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 #ifdef HAVE_CONFIG_H 23 #include <config.h> 24 #endif 25 26 #include <pcap-types.h> 27 28 #include <ctype.h> 29 #include <memory.h> 30 #include <stdio.h> 31 #include <string.h> 32 33 #include "pcap-int.h" 34 35 #include <pcap/namedb.h> 36 37 #ifdef HAVE_OS_PROTO_H 38 #include "os-proto.h" 39 #endif 40 41 static inline int skip_space(FILE *); 42 static inline int skip_line(FILE *); 43 44 /* Hex digit to integer. */ 45 static inline u_char 46 xdtoi(u_char c) 47 { 48 if (isdigit(c)) 49 return (u_char)(c - '0'); 50 else if (islower(c)) 51 return (u_char)(c - 'a' + 10); 52 else 53 return (u_char)(c - 'A' + 10); 54 } 55 56 static inline int 57 skip_space(FILE *f) 58 { 59 int c; 60 61 do { 62 c = getc(f); 63 } while (isspace(c) && c != '\n'); 64 65 return c; 66 } 67 68 static inline int 69 skip_line(FILE *f) 70 { 71 int c; 72 73 do 74 c = getc(f); 75 while (c != '\n' && c != EOF); 76 77 return c; 78 } 79 80 struct pcap_etherent * 81 pcap_next_etherent(FILE *fp) 82 { 83 register int c, i; 84 u_char d; 85 char *bp; 86 size_t namesize; 87 static struct pcap_etherent e; 88 89 memset((char *)&e, 0, sizeof(e)); 90 for (;;) { 91 /* Find addr */ 92 c = skip_space(fp); 93 if (c == EOF) 94 return (NULL); 95 if (c == '\n') 96 continue; 97 98 /* If this is a comment, or first thing on line 99 cannot be Ethernet address, skip the line. */ 100 if (!isxdigit(c)) { 101 c = skip_line(fp); 102 if (c == EOF) 103 return (NULL); 104 continue; 105 } 106 107 /* must be the start of an address */ 108 for (i = 0; i < 6; i += 1) { 109 d = xdtoi((u_char)c); 110 c = getc(fp); 111 if (c == EOF) 112 return (NULL); 113 if (isxdigit(c)) { 114 d <<= 4; 115 d |= xdtoi((u_char)c); 116 c = getc(fp); 117 if (c == EOF) 118 return (NULL); 119 } 120 e.addr[i] = d; 121 if (c != ':') 122 break; 123 c = getc(fp); 124 if (c == EOF) 125 return (NULL); 126 } 127 128 /* Must be whitespace */ 129 if (!isspace(c)) { 130 c = skip_line(fp); 131 if (c == EOF) 132 return (NULL); 133 continue; 134 } 135 c = skip_space(fp); 136 if (c == EOF) 137 return (NULL); 138 139 /* hit end of line... */ 140 if (c == '\n') 141 continue; 142 143 if (c == '#') { 144 c = skip_line(fp); 145 if (c == EOF) 146 return (NULL); 147 continue; 148 } 149 150 /* pick up name */ 151 bp = e.name; 152 /* Use 'namesize' to prevent buffer overflow. */ 153 namesize = sizeof(e.name) - 1; 154 do { 155 *bp++ = (u_char)c; 156 c = getc(fp); 157 if (c == EOF) 158 return (NULL); 159 } while (!isspace(c) && --namesize != 0); 160 *bp = '\0'; 161 162 /* Eat trailing junk */ 163 if (c != '\n') 164 (void)skip_line(fp); 165 166 return &e; 167 } 168 } 169