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Add fallback local DNS server for iOS

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世界 2025-02-20 17:18:47 +08:00
parent 7347b930ea
commit 6b88de19d2
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GPG key ID: CD109927C34A63C4
11 changed files with 293 additions and 45 deletions
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78
dns/client.go
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@ -17,7 +17,7 @@ import (
"github.com/sagernet/sing/contrab/freelru"
"github.com/sagernet/sing/contrab/maphash"
"github.com/miekg/dns"
dns "github.com/miekg/dns"
)
var (
@ -484,7 +484,7 @@ func (c *Client) loadResponse(question dns.Question, transport adapter.DNSTransp
func MessageToAddresses(response *dns.Msg) ([]netip.Addr, error) {
if response.Rcode != dns.RcodeSuccess && response.Rcode != dns.RcodeNameError {
return nil, RCodeError(response.Rcode)
return nil, RcodeError(response.Rcode)
}
addresses := make([]netip.Addr, 0, len(response.Answer))
for _, rawAnswer := range response.Answer {
@ -508,10 +508,10 @@ func wrapError(err error) error {
switch dnsErr := err.(type) {
case *net.DNSError:
if dnsErr.IsNotFound {
return RCodeNameError
return RcodeNameError
}
case *net.AddrError:
return RCodeNameError
return RcodeNameError
}
return err
}
@ -561,3 +561,73 @@ func FixedResponse(id uint16, question dns.Question, addresses []netip.Addr, tim
}
return &response
}
func FixedResponseCNAME(id uint16, question dns.Question, record string, timeToLive uint32) *dns.Msg {
response := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: id,
Rcode: dns.RcodeSuccess,
Response: true,
},
Question: []dns.Question{question},
Answer: []dns.RR{
&dns.CNAME{
Hdr: dns.RR_Header{
Name: question.Name,
Rrtype: dns.TypeCNAME,
Class: dns.ClassINET,
Ttl: timeToLive,
},
Target: record,
},
},
}
return &response
}
func FixedResponseTXT(id uint16, question dns.Question, records []string, timeToLive uint32) *dns.Msg {
response := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: id,
Rcode: dns.RcodeSuccess,
Response: true,
},
Question: []dns.Question{question},
Answer: []dns.RR{
&dns.TXT{
Hdr: dns.RR_Header{
Name: question.Name,
Rrtype: dns.TypeA,
Class: dns.ClassINET,
Ttl: timeToLive,
},
Txt: records,
},
},
}
return &response
}
func FixedResponseMX(id uint16, question dns.Question, records []*net.MX, timeToLive uint32) *dns.Msg {
response := dns.Msg{
MsgHdr: dns.MsgHdr{
Id: id,
Rcode: dns.RcodeSuccess,
Response: true,
},
Question: []dns.Question{question},
}
for _, record := range records {
response.Answer = append(response.Answer, &dns.MX{
Hdr: dns.RR_Header{
Name: question.Name,
Rrtype: dns.TypeA,
Class: dns.ClassINET,
Ttl: timeToLive,
},
Preference: record.Pref,
Mx: record.Host,
})
}
return &response
}