1: /*
2: * iperf, Copyright (c) 2014-2020 The Regents of the University of
3: * California, through Lawrence Berkeley National Laboratory (subject
4: * to receipt of any required approvals from the U.S. Dept. of
5: * Energy). All rights reserved.
6: *
7: * If you have questions about your rights to use or distribute this
8: * software, please contact Berkeley Lab's Technology Transfer
9: * Department at TTD@lbl.gov.
10: *
11: * NOTICE. This software is owned by the U.S. Department of Energy.
12: * As such, the U.S. Government has been granted for itself and others
13: * acting on its behalf a paid-up, nonexclusive, irrevocable,
14: * worldwide license in the Software to reproduce, prepare derivative
15: * works, and perform publicly and display publicly. Beginning five
16: * (5) years after the date permission to assert copyright is obtained
17: * from the U.S. Department of Energy, and subject to any subsequent
18: * five (5) year renewals, the U.S. Government is granted for itself
19: * and others acting on its behalf a paid-up, nonexclusive,
20: * irrevocable, worldwide license in the Software to reproduce,
21: * prepare derivative works, distribute copies to the public, perform
22: * publicly and display publicly, and to permit others to do so.
23: *
24: * This code is distributed under a BSD style license, see the LICENSE
25: * file for complete information.
26: */
27: /* iperf_server_api.c: Functions to be used by an iperf server
28: */
29:
30: #include <stdio.h>
31: #include <stdlib.h>
32: #include <string.h>
33: #include <getopt.h>
34: #include <errno.h>
35: #include <unistd.h>
36: #include <assert.h>
37: #include <fcntl.h>
38: #include <sys/socket.h>
39: #include <sys/types.h>
40: #include <netinet/in.h>
41: #include <arpa/inet.h>
42: #include <netdb.h>
43: #ifdef HAVE_STDINT_H
44: #include <stdint.h>
45: #endif
46: #include <sys/time.h>
47: #include <sys/resource.h>
48: #include <sched.h>
49: #include <setjmp.h>
50:
51: #include "iperf.h"
52: #include "iperf_api.h"
53: #include "iperf_udp.h"
54: #include "iperf_tcp.h"
55: #include "iperf_util.h"
56: #include "timer.h"
57: #include "iperf_time.h"
58: #include "net.h"
59: #include "units.h"
60: #include "iperf_util.h"
61: #include "iperf_locale.h"
62:
63: #if defined(HAVE_TCP_CONGESTION)
64: #if !defined(TCP_CA_NAME_MAX)
65: #define TCP_CA_NAME_MAX 16
66: #endif /* TCP_CA_NAME_MAX */
67: #endif /* HAVE_TCP_CONGESTION */
68:
69: int
70: iperf_server_listen(struct iperf_test *test)
71: {
72: retry:
73: if((test->listener = netannounce(test->settings->domain, Ptcp, test->bind_address, test->server_port)) < 0) {
74: if (errno == EAFNOSUPPORT && (test->settings->domain == AF_INET6 || test->settings->domain == AF_UNSPEC)) {
75: /* If we get "Address family not supported by protocol", that
76: ** probably means we were compiled with IPv6 but the running
77: ** kernel does not actually do IPv6. This is not too unusual,
78: ** v6 support is and perhaps always will be spotty.
