tools: Add a ping application

Ouoroboros ping application mimics the GNU ping application.
do "oping --help" for options.

1 files changed, 162 insertions, 0 deletions

diff --git a/src/tools/oping/oping_server.c b/src/tools/oping/oping_server.c
new file mode 100644
index 00000000..eb0b511b
--- /dev/null
+++ b/src/tools/oping/oping_server.c
@@ -0,0 +1,162 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Ouroboros ping application
+ *
+ *    Dimitri Staessens <dimitri.staessens@intec.ugent.be>
+ *    Sander Vrijders   <sander.vrijders@intec.ugent.be>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/dev.h>
+
+#ifdef __FreeBSD__
+#define __XSI_VISIBLE 500
+#endif
+
+#include <stdlib.h>
+#include <signal.h>
+#include <arpa/inet.h>
+
+void shutdown_server(int signo, siginfo_t * info, void * c)
+{
+        switch(signo) {
+        case SIGINT:
+        case SIGTERM:
+        case SIGHUP:
+                pthread_cancel(server.server_pt);
+                pthread_cancel(server.accept_pt);
+                pthread_cancel(server.cleaner_pt);
+        default:
+                return;
+        }
+}
+
+void * cleaner_thread(void * o)
+{
+        int i = 0;
+        struct timespec now = {0, 0};
+        int deadline_ms = 10000;
+
+        while (true) {
+                clock_gettime(CLOCK_REALTIME, &now);
+                pthread_mutex_lock(&server.lock);
+                for (i = 0; i < OPING_MAX_FLOWS; ++i)
+                        if (ts_diff_ms(&server.times[i], &now) > deadline_ms)
+                                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};
+
+        while (true) {
+
+                int fd = flow_select(NULL);
+                while (!((msg_len = flow_read(fd, buf, OPING_BUF_SIZE)) < 0)) {
+                        if (msg_len < 0)
+                                continue;
+
+                        if (ntohl(msg->type) != ECHO_REQUEST) {
+                                printf("Invalid message received.\n");
+                                continue;
+                        }
+
+                        clock_gettime(CLOCK_REALTIME, &now);
+
+                        pthread_mutex_lock(&server.lock);
+                        server.times[fd] = now;
+                        pthread_mutex_unlock(&server.lock);
+
+                        msg->type = htonl((uint32_t) ECHO_REPLY);
+
+                        if (flow_write(fd, buf, msg_len) < 0) {
+                                printf("Error writing to flow (fd %d).\n", fd);
+                                flow_dealloc(fd);
+                        }
+                }
+        }
+
+        return (void *) 0;
+}
+
+void * accept_thread(void * o)
+{
+        int fd = 0;
+        struct timespec now = {0, 0};
+
+        printf("Ouroboros ping server started.\n");
+
+        while (true) {
+                fd = flow_accept(NULL);
+                if (fd < 0) {
+                        printf("Failed to accept flow.\n");
+                        break;
+                }
+
+                printf("New flow %d.\n", fd);
+
+                if (flow_alloc_resp(fd, 0)) {
+                        printf("Failed to give an allocate response.\n");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                clock_gettime(CLOCK_REALTIME, &now);
+
+                pthread_mutex_lock(&server.lock);
+                server.times[fd] = now;
+                pthread_mutex_unlock(&server.lock);
+
+                flow_cntl(fd, FLOW_F_SETFL, FLOW_O_NONBLOCK);
+        }
+
+        return (void *) 0;
+}
+
+int server_main()
+{
+        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;
+        }
+
+        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.server_pt, NULL);
+        pthread_join(server.accept_pt, NULL);
+        pthread_join(server.cleaner_pt, NULL);
+
+        return 0;
+}