diff --git a/src/intf/config_file.h b/src/intf/config_file.h
new file mode 100644
index 0000000..52bf50e
--- /dev/null
+++ b/src/intf/config_file.h
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+typedef struct KeyValuePair {
+  char *key;
+  char *value;
+  bool loop;
+} keyvaluepair_t;
+
+keyvaluepair_t config_read(FILE *fp);
+void config_write(FILE *fp, char *key, char *value);
diff --git a/src/intf/magic_code.h b/src/intf/magic_code.h
new file mode 100644
index 0000000..efebe83
--- /dev/null
+++ b/src/intf/magic_code.h
@@ -0,0 +1,4 @@
+#pragma once
+
+int MAGIC_CODE_A = 0xbb97dae1;
+int MAGIC_CODE_B = 0xa935e462;
diff --git a/src/intf/melon_vpn_sock.h b/src/intf/melon_vpn_sock.h
new file mode 100644
index 0000000..bcc551c
--- /dev/null
+++ b/src/intf/melon_vpn_sock.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#define SV_DAEMON_SOCK_PATH "/tmp/melonvpndaemon.sock"
+#define SV_RPEERS_SOCK_PATH "/tmp/melonvpnrefreshpeers.sock"
+#define SV_CLIENT_SOCK_PATH "/tmp/melonvpn.sock"
diff --git a/src/intf/open_gui.h b/src/intf/open_gui.h
new file mode 100644
index 0000000..d395e49
--- /dev/null
+++ b/src/intf/open_gui.h
@@ -0,0 +1,4 @@
+#pragma once
+#include <stdbool.h>
+
+int open_gui(int argc, char **argv, bool is_debug);
diff --git a/src/intf/states.h b/src/intf/states.h
new file mode 100644
index 0000000..629779a
--- /dev/null
+++ b/src/intf/states.h
@@ -0,0 +1,7 @@
+#pragma once
+
+typedef enum {
+  CONNECTED,
+  DISCONNECTED,
+  RESTARTING
+} States;
diff --git a/src/intf/statusicon.h b/src/intf/statusicon.h
new file mode 100644
index 0000000..e543d02
--- /dev/null
+++ b/src/intf/statusicon.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <libappindicator/app-indicator.h>
+#include "states.h"
+
+void status_icon_create(GtkWidget *window, char *off, char *on);
+void status_icon_set_state(AppIndicatorStatus state);
diff --git a/src/intf/unix_sockets.h b/src/intf/unix_sockets.h
new file mode 100644
index 0000000..e91c865
--- /dev/null
+++ b/src/intf/unix_sockets.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#define BUF_SIZE 100
+#define BACKLOG 5
+
+int unix_socket_client_start(char *sock_path);
+int unix_socket_server_start(char *sock_path);