1 /*
2 * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 #include "../util-internal.h"
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <assert.h>
32 #include <math.h>
33
34 #ifdef _WIN32
35 #include <winsock2.h>
36 #include <ws2tcpip.h>
37 #else
38 #include <sys/socket.h>
39 #include <netinet/in.h>
40 # ifdef _XOPEN_SOURCE_EXTENDED
41 # include <arpa/inet.h>
42 # endif
43 #endif
44 #include <signal.h>
45
46 #include "event2/bufferevent.h"
47 #include "event2/buffer.h"
48 #include "event2/event.h"
49 #include "event2/util.h"
50 #include "event2/listener.h"
51 #include "event2/thread.h"
52
53 #ifndef MIN
54 #define MIN(a,b) (((a)<(b))?(a):(b))
55 #endif
56
57 static struct evutil_weakrand_state weakrand_state;
58
59 static int cfg_verbose = 0;
60 static int cfg_help = 0;
61
62 static int cfg_n_connections = 30;
63 static int cfg_duration = 5;
64 static int cfg_connlimit = 0;
65 static int cfg_grouplimit = 0;
66 static int cfg_tick_msec = 1000;
67 static int cfg_min_share = -1;
68 static int cfg_group_drain = 0;
69
70 static int cfg_connlimit_tolerance = -1;
71 static int cfg_grouplimit_tolerance = -1;
72 static int cfg_stddev_tolerance = -1;
73
74 #ifdef _WIN32
75 static int cfg_enable_iocp = 0;
76 #endif
77
78 static struct timeval cfg_tick = { 0, 500*1000 };
79
80 static struct ev_token_bucket_cfg *conn_bucket_cfg = NULL;
81 static struct ev_token_bucket_cfg *group_bucket_cfg = NULL;
82 struct bufferevent_rate_limit_group *ratelim_group = NULL;
83 static double seconds_per_tick = 0.0;
84
85 struct client_state {
86 size_t queued;
87 ev_uint64_t received;
88
89 };
90 static const struct timeval *ms100_common=NULL;
91
92 /* Timers bias for slow CPUs, affects:
93 * - cfg_connlimit_tolerance (--check-connlimit)
94 * - cfg_grouplimit_tolerance (--check-grouplimit)
95 * - cfg_stddev_tolerance (--check-stddev)
96 */
97 static int timer_bias_events;
98 static struct timeval timer_bias_start;
99 double timer_bias_spend;
100 /* Real cost is less (approximately ~5 usec),
101 * this macros adjusted to make the bias less */
102 #define TIMER_MAX_COST_USEC 10
103
104 /* info from check_bucket_levels_cb */
105 static int total_n_bev_checks = 0;
106 static ev_int64_t total_rbucket_level=0;
107 static ev_int64_t total_wbucket_level=0;
108 static ev_int64_t total_max_to_read=0;
109 static ev_int64_t total_max_to_write=0;
110 static ev_int64_t max_bucket_level=EV_INT64_MIN;
111 static ev_int64_t min_bucket_level=EV_INT64_MAX;
112
113 /* from check_group_bucket_levels_cb */
114 static int total_n_group_bev_checks = 0;
115 static ev_int64_t total_group_rbucket_level = 0;
116 static ev_int64_t total_group_wbucket_level = 0;
117
118 static int n_echo_conns_open = 0;
119
120 /* Info on the open connections */
121 struct bufferevent **bevs;
122 struct client_state *states;
123 struct bufferevent_rate_limit_group *group = NULL;
124
125 static void check_bucket_levels_cb(evutil_socket_t fd, short events, void *arg);
126
127 static void
loud_writecb(struct bufferevent * bev,void * ctx)128 loud_writecb(struct bufferevent *bev, void *ctx)
129 {
130 struct client_state *cs = ctx;
131 struct evbuffer *output = bufferevent_get_output(bev);
132 char buf[1024];
133 int r = evutil_weakrand_(&weakrand_state);
134 memset(buf, r, sizeof(buf));
135 while (evbuffer_get_length(output) < 8192) {
136 evbuffer_add(output, buf, sizeof(buf));
137 cs->queued += sizeof(buf);
138 }
139 }
140
