3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Bill Paul.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * ethernet address conversion and lookup routines
34 * Written by Bill Paul <wpaul@ctr.columbia.edu>
35 * Center for Telecommunications Research
36 * Columbia University, New York City
38 * $FreeBSD: src/lib/libc/net/ether_addr.c,v 1.10.2.5 2002/04/08 08:01:50 ru Exp $
39 * $DragonFly: src/lib/libc/net/ether_addr.c,v 1.4 2005/11/13 02:04:47 swildner Exp $
44 #include <sys/types.h>
47 #include <sys/param.h>
48 #include <sys/socket.h>
49 #include <net/ethernet.h>
52 #include <rpcsvc/yp_prot.h>
53 #include <rpcsvc/ypclnt.h>
57 #define _PATH_ETHERS "/etc/ethers"
61 * Parse a string of text containing an ethernet address and hostname
62 * and separate it into its component parts.
65 ether_line(const char *l
, struct ether_addr
*e
, char *hostname
)
69 i
= sscanf(l
, "%x:%x:%x:%x:%x:%x %s", &o
[0], &o
[1], &o
[2],
81 * Convert an ASCII representation of an ethernet address to
85 ether_aton(const char *a
)
88 static struct ether_addr o
;
89 unsigned int o0
, o1
, o2
, o3
, o4
, o5
;
91 i
= sscanf(a
, "%x:%x:%x:%x:%x:%x", &o0
, &o1
, &o2
, &o3
, &o4
, &o5
);
103 return ((struct ether_addr
*)&o
);
107 * Convert a binary representation of an ethernet address to
111 ether_ntoa(const struct ether_addr
*n
)
116 i
= sprintf(a
, "%02x:%02x:%02x:%02x:%02x:%02x",
117 n
->octet
[0], n
->octet
[1], n
->octet
[2],
118 n
->octet
[3], n
->octet
[4], n
->octet
[5]);
125 * Map an ethernet address to a hostname. Use either /etc/ethers or
129 ether_ntohost(char *hostname
, const struct ether_addr
*e
)
132 char buf
[BUFSIZ
+ 2];
133 struct ether_addr local_ether
;
134 char local_host
[MAXHOSTNAMELEN
];
141 if ((fp
= fopen(_PATH_ETHERS
, "r")) == NULL
)
144 while (fgets(buf
,BUFSIZ
,fp
)) {
149 if (yp_get_default_domain(&yp_domain
))
151 ether_a
= ether_ntoa(e
);
152 if (yp_match(yp_domain
, "ethers.byaddr", ether_a
,
153 strlen(ether_a
), &result
, &resultlen
)) {
156 strncpy(buf
, result
, resultlen
);
157 buf
[resultlen
] = '\0';
161 if (!ether_line(buf
, &local_ether
, local_host
)) {
162 if (!bcmp((char *)&local_ether
.octet
[0],
163 (char *)&e
->octet
[0], 6)) {
164 /* We have a match */
165 strcpy(hostname
, local_host
);
176 * Map a hostname to an ethernet address using /etc/ethers or
180 ether_hostton(const char *hostname
, struct ether_addr
*e
)
183 char buf
[BUFSIZ
+ 2];
184 struct ether_addr local_ether
;
185 char local_host
[MAXHOSTNAMELEN
];
191 if ((fp
= fopen(_PATH_ETHERS
, "r")) == NULL
)
194 while (fgets(buf
,BUFSIZ
,fp
)) {
199 if (yp_get_default_domain(&yp_domain
))
201 if (yp_match(yp_domain
, "ethers.byname", hostname
,
202 strlen(hostname
), &result
, &resultlen
)) {
205 strncpy(buf
, result
, resultlen
);
206 buf
[resultlen
] = '\0';
210 if (!ether_line(buf
, &local_ether
, local_host
)) {
211 if (!strcmp(hostname
, local_host
)) {
212 /* We have a match */
213 bcopy((char *)&local_ether
.octet
[0],
214 (char *)&e
->octet
[0], 6);