zone.c revision 3f2f09c1efd66f6d2995998ea72c5df8c70c9a97
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 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#pragma ident	"%Z%%M%	%I%	%E% SMI"
27
28#pragma weak getzoneid = _getzoneid
29#pragma weak getzoneidbyname = _getzoneidbyname
30#pragma weak getzonenamebyid = _getzonenamebyid
31
32#include "synonyms.h"
33#include <sys/types.h>
34#include <sys/syscall.h>
35#include <sys/zone.h>
36#include <sys/priv.h>
37#include <priv_private.h>
38#include <zone.h>
39#include <sys/tsol/label.h>
40#include <dlfcn.h>
41#include <stdlib.h>
42#include <errno.h>
43
44zoneid_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, int match, int doi, const bslabel_t *label)
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	zd.match = match;
64	zd.doi = doi;
65	zd.label = label;
66
67	return ((zoneid_t)syscall(SYS_zone, ZONE_CREATE, &zd));
68}
69
70int
71zone_boot(zoneid_t zoneid)
72{
73	return (syscall(SYS_zone, ZONE_BOOT, zoneid));
74}
75
76int
77zone_shutdown(zoneid_t zoneid)
78{
79	return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid));
80}
81
82int
83zone_destroy(zoneid_t zoneid)
84{
85	return (syscall(SYS_zone, ZONE_DESTROY, zoneid));
86}
87
88ssize_t
89zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size)
90{
91	sysret_t rval;
92	int error;
93
94	error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid,
95	    attr, valp, size);
96	if (error)
97		(void) __set_errno(error);
98	return ((ssize_t)rval.sys_rval1);
99}
100
101int
102zone_setattr(zoneid_t zoneid, int attr, void *valp, size_t size)
103{
104	return (syscall(SYS_zone, ZONE_SETATTR, zoneid, attr, valp, size));
105}
106
107int
108zone_enter(zoneid_t zoneid)
109{
110	return (syscall(SYS_zone, ZONE_ENTER, zoneid));
111}
112
113/*
114 * Get id (if any) for specified zone.
115 *
116 * Call the real zone_get_id() in libzonecfg.so.1 if it can be found.
117 * Otherwise, perform a stripped-down version of the function.
118 * Any changes in one version should probably be reflected in the other.
119 *
120 * This stripped-down version of the function only checks for active
121 * (booted) zones, by numeric id or name.
122 */
123
124typedef	int (*zone_get_id_t)(const char *, zoneid_t *);
125static zone_get_id_t real_zone_get_id = NULL;
126
127int
128zone_get_id(const char *str, zoneid_t *zip)
129{
130	zoneid_t zoneid;
131	char *cp;
132
133	/*
134	 * The first time we are called, attempt to dlopen() libzonecfg.so.1
135	 * and get a pointer to the real zone_get_id().
136	 * If we fail, set our pointer to -1 so we won't try again.
137	 */
138	if (real_zone_get_id == NULL) {
139		/*
140		 * There's no harm in doing this more than once, even
141		 * concurrently.  We will get the same result each time,
142		 * and the dynamic linker will single-thread the dlopen()
143		 * with its own internal lock.  The worst that can happen
144		 * is that the handle gets a reference count greater than
145		 * one, which doesn't matter since we never dlclose()
146		 * the handle if we successfully find the symbol; the
147		 * library just stays in the address space until exit().
148		 */
149		void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY);
150		void *sym = (void *)(-1);
151
152		if (dlhandle != NULL &&
153		    (sym = dlsym(dlhandle, "zone_get_id")) == NULL) {
154			sym = (void *)(-1);
155			(void) dlclose(dlhandle);
156		}
157		real_zone_get_id = (zone_get_id_t)sym;
158	}
159
160	/*
161	 * If we've successfully loaded it, call the real zone_get_id().
162	 * Otherwise, perform our stripped-down version of the code.
163	 */
164	if (real_zone_get_id != (zone_get_id_t)(-1))
165		return (real_zone_get_id(str, zip));
166
167	/* first try looking for active zone by id */
168	errno = 0;
169	zoneid = (zoneid_t)strtol(str, &cp, 0);
170	if (errno == 0 && cp != str && *cp == '\0' &&
171	    getzonenamebyid(zoneid, NULL, 0) != -1) {
172		*zip = zoneid;
173		return (0);
174	}
175
176	/* then look for active zone by name */
177	if ((zoneid = getzoneidbyname(str)) != -1) {
178		*zip = zoneid;
179		return (0);
180	}
181
182	/* not an active zone, return error */
183	return (-1);
184}
185
186int
187zone_list(zoneid_t *zonelist, uint_t *numzones)
188{
189	return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones));
190}
191
192/*
193 * Underlying implementation for getzoneid and getzoneidbyname.
194 */
195static zoneid_t
196zone_lookup(const char *name)
197{
198	return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name));
199}
200
201zoneid_t
202getzoneid(void)
203{
204	return (zone_lookup(NULL));
205}
206
207zoneid_t
208getzoneidbyname(const char *zonename)
209{
210	return (zone_lookup(zonename));
211}
212
213ssize_t
214getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen)
215{
216	return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen));
217}
218
219int
220zone_version(int *version)
221{
222	return (syscall(SYS_zone, ZONE_VERSION, version));
223}
224