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
xdtoi(c)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
skip_space(f)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
skip_line(f)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 *
pcap_next_etherent(FILE * fp)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