threadsignaltest.c revision 356341 
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 <winsock2.h>
37  #include <windows.h>
38
39  #define THREAD_HANDLE			HANDLE
40  #define THREAD_FUNC_ARG_TYPE		LPVOID
41  #define THREAD_FUNC_RETURN_TYPE	DWORD __stdcall
42
43  #include "getopt.h"
44#else
45  #include <pthread.h>
46  #include <signal.h>
47  #include <unistd.h>
48
49  #define THREAD_HANDLE			pthread_t
50  #define THREAD_FUNC_ARG_TYPE		void *
51  #define THREAD_FUNC_RETURN_TYPE	void *
52#endif
53#include <errno.h>
54#include <sys/types.h>
55
56#include <pcap.h>
57
58#include "pcap/funcattrs.h"
59
60#ifdef _WIN32
61  #include "portability.h"
62#endif
63
64static char *program_name;
65
66/* Forwards */
67static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
68static void PCAP_NORETURN usage(void);
69static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
70static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
71static char *copy_argv(char **);
72
73static pcap_t *pd;
74
75#ifdef _WIN32
76/*
77 * Generate a string for a Win32-specific error (i.e. an error generated when
78 * calling a Win32 API).
79 * For errors occurred during standard C calls, we still use pcap_strerror()
80 */
81#define ERRBUF_SIZE	1024
82static const char *
83win32_strerror(DWORD error)
84{
85  static char errbuf[ERRBUF_SIZE+1];
86  size_t errlen;
87
88  FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
89                ERRBUF_SIZE, NULL);
90
91  /*
92   * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
93   * message.  Get rid of it.
94   */
95  errlen = strlen(errbuf);
96  if (errlen >= 2) {
97    errbuf[errlen - 1] = '\0';
98    errbuf[errlen - 2] = '\0';
99    errlen -= 2;
100  }
101  return errbuf;
102}
103#else
104static void
105catch_sigusr1(int sig _U_)
106{
107	printf("Got SIGUSR1\n");
108}
109#endif
110
111static void
112sleep_secs(int secs)
113{
114#ifdef _WIN32
115	Sleep(secs*1000);
116#else
117	unsigned secs_remaining;
118
119	if (secs <= 0)
120		return;
121	secs_remaining = secs;
122	while (secs_remaining != 0)
123		secs_remaining = sleep(secs_remaining);
124#endif
125}
126
127static THREAD_FUNC_RETURN_TYPE
128capture_thread_func(THREAD_FUNC_ARG_TYPE arg)
129{
130	char *device = arg;
131	int packet_count;
132	int status;
133#ifndef _WIN32
134	struct sigaction action;
135	sigset_t mask;
136#endif
137
138#ifndef _WIN32
139	sigemptyset(&mask);
140	action.sa_handler = catch_sigusr1;
141	action.sa_mask = mask;
142	action.sa_flags = 0;
143	if (sigaction(SIGUSR1, &action, NULL) == -1)
144		error("Can't catch SIGUSR1: %s", strerror(errno));
145#endif
146
147	printf("Listening on %s\n", device);
148	for (;;) {
149		packet_count = 0;
150		status = pcap_dispatch(pd, -1, countme,
151		    (u_char *)&packet_count);
152		if (status < 0)
153			break;
154		if (status != 0) {
155			printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
156			    status, packet_count);
157		} else
158			printf("No packets seen by pcap_dispatch\n");
159	}
160	if (status == -2) {
161		/*
162		 * We got interrupted, so perhaps we didn't
163		 * manage to finish a line we were printing.
164		 * Print an extra newline, just in case.
165		 */
166		putchar('\n');
167		printf("Loop got broken\n");
168	}
169	(void)fflush(stdout);
170	if (status == -1) {
171		/*
172		 * Error.  Report it.
173		 */
174		(void)fprintf(stderr, "%s: pcap_loop: %s\n",
175		    program_name, pcap_geterr(pd));
176	}
177	return 0;
178}
179
180int
181main(int argc, char **argv)
182{
183	register int op;
184	register char *cp, *cmdbuf, *device;
185	int immediate = 0;
186	pcap_if_t *devlist;
187	bpf_u_int32 localnet, netmask;
188	struct bpf_program fcode;
189	char ebuf[PCAP_ERRBUF_SIZE];
190	int status;
191	THREAD_HANDLE capture_thread;
192#ifndef _WIN32
193	void *retval;
194#endif
195
196	device = NULL;
197	if ((cp = strrchr(argv[0], '/')) != NULL)
198		program_name = cp + 1;
199	else
200		program_name = argv[0];
201
202	opterr = 0;
203	while ((op = getopt(argc, argv, "i:")) != -1) {
204		switch (op) {
205
206		case 'i':
207			device = optarg;
208			break;
209
210		default:
211			usage();
212			/* NOTREACHED */
213		}
214	}
215
216	if (device == NULL) {
217		if (pcap_findalldevs(&devlist, ebuf) == -1)
218			error("%s", ebuf);
219		if (devlist == NULL)
220			error("no interfaces available for capture");
221		device = strdup(devlist->name);
222		pcap_freealldevs(devlist);
223	}
224	*ebuf = '\0';
225	pd = pcap_create(device, ebuf);
226	if (pd == NULL)
227		error("%s", ebuf);
228	status = pcap_set_snaplen(pd, 65535);
229	if (status != 0)
230		error("%s: pcap_set_snaplen failed: %s",
231			    device, pcap_statustostr(status));
232	if (immediate) {
233		status = pcap_set_immediate_mode(pd, 1);
234		if (status != 0)
235			error("%s: pcap_set_immediate_mode failed: %s",
236			    device, pcap_statustostr(status));
237	}
238	status = pcap_set_timeout(pd, 5*60*1000);
239	if (status != 0)
240		error("%s: pcap_set_timeout failed: %s",
241		    device, pcap_statustostr(status));
242	status = pcap_activate(pd);
243	if (status < 0) {
244		/*
245		 * pcap_activate() failed.
