ free (lines); /* free the array */
+
+ return ret;
+}
+
+/* Get the first matching line (using guestfs_egrep{,i}) of a small file,
+ * without any trailing newline character.
+ *
+ * Returns: 1 = returned a line (in *ret)
+ * 0 = no match
+ * -1 = error
+ */
+int
+guestfs___first_egrep_of_file (guestfs_h *g, const char *filename,
+ const char *eregex, int iflag, char **ret)
+{
+ char **lines;
+ int64_t size;
+ size_t i;
+
+ /* Don't trust guestfs_egrep 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 = (!iflag ? guestfs_egrep : guestfs_egrepi) (g, eregex, filename);
+ if (lines == NULL)
+ return -1;
+ if (lines[0] == NULL) {
+ guestfs___free_string_list (lines);
+ return 0;
+ }
+
+ *ret = lines[0]; /* caller frees */
+
+ /* free up any other matches and the array itself */
+ for (i = 1; lines[i] != NULL; ++i)
+ free (lines[i]);
+ free (lines);
+
+ return 1;
+}
+
+#endif /* defined(HAVE_PCRE) && defined(HAVE_HIVEX) */
git.annexia.org / libguestfs.git / blobdiff