[PATCH 1/2] vfs: add vfs_snapper module
David Disseldorp
ddiss at samba.org
Mon Jun 23 06:58:05 MDT 2014
Provides an interface for accessing snapshots exposed by Snapper. The
module communicates with snapperd on the local machine using the D-Bus
interface.
Signed-off-by: David Disseldorp <ddiss at samba.org>
---
source3/modules/vfs_snapper.c | 843 ++++++++++++++++++++++++++++++++++++++++++
source3/modules/wscript_build | 8 +
source3/wscript | 9 +
3 files changed, 860 insertions(+)
create mode 100644 source3/modules/vfs_snapper.c
diff --git a/source3/modules/vfs_snapper.c b/source3/modules/vfs_snapper.c
new file mode 100644
index 0000000..babb588
--- /dev/null
+++ b/source3/modules/vfs_snapper.c
@@ -0,0 +1,843 @@
+/*
+ * Module for snapshot IO using snapper
+ *
+ * Copyright (C) David Disseldorp 2012-2014
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <dbus/dbus.h>
+#include <linux/ioctl.h>
+#include <sys/ioctl.h>
+#include <dirent.h>
+#include <libgen.h>
+#include "includes.h"
+#include "include/ntioctl.h"
+#include "system/filesys.h"
+#include "smbd/smbd.h"
+#include "lib/util/tevent_ntstatus.h"
+
+#define SNAPPER_SIG_LIST_SNAPS_RSP "a(uquxussa{ss})"
+#define SNAPPER_SIG_LIST_CONFS_RSP "a(ssa{ss})"
+#define SNAPPER_SIG_STRING_DICT "{ss}"
+
+struct snapper_dict {
+ char *key;
+ char *val;
+};
+
+struct snapper_snap {
+ uint32_t id;
+ uint16_t type;
+ uint32_t pre_id;
+ int64_t time;
+ uint32_t creator_uid;
+ char *desc;
+ char *cleanup;
+ uint32_t num_user_data;
+ struct snapper_dict *user_data;
+};
+
+struct snapper_conf {
+ char *name;
+ char *mnt;
+ uint32_t num_attrs;
+ struct snapper_dict *attrs;
+};
+
+static const struct {
+ const char *snapper_err_str;
+ NTSTATUS status;
+} snapper_err_map[] = {
+ { "error.no_permissions", NT_STATUS_ACCESS_DENIED },
+};
+
+static NTSTATUS snapper_err_ntstatus_map(const char *snapper_err_str)
+{
+ int i;
+
+ if (snapper_err_str == NULL) {
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ for (i = 0; i < ARRAY_SIZE(snapper_err_map); i++) {
+ if (!strcmp(snapper_err_map[i].snapper_err_str,
+ snapper_err_str)) {
+ return snapper_err_map[i].status;
+ }
+ }
+ DEBUG(2, ("no explicit mapping for dbus error: %s\n", snapper_err_str));
+
+ return NT_STATUS_UNSUCCESSFUL;
+}
+
+static DBusConnection *snapper_dbus_conn_create(void)
+{
+ DBusError err;
+ DBusConnection *dconn;
+
+ dbus_error_init(&err);
+
+ /*
+ * Always create a new DBus connection, to ensure snapperd detects the
+ * correct client [E]UID. With dbus_bus_get() it does not!
+ */
+ dconn = dbus_bus_get_private(DBUS_BUS_SYSTEM, &err);
+ if (dbus_error_is_set(&err)) {
+ DEBUG(0, ("dbus connection error: %s\n", err.message));
+ dbus_error_free(&err);
+ }
+ if (dconn == NULL) {
+ return NULL;
+ }
+
+ /* dbus_bus_get_private() sets exit-on-disconnect by default, undo it */
+ dbus_connection_set_exit_on_disconnect(dconn, false);
+
+ return dconn;
+}
+
+static void snapper_dbus_conn_destroy(DBusConnection *dconn)
+{
+ if (dconn == NULL) {
+ DEBUG(2, ("attempt to destroy NULL dbus connection\n"));
+ return;
+ }
+
+ dbus_connection_close(dconn);
+ dbus_connection_unref(dconn);
+}
+
+/*
+ * send the message @send_msg over the dbus and wait for a response, return the
+ * responsee via @recv_msg_out.
