From 9d57968b6b0e4ef1096c4a45feac8483ef505cea Mon Sep 17 00:00:00 2001 From: "Richard W.M. Jones" Date: Sat, 22 Nov 2014 10:06:10 +0000 Subject: [PATCH] Initial commit. --- .gitignore | 30 +++ COPYING | 339 ++++++++++++++++++++++++++++++++ Makefile.am | 41 ++++ README | 6 + cleanups.c | 67 +++++++ cleanups.h | 51 +++++ configure.ac | 121 ++++++++++++ examiner.c | 627 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ranges.cpp | 79 ++++++++ ranges.h | 35 ++++ run.in | 34 ++++ virt-bmap.in | 113 +++++++++++ visit.c | 210 ++++++++++++++++++++ visit.h | 36 ++++ 14 files changed, 1789 insertions(+) create mode 100644 .gitignore create mode 100644 COPYING create mode 100644 Makefile.am create mode 100644 README create mode 100644 cleanups.c create mode 100644 cleanups.h create mode 100644 configure.ac create mode 100644 examiner.c create mode 100644 ranges.cpp create mode 100644 ranges.h create mode 100644 run.in create mode 100644 virt-bmap.in create mode 100644 visit.c create mode 100644 visit.h diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..af4a0bf --- /dev/null +++ b/.gitignore @@ -0,0 +1,30 @@ +*~ +*.la +*.lo +*.o + +/local* + +/.deps/ +/.gdb_history +/.libs/ +/Makefile +/Makefile.in +/aclocal.m4 +/autom4te.cache/ +/compile +/config.guess +/config.h +/config.h.in +/config.log +/config.status +/config.sub +/configure +/depcomp +/libtool +/ltmain.sh +/install-sh +/missing +/run +/stamp-h1 +/virt-bmap diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/COPYING @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..b957c0d --- /dev/null +++ b/Makefile.am @@ -0,0 +1,41 @@ +# virt-bmap +# Copyright (C) 2014 Red Hat Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +CLEANFILES = *~ + +bin_SCRIPTS = virt-bmap + +lib_LTLIBRARIES = \ + virtbmapexaminer.la +virtbmapexaminer_la_CPPFLAGS = \ + -I$(srcdir) +virtbmapexaminer_la_CFLAGS = \ + -Wall \ + -pthread \ + $(GUESTFS_CFLAGS) +virtbmapexaminer_la_LIBADD = \ + $(GUESTFS_LIBS) +virtbmapexaminer_la_LDFLAGS = \ + -module -avoid-version -shared +virtbmapexaminer_la_SOURCES = \ + cleanups.c \ + cleanups.h \ + examiner.c \ + ranges.cpp \ + ranges.h \ + visit.c \ + visit.h diff --git a/README b/README new file mode 100644 index 0000000..1dbbd97 --- /dev/null +++ b/README @@ -0,0 +1,6 @@ +Virt-bmap constructs a mapping of disk block -> file for a disk image. +It requires libguestfs >= 1.29.10, nbdkit >= 1.1, Boost, and pod2man. +`configure' will check the requirements. + +Discussion, patches, etc. on the virt-tools mailing list: +http://www.redhat.com/mailman/listinfo/virt-tools-list \ No newline at end of file diff --git a/cleanups.c b/cleanups.c new file mode 100644 index 0000000..89c3dc0 --- /dev/null +++ b/cleanups.c @@ -0,0 +1,67 @@ +/* cleanup functions (from libguestfs) + * Copyright (C) 2010-2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include + +#include +#include + +#include + +void +cleanup_free (void *ptr) +{ + free (* (void **) ptr); +} + +void +free_string_list (char **argv) +{ + size_t i; + + if (argv == NULL) + return; + + for (i = 0; argv[i] != NULL; ++i) + free (argv[i]); + free (argv); +} + +void +cleanup_free_string_list (char ***ptr) +{ + free_string_list (*ptr); +} + +void +cleanup_free_statns (void *ptr) +{ + guestfs_free_statns (* (struct guestfs_statns **) ptr); +} + +void +cleanup_free_xattr_list (void *ptr) +{ + guestfs_free_xattr_list (* (struct guestfs_xattr_list **) ptr); +} + +void +cleanup_free_stat_list (void *ptr) +{ + guestfs_free_stat_list (* (struct guestfs_stat_list **) ptr); +} diff --git a/cleanups.h b/cleanups.h new file mode 100644 index 0000000..e185fea --- /dev/null +++ b/cleanups.h @@ -0,0 +1,51 @@ +/* cleanup functions (from libguestfs) + * Copyright (C) 2010-2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include + +#ifndef CLEANUPS_H +#define CLEANUPS_H + +#ifdef HAVE_ATTRIBUTE_CLEANUP + +#define CLEANUP_FREE __attribute__((cleanup(cleanup_free))) +#define