Sendme

tor_cell::relaycell::msg

Struct Sendme 

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pub struct Sendme { /* private fields */ }
Expand description

A Sendme message is used to increase flow-control windows.

To avoid congestion, each Tor circuit and stream keeps track of a number of data cells that it is willing to send. It decrements these numbers every time it sends a cell. If these numbers reach zero, then no more cells can be sent on the stream or circuit.

The only way to re-increment these numbers is by receiving a Sendme cell from the other end of the circuit or stream.

For security, current circuit-level Sendme cells include an authentication tag that proves knowledge of the cells that they are acking.

See tor-spec.txt for more information; also see the source for tor_proto::circuit::sendme.

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impl Sendme

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pub fn new_empty() -> Self

Return a new empty sendme cell

This format is used on streams, and on circuits without sendme authentication.

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pub fn new_tag(x: [u8; 20]) -> Self

This format is used on circuits with sendme authentication.

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pub fn into_sendme_tag(self) -> Option<SendmeTag>

Consume this cell and return its authentication tag, if any

Trait Implementations§

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impl Body for Sendme

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fn decode_from_reader(r: &mut Reader<'_>) -> Result<Self>

Decode a relay cell body from a provided reader.
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fn encode_onto<W: Writer + ?Sized>(self, w: &mut W) -> EncodeResult<()>

Encode the body of this cell into the end of a writer.
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impl Clone for Sendme

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fn clone(&self) -> Sendme

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Sendme

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

Formats the value using the given formatter. Read more
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impl From<Sendme> for AnyRelayMsg

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fn from(m: Sendme) -> AnyRelayMsg

Converts to this type from the input type.
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impl From<SendmeTag> for Sendme

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fn from(value: SendmeTag) -> Self

Converts to this type from the input type.
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impl HasMemoryCostStructural for Sendme

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fn indirect_memory_cost(&self, et: EnabledToken) -> usize

Memory cost of data stored out-of-line Read more
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impl RelayMsg for Sendme

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fn cmd(&self) -> RelayCmd

Return the stream command associated with this message.
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fn encode_onto<W: Writer + ?Sized>(self, w: &mut W) -> EncodeResult<()>

Encode the body of this message, not including command or length
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fn decode_from_reader(cmd: RelayCmd, r: &mut Reader<'_>) -> Result<Self>

Extract the body of a message with command cmd from reader r.
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impl TryFrom<AnyRelayMsg> for Sendme

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(msg: AnyRelayMsg) -> Result<Sendme>

Performs the conversion.

Auto Trait Implementations§

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impl Freeze for Sendme

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impl RefUnwindSafe for Sendme

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impl Send for Sendme

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impl Sync for Sendme

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impl Unpin for Sendme

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impl UnwindSafe for Sendme

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 21 bytes