usr/src/lib/libc/sparc/sys/uadmin.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 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #include "mtlib.h"
  27 #include <sys/types.h>
  28 #include <libscf.h>
  29 #include <sys/uadmin.h>
  30 #include <unistd.h>
  31 #include <stdlib.h>
  32 #include <zone.h>
  33 #include <thread.h>
  34 #include <dlfcn.h>
  35 #include <atomic.h>
  36
  37 /*
  38  * Pull in the following three interfaces from libscf without introducing
  39  * a dependency on it, which since libscf depends on libc would be circular:
  40  *
  41  * scf_simple_prop_get
  42  * scf_simple_prop_next_boolean
  43  * scf_simple_prop_free
  44  */
  45 typedef scf_simple_prop_t *(*scf_simple_prop_get_t)(scf_handle_t *,
  46     const char *, const char *, const char *);
  47 static scf_simple_prop_get_t real_scf_simple_prop_get = NULL;
  48 typedef uint8_t *(*scf_simple_prop_next_boolean_t)(scf_simple_prop_t *);
  49 static scf_simple_prop_next_boolean_t real_scf_simple_prop_next_boolean = NULL;
  50 typedef void (*scf_simple_prop_free_t)(scf_simple_prop_t *);
  51 static scf_simple_prop_free_t real_scf_simple_prop_free = NULL;
  52 static mutex_t scf_lock = DEFAULTMUTEX;
  53
  54 static void
  55 load_scf(void)
  56 {
  57         void *scf_handle = dlopen("libscf.so.1", RTLD_LAZY);
  58         scf_simple_prop_get_t scf_simple_prop_get = (scf_handle == NULL)? NULL :
  59             (scf_simple_prop_get_t)dlsym(scf_handle, "scf_simple_prop_get");
  60         scf_simple_prop_next_boolean_t scf_simple_prop_next_boolean =
  61             (scf_handle == NULL)? NULL :
  62             (scf_simple_prop_next_boolean_t)dlsym(scf_handle,
  63             "scf_simple_prop_next_boolean");
  64         scf_simple_prop_free_t scf_simple_prop_free =
  65             (scf_handle == NULL)? NULL :
  66             (scf_simple_prop_free_t)dlsym(scf_handle, "scf_simple_prop_free");
  67
  68         lmutex_lock(&scf_lock);
  69         if (real_scf_simple_prop_get == NULL ||
  70             real_scf_simple_prop_next_boolean == NULL ||
  71             real_scf_simple_prop_free == NULL) {
  72                 if (scf_simple_prop_get == NULL)
  73                         real_scf_simple_prop_get = (scf_simple_prop_get_t)(-1);
  74                 else {
  75                         real_scf_simple_prop_get = scf_simple_prop_get;
  76                         scf_handle = NULL;      /* don't dlclose it */
  77                 }
  78                 if (scf_simple_prop_next_boolean == NULL)
  79                         real_scf_simple_prop_next_boolean =
  80                             (scf_simple_prop_next_boolean_t)(-1);
  81                 else {
  82                         real_scf_simple_prop_next_boolean =
  83                             scf_simple_prop_next_boolean;
  84                         scf_handle = NULL;      /* don't dlclose it */
  85                 }
  86                 if (scf_simple_prop_free == NULL)
  87                         real_scf_simple_prop_free =
  88                             (scf_simple_prop_free_t)(-1);
  89                 else {
  90                         real_scf_simple_prop_free = scf_simple_prop_free;
  91                         scf_handle = NULL;      /* don't dlclose it */
  92                 }
  93                 membar_producer();
  94         }
  95         lmutex_unlock(&scf_lock);
  96
  97         if (scf_handle)
  98                 (void) dlclose(scf_handle);
  99 }
 100
 101 static void
 102 check_archive_update(void)
 103 {
 104         scf_simple_prop_t *prop = NULL;
 105         boolean_t update_flag = B_FALSE;
 106         char *fmri = "svc:/system/boot-config:default";
 107         uint8_t *ret_val = NULL;
 108
 109         if (real_scf_simple_prop_get == NULL ||
 110             real_scf_simple_prop_next_boolean == NULL ||
 111             real_scf_simple_prop_free == NULL) {
 112                 load_scf();
 113         }
 114         if (real_scf_simple_prop_get == (scf_simple_prop_get_t)(-1) ||
 115             real_scf_simple_prop_next_boolean ==
 116             (scf_simple_prop_next_boolean_t)(-1) ||
 117             real_scf_simple_prop_free == (scf_simple_prop_free_t)(-1)) {
 118                 return;
 119         }
 120
 121         prop = real_scf_simple_prop_get(NULL, fmri, "config",
 122             "uadmin_boot_archive_sync");
 123         if (prop) {
 124                 if ((ret_val = real_scf_simple_prop_next_boolean(prop)) !=
 125                     NULL)
 126                         update_flag = (*ret_val == 0) ? B_FALSE :
 127                             B_TRUE;
 128                 real_scf_simple_prop_free(prop);
 129         }
 130
 131         if (update_flag == B_TRUE)
 132                 (void) system("/sbin/bootadm update-archive");
 133 }
 134
 135 int
 136 uadmin(int cmd, int fcn, uintptr_t mdep)
 137 {
 138         extern int __uadmin(int cmd, int fcn, uintptr_t mdep);
 139
 140         if (geteuid() == 0 && getzoneid() == GLOBAL_ZONEID &&
 141             (cmd == A_SHUTDOWN || cmd == A_REBOOT)) {
 142                 check_archive_update();
 143         }
 144
 145         return (__uadmin(cmd, fcn, mdep));
 146 }