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