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Add bufsize plugin for preparing the DNS Flag Day and avoiding IP fragmentation (#3401)

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* add bufsize plugin

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* add docstring and comment

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* delete stdout messages when get an error

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* change to context.Background from TODO

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* define default bufsize as defaultBufSize constant

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* fix some comments

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* function name change: parse

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>

* function name change: parse

Signed-off-by: ykhr53 <yukihira.lab@gmail.com>
This commit is contained in:
Kohei Yoshida
2019-11-10 08:10:12 +00:00
committed by Miek Gieben
parent 113783ed91
commit e23a34abb4
8 changed files with 234 additions and 0 deletions
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31
plugin/bufsize/bufsize.go Normal file
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@@ -0,0 +1,31 @@
// 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" }