/* 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 #include #include #include #include #include #include #include #include #include #ifdef HAVE_ENDIAN_H #include #endif #include #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" /* 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_diskbyid; static pcre *re_netbsd; static pcre *re_opensuse; static pcre *re_sles; static pcre *re_nld; static pcre *re_opensuse_version; static pcre *re_sles_version; static pcre *re_sles_patchlevel; 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_diskbyid, "^/dev/disk/by-id/.*-part(\\d+)$", 0); COMPILE (re_netbsd, "^NetBSD (\\d+)\\.(\\d+)", 0); COMPILE (re_opensuse, "^(openSUSE|SuSE Linux|SUSE LINUX) ", 0); COMPILE (re_sles, "^SUSE (Linux|LINUX) Enterprise ", 0); COMPILE (re_nld, "^Novell Linux Desktop ", 0); COMPILE (re_opensuse_version, "^VERSION = (\\d+)\\.(\\d+)", 0); COMPILE (re_sles_version, "^VERSION = (\\d+)", 0); COMPILE (re_sles_patchlevel, "^PATCHLEVEL = (\\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_diskbyid); pcre_free (re_netbsd); pcre_free (re_opensuse); pcre_free (re_sles); pcre_free (re_nld); pcre_free (re_opensuse_version); pcre_free (re_sles_version); pcre_free (re_sles_patchlevel); } 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 *)); static int is_partition (guestfs_h *g, const char *partition); /* 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; } static int parse_suse_release (guestfs_h *g, struct inspect_fs *fs, const char *filename) { int64_t size; char *major, *minor; char **lines; int r = -1; /* 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; /* First line is dist release name */ fs->product_name = safe_strdup (g, lines[0]); if (fs->product_name == NULL) goto out; /* Match SLES first because openSuSE regex overlaps some SLES release strings */ if (match (g, fs->product_name, re_sles) || match (g, fs->product_name, re_nld)) { fs->distro = OS_DISTRO_SLES; /* Second line contains version string */ if (lines[1] == NULL) goto out; major = match1 (g, lines[1], re_sles_version); fs->major_version = guestfs___parse_unsigned_int (g, major); free (major); if (fs->major_version == -1) goto out; /* Third line contains service pack string */ if (lines[2] == NULL) goto out; minor = match1 (g, lines[2], re_sles_patchlevel); fs->minor_version = guestfs___parse_unsigned_int (g, minor); free (minor); if (fs->minor_version == -1) goto out; } else if (match (g, fs->product_name, re_opensuse)) { fs->distro = OS_DISTRO_OPENSUSE; /* Second line contains version string */ if (lines[1] == NULL) goto out; if (match2 (g, lines[1], re_opensuse_version, &major, &minor)) { fs->major_version = guestfs___parse_unsigned_int (g, major); fs->minor_version = guestfs___parse_unsigned_int (g, minor); free (major); free (minor); if (fs->major_version == -1 || fs->minor_version == -1) goto out; } } r = 0; out: guestfs___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. */ 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_SUSE_BASED; if (parse_suse_release (g, fs, "/etc/SuSE-release") == -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 STREQ (a->mdadm, b->mdadm); } 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 **m = matches; *m != NULL; m++) { /* Get device name and uuid for each array */ char *dev_path = safe_asprintf(g, "%s/devicename", *m); char *dev = guestfs_aug_get(g, dev_path); free(dev_path); if (!dev) goto error; char *uuid_path = safe_asprintf(g, "%s/uuid", *m); 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; } static int resolve_fstab_device_xdev (guestfs_h *g, const char *type, const char *disk, const char *part, char **device_ret) { char *name, *device; char **devices; size_t i, count; struct drive *drv; const char *p; /* type: (h|s|v|xv) * disk: ([a-z]+) * part: (\d*) */ devices = guestfs_list_devices (g); if (devices == NULL) return -1; /* Check any hints we were passed for a non-heuristic mapping */ name = safe_asprintf (g, "%sd%s", type, disk); ITER_DRIVES (g, i, drv) { if (drv->name && STREQ (drv->name, name)) { device = safe_asprintf (g, "%s%s", devices[i], part); if (!is_partition (g, device)) { free (device); goto out; } *device_ret = device; break; } } free (name); /* Guess the appliance device name if we didn't find a matching hint */ if (!*device_ret) { /* Count how many disks the libguestfs appliance has */ for (count = 0; devices[count] != NULL; count++) ; /* Calculate the numerical index of the disk */ i = disk[0] - 'a'; for (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); if (!is_partition (g, device)) { free (device); goto out; } *device_ret = device; } } out: guestfs___free_string_list (devices); return 0; } static int resolve_fstab_device_cciss (guestfs_h *g, const char *disk, const char *part, char **device_ret) { char *device; char **devices; size_t i; struct drive *drv; /* disk: (cciss/c\d+d\d+) * part: (\d+)? */ devices = guestfs_list_devices (g); if (devices == NULL) return -1; /* Check any hints we were passed for a non-heuristic mapping */ ITER_DRIVES (g, i, drv) { if (drv->name && STREQ (drv->name, disk)) { if (part) { device = safe_asprintf (g, "%s%s", devices[i], part); if (!is_partition (g, device)) { free (device); goto out; } *device_ret = device; } else *device_ret = safe_strdup (g, devices[i]); break; } } /* We don't try to guess mappings for cciss devices */ out: guestfs___free_string_list (devices); return 0; } static int resolve_fstab_device_diskbyid (guestfs_h *g, const char *part, char **device_ret) { int nr_devices; char *device; /* For /dev/disk/by-id there is a limit to what we can do because * original SCSI ID information has likely been lost. This * heuristic will only work for guests that have a single block * device. * * So the main task here is to make sure the assumptions above are * true. * * XXX Use hints from virt-p2v if available. * See also: https://bugzilla.redhat.com/show_bug.cgi?id=836573#c3 */ nr_devices = guestfs_nr_devices (g); if (nr_devices == -1) return -1; /* If #devices isn't 1, give up trying to translate this fstab entry. */ if (nr_devices != 1) return 0; /* Make the partition name and check it exists. */ device = safe_asprintf (g, "/dev/sda%s", part); if (!is_partition (g, device)) { free (device); return 0; } *device_ret = device; 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, Hash_table *md_map) { char *device = NULL; char *type, *slice, *disk, *part; int r; 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: * * > 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 (match3 (g, spec, re_xdev, &type, &disk, &part)) { r = resolve_fstab_device_xdev (g, type, disk, part, &device); free (type); free (disk); free (part); if (r == -1) return NULL; } else if (match2 (g, spec, re_cciss, &disk, &part)) { r = resolve_fstab_device_cciss (g, disk, part, &device); free (disk); free (part); if (r == -1) return NULL; } 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); } } else if ((part = match1 (g, spec, re_diskbyid)) != NULL) { r = resolve_fstab_device_diskbyid (g, part, &device); free (part); if (r == -1) return NULL; } /* 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; } static int is_partition (guestfs_h *g, const char *partition) { char *device; guestfs_error_handler_cb old_error_cb; old_error_cb = g->error_cb; g->error_cb = NULL; if ((device = guestfs_part_to_dev (g, partition)) == NULL) { g->error_cb = old_error_cb; return 0; } if (guestfs_device_index (g, device) == -1) { g->error_cb = old_error_cb; free (device); return 0; } g->error_cb = old_error_cb; free (device); return 1; }