Re: [Libguestfs] [PATCH v3 4/5] appliance: Added filesystem_walk command

The filesystem_walk command is the appliance's counterpart of the daemon's internal_filesystem_walk command.

It writes the daemon's command output on a temporary file and parses it, deserialising the XDR formatted tsk_dirent structs. It returns to the caller the list of tsk_dirent structs generated by the internal_filesystem_walk command. Signed-off-by: Matteo Cafasso <noxdafox(a)gmail.com&gt; --- generator/actions.ml | 69 +++++++++++++++++++++++++++++ src/Makefile.am | 1 + src/tsk.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 src/tsk.c diff --git a/generator/actions.ml b/generator/actions.ml index 8073370..afff402 100644 --- a/generator/actions.ml +++ b/generator/actions.ml @@ -3546,6 +3546,75 @@ The environment variable C<XDG_RUNTIME_DIR> controls the default value: If C<XDG_RUNTIME_DIR> is set, then that is the default. Else F</tmp> is the default." }; + { defaults with + name = "filesystem_walk"; added = (1, 33, 18); + style = RStructList ("dirents", "tsk_dirent"), [Mountable "device";], []; + optional = Some "libtsk"; + progress = true; cancellable = true; + shortdesc = "walk through the filesystem content"; + longdesc = "\ +Walk through the internal structures of a disk partition +(eg. F</dev/sda1>) in order to return a list of all the files +and directories stored within. + +It is not necessary to mount the disk partition to run this command. + +All entries in the filesystem are returned, excluding C<.> and +C<..>. This function can list deleted or unaccessible files. +The entries are I<not> sorted. + +If the entry is not allocated (ex: it has been deleted), +its inode, type or size might not be recovered correctly. +In such case, the inode might be 0, the size might be -1 and the type +might be unidentified 'u'.

+This call returns as well basic file type information about each +file. The C<tsk_type> field will contain one of the following characters: + +=over 4 + +=item 'b' + +Block special + +=item 'c' + +Char special + +=item 'd' + +Directory + +=item 'f' + +FIFO (named pipe) + +=item 'l' + +Symbolic link + +=item 'r' + +Regular file + +=item 's' + +Socket + +=item 'h' + +Shadow inode (Solaris) + +=item 'w' + +Whiteout inode (BSD) + +=item 'u' + +Unknown file type + +=back" }; + ] (* daemon_functions are any functions which cause some action diff --git a/src/Makefile.am b/src/Makefile.am index 3b4cd10..9f8af4c 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -130,6 +130,7 @@ libguestfs_la_SOURCES = \ structs-copy.c \ structs-free.c \ tmpdirs.c \ + tsk.c \ whole-file.c \ libguestfs.syms diff --git a/src/tsk.c b/src/tsk.c new file mode 100644 index 0000000..4d7fd7c --- /dev/null +++ b/src/tsk.c @@ -0,0 +1,123 @@ +/* libguestfs + * Copyright (C) 2016 Red Hat Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <string.h> +#include <rpc/xdr.h> +#include <rpc/types.h> + +#include "full-read.h" + +#include "guestfs.h" +#include "guestfs_protocol.h" +#include "guestfs-internal.h" +#include "guestfs-internal-all.h" +#include "guestfs-internal-actions.h" + +static struct guestfs_tsk_dirent_list *parse_filesystem_walk (guestfs_h *, char *, size_t );

+int deserialise_dirent_list (guestfs_h *, char *, size_t , struct guestfs_tsk_dirent_list *);

+ +struct guestfs_tsk_dirent_list * +guestfs_impl_filesystem_walk (guestfs_h *g, const char *mountable) +{ + int ret = 0; + size_t size = 0; + CLEANUP_FREE char *buf = NULL; + CLEANUP_UNLINK_FREE char *tmpfile = NULL; + + ret = guestfs_int_lazy_make_tmpdir (g); + if (ret < 0) + return NULL; + + tmpfile = safe_asprintf (g, "%s/filesystem_walk%d", g->tmpdir, ++g->unique); + + ret = guestfs_internal_filesystem_walk (g, mountable, tmpfile); + if (ret < 0) + return NULL; + + ret = guestfs_int_read_whole_file (g, tmpfile, &buf, &size);

+ if (ret < 0) + return NULL; + + return parse_filesystem_walk (g, buf, size); /* caller frees */ +} + +/* Parse buf content and return dirents list. + * Return a list of tsk_dirent on success, NULL on error. + */ +static struct guestfs_tsk_dirent_list * +parse_filesystem_walk (guestfs_h *g, char *buf, size_t bufsize) +{ + int ret = 0; + struct guestfs_tsk_dirent_list *dirents = NULL; + + /* Initialise results array. */ + dirents = safe_malloc (g, sizeof (*dirents)); + dirents->len = 8; + dirents->val = safe_malloc (g, dirents->len * sizeof (*dirents->val)); + + /* Deserialise buffer into dirent list. */ + ret = deserialise_dirent_list (g, buf, bufsize, dirents); + if (ret < 0) { + guestfs_free_tsk_dirent_list (dirents); + return NULL; + } + + return dirents; +} + +/* Deserialise buf content and populate the dirent list. + * Return the number of deserialised dirents, -1 on error. + */ +int +deserialise_dirent_list (guestfs_h *g, char *buf, size_t bufsize, + struct guestfs_tsk_dirent_list *dirents) +{ + XDR xdr; + bool_t ret = 0; + uint32_t index = 0; + + xdrmem_create (&xdr, buf, bufsize, XDR_DECODE); + + for (index = 0; xdr_getpos (&xdr) < bufsize; index++) { + if (index == dirents->len) { + dirents->len = 2 * dirents->len; + dirents->val = safe_realloc (g, dirents->val, + dirents->len * + sizeof (*dirents->val)); + } + + memset(&dirents->val[index], 0, sizeof (*dirents->val));

+ ret = xdr_guestfs_int_tsk_dirent(&xdr, (guestfs_int_tsk_dirent *)