141 static void
discard_readcb(struct bufferevent * bev,void * ctx)142 discard_readcb(struct bufferevent *bev, void *ctx)
143 {
144 struct client_state *cs = ctx;
145 struct evbuffer *input = bufferevent_get_input(bev);
146 size_t len = evbuffer_get_length(input);
147 evbuffer_drain(input, len);
148 cs->received += len;
149 }
150
151 static void
write_on_connectedcb(struct bufferevent * bev,short what,void * ctx)152 write_on_connectedcb(struct bufferevent *bev, short what, void *ctx)
153 {
154 if (what & BEV_EVENT_CONNECTED) {
155 loud_writecb(bev, ctx);
156 /* XXXX this shouldn't be needed. */
157 bufferevent_enable(bev, EV_READ|EV_WRITE);
158 }
159 }
160
161 static void
echo_readcb(struct bufferevent * bev,void * ctx)162 echo_readcb(struct bufferevent *bev, void *ctx)
163 {
164 struct evbuffer *input = bufferevent_get_input(bev);
165 struct evbuffer *output = bufferevent_get_output(bev);
166
167 evbuffer_add_buffer(output, input);
168 if (evbuffer_get_length(output) > 1024000)
169 bufferevent_disable(bev, EV_READ);
170 }
171
172 static void
echo_writecb(struct bufferevent * bev,void * ctx)173 echo_writecb(struct bufferevent *bev, void *ctx)
174 {
175 struct evbuffer *output = bufferevent_get_output(bev);
176 if (evbuffer_get_length(output) < 512000)
177 bufferevent_enable(bev, EV_READ);
178 }
179
180 static void
echo_eventcb(struct bufferevent * bev,short what,void * ctx)181 echo_eventcb(struct bufferevent *bev, short what, void *ctx)
182 {
183 if (what & (BEV_EVENT_EOF|BEV_EVENT_ERROR)) {
184 --n_echo_conns_open;
185 bufferevent_free(bev);
186 }
187 }
188
189 static void
echo_listenercb(struct evconnlistener * listener,evutil_socket_t newsock,struct sockaddr * sourceaddr,int socklen,void * ctx)190 echo_listenercb(struct evconnlistener *listener, evutil_socket_t newsock,
191 struct sockaddr *sourceaddr, int socklen, void *ctx)
192 {
193 struct event_base *base = ctx;
194 int flags = BEV_OPT_CLOSE_ON_FREE|BEV_OPT_THREADSAFE;
195 struct bufferevent *bev;
196
197 bev = bufferevent_socket_new(base, newsock, flags);
198 bufferevent_setcb(bev, echo_readcb, echo_writecb, echo_eventcb, NULL);
199 if (conn_bucket_cfg) {
200 struct event *check_event =
201 event_new(base, -1, EV_PERSIST, check_bucket_levels_cb, bev);
202 bufferevent_set_rate_limit(bev, conn_bucket_cfg);
203
204 assert(bufferevent_get_token_bucket_cfg(bev) != NULL);
205 event_add(check_event, ms100_common);
206 }
207 if (ratelim_group)
208 bufferevent_add_to_rate_limit_group(bev, ratelim_group);
209 ++n_echo_conns_open;
210 bufferevent_enable(bev, EV_READ|EV_WRITE);
211 }
212
213 /* Called periodically to check up on how full the buckets are */
214 static void
check_bucket_levels_cb(evutil_socket_t fd,short events,void * arg)215 check_bucket_levels_cb(evutil_socket_t fd, short events, void *arg)
216 {
217 struct bufferevent *bev = arg;
218
219 ev_ssize_t r = bufferevent_get_read_limit(bev);
220 ev_ssize_t w = bufferevent_get_write_limit(bev);
221 ev_ssize_t rm = bufferevent_get_max_to_read(bev);
222 ev_ssize_t wm = bufferevent_get_max_to_write(bev);
223 /* XXXX check that no value is above the cofigured burst
224 * limit */
225 total_rbucket_level += r;
226 total_wbucket_level += w;
227 total_max_to_read += rm;
228 total_max_to_write += wm;
229 #define B(x) \
230 if ((x) > max_bucket_level) \
231 max_bucket_level = (x); \
232 if ((x) < min_bucket_level) \
233 min_bucket_level = (x)
234 B(r);
235 B(w);
