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07159c8d87
Signed-off-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net> Signed-off-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net> Co-authored-by: Krzysztof Narkiewicz <knarkiewicz@bloomberg.net>
28 lines
731 B
Go
28 lines
731 B
Go
// Package bufsize implements a plugin that clamps EDNS0 buffer size preventing packet fragmentation.
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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 && int(option.UDPSize()) > buf.Size {
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option.SetUDPSize(uint16(buf.Size))
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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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