usr/src/lib/libc/port/sys/zone.c

   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 /*
  23  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #include "lint.h"
  28 #include <sys/types.h>
  29 #include <sys/syscall.h>
  30 #include <sys/zone.h>
  31 #include <sys/priv.h>
  32 #include <priv_private.h>
  33 #include <zone.h>
  34 #include <dlfcn.h>
  35 #include <stdlib.h>
  36 #include <errno.h>
  37
  38 zoneid_t
  39 zone_create(const char *name, const char *root, const struct priv_set *privs,
  40     const char *rctls, size_t rctlsz, const char *zfs, size_t zfssz,
  41     int *extended_error, int flags)
  42 {
  43         zone_def  zd;
  44         priv_data_t *d;
  45
  46         LOADPRIVDATA(d);
  47
  48         zd.zone_name = name;
  49         zd.zone_root = root;
  50         zd.zone_privs = privs;
  51         zd.zone_privssz = d->pd_setsize;
  52         zd.rctlbuf = rctls;
  53         zd.rctlbufsz = rctlsz;
  54         zd.zfsbuf = zfs;
  55         zd.zfsbufsz = zfssz;
  56         zd.extended_error = extended_error;
  57         zd.flags = flags;
  58
  59         return ((zoneid_t)syscall(SYS_zone, ZONE_CREATE, &zd));
  60 }
  61
  62 int
  63 zone_boot(zoneid_t zoneid)
  64 {
  65         return (syscall(SYS_zone, ZONE_BOOT, zoneid));
  66 }
  67
  68 int
  69 zone_shutdown(zoneid_t zoneid)
  70 {
  71         return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid));
  72 }
  73
  74 int
  75 zone_destroy(zoneid_t zoneid)
  76 {
  77         return (syscall(SYS_zone, ZONE_DESTROY, zoneid));
  78 }
  79
  80 ssize_t
  81 zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size)
  82 {
  83         sysret_t rval;
  84         int error;
  85
  86         error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid,
  87             attr, valp, size);
  88         if (error)
  89                 (void) __set_errno(error);
  90         return ((ssize_t)rval.sys_rval1);
  91 }
  92
  93 int
  94 zone_setattr(zoneid_t zoneid, int attr, void *valp, size_t size)
  95 {
  96         return (syscall(SYS_zone, ZONE_SETATTR, zoneid, attr, valp, size));
  97 }
  98
  99 int
 100 zone_enter(zoneid_t zoneid)
 101 {
 102         return (syscall(SYS_zone, ZONE_ENTER, zoneid));
 103 }
 104
 105 /*
 106  * Get id (if any) for specified zone.
 107  *
 108  * Call the real zone_get_id() in libzonecfg.so.1 if it can be found.
 109  * Otherwise, perform a stripped-down version of the function.
 110  * Any changes in one version should probably be reflected in the other.
 111  *
 112  * This stripped-down version of the function only checks for active
 113  * (booted) zones, by numeric id or name.
 114  */
 115
 116 typedef int (*zone_get_id_t)(const char *, zoneid_t *);
 117 static zone_get_id_t real_zone_get_id = NULL;
 118
 119 int
 120 zone_get_id(const char *str, zoneid_t *zip)
 121 {
 122         zoneid_t zoneid;
 123         char *cp;
 124
 125         /*
 126          * The first time we are called, attempt to dlopen() libzonecfg.so.1
 127          * and get a pointer to the real zone_get_id().
 128          * If we fail, set our pointer to -1 so we won't try again.
 129          */
 130         if (real_zone_get_id == NULL) {
 131                 /*
 132                  * There's no harm in doing this more than once, even
 133                  * concurrently.  We will get the same result each time,
 134                  * and the dynamic linker will single-thread the dlopen()
 135                  * with its own internal lock.  The worst that can happen
 136                  * is that the handle gets a reference count greater than
 137                  * one, which doesn't matter since we never dlclose()
 138                  * the handle if we successfully find the symbol; the
 139                  * library just stays in the address space until exit().
 140                  */
 141                 void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY);
 142                 void *sym = (void *)(-1);
 143
 144                 if (dlhandle != NULL &&
 145                     (sym = dlsym(dlhandle, "zone_get_id")) == NULL) {
 146                         sym = (void *)(-1);
 147                         (void) dlclose(dlhandle);
 148                 }
 149                 real_zone_get_id = (zone_get_id_t)sym;
 150         }
 151
 152         /*
 153          * If we've successfully loaded it, call the real zone_get_id().
 154          * Otherwise, perform our stripped-down version of the code.
 155          */
 156         if (real_zone_get_id != (zone_get_id_t)(-1))
 157                 return (real_zone_get_id(str, zip));
 158
 159         /* first try looking for active zone by id */
 160         errno = 0;
 161         zoneid = (zoneid_t)strtol(str, &cp, 0);
 162         if (errno == 0 && cp != str && *cp == '\0' &&
 163             getzonenamebyid(zoneid, NULL, 0) != -1) {
 164                 *zip = zoneid;
 165                 return (0);
 166         }
 167
 168         /* then look for active zone by name */
 169         if ((zoneid = getzoneidbyname(str)) != -1) {
 170                 *zip = zoneid;
 171                 return (0);
 172         }
 173
 174         /* not an active zone, return error */
 175         return (-1);
 176 }
 177
 178 int
 179 zone_list(zoneid_t *zonelist, uint_t *numzones)
 180 {
 181         return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones));
 182 }
 183
 184 /*
 185  * Underlying implementation for getzoneid and getzoneidbyname.
 186  */
 187 static zoneid_t
 188 zone_lookup(const char *name)
 189 {
 190         return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name));
 191 }
 192
 193 zoneid_t
 194 getzoneid(void)
 195 {
 196         return (zone_lookup(NULL));
 197 }
 198
 199 zoneid_t
 200 getzoneidbyname(const char *zonename)
 201 {
 202         return (zone_lookup(zonename));
 203 }
 204
 205 ssize_t
 206 getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen)
 207 {
 208         return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen));
 209 }
 210
 211 int
 212 zone_version(int *version)
 213 {
 214         return (syscall(SYS_zone, ZONE_VERSION, version));
 215 }
 216
 217 int
 218 zone_add_datalink(zoneid_t zoneid, datalink_id_t linkid)
 219 {
 220         return (syscall(SYS_zone, ZONE_ADD_DATALINK, zoneid, linkid));
 221 }
 222
 223 int
 224 zone_remove_datalink(zoneid_t zoneid, datalink_id_t linkid)
 225 {
 226         return (syscall(SYS_zone, ZONE_DEL_DATALINK, zoneid, linkid));
 227 }
 228
 229 int
 230 zone_check_datalink(zoneid_t *zoneidp, datalink_id_t linkid)
 231 {
 232         return (syscall(SYS_zone, ZONE_CHECK_DATALINK, zoneidp, linkid));
 233 }
 234
 235 int
 236 zone_list_datalink(zoneid_t zoneid, int *dlnump, datalink_id_t *linkids)
 237 {
 238         return (syscall(SYS_zone, ZONE_LIST_DATALINK, zoneid, dlnump, linkids));
 239 }