gethostent.c revision 2830:5228d1267a01 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 *
25 *	nis/gethostent.c -- "nis" backend for nsswitch "hosts" database
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30#include <ctype.h>
31#include <netdb.h>
32#include <stdio.h>
33#include <string.h>
34#include <netinet/in.h>
35#include <arpa/inet.h>
36#include <sys/socket.h>
37#include "nis_common.h"
38#include <stdlib.h>
39
40static nss_status_t
41getbyname(be, a)
42	nis_backend_ptr_t	be;
43	void			*a;
44{
45	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
46	nss_status_t	res;
47
48	const char		*s;
49	char			c;
50
51	for (s = argp->key.name;  (c = *s) != '\0';  s++) {
52		if (isupper(c)) {
53			char		*copy;
54			char		*mung;
55
56			if ((copy = strdup(argp->key.name)) == 0) {
57				return (NSS_UNAVAIL);
58			}
59			for (mung = copy + (s - argp->key.name);
60			    (c = *mung) != '\0';  mung++) {
61				if (isupper(c)) {
62					*mung = _tolower(c);
63				}
64			}
65			res = _nss_nis_lookup(be, argp, 1, "hosts.byname",
66				copy, 0);
67			free(copy);
68			argp->h_errno = __nss2herrno(res);
69			return (res);
70		}
71	}
72	res = _nss_nis_lookup(be, argp, 1,
73				"hosts.byname", argp->key.name, 0);
74	if (res != NSS_SUCCESS)
75		argp->h_errno = __nss2herrno(res);
76	return (res);
77}
78
79static nss_status_t
80getbyaddr(be, a)
81	nis_backend_ptr_t	be;
82	void			*a;
83{
84	nss_XbyY_args_t		*argp	= (nss_XbyY_args_t *)a;
85	struct in_addr		addr;
86	char			buf[18];
87	nss_status_t	res;
88	extern char	*inet_ntoa_r(); /* not an advertised function from */
89					/* libnsl (no man page), so no */
90					/* prototype. */
91
92	/* === Do we really want to be this pedantic? */
93	if (argp->key.hostaddr.type != AF_INET ||
94	    argp->key.hostaddr.len  != sizeof (addr)) {
95		return (NSS_NOTFOUND);
96	}
97	(void) memcpy(&addr, argp->key.hostaddr.addr, sizeof (addr));
98	res = _nss_nis_lookup(be, argp, 1, "hosts.byaddr",
99				inet_ntoa_r(addr, buf), 0);
100	if (res != NSS_SUCCESS)
101		argp->h_errno = __nss2herrno(res);
102	return (res);
103}
104
105
106static nis_backend_op_t host_ops[] = {
107	_nss_nis_destr,
108	_nss_nis_endent,
109	_nss_nis_setent,
110	_nss_nis_getent_netdb,
111	getbyname,
112	getbyaddr
113};
114
115/*ARGSUSED*/
116nss_backend_t *
117_nss_nis_hosts_constr(dummy1, dummy2, dummy3)
118	const char	*dummy1, *dummy2, *dummy3;
119{
120	return (_nss_nis_constr(host_ops,
121				sizeof (host_ops) / sizeof (host_ops[0]),
122				"hosts.byaddr"));
123}
124