/*
* iperf, Copyright (c) 2014-2022 The Regents of the University of
* California, through Lawrence Berkeley National Laboratory (subject
* to receipt of any required approvals from the U.S. Dept. of
* Energy). All rights reserved.
*
* If you have questions about your rights to use or distribute this
* software, please contact Berkeley Lab's Technology Transfer
* Department at TTD@lbl.gov.
*
* NOTICE. This software is owned by the U.S. Department of Energy.
* As such, the U.S. Government has been granted for itself and others
* acting on its behalf a paid-up, nonexclusive, irrevocable,
* worldwide license in the Software to reproduce, prepare derivative
* works, and perform publicly and display publicly. Beginning five
* (5) years after the date permission to assert copyright is obtained
* from the U.S. Department of Energy, and subject to any subsequent
* five (5) year renewals, the U.S. Government is granted for itself
* and others acting on its behalf a paid-up, nonexclusive,
* irrevocable, worldwide license in the Software to reproduce,
* prepare derivative works, distribute copies to the public, perform
* publicly and display publicly, and to permit others to do so.
*
* This code is distributed under a BSD style license, see the LICENSE
* file for complete information.
*/
/* iperf_server_api.c: Functions to be used by an iperf server
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <sys/time.h>
#include <sys/resource.h>
#include <sched.h>
#include <setjmp.h>
#include "iperf.h"
#include "iperf_api.h"
#include "iperf_udp.h"
#include "iperf_tcp.h"
#include "iperf_util.h"
#include "timer.h"
#include "iperf_time.h"
#include "net.h"
#include "units.h"
#include "iperf_util.h"
#include "iperf_locale.h"
#if defined(HAVE_TCP_CONGESTION)
#if !defined(TCP_CA_NAME_MAX)
#define TCP_CA_NAME_MAX 16
#endif /* TCP_CA_NAME_MAX */
#endif /* HAVE_TCP_CONGESTION */
int
iperf_server_listen(struct iperf_test *test)
{
retry:
if((test->listener = netannounce(test->settings->domain, Ptcp, test->bind_address, test->bind_dev, test->server_port)) < 0) {
if (errno == EAFNOSUPPORT && (test->settings->domain == AF_INET6 || test->settings->domain == AF_UNSPEC)) {
/* If we get "Address family not supported by protocol", that
** probably means we were compiled with IPv6 but the running
** kernel does not actually do IPv6. This is not too unusual,
** v6 support is and perhaps always will be spotty.
*/
warning("this system does not seem to support IPv6 - trying IPv4");
test->settings->domain = AF_INET;
goto retry;
} else {
i_errno = IELISTEN;
return -1;
}
}
if (!test->json_output) {
if (test->server_last_run_rc != 2)
test->server_test_number +=1;
if (test->debug || test->server_last_run_rc != 2) {
iperf_printf(test, "-----------------------------------------------------------\n");
iperf_printf(test, "Server listening on %d (test #%d)\n", test->server_port, test->server_test_number);
iperf_printf(test, "-----------------------------------------------------------\n");
if (test->forceflush)
iflush(test);
}
}
FD_ZERO(&test->read_set);
FD_ZERO(&test->write_set);
FD_SET(test->listener, &test->read_set);
if (test->listener > test->max_fd) test->max_fd = test->listener;
return 0;
}
int
iperf_accept(struct iperf_test *test)
{
int s;
signed char rbuf = ACCESS_DENIED;
socklen_t len;
struct sockaddr_storage addr;
len = sizeof(addr);
if ((s = accept(test->listener, (struct sockaddr *) &addr, &len)) < 0) {
i_errno = IEACCEPT;
return -1;
}
if (test->ctrl_sck == -1) {
/* Server free, accept new client */
test->ctrl_sck = s;
// set TCP_NODELAY for lower latency on control messages
int flag = 1;
if (setsockopt(test->ctrl_sck, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int))) {
i_errno = IESETNODELAY;
return -1;
}
#if defined(HAVE_TCP_USER_TIMEOUT)
int opt;
if ((opt = test->settings->snd_timeout)) {
if (setsockopt(s, IPPROTO_TCP, TCP_USER_TIMEOUT, &opt, sizeof(opt)) < 0) {
i_errno = IESETUSERTIMEOUT;
return -1;
}
}
#endif /* HAVE_TCP_USER_TIMEOUT */
if (Nread(test->ctrl_sck, test->cookie, COOKIE_SIZE, Ptcp) != COOKIE_SIZE) {
/*
* Note this error covers both the case of a system error
* or the inability to read the correct amount of data
* (i.e. timed out).
