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 1.23 2006-10-04 18:09:22 guy Exp $ (LBL)"; 25 #endif 26 27 #ifdef HAVE_CONFIG_H 28 #include "config.h" 29 #endif 30 31 #ifdef WIN32 32 #include <pcap-stdinc.h> 33 #else /* WIN32 */ 34 #if HAVE_INTTYPES_H 35 #include <inttypes.h> 36 #elif HAVE_STDINT_H 37 #include <stdint.h> 38 #endif 39 #ifdef HAVE_SYS_BITYPES_H 40 #include <sys/bitypes.h> 41 #endif 42 #include <sys/types.h> 43 #endif /* WIN32 */ 44 45 #include <ctype.h> 46 #include <memory.h> 47 #include <stdio.h> 48 #include <string.h> 49 50 #include "pcap-int.h" 51 52 #include <pcap/namedb.h> 53 54 #ifdef HAVE_OS_PROTO_H 55 #include "os-proto.h" 56 #endif 57 58 static inline int xdtoi(int); 59 static inline int skip_space(FILE *); 60 static inline int skip_line(FILE *); 61 62 /* Hex digit to integer. */ 63 static inline int 64 xdtoi(c) 65 register int c; 66 { 67 if (isdigit(c)) 68 return c - '0'; 69 else if (islower(c)) 70 return c - 'a' + 10; 71 else 72 return c - 'A' + 10; 73 } 74 75 static inline int 76 skip_space(f) 77 FILE *f; 78 { 79 int c; 80 81 do { 82 c = getc(f); 83 } while (isspace(c) && c != '\n'); 84 85 return c; 86 } 87 88 static inline int 89 skip_line(f) 90 FILE *f; 91 { 92 int c; 93 94 do 95 c = getc(f); 96 while (c != '\n' && c != EOF); 97 98 return c; 99 } 100 101 struct pcap_etherent * 102 pcap_next_etherent(FILE *fp) 103 { 104 register int c, d, i; 105 char *bp; 106 static struct pcap_etherent e; 107 108 memset((char *)&e, 0, sizeof(e)); 109 do { 110 /* Find addr */ 111 c = skip_space(fp); 112 if (c == '\n') 113 continue; 114 115 /* If this is a comment, or first thing on line 116 cannot be etehrnet address, skip the line. */ 117 if (!isxdigit(c)) { 118 c = skip_line(fp); 119 continue; 120 } 121 122 /* must be the start of an address */ 123 for (i = 0; i < 6; i += 1) { 124 d = xdtoi(c); 125 c = getc(fp); 126 if (isxdigit(c)) { 127 d <<= 4; 128 d |= xdtoi(c); 129 c = getc(fp); 130 } 131 e.addr[i] = d; 132 if (c != ':') 133 break; 134 c = getc(fp); 135 } 136 if (c == EOF) 137 break; 138 139 /* Must be whitespace */ 140 if (!isspace(c)) { 141 c = skip_line(fp); 142 continue; 143 } 144 c = skip_space(fp); 145 146 /* hit end of line... */ 147 if (c == '\n') 148 continue; 149 150 if (c == '#') { 151 c = skip_line(fp); 152 continue; 153 } 154 155 /* pick up name */ 156 bp = e.name; 157 /* Use 'd' to prevent buffer overflow. */ 158 d = sizeof(e.name) - 1; 159 do { 160 *bp++ = c; 161 c = getc(fp); 162 } while (!isspace(c) && c != EOF && --d > 0); 163 *bp = '\0'; 164 165 /* Eat trailing junk */ 166 if (c != '\n') 167 (void)skip_line(fp); 168 169 return &e; 170 171 } while (c != EOF); 172 173 return (NULL); 174 } 175