usr/src/cmd/nscd/nscd_smfmonitor.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include <stdlib.h>
  27 #include <libscf.h>
  28 #include <string.h>
  29 #include "nscd_switch.h"
  30 #include "nscd_log.h"
  31 #include "nscd_door.h"
  32
  33 extern int      _whoami;
  34
  35 /*
  36  * Service states monitored by nscd. Protected by
  37  * readers/writer lock nscd_smf_service_state_lock
  38  */
  39 nscd_smf_state_t *nscd_smf_service_state;
  40 static rwlock_t nscd_smf_service_state_lock = DEFAULTRWLOCK;
  41 /*
  42  * init service state table
  43  */
  44 nscd_rc_t
  45 _nscd_alloc_service_state_table()
  46 {
  47         int i;
  48
  49         nscd_smf_service_state = calloc(NSCD_NUM_SMF_FMRI,
  50             sizeof (nscd_smf_state_t));
  51
  52         if (nscd_smf_service_state == NULL)
  53                 return (NSCD_NO_MEMORY);
  54
  55         for (i = 1; i < NSCD_NUM_SMF_FMRI; i++)
  56                 NSCD_SMF_SVC_STATE(i) = NSCD_SVC_STATE_UNINITED;
  57
  58         return (NSCD_SUCCESS);
  59 }
  60
  61 static int
  62 query_smf_state(int srci)
  63 {
  64
  65         int     ret = NSCD_SVC_STATE_UNINITED;
  66         char    *state = NULL;
  67         char    *me = "query_smf_state";
  68
  69         state = smf_get_state(NSCD_SMF_SVC_FMRI(srci));
  70         if (state == NULL)
  71                 return (ret);
  72
  73         _NSCD_LOG(NSCD_LOG_SMF_MONITOR, NSCD_LOG_LEVEL_DEBUG)
  74                 (me, "%s -- %s\n", state, NSCD_SMF_SVC_FMRI(srci));
  75
  76         (void) rw_wrlock(&nscd_smf_service_state_lock);
  77
  78         if (nscd_smf_service_state[srci].src_name == NULL)
  79                 nscd_smf_service_state[srci].src_name =
  80                     NSCD_NSW_SRC_NAME(srci);
  81
  82         if (strcmp(state, SCF_STATE_STRING_UNINIT) == 0)
  83                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_UNINIT;
  84         else if (strcmp(state, SCF_STATE_STRING_MAINT) == 0)
  85                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_MAINT;
  86         else if (strcmp(state, SCF_STATE_STRING_OFFLINE) == 0)
  87                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_OFFLINE;
  88         else if (strcmp(state, SCF_STATE_STRING_DISABLED) == 0)
  89                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_DISABLED;
  90         else if (strcmp(state, SCF_STATE_STRING_ONLINE) == 0)
  91                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_ONLINE;
  92         else if (strcmp(state, SCF_STATE_STRING_DEGRADED) == 0)
  93                 NSCD_SMF_SVC_STATE(srci) = SCF_STATE_DEGRADED;
  94
  95         ret = NSCD_SMF_SVC_STATE(srci);
  96         (void) rw_unlock(&nscd_smf_service_state_lock);
  97
  98         free(state);
  99         return (ret);
 100 }
 101
 102 /* ARGSUSED */
 103 static void *
 104 set_smf_state(void *arg)
 105 {
 106
 107         int     i;
 108         int     st;
 109
 110         /*
 111          * the forker nscd needs not monitor the state
 112          * of the client services
 113          */
 114         if (_whoami == NSCD_FORKER)
 115                 thr_exit(0);
 116
 117         /*CONSTCOND*/
 118         while (1) {
 119
 120                 /* skip the first service which is nscd */
 121                 for (i = 1; i < NSCD_NUM_SMF_FMRI; i++) {
 122                         st = query_smf_state(i);
 123                         if (st == NSCD_SVC_STATE_UNINITED)
 124                                 break;
 125                 }
 126
 127                 (void) sleep(NSCD_SW_CFG_G.check_smf_state_interval_g);
 128         }
 129         /* NOTREACHED */
 130         /*LINTED E_FUNC_HAS_NO_RETURN_STMT*/
 131 }
 132
 133 nscd_rc_t
 134 _nscd_init_smf_monitor() {
 135
 136         int     errnum;
 137         char    *me = "_nscd_init_smf_monitor";
 138
 139         _NSCD_LOG(NSCD_LOG_SMF_MONITOR, NSCD_LOG_LEVEL_DEBUG)
 140         (me, "initializing the smf monitor\n");
 141
 142         /*
 143          * start a thread to check the state of the client services
 144          */
 145         if (thr_create(NULL, 0, set_smf_state,
 146                 NULL, THR_DETACHED, NULL) != 0) {
 147                 errnum = errno;
 148                 _NSCD_LOG(NSCD_LOG_SMF_MONITOR, NSCD_LOG_LEVEL_ERROR)
 149                 (me, "thr_create: %s\n", strerror(errnum));
 150                 return (NSCD_THREAD_CREATE_ERROR);
 151         }
 152
 153         return (NSCD_SUCCESS);
 154 }
 155
 156 int
 157 _nscd_get_smf_state(int srci, int dbi, int recheck)
 158 {
 159         int     s;
 160         char    *n;
 161
 162         n = NSCD_NSW_SRC_NAME(srci);
 163
 164         /* the files, compat, and dns backends are always available */
 165         if ((*n == 'f' || *n == 'c' || *n == 'd' || *n == 'a') &&
 166             (strcmp(NSCD_NSW_SRC_NAME(srci), "files") == 0 ||
 167             strcmp(NSCD_NSW_SRC_NAME(srci), "compat") == 0 ||
 168             strcmp(NSCD_NSW_SRC_NAME(srci), "ad") == 0 ||
 169             strcmp(NSCD_NSW_SRC_NAME(srci), "dns") == 0)) {
 170                 return (SCF_STATE_ONLINE);
 171         }
 172
 173         /*
 174          * for the printer database and user backend, treat the
 175          * backend as a unsupported one, as nscd can not access
 176          * the home directory of the user
 177          */
 178         if (*n == 'u' && strcmp(NSCD_NSW_SRC_NAME(srci), "user") == 0) {
 179                 if (strcmp(NSCD_NSW_DB_NAME(dbi), NSS_DBNAM_PRINTERS) == 0)
 180                         return (NSCD_SVC_STATE_UNSUPPORTED_SRC);
 181                 else
 182                         return (SCF_STATE_ONLINE);
 183         }
 184
 185         /*
 186          * Foreign backend is not supported by nscd unless
 187          * the backend supports the nss2 interface (global
 188          * symbol _nss_<backname name>_version is present),
 189          * tell the switch engine to return NSS_TRYLOCAL
 190          * if needed via rc NSCD_SVC_STATE_FOREIGN_SRC.
 191          */
 192         if (srci >= _nscd_cfg_num_nsw_src)
 193                 return (NSCD_SVC_STATE_FOREIGN_SRC);
 194
 195         if (recheck == 1)
 196                 return (query_smf_state(srci));
 197
 198         (void) rw_rdlock(&nscd_smf_service_state_lock);
 199         s = NSCD_SMF_SVC_STATE(srci);
 200         (void) rw_unlock(&nscd_smf_service_state_lock);
 201
 202         /*
 203          * if the state has been queried at least once but is
 204          * still not online, query one more time
 205          */
 206         if (s != NSCD_SVC_STATE_UNINITED && s < SCF_STATE_ONLINE)
 207                 s = query_smf_state(srci);
 208
 209         return (s);
 210 }