xref: /titanic_51/usr/src/lib/libc/sparc/sys/uadmin.c (revision ce0d9371c4da921f289a8bc7fd846d3bf1b8cca7)
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 }
147