1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2009 James Gritton. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/types.h> 32 #include <sys/jail.h> 33 #include <sys/uio.h> 34 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 #include "jail.h" 41 42 43 /* 44 * Return the JID corresponding to a jail name. 45 */ 46 int 47 jail_getid(const char *name) 48 { 49 char *ep; 50 int jid; 51 struct iovec jiov[4]; 52 53 jid = strtoul(name, &ep, 10); 54 if (*name && !*ep) { 55 /* 56 * jid == 0 is a special case; it will not appear in the 57 * kernel's jail list, but naturally processes will be assigned 58 * to it because it is prison 0. Trivially return this one 59 * without a trip to the kernel, because it always exists but 60 * the lookup won't succeed. 61 */ 62 if (jid == 0) 63 return jid; 64 jiov[0].iov_base = __DECONST(char *, "jid"); 65 jiov[0].iov_len = sizeof("jid"); 66 jiov[1].iov_base = &jid; 67 jiov[1].iov_len = sizeof(jid); 68 } else { 69 jiov[0].iov_base = __DECONST(char *, "name"); 70 jiov[0].iov_len = sizeof("name"); 71 jiov[1].iov_len = strlen(name) + 1; 72 jiov[1].iov_base = alloca(jiov[1].iov_len); 73 strcpy(jiov[1].iov_base, name); 74 } 75 jiov[2].iov_base = __DECONST(char *, "errmsg"); 76 jiov[2].iov_len = sizeof("errmsg"); 77 jiov[3].iov_base = jail_errmsg; 78 jiov[3].iov_len = JAIL_ERRMSGLEN; 79 jail_errmsg[0] = 0; 80 jid = jail_get(jiov, 4, 0); 81 if (jid < 0 && !jail_errmsg[0]) 82 snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s", 83 strerror(errno)); 84 return jid; 85 } 86 87 /* 88 * Return the name corresponding to a JID. 89 */ 90 char * 91 jail_getname(int jid) 92 { 93 struct iovec jiov[6]; 94 char *name; 95 char namebuf[MAXHOSTNAMELEN]; 96 97 jiov[0].iov_base = __DECONST(char *, "jid"); 98 jiov[0].iov_len = sizeof("jid"); 99 jiov[1].iov_base = &jid; 100 jiov[1].iov_len = sizeof(jid); 101 jiov[2].iov_base = __DECONST(char *, "name"); 102 jiov[2].iov_len = sizeof("name"); 103 jiov[3].iov_base = namebuf; 104 jiov[3].iov_len = sizeof(namebuf); 105 jiov[4].iov_base = __DECONST(char *, "errmsg"); 106 jiov[4].iov_len = sizeof("errmsg"); 107 jiov[5].iov_base = jail_errmsg; 108 jiov[5].iov_len = JAIL_ERRMSGLEN; 109 jail_errmsg[0] = 0; 110 jid = jail_get(jiov, 6, 0); 111 if (jid < 0) { 112 if (!jail_errmsg[0]) 113 snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s", 114 strerror(errno)); 115 return NULL; 116 } else { 117 name = strdup(namebuf); 118 if (name == NULL) 119 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 120 } 121 return name; 122 } 123