--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ Copyright (C) Andrew Tridgell 2006
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/*
+ this is the change notify database. It implements mechanisms for
+ storing current change notify waiters in a tdb, and checking if a
+ given event matches any of the stored notify waiiters.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+#include "lib/tdb/include/tdb.h"
+#include "lib/tdb/include/tdbutil.h"
+#include "messaging/messaging.h"
+#include "db_wrap.h"
+#include "smb_server/smb_server.h"
+#include "lib/messaging/irpc.h"
+#include "librpc/gen_ndr/ndr_notify.h"
+#include "dlinklist.h"
+
+struct notify_context {
+ struct tdb_wrap *w;
+ uint32_t server;
+ struct messaging_context *messaging_ctx;
+ struct notify_list *list;
+ struct notify_array *array;
+};
+
+
+struct notify_list {
+ struct notify_list *next, *prev;
+ void *private;
+ void (*callback)(void *, const struct notify_event *);
+};
+
+#define NOTIFY_KEY "notify array"
+
+static NTSTATUS notify_remove_all(struct notify_context *notify);
+static void notify_handler(struct messaging_context *msg_ctx, void *private,
+ uint32_t msg_type, uint32_t server_id, DATA_BLOB *data);
+
+/*
+ destroy the notify context
+*/
+static int notify_destructor(void *p)
+{
+ struct notify_context *notify = talloc_get_type(p, struct notify_context);
+ messaging_deregister(notify->messaging_ctx, MSG_PVFS_NOTIFY, notify);
+ notify_remove_all(notify);
+ return 0;
+}
+
+/*
+ Open up the notify.tdb database. You should close it down using
+ talloc_free(). We need the messaging_ctx to allow for notifications
+ via internal messages
+*/
+struct notify_context *notify_init(TALLOC_CTX *mem_ctx, uint32_t server,
+ struct messaging_context *messaging_ctx)
+{
+ char *path;
+ struct notify_context *notify;
+
+ notify = talloc(mem_ctx, struct notify_context);
+ if (notify == NULL) {
+ return NULL;
+ }
+
+ path = smbd_tmp_path(notify, "notify.tdb");
+ notify->w = tdb_wrap_open(notify, path, 0,
+ TDB_DEFAULT,
+ O_RDWR|O_CREAT, 0600);
+ talloc_free(path);
+ if (notify->w == NULL) {
+ talloc_free(notify);
+ return NULL;
+ }
+
+ notify->server = server;
+ notify->messaging_ctx = messaging_ctx;
+ notify->list = NULL;
+ notify->array = NULL;
+
+ talloc_set_destructor(notify, notify_destructor);
+
+ /* register with the messaging subsystem for the notify
+ message type */
+ messaging_register(notify->messaging_ctx, notify,
+ MSG_PVFS_NOTIFY, notify_handler);
+
+ return notify;
+}
+
+/*
+ load the notify array
+*/
+static NTSTATUS notify_load(struct notify_context *notify)
+{
+ TDB_DATA dbuf;
+ DATA_BLOB blob;
+ NTSTATUS status;
+
+ talloc_free(notify->array);
+ notify->array = talloc_zero(notify, struct notify_array);
+ NT_STATUS_HAVE_NO_MEMORY(notify->array);
+
+ dbuf = tdb_fetch_bystring(notify->w->tdb, NOTIFY_KEY);
+ if (dbuf.dptr == NULL) {
+ return NT_STATUS_OK;
+ }
+
+ blob.data = dbuf.dptr;
+ blob.length = dbuf.dsize;
+
+ status = ndr_pull_struct_blob(&blob, notify->array, notify->array,
+ (ndr_pull_flags_fn_t)ndr_pull_notify_array);
+ free(dbuf.dptr);
+
+ return status;
+}
+
+
+/*
+ save the notify array
+*/
+static NTSTATUS notify_save(struct notify_context *notify)
+{
+ TDB_DATA dbuf;
+ DATA_BLOB blob;
+ NTSTATUS status;
+ int ret;
+ TALLOC_CTX *tmp_ctx;
+
+ if (notify->array->num_entries == 0) {
+ ret = tdb_delete_bystring(notify->w->tdb, NOTIFY_KEY);
+ if (ret != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+ return NT_STATUS_OK;
+ }
+
+ tmp_ctx = talloc_new(notify);
+
+ status = ndr_push_struct_blob(&blob, tmp_ctx, notify->array,
+ (ndr_push_flags_fn_t)ndr_push_notify_array);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return status;
+ }
+
+ dbuf.dptr = blob.data;
+ dbuf.dsize = blob.length;
+
+ ret = tdb_store_bystring(notify->w->tdb, NOTIFY_KEY, dbuf, TDB_REPLACE);
+ talloc_free(tmp_ctx);
+ if (ret != 0) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ return NT_STATUS_OK;
+}
+
+
+/*
+ handle incoming notify messages
+*/
+static void notify_handler(struct messaging_context *msg_ctx, void *private,
+ uint32_t msg_type, uint32_t server_id, DATA_BLOB *data)
+{
+ struct notify_context *notify = talloc_get_type(private, struct notify_context);
+ NTSTATUS status;
+ struct notify_event ev;
+ TALLOC_CTX *tmp_ctx = talloc_new(notify);
+ struct notify_list *listel;
+
+ status = ndr_pull_struct_blob(data, tmp_ctx, &ev,
+ (ndr_pull_flags_fn_t)ndr_pull_notify_event);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ for (listel=notify->list;listel;listel=listel->next) {
+ if (listel->private == ev.private) {
+ listel->callback(listel->private, &ev);
+ break;
+ }
+ }
+
+ talloc_free(tmp_ctx);
+}
+
+/*
+ add a notify watch. This is called when a notify is first setup on a open
+ directory handle.
