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ttl.go
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ttl.go
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/*
* Copyright (C) 2020-2022, IrineSistiana
*
* This file is part of mosdns.
*
* mosdns is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* mosdns is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package ttl
import (
"context"
"fmt"
"github.com/IrineSistiana/mosdns/v5/pkg/dnsutils"
"github.com/IrineSistiana/mosdns/v5/pkg/query_context"
"github.com/IrineSistiana/mosdns/v5/plugin/executable/sequence"
"strconv"
"strings"
)
const (
PluginType = "ttl"
)
func init() {
sequence.MustRegExecQuickSetup(PluginType, QuickSetup)
}
var _ sequence.Executable = (*TTL)(nil)
type TTL struct {
fix uint32
min uint32
max uint32
}
func NewTTL(fix, min, max uint32) *TTL {
return &TTL{
fix: fix,
min: min,
max: max,
}
}
// QuickSetup format: {[min-max]|[fix]}
// e.g. range "300-600", fixed ttl "5".
func QuickSetup(_ sequence.BQ, s string) (any, error) {
var f, l, u uint32
ls, us, ok := strings.Cut(s, "-")
if ok { // range
n, err := strconv.ParseUint(ls, 10, 32)
if err != nil {
return nil, fmt.Errorf("invalid lower bound, %w", err)
}
l = uint32(n)
n, err = strconv.ParseUint(us, 10, 32)
if err != nil {
return nil, fmt.Errorf("invalid upper bound, %w", err)
}
u = uint32(n)
} else { // fixed
n, err := strconv.ParseUint(s, 10, 32)
if err != nil {
return nil, fmt.Errorf("invalid ttl, %w", err)
}
f = uint32(n)
}
return NewTTL(f, l, u), nil
}
func (t *TTL) Exec(_ context.Context, qCtx *query_context.Context) error {
if r := qCtx.R(); r != nil {
if t.fix > 0 {
dnsutils.SetTTL(r, t.fix)
} else {
if t.min > 0 {
dnsutils.ApplyMinimalTTL(r, t.min)
}
if t.max > 0 {
dnsutils.ApplyMaximumTTL(r, t.max)
}
}
}
return nil
}