86 lines
1.7 KiB
Go
86 lines
1.7 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 zone_file
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import (
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"io"
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"os"
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"strings"
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"github.com/miekg/dns"
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)
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type Matcher struct {
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m map[dns.Question][]dns.RR
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}
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func (m *Matcher) LoadFile(s string) error {
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f, err := os.Open(s)
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if err != nil {
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return err
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}
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defer f.Close()
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return m.Load(f)
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}
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func (m *Matcher) Load(r io.Reader) error {
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if m.m == nil {
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m.m = make(map[dns.Question][]dns.RR)
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}
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parser := dns.NewZoneParser(r, "", "")
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parser.SetDefaultTTL(3600)
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for {
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rr, ok := parser.Next()
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if !ok {
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break
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}
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h := rr.Header()
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q := dns.Question{
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Name: strings.ToLower(h.Name),
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Qtype: h.Rrtype,
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Qclass: h.Class,
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}
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m.m[q] = append(m.m[q], rr)
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}
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return parser.Err()
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}
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func (m *Matcher) Search(q dns.Question) []dns.RR {
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q.Name = strings.ToLower(q.Name)
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return m.m[q]
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}
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func (m *Matcher) Reply(q *dns.Msg) *dns.Msg {
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var r *dns.Msg
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for _, question := range q.Question {
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rr := m.Search(question)
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if rr != nil {
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if r == nil {
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r = new(dns.Msg)
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r.SetReply(q)
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}
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r.Answer = append(r.Answer, rr...)
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}
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}
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return r
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}
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