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 #pragma ident "%Z%%M% %I% %E% SMI" 23 24 /* 25 * Copyright (c) 1990 by Sun Microsystems, Inc. 26 * 27 * All routines necessary to deal with the file /etc/ethers. The file 28 * contains mappings from 48 bit ethernet addresses to their corresponding 29 * hosts name. The addresses have an ascii representation of the form 30 * "x:x:x:x:x:x" where x is a hex number between 0x00 and 0xff; the 31 * bytes are always in network order. 32 */ 33 34 #include <stdio.h> 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <net/if.h> 38 #include <netinet/in.h> 39 #include <net/if_arp.h> 40 #include <netinet/if_ether.h> 41 42 static char *domain; /* NIS domain name */ 43 static int usingyellow; 44 static char *ethers = "/etc/ethers"; 45 46 /* 47 * Parses a line from /etc/ethers into its components. The line has the form 48 * 8:0:20:1:17:c8 krypton 49 * where the first part is a 48 bit ethernet addrerss and the second is 50 * the corresponding hosts name. 51 * Returns zero if successful, non-zero otherwise. 52 */ 53 ether_line(s, e, hostname) 54 char *s; /* the string to be parsed */ 55 struct ether_addr *e; /* ethernet address struct to be filled in */ 56 char *hostname; /* hosts name to be set */ 57 { 58 register int i; 59 unsigned int t[6]; 60 61 i = sscanf(s, " %x:%x:%x:%x:%x:%x %s", 62 &t[0], &t[1], &t[2], &t[3], &t[4], &t[5], hostname); 63 if (i != 7) { 64 return (7 - i); 65 } 66 for (i = 0; i < 6; i++) 67 e->ether_addr_octet[i] = t[i]; 68 return (0); 69 } 70 71 /* 72 * Converts a 48 bit ethernet number to its string representation. 73 */ 74 #define EI(i) (unsigned int)(e->ether_addr_octet[(i)]) 75 char * 76 ether_ntoa(e) 77 struct ether_addr *e; 78 { 79 static char *s; 80 81 if (s == 0) { 82 s = (char *)malloc(18); 83 if (s == 0) 84 return (0); 85 } 86 s[0] = 0; 87 sprintf(s, "%x:%x:%x:%x:%x:%x", 88 EI(0), EI(1), EI(2), EI(3), EI(4), EI(5)); 89 return (s); 90 } 91 92 /* 93 * Converts a ethernet address representation back into its 48 bits. 94 */ 95 struct ether_addr * 96 ether_aton(s) 97 char *s; 98 { 99 static struct ether_addr *ep; 100 register int i; 101 unsigned int t[6]; 102 103 if (ep == 0) { 104 ep = (struct ether_addr *)calloc(1, sizeof (struct ether_addr)); 105 if (ep == 0) 106 return (0); 107 } 108 i = sscanf(s, " %x:%x:%x:%x:%x:%x", 109 &t[0], &t[1], &t[2], &t[3], &t[4], &t[5]); 110 if (i != 6) 111 return ((struct ether_addr *)NULL); 112 for (i = 0; i < 6; i++) 113 ep->ether_addr_octet[i] = t[i]; 114 return (ep); 115 } 116