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-resolve: use TXT records to get resolver information

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This commit is contained in:
Frank Denis 2022-03-14 16:11:10 +01:00
parent 0465cd35ef
commit 49c17f8e98
1 changed files with 10 additions and 6 deletions
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16
dnscrypt-proxy/resolve.go
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@ -71,7 +71,7 @@ func Resolve(server string, name string, singleResolver bool) {
cname := name
for once := true; once; once = false {
response, err := resolveQuery(server, myResolverHost, dns.TypeA)
response, err := resolveQuery(server, myResolverHost, dns.TypeTXT)
if err != nil {
fmt.Printf("Unable to resolve: [%s]\n", err)
os.Exit(1)
@ -79,14 +79,18 @@ func Resolve(server string, name string, singleResolver bool) {
fmt.Printf("Resolver : ")
res := make([]string, 0)
for _, answer := range response.Answer {
if answer.Header().Class != dns.ClassINET {
if answer.Header().Class != dns.ClassINET || answer.Header().Rrtype != dns.TypeTXT {
continue
}
var ip string
if answer.Header().Rrtype == dns.TypeA {
ip = answer.(*dns.A).A.String()
} else if answer.Header().Rrtype == dns.TypeAAAA {
ip = answer.(*dns.AAAA).AAAA.String()
for _, txt := range answer.(*dns.TXT).Txt {
if strings.HasPrefix(txt, "Resolver IP: ") {
ip = strings.TrimPrefix(txt, "Resolver IP: ")
break
}
}
if ip == "" {
continue
}
if rev, err := dns.ReverseAddr(ip); err == nil {
response, err = resolveQuery(server, rev, dns.TypePTR)