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