+ * @send_msg is not freed, dbus_message_unref() must be handled by the caller.
+ */
+static NTSTATUS snapper_dbus_msg_xchng(DBusConnection *dconn,
+ DBusMessage *send_msg,
+ DBusMessage **recv_msg_out)
+{
+ DBusPendingCall *pending;
+ DBusMessage *recv_msg;
+
+ /* send message and get a handle for a reply */
+ if (!dbus_connection_send_with_reply(dconn, send_msg, &pending, -1)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ if (NULL == pending) {
+ DEBUG(0, ("dbus msg send failed\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+
+ dbus_connection_flush(dconn);
+
+ /* block until we receive a reply */
+ dbus_pending_call_block(pending);
+
+ /* get the reply message */
+ recv_msg = dbus_pending_call_steal_reply(pending);
+ if (recv_msg == NULL) {
+ DEBUG(0, ("Reply Null\n"));
+ return NT_STATUS_UNSUCCESSFUL;
+ }
+ /* free the pending message handle */
+ dbus_pending_call_unref(pending);
+ *recv_msg_out = recv_msg;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_type_check(DBusMessageIter *iter,
+ int expected_type)
+{
+ int type = dbus_message_iter_get_arg_type(iter);
+ if (type != expected_type) {
+ DEBUG(0, ("got type %d, expecting %d\n",
+ type, expected_type));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_type_check_get(DBusMessageIter *iter,
+ int expected_type,
+ void *val)
+{
+ NTSTATUS status;
+ status = snapper_type_check(iter, expected_type);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_get_basic(iter, val);
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_dict_unpack(DBusMessageIter *iter,
+ struct snapper_dict *dict_out)
+
+{
+ NTSTATUS status;
+ DBusMessageIter dct_iter;
+
+ status = snapper_type_check(iter, DBUS_TYPE_DICT_ENTRY);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &dct_iter);
+
+ status = snapper_type_check_get(&dct_iter, DBUS_TYPE_STRING,
+ &dict_out->key);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&dct_iter);
+ status = snapper_type_check_get(&dct_iter, DBUS_TYPE_STRING,
+ &dict_out->val);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ return NT_STATUS_OK;
+}
+
+static void snapper_dict_array_print(uint32_t num_dicts,
+ struct snapper_dict *dicts)
+{
+ int i;
+
+ for (i = 0; i < num_dicts; i++) {
+ DEBUG(10, ("dict (key: %s, val: %s)\n",
+ dicts[i].key, dicts[i].val));
+ }
+}
+
+static NTSTATUS snapper_dict_array_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessageIter *iter,
+ uint32_t *num_dicts_out,
+ struct snapper_dict **dicts_out)
+{
+ NTSTATUS status;
+ DBusMessageIter array_iter;
+ uint32_t num_dicts;
+ struct snapper_dict *dicts = NULL;
+
+ status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &array_iter);
+
+ num_dicts = 0;
+ while (dbus_message_iter_get_arg_type(&array_iter)
+ != DBUS_TYPE_INVALID) {
+ num_dicts++;
+ dicts = talloc_realloc(mem_ctx, dicts, struct snapper_dict,
+ num_dicts);
+ if (dicts == NULL)
+ abort();
+
+ status = snapper_dict_unpack(&array_iter,
+ &dicts[num_dicts - 1]);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(dicts);
+ return status;
+ }
+ dbus_message_iter_next(&array_iter);
+ }
+
+ *num_dicts_out = num_dicts;
+ *dicts_out = dicts;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_list_confs_pack(DBusMessage **req_msg_out)
+{
+ DBusMessage *msg;
+
+ msg = dbus_message_new_method_call("org.opensuse.Snapper",
+ "/org/opensuse/Snapper",
+ "org.opensuse.Snapper",
+ "ListConfigs");
+ if (msg == NULL) {
+ DEBUG(0, ("null msg\n"));
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* no arguments to append */
+ *req_msg_out = msg;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_conf_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessageIter *iter,
+ struct snapper_conf *conf_out)
+{
+ NTSTATUS status;
+ DBusMessageIter st_iter;
+
