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