1 /* 2 * Copyright (c) 1990, 1993, 1994, 1995, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 #ifndef lint 23 static const char rcsid[] _U_ = 24 "@(#) $Header: /tcpdump/master/libpcap/etherent.c,v 1.22 2003/11/15 23:23:57 guy Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #include <sys/types.h> 32 33 #include <ctype.h> 34 #include <memory.h> 35 #include <stdio.h> 36 #include <string.h> 37 38 #include "pcap-int.h" 39 40 #include <pcap-namedb.h> 41 42 #ifdef HAVE_OS_PROTO_H 43 #include "os-proto.h" 44 #endif 45 46 static inline int xdtoi(int); 47 static inline int skip_space(FILE *); 48 static inline int skip_line(FILE *); 49 50 /* Hex digit to integer. */ 51 static inline int 52 xdtoi(c) 53 register int c; 54 { 55 if (isdigit(c)) 56 return c - '0'; 57 else if (islower(c)) 58 return c - 'a' + 10; 59 else 60 return c - 'A' + 10; 61 } 62 63 static inline int 64 skip_space(f) 65 FILE *f; 66 { 67 int c; 68 69 do { 70 c = getc(f); 71 } while (isspace(c) && c != '\n'); 72 73 return c; 74 } 75 76 static inline int 77 skip_line(f) 78 FILE *f; 79 { 80 int c; 81 82 do 83 c = getc(f); 84 while (c != '\n' && c != EOF); 85 86 return c; 87 } 88 89 struct pcap_etherent * 90 pcap_next_etherent(FILE *fp) 91 { 92 register int c, d, i; 93 char *bp; 94 static struct pcap_etherent e; 95 96 memset((char *)&e, 0, sizeof(e)); 97 do { 98 /* Find addr */ 99 c = skip_space(fp); 100 if (c == '\n') 101 continue; 102 103 /* If this is a comment, or first thing on line 104 cannot be etehrnet address, skip the line. */ 105 if (!isxdigit(c)) { 106 c = skip_line(fp); 107 continue; 108 } 109 110 /* must be the start of an address */ 111 for (i = 0; i < 6; i += 1) { 112 d = xdtoi(c); 113 c = getc(fp); 114 if (isxdigit(c)) { 115 d <<= 4; 116 d |= xdtoi(c); 117 c = getc(fp); 118 } 119 e.addr[i] = d; 120 if (c != ':') 121 break; 122 c = getc(fp); 123 } 124 if (c == EOF) 125 break; 126 127 /* Must be whitespace */ 128 if (!isspace(c)) { 129 c = skip_line(fp); 130 continue; 131 } 132 c = skip_space(fp); 133 134 /* hit end of line... */ 135 if (c == '\n') 136 continue; 137 138 if (c == '#') { 139 c = skip_line(fp); 140 continue; 141 } 142 143 /* pick up name */ 144 bp = e.name; 145 /* Use 'd' to prevent buffer overflow. */ 146 d = sizeof(e.name) - 1; 147 do { 148 *bp++ = c; 149 c = getc(fp); 150 } while (!isspace(c) && c != EOF && --d > 0); 151 *bp = '\0'; 152 153 /* Eat trailing junk */ 154 if (c != '\n') 155 (void)skip_line(fp); 156 157 return &e; 158 159 } while (c != EOF); 160 161 return (NULL); 162 } 163