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When the network link changes, existing UDP sockets fail immediately and permanently on macOS. The forwarder set up a single UDP conn and never changed it. As a result, any time there was a network link change, all forwarded DNS queries failed. To fix this, create a new connection when send requests fail because of network unreachability. This change is darwin-only, although extended it to other platforms should be straightforward. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
26 lines
582 B
Go
26 lines
582 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package tsdns
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import (
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"errors"
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"syscall"
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)
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// Avoid allocation when calling errors.Is below
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// by converting syscall.Errno to error here.
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var (
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networkDown error = syscall.ENETDOWN
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networkUnreachable error = syscall.ENETUNREACH
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)
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func networkIsDown(err error) bool {
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return errors.Is(err, networkDown)
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}
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func networkIsUnreachable(err error) bool {
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return errors.Is(err, networkUnreachable)
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}
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