1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user or with the express written consent of
8 * Sun Microsystems, Inc.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California  94043
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(name)
85	char name[MAXNETNAMELEN+1];
86{
87	uid_t uid;
88
89	uid = geteuid();
90	if (uid == 0) {
91		return (host2netname(name, (char *) NULL, (char *) NULL));
92	} else {
93		return (user2netname(name, uid, (char *) NULL));
94	}
95}
96
97
98/*
99 * Convert unix cred to network-name
100 */
101int
102user2netname(netname, uid, domain)
103	char netname[MAXNETNAMELEN + 1];
104	const uid_t uid;
105	const char *domain;
106{
107	char *dfltdom;
108
109	if (domain == NULL) {
110		if (__rpc_get_default_domain(&dfltdom) != 0) {
111			return (0);
112		}
113		domain = dfltdom;
114	}
115	if (strlen(domain) + 1 + INT_STRLEN_MAXIMUM(u_long) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
116		return (0);
117	}
118	(void) sprintf(netname, "%s.%ld@%s", OPSYS, (u_long)uid, domain);
119	return (1);
120}
121
122
123/*
124 * Convert host to network-name
125 */
126int
127host2netname(netname, host, domain)
128	char netname[MAXNETNAMELEN + 1];
129	const char *host;
130	const char *domain;
131{
132	char *dfltdom;
133	char hostname[MAXHOSTNAMELEN+1];
134
135	if (domain == NULL) {
136		if (__rpc_get_default_domain(&dfltdom) != 0) {
137			return (0);
138		}
139		domain = dfltdom;
140	}
141	if (host == NULL) {
142		(void) gethostname(hostname, sizeof(hostname));
143		host = hostname;
144	}
145	if (strlen(domain) + 1 + strlen(host) + 1 + strlen(OPSYS) > MAXNETNAMELEN) {
146		return (0);
147	}
148	(void) sprintf(netname, "%s.%s@%s", OPSYS, host, domain);
149	return (1);
150}
151