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-rw-r--r--source3/lib/serverid.c62
1 files changed, 62 insertions, 0 deletions
diff --git a/source3/lib/serverid.c b/source3/lib/serverid.c
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+/*
+ Unix SMB/CIFS implementation.
+ Implementation of a reliable server_exists()
+ Copyright (C) Volker Lendecke 2010
+
+ 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 "lib/util/server_id.h"
+#include "serverid.h"
+#include "lib/param/param.h"
+#include "ctdbd_conn.h"
+#include "lib/messages_ctdb.h"
+#include "lib/messaging/messages_dgm.h"
+
+static bool serverid_exists_local(const struct server_id *id)
+{
+ bool exists = process_exists_by_pid(id->pid);
+ uint64_t unique;
+ int ret;
+
+ if (!exists) {
+ return false;
+ }
+
+ if (id->unique_id == SERVERID_UNIQUE_ID_NOT_TO_VERIFY) {
+ return true;
+ }
+
+ ret = messaging_dgm_get_unique(id->pid, &unique);
+ if (ret != 0) {
+ return false;
+ }
+
+ return (unique == id->unique_id);
+}
+
+bool serverid_exists(const struct server_id *id)
+{
+ if (procid_is_local(id)) {
+ return serverid_exists_local(id);
+ }
+
+ if (lp_clustering()) {
+ return ctdbd_process_exists(messaging_ctdb_connection(),
+ id->vnn, id->pid, id->unique_id);
+ }
+
+ return false;
+}