1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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 copyright[] _U_ =
24    "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
25The Regents of the University of California.  All rights reserved.\n";
26static const char rcsid[] _U_ =
27    "@(#) $Header: /tcpdump/master/libpcap/filtertest.c,v 1.2 2005-08-08 17:50:13 guy Exp $ (LBL)";
28#endif
29
30#ifdef HAVE_CONFIG_H
31#include "config.h"
32#endif
33
34#include <pcap.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <stdarg.h>
39#include <unistd.h>
40#include <fcntl.h>
41#include <errno.h>
42#include <arpa/inet.h>
43#include <sys/types.h>
44#include <sys/stat.h>
45
46#ifndef HAVE___ATTRIBUTE__
47#define __attribute__(x)
48#endif
49
50static char *program_name;
51
52/* Forwards */
53static void usage(void) __attribute__((noreturn));
54static void error(const char *, ...)
55    __attribute__((noreturn, format (printf, 1, 2)));
56
57extern int optind;
58extern int opterr;
59extern char *optarg;
60
61/*
62 * On Windows, we need to open the file in binary mode, so that
63 * we get all the bytes specified by the size we get from "fstat()".
64 * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
65 * we define it as 0 if it's not defined, so it does nothing.
66 */
67#ifndef O_BINARY
68#define O_BINARY	0
69#endif
70
71static char *
72read_infile(char *fname)
73{
74	register int i, fd, cc;
75	register char *cp;
76	struct stat buf;
77
78	fd = open(fname, O_RDONLY|O_BINARY);
79	if (fd < 0)
80		error("can't open %s: %s", fname, pcap_strerror(errno));
81
82	if (fstat(fd, &buf) < 0)
83		error("can't stat %s: %s", fname, pcap_strerror(errno));
84
85	cp = malloc((u_int)buf.st_size + 1);
86	if (cp == NULL)
87		error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
88			fname, pcap_strerror(errno));
89	cc = read(fd, cp, (u_int)buf.st_size);
90	if (cc < 0)
91		error("read %s: %s", fname, pcap_strerror(errno));
92	if (cc != buf.st_size)
93		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
94
95	close(fd);
96	/* replace "# comment" with spaces */
97	for (i = 0; i < cc; i++) {
98		if (cp[i] == '#')
99			while (i < cc && cp[i] != '\n')
100				cp[i++] = ' ';
101	}
102	cp[cc] = '\0';
103	return (cp);
104}
105
106/* VARARGS */
107static void
108error(const char *fmt, ...)
109{
110	va_list ap;
111
112	(void)fprintf(stderr, "%s: ", program_name);
113	va_start(ap, fmt);
114	(void)vfprintf(stderr, fmt, ap);
115	va_end(ap);
116	if (*fmt) {
117		fmt += strlen(fmt);
118		if (fmt[-1] != '\n')
119			(void)fputc('\n', stderr);
120	}
121	exit(1);
122	/* NOTREACHED */
123}
124
125/*
126 * Copy arg vector into a new buffer, concatenating arguments with spaces.
127 */
128static char *
129copy_argv(register char **argv)
130{
131	register char **p;
132	register u_int len = 0;
133	char *buf;
134	char *src, *dst;
135
136	p = argv;
137	if (*p == 0)
138		return 0;
139
140	while (*p)
141		len += strlen(*p++) + 1;
142
143	buf = (char *)malloc(len);
144	if (buf == NULL)
145		error("copy_argv: malloc");
146
147	p = argv;
148	dst = buf;
149	while ((src = *p++) != NULL) {
150		while ((*dst++ = *src++) != '\0')
151			;
152		dst[-1] = ' ';
153	}
154	dst[-1] = '\0';
155
156	return buf;
157}
158
159int
160main(int argc, char **argv)
161{
162	char *cp;
163	int op;
164	int dflag;
165	char *infile;
166	int Oflag;
167	long snaplen;
168	int dlt;
169	bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
170	char *cmdbuf;
171	pcap_t *pd;
172	struct bpf_program fcode;
173
174#ifdef WIN32
175	if(wsockinit() != 0) return 1;
176#endif /* WIN32 */
177
178	dflag = 1;
179	infile = NULL;
180	Oflag = 1;
181	snaplen = 68;
182
183	if ((cp = strrchr(argv[0], '/')) != NULL)
184		program_name = cp + 1;
185	else
186		program_name = argv[0];
187
188	opterr = 0;
189	while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
190		switch (op) {
191
192		case 'd':
193			++dflag;
194			break;
195
196		case 'F':
197			infile = optarg;
198			break;
199
200		case 'O':
201			Oflag = 0;
202			break;
203
204		case 'm': {
205			in_addr_t addr;
206
207			addr = inet_addr(optarg);
208			if (addr == INADDR_NONE)
209				error("invalid netmask %s", optarg);
210			netmask = addr;
211			break;
212		}
213
214		case 's': {
215			char *end;
216
217			snaplen = strtol(optarg, &end, 0);
218			if (optarg == end || *end != '\0'
219			    || snaplen < 0 || snaplen > 65535)
220				error("invalid snaplen %s", optarg);
221			else if (snaplen == 0)
222				snaplen = 65535;
223			break;
224		}
225
226		default:
227			usage();
228			/* NOTREACHED */
229		}
230	}
231
232	if (optind >= argc) {
233		usage();
234		/* NOTREACHED */
235	}
236
237	dlt = pcap_datalink_name_to_val(argv[optind]);
238	if (dlt < 0)
239		error("invalid data link type %s", argv[optind]);
240
241	if (infile)
242		cmdbuf = read_infile(infile);
243	else
244		cmdbuf = copy_argv(&argv[optind+1]);
245
246	pd = pcap_open_dead(dlt, snaplen);
247	if (pd == NULL)
248		error("Can't open fake pcap_t");
249
250	if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
251		error("%s", pcap_geterr(pd));
252	bpf_dump(&fcode, dflag);
253	pcap_close(pd);
254	exit(0);
255}
256
257static void
258usage(void)
259{
260	(void)fprintf(stderr, "%s, with %s\n", program_name,
261	    pcap_lib_version());
262	(void)fprintf(stderr,
263	    "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
264	    program_name);
265	exit(1);
266}
267