/* libguestfs * Copyright (C) 2010 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 #include #include #include #include #include #include #include #include #include #include #include #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" /* 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_file_elf; static pcre *re_file_win64; static pcre *re_elf_ppc64; static pcre *re_fedora; static pcre *re_rhel_old; static pcre *re_rhel; static pcre *re_rhel_no_minor; static pcre *re_major_minor; static pcre *re_aug_seq; static pcre *re_xdev; static pcre *re_windows_version; 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_file_elf, "ELF.*(?:executable|shared object|relocatable), (.+?),", 0); COMPILE (re_elf_ppc64, "64.*PowerPC", 0); COMPILE (re_fedora, "Fedora release (\\d+)", 0); COMPILE (re_rhel_old, "(?:Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\\d+).*Update (\\d+)", 0); COMPILE (re_rhel, "(?:Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\\d+)\\.(\\d+)", 0); COMPILE (re_rhel_no_minor, "(?:Red Hat Enterprise Linux|CentOS|Scientific Linux).*release (\\d+)", 0); COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0); COMPILE (re_aug_seq, "/\\d+$", 0); COMPILE (re_xdev, "^/dev/(?:h|s|v|xv)d([a-z]\\d*)$", 0); COMPILE (re_windows_version, "^(\\d+)\\.(\\d+)", 0); } static void free_regexps (void) { pcre_free (re_file_elf); pcre_free (re_file_win64); pcre_free (re_elf_ppc64); pcre_free (re_fedora); pcre_free (re_rhel_old); pcre_free (re_rhel); pcre_free (re_rhel_no_minor); pcre_free (re_major_minor); pcre_free (re_aug_seq); pcre_free (re_xdev); pcre_free (re_windows_version); } /* Match a regular expression which contains no captures. Returns * true if it matches or false if it doesn't. */ static int match (guestfs_h *g, const char *str, const pcre *re) { size_t len = strlen (str); int vec[30], r; r = pcre_exec (re, NULL, str, len, 0, 0, vec, sizeof vec / sizeof vec[0]); if (r == PCRE_ERROR_NOMATCH) return 0; if (r != 1) { /* Internal error -- should not happen. */ fprintf (stderr, "libguestfs: %s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"\n", __FILE__, __func__, r, str); return 0; } return 1; } /* Match a regular expression which contains exactly one capture. If * the string matches, return the capture, otherwise return NULL. The * caller must free the result. */ static char * match1 (guestfs_h *g, const char *str, const pcre *re) { size_t len = strlen (str); int vec[30], r; r = pcre_exec (re, NULL, str, len, 0, 0, vec, sizeof vec / sizeof vec[0]); if (r == PCRE_ERROR_NOMATCH) return NULL; if (r != 2) { /* Internal error -- should not happen. */ fprintf (stderr, "libguestfs: %s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"\n", __FILE__, __func__, r, str); return NULL; } return safe_strndup (g, &str[vec[2]], vec[3]-vec[2]); } /* Match a regular expression which contains exactly two captures. */ static int match2 (guestfs_h *g, const char *str, const pcre *re, char **ret1, char **ret2) { size_t len = strlen (str); int vec[30], r; r = pcre_exec (re, NULL, str, len, 0, 0, vec, 30); if (r == PCRE_ERROR_NOMATCH) return 0; if (r != 3) { /* Internal error -- should not happen. */ fprintf (stderr, "libguestfs: %s: %s: internal error: pcre_exec returned unexpected error code %d when matching against the string \"%s\"\n", __FILE__, __func__, r, str); return 0; } *ret1 = safe_strndup (g, &str[vec[2]], vec[3]-vec[2]); *ret2 = safe_strndup (g, &str[vec[4]], vec[5]-vec[4]); return 1; } /* Convert output from 'file' command on ELF files to the canonical * architecture string. Caller must free the result. */ static char * canonical_elf_arch (guestfs_h *g, const char *elf_arch) { const char *r; if (strstr (elf_arch, "Intel 80386")) r = "i386"; else if (strstr (elf_arch, "Intel 80486")) r = "i486"; else if (strstr (elf_arch, "x86-64")) r = "x86_64"; else if (strstr (elf_arch, "AMD x86-64")) r = "x86_64"; else if (strstr (elf_arch, "SPARC32")) r = "sparc"; else if (strstr (elf_arch, "SPARC V9")) r = "sparc64"; else if (strstr (elf_arch, "IA-64")) r = "ia64"; else if (match (g, elf_arch, re_elf_ppc64)) r = "ppc64"; else if (strstr (elf_arch, "PowerPC")) r = "ppc"; else r = elf_arch; char *ret = safe_strdup (g, r); return ret; } static int is_regular_file (const char *filename) { struct stat statbuf; return lstat (filename, &statbuf) == 0 && S_ISREG (statbuf.st_mode); } /* Download and uncompress the cpio file to find binaries within. * Notes: * (1) Two lists must be identical. * (2) Implicit limit of 31 bytes for length of each element (see code * below). */ #define INITRD_BINARIES1 "bin/ls bin/rm bin/modprobe sbin/modprobe bin/sh bin/bash bin/dash bin/nash" #define INITRD_BINARIES2 {"bin/ls", "bin/rm", "bin/modprobe", "sbin/modprobe", "bin/sh", "bin/bash", "bin/dash", "bin/nash"} static char * cpio_arch (guestfs_h *g, const char *file, const char *path) { TMP_TEMPLATE_ON_STACK (dir); #define dir_len (strlen (dir)) #define initrd_len (dir_len + 16) char initrd[initrd_len]; #define cmd_len (dir_len + 256) char cmd[cmd_len]; #define bin_len (dir_len + 32) char bin[bin_len]; char *ret = NULL; const char *method; if (strstr (file, "gzip")) method = "zcat"; else if (strstr (file, "bzip2")) method = "bzcat"; else method = "cat"; if (mkdtemp (dir) == NULL) { perrorf (g, "mkdtemp"); goto out; } snprintf (initrd, initrd_len, "%s/initrd", dir); if (guestfs_download (g, path, initrd) == -1) goto out; snprintf (cmd, cmd_len, "cd %s && %s initrd | cpio --quiet -id " INITRD_BINARIES1, dir, method); int r = system (cmd); if (r == -1 || WEXITSTATUS (r) != 0) { perrorf (g, "cpio command failed"); goto out; } const char *bins[] = INITRD_BINARIES2; size_t i; for (i = 0; i < sizeof bins / sizeof bins[0]; ++i) { snprintf (bin, bin_len, "%s/%s", dir, bins[i]); if (is_regular_file (bin)) { int flags = g->verbose ? MAGIC_DEBUG : 0; flags |= MAGIC_ERROR | MAGIC_RAW; magic_t m = magic_open (flags); if (m == NULL) { perrorf (g, "magic_open"); goto out; } if (magic_load (m, NULL) == -1) { perrorf (g, "magic_load: default magic database file"); magic_close (m); goto out; } const char *line = magic_file (m, bin); if (line == NULL) { perrorf (g, "magic_file: %s", bin); magic_close (m); goto out; } char *elf_arch; if ((elf_arch = match1 (g, line, re_file_elf)) != NULL) { ret = canonical_elf_arch (g, elf_arch); free (elf_arch); magic_close (m); goto out; } magic_close (m); } } error (g, "file_architecture: could not determine architecture of cpio archive"); out: /* Free up the temporary directory. Note the directory name cannot * contain shell meta-characters because of the way it was * constructed above. */ snprintf (cmd, cmd_len, "rm -rf %s", dir); ignore_value (system (cmd)); return ret; #undef dir_len #undef initrd_len #undef cmd_len #undef bin_len } char * guestfs__file_architecture (guestfs_h *g, const char *path) { char *file = NULL; char *elf_arch = NULL; char *ret = NULL; /* Get the output of the "file" command. Note that because this * runs in the daemon, LANG=C so it's in English. */ file = guestfs_file (g, path); if (file == NULL) return NULL; if ((elf_arch = match1 (g, file, re_file_elf)) != NULL) ret = canonical_elf_arch (g, elf_arch); else if (strstr (file, "PE32 executable")) ret = safe_strdup (g, "i386"); else if (strstr (file, "PE32+ executable")) ret = safe_strdup (g, "x86_64"); else if (strstr (file, "cpio archive")) ret = cpio_arch (g, file, path); else error (g, "file_architecture: unknown architecture: %s", path); free (file); free (elf_arch); return