/* * Ouroboros - Copyright (C) 2016 - 2020 * * Ouroboros ping application * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * 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); pthread_mutex_lock(&server.lock); for (i = 0; i < OPING_MAX_FLOWS; ++i) if (fset_has(server.flows, i) && ts_diff_ms(&server.times[i], &now) > deadline_ms) { printf("Flow %d timed out.\n", i); fset_del(server.flows, i); flow_dealloc(i); } pthread_mutex_unlock(&server.lock); 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; } 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); pthread_mutex_lock(&server.lock); fset_add(server.flows, fd); 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; }