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/param.h> 30 #include <sys/types.h> 31 #include <sys/jail.h> 32 #include <sys/uio.h> 33 34 #include <errno.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 39 #include "jail.h" 40 41 42 /* 43 * Return the JID corresponding to a jail name. 44 */ 45 int 46 jail_getid(const char *name) 47 { 48 char *ep; 49 int jid; 50 struct iovec jiov[4]; 51 52 jid = strtoul(name, &ep, 10); 53 if (*name && !*ep) { 54 /* 55 * jid == 0 is a special case; it will not appear in the 56 * kernel's jail list, but naturally processes will be assigned 57 * to it because it is prison 0. Trivially return this one 58 * without a trip to the kernel, because it always exists but 59 * the lookup won't succeed. 60 */ 61 if (jid == 0) 62 return jid; 63 jiov[0].iov_base = __DECONST(char *, "jid"); 64 jiov[0].iov_len = sizeof("jid"); 65 jiov[1].iov_base = &jid; 66 jiov[1].iov_len = sizeof(jid); 67 } else { 68 jiov[0].iov_base = __DECONST(char *, "name"); 69 jiov[0].iov_len = sizeof("name"); 70 jiov[1].iov_len = strlen(name) + 1; 71 jiov[1].iov_base = alloca(jiov[1].iov_len); 72 strcpy(jiov[1].iov_base, name); 73 } 74 jiov[2].iov_base = __DECONST(char *, "errmsg"); 75 jiov[2].iov_len = sizeof("errmsg"); 76 jiov[3].iov_base = jail_errmsg; 77 jiov[3].iov_len = JAIL_ERRMSGLEN; 78 jail_errmsg[0] = 0; 79 jid = jail_get(jiov, 4, 0); 80 if (jid < 0 && !jail_errmsg[0]) 81 snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s", 82 strerror(errno)); 83 return jid; 84 } 85 86 /* 87 * Return the name corresponding to a JID. 88 */ 89 char * 90 jail_getname(int jid) 91 { 92 struct iovec jiov[6]; 93 char *name; 94 char namebuf[MAXHOSTNAMELEN]; 95 96 jiov[0].iov_base = __DECONST(char *, "jid"); 97 jiov[0].iov_len = sizeof("jid"); 98 jiov[1].iov_base = &jid; 99 jiov[1].iov_len = sizeof(jid); 100 jiov[2].iov_base = __DECONST(char *, "name"); 101 jiov[2].iov_len = sizeof("name"); 102 jiov[3].iov_base = namebuf; 103 jiov[3].iov_len = sizeof(namebuf); 104 jiov[4].iov_base = __DECONST(char *, "errmsg"); 105 jiov[4].iov_len = sizeof("errmsg"); 106 jiov[5].iov_base = jail_errmsg; 107 jiov[5].iov_len = JAIL_ERRMSGLEN; 108 jail_errmsg[0] = 0; 109 jid = jail_get(jiov, 6, 0); 110 if (jid < 0) { 111 if (!jail_errmsg[0]) 112 snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s", 113 strerror(errno)); 114 return NULL; 115 } else { 116 name = strdup(namebuf); 117 if (name == NULL) 118 strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN); 119 } 120 return name; 121 } 122