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 2 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, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 #ifdef CLUSTER_SUPPORT
  24
  25 #include "librpc/gen_ndr/messaging.h"
  26
  27 struct messaging_ctdbd_context {
  28         struct ctdbd_connection *conn;
  29 };
  30
  31 /*
  32  * This is a Samba3 hack/optimization. Routines like process_exists need to
  33  * talk to ctdbd, and they don't get handed a messaging context.
  34  */
  35 struct ctdbd_connection *global_ctdbd_connection;
  36
  37 struct ctdbd_connection *messaging_ctdbd_connection(void)
  38 {
  39         return global_ctdbd_connection;
  40 }
  41
  42 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  43                                     struct server_id pid, int msg_type,
  44                                     const DATA_BLOB *data,
  45                                     struct messaging_backend *backend)
  46 {
  47         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  48                 backend->private_data, struct messaging_ctdbd_context);
  49
  50         struct messaging_rec msg;
  51
  52         msg.msg_version = MESSAGE_VERSION;
  53         msg.msg_type    = msg_type;
  54         msg.dest        = pid;
  55         msg.src         = procid_self();
  56         msg.buf         = *data;
  57
  58         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  59 }
  60
  61 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  62 {
  63         /*
  64          * The global connection just went away
  65          */
  66         global_ctdbd_connection = NULL;
  67         return 0;
  68 }
  69
  70 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
  71                               TALLOC_CTX *mem_ctx,
  72                               struct messaging_backend **presult)
  73 {
  74         struct messaging_backend *result;
  75         struct messaging_ctdbd_context *ctx;
  76         NTSTATUS status;
  77
  78         if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
  79                 DEBUG(0, ("talloc failed\n"));
  80                 return NT_STATUS_NO_MEMORY;
  81         }
  82
  83         if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
  84                 DEBUG(0, ("talloc failed\n"));
  85                 TALLOC_FREE(result);
  86                 return NT_STATUS_NO_MEMORY;
  87         }
  88
  89         status = ctdbd_messaging_connection(ctx, &ctx->conn);
  90
  91         if (!NT_STATUS_IS_OK(status)) {
  92                 DEBUG(10, ("ctdbd_init_connection failed: %s\n",
  93                            nt_errstr(status)));
  94                 TALLOC_FREE(result);
  95                 return status;
  96         }
  97
  98         global_ctdbd_connection = ctx->conn;
  99         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 100
 101         set_my_vnn(ctdbd_vnn(ctx->conn));
 102
 103         result->send_fn = messaging_ctdb_send;
 104         result->private_data = (void *)ctx;
 105
 106         *presult = result;
 107         return NT_STATUS_OK;
 108 }
 109
 110 #else
 111
 112 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 113                               TALLOC_CTX *mem_ctx,
 114                               struct messaging_backend **presult)
 115 {
 116         return NT_STATUS_NOT_IMPLEMENTED;
 117 }
 118
 119 #endif