*/
i_errno = IERECVCOOKIE;
return -1;
}
FD_SET(test->ctrl_sck, &test->read_set);
if (test->ctrl_sck > test->max_fd) test->max_fd = test->ctrl_sck;
if (iperf_set_send_state(test, PARAM_EXCHANGE) != 0)
return -1;
if (iperf_exchange_parameters(test) < 0)
return -1;
if (test->server_affinity != -1)
if (iperf_setaffinity(test, test->server_affinity) != 0)
return -1;
if (test->on_connect)
test->on_connect(test);
} else {
/*
* Don't try to read from the socket. It could block an ongoing test.
* Just send ACCESS_DENIED.
* Also, if sending failed, don't return an error, as the request is not related
* to the ongoing test, and returning an error will terminate the test.
*/
if (Nwrite(s, (char*) &rbuf, sizeof(rbuf), Ptcp) < 0) {
if (test->debug)
printf("failed to send ACCESS_DENIED to an unsolicited connection request during active test\n");
} else {
if (test->debug)
printf("successfully sent ACCESS_DENIED to an unsolicited connection request during active test\n");
}
close(s);
}
return 0;
}
/**************************************************************************/
int
iperf_handle_message_server(struct iperf_test *test)
{
int rval;
struct iperf_stream *sp;
// XXX: Need to rethink how this behaves to fit API
if ((rval = Nread(test->ctrl_sck, (char*) &test->state, sizeof(signed char), Ptcp)) <= 0) {
if (rval == 0) {
iperf_err(test, "the client has unexpectedly closed the connection");
i_errno = IECTRLCLOSE;
test->state = IPERF_DONE;
return 0;
} else {
i_errno = IERECVMESSAGE;
return -1;
}
}
switch(test->state) {
case TEST_START:
break;
case TEST_END:
test->done = 1;
cpu_util(test->cpu_util);
test->stats_callback(test);
SLIST_FOREACH(sp, &test->streams, streams) {
FD_CLR(sp->socket, &test->read_set);
FD_CLR(sp->socket, &test->write_set);
close(sp->socket);
}
test->reporter_callback(test);
if (iperf_set_send_state(test, EXCHANGE_RESULTS) != 0)
return -1;
if (iperf_exchange_results(test) < 0)
return -1;
if (iperf_set_send_state(test, DISPLAY_RESULTS) != 0)
return -1;
if (test->on_test_finish)
test->on_test_finish(test);
break;
case IPERF_DONE:
break;
case CLIENT_TERMINATE:
i_errno = IECLIENTTERM;
// Temporarily be in DISPLAY_RESULTS phase so we can get
// ending summary statistics.
signed char oldstate = test->state;
cpu_util(test->cpu_util);
test->state = DISPLAY_RESULTS;
test->reporter_callback(test);
test->state = oldstate;
// XXX: Remove this line below!
