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/*
* Ouroboros - Copyright (C) 2016 - 2024
*
* Ouroboros ping application
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
void shutdown_server(int signo, siginfo_t * info, void * c)
{
(void) info;
(void) c;
switch(signo) {
case SIGINT:
case SIGTERM:
case SIGHUP:
pthread_cancel(server.accept_pt);
default:
return;
}
}
void * cleaner_thread(void * o)
{
int i = 0;
struct timespec now = {0, 0};
int deadline_ms = 10000;
(void) o;
while (true) {
clock_gettime(CLOCK_REALTIME, &now);
for (i = 0; i < OPING_MAX_FLOWS; ++i)
if (fset_has(server.flows, i)) {
time_t diff;
pthread_mutex_lock(&server.lock);
diff = ts_diff_ms(&server.times[i], &now);
pthread_mutex_unlock(&server.lock);
if (diff > deadline_ms) {
printf("Flow %d timed out.\n", i);
fset_del(server.flows, i);
flow_dealloc(i);
}
}
sleep(1);
}
}
void * server_thread(void *o)
{
char buf[OPING_BUF_SIZE];
int msg_len = 0;
struct oping_msg * msg = (struct oping_msg *) buf;
struct timespec now = {0, 0};
struct timespec timeout = {0, 100 * MILLION};
int fd;
(void) o;
while (true) {
if (fevent(server.flows, server.fq, &timeout) == -ETIMEDOUT)
continue;
while ((fd = fqueue_next(server.fq)) >= 0) {
msg_len = flow_read(fd, buf, OPING_BUF_SIZE);
if (msg_len < 0)
continue;
if (ntohl(msg->type) != ECHO_REQUEST) {
printf("Invalid message on fd %d.\n", fd);
continue;
}
if (!server.quiet)
printf("Received %d bytes on fd %d.\n", msg_len, fd);
clock_gettime(CLOCK_REALTIME, &now);
pthread_mutex_lock(&server.lock);
server.times[fd] = now;
pthread_mutex_unlock(&server.lock);
msg->type = htonl(ECHO_REPLY);
if (flow_write(fd, buf, msg_len) < 0)
printf("Error writing to flow (fd %d).\n", fd);
}
}
return (void *) 0;
}
void * accept_thread(void * o)
{
int fd;
struct timespec now;
qosspec_t qs;
(void) o;
printf("Ouroboros ping server started.\n");
while (true) {
fd = flow_accept(&qs, NULL);
if (fd < 0) {
printf("Failed to accept flow.\n");
break;
}
printf("New flow %d.\n", fd);
clock_gettime(CLOCK_REALTIME, &now);
fset_add(server.flows, fd);
pthread_mutex_lock(&server.lock);
server.times[fd] = now;
pthread_mutex_unlock(&server.lock);
fccntl(fd, FLOWSFLAGS,
FLOWFRNOBLOCK | FLOWFRDWR | FLOWFRNOPART);
}
return (void *) 0;
}
int server_main(void)
{
struct sigaction sig_act;
memset(&sig_act, 0, sizeof sig_act);
sig_act.sa_sigaction = &shutdown_server;
sig_act.sa_flags = 0;
if (sigaction(SIGINT, &sig_act, NULL) ||
sigaction(SIGTERM, &sig_act, NULL) ||
sigaction(SIGHUP, &sig_act, NULL) ||
sigaction(SIGPIPE, &sig_act, NULL)) {
printf("Failed to install sighandler.\n");
return -1;
}
server.flows = fset_create();
if (server.flows == NULL)
return 0;
server.fq = fqueue_create();
if (server.fq == NULL) {
fset_destroy(server.flows);
return -1;
}
pthread_create(&server.cleaner_pt, NULL, cleaner_thread, NULL);
pthread_create(&server.accept_pt, NULL, accept_thread, NULL);
pthread_create(&server.server_pt, NULL, server_thread, NULL);
pthread_join(server.accept_pt, NULL);
pthread_cancel(server.server_pt);
pthread_cancel(server.cleaner_pt);
fset_destroy(server.flows);
fqueue_destroy(server.fq);
pthread_join(server.server_pt, NULL);
pthread_join(server.cleaner_pt, NULL);
return 0;
}
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