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 2007 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 *
25 * files/netmasks.c -- "files" backend for nsswitch "netmasks" database
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30/*
31 * All routines necessary to deal with the file /etc/inet/netmasks.  The file
32 * contains mappings from 32 bit network internet addresses to their
33 * corresponding 32 bit mask internet addresses. The addresses are in dotted
34 * internet address form.
35 */
36
37#include "files_common.h"
38#include <string.h>
39#include <sys/types.h>
40#include <sys/socket.h>
41#include <net/if.h>
42#include <netinet/in.h>
43#include <arpa/inet.h>
44#include <nss_dbdefs.h>
45#include <ctype.h>
46
47/*
48 * Validate 'files' netmasks entry. The comparison objects are in IPv4
49 * internet address format.
50 */
51static int
52check_addr(nss_XbyY_args_t *argp, const char *line, int linelen)
53{
54	const char	*limit, *linep, *addrstart;
55	int		addrlen;
56	char		addrbuf[NSS_LINELEN_NETMASKS];
57	struct in_addr	lineaddr, argsaddr;
58
59	linep = line;
60	limit = line + linelen;
61
62	/* skip leading spaces */
63	while (linep < limit && isspace(*linep))
64		linep++;
65
66	addrstart = linep;
67	while (linep < limit && !isspace(*linep))
68		linep++;
69	if (linep == limit)
70		return (0);
71	addrlen = linep - addrstart;
72	if (addrlen < sizeof (addrbuf)) {
73		(void) memcpy(addrbuf, addrstart, addrlen);
74		addrbuf[addrlen] = '\0';
75		if ((lineaddr.s_addr = inet_addr(addrbuf)) ==
76						(in_addr_t)0xffffffffU)
77			return (0);
78		if ((argsaddr.s_addr = inet_addr(argp->key.name))
79				== (in_addr_t)0xffffffffU)
80			return (0);
81		return (lineaddr.s_addr == argsaddr.s_addr);
82	}
83	return (0);
84}
85
86static nss_status_t
87getbynet(be, a)
88	files_backend_ptr_t	be;
89	void			*a;
90{
91	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
92	nss_status_t		res;
93	char			tmpbuf[NSS_LINELEN_NETMASKS];
94
95	/*
96	 * use the buffer passed in if result is to be returned
97	 * in /etc file format
98	 */
99	if (argp->buf.result != NULL) {
100		argp->buf.buffer = tmpbuf;
101		argp->buf.buflen = NSS_LINELEN_NETMASKS;
102	}
103	res = _nss_files_XY_all(be, argp, 1, argp->key.name, check_addr);
104	if (argp->buf.result != NULL) {
105		argp->buf.buffer = NULL;
106		argp->buf.buflen = 0;
107	} else {
108		/* the frontend expects the netmask data only */
109		if (res == NSS_SUCCESS)	 {
110			char	*m;
111			char	*s = (char *)argp->returnval;
112			int	l = 0;
113
114			m = s + argp->returnlen - 1;
115
116			/* skip trailing spaces */
117			while (s < m && isspace(*m))
118				m--;
119
120			for (; s <= m; m--) {
121				if (isspace(*m))
122					break;
123				l++;
124			}
125			m++;
126			(void) memmove(argp->returnval, m, l);
127			argp->returnlen = l;
128			*(s + l) = '\0';
129		}
130	}
131
132	return (res);
133}
134
135static files_backend_op_t netmasks_ops[] = {
136	_nss_files_destr,
137	getbynet
138};
139
140/*ARGSUSED*/
141nss_backend_t *
142_nss_files_netmasks_constr(dummy1, dummy2, dummy3)
143	const char	*dummy1, *dummy2, *dummy3;
144{
145	return (_nss_files_constr(netmasks_ops,
146	    sizeof (netmasks_ops) / sizeof (netmasks_ops[0]),
147	    _PATH_NETMASKS, NSS_LINELEN_NETMASKS, NULL));
148}
149