ctdb/server/ctdb_banning.c

   1 /*
   2    ctdb banning code
   3
   4    Copyright (C) Ronnie Sahlberg  2009
   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 #include "replace.h"
  20 #include "system/time.h"
  21 #include "system/network.h"
  22 #include "system/filesys.h"
  23 #include "system/wait.h"
  24
  25 #include <talloc.h>
  26 #include <tevent.h>
  27
  28 #include "lib/util/debug.h"
  29 #include "lib/util/samba_util.h"
  30
  31 #include "ctdb_private.h"
  32 #include "ctdb_client.h"
  33
  34 #include "common/common.h"
  35 #include "common/logging.h"
  36
  37 static void ctdb_ban_node_event(struct tevent_context *ev,
  38                                 struct tevent_timer *te,
  39                                 struct timeval t, void *private_data)
  40 {
  41         struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
  42
  43         /* Make sure we were able to freeze databases during banning */
  44         if (!ctdb_db_all_frozen(ctdb)) {
  45                 DEBUG(DEBUG_ERR, ("Banning timed out, but not all databases "
  46                                   "frozen yet - banning this node again.\n"));
  47                 ctdb_ban_self(ctdb);
  48                 return;
  49         }
  50
  51         DEBUG(DEBUG_ERR,("Banning timed out\n"));
  52         ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_BANNED;
  53
  54         if (ctdb->banning_ctx != NULL) {
  55                 talloc_free(ctdb->banning_ctx);
  56                 ctdb->banning_ctx = NULL;
  57         }
  58 }
  59
  60 int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata)
  61 {
  62         struct ctdb_ban_state *bantime = (struct ctdb_ban_state *)indata.dptr;
  63         bool already_banned;
  64
  65         DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
  66
  67         if (bantime->pnn != ctdb->pnn) {
  68                 DEBUG(DEBUG_WARNING,
  69                       ("SET_BAN_STATE control for PNN %d ignored\n",
  70                        bantime->pnn));
  71                 return -1;
  72         }
  73
  74         already_banned = false;
  75         if (ctdb->banning_ctx != NULL) {
  76                 talloc_free(ctdb->banning_ctx);
  77                 ctdb->banning_ctx = NULL;
  78                 already_banned = true;
  79         }
  80
  81         if (bantime->time == 0) {
  82                 DEBUG(DEBUG_ERR,("Unbanning this node\n"));
  83                 ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
  84                 return 0;
  85         }
  86
  87         if (ctdb->tunable.enable_bans == 0) {
  88                 DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
  89                 return 0;
  90         }
  91
  92         ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_state);
  93         if (ctdb->banning_ctx == NULL) {
  94                 DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
  95                 return -1;
  96         }
  97         *((struct ctdb_ban_state *)(ctdb->banning_ctx)) = *bantime;
  98
  99
 100         DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
 101         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 102
 103         tevent_add_timer(ctdb->ev, ctdb->banning_ctx,
 104                          timeval_current_ofs(bantime->time,0),
 105                          ctdb_ban_node_event, ctdb);
 106
 107         if (!already_banned) {
 108                 ctdb_node_become_inactive(ctdb);
 109         }
 110         return 0;
 111 }
 112
 113 int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
 114 {
 115         struct ctdb_ban_state *bantime;
 116
 117         bantime = talloc(outdata, struct ctdb_ban_state);
 118         CTDB_NO_MEMORY(ctdb, bantime);
 119
 120         if (ctdb->banning_ctx != NULL) {
 121                 *bantime = *(struct ctdb_ban_state *)(ctdb->banning_ctx);
 122         } else {
 123                 bantime->pnn = ctdb->pnn;
 124                 bantime->time = 0;
 125         }
 126
 127         outdata->dptr  = (uint8_t *)bantime;
 128         outdata->dsize = sizeof(struct ctdb_ban_state);
 129
 130         return 0;
 131 }
 132
 133 /* Routine to ban ourselves for a while when trouble strikes. */
 134 void ctdb_ban_self(struct ctdb_context *ctdb)
 135 {
 136         TDB_DATA data;
 137         struct ctdb_ban_state bantime;
 138
 139         bantime.pnn  = ctdb->pnn;
 140         bantime.time = ctdb->tunable.recovery_ban_period;
 141
 142         data.dsize = sizeof(bantime);
 143         data.dptr  = (uint8_t *)&bantime;
 144
 145         ctdb_control_set_ban_state(ctdb, data);
 146 }