ret; /* caller frees */ } /* The main inspection code. */ static int feature_available (guestfs_h *g, const char *feature); static void free_string_list (char **); static int check_for_filesystem_on (guestfs_h *g, const char *device); char ** guestfs__inspect_os (guestfs_h *g) { /* Remove any information previously stored in the handle. */ guestfs___free_inspect_info (g); if (guestfs_umount_all (g) == -1) return NULL; /* Iterate over all possible devices. Try to mount each * (read-only). Examine ones which contain filesystems and add that * information to the handle. */ /* Look to see if any devices directly contain filesystems (RHBZ#590167). */ char **devices; devices = guestfs_list_devices (g); if (devices == NULL) return NULL; size_t i; for (i = 0; devices[i] != NULL; ++i) { if (check_for_filesystem_on (g, devices[i]) == -1) { free_string_list (devices); guestfs___free_inspect_info (g); return NULL; } } free_string_list (devices); /* Look at all partitions. */ char **partitions; partitions = guestfs_list_partitions (g); if (partitions == NULL) { guestfs___free_inspect_info (g); return NULL; } for (i = 0; partitions[i] != NULL; ++i) { if (check_for_filesystem_on (g, partitions[i]) == -1) { free_string_list (partitions); guestfs___free_inspect_info (g); return NULL; } } free_string_list (partitions); /* Look at all LVs. */ if (feature_available (g, "lvm2")) { char **lvs; lvs = guestfs_lvs (g); if (lvs == NULL) { guestfs___free_inspect_info (g); return NULL; } for (i = 0; lvs[i] != NULL; ++i) { if (check_for_filesystem_on (g, lvs[i]) == -1) { free_string_list (lvs); guestfs___free_inspect_info (g); return NULL; } } free_string_list (lvs); } /* At this point we have, in the handle, a list of all filesystems * found and data about each one. Now we assemble the list of * filesystems which are root devices and return that to the user. */ size_t count = 0; for (i = 0; i < g->nr_fses; ++i) if (g->fses[i].is_root) count++; char **ret = calloc (count+1, sizeof (char *)); if (ret == NULL) { perrorf (g, "calloc"); guestfs___free_inspect_info (g); return NULL; } count = 0; for (i = 0; i < g->nr_fses; ++i) { if (g->fses[i].is_root) { ret[count] = safe_strdup (g, g->fses[i].device); count++; } } ret[count] = NULL; return ret; } void guestfs___free_inspect_info (guestfs_h *g) { size_t i; for (i = 0; i < g->nr_fses; ++i) { free (g->fses[i].device); free (g->fses[i].product_name); free (g->fses[i].arch); free (g->fses[i].windows_systemroot); size_t j; for (j = 0; j < g->fses[i].nr_fstab; ++j) { free (g->fses[i].fstab[j].device); free (g->fses[i].fstab[j].mountpoint); } free (g->fses[i].fstab); } free (g->fses); g->nr_fses = 0; g->fses = NULL; } static void free_string_list (char **argv) { size_t i; for (i = 0; argv[i] != NULL; ++i) free (argv[i]); free (argv); } /* In the Perl code this is a public function. */ static int feature_available (guestfs_h *g, const char *feature) { /* 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; const char *groups[] = { feature, NULL }; int r = guestfs_available (g, (char * const *) groups); g->error_cb = old_error_cb; return r == 0 ? 1 : 0; } /* Find out if 'device' contains a filesystem. If it does, add * another entry in g->fses. */ static int check_filesystem (guestfs_h *g, const char *device); static int check_linux_root (guestfs_h *g, struct inspect_fs *fs); static int check_fstab (guestfs_h *g, struct inspect_fs *fs); static int check_windows_root (guestfs_h *g, struct inspect_fs *fs); static int check_windows_arch (guestfs_h *g, struct inspect_fs *fs); static int check_windows_registry (guestfs_h *g, struct inspect_fs *fs); static char *resolve_windows_path_silently (guestfs_h *g, const char *); static int extend_fses (guestfs_h *g); static int