tor_cell::relaycell::msg

Struct Sendme

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pub struct Sendme {
    tag: Option<SendmeTag>,
}
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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§tag: Option<SendmeTag>

A tag value authenticating the previously received data.

Implementations§

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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

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: 'a,

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fn explicit(self, class: Class, tag: u32) -> TaggedParser<'a, Explicit, Self, E>

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impl<'a, T, E> AsTaggedImplicit<'a, E> for T
where T: 'a,

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fn implicit( self, class: Class, constructed: bool, tag: u32, ) -> TaggedParser<'a, Implicit, Self, E>

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Immutably borrows from an owned value. Read more
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Mutably borrows from an owned value. Read more
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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fn memory_cost(&self, et: EnabledToken) -> usize

Returns the memory cost of self, in bytes Read more
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