1 /* 2 * iperf, Copyright (c) 2014-2021 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 [email protected]. 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->bind_dev, 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 if (test->server_last_run_rc != 2) 91 test->server_test_number +=1; 92 if (test->debug || test->server_last_run_rc != 2) { 93 iperf_printf(test, "-----------------------------------------------------------\n"); 94 iperf_printf(test, "Server listening on %d (test #%d)\n", test->server_port, test->server_test_number); 95 iperf_printf(test, "-----------------------------------------------------------\n"); 96 if (test->forceflush) 97 iflush(test); 98 } 99 } 100 101 FD_ZERO(&test->read_set); 102 FD_ZERO(&test->write_set); 103 FD_SET(test->listener, &test->read_set); 104 if (test->listener > test->max_fd) test->max_fd = test->listener; 105 106 return 0; 107 } 108 109 int 110 iperf_accept(struct iperf_test *test) 111 { 112 int s; 113 signed char rbuf = ACCESS_DENIED; 114 socklen_t len; 115 struct sockaddr_storage addr; 116 117 len = sizeof(addr); 118 if ((s = accept(test->listener, (struct sockaddr *) &addr, &len)) < 0) { 119 i_errno = IEACCEPT; 120 return -1; 121 } 122 123 if (test->ctrl_sck == -1) { 124 /* Server free, accept new client */ 125 test->ctrl_sck = s; 126 // set TCP_NODELAY for lower latency on control messages 127 int flag = 1; 128 if (setsockopt(test->ctrl_sck, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int))) { 129 i_errno = IESETNODELAY; 130 return -1; 131 } 132 133 if (Nread(test->ctrl_sck, test->cookie, COOKIE_SIZE, Ptcp) < 0) { 134 i_errno = IERECVCOOKIE; 135 return -1; 136 } 137 FD_SET(test->ctrl_sck, &test->read_set); 138 if (test->ctrl_sck > test->max_fd) test->max_fd = test->ctrl_sck; 139 140 if (iperf_set_send_state(test, PARAM_EXCHANGE) != 0) 141 return -1; 142 if (iperf_exchange_parameters(test) < 0) 143 return -1; 144 if (test->server_affinity != -1) 145 if (iperf_setaffinity(test, test->server_affinity) != 0) 146 return -1; 147 if (test->on_connect) 148 test->on_connect(test); 149 } else { 150 /* 151 * Don't try to read from the socket. It could block an ongoing test. 152 * Just send ACCESS_DENIED. 153 */ 154 if (Nwrite(s, (char*) &rbuf, sizeof(rbuf), Ptcp) < 0) { 155 i_errno = IESENDMESSAGE; 156 return -1; 157 } 158 close(s); 159 } 160 161 return 0; 162 } 163 164 165 /**************************************************************************/ 166 int 167 iperf_handle_message_server(struct iperf_test *test) 168 { 169 int rval; 170 struct iperf_stream *sp; 171 172 // XXX: Need to rethink how this behaves to fit API 173 if ((rval = Nread(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp)) <= 0) { 174 if (rval == 0) { 175 iperf_err(test, "the client has unexpectedly closed the connection"); 176 i_errno = IECTRLCLOSE; 177 test->state = IPERF_DONE; 178 return 0; 179 } else { 180 i_errno = IERECVMESSAGE; 181 return -1; 182 } 183 } 184 185 switch(test->state) { 186 case TEST_START: 187 break; 188 case TEST_END: 189 test->done = 1; 190 cpu_util(test->cpu_util); 191 test->stats_callback(test); 192 SLIST_FOREACH(sp, &test->streams, streams) { 193 FD_CLR(sp->socket, &test->read_set); 194 FD_CLR(sp->socket, &test->write_set); 195 close(sp->socket); 196 } 197 test->reporter_callback(test); 198 if (iperf_set_send_state(test, EXCHANGE_RESULTS) != 0) 199 return -1; 200 if (iperf_exchange_results(test) < 0) 201 return -1; 202 if (iperf_set_send_state(test, DISPLAY_RESULTS) != 0) 203 return -1; 204 if (test->on_test_finish) 205 test->on_test_finish(test); 206 break; 207 case IPERF_DONE: 208 break; 209 case CLIENT_TERMINATE: 210 i_errno = IECLIENTTERM; 211 212 // Temporarily be in DISPLAY_RESULTS phase so we can get 213 // ending summary statistics. 