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+/*
+ * Ouroboros - Copyright (C) 2016 - 2018
+ *
+ * A simple broadcast 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.
+ */
+
+#define _POSIX_C_SOURCE 199309L
+
+#include <ouroboros/dev.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUF_SIZE 256
+
+static void usage(void)
+{
+ printf("Usage: obc [OPTION]...\n"
+ "Sends a message to a broadcast network\n\n"
+ " -n --name Name of the broadcast layer\n"
+ " -m --message A message to send\n"
+ " [-l, --listen Listen mode]\n"
+ " --help Display this help text and exit\n");
+}
+
+static int reader_main(const char * dst)
+{
+ int fd;
+ char buf[BUF_SIZE];
+
+ printf("Starting a reader.\n");
+
+ fd = flow_alloc(dst, NULL, NULL);
+ if (fd < 0) {
+ printf("Failed to allocate multicast flow.\n");
+ return -1;
+ }
+
+ printf("New flow.\n");
+
+ while (true) {
+ ssize_t count = flow_read(fd, &buf, BUF_SIZE);
+ if (count < 0) {
+ printf("Failed to read.\n");
+ flow_dealloc(fd);
+ break;
+ }
+
+ printf("Message is %.*s.\n", (int) count, buf);
+ }
+
+ return 0;
+}
+
+static int writer_main(const char * dst,
+ const char * message)
+{
+ int fd = 0;
+
+ fd = flow_alloc(dst, NULL, NULL);
+ if (fd < 0) {
+ printf("Failed to allocate multicast flow.\n");
+ return -1;
+ }
+
+ if (flow_write(fd, message, strlen(message) + 1) < 0) {
+ printf("Failed to write packet.\n");
+ flow_dealloc(fd);
+ return -1;
+ }
+
+ flow_dealloc(fd);
+
+ return 0;
+}
+
+int main(int argc,
+ char ** argv)
+{
+ int ret = -1;
+ bool reader = false;
+ char * name = NULL;
+ char * msg = "Ouroboros multicast rocks!";
+
+ argc--;
+ argv++;
+ while (argc > 0) {
+ if (strcmp(*argv, "-l") == 0 ||
+ strcmp(*argv, "--listen") == 0) {
+ reader = true;
+ } else if (strcmp(*argv, "-n") == 0 ||
+ strcmp(*argv, "--name") == 0) {
+ name = *(argv + 1);
+ argc--;
+ argv++;
+ } else if (strcmp(*argv, "-m") == 0 ||
+ strcmp(*argv, "--message") == 0) {
+ msg = *(argv + 1);
+ argc--;
+ argv++;
+ } else {
+ usage();
+ return 0;
+ }
+ argc--;
+ argv++;
+ }
+
+ if (name == NULL) {
+ printf("Please specify a name.\n\n");
+ usage();
+ exit(EXIT_FAILURE);
+ }
+
+ if (reader)
+ ret = reader_main(name);
+ else
+ ret = writer_main(name, msg);
+
+ return ret;
+}