98 lines
2.2 KiB
Go
98 lines
2.2 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 ttl
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import (
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"context"
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"fmt"
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"github.com/IrineSistiana/mosdns/v5/pkg/dnsutils"
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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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"strconv"
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"strings"
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)
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const (
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PluginType = "ttl"
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)
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func init() {
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sequence.MustRegExecQuickSetup(PluginType, QuickSetup)
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}
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var _ sequence.Executable = (*TTL)(nil)
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type TTL struct {
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fix uint32
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min uint32
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max uint32
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}
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func NewTTL(fix, min, max uint32) *TTL {
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return &TTL{
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fix: fix,
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min: min,
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max: max,
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}
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}
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// QuickSetup format: {[min-max]|[fix]}
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// e.g. range "300-600", fixed ttl "5".
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func QuickSetup(_ sequence.BQ, s string) (any, error) {
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var f, l, u uint32
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ls, us, ok := strings.Cut(s, "-")
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if ok { // range
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n, err := strconv.ParseUint(ls, 10, 32)
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if err != nil {
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return nil, fmt.Errorf("invalid lower bound, %w", err)
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}
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l = uint32(n)
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n, err = strconv.ParseUint(us, 10, 32)
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if err != nil {
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return nil, fmt.Errorf("invalid upper bound, %w", err)
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}
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u = uint32(n)
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} else { // fixed
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n, err := strconv.ParseUint(s, 10, 32)
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if err != nil {
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return nil, fmt.Errorf("invalid ttl, %w", err)
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}
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f = uint32(n)
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}
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return NewTTL(f, l, u), nil
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}
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func (t *TTL) Exec(_ context.Context, qCtx *query_context.Context) error {
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if r := qCtx.R(); r != nil {
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if t.fix > 0 {
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dnsutils.SetTTL(r, t.fix)
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} else {
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if t.min > 0 {
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dnsutils.ApplyMinimalTTL(r, t.min)
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}
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if t.max > 0 {
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dnsutils.ApplyMaximumTTL(r, t.max)
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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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