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/*
23 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26/*
27 *	nis/getnetent.c -- "nis" backend for nsswitch "networks" database
28 */
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include "nis_common.h"
33#include <synch.h>
34#include <netdb.h>
35#include <sys/socket.h>
36#include <netinet/in.h>
37#include <arpa/inet.h>
38#include <string.h>
39
40static int nettoa(int anet, char *buf, int buflen, char **pnull);
41
42static nss_status_t
43getbyname(be, a)
44	nis_backend_ptr_t	be;
45	void			*a;
46{
47	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
48
49	return (_nss_nis_lookup(be, argp, 1, "networks.byname",
50		argp->key.name, 0));
51}
52
53static nss_status_t
54getbyaddr(be, a)
55	nis_backend_ptr_t	be;
56	void			*a;
57{
58	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
59	char			addrstr[16];
60	char			*pnull;
61	nss_status_t		rc;
62
63	if (nettoa((int)argp->key.netaddr.net, addrstr, 16, &pnull) != 0)
64		return (NSS_UNAVAIL);	/* it's really ENOMEM */
65	rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr", addrstr, 0);
66
67	/*
68	 * if not found, try again with the untruncated address string
69	 * that has the trailing zero(s)
70	 */
71	if (rc == NSS_NOTFOUND && pnull != NULL) {
72		*pnull = '.';
73		rc = _nss_nis_lookup(be, argp, 1, "networks.byaddr",
74			addrstr, 0);
75	}
76	return (rc);
77}
78
79static nis_backend_op_t net_ops[] = {
80	_nss_nis_destr,
81	_nss_nis_endent,
82	_nss_nis_setent,
83	_nss_nis_getent_netdb,
84	getbyname,
85	getbyaddr
86};
87
88/*ARGSUSED*/
89nss_backend_t *
90_nss_nis_networks_constr(dummy1, dummy2, dummy3)
91	const char	*dummy1, *dummy2, *dummy3;
92{
93	return (_nss_nis_constr(net_ops,
94				sizeof (net_ops) / sizeof (net_ops[0]),
95				"networks.byaddr"));
96}
97
98/*
99 * Takes an unsigned integer in host order, and returns a printable
100 * string for it as a network number.  To allow for the possibility of
101 * naming subnets, only trailing dot-zeros are truncated. The location
102 * where the string is truncated (or set to '\0') is returned in *pnull.
103 */
104static int
105nettoa(int anet, char *buf, int buflen, char **pnull)
106{
107	char *p;
108	struct in_addr in;
109	int addr;
110
111	*pnull = NULL;
112
113	if (buf == 0)
114		return (1);
115	in = inet_makeaddr(anet, INADDR_ANY);
116	addr = in.s_addr;
117	(void) strncpy(buf, inet_ntoa(in), buflen);
118	if ((IN_CLASSA_HOST & htonl(addr)) == 0) {
119		p = strchr(buf, '.');
120		if (p == NULL)
121			return (1);
122		*p = 0;
123		*pnull = p;
124	} else if ((IN_CLASSB_HOST & htonl(addr)) == 0) {
125		p = strchr(buf, '.');
126		if (p == NULL)
127			return (1);
128		p = strchr(p+1, '.');
129		if (p == NULL)
130			return (1);
131		*p = 0;
132		*pnull = p;
133	} else if ((IN_CLASSC_HOST & htonl(addr)) == 0) {
134		p = strrchr(buf, '.');
135		if (p == NULL)
136			return (1);
137		*p = 0;
138		*pnull = p;
139	}
140	return (0);
141}
142