246		 */
247		error("%s: %s\n(%s)", device,
248		    pcap_statustostr(status), pcap_geterr(pd));
249	} else if (status > 0) {
250		/*
251		 * pcap_activate() succeeded, but it's warning us
252		 * of a problem it had.
253		 */
254		warning("%s: %s\n(%s)", device,
255		    pcap_statustostr(status), pcap_geterr(pd));
256	}
257	if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
258		localnet = 0;
259		netmask = 0;
260		warning("%s", ebuf);
261	}
262	cmdbuf = copy_argv(&argv[optind]);
263
264	if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
265		error("%s", pcap_geterr(pd));
266
267	if (pcap_setfilter(pd, &fcode) < 0)
268		error("%s", pcap_geterr(pd));
269
270#ifdef _WIN32
271	capture_thread = CreateThread(NULL, 0, capture_thread_func, device,
272	    0, NULL);
273	if (capture_thread == NULL)
274		error("Can't create capture thread: %s",
275		    win32_strerror(GetLastError()));
276#else
277	status = pthread_create(&capture_thread, NULL, capture_thread_func,
278	    device);
279	if (status != 0)
280		error("Can't create capture thread: %s", strerror(status));
281#endif
282	sleep_secs(60);
283	pcap_breakloop(pd);
284#ifdef _WIN32
285	printf("Setting event\n");
286	if (!SetEvent(pcap_getevent(pd)))
287		error("Can't set event for pcap_t: %s",
288		    win32_strerror(GetLastError()));
289	if (WaitForSingleObject(capture_thread, INFINITE) == WAIT_FAILED)
290		error("Wait for thread termination failed: %s",
291		    win32_strerror(GetLastError()));
292	CloseHandle(capture_thread);
293#else
294	printf("Sending SIGUSR1\n");
295	status = pthread_kill(capture_thread, SIGUSR1);
296	if (status != 0)
297		warning("Can't interrupt capture thread: %s", strerror(status));
298	status = pthread_join(capture_thread, &retval);
299	if (status != 0)
300		error("Wait for thread termination failed: %s",
301		    strerror(status));
302#endif
303
304	pcap_close(pd);
305	pcap_freecode(&fcode);
306	exit(status == -1 ? 1 : 0);
307}
308
309static void
310countme(u_char *user, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
311{
312	int *counterp = (int *)user;
313
314	(*counterp)++;
315}
316
317static void
318usage(void)
319{
320	(void)fprintf(stderr, "Usage: %s [ -m ] [ -i interface ] [ -t timeout] [expression]\n",
321	    program_name);
322	exit(1);
323}
324
325/* VARARGS */
326static void
327error(const char *fmt, ...)
328{
329	va_list ap;
330
331	(void)fprintf(stderr, "%s: ", program_name);
332	va_start(ap, fmt);
333	(void)vfprintf(stderr, fmt, ap);
334	va_end(ap);
335	if (*fmt) {
336		fmt += strlen(fmt);
337		if (fmt[-1] != '\n')
338			(void)fputc('\n', stderr);
339	}
340	exit(1);
341	/* NOTREACHED */
342}
343
344/* VARARGS */
345static void
346warning(const char *fmt, ...)
347{
348	va_list ap;
349
350	(void)fprintf(stderr, "%s: WARNING: ", program_name);
351	va_start(ap, fmt);
352	(void)vfprintf(stderr, fmt, ap);
353	va_end(ap);
354	if (*fmt) {
355		fmt += strlen(fmt);
356		if (fmt[-1] != '\n')
357			(void)fputc('\n', stderr);
358	}
359}
360
361/*
362 * Copy arg vector into a new buffer, concatenating arguments with spaces.
363 */
364static char *
365copy_argv(register char **argv)
366{
367	register char **p;
368	register u_int len = 0;
369	char *buf;
370	char *src, *dst;
371
372	p = argv;
373	if (*p == 0)
374		return 0;
375
376	while (*p)
377		len += strlen(*p++) + 1;
378
379	buf = (char *)malloc(len);
380	if (buf == NULL)
381		error("copy_argv: malloc");
382
383	p = argv;
384	dst = buf;
385	while ((src = *p++) != NULL) {
386		while ((*dst++ = *src++) != '\0')
387			;
388		dst[-1] = ' ';
389	}
390	dst[-1] = '\0';
391
392	return buf;
393}
394