feat: add initial draft of reliable protocol

crates/scion/Cargo.toml

@@ -5,8 +5,6 @@ edition = "2021"
 publish = false
 
 [dependencies]
-serde = { version = "1.0.188", features = ["derive"] }
-thiserror = "1.0.48"
 bytes = "1.4.0"
 serde = { version = "1.0.188", features = ["derive"] }
 thiserror = "1.0.48"

crates/scion/src/address/host.rs

@@ -45,6 +45,12 @@ impl HostType {
     }
 }
 
+impl From<HostType> for u8 {
+    fn from(value: HostType) -> Self {
+        value as u8
+    }
+}
+
 /// Trait to be implemented by address types that are supported by SCION
 /// as valid AS-host addresses.
 pub trait HostAddress {

crates/scion/src/address/service.rs

@@ -30,7 +30,7 @@ impl ServiceAddress {
 
     #[allow(unused)]
     /// Special none service address value.
-    const NONE: Self = Self(0xffff);
+    pub(crate) const NONE: Self = Self(0xffff);
     /// Flag bit indicating whether the address includes multicast
     const MULTICAST_FLAG: u16 = 0x8000;
 
@@ -103,6 +103,12 @@ impl FromStr for ServiceAddress {
     }
 }
 
+impl From<ServiceAddress> for u16 {
+    fn from(value: ServiceAddress) -> Self {
+        value.0
+    }
+}
+
 impl Display for ServiceAddress {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         match self.anycast() {

crates/scion/src/lib.rs

@@ -1,3 +1,6 @@
 pub mod address;
 pub mod daemon;
 pub mod reliable;
+
+#[cfg(test)]
+pub(crate) mod test_utils;

crates/scion/src/reliable.rs

@@ -1,13 +1,12 @@
 mod error;
-mod host_address;
-mod message;
-mod registration;
-mod relay_protocol;
-
 pub use error::ReliableRelayError;
+
+mod relay_protocol;
 pub use relay_protocol::ReliableRelayProtocol;
 
-const IPV4_OCTETS: usize = 4;
-const IPV6_OCTETS: usize = 16;
-const LAYER4_PORT_OCTETS: usize = 2;
+mod common_header;
+mod parser;
+mod registration;
+mod wire_utils;
+
 const ADDRESS_TYPE_OCTETS: usize = 1;