iperf_err(test, "the client has terminated");
SLIST_FOREACH(sp, &test->streams, streams) {
FD_CLR(sp->socket, &test->read_set);
FD_CLR(sp->socket, &test->write_set);
close(sp->socket);
}
test->state = IPERF_DONE;
break;
default:
i_errno = IEMESSAGE;
return -1;
}
return 0;
}
static void
server_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
{
struct iperf_test *test = client_data.p;
struct iperf_stream *sp;
test->timer = NULL;
if (test->done)
return;
test->done = 1;
/* Free streams */
while (!SLIST_EMPTY(&test->streams)) {
sp = SLIST_FIRST(&test->streams);
SLIST_REMOVE_HEAD(&test->streams, streams);
close(sp->socket);
iperf_free_stream(sp);
}
close(test->ctrl_sck);
test->ctrl_sck = -1;
}
static void
server_stats_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
{
struct iperf_test *test = client_data.p;
if (test->done)
return;
if (test->stats_callback)
test->stats_callback(test);
}
static void
server_reporter_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
{
struct iperf_test *test = client_data.p;
if (test->done)
return;
if (test->reporter_callback)
test->reporter_callback(test);
}
static int
create_server_timers(struct iperf_test * test)
{
struct iperf_time now;
TimerClientData cd;
int max_rtt = 4; /* seconds */
int state_transitions = 10; /* number of state transitions in iperf3 */
int grace_period = max_rtt * state_transitions;
if (iperf_time_now(&now) < 0) {
i_errno = IEINITTEST;
return -1;
}
cd.p = test;
test->timer = test->stats_timer = test->reporter_timer = NULL;
if (test->duration != 0 ) {
test->done = 0;
test->timer = tmr_create(&now, server_timer_proc, cd, (test->duration + test->omit + grace_period) * SEC_TO_US, 0);
if (test->timer == NULL) {
i_errno = IEINITTEST;
return -1;
}
}
test->stats_timer = test->reporter_timer = NULL;
if (test->stats_interval != 0) {
test->stats_timer = tmr_create(&now, server_stats_timer_proc, cd, test->stats_interval * SEC_TO_US, 1);
if (test->stats_timer == NULL) {
i_errno = IEINITTEST;
return -1;
}
}
if (test->reporter_interval != 0) {
test->reporter_timer = tmr_create(&now, server_reporter_timer_proc, cd, test->reporter_interval * SEC_TO_US, 1);
if (test->reporter_timer == NULL) {
i_errno = IEINITTEST;
return -1;
}
}
return 0;
}
static void
server_omit_timer_proc(TimerClientData client_data, struct iperf_time *nowP)
{
struct iperf_test *test = client_data.p;
test->omit_timer = NULL;
test->omitting = 0;
iperf_reset_stats(test);
if (test->verbose && !test->json_output && test->reporter_interval == 0)
iperf_printf(test, "%s", report_omit_done);
/* Reset the timers. */
if (test->stats_timer != NULL)
tmr_reset(nowP, test->stats_timer);
if (test->reporter_timer != NULL)
tmr_reset(nowP, test->reporter_timer);
}
static int
create_server_omit_timer(struct iperf_test * test)
{
struct iperf_time now;
TimerClientData cd;
if (test->omit == 0) {
test->omit_timer = NULL;
test->omitting = 0;
} else {
if (iperf_time_now(&now) < 0) {
i_errno = IEINITTEST;
return -1;
}
test->omitting = 1;
cd.p = test;
test->omit_timer = tmr_create(&now, server_omit_timer_proc, cd, test->omit * SEC_TO_US, 0);
if (test->omit_timer == NULL) {
i_errno = IEINITTEST;
return -1;
}
}
return 0;
}
static void
cleanup_server(struct iperf_test *test)
{
struct iperf_stream *sp;
/* Close open streams */
SLIST_FOREACH(sp, &test->streams, streams) {
if (sp->socket > -1) {
FD_CLR(sp->socket, &test->read_set);
FD_CLR(sp->socket, &test->write_set);
close(sp->socket);
sp->socket = -1;
}
}
/* Close open test sockets */
if (test->ctrl_sck > -1) {
close(test->ctrl_sck);
test->ctrl_sck = -1;
}
if (test->listener > -1) {
close(test->listener);
test->listener = -1;
}
