1 files changed, 152 insertions, 0 deletions
diff --git a/src/tools/oecho/oecho.c b/src/tools/oecho/oecho.c
new file mode 100644
index 00000000..3896a85a
--- /dev/null
+++ b/src/tools/oecho/oecho.c
@@ -0,0 +1,152 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2018
+ *
+ * A simple echo 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 <string.h>
+
+#define BUF_SIZE 256
+
+static void usage(void)
+{
+        printf("Usage: echo-app [OPTION]...\n"
+               "Sends an echo between a server and a client\n\n"
+               "  -l, --listen              Run in server mode\n"
+               "      --help                Display this help text and exit\n");
+}
+
+int server_main(void)
+{
+        int     fd = 0;
+        char    buf[BUF_SIZE];
+        ssize_t count = 0;
+
+        printf("Starting the server.\n");
+
+        while (true) {
+                fd = flow_accept(NULL, NULL);
+                if (fd < 0) {
+                        printf("Failed to accept flow.\n");
+                        break;
+                }
+
+                printf("New flow.\n");
+
+                count = flow_read(fd, &buf, BUF_SIZE);
+                if (count < 0) {
+                        printf("Failed to read SDU.\n");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                printf("Message from client is %.*s.\n", (int) count, buf);
+
+                if (flow_write(fd, buf, count) == -1) {
+                        printf("Failed to write SDU.\n");
+                        flow_dealloc(fd);
+                        continue;
+                }
+
+                flow_dealloc(fd);
+        }
+
+        return 0;
+}
+
+int client_main(void)
+{
+        int     fd      = 0;
+        char    buf[BUF_SIZE];
+        char *  message = "Client says hi!";
+        ssize_t count   = 0;
+
+        fd = flow_alloc("echo", NULL, NULL);
+        if (fd < 0) {
+                printf("Failed to allocate flow.\n");
+                return -1;
+        }
+
+        if (flow_write(fd, message, strlen(message) + 1) < 0) {
+                printf("Failed to write SDU.\n");
+                flow_dealloc(fd);
+                return -1;
+        }
+
+        count = flow_read(fd, buf, BUF_SIZE);
+        if (count < 0) {
+                printf("Failed to read SDU.\n");
+                flow_dealloc(fd);
+                return -1;
+        }
+
+        printf("Server replied with %.*s\n", (int) count, buf);
+
+        flow_dealloc(fd);
+
+        return 0;
+}
+
+int main(int argc, char ** argv)
+{
+        int ret = -1;
+        bool server = false;
+
+        argc--;
+        argv++;
+        while (argc > 0) {
+                if (strcmp(*argv, "-l") == 0 ||
+                    strcmp(*argv, "--listen") == 0) {
+                        server = true;
+                } else {
+                        usage();
+                        return 0;
+                }
+                argc--;
+                argv++;
+        }
+
+        if (server)
+                ret = server_main();
+        else
+                ret = client_main();
+
+        return ret;
+}