tools: Simple echo application

This adds a simple echo application written to show application how to
use the API. It also updates the dev.h header file with the insights
gained from performing this excercise.

1 files changed, 69 insertions, 0 deletions

diff --git a/src/tools/echo/echo_client.c b/src/tools/echo/echo_client.c
new file mode 100644
index 00000000..2f80a52a
--- /dev/null
+++ b/src/tools/echo/echo_client.c
@@ -0,0 +1,69 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * A simple echo application
+ *
+ *    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.
+ */
+
+#define CLIENT_AP_NAME "echo-client"
+
+#include <ouroboros/dev.h>
+#include <ouroboros/rina_name.h>
+
+int client_main()
+{
+        int fd = 0;
+        int result = 0;
+        uint8_t buf[BUF_SIZE];
+        char * message  = "Client says hi!";
+        ssize_t count = 0;
+
+        fd = flow_alloc(SERVER_AP_NAME, NULL,
+                        CLIENT_AP_NAME, NULL,
+                        NULL, 0);
+        if (fd < 0) {
+                printf("Failed to allocate flow\n");
+                return -1;
+        }
+
+        result = flow_alloc_res(fd);
+        if (result < 0) {
+                printf("Flow allocation refused\n");
+                flow_dealloc(fd);
+                return -1;
+        }
+
+        if (flow_write(fd, message, strlen(message) + 1) == -1) {
+                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;
+}