Added base code and command line.

src/xdpfw_loader.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <getopt.h>
+#include <signal.h>
+#include <inttypes.h>
+
+#include "../libbpf/src/bpf.h"
+#include "../libbpf/src/libbpf.h"
+
+#include "include/xdpfw.h"
+#include "include/config.h"
+
+// Command line variables.
+static char *configFile;
+static int help = 0;
+
+const struct option opts[] =
+{
+    {"config", required_argument, NULL, 'c'},
+    {"help", no_argument, &help, 'h'},
+    {NULL, 0, NULL, 0}
+};
+
+void parse_command_line(int argc, char *argv[])
+{
+    int c;
+
+    while ((c = getopt_long(argc, argv, "c:h", opts, 0)) != -1)
+    {
+        switch (c)
+        {
+            case 'c':
+                configFile = optarg;
+
+                break;
+
+            case '?':
+                fprintf(stderr, "Missing argument option...\n");
+
+                break;
+        }
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    // Parse the command line.
+    parse_command_line(argc, argv);
+
+    // Check for help menu.
+    if (help)
+    {
+        fprintf(stdout, "Usage:\n" \
+            "--config -c => Config file location (default is /etc/xdpfw.conf).\n" \
+            "--help -h => Print help menu.\n");
+
+        exit(0);
+    }
+
+    // Check for --config argument.
+    if (configFile == NULL)
+    {
+        // Assign default.
+        configFile = "/etc/xdpfw.conf";
+    }
+
+    // Exit program successfully.
+    exit(1);
+}