236 #undef B
237
238 total_n_bev_checks++;
239 if (total_n_bev_checks >= .8 * ((double)cfg_duration / cfg_tick_msec) * cfg_n_connections) {
240 event_free(event_base_get_running_event(bufferevent_get_base(bev)));
241 }
242 }
243
244 static void
check_group_bucket_levels_cb(evutil_socket_t fd,short events,void * arg)245 check_group_bucket_levels_cb(evutil_socket_t fd, short events, void *arg)
246 {
247 if (ratelim_group) {
248 ev_ssize_t r = bufferevent_rate_limit_group_get_read_limit(ratelim_group);
249 ev_ssize_t w = bufferevent_rate_limit_group_get_write_limit(ratelim_group);
250 total_group_rbucket_level += r;
251 total_group_wbucket_level += w;
252 }
253 ++total_n_group_bev_checks;
254 }
255
256 static void
group_drain_cb(evutil_socket_t fd,short events,void * arg)257 group_drain_cb(evutil_socket_t fd, short events, void *arg)
258 {
259 bufferevent_rate_limit_group_decrement_read(ratelim_group, cfg_group_drain);
260 bufferevent_rate_limit_group_decrement_write(ratelim_group, cfg_group_drain);
261 }
262
263 static void
timer_bias_cb(evutil_socket_t fd,short events,void * arg)264 timer_bias_cb(evutil_socket_t fd, short events, void *arg)
265 {
266 struct event *event = arg;
267 struct timeval end;
268 struct timeval diff;
269
270 /** XXX: use rdtsc? (portability issues?) */
271 evutil_gettimeofday(&end, NULL);
272 evutil_timersub(&end, &timer_bias_start, &diff);
273 timer_bias_spend += diff.tv_sec + diff.tv_usec * 1e6;
274 timer_bias_start = end;
275
276 if (++timer_bias_events == 100)
277 event_del(event);
278 }
279 static double
timer_bias_calculate(void)280 timer_bias_calculate(void)
281 {
282 struct event_config *cfg = NULL;
283 struct event_base *base = NULL;
284 struct event *timer = NULL;
285 struct timeval tv = { 0, 1 };
286 int done = 0;
287
288 cfg = event_config_new();
289 if (!cfg)
290 goto err;
291 if (event_config_set_flag(cfg, EVENT_BASE_FLAG_PRECISE_TIMER))
292 goto err;
293 base = event_base_new_with_config(cfg);
294 if (!base)
295 goto err;
296
297 timer = event_new(base, -1, EV_PERSIST, timer_bias_cb, event_self_cbarg());
298 if (!timer || event_add(timer, &tv)) {
299 goto err;
300 }
301
302 evutil_gettimeofday(&timer_bias_start, NULL);
303 event_base_dispatch(base);
304 done = 1;
305
306 err:
307 if (cfg)
308 event_config_free(cfg);
309 if (timer)
310 event_free(timer);
311 if (base)
312 event_base_free(base);
313
314 if (done)
315 return MIN(timer_bias_spend / 1e6 / timer_bias_events / TIMER_MAX_COST_USEC, 5);
316
317 fprintf(stderr, "Couldn't create event for CPU cycle counter bias\n");
318 return -1;
319 }
320
321 static int
test_ratelimiting(void)322 test_ratelimiting(void)
323 {
324 struct event_base *base;
325 struct sockaddr_in sin;
326 struct evconnlistener *listener;
327
328 struct sockaddr_storage ss;
329 ev_socklen_t slen;
330
331 int i;
332
333 struct timeval tv;
334
335 ev_uint64_t total_received;
336 double total_sq_persec, total_persec;
337 double variance;
338 double expected_total_persec = -1.0, expected_avg_persec = -1.0;
339 int ok = 1;
340 struct event_config *base_cfg;
341 struct event *periodic_level_check;
342 struct event *group_drain_event=NULL;
343 double timer_bias;
344
345 memset(&sin, 0, sizeof(sin));
346 sin.sin_family = AF_INET;
347 sin.sin_addr.s_addr = htonl(0x7f000001); /* 127.0.0.1 */
348 sin.sin_port = 0; /* unspecified port */
349
350 if (0)
351 event_enable_debug_mode();
352