+ status = snapper_type_check(iter, DBUS_TYPE_STRUCT);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &st_iter);
+
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
+ &conf_out->name);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
+ &conf_out->mnt);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_dict_array_unpack(mem_ctx, &st_iter,
+ &conf_out->num_attrs,
+ &conf_out->attrs);
+
+ return status;
+}
+
+static void snapper_conf_array_free(int32_t num_confs,
+ struct snapper_conf *confs)
+{
+ int i;
+
+ for (i = 0; i < num_confs; i++) {
+ talloc_free(confs[i].attrs);
+ }
+ talloc_free(confs);
+}
+
+static struct snapper_conf *snapper_conf_array_base_find(int32_t num_confs,
+ struct snapper_conf *confs,
+ const char *base)
+{
+ int i;
+
+ for (i = 0; i < num_confs; i++) {
+ if (strcmp(confs[i].mnt, base) == 0) {
+ DEBUG(5, ("found snapper conf %s for path %s\n",
+ confs[i].name, base));
+ return &confs[i];
+ }
+ }
+ DEBUG(5, ("config for base %s not found\n", base));
+
+ return NULL;
+}
+
+static void snapper_conf_array_print(int32_t num_confs,
+ struct snapper_conf *confs)
+{
+ int i;
+
+ for (i = 0; i < num_confs; i++) {
+ DEBUG(10, ("name: %s, mnt: %s\n",
+ confs[i].name, confs[i].mnt));
+ snapper_dict_array_print(confs[i].num_attrs, confs[i].attrs);
+ }
+}
+
+static NTSTATUS snapper_conf_array_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessageIter *iter,
+ uint32_t *num_confs_out,
+ struct snapper_conf **confs_out)
+{
+ uint32_t num_confs;
+ NTSTATUS status;
+ struct snapper_conf *confs = NULL;
+ DBusMessageIter array_iter;
+
+
+ status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &array_iter);
+
+ num_confs = 0;
+ while (dbus_message_iter_get_arg_type(&array_iter)
+ != DBUS_TYPE_INVALID) {
+ num_confs++;
+ confs = talloc_realloc(mem_ctx, confs, struct snapper_conf,
+ num_confs);
+ if (confs == NULL)
+ abort();
+
+ status = snapper_conf_unpack(mem_ctx, &array_iter,
+ &confs[num_confs - 1]);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(confs);
+ return status;
+ }
+ dbus_message_iter_next(&array_iter);
+ }
+
+ *num_confs_out = num_confs;
+ *confs_out = confs;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_list_confs_unpack(TALLOC_CTX *mem_ctx,
+ DBusConnection *dconn,
+ DBusMessage *rsp_msg,
+ uint32_t *num_confs_out,
+ struct snapper_conf **confs_out)
+{
+ NTSTATUS status;
+ DBusMessageIter iter;
+ int msg_type;
+ uint32_t num_confs;
+ struct snapper_conf *confs;
+ const char *sig;
+
+ msg_type = dbus_message_get_type(rsp_msg);
+ if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
+ const char *err_str = dbus_message_get_error_name(rsp_msg);
+ DEBUG(0, ("list_confs error response: %s\n", err_str));
+ return snapper_err_ntstatus_map(err_str);
+ }
+
+ if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
+ DEBUG(0, ("unexpected list_confs ret type: %d\n",
+ msg_type));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ sig = dbus_message_get_signature(rsp_msg);
+ if ((sig == NULL)
+ || (strcmp(sig, SNAPPER_SIG_LIST_CONFS_RSP) != 0)) {
+ DEBUG(0, ("bad list confs response sig: %s, expected: %s\n",
+ (sig ? sig : "NULL"), SNAPPER_SIG_LIST_CONFS_RSP));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ if (!dbus_message_iter_init(rsp_msg, &iter)) {
+ /* FIXME return empty? */
+ DEBUG(0, ("Message has no arguments!\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ status = snapper_conf_array_unpack(mem_ctx, &iter, &num_confs, &confs);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("failed to unpack conf array\n"));
+ return status;
+ }
+
+ snapper_conf_array_print(num_confs, confs);
+
+ *num_confs_out = num_confs;
+ *confs_out = confs;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_list_snaps_pack(char *snapper_conf,
+ DBusMessage **req_msg_out)
+{