if (test->prot_listener > -1) { // May remain open if create socket failed
close(test->prot_listener);
test->prot_listener = -1;
}
/* Cancel any remaining timers. */
if (test->stats_timer != NULL) {
tmr_cancel(test->stats_timer);
test->stats_timer = NULL;
}
if (test->reporter_timer != NULL) {
tmr_cancel(test->reporter_timer);
test->reporter_timer = NULL;
}
if (test->omit_timer != NULL) {
tmr_cancel(test->omit_timer);
test->omit_timer = NULL;
}
if (test->congestion_used != NULL) {
free(test->congestion_used);
test->congestion_used = NULL;
}
if (test->timer != NULL) {
tmr_cancel(test->timer);
test->timer = NULL;
}
}
int
iperf_run_server(struct iperf_test *test)
{
int result, s;
int send_streams_accepted, rec_streams_accepted;
int streams_to_send = 0, streams_to_rec = 0;
#if defined(HAVE_TCP_CONGESTION)
int saved_errno;
#endif /* HAVE_TCP_CONGESTION */
fd_set read_set, write_set;
struct iperf_stream *sp;
struct iperf_time now;
struct iperf_time last_receive_time;
struct iperf_time diff_time;
struct timeval* timeout;
struct timeval used_timeout;
int flag;
int64_t t_usecs;
int64_t timeout_us;
int64_t rcv_timeout_us;
if (test->logfile)
if (iperf_open_logfile(test) < 0)
return -2;
if (test->affinity != -1)
if (iperf_setaffinity(test, test->affinity) != 0) {
cleanup_server(test);
return -2;
}
if (test->json_output)
if (iperf_json_start(test) < 0) {
cleanup_server(test);
return -2;
}
if (test->json_output) {
cJSON_AddItemToObject(test->json_start, "version", cJSON_CreateString(version));
cJSON_AddItemToObject(test->json_start, "system_info", cJSON_CreateString(get_system_info()));
} else if (test->verbose) {
iperf_printf(test, "%s\n", version);
iperf_printf(test, "%s", "");
iperf_printf(test, "%s\n", get_system_info());
iflush(test);
}
// Open socket and listen
if (iperf_server_listen(test) < 0) {
cleanup_server(test);
return -2;
}
iperf_time_now(&last_receive_time); // Initialize last time something was received
test->state = IPERF_START;
send_streams_accepted = 0;
rec_streams_accepted = 0;
rcv_timeout_us = (test->settings->rcv_timeout.secs * SEC_TO_US) + test->settings->rcv_timeout.usecs;
while (test->state != IPERF_DONE) {
// Check if average transfer rate was exceeded (condition set in the callback routines)
if (test->bitrate_limit_exceeded) {
cleanup_server(test);
i_errno = IETOTALRATE;
return -1;
}
memcpy(&read_set, &test->read_set, sizeof(fd_set));
memcpy(&write_set, &test->write_set, sizeof(fd_set));
iperf_time_now(&now);
timeout = tmr_timeout(&now);
// Ensure select() will timeout to allow handling error cases that require server restart
if (test->state == IPERF_START) { // In idle mode server may need to restart
if (timeout == NULL && test->settings->idle_timeout > 0) {
used_timeout.tv_sec = test->settings->idle_timeout;
used_timeout.tv_usec = 0;
timeout = &used_timeout;
}
} else if (test->mode != SENDER) { // In non-reverse active mode server ensures data is received
timeout_us = -1;
if (timeout != NULL) {
used_timeout.tv_sec = timeout->tv_sec;
used_timeout.tv_usec = timeout->tv_usec;
timeout_us = (timeout->tv_sec * SEC_TO_US) + timeout->tv_usec;
}
if (timeout_us < 0 || timeout_us > rcv_timeout_us) {
used_timeout.tv_sec = test->settings->rcv_timeout.secs;
used_timeout.tv_usec = test->settings->rcv_timeout.usecs;
}
timeout = &used_timeout;
}
result = select(test->max_fd + 1, &read_set, &write_set, NULL, timeout);
if (result < 0 && errno != EINTR) {
cleanup_server(test);
i_errno = IESELECT;
return -1;
} else if (result == 0) {
// If nothing was received during the specified time (per state)
// then probably something got stack either at the client, server or network,
// and Test should be forced to end.