79: */
80: warning("this system does not seem to support IPv6 - trying IPv4");
81: test->settings->domain = AF_INET;
82: goto retry;
83: } else {
84: i_errno = IELISTEN;
85: return -1;
86: }
87: }
88:
89: if (!test->json_output) {
90: iperf_printf(test, "-----------------------------------------------------------\n");
91: iperf_printf(test, "Server listening on %d\n", test->server_port);
92: iperf_printf(test, "-----------------------------------------------------------\n");
93: if (test->forceflush)
94: iflush(test);
95: }
96:
97: FD_ZERO(&test->read_set);
98: FD_ZERO(&test->write_set);
99: FD_SET(test->listener, &test->read_set);
100: if (test->listener > test->max_fd) test->max_fd = test->listener;
101:
102: return 0;
103: }
104:
105: int
106: iperf_accept(struct iperf_test *test)
107: {
108: int s;
109: signed char rbuf = ACCESS_DENIED;
110: socklen_t len;
111: struct sockaddr_storage addr;
112:
113: len = sizeof(addr);
114: if ((s = accept(test->listener, (struct sockaddr *) &addr, &len)) < 0) {
115: i_errno = IEACCEPT;
116: return -1;
117: }
118:
119: if (test->ctrl_sck == -1) {
120: /* Server free, accept new client */
121: test->ctrl_sck = s;
122: if (Nread(test->ctrl_sck, test->cookie, COOKIE_SIZE, Ptcp) < 0) {
123: i_errno = IERECVCOOKIE;
124: return -1;
125: }
126: FD_SET(test->ctrl_sck, &test->read_set);
127: if (test->ctrl_sck > test->max_fd) test->max_fd = test->ctrl_sck;
128:
129: if (iperf_set_send_state(test, PARAM_EXCHANGE) != 0)
130: return -1;
131: if (iperf_exchange_parameters(test) < 0)
132: return -1;
133: if (test->server_affinity != -1)
134: if (iperf_setaffinity(test, test->server_affinity) != 0)
135: return -1;
136: if (test->on_connect)
137: test->on_connect(test);
138: } else {
139: /*
140: * Don't try to read from the socket. It could block an ongoing test.
141: * Just send ACCESS_DENIED.
142: */
143: if (Nwrite(s, (char*) &rbuf, sizeof(rbuf), Ptcp) < 0) {
144: i_errno = IESENDMESSAGE;
145: return -1;
146: }
147: close(s);
148: }
149:
150: return 0;
151: }
152:
153:
154: /**************************************************************************/
155: int
156: iperf_handle_message_server(struct iperf_test *test)
157: {
158: int rval;
159: struct iperf_stream *sp;
160:
161: // XXX: Need to rethink how this behaves to fit API
162: if ((rval = Nread(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp)) <= 0) {
163: if (rval == 0) {
164: iperf_err(test, "the client has unexpectedly closed the connection");
165: i_errno = IECTRLCLOSE;
166: test->state = IPERF_DONE;
167: return 0;
168: } else {
169: i_errno = IERECVMESSAGE;
170: return -1;
171: }
172: }
173:
174: switch(test->state) {
175: case TEST_START:
176: break;
177: case TEST_END:
178: test->done = 1;
179: cpu_util(test->cpu_util);
180: test->stats_callback(test);
181: SLIST_FOREACH(sp, &test->streams, streams) {
182: FD_CLR(sp->socket, &test->read_set);
183: FD_CLR(sp->socket, &test->write_set);
184: close(sp->socket);
185: }
186: test->reporter_callback(test);
187: if (iperf_set_send_state(test, EXCHANGE_RESULTS) != 0)
188: return -1;
189: if (iperf_exchange_results(test) < 0)
190: return -1;
191: if (iperf_set_send_state(test, DISPLAY_RESULTS) != 0)
192: return -1;
193: if (test->on_test_finish)
194: test->on_test_finish(test);
195: break;
196: case IPERF_DONE:
197: break;
198: case CLIENT_TERMINATE:
199: i_errno = IECLIENTTERM;
200:
201: // Temporarily be in DISPLAY_RESULTS phase so we can get
202: // ending summary statistics.
203: signed char oldstate = test->state;
204: cpu_util(test->cpu_util);
205: test->state = DISPLAY_RESULTS;
206: test->reporter_callback(test);
207: test->state = oldstate;
208:
209: // XXX: Remove this line below!