+ DBusMessage *msg;
+ DBusMessageIter args;
+
+ msg = dbus_message_new_method_call("org.opensuse.Snapper", /* target for the method call */
+ "/org/opensuse/Snapper", /* object to call on */
+ "org.opensuse.Snapper", /* interface to call on */
+ "ListSnapshots"); /* method name */
+ if (msg == NULL) {
+ DEBUG(0, ("failed to create list snaps message\n"));
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* append arguments */
+ dbus_message_iter_init_append(msg, &args);
+ if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING,
+ &snapper_conf)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ *req_msg_out = msg;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_snap_struct_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessageIter *iter,
+ struct snapper_snap *snap_out)
+{
+ NTSTATUS status;
+ DBusMessageIter st_iter;
+
+ status = snapper_type_check(iter, DBUS_TYPE_STRUCT);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &st_iter);
+
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
+ &snap_out->id);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT16,
+ &snap_out->type);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
+ &snap_out->pre_id);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_INT64,
+ &snap_out->time);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_UINT32,
+ &snap_out->creator_uid);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
+ &snap_out->desc);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_type_check_get(&st_iter, DBUS_TYPE_STRING,
+ &snap_out->cleanup);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+
+ dbus_message_iter_next(&st_iter);
+ status = snapper_dict_array_unpack(mem_ctx, &st_iter,
+ &snap_out->num_user_data,
+ &snap_out->user_data);
+
+ return status;
+}
+
+static void snapper_snap_array_free(int32_t num_snaps,
+ struct snapper_snap *snaps)
+{
+ int i;
+
+ for (i = 0; i < num_snaps; i++) {
+ talloc_free(snaps[i].user_data);
+ }
+ talloc_free(snaps);
+}
+
+static void snapper_snap_array_print(int32_t num_snaps,
+ struct snapper_snap *snaps)
+{
+ int i;
+
+ for (i = 0; i < num_snaps; i++) {
+ DEBUG(10, ("id: %u, "
+ "type: %u, "
+ "pre_id: %u, "
+ "time: %ld, "
+ "creator_uid: %u, "
+ "desc: %s, "
+ "cleanup: %s\n",
+ (unsigned int)snaps[i].id,
+ (unsigned int)snaps[i].type,
+ (unsigned int)snaps[i].pre_id,
+ (long int)snaps[i].time,
+ (unsigned int)snaps[i].creator_uid,
+ snaps[i].desc,
+ snaps[i].cleanup));
+ snapper_dict_array_print(snaps[i].num_user_data,
+ snaps[i].user_data);
+ }
+}
+
+static NTSTATUS snapper_snap_array_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessageIter *iter,
+ uint32_t *num_snaps_out,
+ struct snapper_snap **snaps_out)
+{
+ uint32_t num_snaps;
+ NTSTATUS status;
+ struct snapper_snap *snaps = NULL;
+ DBusMessageIter array_iter;
+
+
+ status = snapper_type_check(iter, DBUS_TYPE_ARRAY);
+ if (!NT_STATUS_IS_OK(status)) {
+ return status;
+ }
+ dbus_message_iter_recurse(iter, &array_iter);
+
+ num_snaps = 0;
+ while (dbus_message_iter_get_arg_type(&array_iter)
+ != DBUS_TYPE_INVALID) {
+ num_snaps++;
+ snaps = talloc_realloc(mem_ctx, snaps, struct snapper_snap,
+ num_snaps);
+ if (snaps == NULL)
+ abort();
+
+ status = snapper_snap_struct_unpack(mem_ctx, &array_iter,
+ &snaps[num_snaps - 1]);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(snaps);
+ return status;
+ }
+ dbus_message_iter_next(&array_iter);
+ }
+
+ *num_snaps_out = num_snaps;
+ *snaps_out = snaps;
+
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_list_snaps_unpack(TALLOC_CTX *mem_ctx,
+ DBusMessage *rsp_msg,
+ uint32_t *num_snaps_out,
+ struct snapper_snap **snaps_out)
+{
+ NTSTATUS status;
+ DBusMessageIter iter;
+ int msg_type;
+ uint32_t num_snaps;
+ struct snapper_snap *snaps;
+ const char *sig;
+