214 signed char oldstate = test->state; 215 cpu_util(test->cpu_util); 216 test->state = DISPLAY_RESULTS; 217 test->reporter_callback(test); 218 test->state = oldstate; 219 220 // XXX: Remove this line below! 221 iperf_err(test, "the client has terminated"); 222 SLIST_FOREACH(sp, &test->streams, streams) { 223 FD_CLR(sp->socket, &test->read_set); 224 FD_CLR(sp->socket, &test->write_set); 225 close(sp->socket); 226 } 227 test->state = IPERF_DONE; 228 break; 229 default: 230 i_errno = IEMESSAGE; 231 return -1; 232 } 233 234 return 0; 235 } 236 237 static void 238 server_timer_proc(TimerClientData client_data, struct iperf_time *nowP) 239 { 240 struct iperf_test *test = client_data.p; 241 struct iperf_stream *sp; 242 243 test->timer = NULL; 244 if (test->done) 245 return; 246 test->done = 1; 247 /* Free streams */ 248 while (!SLIST_EMPTY(&test->streams)) { 249 sp = SLIST_FIRST(&test->streams); 250 SLIST_REMOVE_HEAD(&test->streams, streams); 251 close(sp->socket); 252 iperf_free_stream(sp); 253 } 254 close(test->ctrl_sck); 255 } 256 257 static void 258 server_stats_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->stats_callback) 265 test->stats_callback(test); 266 } 267 268 static void 269 server_reporter_timer_proc(TimerClientData client_data, struct iperf_time *nowP) 270 { 271 struct iperf_test *test = client_data.p; 272 273 if (test->done) 274 return; 275 if (test->reporter_callback) 276 test->reporter_callback(test); 277 } 278 279 static int 280 create_server_timers(struct iperf_test * test) 281 { 282 struct iperf_time now; 283 TimerClientData cd; 284 int max_rtt = 4; /* seconds */ 285 int state_transitions = 10; /* number of state transitions in iperf3 */ 286 int grace_period = max_rtt * state_transitions; 287 288 if (iperf_time_now(&now) < 0) { 289 i_errno = IEINITTEST; 290 return -1; 291 } 292 cd.p = test; 293 test->timer = test->stats_timer = test->reporter_timer = NULL; 294 if (test->duration != 0 ) { 295 test->done = 0; 296 test->timer = tmr_create(&now, server_timer_proc, cd, (test->duration + test->omit + grace_period) * SEC_TO_US, 0); 297 if (test->timer == NULL) { 298 i_errno = IEINITTEST; 299 return -1; 300 } 301 } 302 303 test->stats_timer = test->reporter_timer = NULL; 304 if (test->stats_interval != 0) { 305 test->stats_timer = tmr_create(&now, server_stats_timer_proc, cd, test->stats_interval * SEC_TO_US, 1); 306 if (test->stats_timer == NULL) { 307 i_errno = IEINITTEST; 308 return -1; 309 } 310 } 311 if (test->reporter_interval != 0) { 312 test->reporter_timer = tmr_create(&now, server_reporter_timer_proc, cd, test->reporter_interval * SEC_TO_US, 1); 313 if (test->reporter_timer == NULL) { 314 i_errno = IEINITTEST; 315 return -1; 316 } 317 } 318 return 0; 319 } 320 321 static void 322 server_omit_timer_proc(TimerClientData client_data, struct iperf_time *nowP) 323 { 324 struct iperf_test *test = client_data.p; 325 326 test->omit_timer = NULL; 327 test->omitting = 0; 328 iperf_reset_stats(test); 329 if (test->verbose && !test->json_output && test->reporter_interval == 0) 330 iperf_printf(test, "%s", report_omit_done); 331 332 /* Reset the timers. */ 333 if (test->stats_timer != NULL) 334 tmr_reset(nowP, test->stats_timer); 335 if (test->reporter_timer != NULL) 336 tmr_reset(nowP, test->reporter_timer); 337 } 338 339 static int 340 create_server_omit_timer(struct iperf_test * test) 341 { 342 struct iperf_time now; 343 TimerClientData cd; 344 345 if (test->omit == 0) { 346 test->omit_timer = NULL; 347 test->omitting = 0; 348 } else { 349 if (iperf_time_now(&now) < 0) { 350 i_errno = IEINITTEST; 351 return -1; 352 } 353 test->omitting = 1; 354 cd.p = test; 355 test->omit_timer = tmr_create(&now, server_omit_timer_proc, cd, test->omit * SEC_TO_US, 0); 356 if (test->omit_timer == NULL) { 357 i_errno = IEINITTEST; 358 return -1; 359 } 360 } 361 362 return 0; 363 } 364 365 