forked from txthinking/brook
/
thedns.go
207 lines (199 loc) · 5.38 KB
/
thedns.go
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// Copyright (c) 2016-present Cloud <cloud@txthinking.com>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 3 of the GNU General Public
// License as published by the Free Software Foundation.
//
// This program 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 thedns
import (
"net"
"net/http"
"strings"
"time"
"github.com/miekg/dns"
"github.com/patrickmn/go-cache"
"github.com/likev/brook"
)
type TheDNS struct {
BlockDomain map[string]byte
BypassDomain map[string]byte
BypassDNSClient *brook.DNSClient
BypassDOHClient *brook.DOHClient
DisableA bool
DisableAAAA bool
Cache *cache.Cache
DOHClient *brook.DOHClient
}
func NewTheDNS(blockDomainList, bypassDomainList, bypassDNS string, disableA, disableAAAA bool, doh string) (*TheDNS, error) {
var err error
var ds map[string]byte
if blockDomainList != "" {
ds, err = brook.ReadDomainList(blockDomainList)
if err != nil {
return nil, err
}
}
var ds1 map[string]byte
if bypassDomainList != "" {
ds1, err = brook.ReadDomainList(bypassDomainList)
if err != nil {
return nil, err
}
}
var c *brook.DNSClient
var bdc, dc *brook.DOHClient
if !strings.HasPrefix(bypassDNS, "https://") {
c = &brook.DNSClient{Server: bypassDNS}
}
if strings.HasPrefix(bypassDNS, "https://") {
bdc, err = brook.NewDOHClient(bypassDNS)
if err != nil {
return nil, err
}
}
if doh != "" {
dc, err = brook.NewDOHClient(doh)
if err != nil {
return nil, err
}
}
b := &TheDNS{
BlockDomain: ds,
BypassDomain: ds1,
BypassDNSClient: c,
BypassDOHClient: bdc,
DisableA: disableA,
DisableAAAA: disableAAAA,
Cache: cache.New(cache.NoExpiration, cache.NoExpiration),
DOHClient: dc,
}
return b, nil
}
func soa(addr *net.UDPAddr, m *dns.Msg, l1 *net.UDPConn) error {
m1 := &dns.Msg{}
m1.SetReply(m)
m1.Authoritative = true
m1.Answer = append(m1.Answer, &dns.SOA{
Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 60},
Ns: "txthinking.com.",
Mbox: "cloud.txthinking.com.",
Serial: uint32((time.Now().Year() * 10000) + (int(time.Now().Month()) * 100) + (time.Now().Day())*100),
Refresh: 21600,
Retry: 3600,
Expire: 259200,
Minttl: 300,
})
m1b, err := m1.PackBuffer(nil)
if err != nil {
return err
}
if _, err := l1.WriteToUDP(m1b, addr); err != nil {
return err
}
return nil
}
func soah(m *dns.Msg, w http.ResponseWriter) error {
m1 := &dns.Msg{}
m1.SetReply(m)
m1.Authoritative = true
m1.Answer = append(m1.Answer, &dns.SOA{
Hdr: dns.RR_Header{Name: m.Question[0].Name, Rrtype: dns.TypeSOA, Class: dns.ClassINET, Ttl: 60},
Ns: "txthinking.com.",
Mbox: "cloud.txthinking.com.",
Serial: uint32((time.Now().Year() * 10000) + (int(time.Now().Month()) * 100) + (time.Now().Day())*100),
Refresh: 21600,
Retry: 3600,
Expire: 259200,
Minttl: 300,
})
m1b, err := m1.PackBuffer(nil)
if err != nil {
return err
}
w.Header().Set("Content-Type", "application/dns-message")
w.Write(m1b)
return nil
}
func (p *TheDNS) TouchBrook() {
f := brook.DNSGate
brook.DNSGate = func(addr *net.UDPAddr, m *dns.Msg, l1 *net.UDPConn) (bool, error) {
done, err := f(addr, m, l1)
if err != nil || done {
return done, err
}
if m.Question[0].Qtype == dns.TypeA && p.DisableA {
err := soa(addr, m, l1)
return err == nil, err
}
if m.Question[0].Qtype == dns.TypeAAAA && p.DisableAAAA {
err := soa(addr, m, l1)
return err == nil, err
}
if brook.ListHasDomain(p.BlockDomain, m.Question[0].Name[0:len(m.Question[0].Name)-1], p.Cache) {
err := soa(addr, m, l1)
return err == nil, err
}
if brook.ListHasDomain(p.BypassDomain, m.Question[0].Name[0:len(m.Question[0].Name)-1], p.Cache) {
var m1 *dns.Msg
if p.BypassDNSClient != nil {
m1, err = p.BypassDNSClient.Exchange(m)
}
if p.BypassDOHClient != nil {
m1, err = p.BypassDOHClient.Exchange(m)
}
if err != nil {
return false, err
}
m1b, err := m1.PackBuffer(nil)
if err != nil {
return false, err
}
if _, err := l1.WriteToUDP(m1b, addr); err != nil {
return false, err
}
return true, nil
}
if p.DOHClient != nil {
m1, err := p.DOHClient.Exchange(m)
if err != nil {
return false, err
}
m1b, err := m1.PackBuffer(nil)
if err != nil {
return false, err
}
if _, err := l1.WriteToUDP(m1b, addr); err != nil {
return false, err
}
return true, nil
}
return false, nil
}
f1 := brook.DOHGate
brook.DOHGate = func(m *dns.Msg, w http.ResponseWriter, r *http.Request) (done bool, err error) {
done, err = f1(m, w, r)
if err != nil || done {
return done, err
}
if m.Question[0].Qtype == dns.TypeA && p.DisableA {
err := soah(m, w)
return err == nil, err
}
if m.Question[0].Qtype == dns.TypeAAAA && p.DisableAAAA {
err := soah(m, w)
return err == nil, err
}
if brook.ListHasDomain(p.BlockDomain, m.Question[0].Name[0:len(m.Question[0].Name)-1], p.Cache) {
err := soah(m, w)
return err == nil, err
}
return false, nil
}
}