ipcpd: Add broadcast IPCP

This adds a broadcast IPCP that allows us to easily create multicast
applications. The broadcast IPCP accepts flows for "<layer_name>.mc".
A tool, obc (Ouroboros broadcast), is added that sends and reads a
message to a broadcast layer.

Signed-off-by: Dimitri Staessens <dimitri.staessens@ugent.be>
Signed-off-by: Sander Vrijders <sander.vrijders@ugent.be>

1 files changed, 154 insertions, 0 deletions

diff --git a/src/tools/obc/obc.c b/src/tools/obc/obc.c
new file mode 100644
index 00000000..747d01d3
--- /dev/null
+++ b/src/tools/obc/obc.c
@@ -0,0 +1,154 @@
+/*
+ * 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;
+}