zone.c revision f4b3ec61df05330d25f55a36b975b4d7519fdeb1
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 2007 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, int flags)
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	zd.flags = flags;
67
68	return ((zoneid_t)syscall(SYS_zone, ZONE_CREATE, &zd));
69}
70
71int
72zone_boot(zoneid_t zoneid)
73{
74	return (syscall(SYS_zone, ZONE_BOOT, zoneid));
75}
76
77int
78zone_shutdown(zoneid_t zoneid)
79{
80	return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid));
81}
82
83int
84zone_destroy(zoneid_t zoneid)
85{
86	return (syscall(SYS_zone, ZONE_DESTROY, zoneid));
87}
88
89ssize_t
90zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size)
91{
92	sysret_t rval;
93	int error;
94
95	error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid,
96	    attr, valp, size);
97	if (error)
98		(void) __set_errno(error);
99	return ((ssize_t)rval.sys_rval1);
100}
101
102int
103zone_setattr(zoneid_t zoneid, int attr, void *valp, size_t size)
104{
105	return (syscall(SYS_zone, ZONE_SETATTR, zoneid, attr, valp, size));
106}
107
108int
109zone_enter(zoneid_t zoneid)
110{
111	return (syscall(SYS_zone, ZONE_ENTER, zoneid));
112}
113
114/*
115 * Get id (if any) for specified zone.
116 *
117 * Call the real zone_get_id() in libzonecfg.so.1 if it can be found.
118 * Otherwise, perform a stripped-down version of the function.
119 * Any changes in one version should probably be reflected in the other.
120 *
121 * This stripped-down version of the function only checks for active
122 * (booted) zones, by numeric id or name.
123 */
124
125typedef	int (*zone_get_id_t)(const char *, zoneid_t *);
126static zone_get_id_t real_zone_get_id = NULL;
127
128int
129zone_get_id(const char *str, zoneid_t *zip)
130{
131	zoneid_t zoneid;
132	char *cp;
133
134	/*
135	 * The first time we are called, attempt to dlopen() libzonecfg.so.1
136	 * and get a pointer to the real zone_get_id().
137	 * If we fail, set our pointer to -1 so we won't try again.
138	 */
139	if (real_zone_get_id == NULL) {
140		/*
141		 * There's no harm in doing this more than once, even
142		 * concurrently.  We will get the same result each time,
143		 * and the dynamic linker will single-thread the dlopen()
144		 * with its own internal lock.  The worst that can happen
145		 * is that the handle gets a reference count greater than
146		 * one, which doesn't matter since we never dlclose()
147		 * the handle if we successfully find the symbol; the
148		 * library just stays in the address space until exit().
149		 */
150		void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY);
151		void *sym = (void *)(-1);
152
153		if (dlhandle != NULL &&
154		    (sym = dlsym(dlhandle, "zone_get_id")) == NULL) {
155			sym = (void *)(-1);
156			(void) dlclose(dlhandle);
157		}
158		real_zone_get_id = (zone_get_id_t)sym;
159	}
160
161	/*
162	 * If we've successfully loaded it, call the real zone_get_id().
163	 * Otherwise, perform our stripped-down version of the code.
164	 */
165	if (real_zone_get_id != (zone_get_id_t)(-1))
166		return (real_zone_get_id(str, zip));
167
168	/* first try looking for active zone by id */
169	errno = 0;
170	zoneid = (zoneid_t)strtol(str, &cp, 0);
171	if (errno == 0 && cp != str && *cp == '\0' &&
172	    getzonenamebyid(zoneid, NULL, 0) != -1) {
173		*zip = zoneid;
174		return (0);
175	}
176
177	/* then look for active zone by name */
178	if ((zoneid = getzoneidbyname(str)) != -1) {
179		*zip = zoneid;
180		return (0);
181	}
182
183	/* not an active zone, return error */
184	return (-1);
185}
186
187int
188zone_list(zoneid_t *zonelist, uint_t *numzones)
189{
190	return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones));
191}
192
193/*
194 * Underlying implementation for getzoneid and getzoneidbyname.
195 */
196static zoneid_t
197zone_lookup(const char *name)
198{
199	return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name));
200}
201
202zoneid_t
203getzoneid(void)
204{
205	return (zone_lookup(NULL));
206}
207
208zoneid_t
209getzoneidbyname(const char *zonename)
210{
211	return (zone_lookup(zonename));
212}
213
214ssize_t
215getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen)
216{
217	return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen));
218}
219
220int
221zone_version(int *version)
222{
223	return (syscall(SYS_zone, ZONE_VERSION, version));
224}
225
226
227int
228zone_add_datalink(zoneid_t zoneid, char *dlname)
229{
230	return (syscall(SYS_zone, ZONE_ADD_DATALINK, zoneid, dlname));
231}
232
233int
234zone_remove_datalink(zoneid_t zoneid, char *dlname)
235{
236	return (syscall(SYS_zone, ZONE_DEL_DATALINK, zoneid, dlname));
237}
238
239int
240zone_check_datalink(zoneid_t *zoneidp, char *dlname)
241{
242	return (syscall(SYS_zone, ZONE_CHECK_DATALINK, zoneidp, dlname));
243}
244
245int
246zone_list_datalink(zoneid_t zoneid, int *dlnump, char *buf)
247{
248	return (syscall(SYS_zone, ZONE_LIST_DATALINK, zoneid, dlnump, buf));
249}
250