+*/
+NTSTATUS notify_add(struct notify_context *notify, struct notify_entry *e,
+ void (*callback)(void *, const struct notify_event *),
+ void *private)
+{
+ NTSTATUS status;
+ struct notify_list *listel;
+
+ status = notify_load(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ notify->array->entries = talloc_realloc(notify->array, notify->array->entries,
+ struct notify_entry,
+ notify->array->num_entries+1);
+
+ if (notify->array->entries == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ notify->array->entries[notify->array->num_entries] = *e;
+ notify->array->entries[notify->array->num_entries].private = private;
+ notify->array->entries[notify->array->num_entries].server = notify->server;
+ notify->array->num_entries++;
+
+ status = notify_save(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ listel = talloc(notify, struct notify_list);
+ NT_STATUS_HAVE_NO_MEMORY(listel);
+
+ listel->private = private;
+ listel->callback = callback;
+ DLIST_ADD(notify->list, listel);
+
+ return status;
+}
+
+/*
+ remove a notify watch. Called when the directory handle is closed
+*/
+NTSTATUS notify_remove(struct notify_context *notify, void *private)
+{
+ NTSTATUS status;
+ struct notify_list *listel;
+ int i;
+
+ for (listel=notify->list;listel;listel=listel->next) {
+ if (listel->private == private) {
+ DLIST_REMOVE(notify->list, listel);
+ break;
+ }
+ }
+ if (listel == NULL) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ status = notify_load(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ for (i=0;i<notify->array->num_entries;i++) {
+ if (notify->server == notify->array->entries[i].server &&
+ private == notify->array->entries[i].private) {
+ break;
+ }
+ }
+ if (i == notify->array->num_entries) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ if (i < notify->array->num_entries-1) {
+ memmove(¬ify->array->entries[i], ¬ify->array->entries[i+1],
+ sizeof(notify->array->entries[i])*(notify->array->num_entries-(i+1)));
+ }
+ notify->array->num_entries--;
+
+ return notify_save(notify);
+}
+
+/*
+ remove all notify watches for this messaging server
+*/
+static NTSTATUS notify_remove_all(struct notify_context *notify)
+{
+ NTSTATUS status;
+ int i;
+
+ if (notify->list == NULL) {
+ return NT_STATUS_OK;
+ }
+
+ status = notify_load(notify);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ for (i=0;i<notify->array->num_entries;i++) {
+ if (notify->server == notify->array->entries[i].server) {
+ if (i < notify->array->num_entries-1) {
+ memmove(¬ify->array->entries[i], ¬ify->array->entries[i+1],
+ sizeof(notify->array->entries[i])*(notify->array->num_entries-(i+1)));
+ }
+ i--;
+ notify->array->num_entries--;
+ }
+ }
+
+
+ return notify_save(notify);
+}
+
+
+/*
+ see if a notify event matches
+*/
+static BOOL notify_match(struct notify_context *notify, struct notify_entry *e,
+ const char *path, uint32_t action)
+{
+ size_t len = strlen(e->path);
+
+ /* TODO: check action */
+
+ if (strncmp(path, e->path, len) != 0) {
+ return False;
+ }
+
+ if (path[len] == 0) {
+ return True;
+ }
+ if (path[len] != '/') {
+ return False;
+ }
+
+ if (!e->recursive) {
+ if (strchr(&path[len+1], '/') != NULL) {
+ return False;
+ }
+ }
+
+ return True;
+}
+
+
+/*
+ send a notify message to another messaging server
+*/
+static void notify_send(struct notify_context *notify, struct notify_entry *e,
+ const char *path, uint32_t action)
+{
+ struct notify_event ev;
+ DATA_BLOB data;
+ NTSTATUS status;
+ TALLOC_CTX *tmp_ctx;
+
+ ev.action = action;
+ ev.path = path;
+ ev.private = e->private;
+
+ tmp_ctx = talloc_new(notify);
+
+ status = ndr_push_struct_blob(&data, tmp_ctx, &ev,
+ (ndr_push_flags_fn_t)ndr_push_notify_event);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ status = messaging_send(notify->messaging_ctx, e->server,
+ MSG_PVFS_NOTIFY, &data);
+ talloc_free(tmp_ctx);
+}
+
+/*
+ trigger a notify message for anyone waiting on a matching event
+*/
