32 lines
684 B
Go
32 lines
684 B
Go
package request
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import (
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"github.com/coredns/coredns/plugin/pkg/edns"
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"github.com/miekg/dns"
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)
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func supportedOptions(o []dns.EDNS0) []dns.EDNS0 {
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var supported = make([]dns.EDNS0, 0, 3)
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// For as long as possible try avoid looking up in the map, because that need an Rlock.
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for _, opt := range o {
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switch code := opt.Option(); code {
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case dns.EDNS0NSID:
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fallthrough
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case dns.EDNS0EXPIRE:
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fallthrough
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case dns.EDNS0COOKIE:
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fallthrough
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case dns.EDNS0TCPKEEPALIVE:
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fallthrough
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case dns.EDNS0PADDING:
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supported = append(supported, opt)
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default:
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if edns.SupportedOption(code) {
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supported = append(supported, opt)
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}
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}
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}
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return supported
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}
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