83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
/*
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* Copyright (C) 2020-2022, IrineSistiana
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*
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* This file is part of mosdns.
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*
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* mosdns is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* mosdns is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package forwardedns0opt
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import (
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"context"
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"strconv"
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"strings"
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"github.com/IrineSistiana/mosdns/v5/pkg/query_context"
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"github.com/IrineSistiana/mosdns/v5/plugin/executable/sequence"
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)
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const PluginType = "forward_edns0opt"
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func init() {
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sequence.MustRegExecQuickSetup(PluginType, QuickSetup)
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}
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var _ sequence.RecursiveExecutable = (*forwarder)(nil)
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type forwarder struct {
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forwardTypCodes map[uint32]struct{}
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}
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func (f *forwarder) Exec(ctx context.Context, qCtx *query_context.Context, next sequence.ChainWalker) error {
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qOpt := qCtx.QOpt()
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clientOpt := qCtx.ClientOpt()
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if clientOpt != nil {
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for _, o := range clientOpt.Option {
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if _, ok := f.forwardTypCodes[uint32(o.Option())]; ok {
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qOpt.Option = append(qOpt.Option, o)
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}
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}
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}
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err := next.ExecNext(ctx, qCtx)
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if err != nil {
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return err
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}
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upstreamOpt := qCtx.UpstreamOpt()
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respOpt := qCtx.RespOpt()
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if upstreamOpt != nil && respOpt != nil {
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for _, o := range upstreamOpt.Option {
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if _, ok := f.forwardTypCodes[uint32(o.Option())]; ok {
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respOpt.Option = append(respOpt.Option, o)
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}
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}
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}
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return nil
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}
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// Format: [DNS EDNS0 Option Code] ...
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func QuickSetup(_ sequence.BQ, numbers string) (any, error) {
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m := make(map[uint32]struct{})
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for _, s := range strings.Fields(numbers) {
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n, err := strconv.ParseUint(s, 10, 16)
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if err != nil {
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return nil, err
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}
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m[uint32(n)] = struct{}{}
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}
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return &forwarder{forwardTypCodes: m}, nil
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}
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