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
jail_getid(const char * name)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 *
jail_getname(int jid)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