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32 lines
757 B
Go
32 lines
757 B
Go
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// Package bufsize implements a plugin that modifies EDNS0 buffer size.
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package bufsize
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import (
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"context"
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"github.com/coredns/coredns/plugin"
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"github.com/miekg/dns"
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)
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// Bufsize implements bufsize plugin.
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type Bufsize struct {
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Next plugin.Handler
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Size int
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}
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// ServeDNS implements the plugin.Handler interface.
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func (buf Bufsize) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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if option := r.IsEdns0(); option != nil {
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option.SetUDPSize(uint16(buf.Size))
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} else {
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// If a client does not use EDNS, add it
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r.SetEdns0(uint16(buf.Size), false)
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}
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return plugin.NextOrFailure(buf.Name(), buf.Next, ctx, w, r)
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}
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// Name implements the Handler interface.
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func (buf Bufsize) Name() string { return "bufsize" }
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