353 timer_bias = timer_bias_calculate();
354 if (timer_bias > 1) {
355 fprintf(stderr, "CPU is slow, timers bias is %f\n", timer_bias);
356 cfg_connlimit_tolerance *= timer_bias;
357 cfg_grouplimit_tolerance *= timer_bias;
358 cfg_stddev_tolerance *= timer_bias;
359 } else {
360 printf("CPU is fast enough, timers bias is %f\n", timer_bias);
361 }
362
363 base_cfg = event_config_new();
364
365 #ifdef _WIN32
366 if (cfg_enable_iocp) {
367 #ifdef EVTHREAD_USE_WINDOWS_THREADS_IMPLEMENTED
368 evthread_use_windows_threads();
369 #endif
370 event_config_set_flag(base_cfg, EVENT_BASE_FLAG_STARTUP_IOCP);
371 }
372 #endif
373
374 base = event_base_new_with_config(base_cfg);
375 event_config_free(base_cfg);
376 if (! base) {
377 fprintf(stderr, "Couldn't create event_base");
378 return 1;
379 }
380
381 listener = evconnlistener_new_bind(base, echo_listenercb, base,
382 LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE, -1,
383 (struct sockaddr *)&sin, sizeof(sin));
384 if (! listener) {
385 fprintf(stderr, "Couldn't create listener");
386 return 1;
387 }
388
389 slen = sizeof(ss);
390 if (getsockname(evconnlistener_get_fd(listener), (struct sockaddr *)&ss,
391 &slen) < 0) {
392 perror("getsockname");
393 return 1;
394 }
395
396 if (cfg_connlimit > 0) {
397 conn_bucket_cfg = ev_token_bucket_cfg_new(
398 cfg_connlimit, cfg_connlimit * 4,
399 cfg_connlimit, cfg_connlimit * 4,
400 &cfg_tick);
401 assert(conn_bucket_cfg);
402 }
403
404 if (cfg_grouplimit > 0) {
405 group_bucket_cfg = ev_token_bucket_cfg_new(
406 cfg_grouplimit, cfg_grouplimit * 4,
407 cfg_grouplimit, cfg_grouplimit * 4,
408 &cfg_tick);
409 group = ratelim_group = bufferevent_rate_limit_group_new(
410 base, group_bucket_cfg);
411 expected_total_persec = cfg_grouplimit - (cfg_group_drain / seconds_per_tick);
412 expected_avg_persec = cfg_grouplimit / cfg_n_connections;
413 if (cfg_connlimit > 0 && expected_avg_persec > cfg_connlimit)
414 expected_avg_persec = cfg_connlimit;
415 if (cfg_min_share >= 0)
416 bufferevent_rate_limit_group_set_min_share(
417 ratelim_group, cfg_min_share);
418 }
419
420 if (expected_avg_persec < 0 && cfg_connlimit > 0)
421 expected_avg_persec = cfg_connlimit;
422
423 if (expected_avg_persec > 0)
424 expected_avg_persec /= seconds_per_tick;
425 if (expected_total_persec > 0)
426 expected_total_persec /= seconds_per_tick;
427
428 bevs = calloc(cfg_n_connections, sizeof(struct bufferevent *));
429 states = calloc(cfg_n_connections, sizeof(struct client_state));
430
431 for (i = 0; i < cfg_n_connections; ++i) {
432 bevs[i] = bufferevent_socket_new(base, -1,
433 BEV_OPT_CLOSE_ON_FREE|BEV_OPT_THREADSAFE);
434 assert(bevs[i]);
435 bufferevent_setcb(bevs[i], discard_readcb, loud_writecb,
436 write_on_connectedcb, &states[i]);
437 bufferevent_enable(bevs[i], EV_READ|EV_WRITE);
438 bufferevent_socket_connect(bevs[i], (struct sockaddr *)&ss,
439 slen);
440 }
441
442 tv.tv_sec = cfg_duration - 1;
443 tv.tv_usec = 995000;
444
445 event_base_loopexit(base, &tv);
446
447 tv.tv_sec = 0;
448 tv.tv_usec = 100*1000;
449 ms100_common = event_base_init_common_timeout(base, &tv);
450
451 periodic_level_check = event_new(base, -1, EV_PERSIST, check_group_bucket_levels_cb, NULL);
452 event_add(periodic_level_check, ms100_common);
453
454 if (cfg_group_drain && ratelim_group) {
455 group_drain_event = event_new(base, -1, EV_PERSIST, group_drain_cb, NULL);
456 event_add(group_drain_event, &cfg_tick);
457 }
458