CLEANUP_FREE_STRING_LIST \ + __attribute__((cleanup(cleanup_free_string_list))) +#define CLEANUP_FREE_STATNS \ + __attribute__((cleanup(cleanup_free_statns))) +#define CLEANUP_FREE_XATTR_LIST \ + __attribute__((cleanup(cleanup_free_xattr_list))) +#define CLEANUP_FREE_STAT_LIST \ + __attribute__((cleanup(cleanup_free_stat_list))) + +#else +#define CLEANUP_FREE +#define CLEANUP_FREE_STRING_LIST +#define CLEANUP_FREE_STATNS +#define CLEANUP_FREE_XATTR_LIST +#define CLEANUP_FREE_STAT_LIST +#endif + +extern void cleanup_free (void *ptr); +extern void free_string_list (char **argv); +extern void cleanup_free_string_list (char ***ptr); +extern void cleanup_free_statns (void *ptr); +extern void cleanup_free_xattr_list (void *ptr); +extern void cleanup_free_stat_list (void *ptr); + +#endif /* CLEANUPS_H */ diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..5ae490e --- /dev/null +++ b/configure.ac @@ -0,0 +1,121 @@ +# virt-bmap +# Copyright (C) 2014 Red Hat Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +AC_INIT([virt-bmap],[0.1]) +AM_INIT_AUTOMAKE([foreign]) + +dnl Check for basic C environment. +AC_PROG_CC_STDC +AM_PROG_CC_C_O +AC_PROG_CPP + +AC_C_PROTOTYPES +test "x$U" != "x" && AC_MSG_ERROR([Compiler not ANSI compliant]) + +dnl C++ environment. +AC_PROG_CXX +AC_PROG_CXX_C_O + +AC_PROG_INSTALL + +dnl Define GNU_SOURCE etc. +AC_USE_SYSTEM_EXTENSIONS + +dnl Need libtool for creating the shared library. +AC_PROG_LIBTOOL + +dnl Check if __attribute__((cleanup(...))) works. +dnl XXX It would be nice to use AC_COMPILE_IFELSE here, but gcc just +dnl emits a warning for attributes that it doesn't understand. +AC_MSG_CHECKING([if __attribute__((cleanup(...))) works with this compiler]) +AC_RUN_IFELSE([ +AC_LANG_SOURCE([[ +#include +#include + +void +freep (void *ptr) +{ + exit (EXIT_SUCCESS); +} + +void +test (void) +{ + __attribute__((cleanup(freep))) char *ptr = malloc (100); +} + +int +main (int argc, char *argv[]) +{ + test (); + exit (EXIT_FAILURE); +} +]]) + ],[ + AC_MSG_RESULT([yes]) + AC_DEFINE([HAVE_ATTRIBUTE_CLEANUP],[1],[Define to 1 if '__attribute__((cleanup(...)))' works with this compiler.]) + ],[ + AC_MSG_WARN( +['__attribute__((cleanup(...)))' does not work. + +You may not be using a sufficiently recent version of GCC or CLANG, or +you may be using a C compiler which does not support this attribute, +or the configure test may be wrong. + +The code will still compile, but is likely to leak memory and other +resources when it runs.])]) + +dnl Check new enough libguestfs. +PKG_CHECK_MODULES([GUESTFS], [libguestfs >= 1.28]) + +dnl We need some new APIs which were added specifically for virt-bmap: +AC_CHECK_LIB([guestfs], [guestfs_blockdev_setra], [], [ + AC_MSG_ERROR([you need libguestfs >= 1.29.10 which has `guestfs_blockdev_setra']) +]) +AC_CHECK_LIB([guestfs], [guestfs_bmap], [], [ + AC_MSG_ERROR([you need libguestfs >= 1.29.10 which has `guestfs_bmap']) +]) + +dnl Check nbdkit is installed. +AC_CHECK_PROG([NBDKIT], [nbdkit], [nbdkit], [no]) +if test "$NBDKIT" = "xno"; then + AC_MSG_ERROR([nbdkit was not found]) +fi +AC_CHECK_HEADER([nbdkit-plugin.h],[],[ + AC_MSG_ERROR([you need to install the nbdkit development package]) +]) + +dnl Check for C++ boost library with interval_map.hpp +AC_LANG_PUSH([C++]) +AC_CHECK_HEADERS([boost/icl/interval_map.hpp], [], + [AC_MSG_ERROR(You need the Boost libraries.)]) +AC_LANG_POP([C++]) + +dnl Check for pod2man (from Perl, for the manual). +AC_CHECK_PROG([POD2MAN], [pod2man], [pod2man], [no]) +if test "x$POD2MAN" = "xno"; then + AC_MSG_ERROR([pod2man was not found. This is needed to build man pages.]) +fi + +dnl Produce output files. +AC_CONFIG_HEADERS([config.h]) +AC_CONFIG_FILES([Makefile]) +AC_CONFIG_FILES([run], [chmod +x,-w run]) +AC_CONFIG_FILES([virt-bmap], [chmod +x,-w virt-bmap]) + +AC_OUTPUT diff --git a/examiner.c b/examiner.c new file mode 100644 index 0000000..7915f47 --- /dev/null +++ b/examiner.c @@ -0,0 +1,627 @@ +/* virt-bmap examiner plugin + * Copyright (C) 2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* This is an nbdkit plugin which implements the guts of the 'virt-bmap' + * command. + * + * IMPORTANT NOTES: + * + * Do not try to use this plugin directly! Use the 'virt-bmap' + * wrapper script which sets up the arguments correctly and calls + * nbdkit. + * + * This is a bit of a weird nbdkit plugin, because it calls itself. + * Do not use it as an example of how to write plugins! See the + * nbdkit 'example*.c' files supplied in the nbdkit source, and also + * read the nbdkit-plugin(3) documentation. + */ + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +#include + +#include "cleanups.h" +#include "ranges.h" +#include "visit.h" + +static char *output = NULL; +static char *disk = NULL; +static const char *socket = NULL; +static const char *format = "raw"; +static int fd = -1; +static int64_t size = -1; +static int thread_running = 0; +static pthread_t thread; + +static struct thread_info { + guestfs_h *g; + int ret; +} thread_info; + +/* Current object being mapped. */ +static pthread_mutex_t current_object_mutex = PTHREAD_MUTEX_INITIALIZER; +static char *current_object = NULL; + +/* Ranges. NB: acquire current_object_mutex before accessing. */ +static void *ranges = NULL; + +static void *start_thread (void *); + +static int +bmap_config (const char *key, const char *value) +{ + if (strcmp (key, "disk") == 0) { + free (disk); + disk = nbdkit_absolute_path (value); + if (disk == NULL) + return -1; + } + else if (strcmp (key, "format") == 0) { + format = value; + } + else if (strcmp (key, "output") == 0) { + free (output); + output = nbdkit_absolute_path (value); + if (output == NULL) + return -1; + } + else if (strcmp (key, "socket") == 0) { + socket = value; + } + else { + nbdkit_error ("unknown parameter '%s'", key); + return -1; + } + + return 0; +} + +static int +bmap_config_complete (void) +{ + struct stat statbuf; + guestfs_h *g; + int err; + + if (!output || !disk || !socket) { + nbdkit_error ("missing parameters: are you using the 'virt-bmap' wrapper?"); + return -1; + } + + ranges = new_ranges (); + + fd = open (disk, O_RDONLY); + if (fd == -1) { + nbdkit_error ("%s: %m", disk); + return -1; + } + + if (fstat (fd, &statbuf) == -1) { + nbdkit_error ("fstat: %m"); + return -1; + } + size = statbuf.st_size; + + /* Open the guestfs handle synchronously so we can print errors. */ + g = guestfs_create (); + if (!g) { + nbdkit_error ("guestfs_create: %m"); + return -1; + } + + /* Start the guestfs thread. */ + memset (&thread_info, 0, sizeof thread_info); + thread_info.g = g; + err = pthread_create (&thread, NULL, start_thread, &thread_info); + if (err != 0) { + nbdkit_error ("cannot start guestfs thread: %s", strerror (err)); + return -1; + } + thread_running = 1; + + return 0; +} + +static void +bmap_unload (void) +{ + int err; + void *retv; + + free_ranges (ranges); + + if (thread_running) { + err = pthread_join (thread, &retv); + if (err != 0) + fprintf (stderr, "cannot join guestfs thread: %s\n", strerror (err)); + if (* (int *) retv != 0) + fprintf (stderr, "ERROR: failed to construct block map, see earlier errors\n"); + /* unfortunately we can't return the correct exit code here XXX */ + } + if (fd >= 0) + close (fd); + free (output); + free (disk); +} + +#define bmap_config_help \ + "output= Output filename (block map)\n" \ + "disk= Input disk filename" \ + "format=raw|qcow2|.. Format of input disk (default: raw)\n" + +/* The per-connection handle. */ +struct bmap_handle { + /* empty */ +}; + +/* Create the per-connection handle. */ +static void * +bmap_open (int readonly) +{ + struct bmap_handle *h; + + if (!readonly) { + nbdkit_error ("handle must be opened readonly"); + return NULL; + } + + h = malloc (sizeof *h); + if (h == NULL) { + nbdkit_error ("malloc: %m"); + return NULL; + } + + return h; +} + +/* Free up the per-connection