210: iperf_err(test, "the client has terminated");
211: SLIST_FOREACH(sp, &test->streams, streams) {
212: FD_CLR(sp->socket, &test->read_set);
213: FD_CLR(sp->socket, &test->write_set);
214: close(sp->socket);
215: }
216: test->state = IPERF_DONE;
217: break;
218: default:
219: i_errno = IEMESSAGE;
220: return -1;
221: }
222:
223: return 0;
224: }
225:
226: static void
227: server_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
228: {
229: struct iperf_test *test = client_data.p;
230: struct iperf_stream *sp;
231:
232: test->timer = NULL;
233: if (test->done)
234: return;
235: test->done = 1;
236: /* Free streams */
237: while (!SLIST_EMPTY(&test->streams)) {
238: sp = SLIST_FIRST(&test->streams);
239: SLIST_REMOVE_HEAD(&test->streams, streams);
240: close(sp->socket);
241: iperf_free_stream(sp);
242: }
243: close(test->ctrl_sck);
244: }
245:
246: static void
247: server_stats_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
248: {
249: struct iperf_test *test = client_data.p;
250:
251: if (test->done)
252: return;
253: if (test->stats_callback)
254: test->stats_callback(test);
255: }
256:
257: static void
258: server_reporter_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
259: {
260: struct iperf_test *test = client_data.p;
261:
262: if (test->done)
263: return;
264: if (test->reporter_callback)
265: test->reporter_callback(test);
266: }
267:
268: static int
269: create_server_timers(struct iperf_test * test)
270: {
271: struct iperf_time now;
272: TimerClientData cd;
273: int max_rtt = 4; /* seconds */
274: int state_transitions = 10; /* number of state transitions in iperf3 */
275: int grace_period = max_rtt * state_transitions;
276:
277: if (iperf_time_now(&now) < 0) {
278: i_errno = IEINITTEST;
279: return -1;
280: }
281: cd.p = test;
282: test->timer = test->stats_timer = test->reporter_timer = NULL;
283: if (test->duration != 0 ) {
284: test->done = 0;
285: test->timer = tmr_create(&now, server_timer_proc, cd, (test->duration + test->omit + grace_period) * SEC_TO_US, 0);
286: if (test->timer == NULL) {
287: i_errno = IEINITTEST;
288: return -1;
289: }
290: }
291:
292: test->stats_timer = test->reporter_timer = NULL;
293: if (test->stats_interval != 0) {
294: test->stats_timer = tmr_create(&now, server_stats_timer_proc, cd, test->stats_interval * SEC_TO_US, 1);
295: if (test->stats_timer == NULL) {
296: i_errno = IEINITTEST;
297: return -1;
298: }
299: }
300: if (test->reporter_interval != 0) {
301: test->reporter_timer = tmr_create(&now, server_reporter_timer_proc, cd, test->reporter_interval * SEC_TO_US, 1);
302: if (test->reporter_timer == NULL) {
303: i_errno = IEINITTEST;
304: return -1;
305: }
306: }
307: return 0;
308: }
309:
310: static void
311: server_omit_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
312: {
313: struct iperf_test *test = client_data.p;
314:
315: test->omit_timer = NULL;
316: test->omitting = 0;
317: iperf_reset_stats(test);
318: if (test->verbose && !test->json_output && test->reporter_interval == 0)
319: iperf_printf(test, "%s", report_omit_done);
320:
321: /* Reset the timers. */
322: if (test->stats_timer != NULL)
323: tmr_reset(nowP, test->stats_timer);
324: if (test->reporter_timer != NULL)
325: tmr_reset(nowP, test->reporter_timer);
326: }
327:
328: static int
329: create_server_omit_timer(struct iperf_test * test)