459 event_base_dispatch(base);
460
461 ratelim_group = NULL; /* So no more responders get added */
462 event_free(periodic_level_check);
463 if (group_drain_event)
464 event_free(group_drain_event);
465
466 for (i = 0; i < cfg_n_connections; ++i) {
467 bufferevent_free(bevs[i]);
468 }
469 evconnlistener_free(listener);
470
471 /* Make sure no new echo_conns get added to the group. */
472 ratelim_group = NULL;
473
474 /* This should get _everybody_ freed */
475 while (n_echo_conns_open) {
476 printf("waiting for %d conns\n", n_echo_conns_open);
477 tv.tv_sec = 0;
478 tv.tv_usec = 300000;
479 event_base_loopexit(base, &tv);
480 event_base_dispatch(base);
481 }
482
483 if (group)
484 bufferevent_rate_limit_group_free(group);
485
486 if (total_n_bev_checks) {
487 printf("Average read bucket level: %f\n",
488 (double)total_rbucket_level/total_n_bev_checks);
489 printf("Average write bucket level: %f\n",
490 (double)total_wbucket_level/total_n_bev_checks);
491 printf("Highest read bucket level: %f\n",
492 (double)max_bucket_level);
493 printf("Highest write bucket level: %f\n",
494 (double)min_bucket_level);
495 printf("Average max-to-read: %f\n",
496 ((double)total_max_to_read)/total_n_bev_checks);
497 printf("Average max-to-write: %f\n",
498 ((double)total_max_to_write)/total_n_bev_checks);
499 }
500 if (total_n_group_bev_checks) {
501 printf("Average group read bucket level: %f\n",
502 ((double)total_group_rbucket_level)/total_n_group_bev_checks);
503 printf("Average group write bucket level: %f\n",
504 ((double)total_group_wbucket_level)/total_n_group_bev_checks);
505 }
506
507 total_received = 0;
508 total_persec = 0.0;
509 total_sq_persec = 0.0;
510 for (i=0; i < cfg_n_connections; ++i) {
511 double persec = states[i].received;
512 persec /= cfg_duration;
513 total_received += states[i].received;
514 total_persec += persec;
515 total_sq_persec += persec*persec;
516 printf("%d: %f per second\n", i+1, persec);
517 }
518 printf(" total: %f per second\n",
519 ((double)total_received)/cfg_duration);
520 if (expected_total_persec > 0) {
521 double diff = expected_total_persec -
522 ((double)total_received/cfg_duration);
523 printf(" [Off by %lf]\n", diff);
524 if (cfg_grouplimit_tolerance > 0 &&
525 fabs(diff) > cfg_grouplimit_tolerance) {
526 fprintf(stderr, "Group bandwidth out of bounds\n");
527 ok = 0;
528 }
529 }
530
531 printf(" average: %f per second\n",
532 (((double)total_received)/cfg_duration)/cfg_n_connections);
533 if (expected_avg_persec > 0) {
534 double diff = expected_avg_persec - (((double)total_received)/cfg_duration)/cfg_n_connections;
535 printf(" [Off by %lf]\n", diff);
536 if (cfg_connlimit_tolerance > 0 &&
537 fabs(diff) > cfg_connlimit_tolerance) {
538 fprintf(stderr, "Connection bandwidth out of bounds\n");
539 ok = 0;
540 }
541 }
542
543 variance = total_sq_persec/cfg_n_connections - total_persec*total_persec/(cfg_n_connections*cfg_n_connections);
544
545 printf(" stddev: %f per second\n", sqrt(variance));
546 if (cfg_stddev_tolerance > 0 &&
547 sqrt(variance) > cfg_stddev_tolerance) {
548 fprintf(stderr, "Connection variance out of bounds\n");
549 ok = 0;
550 }
551
552 event_base_free(base);
553 free(bevs);
554 free(states);
555
556 return ok ? 0 : 1;
557 }
558
559 static struct option {
560 const char *name; int *ptr; int min; int isbool;
561 } options[] = {
562 { "-v", &cfg_verbose, 0, 1 },
563 { "-h", &cfg_help, 0, 1 },
564 { "-n", &cfg_n_connections, 1, 0 },