iperf_time_now(&now);
t_usecs = 0;
if (iperf_time_diff(&now, &last_receive_time, &diff_time) == 0) {
t_usecs = iperf_time_in_usecs(&diff_time);
if (test->state == IPERF_START) {
if (test->settings->idle_timeout > 0 && t_usecs >= test->settings->idle_timeout * SEC_TO_US) {
test->server_forced_idle_restarts_count += 1;
if (test->debug)
printf("Server restart (#%d) in idle state as no connection request was received for %d sec\n",
test->server_forced_idle_restarts_count, test->settings->idle_timeout);
cleanup_server(test);
if ( iperf_get_test_one_off(test) ) {
if (test->debug)
printf("No connection request was received for %d sec in one-off mode; exiting.\n",
test->settings->idle_timeout);
exit(0);
}
return 2;
}
}
else if (test->mode != SENDER && t_usecs > rcv_timeout_us) {
test->server_forced_no_msg_restarts_count += 1;
i_errno = IENOMSG;
if (iperf_get_verbose(test))
iperf_err(test, "Server restart (#%d) during active test due to idle timeout for receiving data",
test->server_forced_no_msg_restarts_count);
cleanup_server(test);
return -1;
}
}
}
if (result > 0) {
iperf_time_now(&last_receive_time);
if (FD_ISSET(test->listener, &read_set)) {
if (test->state != CREATE_STREAMS) {
if (iperf_accept(test) < 0) {
cleanup_server(test);
return -1;
}
FD_CLR(test->listener, &read_set);
// Set streams number
if (test->mode == BIDIRECTIONAL) {
streams_to_send = test->num_streams;
streams_to_rec = test->num_streams;
} else if (test->mode == RECEIVER) {
streams_to_rec = test->num_streams;
streams_to_send = 0;
} else {
streams_to_send = test->num_streams;
streams_to_rec = 0;
}
}
}
if (FD_ISSET(test->ctrl_sck, &read_set)) {
if (iperf_handle_message_server(test) < 0) {
cleanup_server(test);
return -1;
}
FD_CLR(test->ctrl_sck, &read_set);
}
if (test->state == CREATE_STREAMS) {
if (FD_ISSET(test->prot_listener, &read_set)) {
if ((s = test->protocol->accept(test)) < 0) {
cleanup_server(test);
return -1;
}
/* apply other common socket options */
if (iperf_common_sockopts(test, s) < 0)
{
cleanup_server(test);
return -1;
}
if (!is_closed(s)) {
#if defined(HAVE_TCP_USER_TIMEOUT)
if (test->protocol->id == Ptcp) {
int opt;
if ((opt = test->settings->snd_timeout)) {
if (setsockopt(s, IPPROTO_TCP, TCP_USER_TIMEOUT, &opt, sizeof(opt)) < 0) {
saved_errno = errno;
close(s);
cleanup_server(test);
errno = saved_errno;
i_errno = IESETUSERTIMEOUT;
return -1;
}
}
}
#endif /* HAVE_TCP_USER_TIMEOUT */
#if defined(HAVE_TCP_CONGESTION)
if (test->protocol->id == Ptcp) {
if (test->congestion) {
if (setsockopt(s, IPPROTO_TCP, TCP_CONGESTION, test->congestion, strlen(test->congestion)) < 0) {
/*
* ENOENT means we tried to set the
* congestion algorithm but the algorithm
* specified doesn't exist. This can happen
* if the client and server have different
* congestion algorithms available. In this
* case, print a warning, but otherwise
* continue.
*/
if (errno == ENOENT) {
warning("TCP congestion control algorithm not supported");
}
else {
saved_errno = errno;
close(s);
cleanup_server(test);
errno = saved_errno;
i_errno = IESETCONGESTION;
return -1;
}
}
}
{
socklen_t len = TCP_CA_NAME_MAX;
char ca[TCP_CA_NAME_MAX + 1];
int rc;
rc = getsockopt(s, IPPROTO_TCP, TCP_CONGESTION, ca, &len);
if (rc < 0 && test->congestion) {
saved_errno = errno;
close(s);
cleanup_server(test);
errno = saved_errno;
i_errno = IESETCONGESTION;
return -1;
}
/*
* If not the first connection, discard prior
* congestion algorithm name so we don't leak
* duplicated strings. We probably don't need
* the old string anyway.
