tor_guardmgr::guard

Struct CircHistory

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pub(crate) struct CircHistory {
    n_successes: u32,
    n_failures: u32,
    n_indeterminate: u32,
}
Expand description

The recent history of circuit activity on this guard.

We keep this information so that we can tell if too many circuits are winding up in “indeterminate” status.

§What’s this for?

Recall that an “indeterminate” circuit failure is one that might or might not be the guard’s fault. For example, if the second hop of the circuit fails, we can’t tell whether to blame the guard, the second hop, or the internet between them.

But we don’t want to allow an unbounded number of indeterminate failures: if we did, it would allow a malicious guard to simply reject any circuit whose second hop it didn’t like, and thereby filter the client’s paths down to a hostile subset.

So as a workaround, and to discourage this kind of behavior, we track the fraction of indeterminate circuits, and disable any guard where the fraction is too high.

Fields§

§n_successes: u32

How many times have we seen this guard succeed?

§n_failures: u32

How many times have we seen this guard fail?

§n_indeterminate: u32

How many times has this guard given us indeterminate results?

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impl CircHistory

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fn indeterminate_ratio(&self) -> Option<f64>

If we hae seen enough, return the fraction of circuits that have “died under mysterious circumstances”.

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impl Clone for CircHistory

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fn clone(&self) -> CircHistory

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 CircHistory

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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 Default for CircHistory

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fn default() -> CircHistory

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for CircHistory

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Serialize for CircHistory

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more

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