+ msg_type = dbus_message_get_type(rsp_msg);
+ if (msg_type == DBUS_MESSAGE_TYPE_ERROR) {
+ const char *err_str = dbus_message_get_error_name(rsp_msg);
+ DEBUG(0, ("list_snaps error response: %s\n", err_str));
+ return snapper_err_ntstatus_map(err_str);
+ }
+
+ if (msg_type != DBUS_MESSAGE_TYPE_METHOD_RETURN) {
+ DEBUG(0,("unexpected list_snaps ret type: %d\n",
+ msg_type));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ sig = dbus_message_get_signature(rsp_msg);
+ if ((sig == NULL)
+ || (strcmp(sig, SNAPPER_SIG_LIST_SNAPS_RSP) != 0)) {
+ DEBUG(0, ("bad list snaps response sig: %s, "
+ "expected: %s\n",
+ (sig ? sig : "NULL"),
+ SNAPPER_SIG_LIST_SNAPS_RSP));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* read the parameters */
+ if (!dbus_message_iter_init(rsp_msg, &iter)) {
+ DEBUG(0, ("response has no arguments!\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ status = snapper_snap_array_unpack(mem_ctx, &iter, &num_snaps, &snaps);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("failed to unpack snap array\n"));
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ snapper_snap_array_print(num_snaps, snaps);
+
+ *num_snaps_out = num_snaps;
+ *snaps_out = snaps;
+
+ return NT_STATUS_OK;
+}
+
+/*
+ * Determine the snapper snapshot id given a path.
+ * Ideally this should be determined via a lookup.
+ */
+static NTSTATUS snapper_snap_path_to_id(TALLOC_CTX *mem_ctx,
+ const char *snap_path,
+ uint32_t *snap_id_out)
+{
+ char *path_dup;
+ char *str_idx;
+ char *str_end;
+ uint32_t snap_id;
+
+ path_dup = talloc_strdup(mem_ctx, snap_path);
+ if (path_dup == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ /* trim trailing '/' */
+ str_idx = path_dup + strlen(path_dup) - 1;
+ while (*str_idx == '/') {
+ *str_idx = '\0';
+ str_idx--;
+ }
+
+ str_idx = strrchr(path_dup, '/');
+ if ((str_idx == NULL)
+ || (strcmp(str_idx + 1, "snapshot") != 0)) {
+ talloc_free(path_dup);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ while (*str_idx == '/') {
+ *str_idx = '\0';
+ str_idx--;
+ }
+
+ str_idx = strrchr(path_dup, '/');
+ if (str_idx == NULL) {
+ talloc_free(path_dup);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ str_idx++;
+ snap_id = strtoul(str_idx, &str_end, 10);
+ if (str_idx == str_end) {
+ talloc_free(path_dup);
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ talloc_free(path_dup);
+ *snap_id_out = snap_id;
+ return NT_STATUS_OK;
+}
+
+/*
+ * Determine the snapper snapshot path given an id and base.
+ * Ideally this should be determined via a lookup.
+ */
+static NTSTATUS snapper_snap_id_to_path(TALLOC_CTX *mem_ctx,
+ const char *base_path,
+ uint32_t snap_id,
+ char **snap_path_out)
+{
+ char *snap_path;
+
+ snap_path = talloc_asprintf(mem_ctx, "%s/.snapshots/%u/snapshot",
+ base_path, snap_id);
+ if (snap_path == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ *snap_path_out = snap_path;
+ return NT_STATUS_OK;
+}
+
+static NTSTATUS snapper_get_conf_call(TALLOC_CTX *mem_ctx,
+ DBusConnection *dconn,
+ const char *path,
+ char **conf_name_out,
+ char **base_path_out)
+{
+ NTSTATUS status;
+ DBusMessage *req_msg;
+ DBusMessage *rsp_msg;
+ uint32_t num_confs = 0;
+ struct snapper_conf *confs = NULL;
+ struct snapper_conf *conf;
+ char *conf_name;
+ char *base_path;
+
+ status = snapper_list_confs_pack(&req_msg);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto err_out;
+ }
+
+ status = snapper_dbus_msg_xchng(dconn, req_msg, &rsp_msg);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto err_req_free;
+ }
+
+ status = snapper_list_confs_unpack(mem_ctx, dconn, rsp_msg,
+ &num_confs, &confs);
+ if (!NT_STATUS_IS_OK(status)) {
+ goto err_rsp_free;
+ }
+
+ /*
+ * for now we only support shares where the path directly corresponds
+ * to a snapper configuration.
