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feat(client): try restricted proxy if NAT unknown

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Just once, to offload unrestricted proxies.
This is useful when our STUN servers are blocked or don't support
the NAT discovery feature, or if they're just slow.

Closes https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40178.
Partially addresses https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake/-/issues/40376

Signed-off-by: Cecylia Bocovich <cohosh@torproject.org>
This commit is contained in:
WofWca 2024-12-04 19:14:46 +04:00 • committed by Cecylia Bocovich
parent f6767061e4
commit 94b6647d33
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4 changed files with 163 additions and 27 deletions
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4
client/lib/snowflake.go
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@ -156,12 +156,14 @@ func NewSnowflakeClient(config ClientConfig) (*Transport, error) {
}
go updateNATType(iceServers, broker, config.CommunicationProxy)
natPolicy := &NATPolicy{}
max := 1
if config.Max > max {
max = config.Max
}
eventsLogger := event.NewSnowflakeEventDispatcher()
transport := &Transport{dialer: NewWebRTCDialerWithEventsAndProxy(broker, iceServers, max, eventsLogger, config.CommunicationProxy), eventDispatcher: eventsLogger}
transport := &Transport{dialer: NewWebRTCDialerWithNatPolicyAndEventsAndProxy(broker, natPolicy, iceServers, max, eventsLogger, config.CommunicationProxy), eventDispatcher: eventsLogger}
return transport, nil
}