static void 366 cleanup_server(struct iperf_test *test) 367 { 368 struct iperf_stream *sp; 369 370 /* Close open streams */ 371 SLIST_FOREACH(sp, &test->streams, streams) { 372 FD_CLR(sp->socket, &test->read_set); 373 FD_CLR(sp->socket, &test->write_set); 374 close(sp->socket); 375 } 376 377 /* Close open test sockets */ 378 if (test->ctrl_sck) { 379 close(test->ctrl_sck); 380 } 381 if (test->listener) { 382 close(test->listener); 383 } 384 if (test->prot_listener > -1) { // May remain open if create socket failed 385 close(test->prot_listener); 386 } 387 388 /* Cancel any remaining timers. */ 389 if (test->stats_timer != NULL) { 390 tmr_cancel(test->stats_timer); 391 test->stats_timer = NULL; 392 } 393 if (test->reporter_timer != NULL) { 394 tmr_cancel(test->reporter_timer); 395 test->reporter_timer = NULL; 396 } 397 if (test->omit_timer != NULL) { 398 tmr_cancel(test->omit_timer); 399 test->omit_timer = NULL; 400 } 401 if (test->congestion_used != NULL) { 402 free(test->congestion_used); 403 test->congestion_used = NULL; 404 } 405 if (test->timer != NULL) { 406 tmr_cancel(test->timer); 407 test->timer = NULL; 408 } 409 } 410 411 412 int 413 iperf_run_server(struct iperf_test *test) 414 { 415 int result, s; 416 int send_streams_accepted, rec_streams_accepted; 417 int streams_to_send = 0, streams_to_rec = 0; 418 #if defined(HAVE_TCP_CONGESTION) 419 int saved_errno; 420 #endif /* HAVE_TCP_CONGESTION */ 421 fd_set read_set, write_set; 422 struct iperf_stream *sp; 423 struct iperf_time now; 424 struct iperf_time last_receive_time; 425 struct iperf_time diff_time; 426 struct timeval* timeout; 427 struct timeval default_timeout; 428 int flag; 429 int64_t t_usecs; 430 431 if (test->logfile) 432 if (iperf_open_logfile(test) < 0) 433 return -1; 434 435 if (test->affinity != -1) 436 if (iperf_setaffinity(test, test->affinity) != 0) 437 return -2; 438 439 if (test->json_output) 440 if (iperf_json_start(test) < 0) 441 return -2; 442 443 if (test->json_output) { 444 cJSON_AddItemToObject(test->json_start, "version", cJSON_CreateString(version)); 445 cJSON_AddItemToObject(test->json_start, "system_info", cJSON_CreateString(get_system_info())); 446 } else if (test->verbose) { 447 iperf_printf(test, "%s\n", version); 448 iperf_printf(test, "%s", ""); 449 iperf_printf(test, "%s\n", get_system_info()); 450 iflush(test); 451 } 452 453 // Open socket and listen 454 if (iperf_server_listen(test) < 0) { 455 return -2; 456 } 457 458 iperf_time_now(&last_receive_time); // Initialize last time something was received 459 460 test->state = IPERF_START; 461 send_streams_accepted = 0; 462 rec_streams_accepted = 0; 463 464 while (test->state != IPERF_DONE) { 465 466 // Check if average transfer rate was exceeded (condition set in the callback routines) 467 if (test->bitrate_limit_exceeded) { 468 cleanup_server(test); 469 i_errno = IETOTALRATE; 470 return -1; 471 } 472 473 memcpy(&read_set, &test->read_set, sizeof(fd_set)); 474 memcpy(&write_set, &test->write_set, sizeof(fd_set)); 475 476 iperf_time_now(&now); 477 timeout = tmr_timeout(&now); 478 479 // Ensure select() will timeout to allow handling error cases that require server restart 480 if (timeout == NULL) { 481 default_timeout.tv_sec = 0; 482 if (test->state == IPERF_START) { 483 if (test-> settings->idle_timeout > 0) 484 default_timeout.tv_sec = test-> settings->idle_timeout; 485 } else { 486 default_timeout.tv_sec = NO_MSG_RCVD_TIMEOUT; 487 } 488 if (default_timeout.tv_sec > 0) { 489 default_timeout.tv_usec = 0; 490 timeout = &default_timeout; 491 } 492 } 493 494 result = select(test->max_fd + 1, &read_set, &write_set, NULL, timeout); 495 if (result < 0 && errno != EINTR) { 496 cleanup_server(test); 497 i_errno = IESELECT; 498 return -1; 499 } else if (result == 0) { 500 // If nothing was received during the