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https://github.com/Control-D-Inc/ctrld.git
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efb5a92571
A backoff with small max time will flood requests to Control D server, causing false positive for abuse mitiation system. While a big max time will cause ctrld not realize network change as fast as possible. While at it, also sync DoH3 code with DoH code, ensuring no others place can trigger requests flooding for ipv6 probing.
50 lines
995 B
Go
50 lines
995 B
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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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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const ipv6ProbingInterval = 10 * time.Second
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func hasIPv6() bool {
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hasIPv6Once.Do(func() {
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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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go probingIPv6(context.TODO(), val)
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})
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return ipv6Available.Load()
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}
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// TODO(cuonglm): doing poll check natively for supported platforms.
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func probingIPv6(ctx context.Context, old bool) {
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ticker := time.NewTicker(ipv6ProbingInterval)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-ticker.C:
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func() {
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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cur := ctrldnet.IPv6Available(ctx)
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if ipv6Available.CompareAndSwap(old, cur) {
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old = cur
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}
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}()
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}
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}
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}
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