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 void ctdb_local_node_got_banned(struct ctdb_context *ctdb)
  61 {
  62         struct ctdb_db_context *ctdb_db;
  63
  64         DEBUG(DEBUG_NOTICE, ("This node has been banned - releasing all public "
  65                              "IPs and setting the generation to INVALID.\n"));
  66
  67         /* Reset the generation id to 1 to make us ignore any
  68            REQ/REPLY CALL/DMASTER someone sends to us.
  69            We are now banned so we shouldnt service database calls
  70            anymore.
  71         */
  72         ctdb->vnn_map->generation = INVALID_GENERATION;
  73         for (ctdb_db = ctdb->db_list; ctdb_db != NULL; ctdb_db = ctdb_db->next) {
  74                 ctdb_db->generation = INVALID_GENERATION;
  75         }
  76
  77         /* Recovery daemon will set the recovery mode ACTIVE and freeze
  78          * databases.
  79          */
  80
  81         ctdb_release_all_ips(ctdb);
  82 }
  83
  84 int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata)
  85 {
  86         struct ctdb_ban_state *bantime = (struct ctdb_ban_state *)indata.dptr;
  87         bool already_banned;
  88
  89         DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
  90
  91         if (bantime->pnn != ctdb->pnn) {
  92                 DEBUG(DEBUG_WARNING,
  93                       ("SET_BAN_STATE control for PNN %d ignored\n",
  94                        bantime->pnn));
  95                 return -1;
  96         }
  97
  98         already_banned = false;
  99         if (ctdb->banning_ctx != NULL) {
 100                 talloc_free(ctdb->banning_ctx);
 101                 ctdb->banning_ctx = NULL;
 102                 already_banned = true;
 103         }
 104
 105         if (bantime->time == 0) {
 106                 DEBUG(DEBUG_ERR,("Unbanning this node\n"));
 107                 ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
 108                 return 0;
 109         }
 110
 111         if (ctdb->tunable.enable_bans == 0) {
 112                 DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 113                 return 0;
 114         }
 115
 116         ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_state);
 117         if (ctdb->banning_ctx == NULL) {
 118                 DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
 119                 return -1;
 120         }
 121         *((struct ctdb_ban_state *)(ctdb->banning_ctx)) = *bantime;
 122
 123
 124         DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
 125         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 126
 127         tevent_add_timer(ctdb->ev, ctdb->banning_ctx,
 128                          timeval_current_ofs(bantime->time,0),
 129                          ctdb_ban_node_event, ctdb);
 130
 131         if (!already_banned) {
 132                 ctdb_local_node_got_banned(ctdb);
 133         }
 134         return 0;
 135 }
 136
 137 int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
 138 {
 139         struct ctdb_ban_state *bantime;
 140
 141         bantime = talloc(outdata, struct ctdb_ban_state);
 142         CTDB_NO_MEMORY(ctdb, bantime);
 143
 144         if (ctdb->banning_ctx != NULL) {
 145                 *bantime = *(struct ctdb_ban_state *)(ctdb->banning_ctx);
 146         } else {
 147                 bantime->pnn = ctdb->pnn;
 148                 bantime->time = 0;
 149         }
 150
 151         outdata->dptr  = (uint8_t *)bantime;
 152         outdata->dsize = sizeof(struct ctdb_ban_state);
 153
 154         return 0;
 155 }
 156
 157 /* Routine to ban ourselves for a while when trouble strikes. */
 158 void ctdb_ban_self(struct ctdb_context *ctdb)
 159 {
 160         TDB_DATA data;
 161         struct ctdb_ban_state bantime;
 162
 163         bantime.pnn  = ctdb->pnn;
 164         bantime.time = ctdb->tunable.recovery_ban_period;
 165
 166         data.dsize = sizeof(bantime);
 167         data.dptr  = (uint8_t *)&bantime;
 168
 169         ctdb_control_set_ban_state(ctdb, data);
 170 }