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