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.
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
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.
25 static const char copyright[] _U_ =
26 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
27 The Regents of the University of California. All rights reserved.\n";
31 * Tests how select() and poll() behave on the selectable file descriptor
34 * This would be significantly different on Windows, as it'd test
35 * how WaitForMultipleObjects() would work on the event handle for a
45 #include <sys/types.h>
46 #ifdef HAVE_SYS_SELECT_H
47 #include <sys/select.h>
49 #include <sys/time.h> /* older UN*Xes */
53 #include "pcap/funcattrs.h"
55 static char *program_name;
58 static void countme(u_char *, const struct pcap_pkthdr *, const u_char *);
59 static void PCAP_NORETURN usage(void);
60 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
61 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
62 static char *copy_argv(char **);
67 main(int argc, char **argv)
70 bpf_u_int32 localnet, netmask;
71 register char *cp, *cmdbuf, *device;
72 int doselect, dopoll, dotimeout, dononblock;
73 const char *mechanism;
74 struct bpf_program fcode;
75 char ebuf[PCAP_ERRBUF_SIZE];
78 struct timeval *required_timeout;
88 if ((cp = strrchr(argv[0], '/')) != NULL)
89 program_name = cp + 1;
91 program_name = argv[0];
94 while ((op = getopt(argc, argv, "i:sptn")) != -1) {
103 mechanism = "select() and pcap_dispatch()";
108 mechanism = "poll() and pcap_dispatch()";
125 if (doselect && dopoll) {
126 fprintf(stderr, "selpolltest: choose select (-s) or poll (-p), but not both\n");
129 if (dotimeout && !doselect && !dopoll) {
130 fprintf(stderr, "selpolltest: timeout (-t) requires select (-s) or poll (-p)\n");
133 if (device == NULL) {
134 if (pcap_findalldevs(&devlist, ebuf) == -1)
137 error("no interfaces available for capture");
138 device = strdup(devlist->name);
139 pcap_freealldevs(devlist);
142 pd = pcap_open_live(device, 65535, 0, 1000, ebuf);
147 if (pcap_lookupnet(device, &localnet, &netmask, ebuf) < 0) {
152 cmdbuf = copy_argv(&argv[optind]);
154 if (pcap_compile(pd, &fcode, cmdbuf, 1, netmask) < 0)
155 error("%s", pcap_geterr(pd));
156 if (pcap_setfilter(pd, &fcode) < 0)
157 error("%s", pcap_geterr(pd));
159 if (doselect || dopoll) {
161 * We need either an FD on which to do select()/poll()
162 * or, if there isn't one, a timeout to use in select()/
165 selectable_fd = pcap_get_selectable_fd(pd);
166 if (selectable_fd == -1) {
167 printf("Listening on %s, using %s, with a timeout\n",
169 required_timeout = pcap_get_required_select_timeout(pd);
170 if (required_timeout == NULL)
171 error("select()/poll() isn't supported on %s, even with a timeout",
175 * As we won't be notified by select() or poll()
176 * that a read can be done, we'll have to periodically
177 * try reading from the device every time the required
178 * timeout expires, and we don't want those attempts
179 * to block if nothing has arrived in that interval,
180 * so we want to force non-blocking mode.
184 printf("Listening on %s, using %s\n", device,
186 required_timeout = NULL;
189 printf("Listening on %s, using pcap_dispatch()\n", device);
192 if (pcap_setnonblock(pd, 1, ebuf) == -1)
193 error("pcap_setnonblock failed: %s", ebuf);
197 fd_set setread, setexcept;
198 struct timeval seltimeout;
201 if (selectable_fd != -1) {
202 FD_SET(selectable_fd, &setread);
204 FD_SET(selectable_fd, &setexcept);
207 seltimeout.tv_sec = 0;
208 if (required_timeout != NULL &&
209 required_timeout->tv_usec < 1000)
210 seltimeout.tv_usec = required_timeout->tv_usec;
212 seltimeout.tv_usec = 1000;
213 status = select(selectable_fd + 1, &setread,
214 NULL, &setexcept, &seltimeout);
215 } else if (required_timeout != NULL) {
216 seltimeout = *required_timeout;
217 status = select(selectable_fd + 1, &setread,
218 NULL, &setexcept, &seltimeout);
220 status = select((selectable_fd == -1) ?
