--- /dev/null
+/*
+ * FAM file notification support.
+ *
+ * Copyright (c) James Peach 2005
+ * Copyright (c) Volker Lendecke 2007
+ *
+ * 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 "includes.h"
+#include "smbd/smbd.h"
+#include "librpc/gen_ndr/notify.h"
+
+#include <fam.h>
+
+#if !defined(HAVE_FAM_H_FAMCODES_TYPEDEF)
+/* Gamin provides this typedef which means we can't use 'enum FAMCodes' as per
+ * every other FAM implementation. Phooey.
+ */
+typedef enum FAMCodes FAMCodes;
+#endif
+
+/* NOTE: There are multiple versions of FAM floating around the net, each with
+ * slight differences from the original SGI FAM implementation. In this file,
+ * we rely only on the SGI features and do not assume any extensions. For
+ * example, we do not look at FAMErrno, because it is not set by the original
+ * implementation.
+ *
+ * Random FAM links:
+ * http://oss.sgi.com/projects/fam/
+ * http://savannah.nongnu.org/projects/fam/
+ * http://sourceforge.net/projects/bsdfam/
+ */
+
+/* ------------------------------------------------------------------------- */
+
+struct fam_watch_context {
+ struct fam_watch_context *prev, *next;
+ FAMConnection *fam_connection;
+ struct FAMRequest fr;
+ struct sys_notify_context *sys_ctx;
+ void (*callback)(struct sys_notify_context *ctx,
+ void *private_data,
+ struct notify_event *ev);
+ void *private_data;
+ uint32_t mask; /* the inotify mask */
+ uint32_t filter; /* the windows completion filter */
+ const char *path;
+};
+
+
+/*
+ * We want one FAM connection per smbd, not one per tcon.
+ */
+static FAMConnection fam_connection;
+static bool fam_connection_initialized = False;
+
+static struct fam_watch_context *fam_notify_list;
+static void fam_handler(struct tevent_context *event_ctx,
+ struct tevent_fd *fd_event,
+ uint16_t flags,
+ void *private_data);
+
+static NTSTATUS fam_open_connection(FAMConnection *fam_conn,
+ struct tevent_context *event_ctx)
+{
+ int res;
+ char *name;
+
+ ZERO_STRUCTP(fam_conn);
+ FAMCONNECTION_GETFD(fam_conn) = -1;
+
+
+#ifdef HAVE_FAMNOEXISTS
+ /* We should honor outside setting of the GAM_CLIENT_ID. */
+ setenv("GAM_CLIENT_ID","SAMBA",0);
+#endif
+
+ if (asprintf(&name, "smbd (%lu)", (unsigned long)getpid()) == -1) {
+ DEBUG(0, ("No memory\n"));
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ res = FAMOpen2(fam_conn, name);
+
+#ifdef HAVE_FAMNOEXISTS
+ /*
+ * This reduces the chatter between GAMIN and samba making the pair
+ * much more reliable.
+ */
+ FAMNoExists(fam_conn);
+#endif
+
+ SAFE_FREE(name);
+
+ if (res < 0) {
+ DEBUG(10, ("FAM file change notifications not available: %s\n",
+ FamErrlist[-res]));
+ /*
+ * No idea how to get NT_STATUS from a FAM result
+ */
+ FAMCONNECTION_GETFD(fam_conn) = -1;
+ return NT_STATUS_UNEXPECTED_IO_ERROR;
+ }
+
+ if (tevent_add_fd(event_ctx, event_ctx,
+ FAMCONNECTION_GETFD(fam_conn),
+ TEVENT_FD_READ, fam_handler,
+ (void *)fam_conn) == NULL) {
+ DEBUG(0, ("event_add_fd failed\n"));
+ FAMClose(fam_conn);
+ FAMCONNECTION_GETFD(fam_conn) = -1;
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ return NT_STATUS_OK;
+}
+
+static void fam_reopen(FAMConnection *fam_conn,
+ struct tevent_context *event_ctx,
+ struct fam_watch_context *notify_list)
+{
+ struct fam_watch_context *ctx;
+
+ DEBUG(5, ("Re-opening FAM connection\n"));
+
+ FAMClose(fam_conn);
+
+ if (!NT_STATUS_IS_OK(fam_open_connection(fam_conn, event_ctx))) {
+ DEBUG(5, ("Re-opening fam connection failed\n"));
+ return;
+ }
+
+ for (ctx = notify_list; ctx; ctx = ctx->next) {
+ FAMMonitorDirectory(fam_conn, ctx->path, &ctx->fr, NULL);
+ }
+}
+
+static void fam_handler(struct tevent_context *event_ctx,