handle. */ +static void +bmap_close (void *handle) +{ + struct bmap_handle *h = handle; + + free (h); +} + +#define THREAD_MODEL NBDKIT_THREAD_MODEL_SERIALIZE_ALL_REQUESTS + +/* Get the file size. */ +static int64_t +bmap_get_size (void *handle) +{ + return size; +} + +/* Mark the start and end of guestfs bmap operations. This is called + * from the guestfs thread, so we must lock any shared data structures. + */ +static void +mark_start (const char *object) +{ + pthread_mutex_lock (¤t_object_mutex); + free (current_object); + current_object = strdup (object); + if (current_object == NULL) + abort (); + pthread_mutex_unlock (¤t_object_mutex); +} + +static void +mark_end (void) +{ + pthread_mutex_lock (¤t_object_mutex); + free (current_object); + current_object = NULL; + pthread_mutex_unlock (¤t_object_mutex); +} + +static void +add_range (uint64_t offset, uint32_t count) +{ + pthread_mutex_lock (¤t_object_mutex); + if (current_object) + insert_range (ranges, offset, offset+count, current_object); + pthread_mutex_unlock (¤t_object_mutex); +} + +/* Read data from the file. */ +static int +bmap_pread (void *handle, void *buf, uint32_t count, uint64_t offset) +{ + ssize_t r; + + add_range (offset, count); + + if (lseek (fd, offset, SEEK_SET) == -1) { + nbdkit_error ("lseek: %m"); + return -1; + } + + while (count > 0) { + r = read (fd, buf, count); + if (r == -1) { + nbdkit_error ("read: %m"); + return -1; + } + if (r == 0) { + nbdkit_error ("read: unexpected end of file"); + return -1; + } + count -= r; + buf += r; + } + + return 0; +} + +/* This is the guestfs thread which calls back into nbdkit. */ + +static int count_partitions = 0; +static int count_lvs = 0; +static int count_filesystems = 0; +static int count_regular = 0; +static int count_directory = 0; + +static int examine_partitions (guestfs_h *g); +static int examine_lvs (guestfs_h *g); +static int examine_filesystems (guestfs_h *g); +static int examine_filesystem (guestfs_h *g, const char *dev, const char *type); +static int visit_fn (const char *dir, const char *name, const struct guestfs_statns *stat, const struct guestfs_xattr_list *xattrs, void *opaque); +static int ranges_to_output (void); + +static void * +start_thread (void *infov) +{ + struct thread_info *info = infov; + guestfs_h *g = info->g; + size_t i; + CLEANUP_FREE char *server = NULL; + const char *servers[2]; + + info->ret = -1; + + /* Wait for the socket to appear, ie. for nbdkit to start up. */ + for (i = 0; i < 10; ++i) { + if (access (socket, R_OK) == 0) + goto nbdkit_started; + sleep (1); + } + + fprintf (stderr, "timed out waiting for nbdkit server to start up\n"); + goto error; + + nbdkit_started: + if (asprintf (&server, "unix:%s", socket) == -1) { + perror ("asprintf"); + goto error; + } + + servers[0] = server; + servers[1] = NULL; + + if (guestfs_add_drive_opts (g, "" /* export name */, + GUESTFS_ADD_DRIVE_OPTS_READONLY, 1, + GUESTFS_ADD_DRIVE_OPTS_FORMAT, format, + GUESTFS_ADD_DRIVE_OPTS_PROTOCOL, "nbd", + GUESTFS_ADD_DRIVE_OPTS_SERVER, servers, + -1) == -1) + goto error; + + if (guestfs_launch (g) == -1) + goto error; + + /* Examine non-filesystem objects. */ + if (examine_partitions (g) == -1) + goto error; + if (examine_lvs (g) == -1) + goto error; + + /* Examine filesystems. */ + if (examine_filesystems (g) == -1) + goto error; + + /* Convert ranges to final output file. */ + printf ("virt-bmap: writing %s\n", output); + if (ranges_to_output () == -1) + goto error; + + /* Print summary. */ + printf ("virt-bmap: successfully examined %d partitions, %d logical volumes,\n" + " %d filesystems, %d directories, %d files\n" + "virt-bmap: output written to %s\n", + count_partitions, count_lvs, + count_filesystems, count_directory, count_regular, + output); + info->ret = 0; + error: + guestfs_close (g); + + /* Kill the nbdkit process so it exits. The nbdkit process is us, + * so we're killing ourself here. + */ + kill (getpid (), SIGTERM); + + return &info->ret; +} + +static int +examine_partitions (guestfs_h *g) +{ + CLEANUP_FREE_STRING_LIST char **parts = NULL; + size_t i; + int r; + + /* Get partitions. */ + parts = guestfs_list_partitions (g); + if (parts == NULL) + return -1; + + for (i = 0; parts[i] != NULL; ++i) { + CLEANUP_FREE char *object = NULL; + + printf ("virt-bmap: examining %s ...