xref: /illumos-gate/usr/src/lib/libc/port/sys/zone.c (revision 7c478bd9)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#pragma weak getzoneid = _getzoneid
#pragma weak getzoneidbyname = _getzoneidbyname
#pragma weak getzonenamebyid = _getzonenamebyid

#include "synonyms.h"
#include <sys/types.h>
#include <sys/syscall.h>
#include <sys/zone.h>
#include <sys/priv.h>
#include <zone.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <errno.h>

zoneid_t
zone_create(const char *name, const char *root, const priv_set_t *privs,
    const char *rctls, size_t rctlsz, int *extended_error)
{
	zone_def  zd;

	zd.zone_name = name;
	zd.zone_root = root;
	zd.zone_privs = privs;
	zd.rctlbuf = rctls;
	zd.rctlbufsz = rctlsz;
	zd.extended_error = extended_error;

	return ((zoneid_t)syscall(SYS_zone,
	    ZONE_CREATE, &zd));
}

int
zone_boot(zoneid_t zoneid, const char *bootargs)
{
	return (syscall(SYS_zone, ZONE_BOOT, zoneid, bootargs));
}

int
zone_shutdown(zoneid_t zoneid)
{
	return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid));
}

int
zone_destroy(zoneid_t zoneid)
{
	return (syscall(SYS_zone, ZONE_DESTROY, zoneid));
}

ssize_t
zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size)
{
	sysret_t rval;
	int error;

	error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid,
	    attr, valp, size);
	if (error)
		(void) __set_errno(error);
	return ((ssize_t)rval.sys_rval1);
}

int
zone_enter(zoneid_t zoneid)
{
	return (syscall(SYS_zone, ZONE_ENTER, zoneid));
}

/*
 * Get id (if any) for specified zone.
 *
 * Call the real zone_get_id() in libzonecfg.so.1 if it can be found.
 * Otherwise, perform a stripped-down version of the function.
 * Any changes in one version should probably be reflected in the other.
 *
 * This stripped-down version of the function only checks for active
 * (booted) zones, by numeric id or name.
 */

typedef	int (*zone_get_id_t)(const char *, zoneid_t *);
static zone_get_id_t real_zone_get_id = NULL;

int
zone_get_id(const char *str, zoneid_t *zip)
{
	zoneid_t zoneid;
	char *cp;

	/*
	 * The first time we are called, attempt to dlopen() libzonecfg.so.1
	 * and get a pointer to the real zone_get_id().
	 * If we fail, set our pointer to -1 so we won't try again.
	 */
	if (real_zone_get_id == NULL) {
		/*
		 * There's no harm in doing this more than once, even
		 * concurrently.  We will get the same result each time,
		 * and the dynamic linker will single-thread the dlopen()
		 * with its own internal lock.  The worst that can happen
		 * is that the handle gets a reference count greater than
		 * one, which doesn't matter since we never dlclose()
		 * the handle if we successfully find the symbol; the
		 * library just stays in the address space until exit().
		 */
		void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY);
		void *sym = (void *)(-1);

		if (dlhandle != NULL &&
		    (sym = dlsym(dlhandle, "zone_get_id")) == NULL) {
			sym = (void *)(-1);
			(void) dlclose(dlhandle);
		}
		real_zone_get_id = (zone_get_id_t)sym;
	}

	/*
	 * If we've successfully loaded it, call the real zone_get_id().
	 * Otherwise, perform our stripped-down version of the code.
	 */
	if (real_zone_get_id != (zone_get_id_t)(-1))
		return (real_zone_get_id(str, zip));

	/* first try looking for active zone by id */
	errno = 0;
	zoneid = (zoneid_t)strtol(str, &cp, 0);
	if (errno == 0 && cp != str && *cp == '\0' &&
	    getzonenamebyid(zoneid, NULL, 0) != -1) {
		*zip = zoneid;
		return (0);
	}

	/* then look for active zone by name */
	if ((zoneid = getzoneidbyname(str)) != -1) {
		*zip = zoneid;
		return (0);
	}

	/* not an active zone, return error */
	return (-1);
}

int
zone_list(zoneid_t *zonelist, uint_t *numzones)
{
	return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones));
}

/*
 * Underlying implementation for getzoneid and getzoneidbyname.
 */
static zoneid_t
zone_lookup(const char *name)
{
	return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name));
}

zoneid_t
getzoneid(void)
{
	return (zone_lookup(NULL));
}

zoneid_t
getzoneidbyname(const char *zonename)
{
	return (zone_lookup(zonename));
}

ssize_t
getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen)
{
	return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen));
}