netname.c revision 261046 
1/*-
2 * Copyright (c) 2009, Sun Microsystems, Inc.
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 are met:
7 * - Redistributions of source code must retain the above copyright notice,
8 *   this list of conditions and the following disclaimer.
9 * - Redistributions in binary form must reproduce the above copyright notice,
10 *   this list of conditions and the following disclaimer in the documentation
11 *   and/or other materials provided with the distribution.
12 * - Neither the name of Sun Microsystems, Inc. nor the names of its
13 *   contributors may be used to endorse or promote products derived
14 *   from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND 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 COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#if defined(LIBC_SCCS) && !defined(lint)
30static char sccsid[] = "@(#)netname.c 1.8 91/03/11 Copyr 1986 Sun Micro";
31#endif
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/10/lib/libc/rpc/netname.c 261046 2014-01-22 23:45:27Z mav $");
34
35/*
36 * netname utility routines
37 * convert from unix names to network names and vice-versa
38 * This module is operating system dependent!
39 * What we define here will work with any unix system that has adopted
40 * the sun NIS domain architecture.
41 */
42
43#include "namespace.h"
44#include <sys/param.h>
45#include <rpc/rpc.h>
46#include <rpc/rpc_com.h>
47#ifdef YP
48#include <rpcsvc/yp_prot.h>
49#include <rpcsvc/ypclnt.h>
50#endif
51#include <ctype.h>
52#include <limits.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57#include "un-namespace.h"
58
59#ifndef MAXHOSTNAMELEN
60#define MAXHOSTNAMELEN 256
61#endif
62
63#define TYPE_BIT(type)  (sizeof (type) * CHAR_BIT)
64
65#define TYPE_SIGNED(type) (((type) -1) < 0)
66
67/*
68** 302 / 1000 is log10(2.0) rounded up.
69** Subtract one for the sign bit if the type is signed;
70** add one for integer division truncation;
71** add one more for a minus sign if the type is signed.
72*/
73#define INT_STRLEN_MAXIMUM(type) \
74    ((TYPE_BIT(type) - TYPE_SIGNED(type)) * 302 / 1000 + 1 + TYPE_SIGNED(type))
75
76static char *OPSYS = "unix";
77
78/*
79 * Figure out my fully qualified network name
80 */
81int
82getnetname(name)
83	char name[MAXNETNAMELEN+1];
84{
85	uid_t uid;
86
87	uid = geteuid();
88	if (uid == 0) {
89		return (host2netname(name, (char *) NULL, (char *) NULL));
90	} else {
91		return (user2netname(name, uid, (char *) NULL));
92	}
93}
94
95
96/*
97 * Convert unix cred to network-name
98 */
99int
100user2netname(netname, uid, domain)
101	char netname[MAXNETNAMELEN + 1];
102	const uid_t uid;
103	const char *domain;
104{
105	char *dfltdom;
106
107	if (domain == NULL) {
108		if (__rpc_get_default_domain(&dfltdom) != 0) {
109			return (0);
110		}
111		domain = dfltdom;
112	}
113	if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
114		return (0);
115	}
116	(void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain);
117	return (1);
118}
119
120
121/*
122 * Convert host to network-name
123 */
124int
125host2netname(netname, host, domain)
126	char netname[MAXNETNAMELEN + 1];
127	const char *host;
128	const char *domain;
129{
130	char *dfltdom;
131	char hostname[MAXHOSTNAMELEN+1];
132
133	if (domain == NULL) {
134		if (__rpc_get_default_domain(&dfltdom) != 0) {
135			return (0);
136		}
137		domain = dfltdom;
138	}
139	if (host == NULL) {
140		(void) gethostname(hostname, sizeof(hostname));
141		host = hostname;
142	}
143	if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
144		return (0);
145	}
146	(void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain);
147	return (1);
148}
149