ctdb/cluster/cluster_conf.c

   1 /*
   2    CTDB cluster config handling
   3
   4    Copyright (C) Martin Schwenke  2018
   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 "replace.h"
  21 #include "system/network.h"
  22
  23 #include "lib/util/debug.h"
  24
  25 #include "common/conf.h"
  26
  27 #include "cluster_conf.h"
  28
  29 #define CLUSTER_TRANSPORT_DEFAULT "tcp"
  30
  31 /*
  32  * Ideally this wants to be a void function but it also used directly
  33  * as a validation function
  34  */
  35 static bool check_static_string_change(const char *key,
  36                                        const char *old_value,
  37                                        const char *new_value,
  38                                        enum conf_update_mode mode)
  39 {
  40         if (mode == CONF_MODE_RELOAD) {
  41                 if (strcmp(old_value, new_value) != 0) {
  42                         D_WARNING("Ignoring update of [%s] -> %s\n",
  43                                   CLUSTER_CONF_SECTION,
  44                                   key);
  45                 }
  46         }
  47
  48         return true;
  49 }
  50
  51 static bool validate_transport(const char *key,
  52                                const char *old_transport,
  53                                const char *new_transport,
  54                                enum conf_update_mode mode)
  55 {
  56         /* Don't allow "ib" for now.  It is broken! */
  57         if (strcmp(new_transport, CLUSTER_TRANSPORT_DEFAULT) != 0) {
  58                 D_ERR("Invalid value for [cluster] -> transport = %s\n",
  59                       new_transport);
  60                 return false;
  61         }
  62
  63         /* This sometimes warns but always returns true */
  64         return check_static_string_change(key,
  65                                           old_transport,
  66                                           new_transport,
  67                                           mode);
  68 }
  69
  70 static bool validate_node_address(const char *key,
  71                                   const char *old_node_address,
  72                                   const char *new_node_address,
  73                                   enum conf_update_mode mode)
  74 {
  75         struct in_addr addr4;
  76         struct in6_addr addr6;
  77         int ret;
  78
  79         if (new_node_address == NULL) {
  80                 goto good;
  81         }
  82
  83         ret = inet_pton(AF_INET, new_node_address, &addr4);
  84         if (ret == 1) {
  85                 goto good;
  86         }
  87
  88         ret = inet_pton(AF_INET6, new_node_address, &addr6);
  89         if (ret == 1) {
  90                 goto good;
  91         }
  92
  93         D_ERR("Invalid value for [cluster] -> node address = %s\n",
  94               new_node_address);
  95         return false;
  96
  97 good:
  98         /* This sometimes warns but always returns true */
  99         return check_static_string_change(key,
 100                                           old_node_address,
 101                                           new_node_address,
 102                                           mode);
 103 }
 104
 105 void cluster_conf_init(struct conf_context *conf)
 106 {
 107         conf_define_section(conf, CLUSTER_CONF_SECTION, NULL);
 108
 109         conf_define_string(conf,
 110                            CLUSTER_CONF_SECTION,
 111                            CLUSTER_CONF_TRANSPORT,
 112                            CLUSTER_TRANSPORT_DEFAULT,
 113                            validate_transport);
 114         conf_define_string(conf,
 115                            CLUSTER_CONF_SECTION,
 116                            CLUSTER_CONF_NODE_ADDRESS,
 117                            NULL,
 118                            validate_node_address);
 119         conf_define_string(conf,
 120                            CLUSTER_CONF_SECTION,
 121                            CLUSTER_CONF_RECOVERY_LOCK,
 122                            NULL,
 123                            check_static_string_change);
 124 }