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 #include "messages.h"
  22 #include "util_tdb.h"
  23
  24 #ifdef CLUSTER_SUPPORT
  25
  26 /*
  27  * It is not possible to include ctdb.h and tdb_compat.h (included via
  28  * some other include above) without warnings. This fixes those
  29  * warnings.
  30  */
  31
  32 #ifdef typesafe_cb
  33 #undef typesafe_cb
  34 #endif
  35
  36 #ifdef typesafe_cb_preargs
  37 #undef typesafe_cb_preargs
  38 #endif
  39
  40 #ifdef typesafe_cb_postargs
  41 #undef typesafe_cb_postargs
  42 #endif
  43
  44 #include "ctdb.h"
  45 #include "ctdb_private.h"
  46 #include "ctdbd_conn.h"
  47
  48
  49 struct messaging_ctdbd_context {
  50         struct ctdbd_connection *conn;
  51 };
  52
  53 /*
  54  * This is a Samba3 hack/optimization. Routines like process_exists need to
  55  * talk to ctdbd, and they don't get handed a messaging context.
  56  */
  57 static struct ctdbd_connection *global_ctdbd_connection;
  58 static int global_ctdb_connection_pid;
  59
  60 struct ctdbd_connection *messaging_ctdbd_connection(void)
  61 {
  62         if (global_ctdb_connection_pid == 0 &&
  63             global_ctdbd_connection == NULL) {
  64                 struct event_context *ev;
  65                 struct messaging_context *msg;
  66
  67                 ev = event_context_init(NULL);
  68                 if (!ev) {
  69                         DEBUG(0,("event_context_init failed\n"));
  70                 }
  71
  72                 msg = messaging_init(NULL, ev);
  73                 if (!msg) {
  74                         DEBUG(0,("messaging_init failed\n"));
  75                         return NULL;
  76                 }
  77         }
  78
  79         if (global_ctdb_connection_pid != getpid()) {
  80                 DEBUG(0,("messaging_ctdbd_connection():"
  81                          "valid for pid[%d] but it's [%d]\n",
  82                          global_ctdb_connection_pid, getpid()));
  83                 smb_panic("messaging_ctdbd_connection() invalid process\n");
  84         }
  85
  86         return global_ctdbd_connection;
  87 }
  88
  89 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  90                                     struct server_id pid, int msg_type,
  91                                     const DATA_BLOB *data,
  92                                     struct messaging_backend *backend)
  93 {
  94         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  95                 backend->private_data, struct messaging_ctdbd_context);
  96
  97         struct messaging_rec msg;
  98
  99         msg.msg_version = MESSAGE_VERSION;
 100         msg.msg_type    = msg_type;
 101         msg.dest        = pid;
 102         msg.src         = msg_ctx->id;
 103         msg.buf         = *data;
 104
 105         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
 106 }
 107
 108 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
 109 {
 110         /*
 111          * The global connection just went away
 112          */
 113         global_ctdb_connection_pid = 0;
 114         global_ctdbd_connection = NULL;
 115         return 0;
 116 }
 117
 118 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 119                               TALLOC_CTX *mem_ctx,
 120                               struct messaging_backend **presult)
 121 {
 122         struct messaging_backend *result;
 123         struct messaging_ctdbd_context *ctx;
 124         NTSTATUS status;
 125
 126         if (!(result = talloc(mem_ctx, struct messaging_backend))) {
 127                 DEBUG(0, ("talloc failed\n"));
 128                 return NT_STATUS_NO_MEMORY;
 129         }
 130
 131         if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
 132                 DEBUG(0, ("talloc failed\n"));
 133                 TALLOC_FREE(result);
 134                 return NT_STATUS_NO_MEMORY;
 135         }
 136
 137         status = ctdbd_messaging_connection(ctx, &ctx->conn);
 138
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
 141                            nt_errstr(status)));
 142                 TALLOC_FREE(result);
 143                 return status;
 144         }
 145
 146         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 147
 148         if (!NT_STATUS_IS_OK(status)) {
 149                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 150                            nt_errstr(status)));
 151                 TALLOC_FREE(result);
 152                 return status;
 153         }
 154
 155         global_ctdb_connection_pid = getpid();
 156         global_ctdbd_connection = ctx->conn;
 157         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 158
 159         set_my_vnn(ctdbd_vnn(ctx->conn));
 160
 161         result->send_fn = messaging_ctdb_send;
 162         result->private_data = (void *)ctx;
 163
 164         *presult = result;
 165         return NT_STATUS_OK;
 166 }
 167
 168 #else
 169
 170 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 171                               TALLOC_CTX *mem_ctx,
 172                               struct messaging_backend **presult)
 173 {
 174         return NT_STATUS_NOT_IMPLEMENTED;
 175 }
 176
 177 #endif