parse_unsigned_int (guestfs_h *g, const char *str); static int add_fstab_entry (guestfs_h *g, struct inspect_fs *fs, const char *spec, const char *mp); static char *resolve_fstab_device (guestfs_h *g, const char *spec); static int check_for_filesystem_on (guestfs_h *g, const char *device) { /* 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"); if (g->verbose) fprintf (stderr, "check_for_filesystem_on: %s (%s)\n", device, 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); /* Unmount the filesystem. */ if (guestfs_umount_all (g) == -1) return -1; return r; } static int check_filesystem (guestfs_h *g, const char *device) { 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; /* 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; /* Linux root? */ else if (guestfs_is_dir (g, "/etc") > 0 && guestfs_is_dir (g, "/bin") > 0 && guestfs_is_file (g, "/etc/fstab") > 0) { fs->is_root = 1; fs->content = FS_CONTENT_LINUX_ROOT; if (check_linux_root (g, fs) == -1) return -1; } /* Linux /usr/local? */ else if (guestfs_is_dir (g, "/etc") > 0 && guestfs_is_dir (g, "/bin") > 0 && guestfs_is_dir (g, "/share") > 0 && guestfs_exists (g, "/local") == 0 && guestfs_is_file (g, "/etc/fstab") == 0) fs->content = FS_CONTENT_LINUX_USR_LOCAL; /* Linux /usr? */ else if (guestfs_is_dir (g, "/etc") > 0 && guestfs_is_dir (g, "/bin") > 0 && guestfs_is_dir (g, "/share") > 0 && 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? */ else if (guestfs_is_file (g, "/AUTOEXEC.BAT") > 0 || guestfs_is_file (g, "/autoexec.bat") > 0 || guestfs_is_dir (g, "/Program Files") > 0 || guestfs_is_dir (g, "/WINDOWS") > 0 || guestfs_is_dir (g, "/Windows") > 0 || guestfs_is_dir (g, "/windows") > 0 || guestfs_is_dir (g, "/WIN32") > 0 || guestfs_is_dir (g, "/Win32") > 0 || guestfs_is_dir (g, "/WINNT") > 0 || guestfs_is_file (g, "/boot.ini") > 0 || guestfs_is_file (g, "/ntldr") > 0) { fs->is_root = 1; fs->content = FS_CONTENT_WINDOWS_ROOT; if (check_windows_root (g, fs) == -1) return -1; } return 0; } /* 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) { char **product_name = guestfs_head_n (g, 1, release_filename); if (product_name == NULL) return -1; if (product_name[0] == NULL) { error (g, "%s: file is empty", release_filename); free_string_list (product_name); return -1; } /* Note that this string becomes owned by the handle and will * be freed by guestfs___free_inspect_info. */ fs->product_name = product_name[0]; free (product_name); return 0; } /* Parse generic MAJOR.MINOR from the fs->product_name string. */ static int 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 = parse_unsigned_int (g, major); free (major); if (fs->major_version == -1) { free (minor); return -1; } fs->minor_version = parse_unsigned_int (g, minor); free (minor); if (fs->minor_version == -1) 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 * In theory other distros could have this LSB file, but none do. */ static int parse_lsb_release (guestfs_h *g, struct inspect_fs *fs) { char **lines; size_t i; int r = 0; lines = guestfs_head_n (g, 10, "/etc/lsb-release"); 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 (STRPREFIX (lines[i], "DISTRIB_RELEASE=")) { char *major, *minor; if (match2 (g, &lines[i][16], re_major_minor, &major, &minor)) { fs->major_version = parse_unsigned_int (g, major); free (major); if (fs->major_version == -1) { free (minor); free_string_list (lines); return -1; } fs->minor_version = parse_unsigned_int (g, minor); free (minor); if (fs->minor_version == -1) { 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; } } free_string_list (lines); return r; } /* 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. */ static int 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 = 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 = parse_unsigned_int (g, major); free (major); if (fs->major_version == -1) { free (minor); return -1; } fs->minor_version = 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 = 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 (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 (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 (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 (parse_major_minor (g, fs) == -1) return -1; } skip_release_checks:; /* Determine the architecture. */ 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; } } } /* 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. * XXX What if !feature_available (g, "augeas")? */ if (guestfs_aug_init (g, "/", AUG_NO_LOAD|AUG_SAVE_NOOP) == -1) return -1; /* Tell Augeas to only load /etc/fstab (thanks Raphaël Pinson). */ guestfs_aug_rm (g, "/augeas/load//incl[. != \"/etc/fstab\"]"); guestfs_aug_load (g); r = check_fstab (g, fs); guestfs_aug_close (g); if (r == -1) return -1; return 0; } static int check_fstab (guestfs_h *g, struct inspect_fs *fs) { char **lines = guestfs_aug_ls (g, "/files/etc/fstab"); if (lines == NULL) return -1; if (lines[0] == NULL) { error (g, "could not parse /etc/fstab or empty file"); free_string_list (lines); return -1; } size_t i; char augpath[256]; for (i = 0; lines[i] != NULL; ++i) { /* Ignore comments. Only care about sequence lines which * match m{/\d+$}. */ if (match (g, lines[i], re_aug_seq)) { snprintf (augpath, sizeof augpath, "%s/spec", lines[i]); char *spec = guestfs_aug_get (g, augpath); if (spec == NULL) { free_string_list (lines); return -1; } snprintf (augpath, sizeof augpath, "%s/file", lines[i]); char *mp = guestfs_aug_get (g, augpath); if (mp == NULL) { free_string_list (lines); free (spec); return -1; } int r = add_fstab_entry (g, fs, spec, mp); free (spec); free (mp); if (r == -1) { free_string_list (lines); return -1; } } } free_string_list (lines); return 0; } /* 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) { /* 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 (STRPREFIX (spec, "/dev/")) /* Resolve guest block device names. */ device = resolve_fstab_device (g, spec); /* 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; if (g->verbose) fprintf (stderr, "fstab: device=%s mountpoint=%s\n", device, mountpoint); return 0; } /* 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) { char *a1; char *device = NULL; if (STRPREFIX (spec, "/dev/mapper/")) { /* LVM2 does some strange munging on /dev/mapper paths for VGs and * LVs which contain '-' character: * * > lvcreate LV--test VG--test 32 * > 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 ((a1 = match1 (g, spec, re_xdev)) != NULL) { char **devices = guestfs_list_devices (g); if (devices == NULL) return NULL; size_t count; for (count = 0; devices[count] != NULL; count++) ; size_t i = a1[0] - 'a'; /* a1[0] is always [a-z] because of regex. */ if (i < count) { size_t len = strlen (devices[i]) + strlen (a1) + 16; device = safe_malloc (g, len); snprintf (device, len, "%s%s", devices[i], &a1[1]); } free (a1); free_string_list (devices); } else { /* Didn't match device pattern, return original spec unchanged. */ device = safe_strdup (g, spec); } return device; } /* XXX Handling of boot.ini in the Perl version was pretty broken. It * essentially didn't do anything for modern Windows guests. * Therefore I've omitted all that code. */ static int check_windows_root (guestfs_h *g, struct inspect_fs *fs) { fs->type = OS_TYPE_WINDOWS; fs->distro = OS_DISTRO_WINDOWS; /* Try to find Windows systemroot using some common locations. */ const char *systemroots[] = { "/windows", "/winnt", "/win32", "/win" }; size_t i; char *systemroot = NULL; for (i = 0; systemroot == NULL && i < sizeof systemroots / sizeof systemroots[0]; ++i) { systemroot = resolve_windows_path_silently (g, systemroots[i]); } if (!systemroot) { error (g, _("cannot resolve Windows %%SYSTEMROOT%%")); return -1; } if (g->verbose) fprintf (stderr, "windows %%SYSTEMROOT%% = %s", systemroot); /* Freed by guestfs___free_inspect_info. */ fs->windows_systemroot = systemroot; if (check_windows_arch (g, fs) == -1) return -1; if (check_windows_registry (g, fs) == -1) return -1; return 0; } static int check_windows_arch (guestfs_h *g, struct inspect_fs *fs) { size_t len = strlen (fs->windows_systemroot) + 32; char cmd_exe[len]; snprintf (cmd_exe, len, "%s/system32/cmd.exe", fs->windows_systemroot); char *cmd_exe_path = resolve_windows_path_silently (g, cmd_exe); if (!cmd_exe_path) return 0; char *arch = guestfs_file_architecture (g, cmd_exe_path); free (cmd_exe_path); if (arch) fs->arch = arch; /* freed by guestfs___free_inspect_info */ return 0; } /* At the moment, pull just the ProductName and version numbers from * the registry. In future there is a case for making many more * registry fields available to callers. */ static int check_windows_registry (guestfs_h *g, struct inspect_fs *fs) { TMP_TEMPLATE_ON_STACK (dir); #define dir_len (strlen (dir)) #define software_hive_len (dir_len + 16) char software_hive[software_hive_len]; #define cmd_len (dir_len + 16) char cmd[cmd_len]; size_t len = strlen (fs->windows_systemroot) + 64; char software[len]; snprintf (software, len, "%s/system32/config/software", fs->windows_systemroot); char *software_path = resolve_windows_path_silently (g, software); if (!software_path) /* If the software hive doesn't exist, just accept that we cannot * find product_name etc. */ return 0; int ret = -1; hive_h *h = NULL; hive_value_h *values = NULL; if (mkdtemp (dir) == NULL) { perrorf (g, "mkdtemp"); goto out; } snprintf (software_hive, software_hive_len, "%s/software", dir); if (guestfs_download (g, software_path, software_hive) == -1) goto out; h = hivex_open (software_hive, g->verbose ? HIVEX_OPEN_VERBOSE : 0); if (h == NULL) { perrorf (g, "hivex_open"); goto out; } hive_node_h node = hivex_root (h); const char *hivepath[] = { "Microsoft", "Windows NT", "CurrentVersion" }; size_t i; for (i = 0; node != 0 && i < sizeof hivepath / sizeof hivepath[0]; ++i) { node = hivex_node_get_child (h, node, hivepath[i]); } if (node == 0) { perrorf (g, "hivex: cannot locate HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion"); goto out; } values = hivex_node_values (h, node); for (i = 0; values[i] != 0; ++i) { char *key = hivex_value_key (h, values[i]); if (key == NULL) { perrorf (g, "hivex_value_key"); goto out; } if (STRCASEEQ (key, "ProductName")) { fs->product_name = hivex_value_string (h, values[i]); if (!fs->product_name) { perrorf (g, "hivex_value_string"); free (key); goto out; } } else if (STRCASEEQ (key, "CurrentVersion")) { char *version = hivex_value_string (h, values[i]); if (!version) { perrorf (g, "hivex_value_string"); free (key); goto out; } char *major, *minor; if (match2 (g, version, re_windows_version, &major, &minor)) { fs->major_version = parse_unsigned_int (g, major); free (major); if (fs->major_version == -1) { free (minor); free (key); free (version); goto out; } fs->minor_version = parse_unsigned_int (g, minor); free (minor); if (fs->minor_version == -1) { free (key); free (version); return -1; } } free (version); } free (key); } ret = 0; out: if (h) hivex_close (h); free (values); free (software_path); /* Free up the temporary directory. Note the directory name cannot * contain shell meta-characters because of the way it was * constructed above. */ snprintf (cmd, cmd_len, "rm -rf %s", dir); ignore_value (system (cmd)); #undef dir_len #undef