\n", parts[i]); + count_partitions++; + + if (asprintf (&object, "p %s", parts[i]) == -1) + return -1; + + if (guestfs_bmap_device (g, parts[i]) == -1) + return -1; + mark_start (object); + r = guestfs_bmap (g); + mark_end (); + if (r == -1) return -1; + } + + return 0; + +} + +static int +examine_lvs (guestfs_h *g) +{ + CLEANUP_FREE_STRING_LIST char **lvs = NULL; + size_t i; + int r; + + /* Get LVs. */ + lvs = guestfs_lvs (g); + if (lvs == NULL) + return -1; + + for (i = 0; lvs[i] != NULL; ++i) { + CLEANUP_FREE char *object = NULL; + + printf ("virt-bmap: examining %s ...\n", lvs[i]); + count_lvs++; + + if (asprintf (&object, "lvm_lv %s", lvs[i]) == -1) + return -1; + + if (guestfs_bmap_device (g, lvs[i]) == -1) + return -1; + mark_start (object); + r = guestfs_bmap (g); + mark_end (); + if (r == -1) return -1; + } + + return 0; +} + +static int +examine_filesystems (guestfs_h *g) +{ + CLEANUP_FREE_STRING_LIST char **filesystems = NULL; + size_t i; + + /* Get the filesystems in the disk image. */ + filesystems = guestfs_list_filesystems (g); + if (filesystems == NULL) + return -1; + + for (i = 0; filesystems[i] != NULL; i += 2) { + if (examine_filesystem (g, filesystems[i], filesystems[i+1]) == -1) + return -1; + } + + return 0; +} + +static size_t +count_strings (char *const *argv) +{ + size_t r; + + for (r = 0; argv[r]; ++r) + ; + + return r; +} + +struct visit_context { + guestfs_h *g; + const char *dev; /* filesystem */ + size_t nr_files; /* used for progress bar */ + size_t files_processed; +}; + +static int +examine_filesystem (guestfs_h *g, const char *dev, const char *type) +{ + int r; + + /* Try to mount it. */ + guestfs_push_error_handler (g, NULL, NULL); + r = guestfs_mount_ro (g, dev, "/"); + guestfs_pop_error_handler (g); + if (r == 0) { + struct visit_context context; + CLEANUP_FREE_STRING_LIST char **files = NULL; + + /* Mountable, so examine the filesystem. */ + printf ("virt-bmap: examining filesystem on %s (%s) ...\n", dev, type); + count_filesystems++; + + /* Read how many files/directories there are so we can estimate + * progress. + */ + files = guestfs_find (g, "/"); + + /* Set filesystem readahead to 0, but ignore error if not possible. */ + guestfs_push_error_handler (g, NULL, NULL); + guestfs_blockdev_setra (g, dev, 0); + guestfs_pop_error_handler (g); + + context.g = g; + context.dev = dev; + context.nr_files = count_strings (files); + context.files_processed = 0; + if (visit (g, "/", visit_fn, &context) == -1) + return -1; + } + + guestfs_umount_all (g); + + return 0; +} + +static int +visit_fn (const char *dir, const char *name, + const struct guestfs_statns *stat, + const struct guestfs_xattr_list *xattrs, + void *contextv) +{ + struct visit_context *context = contextv; + guestfs_h *g = context->g; + char type = '?'; + CLEANUP_FREE char *path = NULL, *object = NULL; + int r; + + context->files_processed++; + if ((context->files_processed & 255) == 0) { + printf ("%zu/%zu (%.1f%%) \r", + context->files_processed, context->nr_files, + 100.0 * context->files_processed / context->nr_files); + fflush (stdout); + } + + path = full_path (dir, name); + if (path == NULL) + return -1; + + if (is_reg (stat->st_mode)) + type = 'f'; + else if (is_dir (stat->st_mode)) + type = 'd'; + + /* Note that the object string is structured (space-separated + * fields), and this is copied directly to the output file. + */ + if (asprintf (&object, "%c %s %s", type, context->dev, path) == -1) + return -1; + + if (type == 'f') { /* regular file */ + count_regular++; + bmap_file: + if (guestfs_bmap_file (g, path) == -1) + return -1; + mark_start (object); + r = guestfs_bmap (g); + mark_end (); + if (r == -1) return -1; + } + else if (type == 'd') { /* directory */ + count_directory++; + goto bmap_file; + } + + return 0; +} + +/* Convert ranges to output file format. */ +static void print_range (uint64_t start, uint64_t end, const char *object, void *opaque); + +static int +ranges_to_output (void) +{ + FILE *fp; + + pthread_mutex_lock (¤t_object_mutex); + + /* Write out the ranges to 'output'. */ + fp = fopen (output, "w"); + if (fp == NULL) { + perror (output); + return -1; + } + + iter_range (ranges, print_range, fp); + + fclose (fp); + + pthread_mutex_unlock (¤t_object_mutex); + + return 0; +} + +static void +print_range (uint64_t start, uint64_t end, const char *object, void *opaque) +{ + FILE *fp = opaque; + + /* Note that the initial '1' is meant to signify the first disk. + * Currently we can only map a single disk, but in future we + * should be able to handle multiple disks. + */ + fprintf (fp, "1 %" PRIx64 " %" PRIx64 " %s\n", start, end, object); +} + +/* Register the nbdkit plugin. */ + +static struct nbdkit_plugin plugin = { + .name = "virtbmap", + .version = PACKAGE_VERSION, + .config = bmap_config, + .config_help = bmap_config_help, + .config_complete = bmap_config_complete, + .open = bmap_open, + .close = bmap_close, + .get_size = bmap_get_size, + .pread = bmap_pread, + .unload = bmap_unload, +}; + +NBDKIT_REGISTER_PLUGIN(plugin) diff --git a/ranges.cpp b/ranges.cpp new file mode 100644 index 0000000..f8f173c --- /dev/null +++ b/ranges.cpp @@ -0,0 +1,79 @@ +/* virt-bmap examiner plugin + * Copyright (C) 2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; 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 + +using namespace std; + +/* Maps intervals (uint64_t, uint64_t) to a set of strings, where each + * string represents an object that covers that range. + */ +typedef set objects; +typedef boost::icl::interval_map ranges; + +extern "C" void * +new_ranges (void) +{ + return new ranges (); +} + +extern "C" void +free_ranges (void *mapv) +{ + ranges *map = (ranges *) mapv; + delete map; +} + +extern "C" void +insert_range (void *mapv, uint64_t start, uint64_t end, const char *object) +{ + ranges *map = (ranges *) mapv; + objects obj_set; + obj_set.insert (object); + map->add (make_pair (boost::icl::interval::right_open (start, end), + obj_set)); +} + +extern "C" void +iter_range (void *mapv, void (*f) (uint64_t start, uint64_t end, const char *object, void *opaque), void *opaque) +{ + ranges *map = (ranges *) mapv; + ranges::iterator iter = map->begin (); + while (iter != map->end ()) { + boost::icl::interval::type range = iter->first; + uint64_t start = range.lower (); + uint64_t end = range.upper (); + + objects obj_set = iter->second; + objects::iterator iter2 = obj_set.begin (); + while (iter2 != obj_set.end ()) { + f (start, end, iter2->c_str (), opaque); + iter2++; + } + iter++; + } +} diff --git a/ranges.h b/ranges.h new file mode 100644 index 0000000..c02e05c --- /dev/null +++ b/ranges.h @@ -0,0 +1,35 @@ +/* virt-bmap examiner plugin + * Copyright (C) 2010-2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef RANGES_H +#define RANGES_H + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + +extern void *new_ranges (void); +extern void free_ranges (void *mapv); +extern void insert_range (void *mapv, uint64_t start, uint64_t end, const char *object); +extern void iter_range (void *mapv, void (*f) (uint64_t start, uint64_t end, const char *object, void *opaque), void *opaque); + +#ifdef __cplusplus +}; +#endif /* __cplusplus */ + +#endif /* RANGES_H */ diff --git a/run.in b/run.in new file mode 100644 index 0000000..64ab06f --- /dev/null +++ b/run.in @@ -0,0 +1,34 @@ +#!