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 <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <stdarg.h>
34#include <limits.h>
35#ifdef _WIN32
36  #include "getopt.h"
37#else
38  #include <unistd.h>
39#endif
40#include <errno.h>
41#include <sys/types.h>
42
43#include <pcap.h>
44
45#include "pcap/funcattrs.h"
46
47#ifdef _WIN32
48  #include "portability.h"
49#endif
50
51static char *program_name;
52
53/* Forwards */
54static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
55static void PCAP_NORETURN usage(void);
56static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
57static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
58static char *copy_argv(char **);
59
60static pcap_t *pd;
61
62int
63main(int argc, char **argv)
64{
65	register int op;
66	register char *cp, *cmdbuf, *device;
67	long longarg;
68	char *p;
69	int timeout = 1000;
70	int immediate = 0;
71	int nonblock = 0;
72	pcap_if_t *devlist;
73	bpf_u_int32 localnet, netmask;
74	struct bpf_program fcode;
75	char ebuf[PCAP_ERRBUF_SIZE];
76	int status;
77	int packet_count;
78
79	device = NULL;
80	if ((cp = strrchr(argv[0], '/')) != NULL)
81		program_name = cp + 1;
82	else
83		program_name = argv[0];
84
85	opterr = 0;
86	while ((op = getopt(argc, argv, "i:mnt:")) != -1) {
87		switch (op) {
88
89		case 'i':
90			device = optarg;
91			break;
92
93		case 'm':
94			immediate = 1;
95			break;
96
97		case 'n':
98			nonblock = 1;
99			break;
100
101		case 't':
102			longarg = strtol(optarg, &p, 10);
103			if (p == optarg || *p != '\0') {
104				error("Timeout value \"%s\" is not a number",
105				    optarg);
106				/* NOTREACHED */
107			}
108			if (longarg < 0) {
109				error("Timeout value %ld is negative", longarg);
110				/* NOTREACHED */
111			}
112			if (longarg > INT_MAX) {
113				error("Timeout value %ld is too large (> %d)",
114				    longarg, INT_MAX);
115				/* NOTREACHED */
116			}
117			timeout = (int)longarg;
118			break;
119
120		default:
121			usage();
122			/* NOTREACHED */
123		}
124	}
125
126	if (device == NULL) {
127		if (pcap_findalldevs(&devlist, ebuf) == -1)
128			error("%s", ebuf);
129		if (devlist == NULL)
130			error("no interfaces available for capture");
131		device = strdup(devlist->name);
132		pcap_freealldevs(devlist);
133	}
134	*ebuf = '\0';
135	pd = pcap_create(device, ebuf);
136	if (pd == NULL)
137		error("%s", ebuf);
138	status = pcap_set_snaplen(pd, 65535);
139	if (status != 0)
140		error("%s: pcap_set_snaplen failed: %s",
141			    device, pcap_statustostr(status));
142	if (immediate) {
143		status = pcap_set_immediate_mode(pd, 1);
144		if (status != 0)
145			error("%s: pcap_set_immediate_mode failed: %s",
146			    device, pcap_statustostr(status));
147	}
148	status = pcap_set_timeout(pd, timeout);
149	if (status != 0)
150		error("%s: pcap_set_timeout failed: %s",
151		    device, pcap_statustostr(status));
152	status = pcap_activate(pd);
153	if (status < 0) {
154		/*
155		 * pcap_activate() failed.
156		 */
157		error("%s: %s\n(%s)", device,
158		    pcap_statustostr(status), pcap_geterr(pd));
159	} else if (status > 0) {
160		/*
161		 * pcap_activate() succeeded, but it's warning us
162		 * of a problem it had.
163		 */
164		warning("%s: %s\n(%s)", device,
165		    pcap_statustostr(status), pcap_geterr(pd));
166	}
167	if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
168		localnet = 0;
169		netmask = 0;
170		warning("%s", ebuf);
171	}
172	cmdbuf = copy_argv(&argv[optind]);
173
174	if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
175		error("%s", pcap_geterr(pd));
176
177	if (pcap_setfilter(pd, &fcode) < 0)
178		error("%s", pcap_geterr(pd));
179	if (pcap_setnonblock(pd, nonblock, ebuf) == -1)
180		error("pcap_setnonblock failed: %s", ebuf);
181	printf("Listening on %s\n", device);
182	for (;;) {
183		packet_count = 0;
184		status = pcap_dispatch(pd, -1, countme,
185		    (u_char *)&packet_count);
186		if (status < 0)
187			break;
188		if (status != 0) {
189			printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
190			    status, packet_count);
191		}
192	}
193	if (status == -2) {
194		/*
195		 * We got interrupted, so perhaps we didn't
196		 * manage to finish a line we were printing.
197		 * Print an extra newline, just in case.
198		 */
199		putchar('\n');
200	}
201	(void)fflush(stdout);
202	if (status == -1) {
203		/*
204		 * Error.  Report it.
205		 */
206		(void)fprintf(stderr, "%s: pcap_loop: %s\n",
207		    program_name, pcap_geterr(pd));
208	}
209	pcap_close(pd);
210	pcap_freecode(&fcode);
211	free(cmdbuf);
212	exit(status == -1 ? 1 : 0);
213}
214
215static void
216countme(u_char *user, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
217{
218	int *counterp = (int *)user;
219
220	(*counterp)++;
221}
222
223static void
224usage(void)
225{
226	(void)fprintf(stderr, "Usage: %s [ -mn ] [ -i interface ] [ -t timeout] [expression]\n",
227	    program_name);
228	exit(1);
229}
230
231/* VARARGS */
232static void
233error(const char *fmt, ...)
234{
235	va_list ap;
236
237	(void)fprintf(stderr, "%s: ", program_name);
238	va_start(ap, fmt);
239	(void)vfprintf(stderr, fmt, ap);
240	va_end(ap);
241	if (*fmt) {
242		fmt += strlen(fmt);
243		if (fmt[-1] != '\n')
244			(void)fputc('\n', stderr);
245	}
246	exit(1);
247	/* NOTREACHED */
248}
249
250/* VARARGS */
251static void
252warning(const char *fmt, ...)
253{
254	va_list ap;
255
256	(void)fprintf(stderr, "%s: WARNING: ", program_name);
257	va_start(ap, fmt);
258	(void)vfprintf(stderr, fmt, ap);
259	va_end(ap);
260	if (*fmt) {
261		fmt += strlen(fmt);
262		if (fmt[-1] != '\n')
263			(void)fputc('\n', stderr);
264	}
265}
266
267/*
268 * Copy arg vector into a new buffer, concatenating arguments with spaces.
269 */
270static char *
271copy_argv(register char **argv)
272{
273	register char **p;
274	register u_int len = 0;
275	char *buf;
276	char *src, *dst;
277
278	p = argv;
279	if (*p == 0)
280		return 0;
281
282	while (*p)
283		len += strlen(*p++) + 1;
284
285	buf = (char *)malloc(len);
286	if (buf == NULL)
287		error("copy_argv: malloc");
288
289	p = argv;
290	dst = buf;
291	while ((src = *p++) != NULL) {
292		while ((*dst++ = *src++) != '\0')
293			;
294		dst[-1] = ' ';
295	}
296	dst[-1] = '\0';
297
298	return buf;
299}
300