330: {
331: struct iperf_time now;
332: TimerClientData cd;
333:
334: if (test->omit == 0) {
335: test->omit_timer = NULL;
336: test->omitting = 0;
337: } else {
338: if (iperf_time_now(&now) < 0) {
339: i_errno = IEINITTEST;
340: return -1;
341: }
342: test->omitting = 1;
343: cd.p = test;
344: test->omit_timer = tmr_create(&now, server_omit_timer_proc, cd, test->omit * SEC_TO_US, 0);
345: if (test->omit_timer == NULL) {
346: i_errno = IEINITTEST;
347: return -1;
348: }
349: }
350:
351: return 0;
352: }
353:
354: static void
355: cleanup_server(struct iperf_test *test)
356: {
357: struct iperf_stream *sp;
358:
359: /* Close open streams */
360: SLIST_FOREACH(sp, &test->streams, streams) {
361: FD_CLR(sp->socket, &test->read_set);
362: FD_CLR(sp->socket, &test->write_set);
363: close(sp->socket);
364: }
365:
366: /* Close open test sockets */
367: if (test->ctrl_sck) {
368: close(test->ctrl_sck);
369: }
370: if (test->listener) {
371: close(test->listener);
372: }
373:
374: /* Cancel any remaining timers. */
375: if (test->stats_timer != NULL) {
376: tmr_cancel(test->stats_timer);
377: test->stats_timer = NULL;
378: }
379: if (test->reporter_timer != NULL) {
380: tmr_cancel(test->reporter_timer);
381: test->reporter_timer = NULL;
382: }
383: if (test->omit_timer != NULL) {
384: tmr_cancel(test->omit_timer);
385: test->omit_timer = NULL;
386: }
387: if (test->congestion_used != NULL) {
388: free(test->congestion_used);
389: test->congestion_used = NULL;
390: }
391: if (test->timer != NULL) {
392: tmr_cancel(test->timer);
393: test->timer = NULL;
394: }
395: }
396:
397:
398: int
399: iperf_run_server(struct iperf_test *test)
400: {
401: int result, s;
402: int send_streams_accepted, rec_streams_accepted;
403: int streams_to_send = 0, streams_to_rec = 0;
404: #if defined(HAVE_TCP_CONGESTION)
405: int saved_errno;
406: #endif /* HAVE_TCP_CONGESTION */
407: fd_set read_set, write_set;
408: struct iperf_stream *sp;
409: struct iperf_time now;
410: struct timeval* timeout;
411: int flag;
412:
413: if (test->logfile)
414: if (iperf_open_logfile(test) < 0)
415: return -1;
416:
417: if (test->affinity != -1)
418: if (iperf_setaffinity(test, test->affinity) != 0)
419: return -2;
420:
421: if (test->json_output)
422: if (iperf_json_start(test) < 0)
423: return -2;
424:
425: if (test->json_output) {
426: cJSON_AddItemToObject(test->json_start, "version", cJSON_CreateString(version));
427: cJSON_AddItemToObject(test->json_start, "system_info", cJSON_CreateString(get_system_info()));
428: } else if (test->verbose) {
429: iperf_printf(test, "%s\n", version);
430: iperf_printf(test, "%s", "");
431: iperf_printf(test, "%s\n", get_system_info());
432: iflush(test);
433: }
434:
435: // Open socket and listen
436: if (iperf_server_listen(test) < 0) {
437: return -2;
438: }
439:
440: // Begin calculating CPU utilization
441: cpu_util(NULL);
442:
443: test->state = IPERF_START;
444: send_streams_accepted = 0;
445: rec_streams_accepted = 0;
446:
447: while (test->state != IPERF_DONE) {
448:
449: // Check if average transfer rate was exceeded (condition set in the callback routines)
450: if (test->bitrate_limit_exceeded) {
451: cleanup_server(test);
452: i_errno = IETOTALRATE;
453: return -1;
454: }
455:
456: memcpy(&read_set, &test->read_set, sizeof(fd_set));
457: memcpy(&write_set, &test->write_set, sizeof(fd_set));
