1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
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 are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char sccsid[] = "@(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro";
33#endif
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37/*
38 * netname utility routines
39 * convert from unix names to network names and vice-versa
40 * This module is operating system dependent!
41 * What we define here will work with any unix system that has adopted
42 * the sun NIS domain architecture.
43 */
44
45#include "namespace.h"
46#include <sys/param.h>
47#include <rpc/rpc.h>
48#include <rpc/rpc_com.h>
49#ifdef YP
50#include <rpcsvc/yp_prot.h>
51#include <rpcsvc/ypclnt.h>
52#endif
53#include <ctype.h>
54#include <limits.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <unistd.h>
59#include "un-namespace.h"
60
61#ifndef MAXHOSTNAMELEN
62#define MAXHOSTNAMELEN 256
63#endif
64
65#define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)
66
67#define TYPE_SIGNED(type) (((type) -1) < 0)
68
69/*
70** 302 / 1000 is log10(2.0) rounded up.
71** Subtract one for the sign bit if the type is signed;
72** add one for integer division truncation;
73** add one more for a minus sign if the type is signed.
74*/
75#define INT_STRLEN_MAXIMUM(type) \
76    ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))
77
78static char *OPSYS = "unix";
79
80/*
81 * Figure out my fully qualified network name
82 */
83int
84getnetname(char name[MAXNETNAMELEN+1])
85{
86	uid_t uid;
87
88	uid = geteuid();
89	if (uid == 0) {
90		return (host2netname(name, (char *) NULL, (char *) NULL));
91	} else {
92		return (user2netname(name, uid, (char *) NULL));
93	}
94}
95
96
97/*
98 * Convert unix cred to network-name
99 */
100int
101user2netname(char netname[MAXNETNAMELEN + 1], const uid_t uid, const char *domain)
102{
103	char *dfltdom;
104
105	if (domain == NULL) {
106		if (__rpc_get_default_domain(&dfltdom) != 0) {
107			return (0);
108		}
109		domain = dfltdom;
110	}
111	if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
112		return (0);
113	}
114	(void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain);
115	return (1);
116}
117
118
119/*
120 * Convert host to network-name
121 */
122int
123host2netname(char netname[MAXNETNAMELEN + 1], const char *host, const char *domain)
124{
125	char *dfltdom;
126	char hostname[MAXHOSTNAMELEN+1];
127
128	if (domain == NULL) {
129		if (__rpc_get_default_domain(&dfltdom) != 0) {
130			return (0);
131		}
132		domain = dfltdom;
133	}
134	if (host == NULL) {
135		(void) gethostname(hostname, sizeof(hostname));
136		host = hostname;
137	}
138	if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
139		return (0);
140	}
141	(void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain);
142	return (1);
143}
144