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 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 == 0 &&
  44             global_ctdbd_connection == NULL) {
  45                 struct event_context *ev;
  46                 struct messaging_context *msg;
  47
  48                 ev = event_context_init(NULL);
  49                 if (!ev) {
  50                         DEBUG(0,("event_context_init failed\n"));
  51                 }
  52
  53                 msg = messaging_init(NULL, procid_self(), ev);
  54                 if (!msg) {
  55                         DEBUG(0,("messaging_init failed\n"));
  56                         return NULL;
  57                 }
  58         }
  59
  60         if (global_ctdb_connection_pid != getpid()) {
  61                 DEBUG(0,("messaging_ctdbd_connection():"
  62                          "valid for pid[%d] but it's [%d]\n",
  63                          global_ctdb_connection_pid, getpid()));
  64                 smb_panic("messaging_ctdbd_connection() invalid process\n");
  65         }
  66
  67         return global_ctdbd_connection;
  68 }
  69
  70 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  71                                     struct server_id pid, int msg_type,
  72                                     const DATA_BLOB *data,
  73                                     struct messaging_backend *backend)
  74 {
  75         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  76                 backend->private_data, struct messaging_ctdbd_context);
  77
  78         struct messaging_rec msg;
  79
  80         msg.msg_version = MESSAGE_VERSION;
  81         msg.msg_type    = msg_type;
  82         msg.dest        = pid;
  83         msg.src         = procid_self();
  84         msg.buf         = *data;
  85
  86         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
  87 }
  88
  89 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
  90 {
  91         /*
  92          * The global connection just went away
  93          */
  94         global_ctdb_connection_pid = 0;
  95         global_ctdbd_connection = NULL;
  96         return 0;
  97 }
  98
  99 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 100                               TALLOC_CTX *mem_ctx,
 101                               struct messaging_backend **presult)
 102 {
 103         struct messaging_backend *result;
 104         struct messaging_ctdbd_context *ctx;
 105         NTSTATUS status;
 106
 107         if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
 108                 DEBUG(0, ("talloc failed\n"));
 109                 return NT_STATUS_NO_MEMORY;
 110         }
 111
 112         if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
 113                 DEBUG(0, ("talloc failed\n"));
 114                 TALLOC_FREE(result);
 115                 return NT_STATUS_NO_MEMORY;
 116         }
 117
 118         status = ctdbd_messaging_connection(ctx, &ctx->conn);
 119
 120         if (!NT_STATUS_IS_OK(status)) {
 121                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
 122                            nt_errstr(status)));
 123                 TALLOC_FREE(result);
 124                 return status;
 125         }
 126
 127         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 128
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 131                            nt_errstr(status)));
 132                 TALLOC_FREE(result);
 133                 return status;
 134         }
 135
 136         global_ctdb_connection_pid = getpid();
 137         global_ctdbd_connection = ctx->conn;
 138         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 139
 140         set_my_vnn(ctdbd_vnn(ctx->conn));
 141
 142         result->send_fn = messaging_ctdb_send;
 143         result->private_data = (void *)ctx;
 144
 145         *presult = result;
 146         return NT_STATUS_OK;
 147 }
 148
 149 #else
 150
 151 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 152                               TALLOC_CTX *mem_ctx,
 153                               struct messaging_backend **presult)
 154 {
 155         return NT_STATUS_NOT_IMPLEMENTED;
 156 }
 157
 158 #endif