last ... time 501 // then probably something got stack either at the client, server or network, 502 // and Test should forced to end. 503 iperf_time_now(&now); 504 t_usecs = 0; 505 if (iperf_time_diff(&now, &last_receive_time, &diff_time) == 0) { 506 t_usecs = iperf_time_in_usecs(&diff_time); 507 if (test->state == IPERF_START) { 508 if (test->settings->idle_timeout > 0 && t_usecs >= test->settings->idle_timeout * SEC_TO_US) { 509 test->server_forced_idle_restarts_count += 1; 510 if (test->debug) 511 printf("Server restart (#%d) in idle state as no connection request was received for %d sec\n", 512 test->server_forced_idle_restarts_count, test-> settings->idle_timeout); 513 cleanup_server(test); 514 return 2; 515 } 516 } 517 else if (t_usecs > NO_MSG_RCVD_TIMEOUT * SEC_TO_US) { 518 test->server_forced_no_msg_restarts_count += 1; 519 i_errno = IENOMSG; 520 iperf_err(test, "Server restart (#%d) in active test as no message was received for %d sec", 521 test->server_forced_no_msg_restarts_count, NO_MSG_RCVD_TIMEOUT); 522 cleanup_server(test); 523 return -1; 524 } 525 526 } 527 } 528 529 if (result > 0) { 530 iperf_time_now(&last_receive_time); 531 if (FD_ISSET(test->listener, &read_set)) { 532 if (test->state != CREATE_STREAMS) { 533 if (iperf_accept(test) < 0) { 534 cleanup_server(test); 535 return -1; 536 } 537 FD_CLR(test->listener, &read_set); 538 539 // Set streams number 540 if (test->mode == BIDIRECTIONAL) { 541 streams_to_send = test->num_streams; 542 streams_to_rec = test->num_streams; 543 } else if (test->mode == RECEIVER) { 544 streams_to_rec = test->num_streams; 545 streams_to_send = 0; 546 } else { 547 streams_to_send = test->num_streams; 548 streams_to_rec = 0; 549 } 550 } 551 } 552 if (FD_ISSET(test->ctrl_sck, &read_set)) { 553 if (iperf_handle_message_server(test) < 0) { 554 cleanup_server(test); 555 return -1; 556 } 557 FD_CLR(test->ctrl_sck, &read_set); 558 } 559 560 if (test->state == CREATE_STREAMS) { 561 if (FD_ISSET(test->prot_listener, &read_set)) { 562 563 if ((s = test->protocol->accept(test)) < 0) { 564 cleanup_server(test); 565 return -1; 566 } 567 568 #if defined(HAVE_TCP_CONGESTION) 569 if (test->protocol->id == Ptcp) { 570 if (test->congestion) { 571 if (setsockopt(s, IPPROTO_TCP, TCP_CONGESTION, test->congestion, strlen(test->congestion)) < 0) { 572 /* 573 * ENOENT means we tried to set the 574 * congestion algorithm but the algorithm 575 * specified doesn't exist. This can happen 576 * if the client and server have different 577 * congestion algorithms available. In this 578 * case, print a warning, but otherwise 579 * continue. 580 */ 581 if (errno == ENOENT) { 582 warning("TCP congestion control algorithm not supported"); 583 } 584 else { 585 saved_errno = errno; 586 close(s); 587 cleanup_server(test); 588 errno = saved_errno; 589 i_errno = IESETCONGESTION; 590 return -1; 591 } 592 } 593 } 594 { 595 socklen_t len = TCP_CA_NAME_MAX; 596 char ca[TCP_CA_NAME_MAX + 1]; 597 if (getsockopt(s, IPPROTO_TCP, TCP_CONGESTION, ca, &len) < 0) { 598 saved_errno = errno; 599 close(s); 600 cleanup_server(test); 601 errno = saved_errno; 602 i_errno = IESETCONGESTION; 603 return -1; 604 } 605 /* 606 * If not the first connection, discard prior 607 * congestion algorithm name so we don't leak 608 * duplicated strings. We probably don't need 609 * the old string anyway. 610 */ 611 if (test->congestion_used != NULL) { 612 free(test->congestion_used); 613 } 614 test->congestion_used = strdup(ca); 615 if (test->debug) { 616 printf("Congestion algorithm is %s\n", test->congestion_used); 617 } 618 } 619 } 620 #endif /* HAVE_TCP_CONGESTION */ 621 622 if (!is_closed(s)) { 623 624 if (rec_streams_accepted != streams_to_rec) { 625 flag = 0; 626 ++rec_streams_accepted; 627 } else if (send_streams_accepted != streams_to_send) { 628 flag = 1; 629 ++send_streams_accepted; 630 } 631 632 if (flag != -1) { 633 sp = iperf_new_stream(test, s, flag); 634 if (!sp) { 635 cleanup_server(test); 636 return -1; 637 } 638 639 if (sp->sender) 640 FD_SET(s, &test->write_set); 641 else 642 FD_SET(s, &test->read_set); 643 644 if (s > test->max_fd) test->max_fd = s; 645 646 /* 647 * If the protocol isn't UDP, or even if it is but 648 * we're the receiver, set nonblocking sockets. 