software_hive_len #undef cmd_len return ret; } static char * resolve_windows_path_silently (guestfs_h *g, const char *path) { guestfs_error_handler_cb old_error_cb = g->error_cb; g->error_cb = NULL; char *ret = guestfs_case_sensitive_path (g, path); g->error_cb = old_error_cb; return ret; } 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; } /* Parse small, unsigned ints, as used in version numbers. */ static int 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; } static struct inspect_fs * search_for_root (guestfs_h *g, const char *root) { if (g->nr_fses == 0) { error (g, _("no inspection data: call guestfs_inspect_os first")); return NULL; } size_t i; struct inspect_fs *fs; for (i = 0; i < g->nr_fses; ++i) { fs = &g->fses[i]; if (fs->is_root && STREQ (root, fs->device)) return fs; } error (g, _("%s: root device not found: only call this function with a root device previously returned by guestfs_inspect_os"), root); return NULL; } char * guestfs__inspect_get_type (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; char *ret; switch (fs->type) { case OS_TYPE_LINUX: ret = safe_strdup (g, "linux"); break; case OS_TYPE_WINDOWS: ret = safe_strdup (g, "windows"); break; case OS_TYPE_UNKNOWN: default: ret = safe_strdup (g, "unknown"); break; } return ret; } char * guestfs__inspect_get_arch (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; return safe_strdup (g, fs->arch ? : "unknown"); } char * guestfs__inspect_get_distro (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; char *ret; switch (fs->distro) { case OS_DISTRO_ARCHLINUX: ret = safe_strdup (g, "archlinux"); break; case OS_DISTRO_DEBIAN: ret = safe_strdup (g, "debian"); break; case OS_DISTRO_FEDORA: ret = safe_strdup (g, "fedora"); break; case OS_DISTRO_GENTOO: ret = safe_strdup (g, "gentoo"); break; case OS_DISTRO_MEEGO: ret = safe_strdup (g, "meego"); break; case OS_DISTRO_PARDUS: ret = safe_strdup (g, "pardus"); break; case OS_DISTRO_REDHAT_BASED: ret = safe_strdup (g, "redhat-based"); break; case OS_DISTRO_RHEL: ret = safe_strdup (g, "rhel"); break; case OS_DISTRO_WINDOWS: ret = safe_strdup (g, "windows"); break; case OS_DISTRO_UBUNTU: ret = safe_strdup (g, "ubuntu"); break; case OS_DISTRO_UNKNOWN: default: ret = safe_strdup (g, "unknown"); break; } return ret; } int guestfs__inspect_get_major_version (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return -1; return fs->major_version; } int guestfs__inspect_get_minor_version (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return -1; return fs->minor_version; } char * guestfs__inspect_get_product_name (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; return safe_strdup (g, fs->product_name ? : "unknown"); } char * guestfs__inspect_get_windows_systemroot (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; if (!fs->windows_systemroot) { error (g, _("not a Windows guest, or systemroot could not be determined")); return NULL; } return safe_strdup (g, fs->windows_systemroot); } char ** guestfs__inspect_get_mountpoints (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; char **ret; /* If no fstab information (Windows) return just the root. */ if (fs->nr_fstab == 0) { ret = calloc (3, sizeof (char *)); ret[0] = safe_strdup (g, "/"); ret[1] = safe_strdup (g, root); ret[2] = NULL; return ret; } #define CRITERION fs->fstab[i].mountpoint[0] == '/' size_t i, count = 0; for (i = 0; i < fs->nr_fstab; ++i) if (CRITERION) count++; /* Hashtables have 2N+1 entries. */ ret = calloc (2*count+1, sizeof (char *)); if (ret == NULL) { perrorf (g, "calloc"); return NULL; } count = 0; for (i = 0; i < fs->nr_fstab; ++i) if (CRITERION) { ret[2*count] = safe_strdup (g, fs->fstab[i].mountpoint); ret[2*count+1] = safe_strdup (g, fs->fstab[i].device); count++; } #undef