458:
459: iperf_time_now(&now);
460: timeout = tmr_timeout(&now);
461: result = select(test->max_fd + 1, &read_set, &write_set, NULL, timeout);
462:
463: if (result < 0 && errno != EINTR) {
464: cleanup_server(test);
465: i_errno = IESELECT;
466: return -1;
467: }
468: if (result > 0) {
469: if (FD_ISSET(test->listener, &read_set)) {
470: if (test->state != CREATE_STREAMS) {
471: if (iperf_accept(test) < 0) {
472: cleanup_server(test);
473: return -1;
474: }
475: FD_CLR(test->listener, &read_set);
476:
477: // Set streams number
478: if (test->mode == BIDIRECTIONAL) {
479: streams_to_send = test->num_streams;
480: streams_to_rec = test->num_streams;
481: } else if (test->mode == RECEIVER) {
482: streams_to_rec = test->num_streams;
483: streams_to_send = 0;
484: } else {
485: streams_to_send = test->num_streams;
486: streams_to_rec = 0;
487: }
488: }
489: }
490: if (FD_ISSET(test->ctrl_sck, &read_set)) {
491: if (iperf_handle_message_server(test) < 0) {
492: cleanup_server(test);
493: return -1;
494: }
495: FD_CLR(test->ctrl_sck, &read_set);
496: }
497:
498: if (test->state == CREATE_STREAMS) {
499: if (FD_ISSET(test->prot_listener, &read_set)) {
500:
501: if ((s = test->protocol->accept(test)) < 0) {
502: cleanup_server(test);
503: return -1;
504: }
505:
506: #if defined(HAVE_TCP_CONGESTION)
507: if (test->protocol->id == Ptcp) {
508: if (test->congestion) {
509: if (setsockopt(s, IPPROTO_TCP, TCP_CONGESTION, test->congestion, strlen(test->congestion)) < 0) {
510: /*
511: * ENOENT means we tried to set the
512: * congestion algorithm but the algorithm
513: * specified doesn't exist. This can happen
514: * if the client and server have different
515: * congestion algorithms available. In this
516: * case, print a warning, but otherwise
517: * continue.
518: */
519: if (errno == ENOENT) {
520: warning("TCP congestion control algorithm not supported");
521: }
522: else {
523: saved_errno = errno;
524: close(s);
525: cleanup_server(test);
526: errno = saved_errno;
527: i_errno = IESETCONGESTION;
528: return -1;
529: }
530: }
531: }
532: {
533: socklen_t len = TCP_CA_NAME_MAX;
534: char ca[TCP_CA_NAME_MAX + 1];
535: if (getsockopt(s, IPPROTO_TCP, TCP_CONGESTION, ca, &len) < 0) {
536: saved_errno = errno;
537: close(s);
538: cleanup_server(test);
539: errno = saved_errno;
540: i_errno = IESETCONGESTION;
541: return -1;
542: }
543: test->congestion_used = strdup(ca);
544: if (test->debug) {
545: printf("Congestion algorithm is %s\n", test->congestion_used);
546: }
547: }
548: }
549: #endif /* HAVE_TCP_CONGESTION */
550:
551: if (!is_closed(s)) {
552:
553: if (rec_streams_accepted != streams_to_rec) {
554: flag = 0;
555: ++rec_streams_accepted;
556: } else if (send_streams_accepted != streams_to_send) {
557: flag = 1;
558: ++send_streams_accepted;
559: }
560:
561: if (flag != -1) {
562: sp = iperf_new_stream(test, s, flag);
563: if (!sp) {
564: cleanup_server(test);
565: return -1;
566: }
567:
568: if (sp->sender)
569: FD_SET(s, &test->write_set);
570: else
571: FD_SET(s, &test->read_set);
572:
573: if (s > test->max_fd) test->max_fd = s;
574:
575: /*
576: * If the protocol isn't UDP, or even if it is but
577: * we're the receiver, set nonblocking sockets.
578: * We need this to allow a server receiver to
579: * maintain interactivity with the control channel.
