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 <zone.h> 39 #include <dlfcn.h> 40 #include <stdlib.h> 41 #include <errno.h> 42 43 zoneid_t 44 zone_create(const char *name, const char *root, const priv_set_t *privs, 45 const char *rctls, size_t rctlsz, int *extended_error) 46 { 47 zone_def zd; 48 49 zd.zone_name = name; 50 zd.zone_root = root; 51 zd.zone_privs = privs; 52 zd.rctlbuf = rctls; 53 zd.rctlbufsz = rctlsz; 54 zd.extended_error = extended_error; 55 56 return ((zoneid_t)syscall(SYS_zone, 57 ZONE_CREATE, &zd)); 58 } 59 60 int 61 zone_boot(zoneid_t zoneid, const char *bootargs) 62 { 63 return (syscall(SYS_zone, ZONE_BOOT, zoneid, bootargs)); 64 } 65 66 int 67 zone_shutdown(zoneid_t zoneid) 68 { 69 return (syscall(SYS_zone, ZONE_SHUTDOWN, zoneid)); 70 } 71 72 int 73 zone_destroy(zoneid_t zoneid) 74 { 75 return (syscall(SYS_zone, ZONE_DESTROY, zoneid)); 76 } 77 78 ssize_t 79 zone_getattr(zoneid_t zoneid, int attr, void *valp, size_t size) 80 { 81 sysret_t rval; 82 int error; 83 84 error = __systemcall(&rval, SYS_zone, ZONE_GETATTR, zoneid, 85 attr, valp, size); 86 if (error) 87 (void) __set_errno(error); 88 return ((ssize_t)rval.sys_rval1); 89 } 90 91 int 92 zone_enter(zoneid_t zoneid) 93 { 94 return (syscall(SYS_zone, ZONE_ENTER, zoneid)); 95 } 96 97 /* 98 * Get id (if any) for specified zone. 99 * 100 * Call the real zone_get_id() in libzonecfg.so.1 if it can be found. 101 * Otherwise, perform a stripped-down version of the function. 102 * Any changes in one version should probably be reflected in the other. 103 * 104 * This stripped-down version of the function only checks for active 105 * (booted) zones, by numeric id or name. 106 */ 107 108 typedef int (*zone_get_id_t)(const char *, zoneid_t *); 109 static zone_get_id_t real_zone_get_id = NULL; 110 111 int 112 zone_get_id(const char *str, zoneid_t *zip) 113 { 114 zoneid_t zoneid; 115 char *cp; 116 117 /* 118 * The first time we are called, attempt to dlopen() libzonecfg.so.1 119 * and get a pointer to the real zone_get_id(). 120 * If we fail, set our pointer to -1 so we won't try again. 121 */ 122 if (real_zone_get_id == NULL) { 123 /* 124 * There's no harm in doing this more than once, even 125 * concurrently. We will get the same result each time, 126 * and the dynamic linker will single-thread the dlopen() 127 * with its own internal lock. The worst that can happen 128 * is that the handle gets a reference count greater than 129 * one, which doesn't matter since we never dlclose() 130 * the handle if we successfully find the symbol; the 131 * library just stays in the address space until exit(). 132 */ 133 void *dlhandle = dlopen("libzonecfg.so.1", RTLD_LAZY); 134 void *sym = (void *)(-1); 135 136 if (dlhandle != NULL && 137 (sym = dlsym(dlhandle, "zone_get_id")) == NULL) { 138 sym = (void *)(-1); 139 (void) dlclose(dlhandle); 140 } 141 real_zone_get_id = (zone_get_id_t)sym; 142 } 143 144 /* 145 * If we've successfully loaded it, call the real zone_get_id(). 146 * Otherwise, perform our stripped-down version of the code. 147 */ 148 if (real_zone_get_id != (zone_get_id_t)(-1)) 149 return (real_zone_get_id(str, zip)); 150 151 /* first try looking for active zone by id */ 152 errno = 0; 153 zoneid = (zoneid_t)strtol(str, &cp, 0); 154 if (errno == 0 && cp != str && *cp == '\0' && 155 getzonenamebyid(zoneid, NULL, 0) != -1) { 156 *zip = zoneid; 157 return (0); 158 } 159 160 /* then look for active zone by name */ 161 if ((zoneid = getzoneidbyname(str)) != -1) { 162 *zip = zoneid; 163 return (0); 164 } 165 166 /* not an active zone, return error */ 167 return (-1); 168 } 169 170 int 171 zone_list(zoneid_t *zonelist, uint_t *numzones) 172 { 173 return (syscall(SYS_zone, ZONE_LIST, zonelist, numzones)); 174 } 175 176 /* 177 * Underlying implementation for getzoneid and getzoneidbyname. 178 */ 179 static zoneid_t 180 zone_lookup(const char *name) 181 { 182 return ((zoneid_t)syscall(SYS_zone, ZONE_LOOKUP, name)); 183 } 184 185 zoneid_t 186 getzoneid(void) 187 { 188 return (zone_lookup(NULL)); 189 } 190 191 zoneid_t 192 getzoneidbyname(const char *zonename) 193 { 194 return (zone_lookup(zonename)); 195 } 196 197 ssize_t 198 getzonenamebyid(zoneid_t zoneid, char *buf, size_t buflen) 199 { 200 return (zone_getattr(zoneid, ZONE_ATTR_NAME, buf, buflen)); 201 } 202