[Libguestfs] [PATCH 1/2] added filesystem_walk API
Matteo Cafasso
noxdafox at gmail.com
Tue Mar 29 17:42:48 UTC 2016
Signed-off-by: Matteo Cafasso <noxdafox at gmail.com>
---
generator/actions.ml | 13 ++++
src/Makefile.am | 1 +
src/tsk.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 208 insertions(+)
create mode 100644 src/tsk.c
diff --git a/generator/actions.ml b/generator/actions.ml
index e33655a..f795721 100644
--- a/generator/actions.ml
+++ b/generator/actions.ml
@@ -3546,6 +3546,19 @@ 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, 16);
+ style = RStructList ("nodeinfos", "tsk_node"), [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.
+
+For each file or directory found, the function reports its path, its inode and whether
+it is allocated or not." };
+
]
(* 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..551b615
--- /dev/null
+++ b/src/tsk.c
@@ -0,0 +1,194 @@
+/* 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 "full-write.h"
+
+#include "guestfs.h"
+#include "guestfs_protocol.h"
+#include "guestfs-internal.h"
+#include "guestfs-internal-all.h"
+#include "guestfs-internal-actions.h"
+
+#ifdef HAVE_LIBTSK
+
+static int deserialise_inode_info
+(guestfs_h *g, XDR *xdrs, struct guestfs_tsk_node *node_info);
+static size_t read_file(guestfs_h *g, const char *path, char **dest);
+static struct guestfs_tsk_node_list *
+parse_filesystem_walk0 (guestfs_h *g, char *buf, size_t bufsize);
+static void free_nodes(struct guestfs_tsk_node_list *nodes);
+
+struct guestfs_tsk_node_list *
+guestfs_impl_filesystem_walk(guestfs_h *g, const char *mountable)
+{
+ size_t size = 0;
+
+ CLEANUP_FREE char *buf = NULL;
+ CLEANUP_UNLINK_FREE char *tmpfile = NULL;
+
+ if (guestfs_int_lazy_make_tmpdir (g) == -1)
+ return NULL;
+
+ tmpfile = safe_asprintf(g, "%s/filesystem_walk%d", g->tmpdir, ++g->unique);
+
+ if (guestfs_filesystem_walk0(g, mountable, tmpfile) < 0)
+ return NULL;
+
+ if (!(size = read_file(g, tmpfile, &buf)))
+ return NULL;
+
+ return parse_filesystem_walk0(g, buf, size); /* caller frees */
+}
+
+/* Read the whole file at path into dest.
+ * Return the size of the file, 0 on error.
+ */
+static size_t read_file(guestfs_h *g, const char *path, char **dest)
+{
+ int fd = 0;
+ size_t size;
+ struct stat statbuf;
+
+ if ((fd = open(path, O_RDONLY|O_CLOEXEC)) == -1) {
+ perrorf(g, "open: %s", path);
+ return 0;
+ }
+
+ if (fstat(fd, &statbuf) == -1) {
+ perrorf(g, "stat: %s", path);
+ close(fd);
+ return 0;
+ }
+
+ size = statbuf.st_size;
+ if (!(*dest = malloc(size))) {
+ perrorf(g, "malloc: %zu bytes", size);
+ close(fd);
+ return 0;
+ }
+
+ if (full_read(fd, *dest, size) != size) {
+ perrorf(g, "full-read: %s: %zu bytes", path, size);
+ close(fd);
+ return 0;
+ }
+
+ if (close(fd) == -1) {
+ perrorf(g, "close: %s", path);
+ close(fd);
+ return 0;
+ }
+
+ return size;
+}
+
+/* Parse buf content and populate nodes list.
+ * Return a list of tsk_nodes on success, NULL on error.
+ */
+static struct guestfs_tsk_node_list *
+parse_filesystem_walk0 (guestfs_h *g, char *buf, size_t bufsize)
+{
+ XDR xdr;
+ uint32_t index = 0;
+ struct guestfs_tsk_node_list *nodes = NULL;
+
+ nodes = safe_malloc(g, sizeof *nodes);
+ nodes->len = 0;
+ nodes->val = NULL;
+
+ xdrmem_create(&xdr, buf, bufsize, XDR_DECODE);
+
+ for (index = 0; xdr_getpos(&xdr) < bufsize; index++) {
+ if (index == nodes->len) {
+ nodes->len = 2 * (nodes->len + 1);
+ nodes->val = safe_realloc(g, nodes->val,
+ nodes->len * sizeof (struct guestfs_tsk_node));
+ }
+
+ if (deserialise_inode_info(g, &xdr, &nodes->val[index]) < 0)
+ {
+ xdr_destroy(&xdr);
+ free_nodes(nodes);
+
+ return NULL;
+ }
+ }
+
+ xdr_destroy(&xdr);
+
+ nodes->len = index;
+ nodes->val = safe_realloc(g, nodes->val,
+ nodes->len * sizeof (struct guestfs_tsk_node));
+
+ return nodes;
+}
+
+/* Parse a single XDR encoded node_info.
+ * Return 0 on success, -1 on error.
+ */
+static int
+deserialise_inode_info
+(guestfs_h *g, XDR *xdrs, struct guestfs_tsk_node *node_info)
+{
+ size_t len = 0;
+ CLEANUP_FREE char *buf = NULL;
+
+ if (!xdr_u_long(xdrs, &len))
+ return -1;
+
+ buf = safe_malloc(g, len);
+
+ if (!xdr_string(xdrs, &buf, len))
+ return -1;
+ if (!xdr_uint64_t(xdrs, &node_info->tsk_inode))
+ return -1;
+ if (!xdr_uint32_t(xdrs, &node_info->tsk_allocated))
+ return -1;
+
+ node_info->tsk_name = safe_strndup(g, buf, len);
+
+ return 0;
+}
+
+/* Free the nodes list. */
+static void
+free_nodes(struct guestfs_tsk_node_list *nodes)
+{
+ uint32_t index = 0;
+
+ for (index = 0; index < nodes->len; index++)
+ if (nodes->val[index].tsk_name != NULL)
+ free(nodes->val[index].tsk_name);
+
+ free(nodes);
+}
+
+#endif /* !HAVE_LIBTSK */
--
2.8.0.rc3
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