580: */
581: if (test->protocol->id != Pudp ||
582: !sp->sender) {
583: setnonblocking(s, 1);
584: }
585:
586: if (test->on_new_stream)
587: test->on_new_stream(sp);
588:
589: flag = -1;
590: }
591: }
592: FD_CLR(test->prot_listener, &read_set);
593: }
594:
595:
596: if (rec_streams_accepted == streams_to_rec && send_streams_accepted == streams_to_send) {
597: if (test->protocol->id != Ptcp) {
598: FD_CLR(test->prot_listener, &test->read_set);
599: close(test->prot_listener);
600: } else {
601: if (test->no_delay || test->settings->mss || test->settings->socket_bufsize) {
602: FD_CLR(test->listener, &test->read_set);
603: close(test->listener);
604: test->listener = 0;
605: if ((s = netannounce(test->settings->domain, Ptcp, test->bind_address, test->server_port)) < 0) {
606: cleanup_server(test);
607: i_errno = IELISTEN;
608: return -1;
609: }
610: test->listener = s;
611: FD_SET(test->listener, &test->read_set);
612: if (test->listener > test->max_fd) test->max_fd = test->listener;
613: }
614: }
615: test->prot_listener = -1;
616:
617: /* Ensure that total requested data rate is not above limit */
618: iperf_size_t total_requested_rate = test->num_streams * test->settings->rate * (test->mode == BIDIRECTIONAL? 2 : 1);
619: if (test->settings->bitrate_limit > 0 && total_requested_rate > test->settings->bitrate_limit) {
620: iperf_err(test, "Client total requested throughput rate of %" PRIu64 " bps exceeded %" PRIu64 " bps limit",
621: total_requested_rate, test->settings->bitrate_limit);
622: cleanup_server(test);
623: i_errno = IETOTALRATE;
624: return -1;
625: }
626:
627: if (iperf_set_send_state(test, TEST_START) != 0) {
628: cleanup_server(test);
629: return -1;
630: }
631: if (iperf_init_test(test) < 0) {
632: cleanup_server(test);
633: return -1;
634: }
635: if (create_server_timers(test) < 0) {
636: cleanup_server(test);
637: return -1;
638: }
639: if (create_server_omit_timer(test) < 0) {
640: cleanup_server(test);
641: return -1;
642: }
643: if (test->mode != RECEIVER)
644: if (iperf_create_send_timers(test) < 0) {
645: cleanup_server(test);
646: return -1;
647: }
648: if (iperf_set_send_state(test, TEST_RUNNING) != 0) {
649: cleanup_server(test);
650: return -1;
651: }
652: }
653: }
654:
655: if (test->state == TEST_RUNNING) {
656: if (test->mode == BIDIRECTIONAL) {
657: if (iperf_recv(test, &read_set) < 0) {
658: cleanup_server(test);
659: return -1;
660: }
661: if (iperf_send(test, &write_set) < 0) {
662: cleanup_server(test);
663: return -1;
664: }
665: } else if (test->mode == SENDER) {
666: // Reverse mode. Server sends.
667: if (iperf_send(test, &write_set) < 0) {
668: cleanup_server(test);
669: return -1;
670: }
671: } else {
672: // Regular mode. Server receives.
673: if (iperf_recv(test, &read_set) < 0) {
674: cleanup_server(test);
675: return -1;
676: }
677: }
678: }
679: }
680:
681: if (result == 0 ||
682: (timeout != NULL && timeout->tv_sec == 0 && timeout->tv_usec == 0)) {
683: /* Run the timers. */
684: iperf_time_now(&now);
685: tmr_run(&now);
686: }
687: }
688:
689: cleanup_server(test);
690:
691: if (test->json_output) {
692: if (iperf_json_finish(test) < 0)
693: return -1;
694: }
695:
696: iflush(test);
697:
698: if (test->server_affinity != -1)
699: if (iperf_clearaffinity(test) != 0)
700: return -1;
701:
702: return 0;
703: }
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