*/
if (test->congestion_used != NULL) {
free(test->congestion_used);
}
// Set actual used congestion alg, or set to unknown if could not get it
if (rc < 0)
test->congestion_used = strdup("unknown");
else
test->congestion_used = strdup(ca);
if (test->debug) {
printf("Congestion algorithm is %s\n", test->congestion_used);
}
}
}
#endif /* HAVE_TCP_CONGESTION */
if (rec_streams_accepted != streams_to_rec) {
flag = 0;
++rec_streams_accepted;
} else if (send_streams_accepted != streams_to_send) {
flag = 1;
++send_streams_accepted;
}
if (flag != -1) {
sp = iperf_new_stream(test, s, flag);
if (!sp) {
cleanup_server(test);
return -1;
}
if (sp->sender)
FD_SET(s, &test->write_set);
else
FD_SET(s, &test->read_set);
if (s > test->max_fd) test->max_fd = s;
/*
* If the protocol isn't UDP, or even if it is but
* we're the receiver, set nonblocking sockets.
* We need this to allow a server receiver to
* maintain interactivity with the control channel.
*/
if (test->protocol->id != Pudp ||
!sp->sender) {
setnonblocking(s, 1);
}
if (test->on_new_stream)
test->on_new_stream(sp);
flag = -1;
}
}
FD_CLR(test->prot_listener, &read_set);
}
if (rec_streams_accepted == streams_to_rec && send_streams_accepted == streams_to_send) {
if (test->protocol->id != Ptcp) {
FD_CLR(test->prot_listener, &test->read_set);
close(test->prot_listener);
test->prot_listener = -1;
} else {
if (test->no_delay || test->settings->mss || test->settings->socket_bufsize) {
FD_CLR(test->listener, &test->read_set);
close(test->listener);
test->listener = -1;
if ((s = netannounce(test->settings->domain, Ptcp, test->bind_address, test->bind_dev, test->server_port)) < 0) {
cleanup_server(test);
i_errno = IELISTEN;
return -1;
}
test->listener = s;
FD_SET(test->listener, &test->read_set);
if (test->listener > test->max_fd) test->max_fd = test->listener;
}
}
test->prot_listener = -1;
/* Ensure that total requested data rate is not above limit */
iperf_size_t total_requested_rate = test->num_streams * test->settings->rate * (test->mode == BIDIRECTIONAL? 2 : 1);
if (test->settings->bitrate_limit > 0 && total_requested_rate > test->settings->bitrate_limit) {
if (iperf_get_verbose(test))
iperf_err(test, "Client total requested throughput rate of %" PRIu64 " bps exceeded %" PRIu64 " bps limit",
total_requested_rate, test->settings->bitrate_limit);
cleanup_server(test);
i_errno = IETOTALRATE;
return -1;
}
// Begin calculating CPU utilization
cpu_util(NULL);
if (iperf_set_send_state(test, TEST_START) != 0) {
cleanup_server(test);
return -1;
}
if (iperf_init_test(test) < 0) {
cleanup_server(test);
return -1;
}
if (create_server_timers(test) < 0) {
cleanup_server(test);
return -1;
}
if (create_server_omit_timer(test) < 0) {
cleanup_server(test);
return -1;
}
if (test->mode != RECEIVER)
if (iperf_create_send_timers(test) < 0) {
cleanup_server(test);
return -1;
}
if (iperf_set_send_state(test, TEST_RUNNING) != 0) {
cleanup_server(test);
return -1;
}
}
}
if (test->state == TEST_RUNNING) {
if (test->mode == BIDIRECTIONAL) {
if (iperf_recv(test, &read_set) < 0) {
cleanup_server(test);
return -1;
}
if (iperf_send(test, &write_set) < 0) {
cleanup_server(test);
return -1;
}
} else if (test->mode == SENDER) {
// Reverse mode. Server sends.
if (iperf_send(test, &write_set) < 0) {
cleanup_server(test);
return -1;
}
} else {
// Regular mode. Server receives.
if (iperf_recv(test, &read_set) < 0) {
cleanup_server(test);
return -1;
}
}
}
}
if (result == 0 ||
(timeout != NULL && timeout->tv_sec == 0 && timeout->tv_usec == 0)) {
/* Run the timers. */
iperf_time_now(&now);
tmr_run(&now);
}
}
if (test->json_output) {
if (iperf_json_finish(test) < 0)
return -1;
}
iflush(test);
cleanup_server(test);
if (test->server_affinity != -1)
if (iperf_clearaffinity(test) != 0)
return -1;
return 0;
}
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