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 44 extern zoneid_t 45 zone_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 67 int 68 zone_boot(zoneid_t zoneid, const char *bootargs) 69 { 70 return (syscall(SYS_zone, ZONE_BOOT, zoneid, bootargs)); 71 } 72 73 int 74 zone_shutdown(zoneid_t zoneid) 75 { 76 return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid)); 77 } 78 79 int 80 zone_destroy(zoneid_t zoneid) 81 { 82 return (syscall(SYS_zone, ZONE_DESTROY, zoneid)); 83 } 84 85 ssize_t 86 zone_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 98 int 99 zone_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 */ 114 115 typedef int (*zone_get_id_t)(const char *, zoneid_t *); 116 static zone_get_id_t real_zone_get_id = NULL; 117 118 int 119 zone_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 } 176 177 int 178 zone_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 */ 186 static zoneid_t 187 zone_lookup(const char *name) 188 { 189 return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name)); 190 } 191 192 zoneid_t 193 getzoneid(void) 194 { 195 return (zone_lookup(NULL)); 196 } 197 198 zoneid_t 199 getzoneidbyname(const char *zonename) 200 { 201 return (zone_lookup(zonename)); 202 } 203 204 ssize_t 205 getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen) 206 { 207 return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen)); 208 } 209 210 int 211 zone_version(int *version) 212 { 213 return (syscall(SYS_zone, ZONE_VERSION, version)); 214 } 215