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#include "varattrs.h"
23
24#ifndef lint
25static const char copyright[] _U_ =
26    "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
27The Regents of the University of California.  All rights reserved.\n";
28#endif
29
30#include <pcap.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <string.h>
34#include <stdarg.h>
35#ifdef _WIN32
36  #include "getopt.h"
37#else
38  #include <unistd.h>
39#endif
40#include <errno.h>
41
42#include "pcap/funcattrs.h"
43
44#ifdef _WIN32
45  #include "portability.h"
46#endif
47
48#define MAXIMUM_SNAPLEN		65535
49
50static char *program_name;
51
52/* Forwards */
53static void PCAP_NORETURN usage(void);
54static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
55static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
56
57int
58main(int argc, char **argv)
59{
60	register int op;
61	register char *cp, *device;
62	int dorfmon, dopromisc, snaplen, useactivate, bufsize;
63	char ebuf[PCAP_ERRBUF_SIZE];
64	pcap_if_t *devlist;
65	pcap_t *pd;
66	int status = 0;
67
68	device = NULL;
69	dorfmon = 0;
70	dopromisc = 0;
71	snaplen = MAXIMUM_SNAPLEN;
72	bufsize = 0;
73	useactivate = 0;
74	if ((cp = strrchr(argv[0], '/')) != NULL)
75		program_name = cp + 1;
76	else
77		program_name = argv[0];
78
79	opterr = 0;
80	while ((op = getopt(argc, argv, "i:Ips:aB:")) != -1) {
81		switch (op) {
82
83		case 'i':
84			device = optarg;
85			break;
86
87		case 'I':
88			dorfmon = 1;
89			useactivate = 1;	/* required for rfmon */
90			break;
91
92		case 'p':
93			dopromisc = 1;
94			break;
95
96		case 's': {
97			char *end;
98
99			snaplen = strtol(optarg, &end, 0);
100			if (optarg == end || *end != '\0'
101			    || snaplen < 0 || snaplen > MAXIMUM_SNAPLEN)
102				error("invalid snaplen %s", optarg);
103			else if (snaplen == 0)
104				snaplen = MAXIMUM_SNAPLEN;
105			break;
106		}
107
108		case 'B':
109			bufsize = atoi(optarg)*1024;
110			if (bufsize <= 0)
111				error("invalid packet buffer size %s", optarg);
112			useactivate = 1;	/* required for bufsize */
113			break;
114
115		case 'a':
116			useactivate = 1;
117			break;
118
119		default:
120			usage();
121			/* NOTREACHED */
122		}
123	}
124
125	if (device == NULL) {
126		if (pcap_findalldevs(&devlist, ebuf) == -1)
127			error("%s", ebuf);
128		if (devlist == NULL)
129			error("no interfaces available for capture");
130		device = strdup(devlist->name);
131		pcap_freealldevs(devlist);
132	}
133	if (useactivate) {
134		pd = pcap_create(device, ebuf);
135		if (pd == NULL)
136			error("%s: pcap_create failed: %s", device, ebuf);
137		status = pcap_set_snaplen(pd, snaplen);
138		if (status != 0)
139			error("%s: pcap_set_snaplen failed: %s",
140			    device, pcap_statustostr(status));
141		if (dopromisc) {
142			status = pcap_set_promisc(pd, 1);
143			if (status != 0)
144				error("%s: pcap_set_promisc failed: %s",
145				    device, pcap_statustostr(status));
146		}
147		if (dorfmon) {
148			status = pcap_set_rfmon(pd, 1);
149			if (status != 0)
150				error("%s: pcap_set_rfmon failed: %s",
151				    device, pcap_statustostr(status));
152		}
153		status = pcap_set_timeout(pd, 1000);
154		if (status != 0)
155			error("%s: pcap_set_timeout failed: %s",
156			    device, pcap_statustostr(status));
157		if (bufsize != 0) {
158			status = pcap_set_buffer_size(pd, bufsize);
159			if (status != 0)
160				error("%s: pcap_set_buffer_size failed: %s",
161				    device, pcap_statustostr(status));
162		}
163		status = pcap_activate(pd);
164		if (status < 0) {
165			/*
166			 * pcap_activate() failed.
167			 */
168			error("%s: %s\n(%s)", device,
169			    pcap_statustostr(status), pcap_geterr(pd));
170		} else if (status > 0) {
171			/*
172			 * pcap_activate() succeeded, but it's warning us
173			 * of a problem it had.
174			 */
175			warning("%s: %s\n(%s)", device,
176			    pcap_statustostr(status), pcap_geterr(pd));
177		} else
178			printf("%s opened successfully\n", device);
179	} else {
180		*ebuf = '\0';
181		pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
182		if (pd == NULL)
183			error("%s", ebuf);
184		else if (*ebuf)
185			warning("%s", ebuf);
186		else
187			printf("%s opened successfully\n", device);
188	}
189	pcap_close(pd);
190	exit(status < 0 ? 1 : 0);
191}
192
193static void
194usage(void)
195{
196	(void)fprintf(stderr,
197	    "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
198	    program_name);
199	exit(1);
200}
201
202/* VARARGS */
203static void
204error(const char *fmt, ...)
205{
206	va_list ap;
207
208	(void)fprintf(stderr, "%s: ", program_name);
209	va_start(ap, fmt);
210	(void)vfprintf(stderr, fmt, ap);
211	va_end(ap);
212	if (*fmt) {
213		fmt += strlen(fmt);
214		if (fmt[-1] != '\n')
215			(void)fputc('\n', stderr);
216	}
217	exit(1);
218	/* NOTREACHED */
219}
220
221/* VARARGS */
222static void
223warning(const char *fmt, ...)
224{
225	va_list ap;
226
227	(void)fprintf(stderr, "%s: WARNING: ", program_name);
228	va_start(ap, fmt);
229	(void)vfprintf(stderr, fmt, ap);
230	va_end(ap);
231	if (*fmt) {
232		fmt += strlen(fmt);
233		if (fmt[-1] != '\n')
234			(void)fputc('\n', stderr);
235	}
236}
237