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 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Function implementations to convert between link layer addresses and 29 * ascii representations of the form "x:x:x:...:x:x:x" where x is a hex 30 * number between 0x00 and 0xff; the bytes are always in network order. 31 */ 32 33 #include <stdio.h> 34 #include <ctype.h> 35 #include <stdlib.h> 36 #include <sys/types.h> 37 #include <net/if_dl.h> 38 39 /* 40 * Converts a "size" bytes long mac address to its string representation. 41 * Currently, the "mactype" is unused, but in the future, the string 42 * can be modulated by "mactype" (IFT_* value from <net/if_types.h>) 43 */ 44 /* ARGSUSED */ 45 char * 46 _link_ntoa(const unsigned char *macaddr, char *str, int size, int mactype) 47 { 48 char *buf; 49 int i, n; 50 51 if (((buf = str) == NULL) && 52 ((buf = malloc(3 * size)) == NULL)) 53 return (NULL); 54 n = sprintf(buf, "%x", *macaddr++); 55 for (i = 0; i < (size - 1); i++) 56 n += sprintf(buf+n, ":%x", *macaddr++); 57 return (buf); 58 } 59 60 /* 61 * Converts a string possibly representing a link address into its 62 * bit format, returning length of the address in bytes. 63 */ 64 uchar_t * 65 _link_aton(const char *ascaddr, int *maclen) 66 { 67 unsigned char cval, num = 0; 68 int idx = 0, numcolons = 0, digits = 0; 69 uchar_t *netaddr; 70 const char *cptr; 71 char lastc = ':'; 72 73 while (isspace(*ascaddr)) 74 ascaddr++; 75 76 /* 77 * Find how many :'s in the string. Also sanity check 78 * the string for valid hex chars, absence of white 79 * spaces, not starting or ending with :, absence of 80 * consecutive :'s, excessive digits per element 81 * and non-null string. 82 */ 83 cptr = ascaddr; 84 while ((cval = *cptr++) != '\0') { 85 if (cval == ':') { 86 if (lastc == ':') 87 break; 88 numcolons++; 89 digits = 0; 90 } else if (!isxdigit(cval)) { 91 break; 92 } else { 93 digits++; 94 } 95 96 if (digits > 2) 97 break; 98 99 lastc = cval; 100 } 101 if ((lastc == ':') || (cval != '\0' && !isspace(cval)) || 102 (digits > 2)) { 103 *maclen = -1; 104 return (NULL); 105 } 106 107 if ((netaddr = malloc(numcolons + 1)) == NULL) { 108 *maclen = 0; 109 return (NULL); 110 } 111 112 for (;;) { 113 cval = *ascaddr++; 114 if (isdigit(cval)) { 115 num = (num << 4) | (cval - '0'); 116 } else if (isxdigit(cval)) { 117 num = (num << 4) | 118 (cval - (isupper(cval) ? 'A' : 'a') + 10); 119 } else if (cval == ':') { 120 netaddr[idx++] = num; 121 num = 0; 122 } else { 123 /* 124 * We must have hit a whitespace. Stop 125 * parsing now. 126 */ 127 netaddr[idx++] = num; 128 break; 129 } 130 } 131 *maclen = idx; 132 return (netaddr); 133 } 134