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[] = 24 "@(#) $Header: /tcpdump/master/libpcap/etherent.c,v 1.20.1.1 1999/10/07 23:46:40 mcr Exp $ (LBL)"; 25 #endif 26 27 #include <sys/types.h> 28 29 #include <ctype.h> 30 #include <memory.h> 31 #include <stdio.h> 32 #include <string.h> 33 34 #include "pcap-int.h" 35 36 #include <pcap-namedb.h> 37 38 #include "gnuc.h" 39 #ifdef HAVE_OS_PROTO_H 40 #include "os-proto.h" 41 #endif 42 43 static inline int xdtoi(int); 44 static inline int skip_space(FILE *); 45 static inline int skip_line(FILE *); 46 47 /* Hex digit to integer. */ 48 static inline int 49 xdtoi(c) 50 register int c; 51 { 52 if (isdigit(c)) 53 return c - '0'; 54 else if (islower(c)) 55 return c - 'a' + 10; 56 else 57 return c - 'A' + 10; 58 } 59 60 static inline int 61 skip_space(f) 62 FILE *f; 63 { 64 int c; 65 66 do { 67 c = getc(f); 68 } while (isspace(c) && c != '\n'); 69 70 return c; 71 } 72 73 static inline int 74 skip_line(f) 75 FILE *f; 76 { 77 int c; 78 79 do 80 c = getc(f); 81 while (c != '\n' && c != EOF); 82 83 return c; 84 } 85 86 struct pcap_etherent * 87 pcap_next_etherent(FILE *fp) 88 { 89 register int c, d, i; 90 char *bp; 91 static struct pcap_etherent e; 92 93 memset((char *)&e, 0, sizeof(e)); 94 do { 95 /* Find addr */ 96 c = skip_space(fp); 97 if (c == '\n') 98 continue; 99 100 /* If this is a comment, or first thing on line 101 cannot be etehrnet address, skip the line. */ 102 if (!isxdigit(c)) { 103 c = skip_line(fp); 104 continue; 105 } 106 107 /* must be the start of an address */ 108 for (i = 0; i < 6; i += 1) { 109 d = xdtoi(c); 110 c = getc(fp); 111 if (isxdigit(c)) { 112 d <<= 4; 113 d |= xdtoi(c); 114 c = getc(fp); 115 } 116 e.addr[i] = d; 117 if (c != ':') 118 break; 119 c = getc(fp); 120 } 121 if (c == EOF) 122 break; 123 124 /* Must be whitespace */ 125 if (!isspace(c)) { 126 c = skip_line(fp); 127 continue; 128 } 129 c = skip_space(fp); 130 131 /* hit end of line... */ 132 if (c == '\n') 133 continue; 134 135 if (c == '#') { 136 c = skip_line(fp); 137 continue; 138 } 139 140 /* pick up name */ 141 bp = e.name; 142 /* Use 'd' to prevent buffer overflow. */ 143 d = sizeof(e.name) - 1; 144 do { 145 *bp++ = c; 146 c = getc(fp); 147 } while (!isspace(c) && c != EOF && --d > 0); 148 *bp = '\0'; 149 150 /* Eat trailing junk */ 151 if (c != '\n') 152 (void)skip_line(fp); 153 154 return &e; 155 156 } while (c != EOF); 157 158 return (NULL); 159 } 160