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response.go
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response.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 msg_matcher
import (
"context"
"github.com/IrineSistiana/mosdns/v4/pkg/matcher/domain"
"github.com/IrineSistiana/mosdns/v4/pkg/matcher/elem"
"github.com/IrineSistiana/mosdns/v4/pkg/matcher/netlist"
"github.com/IrineSistiana/mosdns/v4/pkg/query_context"
"github.com/miekg/dns"
"net"
"net/netip"
)
type AAAAAIPMatcher struct {
ipMatcher netlist.Matcher
}
func NewAAAAAIPMatcher(ipMatcher netlist.Matcher) *AAAAAIPMatcher {
return &AAAAAIPMatcher{ipMatcher: ipMatcher}
}
func (m *AAAAAIPMatcher) Match(_ context.Context, qCtx *query_context.Context) (bool, error) {
r := qCtx.R()
if r == nil {
return false, nil
}
return m.MatchMsg(r)
}
func (m *AAAAAIPMatcher) MatchMsg(msg *dns.Msg) (bool, error) {
for _, rr := range msg.Answer {
var ip net.IP
switch rr := rr.(type) {
case *dns.A:
ip = rr.A
case *dns.AAAA:
ip = rr.AAAA
default:
continue
}
addr, _ := netip.AddrFromSlice(ip)
matched, err := m.ipMatcher.Match(addr)
if err != nil {
return false, err
}
if matched {
return true, nil
}
}
return false, nil
}
type CNameMatcher struct {
domainMatcher domain.Matcher[struct{}]
}
func NewCNameMatcher(domainMatcher domain.Matcher[struct{}]) *CNameMatcher {
return &CNameMatcher{domainMatcher: domainMatcher}
}
func (m *CNameMatcher) Match(_ context.Context, qCtx *query_context.Context) (matched bool, _ error) {
r := qCtx.R()
if r == nil {
return false, nil
}
return m.MatchMsg(r), nil
}
func (m *CNameMatcher) MatchMsg(msg *dns.Msg) bool {
for _, rr := range msg.Answer {
if cname, ok := rr.(*dns.CNAME); ok {
if _, ok := m.domainMatcher.Match(cname.Target); ok {
return true
}
}
}
return false
}
type RCodeMatcher struct {
elemMatcher *elem.IntMatcher
}
func NewRCodeMatcher(elemMatcher *elem.IntMatcher) *RCodeMatcher {
return &RCodeMatcher{elemMatcher: elemMatcher}
}
func (m *RCodeMatcher) Match(_ context.Context, qCtx *query_context.Context) (matched bool, _ error) {
r := qCtx.R()
if r == nil {
return false, nil
}
return m.MatchMsg(r), nil
}
func (m *RCodeMatcher) MatchMsg(msg *dns.Msg) bool {
return m.elemMatcher.Match(msg.Rcode)
}