221 0 : selectable_fd + 1, &setread,
222 NULL, &setexcept, NULL);
225 printf("Select returns error (%s)\n",
228 if (selectable_fd == -1) {
230 printf("Select returned a descriptor\n");
233 printf("Select timed out: ");
235 printf("Select returned a descriptor: ");
236 if (FD_ISSET(selectable_fd, &setread))
237 printf("readable, ");
239 printf("not readable, ");
240 if (FD_ISSET(selectable_fd, &setexcept))
241 printf("exceptional condition\n");
243 printf("no exceptional condition\n");
246 status = pcap_dispatch(pd, -1, countme,
247 (u_char *)&packet_count);
251 * Don't report this if we're using a
252 * required timeout and we got no packets,
253 * because that could be a very short timeout,
254 * and we don't want to spam the user with
255 * a ton of "no packets" reports.
257 if (status != 0 || packet_count != 0 ||
258 required_timeout != NULL) {
259 printf("%d packets seen, %d packets counted after select returns\n",
260 status, packet_count);
269 fd.fd = selectable_fd;
273 else if (required_timeout != NULL &&
274 required_timeout->tv_usec >= 1000)
275 polltimeout = required_timeout->tv_usec/1000;
278 status = poll(&fd, (selectable_fd == -1) ? 0 : 1, polltimeout);
280 printf("Poll returns error (%s)\n",
283 if (selectable_fd == -1) {
285 printf("Poll returned a descriptor\n");
288 printf("Poll timed out\n");
290 printf("Poll returned a descriptor: ");
291 if (fd.revents & POLLIN)
292 printf("readable, ");
294 printf("not readable, ");
295 if (fd.revents & POLLERR)
296 printf("exceptional condition, ");
298 printf("no exceptional condition, ");
299 if (fd.revents & POLLHUP)
300 printf("disconnect, ");
302 printf("no disconnect, ");
303 if (fd.revents & POLLNVAL)
306 printf("not invalid\n");
310 status = pcap_dispatch(pd, -1, countme,
311 (u_char *)&packet_count);
315 * Don't report this if we're using a
316 * required timeout and we got no packets,
317 * because that could be a very short timeout,
318 * and we don't want to spam the user with
319 * a ton of "no packets" reports.
321 if (status != 0 || packet_count != 0 ||
322 required_timeout != NULL) {
323 printf("%d packets seen, %d packets counted after poll returns\n",
324 status, packet_count);
331 status = pcap_dispatch(pd, -1, countme,
332 (u_char *)&packet_count);
335 printf("%d packets seen, %d packets counted after pcap_dispatch returns\n",
336 status, packet_count);
341 * We got interrupted, so perhaps we didn't
342 * manage to finish a line we were printing.
343 * Print an extra newline, just in case.
347 (void)fflush(stdout);
352 (void)fprintf(stderr, "%s: pcap_loop: %s\n",
353 program_name, pcap_geterr(pd));
356 exit(status == -1 ? 1 : 0);
360 countme(u_char *user, const struct pcap_pkthdr *h _U_, const u_char *sp _U_)
362 int *counterp = (int *)user;
370 (void)fprintf(stderr, "Usage: %s [ -sptn ] [ -i interface ] [expression]\n",
377 error(const char *fmt, ...)
381 (void)fprintf(stderr, "%s: ", program_name);
383 (void)vfprintf(stderr, fmt, ap);
388 (void)fputc('\n', stderr);
396 warning(const char *fmt, ...)
400 (void)fprintf(stderr, "%s: WARNING: ", program_name);
402 (void)vfprintf(stderr, fmt, ap);
407 (void)fputc('\n', stderr);
412 * Copy arg vector into a new buffer, concatenating arguments with spaces.
415 copy_argv(register char **argv)
418 register u_int len = 0;
427 len += strlen(*p++) + 1;
429 buf = (char *)malloc(len);
431 error("copy_argv: malloc");
435 while ((src = *p++) != NULL) {
436 while ((*dst++ = *src++) != '\0')