+ */
+ conf = snapper_conf_array_base_find(num_confs, confs,
+ path);
+ if (conf == NULL) {
+ status = NT_STATUS_NOT_SUPPORTED;
+ goto err_array_free;
+ }
+
+ conf_name = talloc_strdup(mem_ctx, conf->name);
+ if (conf_name == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto err_array_free;
+ }
+ base_path = talloc_strdup(mem_ctx, conf->mnt);
+ if (base_path == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto err_conf_name_free;
+ }
+
+ snapper_conf_array_free(num_confs, confs);
+ dbus_message_unref(rsp_msg);
+ dbus_message_unref(req_msg);
+
+ *conf_name_out = conf_name;
+ *base_path_out = base_path;
+
+ return NT_STATUS_OK;
+
+err_conf_name_free:
+ talloc_free(conf_name);
+err_array_free:
+ snapper_conf_array_free(num_confs, confs);
+err_rsp_free:
+ dbus_message_unref(rsp_msg);
+err_req_free:
+ dbus_message_unref(req_msg);
+err_out:
+ return status;
+}
+
+static struct vfs_fn_pointers snapper_fns = {
+};
+
+NTSTATUS vfs_snapper_init(void);
+NTSTATUS vfs_snapper_init(void)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
+ "snapper", &snapper_fns);
+}
diff --git a/source3/modules/wscript_build b/source3/modules/wscript_build
index 2d5cc6d..57daebe 100644
--- a/source3/modules/wscript_build
+++ b/source3/modules/wscript_build
@@ -489,3 +489,11 @@ bld.SAMBA3_MODULE('vfs_worm',
init_function='',
internal_module=bld.SAMBA3_IS_STATIC_MODULE('vfs_worm'),
enabled=bld.SAMBA3_IS_ENABLED_MODULE('vfs_worm'))
+
+bld.SAMBA3_MODULE('vfs_snapper',
+ subsystem='vfs',
+ source='vfs_snapper.c',
+ deps='samba-util dbus-1',
+ init_function='',
+ internal_module=bld.SAMBA3_IS_STATIC_MODULE('vfs_snapper'),
+ enabled=bld.SAMBA3_IS_ENABLED_MODULE('vfs_snapper'))
diff --git a/source3/wscript b/source3/wscript
index 6e76c86..6bf2d3b 100644
--- a/source3/wscript
+++ b/source3/wscript
@@ -1784,6 +1784,12 @@ main() {
conf.SET_TARGET_TYPE('gfapi', 'EMPTY')
conf.undefine('HAVE_GLUSTERFS')
+ if conf.check_cfg(package='dbus-1', args='--cflags --libs',
+ msg='Checking for dbus', uselib_store="DBUS-1"):
+ if (conf.CHECK_HEADERS('dbus/dbus.h', lib='dbus-1')
+ and conf.CHECK_LIB('dbus-1', shlib=True)):
+ conf.DEFINE('HAVE_DBUS', '1')
+
conf.env.build_regedit = False
if not Options.options.with_regedit == False:
conf.PROCESS_SEPARATE_RULE('system_ncurses')
@@ -1887,6 +1893,9 @@ main() {
if conf.CONFIG_SET('HAVE_GLUSTERFS'):
default_shared_modules.extend(TO_LIST('vfs_glusterfs'))
+ if conf.CONFIG_SET('HAVE_DBUS'):
+ default_shared_modules.extend(TO_LIST('vfs_snapper'))
+
explicit_shared_modules = TO_LIST(Options.options.shared_modules, delimiter=',')
explicit_static_modules = TO_LIST(Options.options.static_modules, delimiter=',')
--
1.8.4.5
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