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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1990 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * All routines necessary to deal with the file /etc/ethers. The file
31 * contains mappings from 48 bit ethernet addresses to their corresponding
32 * hosts name. The addresses have an ascii representation of the form
33 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff; the
34 * bytes are always in network order.
35 */
36
37 #include <stdio.h>
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <net/if.h>
41 #include <netinet/in.h>
42 #include <net/if_arp.h>
43 #include <netinet/if_ether.h>
44
45 static char *domain; /* NIS domain name */
46 static int usingyellow;
47 static char *ethers = "/etc/ethers";
48
49 /*
50 * Parses a line from /etc/ethers into its components. The line has the form
51 * 8:0:20:1:17:c8 krypton
52 * where the first part is a 48 bit ethernet addrerss and the second is
53 * the corresponding hosts name.
54 * Returns zero if successful, non-zero otherwise.
55 *
56 * Arguments
57 * s: the string to be parsed
58 * e: ethernet address struct to be filled in
59 * hostname: hosts name to be set
60 */
61 int
ether_line(char * s,struct ether_addr * e,char * hostname)62 ether_line(char *s, struct ether_addr *e, char *hostname)
63 {
64 int i;
65 unsigned int t[6];
66
67 i = sscanf(s, " %x:%x:%x:%x:%x:%x %s",
68 &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname);
69 if (i != 7) {
70 return (7 - i);
71 }
72 for (i = 0; i < 6; i++)
73 e->ether_addr_octet[i] = t[i];
74 return (0);
75 }
76
77 /*
78 * Converts a 48 bit ethernet number to its string representation.
79 */
80 #define EI(i) (unsigned int)(e->ether_addr_octet[(i)])
81 char *
ether_ntoa(struct ether_addr * e)82 ether_ntoa(struct ether_addr *e)
83 {
84 static char *s;
85
86 if (s == 0) {
87 s = (char *)malloc(18);
88 if (s == 0)
89 return (0);
90 }
91 s[0] = 0;
92 sprintf(s, "%x:%x:%x:%x:%x:%x",
93 EI(0), EI(1), EI(2), EI(3), EI(4), EI(5));
94 return (s);
95 }
96
97 /*
98 * Converts a ethernet address representation back into its 48 bits.
99 */
100 struct ether_addr *
ether_aton(char * s)101 ether_aton(char *s)
102 {
103 static struct ether_addr *ep;
104 int i;
105 unsigned int t[6];
106
107 if (ep == 0) {
108 ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr));
109 if (ep == 0)
110 return (0);
111 }
112 i = sscanf(s, " %x:%x:%x:%x:%x:%x",
113 &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]);
114 if (i != 6)
115 return ((struct ether_addr *)NULL);
116 for (i = 0; i < 6; i++)
117 ep->ether_addr_octet[i] = t[i];
118 return (ep);
119 }
120