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		262144
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 = strdup(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			long long_snaplen;
99
100			long_snaplen = strtol(optarg, &end, 0);
101			if (optarg == end || *end != '\0'
102			    || long_snaplen < 0
103			    || long_snaplen > MAXIMUM_SNAPLEN)
104				error("invalid snaplen %s", optarg);
105			else {
106				if (snaplen == 0)
107					snaplen = MAXIMUM_SNAPLEN;
108				else
109					snaplen = (int)long_snaplen;
110			}
111			break;
112		}
113
114		case 'B':
115			bufsize = atoi(optarg)*1024;
116			if (bufsize <= 0)
117				error("invalid packet buffer size %s", optarg);
118			useactivate = 1;	/* required for bufsize */
119			break;
120
121		case 'a':
122			useactivate = 1;
123			break;
124
125		default:
126			usage();
127			/* NOTREACHED */
128		}
129	}
130
131	if (device == NULL) {
132		if (pcap_findalldevs(&devlist, ebuf) == -1)
133			error("%s", ebuf);
134		if (devlist == NULL)
135			error("no interfaces available for capture");
136		device = strdup(devlist->name);
137		pcap_freealldevs(devlist);
138	}
139	if (useactivate) {
140		pd = pcap_create(device, ebuf);
141		if (pd == NULL)
142			error("%s: pcap_create failed: %s", device, ebuf);
143		status = pcap_set_snaplen(pd, snaplen);
144		if (status != 0)
145			error("%s: pcap_set_snaplen failed: %s",
146			    device, pcap_statustostr(status));
147		if (dopromisc) {
148			status = pcap_set_promisc(pd, 1);
149			if (status != 0)
150				error("%s: pcap_set_promisc failed: %s",
151				    device, pcap_statustostr(status));
152		}
153		if (dorfmon) {
154			status = pcap_set_rfmon(pd, 1);
155			if (status != 0)
156				error("%s: pcap_set_rfmon failed: %s",
157				    device, pcap_statustostr(status));
158		}
159		status = pcap_set_timeout(pd, 1000);
160		if (status != 0)
161			error("%s: pcap_set_timeout failed: %s",
162			    device, pcap_statustostr(status));
163		if (bufsize != 0) {
164			status = pcap_set_buffer_size(pd, bufsize);
165			if (status != 0)
166				error("%s: pcap_set_buffer_size failed: %s",
167				    device, pcap_statustostr(status));
168		}
169		status = pcap_activate(pd);
170		if (status < 0) {
171			/*
172			 * pcap_activate() failed.
173			 */
174			error("%s: %s\n(%s)", device,
175			    pcap_statustostr(status), pcap_geterr(pd));
176		} else if (status > 0) {
177			/*
178			 * pcap_activate() succeeded, but it's warning us
179			 * of a problem it had.
180			 */
181			warning("%s: %s\n(%s)", device,
182			    pcap_statustostr(status), pcap_geterr(pd));
183		} else
184			printf("%s opened successfully\n", device);
185	} else {
186		*ebuf = '\0';
187		pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
188		if (pd == NULL)
189			error("%s", ebuf);
190		else if (*ebuf)
191			warning("%s", ebuf);
192		else
193			printf("%s opened successfully\n", device);
194	}
195	free(device);
196	pcap_close(pd);
197	exit(status < 0 ? 1 : 0);
198}
199
200static void
201usage(void)
202{
203	(void)fprintf(stderr,
204	    "Usage: %s [ -Ipa ] [ -i interface ] [ -s snaplen ] [ -B bufsize ]\n",
205	    program_name);
206	exit(1);
207}
208
209/* VARARGS */
210static void
211error(const char *fmt, ...)
212{
213	va_list ap;
214
215	(void)fprintf(stderr, "%s: ", program_name);
216	va_start(ap, fmt);
217	(void)vfprintf(stderr, fmt, ap);
218	va_end(ap);
219	if (*fmt) {
220		fmt += strlen(fmt);
221		if (fmt[-1] != '\n')
222			(void)fputc('\n', stderr);
223	}
224	exit(1);
225	/* NOTREACHED */
226}
227
228/* VARARGS */
229static void
230warning(const char *fmt, ...)
231{
232	va_list ap;
233
234	(void)fprintf(stderr, "%s: WARNING: ", program_name);
235	va_start(ap, fmt);
236	(void)vfprintf(stderr, fmt, ap);
237	va_end(ap);
238	if (*fmt) {
239		fmt += strlen(fmt);
240		if (fmt[-1] != '\n')
241			(void)fputc('\n', stderr);
242	}
243}
244