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 #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 static struct ctdbd_connection *global_ctdbd_connection;
  39 static int global_ctdb_connection_pid;
  40
  41 struct ctdbd_connection *messaging_ctdbd_connection(void)
  42 {
  43         if (global_ctdb_connection_pid != getpid()) {
  44                 DEBUG(0,("messaging_ctdbd_connection():"
  45                          "valid for pid[%d] but it's [%d]\n",
  46                          global_ctdb_connection_pid, getpid()));
  47                 smb_panic("messaging_ctdbd_connection() invalid process\n");
  48         }
  49
  50         return global_ctdbd_connection;
  51 }
  52
  53 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  54                                     struct server_id pid, int msg_type,
  55                                     const DATA_BLOB *data,
  56                                     struct messaging_backend *backend)
  57 {
  58         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  59                 backend->private_data, struct messaging_ctdbd_context);
  60
  61         struct messaging_rec msg;
  62
  63         msg.msg_version = MESSAGE_VERSION;
  64         msg.msg_type    = msg_type;
  65         msg.dest        = pid;
  66         msg.src         = procid_self();
  67         msg.buf         = *data;
  68
  69         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  70 }
  71
  72 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  73 {
  74         /*
  75          * The global connection just went away
  76          */
  77         global_ctdb_connection_pid = 0;
  78         global_ctdbd_connection = NULL;
  79         return 0;
  80 }
  81
  82 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
  83                               TALLOC_CTX *mem_ctx,
  84                               struct messaging_backend **presult)
  85 {
  86         struct messaging_backend *result;
  87         struct messaging_ctdbd_context *ctx;
  88         NTSTATUS status;
  89
  90         if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
  91                 DEBUG(0, ("talloc failed\n"));
  92                 return NT_STATUS_NO_MEMORY;
  93         }
  94
  95         if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
  96                 DEBUG(0, ("talloc failed\n"));
  97                 TALLOC_FREE(result);
  98                 return NT_STATUS_NO_MEMORY;
  99         }
 100
 101         status = ctdbd_messaging_connection(ctx, &ctx->conn);
 102
 103         if (!NT_STATUS_IS_OK(status)) {
 104                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
 105                            nt_errstr(status)));
 106                 TALLOC_FREE(result);
 107                 return status;
 108         }
 109
 110         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 111
 112         if (!NT_STATUS_IS_OK(status)) {
 113                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 114                            nt_errstr(status)));
 115                 TALLOC_FREE(result);
 116                 return status;
 117         }
 118
 119         global_ctdb_connection_pid = getpid();
 120         global_ctdbd_connection = ctx->conn;
 121         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 122
 123         set_my_vnn(ctdbd_vnn(ctx->conn));
 124
 125         result->send_fn = messaging_ctdb_send;
 126         result->private_data = (void *)ctx;
 127
 128         *presult = result;
 129         return NT_STATUS_OK;
 130 }
 131
 132 #else
 133
 134 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 135                               TALLOC_CTX *mem_ctx,
 136                               struct messaging_backend **presult)
 137 {
 138         return NT_STATUS_NOT_IMPLEMENTED;
 139 }
 140
 141 #endif