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[] =
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";
26#endif
27
28#include <pcap.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <stdarg.h>
33#include <unistd.h>
34#include <errno.h>
35
36#define MAXIMUM_SNAPLEN		65535
37
38static char *program_name;
39
40/* Forwards */
41static void usage(void) __attribute__((noreturn));
42static void error(const char *, ...);
43static void warning(const char *, ...);
44
45extern int optind;
46extern int opterr;
47extern char *optarg;
48
49int
50main(int argc, char **argv)
51{
52	register int op;
53	register char *cp, *device;
54	int dorfmon, dopromisc, snaplen, useactivate, bufsize;
55	char ebuf[PCAP_ERRBUF_SIZE];
56	pcap_t *pd;
57	int status = 0;
58
59	device = NULL;
60	dorfmon = 0;
61	dopromisc = 0;
62	snaplen = MAXIMUM_SNAPLEN;
63	bufsize = 0;
64	useactivate = 0;
65	if ((cp = strrchr(argv[0], '/')) != NULL)
66		program_name = cp + 1;
67	else
68		program_name = argv[0];
69
70	opterr = 0;
71	while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
72		switch (op) {
73
74		case 'i':
75			device = optarg;
76			break;
77
78		case 'I':
79			dorfmon = 1;
80			useactivate = 1;	/* required for rfmon */
81			break;
82
83		case 'p':
84			dopromisc = 1;
85			break;
86
87		case 's': {
88			char *end;
89
90			snaplen = strtol(optarg, &end, 0);
91			if (optarg == end || *end != '\0'
92			    || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
93				error("invalid snaplen %s", optarg);
94			else if (snaplen == 0)
95				snaplen = MAXIMUM_SNAPLEN;
96			break;
97		}
98
99		case 'B':
100			bufsize = atoi(optarg)*1024;
101			if (bufsize <= 0)
102				error("invalid packet buffer size %s", optarg);
103			useactivate = 1;	/* required for bufsize */
104			break;
105
106		case 'a':
107			useactivate = 1;
108			break;
109
110		default:
111			usage();
112			/* NOTREACHED */
113		}
114	}
115
116	if (useactivate) {
117		pd = pcap_create(device, ebuf);
118		if (pd == NULL)
119			error("%s", ebuf);
120		status = pcap_set_snaplen(pd, snaplen);
121		if (status != 0)
122			error("%s: pcap_set_snaplen failed: %s",
123			    device, pcap_statustostr(status));
124		if (dopromisc) {
125			status = pcap_set_promisc(pd, 1);
126			if (status != 0)
127				error("%s: pcap_set_promisc failed: %s",
128				    device, pcap_statustostr(status));
129		}
130		if (dorfmon) {
131			status = pcap_set_rfmon(pd, 1);
132			if (status != 0)
133				error("%s: pcap_set_rfmon failed: %s",
134				    device, pcap_statustostr(status));
135		}
136		status = pcap_set_timeout(pd, 1000);
137		if (status != 0)
138			error("%s: pcap_set_timeout failed: %s",
139			    device, pcap_statustostr(status));
140		if (bufsize != 0) {
141			status = pcap_set_buffer_size(pd, bufsize);
142			if (status != 0)
143				error("%s: pcap_set_buffer_size failed: %s",
144				    device, pcap_statustostr(status));
145		}
146		status = pcap_activate(pd);
147		if (status < 0) {
148			/*
149			 * pcap_activate() failed.
150			 */
151			error("%s: %s\n(%s)", device,
152			    pcap_statustostr(status), pcap_geterr(pd));
153		} else if (status > 0) {
154			/*
155			 * pcap_activate() succeeded, but it's warning us
156			 * of a problem it had.
157			 */
158			warning("%s: %s\n(%s)", device,
159			    pcap_statustostr(status), pcap_geterr(pd));
160		}
161	} else {
162		*ebuf = '\0';
163		pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
164		if (pd == NULL)
165			error("%s", ebuf);
166		else if (*ebuf)
167			warning("%s", ebuf);
168	}
169	pcap_close(pd);
170	exit(status < 0 ? 1 : 0);
171}
172
173static void
174usage(void)
175{
176	(void)fprintf(stderr,
177	    "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
178	    program_name);
179	exit(1);
180}
181
182/* VARARGS */
183static void
184error(const char *fmt, ...)
185{
186	va_list ap;
187
188	(void)fprintf(stderr, "%s: ", program_name);
189	va_start(ap, fmt);
190	(void)vfprintf(stderr, fmt, ap);
191	va_end(ap);
192	if (*fmt) {
193		fmt += strlen(fmt);
194		if (fmt[-1] != '\n')
195			(void)fputc('\n', stderr);
196	}
197	exit(1);
198	/* NOTREACHED */
199}
200
201/* VARARGS */
202static void
203warning(const char *fmt, ...)
204{
205	va_list ap;
206
207	(void)fprintf(stderr, "%s: WARNING: ", program_name);
208	va_start(ap, fmt);
209	(void)vfprintf(stderr, fmt, ap);
210	va_end(ap);
211	if (*fmt) {
212		fmt += strlen(fmt);
213		if (fmt[-1] != '\n')
214			(void)fputc('\n', stderr);
215	}
216}
217