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24 lines
596 B
Go
24 lines
596 B
Go
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package mox
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import (
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"errors"
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"net"
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"reflect"
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)
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func AsTLSAlert(err error) (alert uint8, ok bool) {
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// If the remote client aborts the connection, it can send an alert indicating why.
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// crypto/tls gives us a net.OpError with "Op" set to "remote error", an an Err
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// with the unexported type "alert", a uint8. So we try to read it.
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var opErr *net.OpError
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if !errors.As(err, &opErr) || opErr.Op != "remote error" || opErr.Err == nil {
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return
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}
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v := reflect.ValueOf(opErr.Err)
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if v.Kind() != reflect.Uint8 || v.Type().Name() != "alert" {
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return
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}
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return uint8(v.Uint()), true
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}
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