1/*	$FreeBSD$	*/
2
3/*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 */
8#if !defined(lint)
9static const char sccsid[] = "@(#)ipft_hx.c	1.1 3/9/96 (C) 1996 Darren Reed";
10static const char rcsid[] = "@(#)$Id$";
11#endif
12
13#include <ctype.h>
14
15#include "ipf.h"
16#include "ipt.h"
17
18
19extern	int	opts;
20
21static	int	hex_open __P((char *));
22static	int	hex_close __P((void));
23static	int	hex_readip __P((mb_t *, char **, int *));
24static	char	*readhex __P((char *, char *));
25
26struct	ipread	iphex = { hex_open, hex_close, hex_readip, 0 };
27static	FILE	*tfp = NULL;
28static	int	tfd = -1;
29
30static	int	hex_open(fname)
31	char	*fname;
32{
33	if (tfp && tfd != -1) {
34		rewind(tfp);
35		return tfd;
36	}
37
38	if (!strcmp(fname, "-")) {
39		tfd = 0;
40		tfp = stdin;
41	} else {
42		tfd = open(fname, O_RDONLY);
43		if (tfd != -1)
44			tfp = fdopen(tfd, "r");
45	}
46	return tfd;
47}
48
49
50static	int	hex_close()
51{
52	int	cfd = tfd;
53
54	tfd = -1;
55	return close(cfd);
56}
57
58
59static	int	hex_readip(mb, ifn, dir)
60	mb_t	*mb;
61	char	**ifn;
62	int	*dir;
63{
64	register char *s, *t, *u;
65	char	line[513];
66	ip_t	*ip;
67	char	*buf;
68	int	cnt;
69
70	buf = (char *)mb->mb_buf;
71	cnt = sizeof(mb->mb_buf);
72	/*
73	 * interpret start of line as possibly "[ifname]" or
74	 * "[in/out,ifname]".
75	 */
76	if (ifn)
77		*ifn = NULL;
78	if (dir)
79		*dir = 0;
80 	ip = (ip_t *)buf;
81	while (fgets(line, sizeof(line)-1, tfp)) {
82		if ((s = strchr(line, '\n'))) {
83			if (s == line) {
84				mb->mb_len = (char *)ip - buf;
85				return mb->mb_len;
86			}
87			*s = '\0';
88		}
89		if ((s = strchr(line, '#')))
90			*s = '\0';
91		if (!*line)
92			continue;
93		if ((opts & OPT_DEBUG) != 0) {
94			printf("input: %s", line);
95		}
96
97		if ((*line == '[') && (s = strchr(line, ']'))) {
98			t = line + 1;
99			if (s - t > 0) {
100				*s++ = '\0';
101				if ((u = strchr(t, ',')) && (u < s)) {
102					u++;
103					if (ifn)
104						*ifn = strdup(u);
105					if (dir) {
106						if (*t == 'i')
107							*dir = 0;
108						else if (*t == 'o')
109							*dir = 1;
110					}
111				} else if (ifn)
112					*ifn = t;
113			}
114
115			while (*s++ == '+') {
116				if (!strncasecmp(s, "mcast", 5)) {
117					mb->mb_flags |= M_MCAST;
118					s += 5;
119				}
120				if (!strncasecmp(s, "bcast", 5)) {
121					mb->mb_flags |= M_BCAST;
122					s += 5;
123				}
124				if (!strncasecmp(s, "mbcast", 6)) {
125					mb->mb_flags |= M_MBCAST;
126					s += 6;
127				}
128			}
129			while (ISSPACE(*s))
130				s++;
131		} else
132			s = line;
133		t = (char *)ip;
134		ip = (ip_t *)readhex(s, (char *)ip);
135		if ((opts & OPT_DEBUG) != 0) {
136			if (opts & OPT_ASCII) {
137				int c = *t;
138				if (t < (char *)ip)
139					putchar('\t');
140				while (t < (char *)ip) {
141					if (isprint(c) && isascii(c))
142						putchar(c);
143					else
144						putchar('.');
145					t++;
146				}
147			}
148			putchar('\n');
149			fflush(stdout);
150		}
151	}
152	if (feof(tfp))
153		return 0;
154	return -1;
155}
156
157
158static	char	*readhex(src, dst)
159register char	*src, *dst;
160{
161	int	state = 0;
162	char	c;
163
164	while ((c = *src++)) {
165		if (ISSPACE(c)) {
166			if (state) {
167				dst++;
168				state = 0;
169			}
170			continue;
171		} else if ((c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
172			   (c >= 'A' && c <= 'F')) {
173			c = ISDIGIT(c) ? (c - '0') : (TOUPPER(c) - 55);
174			if (state == 0) {
175				*dst = (c << 4);
176				state++;
177			} else {
178				*dst++ |= c;
179				state = 0;
180			}
181		} else
182			break;
183	}
184	return dst;
185}
186