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derp: tcp-write-timeout=0 should disable write deadline (#14895)

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Updates tailscale/corp#26316

Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Jordan Whited 2025-02-03 15:14:16 -08:00 committed by GitHub
parent 80a100b3cb
commit cfe578870d
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8
derp/derp_server.go
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@ -1827,6 +1827,14 @@ func (c *sclient) setWriteDeadline() {
// of connected peers.
d = privilegedWriteTimeout
}
if d == 0 {
// A zero value should disable the write deadline per
// --tcp-write-timeout docs. The flag should only be applicable for
// non-mesh connections, again per its docs. If mesh happened to use a
// zero value constant above it would be a bug, so we don't bother
// with a condition on c.canMesh.
return
}
// Ignore the error from setting the write deadline. In practice,
// setting the deadline will only fail if the connection is closed
// or closing, so the subsequent Write() will fail anyway.