565 { "-d", &cfg_duration, 1, 0 },
566 { "-c", &cfg_connlimit, 0, 0 },
567 { "-g", &cfg_grouplimit, 0, 0 },
568 { "-G", &cfg_group_drain, -100000, 0 },
569 { "-t", &cfg_tick_msec, 10, 0 },
570 { "--min-share", &cfg_min_share, 0, 0 },
571 { "--check-connlimit", &cfg_connlimit_tolerance, 0, 0 },
572 { "--check-grouplimit", &cfg_grouplimit_tolerance, 0, 0 },
573 { "--check-stddev", &cfg_stddev_tolerance, 0, 0 },
574 #ifdef _WIN32
575 { "--iocp", &cfg_enable_iocp, 0, 1 },
576 #endif
577 { NULL, NULL, -1, 0 },
578 };
579
580 static int
handle_option(int argc,char ** argv,int * i,const struct option * opt)581 handle_option(int argc, char **argv, int *i, const struct option *opt)
582 {
583 long val;
584 char *endptr = NULL;
585 if (opt->isbool) {
586 *opt->ptr = 1;
587 return 0;
588 }
589 if (*i + 1 == argc) {
590 fprintf(stderr, "Too few arguments to '%s'\n",argv[*i]);
591 return -1;
592 }
593 val = strtol(argv[*i+1], &endptr, 10);
594 if (*argv[*i+1] == '\0' || !endptr || *endptr != '\0') {
595 fprintf(stderr, "Couldn't parse numeric value '%s'\n",
596 argv[*i+1]);
597 return -1;
598 }
599 if (val < opt->min || val > 0x7fffffff) {
600 fprintf(stderr, "Value '%s' is out-of-range'\n",
601 argv[*i+1]);
602 return -1;
603 }
604 *opt->ptr = (int)val;
605 ++*i;
606 return 0;
607 }
608
609 static void
usage(void)610 usage(void)
611 {
612 fprintf(stderr,
613 "test-ratelim [-v] [-n INT] [-d INT] [-c INT] [-g INT] [-t INT]\n\n"
614 "Pushes bytes through a number of possibly rate-limited connections, and\n"
615 "displays average throughput.\n\n"
616 " -n INT: Number of connections to open (default: 30)\n"
617 " -d INT: Duration of the test in seconds (default: 5 sec)\n");
618 fprintf(stderr,
619 " -c INT: Connection-rate limit applied to each connection in bytes per second\n"
620 " (default: None.)\n"
621 " -g INT: Group-rate limit applied to sum of all usage in bytes per second\n"
622 " (default: None.)\n"
623 " -G INT: drain INT bytes from the group limit every tick. (default: 0)\n"
624 " -t INT: Granularity of timing, in milliseconds (default: 1000 msec)\n");
625 }
626
627 int
main(int argc,char ** argv)628 main(int argc, char **argv)
629 {
630 int i,j;
631 double ratio;
632
633 #ifdef _WIN32
634 WORD wVersionRequested = MAKEWORD(2,2);
635 WSADATA wsaData;
636
637 (void) WSAStartup(wVersionRequested, &wsaData);
638 #endif
639
640 evutil_weakrand_seed_(&weakrand_state, 0);
641
642 #ifndef _WIN32
643 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
644 return 1;
645 #endif
646 for (i = 1; i < argc; ++i) {
647 for (j = 0; options[j].name; ++j) {
648 if (!strcmp(argv[i],options[j].name)) {
649 if (handle_option(argc,argv,&i,&options[j])<0)
650 return 1;
651 goto again;
652 }
653 }
654 fprintf(stderr, "Unknown option '%s'\n", argv[i]);
655 usage();
656 return 1;
657 again:
658 ;
659 }
660 if (cfg_help) {
661 usage();
662 return 0;
663 }
664
665 cfg_tick.tv_sec = cfg_tick_msec / 1000;
666 cfg_tick.tv_usec = (cfg_tick_msec % 1000)*1000;
667
668 seconds_per_tick = ratio = cfg_tick_msec / 1000.0;
669
670 cfg_connlimit *= ratio;
671 cfg_grouplimit *= ratio;
672
673 {
674 struct timeval tv;
675 evutil_gettimeofday(&tv, NULL);
676 #ifdef _WIN32
677 srand(tv.tv_usec);
678 #else
679 srandom(tv.tv_usec);
680 #endif
681 }
682
683 #ifndef EVENT__DISABLE_THREAD_SUPPORT
684 evthread_enable_lock_debugging();
685 #endif
686
687 return test_ratelimiting();
688 }
689