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 1.23 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
58static inline int xdtoi(int);
59static inline int skip_space(FILE *);
60static inline int skip_line(FILE *);
61
62/* Hex digit to integer. */
63static inline int
64xdtoi(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
75static inline int
76skip_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
88static inline int
89skip_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
101struct pcap_etherent *
102pcap_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