mirror of
https://github.com/Control-D-Inc/ctrld.git
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fc527dbdfb
So setting up logging for ctrld binary and ctrld packages could be done more easily, decouple the required setup for interactive vs daemon running. This is the first step toward replacing rs/zerolog libary with a different logging library.
56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
package ctrld
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import (
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"context"
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"sync"
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"sync/atomic"
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"time"
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"tailscale.com/net/netmon"
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ctrldnet "github.com/Control-D-Inc/ctrld/internal/net"
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)
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var (
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hasIPv6Once sync.Once
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ipv6Available atomic.Bool
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)
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// HasIPv6 reports whether the current network stack has IPv6 available.
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func HasIPv6(ctx context.Context) bool {
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hasIPv6Once.Do(func() {
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logger := LoggerFromCtx(ctx)
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logger.Debug().Msg("checking for IPv6 availability once")
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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val := ctrldnet.IPv6Available(ctx)
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ipv6Available.Store(val)
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logger.Debug().Msgf("ipv6 availability: %v", val)
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mon, err := netmon.New(func(format string, args ...any) {})
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if err != nil {
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logger.Debug().Err(err).Msg("failed to monitor IPv6 state")
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return
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}
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mon.RegisterChangeCallback(func(delta *netmon.ChangeDelta) {
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old := ipv6Available.Load()
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cur := delta.Monitor.InterfaceState().HaveV6
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if old != cur {
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logger.Warn().Msgf("ipv6 availability changed, old: %v, new: %v", old, cur)
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} else {
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logger.Debug().Msg("ipv6 availability does not changed")
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}
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ipv6Available.Store(cur)
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})
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mon.Start()
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})
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return ipv6Available.Load()
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}
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// DisableIPv6 marks IPv6 as unavailable if enabled.
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func DisableIPv6(ctx context.Context) {
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if ipv6Available.CompareAndSwap(true, false) {
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logger := LoggerFromCtx(ctx)
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logger.Debug().Msg("turned off IPv6 availability")
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}
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}
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