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 (!lp_clustering()) {
  63                 return NULL;
  64         }
  65
  66         if (global_ctdb_connection_pid == 0 &&
  67             global_ctdbd_connection == NULL) {
  68                 struct tevent_context *ev;
  69                 struct messaging_context *msg;
  70
  71                 ev = samba_tevent_context_init(NULL);
  72                 if (!ev) {
  73                         DEBUG(0,("samba_tevent_context_init failed\n"));
  74                 }
  75
  76                 msg = messaging_init(NULL, ev);
  77                 if (!msg) {
  78                         DEBUG(0,("messaging_init failed\n"));
  79                         return NULL;
  80                 }
  81         }
  82
  83         if (global_ctdb_connection_pid != getpid()) {
  84                 DEBUG(0,("messaging_ctdbd_connection():"
  85                          "valid for pid[%d] but it's [%d]\n",
  86                          global_ctdb_connection_pid, getpid()));
  87                 smb_panic("messaging_ctdbd_connection() invalid process\n");
  88         }
  89
  90         return global_ctdbd_connection;
  91 }
  92
  93 static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
  94                                     struct server_id pid, int msg_type,
  95                                     const DATA_BLOB *data,
  96                                     struct messaging_backend *backend)
  97 {
  98         struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
  99                 backend->private_data, struct messaging_ctdbd_context);
 100
 101         struct messaging_rec msg;
 102
 103         msg.msg_version = MESSAGE_VERSION;
 104         msg.msg_type    = msg_type;
 105         msg.dest        = pid;
 106         msg.src         = msg_ctx->id;
 107         msg.buf         = *data;
 108
 109         return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
 110 }
 111
 112 static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
 113 {
 114         /*
 115          * The global connection just went away
 116          */
 117         global_ctdb_connection_pid = 0;
 118         global_ctdbd_connection = NULL;
 119         return 0;
 120 }
 121
 122 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 123                               TALLOC_CTX *mem_ctx,
 124                               struct messaging_backend **presult)
 125 {
 126         struct messaging_backend *result;
 127         struct messaging_ctdbd_context *ctx;
 128         NTSTATUS status;
 129
 130         if (!(result = talloc(mem_ctx, struct messaging_backend))) {
 131                 DEBUG(0, ("talloc failed\n"));
 132                 return NT_STATUS_NO_MEMORY;
 133         }
 134
 135         if (!(ctx = talloc(result, struct messaging_ctdbd_context))) {
 136                 DEBUG(0, ("talloc failed\n"));
 137                 TALLOC_FREE(result);
 138                 return NT_STATUS_NO_MEMORY;
 139         }
 140
 141         status = ctdbd_messaging_connection(ctx, &ctx->conn);
 142
 143         if (!NT_STATUS_IS_OK(status)) {
 144                 DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
 145                            nt_errstr(status)));
 146                 TALLOC_FREE(result);
 147                 return status;
 148         }
 149
 150         status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);
 151
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
 154                            nt_errstr(status)));
 155                 TALLOC_FREE(result);
 156                 return status;
 157         }
 158
 159         global_ctdb_connection_pid = getpid();
 160         global_ctdbd_connection = ctx->conn;
 161         talloc_set_destructor(ctx, messaging_ctdbd_destructor);
 162
 163         set_my_vnn(ctdbd_vnn(ctx->conn));
 164
 165         result->send_fn = messaging_ctdb_send;
 166         result->private_data = (void *)ctx;
 167
 168         *presult = result;
 169         return NT_STATUS_OK;
 170 }
 171
 172 #else
 173
 174 NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
 175                               TALLOC_CTX *mem_ctx,
 176                               struct messaging_backend **presult)
 177 {
 178         return NT_STATUS_NOT_IMPLEMENTED;
 179 }
 180
 181 struct ctdbd_connection *messaging_ctdbd_connection(void)
 182 {
 183         return NULL;
 184 }
 185
 186 #endif