zone.c revision 821c4a97a0dd1db2e255dea754bfa66290ce7d8a
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#pragma weak getzoneid = _getzoneid
30#pragma weak getzoneidbyname = _getzoneidbyname
31#pragma weak getzonenamebyid = _getzonenamebyid
32
33#include "synonyms.h"
34#include <sys/types.h>
35#include <sys/syscall.h>
36#include <sys/zone.h>
37#include <sys/priv.h>
38#include <priv_private.h>
39#include <zone.h>
40#include <dlfcn.h>
41#include <stdlib.h>
42#include <errno.h>
43
44extern zoneid_t
45zone_create(const char *name, const char *root, const struct priv_set *privs,
46    const char *rctls, size_t rctlsz, const char *zfs, size_t zfssz,
47    int *extended_error)
48{
49	zone_def  zd;
50	priv_data_t *d;
51
52	LOADPRIVDATA(d);
53
54	zd.zone_name = name;
55	zd.zone_root = root;
56	zd.zone_privs = privs;
57	zd.zone_privssz = d->pd_setsize;
58	zd.rctlbuf = rctls;
59	zd.rctlbufsz = rctlsz;
60	zd.zfsbuf = zfs;
61	zd.zfsbufsz = zfssz;
62	zd.extended_error = extended_error;
63
64	return ((zoneid_t)syscall(SYS_zone, ZONE_CREATE, &zd));
65}
66
67int
68zone_boot(zoneid_t zoneid, const char *bootargs)
69{
70	return (syscall(SYS_zone, ZONE_BOOT, zoneid, bootargs));
71}
72
73int
74zone_shutdown(zoneid_t zoneid)
75{
76	return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid));
77}
78
79int
80zone_destroy(zoneid_t zoneid)
81{
82	return (syscall(SYS_zone, ZONE_DESTROY, zoneid));
83}
84
85ssize_t
86zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size)
87{
88	sysret_t rval;
89	int error;
90
91	error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid,
92	    attr, valp, size);
93	if (error)
94		(void) __set_errno(error);
95	return ((ssize_t)rval.sys_rval1);
96}
97
98int
99zone_enter(zoneid_t zoneid)
100{
101	return (syscall(SYS_zone, ZONE_ENTER, zoneid));
102}
103
104/*
105 * Get id (if any) for specified zone.
106 *
107 * Call the real zone_get_id() in libzonecfg.so.1 if it can be found.
108 * Otherwise, perform a stripped-down version of the function.
109 * Any changes in one version should probably be reflected in the other.
110 *
111 * This stripped-down version of the function only checks for active
112 * (booted) zones, by numeric id or name.
113 */
114
115typedef	int (*zone_get_id_t)(const char *, zoneid_t *);
116static zone_get_id_t real_zone_get_id = NULL;
117
118int
119zone_get_id(const char *str, zoneid_t *zip)
120{
121	zoneid_t zoneid;
122	char *cp;
123
124	/*
125	 * The first time we are called, attempt to dlopen() libzonecfg.so.1
126	 * and get a pointer to the real zone_get_id().
127	 * If we fail, set our pointer to -1 so we won't try again.
128	 */
129	if (real_zone_get_id == NULL) {
130		/*
131		 * There's no harm in doing this more than once, even
132		 * concurrently.  We will get the same result each time,
133		 * and the dynamic linker will single-thread the dlopen()
134		 * with its own internal lock.  The worst that can happen
135		 * is that the handle gets a reference count greater than
136		 * one, which doesn't matter since we never dlclose()
137		 * the handle if we successfully find the symbol; the
138		 * library just stays in the address space until exit().
139		 */
140		void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY);
141		void *sym = (void *)(-1);
142
143		if (dlhandle != NULL &&
144		    (sym = dlsym(dlhandle, "zone_get_id")) == NULL) {
145			sym = (void *)(-1);
146			(void) dlclose(dlhandle);
147		}
148		real_zone_get_id = (zone_get_id_t)sym;
149	}
150
151	/*
152	 * If we've successfully loaded it, call the real zone_get_id().
153	 * Otherwise, perform our stripped-down version of the code.
154	 */
155	if (real_zone_get_id != (zone_get_id_t)(-1))
156		return (real_zone_get_id(str, zip));
157
158	/* first try looking for active zone by id */
159	errno = 0;
160	zoneid = (zoneid_t)strtol(str, &cp, 0);
161	if (errno == 0 && cp != str && *cp == '\0' &&
162	    getzonenamebyid(zoneid, NULL, 0) != -1) {
163		*zip = zoneid;
164		return (0);
165	}
166
167	/* then look for active zone by name */
168	if ((zoneid = getzoneidbyname(str)) != -1) {
169		*zip = zoneid;
170		return (0);
171	}
172
173	/* not an active zone, return error */
174	return (-1);
175}
176
177int
178zone_list(zoneid_t *zonelist, uint_t *numzones)
179{
180	return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones));
181}
182
183/*
184 * Underlying implementation for getzoneid and getzoneidbyname.
185 */
186static zoneid_t
187zone_lookup(const char *name)
188{
189	return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name));
190}
191
192zoneid_t
193getzoneid(void)
194{
195	return (zone_lookup(NULL));
196}
197
198zoneid_t
199getzoneidbyname(const char *zonename)
200{
201	return (zone_lookup(zonename));
202}
203
204ssize_t
205getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen)
206{
207	return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen));
208}
209
210int
211zone_version(int *version)
212{
213	return (syscall(SYS_zone, ZONE_VERSION, version));
214}
215