source3/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 #include "ctdb.h"
  26 #include "ctdb_private.h"
  27 #include "ctdbd_conn.h"
  28
  29
  30 struct messaging_ctdbd_context {
  31         struct ctdbd_connection *conn;
  32 };
  33
  34 /*
  35  * This is a Samba3 hack/optimization. Routines like process_exists need to
  36  * talk to ctdbd, and they don't get handed a messaging context.
  37  */
  38 struct ctdbd_connection *global_ctdbd_connection;
  39
  40 struct ctdbd_connection *messaging_ctdbd_connection(void)
  41 {
  42         return global_ctdbd_connection;
  43 }
  44
  45 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  46                                     struct server_id pid, int msg_type,
  47                                     const DATA_BLOB *data,
  48                                     struct messaging_backend *backend)
  49 {
  50         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  51                 backend->private_data, struct messaging_ctdbd_context);
  52
  53         struct messaging_rec msg;
  54
  55         msg.msg_version = MESSAGE_VERSION;
  56         msg.msg_type    = msg_type;
  57         msg.dest        = pid;
  58         msg.src         = procid_self();
  59         msg.buf         = *data;
  60
  61         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  62 }
  63
  64 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  65 {
  66         /*
  67          * The global connection just went away
  68          */
  69         global_ctdbd_connection = NULL;
  70         return 0;
  71 }
  72
  73 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
  74                               TALLOC_CTX *mem_ctx,
  75                               struct messaging_backend **presult)
  76 {
  77         struct messaging_backend *result;
  78         struct messaging_ctdbd_context *ctx;
  79         NTSTATUS status;
  80
  81         if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
  82                 DEBUG(0, ("talloc failed\n"));
  83                 return NT_STATUS_NO_MEMORY;
  84         }
  85
  86         if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
  87                 DEBUG(0, ("talloc failed\n"));
  88                 TALLOC_FREE(result);
  89                 return NT_STATUS_NO_MEMORY;
  90         }
  91
  92         status = ctdbd_messaging_connection(ctx, &ctx->conn);
  93
  94         if (!NT_STATUS_IS_OK(status)) {
  95                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
  96                            nt_errstr(status)));
  97                 TALLOC_FREE(result);
  98                 return status;
  99         }
 100
 101         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 102
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 105                            nt_errstr(status)));
 106                 TALLOC_FREE(result);
 107                 return status;
 108         }
 109
 110         global_ctdbd_connection = ctx->conn;
 111         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 112
 113         set_my_vnn(ctdbd_vnn(ctx->conn));
 114
 115         result->send_fn = messaging_ctdb_send;
 116         result->private_data = (void *)ctx;
 117
 118         *presult = result;
 119         return NT_STATUS_OK;
 120 }
 121
 122 #else
 123
 124 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 125                               TALLOC_CTX *mem_ctx,
 126                               struct messaging_backend **presult)
 127 {
 128         return NT_STATUS_NOT_IMPLEMENTED;
 129 }
 130
 131 #endif