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
52 static int
check_host(nss_XbyY_args_t * argp,const char * line,int linelen)53 check_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
80 static nss_status_t
getbyhost(be,a)81 getbyhost(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
108 static int
check_ether(nss_XbyY_args_t * argp,const char * line,int linelen)109 check_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
142 static nss_status_t
getbyether(be,a)143 getbyether(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 = ðeraddr;
152
153 res = _nss_files_XY_all(be, argp, 0, NULL, check_ether);
154
155 argp->buf.result = NULL;
156 return (res);
157 }
158
159 static files_backend_op_t ethers_ops[] = {
160 _nss_files_destr,
161 getbyhost,
162 getbyether
163 };
164
165 /*ARGSUSED*/
166 nss_backend_t *
_nss_files_ethers_constr(dummy1,dummy2,dummy3)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