1/*-
2 * Copyright (c) 2009 James Gritton.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
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 */
46int
47jail_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		return jid;
56	*(const void **)&jiov[0].iov_base = "name";
57	jiov[0].iov_len = sizeof("name");
58	jiov[1].iov_len = strlen(name) + 1;
59	jiov[1].iov_base = alloca(jiov[1].iov_len);
60	strcpy(jiov[1].iov_base, name);
61	*(const void **)&jiov[2].iov_base = "errmsg";
62	jiov[2].iov_len = sizeof("errmsg");
63	jiov[3].iov_base = jail_errmsg;
64	jiov[3].iov_len = JAIL_ERRMSGLEN;
65	jail_errmsg[0] = 0;
66	jid = jail_get(jiov, 4, 0);
67	if (jid < 0 && !jail_errmsg[0])
68		snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s",
69		    strerror(errno));
70	return jid;
71}
72
73/*
74 * Return the name corresponding to a JID.
75 */
76char *
77jail_getname(int jid)
78{
79	struct iovec jiov[6];
80	char *name;
81	char namebuf[MAXHOSTNAMELEN];
82
83	*(const void **)&jiov[0].iov_base = "jid";
84	jiov[0].iov_len = sizeof("jid");
85	jiov[1].iov_base = &jid;
86	jiov[1].iov_len = sizeof(jid);
87	*(const void **)&jiov[2].iov_base = "name";
88	jiov[2].iov_len = sizeof("name");
89	jiov[3].iov_base = namebuf;
90	jiov[3].iov_len = sizeof(namebuf);
91	*(const void **)&jiov[4].iov_base = "errmsg";
92	jiov[4].iov_len = sizeof("errmsg");
93	jiov[5].iov_base = jail_errmsg;
94	jiov[5].iov_len = JAIL_ERRMSGLEN;
95	jail_errmsg[0] = 0;
96	jid = jail_get(jiov, 6, 0);
97	if (jid < 0) {
98		if (!jail_errmsg[0])
99			snprintf(jail_errmsg, JAIL_ERRMSGLEN, "jail_get: %s",
100			    strerror(errno));
101		return NULL;
102	} else {
103		name = strdup(namebuf);
104		if (name == NULL)
105			strerror_r(errno, jail_errmsg, JAIL_ERRMSGLEN);
106	}
107	return name;
108}
109