diff --git a/src/domain/messages.rs b/src/domain/messages.rs
new file mode 100644
index 0000000..a0d5df8
--- /dev/null
+++ b/src/domain/messages.rs
@@ -0,0 +1,28 @@
+
+struct LdapMessage {
+    message_id: u32,
+    operation: LdapOperation,
+}
+
+enum LdapOperation {
+    BindRequest(BindRequest),
+    BindResponse(BindResponse),
+    //UnbindRequest(UnbindRequest),
+}
+
+struct BindRequest {
+    version: u8,
+    name: String,
+    authentication: AuthenticationChoice,
+}
+
+enum AuthenticationChoice {
+    Simple(String),
+    // Sasl
+}
+
+struct BindResponse {
+    result_code: u8,
+    matched_dn: String,
+    diagnostic_message: String,
+}
diff --git a/src/domain/mod.rs b/src/domain/mod.rs
new file mode 100644
index 0000000..87a2b7b
--- /dev/null
+++ b/src/domain/mod.rs
@@ -0,0 +1 @@
+mod messages;