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 * files/ether_addr.c -- "files" backend for nsswitch "ethers" database
23 *
24 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
25 * Use is subject to license terms.
26 */
27
28#pragma ident	"%Z%%M%	%I%	%E% SMI"
29
30/*
31 * All routines necessary to deal with the file /etc/ethers.  The file
32 * contains mappings from 48 bit ethernet addresses to their corresponding
33 * hosts names.  The addresses have an ascii representation of the form
34 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff;  the
35 * bytes are always in network order.
36 */
37
38#include <sys/types.h>
39#include <sys/socket.h>
40#include <net/if.h>
41#include <netinet/in.h>
42#include <netinet/if_ether.h>
43#include <nss_dbdefs.h>
44#include "files_common.h"
45#include <strings.h>
46#include <ctype.h>
47
48#define	_PATH_ETHERS	"/etc/ethers"
49#define	DIGIT(x)	\
50	(isdigit(x) ? (x) - '0' : islower(x) ? (x) + 10 - 'a' : (x) + 10 - 'A')
51
52static int
53check_host(nss_XbyY_args_t *argp, const char *line, int linelen)
54{
55	const char	*limit, *linep, *keyp;
56	linep = line;
57	limit = line + linelen;
58
59	/* skip leading spaces */
60	while (linep < limit && isspace(*linep))
61		linep++;
62	/* skip mac address */
63	while (linep < limit && !isspace(*linep))
64		linep++;
65	/* skip the delimiting spaces */
66	while (linep < limit && isspace(*linep))
67		linep++;
68	if (linep == limit)
69		return (0);
70
71	/* compare the host name */
72	keyp = argp->key.name;
73	while (*keyp != '\0' && linep < limit && *keyp == *linep) {
74		keyp++;
75		linep++;
76	}
77	return (*keyp == '\0' && linep == limit);
78}
79
80static nss_status_t
81getbyhost(be, a)
82	files_backend_ptr_t	be;
83	void			*a;
84{
85	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
86	char	hostname[MAXHOSTNAMELEN];
87	nss_status_t		res;
88
89	/*
90	 * use the buffer passed in if result is to be returned
91	 * in /etc file format
92	 */
93	if (argp->buf.result != NULL) {
94		argp->buf.buffer = hostname;
95		argp->buf.buflen = MAXHOSTNAMELEN;
96	}
97
98	res = _nss_files_XY_all(be, argp, 0, argp->key.name, check_host);
99
100	if (argp->buf.result != NULL) {
101		argp->buf.buffer = NULL;
102		argp->buf.buflen = 0;
103	}
104
105	return (res);
106}
107
108static int
109check_ether(nss_XbyY_args_t *argp, const char *line, int linelen)
110{
111
112	const char	*limit, *linep;
113	uchar_t		ether[6];
114	ptrdiff_t	i;
115	int		n;
116
117	linep = line;
118	limit = line + linelen;
119
120	/* skip leading spaces */
121	while (linep < limit && isspace(*linep))
122		linep++;
123
124	for (i = 0; i < 6; i++) {
125		n = 0;
126		while (linep < limit && isxdigit(*linep)) {
127			n = 16 * n + DIGIT(*linep);
128			linep++;
129		}
130		if (*linep != ':' && i < 5) {
131			return (0);
132		} else if (*linep == ':' && i == 5) {
133			return (0);
134		} else {
135			linep++;
136			ether[i] = (uchar_t)n;
137		}
138	}
139	return (ether_cmp((void *)ether, (void *)argp->key.ether) == 0);
140}
141
142static nss_status_t
143getbyether(be, a)
144	files_backend_ptr_t	be;
145	void			*a;
146{
147	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
148	struct ether_addr	etheraddr;
149	nss_status_t		res;
150
151	argp->buf.result	= &etheraddr;
152
153	res = _nss_files_XY_all(be, argp, 0, NULL, check_ether);
154
155	argp->buf.result	= NULL;
156	return (res);
157}
158
159static files_backend_op_t ethers_ops[] = {
160	_nss_files_destr,
161	getbyhost,
162	getbyether
163};
164
165/*ARGSUSED*/
166nss_backend_t *
167_nss_files_ethers_constr(dummy1, dummy2, dummy3)
168	const char	*dummy1, *dummy2, *dummy3;
169{
170	return (_nss_files_constr(ethers_ops,
171				sizeof (ethers_ops) / sizeof (ethers_ops[0]),
172				_PATH_ETHERS,
173				NSS_LINELEN_ETHERS,
174				NULL));
175}
176