source/lib/messages_ctdbd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba internal messaging functions
   4    Copyright (C) 2007 by Volker Lendecke
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21
  22 #ifdef CLUSTER_SUPPORT
  23
  24 #include "librpc/gen_ndr/messaging.h"
  25
  26 struct messaging_ctdbd_context {
  27         struct ctdbd_connection *conn;
  28 };
  29
  30 /*
  31  * This is a Samba3 hack/optimization. Routines like process_exists need to
  32  * talk to ctdbd, and they don't get handed a messaging context.
  33  */
  34 struct ctdbd_connection *global_ctdbd_connection;
  35
  36 struct ctdbd_connection *messaging_ctdbd_connection(void)
  37 {
  38         return global_ctdbd_connection;
  39 }
  40
  41 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  42                                     struct server_id pid, int msg_type,
  43                                     const DATA_BLOB *data,
  44                                     struct messaging_backend *backend)
  45 {
  46         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  47                 backend->private_data, struct messaging_ctdbd_context);
  48
  49         struct messaging_rec msg;
  50
  51         msg.msg_version = MESSAGE_VERSION;
  52         msg.msg_type    = msg_type;
  53         msg.dest        = pid;
  54         msg.src         = procid_self();
  55         msg.buf         = *data;
  56
  57         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  58 }
  59
  60 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  61 {
  62         /*
  63          * The global connection just went away
  64          */
  65         global_ctdbd_connection = NULL;
  66         return 0;
  67 }
  68
  69 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
  70                               TALLOC_CTX *mem_ctx,
  71                               struct messaging_backend **presult)
  72 {
  73         struct messaging_backend *result;
  74         struct messaging_ctdbd_context *ctx;
  75         NTSTATUS status;
  76
  77         if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
  78                 DEBUG(0, ("talloc failed\n"));
  79                 return NT_STATUS_NO_MEMORY;
  80         }
  81
  82         if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
  83                 DEBUG(0, ("talloc failed\n"));
  84                 TALLOC_FREE(result);
  85                 return NT_STATUS_NO_MEMORY;
  86         }
  87
  88         status = ctdbd_messaging_connection(ctx, &ctx->conn);
  89
  90         if (!NT_STATUS_IS_OK(status)) {
  91                 DEBUG(10, ("ctdbd_init_connection failed: %s\n",
  92                            nt_errstr(status)));
  93                 TALLOC_FREE(result);
  94                 return status;
  95         }
  96
  97         global_ctdbd_connection = ctx->conn;
  98         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
  99
 100         set_my_vnn(ctdbd_vnn(ctx->conn));
 101
 102         result->send_fn = messaging_ctdb_send;
 103         result->private_data = (void *)ctx;
 104
 105         *presult = result;
 106         return NT_STATUS_OK;
 107 }
 108
 109 #else
 110
 111 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 112                               TALLOC_CTX *mem_ctx,
 113                               struct messaging_backend **presult)
 114 {
 115         return NT_STATUS_NOT_IMPLEMENTED;
 116 }
 117
 118 #endif