+void notify_trigger(struct notify_context *notify,
+ uint32_t action, const char *path)
+{
+ NTSTATUS status;
+ int i;
+
+ status = notify_load(notify);
+ if (!NT_STATUS_IS_OK(status)) {
+ return;
+ }
+
+ /* this needs to be changed to a log(n) search */
+ for (i=0;i<notify->array->num_entries;i++) {
+ if (notify_match(notify, ¬ify->array->entries[i], path, action)) {
+ notify_send(notify, ¬ify->array->entries[i], path, action);
+ }
+ }
+}
--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+
+ POSIX NTVFS backend - notify
+
+ Copyright (C) Andrew Tridgell 2006
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "vfs_posix.h"
+#include "lib/messaging/irpc.h"
+#include "messaging/messaging.h"
+
+/* pending notifies buffer, hung off struct pvfs_file for open directories
+ that have used change notify */
+struct pvfs_notify_buffer {
+ struct pvfs_file *f;
+ uint32_t num_changes;
+ struct notify_changes *changes;
+ uint32_t max_buffer_size;
+ uint32_t current_buffer_size;
+ void *wait_handle;
+};
+
+
+/*
+ destroy a notify buffer. Called when the handle is closed
+ */
+static int pvfs_notify_destructor(void *ptr)
+{
+ struct pvfs_notify_buffer *n = talloc_get_type(ptr, struct pvfs_notify_buffer);
+ notify_remove(n->f->pvfs->notify_context, n);
+ n->f->notify_buffer = NULL;
+ return 0;
+}
+
+
+/*
+ called when a async notify event comes in
+*/
+static void pvfs_notify_callback(void *private, const struct notify_event *ev)
+{
+ struct pvfs_notify_buffer *n = talloc_get_type(private, struct pvfs_notify_buffer);
+ DEBUG(0,("got notify for '%s'\n", ev->path));
+}
+
+/*
+ setup a notify buffer on a directory handle
+*/
+static NTSTATUS pvfs_notify_setup(struct pvfs_state *pvfs, struct pvfs_file *f,
+ uint32_t buffer_size, uint32_t filter, BOOL recursive)
+{
+ NTSTATUS status;
+ struct notify_entry e;
+
+ f->notify_buffer = talloc_zero(f, struct pvfs_notify_buffer);
+ NT_STATUS_HAVE_NO_MEMORY(f->notify_buffer);
+
+ f->notify_buffer->max_buffer_size = buffer_size;
+ f->notify_buffer->f = f;
+
+ e.filter = filter;
+ e.path = f->handle->name->full_name;
+ e.recursive = recursive;
+
+ status = notify_add(pvfs->notify_context, &e,
+ pvfs_notify_callback, f->notify_buffer);
+ NT_STATUS_NOT_OK_RETURN(status);
+
+ talloc_set_destructor(f->notify_buffer, pvfs_notify_destructor);
+
+ return NT_STATUS_OK;
+}
+
+
+/* change notify request - always async. This request blocks until the
+ event buffer is non-empty */
+NTSTATUS pvfs_notify(struct ntvfs_module_context *ntvfs,
+ struct ntvfs_request *req,
+ struct smb_notify *info)
+{
+ struct pvfs_state *pvfs = talloc_get_type(ntvfs->private_data,
+ struct pvfs_state);
+ struct pvfs_file *f;
+ NTSTATUS status;
+
+ f = pvfs_find_fd(pvfs, req, info->in.file.fnum);
+ if (!f) {
+ return NT_STATUS_INVALID_HANDLE;
+ }
+
+ /* this request doesn't make sense unless its async */
+ if (!(req->async_states->state & NTVFS_ASYNC_STATE_MAY_ASYNC)) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /* its only valid for directories */
+ if (f->handle->fd != -1) {
+ return NT_STATUS_NOT_A_DIRECTORY;
+ }
+
+ /* if the handle doesn't currently have a notify buffer then
+ create one */
+ if (f->notify_buffer == NULL) {
+ status = pvfs_notify_setup(pvfs, f,
+ info->in.buffer_size,
+ info->in.completion_filter,
+ info->in.recursive);
+ NT_STATUS_NOT_OK_RETURN(status);
+ }
+
+ /* if the buffer is empty then start waiting */
+ if (f->notify_buffer->num_changes == 0) {
+ req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
+ return NT_STATUS_OK;
+ }
+
+ /* otherwise if the buffer is not empty then return its
+ contents immediately */
+ info->out.num_changes = f->notify_buffer->num_changes;
+ info->out.changes = talloc_steal(req, f->notify_buffer->changes);
+ f->notify_buffer->num_changes = 0;
+ f->notify_buffer->changes = NULL;
+ f->notify_buffer->current_buffer_size = 0;
+
+ return NT_STATUS_OK;
+}
git.samba.org / jra / samba / .git / commitdiff