/bin/bash - +# virt-bmap +# Copyright (C) 2014 Red Hat Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +# Set environment variables so you can run virt-bmap without installing it. + +unset CDPATH + +# Source and build directories (absolute paths so this works from any +# directory). +s="$(cd @abs_srcdir@ && pwd)" +b="$(cd @abs_builddir@ && pwd)" + +# Set PATH. +export PATH=$b:$PATH + +# Set path to plugin. +export VIRTBMAP_PLUGIN_DIR=$b/.libs + +exec "$@" diff --git a/virt-bmap.in b/virt-bmap.in new file mode 100644 index 0000000..1891d44 --- /dev/null +++ b/virt-bmap.in @@ -0,0 +1,113 @@ +#!/bin/bash - +# virt-bmap +# Copyright (C) 2014 Red Hat Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program 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 General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +# 'virt-bmap' is a shell script wrapper that runs nbdkit with the +# right options. Read virt-bmap(1) before trying to use this program. +# +# If you want to run this without installing then use the './run' +# script in the build directory, eg: +# +# ./run virt-bmap -o bmap disk.img + +program=virt-bmap +version="@PACKAGE_VERSION@" + +output=bmap +format=raw + +TEMP=`getopt \ + -o f:o:V \ + --long help,format:,output:,version \ + -n $program -- "$@"` +if [ $? != 0 ]; then + echo "$program: problem parsing the command line arguments" + exit 1 +fi +eval set -- "$TEMP" + +usage () +{ + echo "Usage:" + echo " $program [-o bmap] [--format raw|qcow2|...] disk.img" + echo + echo "Read $program(1) man page for more information." + exit $1 +} + +while true; do + case "$1" in + -f|--format) + format="$2" + shift 2;; + -o|--output) + output="$2" + shift 2;; + -V|--version) + echo "$program $version" + exit 0;; + --help) + usage 0;; + --) + shift + break;; + *) + echo "internal error ($1)" + exit 1;; + esac +done + +# At the moment we only support a single disk image argument. +# Supporting multiple disk images requires adding support for export +# names to nbdkit. +if [ $# -ne 1 ]; then + echo "$program: Missing disk image argument. See $program(1)." + exit 1 +fi + +# Turn the disk image arguments into disk=... +declare -a disks +for arg in "$@"; do + disks+=("disk=$arg") +done + +# Deal with stupid autotools libdir-not-expandable crap. +prefix="@prefix@" +exec_prefix="@exec_prefix@" +libdir="@libdir@" + +# Get the examiner plugin. +if [ -z "$VIRTBMAP_PLUGIN_DIR" ]; then + VIRTBMAP_PLUGIN_DIR="$libdir" +fi + +# Create the socket. +tmpdir="$(mktemp -d)" +cleanup () +{ + rm -rf "$tmpdir" ||: +} +trap cleanup EXIT ERR +socket="$tmpdir/socket" + +# Run nbdkit with plugin and arguments. +nbdkit -r -f -U "$socket" \ + "$VIRTBMAP_PLUGIN_DIR/virtbmapexaminer.so" \ + output="$output" \ + format="$format" \ + socket="$socket" \ + "${disks[@]}" diff --git a/visit.c b/visit.c new file mode 100644 index 0000000..82e810d --- /dev/null +++ b/visit.c @@ -0,0 +1,210 @@ +/* virt-ls visitor function (from libguestfs) + * Copyright (C) 2010-2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +/* Adapted from +https://rwmj.wordpress.com/2010/12/15/tip-audit-virtual-machine-for-setuid-files/ +*/ + +#include + +#include +#include +#include +#include +#include +#include + +#include + +#include "cleanups.h" +#include "visit.h" + +static int _visit (guestfs_h *g, int depth, const char *dir, visitor_function f, void *opaque); + +int +visit (guestfs_h *g, const char *dir, visitor_function f, void *opaque) +{ + return _visit (g, 0, dir, f, opaque); +} + +static int +_visit (guestfs_h *g, int depth, const char *dir, + visitor_function f, void *opaque) +{ + /* Call 'f' with the top directory. Note that ordinary recursive + * visits will not otherwise do this, so we have to have a special + * case. + */ + if (depth == 0) { + CLEANUP_FREE_STATNS struct guestfs_statns *stat = NULL; + CLEANUP_FREE_XATTR_LIST struct guestfs_xattr_list *xattrs = NULL; + int r; + + stat = guestfs_lstatns (g, dir); + if (stat == NULL) + return -1; + + xattrs = guestfs_lgetxattrs (g, dir); + if (xattrs == NULL) + return -1; + + r = f (dir, NULL, stat, xattrs, opaque); + + if (r == -1) + return -1; + } + + size_t i, xattrp; + CLEANUP_FREE_STRING_LIST char **names = NULL; + CLEANUP_FREE_STAT_LIST struct guestfs_statns_list *stats = NULL; + CLEANUP_FREE_XATTR_LIST struct guestfs_xattr_list *xattrs = NULL; + + names = guestfs_ls (g, dir); + if (names == NULL) + return -1; + + stats = guestfs_lstatnslist (g, dir, names); + if (stats == NULL) + return -1; + + xattrs = guestfs_lxattrlist (g, dir, names); + if (xattrs == NULL) + return -1; + + /* Call function on everything in this directory. */ + for (i = 0, xattrp = 0; names[i] != NULL; ++i, ++xattrp) { + CLEANUP_FREE char *path = NULL; + struct guestfs_xattr_list file_xattrs; + size_t nr_xattrs; + + assert (stats->len >= i); + assert (xattrs->len >= xattrp); + + /* Find the list of extended attributes for this file. */ + assert (strlen (xattrs->val[xattrp].attrname) == 0); + + if (xattrs->val[xattrp].attrval_len == 0) { + fprintf (stderr, "virt-bmap: error getting extended attrs for %s %s\n", + dir, names[i]); + return -1; + } + /* attrval is not \0-terminated. */ + char attrval[xattrs->val[xattrp].attrval_len+1]; + memcpy (attrval, xattrs->val[xattrp].attrval, + xattrs->val[xattrp].attrval_len); + attrval[xattrs->val[xattrp].attrval_len] = '\0'; + if (sscanf (attrval, "%zu", &nr_xattrs) != 1) { + fprintf (stderr, "virt-bmap: error: cannot parse xattr count for %s %s\n", + dir, names[i]); + return -1; + } + + file_xattrs.len = nr_xattrs; + file_xattrs.val = &xattrs->val[xattrp+1]; + xattrp += nr_xattrs; + + /* Call the function. */ + if (f (dir, names[i], &stats->val[i], &file_xattrs, opaque) == -1) + return -1; + + /* Recursively call visit, but only on directories. */ + if (is_dir (stats->val[i].st_mode)) { + path = full_path (dir, names[i]); + if (path == NULL) + return -1; + if (_visit (g, depth + 1, path, f, opaque) == -1) + return -1; + } + } + + return 0; +} + +char * +full_path (const char *dir, const char *name) +{ + int r; + char *path; + int len; + + len = strlen (dir); + if (len > 0 && dir[len - 1] == '/') + --len; + + if (strcmp (dir, "/") == 0) + r = asprintf (&path, "/%s", name ? name : ""); + else if (name) + r = asprintf (&path, "%.*s/%s", len, dir, name); + else + r = asprintf (&path, "%.*s", len, dir); + + if (r == -1) { + perror ("asprintf"); + return NULL; + } + + return path; +} + +/* In the libguestfs API, modes returned by lstat and friends are + * defined to contain Linux ABI values. However since the "current + * operating system" might not be Linux, we have to hard-code those + * numbers here. + */ +int +is_reg (int64_t mode) +{ + return (mode & 0170000) == 0100000; +} + +int +is_dir (int64_t mode) +{ + return (mode & 0170000) == 0040000; +} + +int +is_chr (int64_t mode) +{ + return (mode & 0170000) == 0020000; +} + +int +is_blk (int64_t mode) +{ + return (mode & 0170000) == 0060000; +} + +int +is_fifo (int64_t mode) +{ + return (mode & 0170000) == 0010000; +} + +/* symbolic link */ +int +is_lnk (int64_t mode) +{ + return (mode & 0170000) == 0120000; +} + +int +is_sock (int64_t mode) +{ + return (mode & 0170000) == 0140000; +} diff --git a/visit.h b/visit.h new file mode 100644 index 0000000..a64b42e --- /dev/null +++ b/visit.h @@ -0,0 +1,36 @@ +/* virt-ls visitor function + * Copyright (C) 2010-2014 Red Hat Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#ifndef VISIT_H +#define VISIT_H + +typedef int (*visitor_function) (const char *dir, const char *name, const struct guestfs_statns *stat, const struct guestfs_xattr_list *xattrs, void *opaque); + +extern int visit (guestfs_h *g, const char *dir, visitor_function f, void *opaque); + +extern char *full_path (const char *dir, const char *name); + +extern int is_reg (int64_t mode); +extern int is_dir (int64_t mode); +extern int is_chr (int64_t mode); +extern int is_blk (int64_t mode); +extern int is_fifo (int64_t mode); +extern int is_lnk (int64_t mode); +extern int is_sock (int64_t mode); + +#endif /* VISIT_H */ -- 1.8.3.1