Struct ServerReject 

pub struct ServerReject {
    pub marker: [u8; 4],
    pub code: u8,
    pub supported_version: u8,
}

Typed handshake rejection the server returns instead of silently dropping the connection when it structurally cannot satisfy a ClientHello — today, an unknown version. It gives a forward/backward-incompatible peer an actionable signal (the version the server speaks) rather than a bare connection reset.

Downgrade safety. The client surfaces a reject as a hard error and does not auto-retry at the advertised version. Auto-downgrading on an attacker-injected reject would defeat the transcript-bound downgrade resistance of Invariant 7 (the version is signed into the transcript). The reject is diagnostic only; protocol selection stays pinned.

Fields

marker: [u8; 4]

Always SERVER_REJECT_MARKER; lets the client identify the frame.

code: u8

Reject reason — see REJECT_UNSUPPORTED_VERSION.

supported_version: u8

The PROTOCOL_VERSION this server speaks.

Implementations

impl ServerReject

pub fn unsupported_version() -> Self

Build the unsupported-version reject advertising this build’s PROTOCOL_VERSION.

pub fn has_marker(&self) -> bool

True iff the frame carries the reject marker — the client’s guard against treating a same-sized non-reject blob as a reject.

Trait Implementations

impl BorshDeserialize for ServerReject

fn deserialize_reader<__R: Read>(reader: &mut __R) -> Result<Self, Error>

fn deserialize(buf: &mut &[u8]) -> Result<Self, Error>

Deserializes this instance from a given slice of bytes. Updates the buffer to point at the remaining bytes.

fn try_from_slice(v: &[u8]) -> Result<Self, Error>

Deserialize this instance from a slice of bytes.

fn try_from_reader<R>(reader: &mut R) -> Result<Self, Error>

where R: Read,

impl BorshSerialize for ServerReject

fn serialize<__W: Write>(&self, writer: &mut __W) -> Result<(), Error>

impl Clone for ServerReject

fn clone(&self) -> ServerReject

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ServerReject

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ServerReject

impl PartialEq for ServerReject

fn eq(&self, other: &ServerReject) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ServerReject