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 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 * 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 * 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