CRITERION return ret; } char ** guestfs__inspect_get_filesystems (guestfs_h *g, const char *root) { struct inspect_fs *fs = search_for_root (g, root); if (!fs) return NULL; char **ret; /* If no fstab information (Windows) return just the root. */ if (fs->nr_fstab == 0) { ret = calloc (2, sizeof (char *)); ret[0] = safe_strdup (g, root); ret[1] = NULL; return ret; } ret = calloc (fs->nr_fstab + 1, sizeof (char *)); if (ret == NULL) { perrorf (g, "calloc"); return NULL; } size_t i; for (i = 0; i < fs->nr_fstab; ++i) ret[i] = safe_strdup (g, fs->fstab[i].device); return ret; } /* List filesystems. * * The current implementation just uses guestfs_vfs_type and doesn't * try mounting anything, but we reserve the right in future to try * mounting filesystems. */ static void remove_from_list (char **list, const char *item); static void check_with_vfs_type (guestfs_h *g, const char *dev, char ***ret, size_t *ret_size); char ** guestfs__list_filesystems (guestfs_h *g) { size_t i; char **ret; size_t ret_size; ret = safe_malloc (g, sizeof (char *)); ret[0] = NULL; ret_size = 0; /* Look to see if any devices directly contain filesystems * (RHBZ#590167). However vfs-type will fail to tell us anything * useful about devices which just contain partitions, so we also * get the list of partitions and exclude the corresponding devices * by using part-to-dev. */ char **devices; devices = guestfs_list_devices (g); if (devices == NULL) { free_string_list (ret); return NULL; } char **partitions; partitions = guestfs_list_partitions (g); if (partitions == NULL) { free_string_list (devices); free_string_list (ret); return NULL; } for (i = 0; partitions[i] != NULL; ++i) { char *dev = guestfs_part_to_dev (g, partitions[i]); if (dev) remove_from_list (devices, dev); free (dev); } /* Use vfs-type to check for filesystems on devices. */ for (i = 0; devices[i] != NULL; ++i) check_with_vfs_type (g, devices[i], &ret, &ret_size); free_string_list (devices); /* Use vfs-type to check for filesystems on partitions. */ for (i = 0; partitions[i] != NULL; ++i) check_with_vfs_type (g, partitions[i], &ret, &ret_size); free_string_list (partitions); if (feature_available (g, "lvm2")) { /* Use vfs-type to check for filesystems on LVs. */ char **lvs; lvs = guestfs_lvs (g); if (lvs == NULL) { free_string_list (ret); return NULL; } for (i = 0; lvs[i] != NULL; ++i) check_with_vfs_type (g, lvs[i], &ret, &ret_size); free_string_list (lvs); } return ret; } /* If 'item' occurs in 'list', remove and free it. */ static void remove_from_list (char **list, const char *item) { size_t i; for (i = 0; list[i] != NULL; ++i) if (STREQ (list[i], item)) { free (list[i]); for (; list[i+1] != NULL; ++i) list[i] = list[i+1]; list[i] = NULL; return; } } /* Use vfs-type to look for a filesystem of some sort on 'dev'. * Apart from some types which we ignore, add the result to the * 'ret' string list. */ static void check_with_vfs_type (guestfs_h *g, const char *device, char ***ret, size_t *ret_size) { char *v; 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; if (!vfs_type) v = safe_strdup (g, "unknown"); else { /* Ignore all "*_member" strings. In libblkid these are returned * for things which are members of some RAID or LVM set, most * importantly "LVM2_member" which is a PV. */ size_t n = strlen (vfs_type); if (n >= 7 && STREQ (&vfs_type[n-7], "_member")) { free (vfs_type); return; } /* Ignore LUKS-encrypted partitions. These are also containers. */ if (STREQ (vfs_type, "crypto_LUKS")) { free (vfs_type); return; } v = vfs_type; } /* Extend the return array. */ size_t i = *ret_size; *ret_size += 2; *ret = safe_realloc (g, *ret, (*ret_size + 1) * sizeof (char *)); (*ret)[i] = safe_strdup (g, device); (*ret)[i+1] = v; (*ret)[i+2] = NULL; }