etherent.c revision 127664 
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
23static const char rcsid[] _U_ =
24    "@(#) $Header: /tcpdump/master/libpcap/etherent.c,v 1.21.6.1 2003/11/15 23:26:38 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
46static inline int xdtoi(int);
47static inline int skip_space(FILE *);
48static inline int skip_line(FILE *);
49
50/* Hex digit to integer. */
51static inline int
52xdtoi(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
63static inline int
64skip_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
76static inline int
77skip_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
89struct pcap_etherent *
90pcap_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