+ struct tevent_fd *fd_event,
+ uint16_t flags,
+ void *private_data)
+{
+ FAMConnection *fam_conn = (FAMConnection *)private_data;
+ FAMEvent fam_event;
+ struct fam_watch_context *ctx;
+ struct notify_event ne;
+
+ if (FAMPending(fam_conn) == 0) {
+ DEBUG(10, ("fam_handler called but nothing pending\n"));
+ return;
+ }
+
+ if (FAMNextEvent(fam_conn, &fam_event) != 1) {
+ DEBUG(5, ("FAMNextEvent returned an error\n"));
+ TALLOC_FREE(fd_event);
+ fam_reopen(fam_conn, event_ctx, fam_notify_list);
+ return;
+ }
+
+ DEBUG(10, ("Got FAMCode %d for %s\n", fam_event.code,
+ fam_event.filename));
+
+ switch (fam_event.code) {
+ case FAMChanged:
+ ne.action = NOTIFY_ACTION_MODIFIED;
+ break;
+ case FAMCreated:
+ ne.action = NOTIFY_ACTION_ADDED;
+ break;
+ case FAMDeleted:
+ ne.action = NOTIFY_ACTION_REMOVED;
+ break;
+ default:
+ DEBUG(10, ("Ignoring code FAMCode %d for file %s\n",
+ (int)fam_event.code, fam_event.filename));
+ return;
+ }
+
+ for (ctx = fam_notify_list; ctx; ctx = ctx->next) {
+ if (memcmp(&fam_event.fr, &ctx->fr, sizeof(FAMRequest)) == 0) {
+ break;
+ }
+ }
+
+ if (ctx == NULL) {
+ DEBUG(5, ("Discarding event for file %s\n",
+ fam_event.filename));
+ return;
+ }
+
+ if ((ne.path = strrchr_m(fam_event.filename, '\\')) == NULL) {
+ ne.path = fam_event.filename;
+ }
+ ne.dir = ctx->path;
+
+ ctx->callback(ctx->sys_ctx, ctx->private_data, &ne);
+}
+
+static int fam_watch_context_destructor(struct fam_watch_context *ctx)
+{
+ if (FAMCONNECTION_GETFD(ctx->fam_connection) != -1) {
+ FAMCancelMonitor(&fam_connection, &ctx->fr);
+ }
+ DLIST_REMOVE(fam_notify_list, ctx);
+ return 0;
+}
+
+/*
+ add a watch. The watch is removed when the caller calls
+ talloc_free() on *handle
+*/
+int _fam_watch(TALLOC_CTX *mem_ctx,
+ struct sys_notify_context *ctx,
+ const char *path,
+ uint32_t *filter,
+ uint32_t *subdir_filter,
+ void (*callback)(struct sys_notify_context *ctx,
+ void *private_data,
+ struct notify_event *ev),
+ void *private_data,
+ void *handle_p)
+{
+ const uint32_t fam_mask = (FILE_NOTIFY_CHANGE_FILE_NAME|
+ FILE_NOTIFY_CHANGE_DIR_NAME);
+ struct fam_watch_context *watch;
+ void **handle = (void **)handle_p;
+
+ *handle = NULL;
+
+ if ((*filter & fam_mask) == 0) {
+ DEBUG(10, ("filter = %u, ignoring in FAM\n", *filter));
+ return 0;
+ }
+
+ if (!fam_connection_initialized) {
+ if (!NT_STATUS_IS_OK(fam_open_connection(&fam_connection,
+ ctx->ev))) {
+ /*
+ * Just let smbd do all the work itself
+ */
+ return 0;
+ }
+ fam_connection_initialized = True;
+ }
+
+ if (!(watch = talloc(mem_ctx, struct fam_watch_context))) {
+ return ENOMEM;
+ }
+
+ watch->fam_connection = &fam_connection;
+
+ watch->callback = callback;
+ watch->private_data = private_data;
+ watch->sys_ctx = ctx;
+
+ watch->path = talloc_strdup(watch, path);
+ if (watch->path == NULL) {
+ DEBUG(0, ("talloc_asprintf failed\n"));
+ TALLOC_FREE(watch);
+ return ENOMEM;
+ }
+
+ /*
+ * The FAM module in this early state will only take care of
+ * FAMCreated and FAMDeleted events, Leave the rest to notifyd
+ */
+
+ watch->filter = fam_mask;
+ *filter &= ~fam_mask;
+
+ DLIST_ADD(fam_notify_list, watch);
+ talloc_set_destructor(watch, fam_watch_context_destructor);
+
+ /*
+ * Only directories monitored so far
+ */
+
+ if (FAMCONNECTION_GETFD(watch->fam_connection) != -1) {
+ FAMMonitorDirectory(watch->fam_connection, watch->path,
+ &watch->fr, NULL);
+ }
+ else {
+ /*
+ * If the re-open is successful, this will establish the
+ * FAMMonitor from the list
+ */
+ fam_reopen(watch->fam_connection, ctx->ev, fam_notify_list);
+ }
+
+ *handle = watch;
+
+ return 0;
+}
git.samba.org / samba.git / commitdiff