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 */
45int
46jail_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 */
89char *
90jail_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