649 * We need this to allow a server receiver to 650 * maintain interactivity with the control channel. 651 */ 652 if (test->protocol->id != Pudp || 653 !sp->sender) { 654 setnonblocking(s, 1); 655 } 656 657 if (test->on_new_stream) 658 test->on_new_stream(sp); 659 660 flag = -1; 661 } 662 } 663 FD_CLR(test->prot_listener, &read_set); 664 } 665 666 667 if (rec_streams_accepted == streams_to_rec && send_streams_accepted == streams_to_send) { 668 if (test->protocol->id != Ptcp) { 669 FD_CLR(test->prot_listener, &test->read_set); 670 close(test->prot_listener); 671 } else { 672 if (test->no_delay || test->settings->mss || test->settings->socket_bufsize) { 673 FD_CLR(test->listener, &test->read_set); 674 close(test->listener); 675 test->listener = 0; 676 if ((s = netannounce(test->settings->domain, Ptcp, test->bind_address, test->bind_dev, test->server_port)) < 0) { 677 cleanup_server(test); 678 i_errno = IELISTEN; 679 return -1; 680 } 681 test->listener = s; 682 FD_SET(test->listener, &test->read_set); 683 if (test->listener > test->max_fd) test->max_fd = test->listener; 684 } 685 } 686 test->prot_listener = -1; 687 688 /* Ensure that total requested data rate is not above limit */ 689 iperf_size_t total_requested_rate = test->num_streams * test->settings->rate * (test->mode == BIDIRECTIONAL? 2 : 1); 690 if (test->settings->bitrate_limit > 0 && total_requested_rate > test->settings->bitrate_limit) { 691 iperf_err(test, "Client total requested throughput rate of %" PRIu64 " bps exceeded %" PRIu64 " bps limit", 692 total_requested_rate, test->settings->bitrate_limit); 693 cleanup_server(test); 694 i_errno = IETOTALRATE; 695 return -1; 696 } 697 698 // Begin calculating CPU utilization 699 cpu_util(NULL); 700 701 if (iperf_set_send_state(test, TEST_START) != 0) { 702 cleanup_server(test); 703 return -1; 704 } 705 if (iperf_init_test(test) < 0) { 706 cleanup_server(test); 707 return -1; 708 } 709 if (create_server_timers(test) < 0) { 710 cleanup_server(test); 711 return -1; 712 } 713 if (create_server_omit_timer(test) < 0) { 714 cleanup_server(test); 715 return -1; 716 } 717 if (test->mode != RECEIVER) 718 if (iperf_create_send_timers(test) < 0) { 719 cleanup_server(test); 720 return -1; 721 } 722 if (iperf_set_send_state(test, TEST_RUNNING) != 0) { 723 cleanup_server(test); 724 return -1; 725 } 726 } 727 } 728 729 if (test->state == TEST_RUNNING) { 730 if (test->mode == BIDIRECTIONAL) { 731 if (iperf_recv(test, &read_set) < 0) { 732 cleanup_server(test); 733 return -1; 734 } 735 if (iperf_send(test, &write_set) < 0) { 736 cleanup_server(test); 737 return -1; 738 } 739 } else if (test->mode == SENDER) { 740 // Reverse mode. Server sends. 741 if (iperf_send(test, &write_set) < 0) { 742 cleanup_server(test); 743 return -1; 744 } 745 } else { 746 // Regular mode. Server receives. 747 if (iperf_recv(test, &read_set) < 0) { 748 cleanup_server(test); 749 return -1; 750 } 751 } 752 } 753 } 754 755 if (result == 0 || 756 (timeout != NULL && timeout->tv_sec == 0 && timeout->tv_usec == 0)) { 757 /* Run the timers. */ 758 iperf_time_now(&now); 759 tmr_run(&now); 760 } 761 } 762 763 cleanup_server(test); 764 765 if (test->json_output) { 766 if (iperf_json_finish(test) < 0) 767 return -1; 768 } 769 770 iflush(test); 771 772 if (test->server_affinity != -1) 773 if (iperf_clearaffinity(test) != 0) 774 return -1; 775 776 return 0; 777 } 778