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package main
import (
"fmt"
"strings"
"io/ioutil"
"encoding/json"
"net/http"
"go.wit.com/log"
"github.com/miekg/dns"
)
// dnsLookupDoH performs a DNS lookup for AAAA records over HTTPS.
func lookupDoH(hostname string, rrType string) []string {
var values []string
// Construct the URL for a DNS query with Google's DNS-over-HTTPS API
url := fmt.Sprintf("https://dns.google.com/resolve?name=%s&type=%s", hostname, rrType)
log.Log(DNS, "lookupDoH()", url)
if hostname == "" {
log.Warn("lookupDoH() was sent a empty hostname")
return nil
}
// Perform the HTTP GET request
resp, err := http.Get(url)
if err != nil {
log.Error(err, "error performing DNS-over-HTTPS request")
return nil
}
defer resp.Body.Close()
// Read and unmarshal the response body
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.Error(fmt.Errorf("error reading response: %w", err))
return nil
}
var data struct {
Answer []struct {
Data string `json:"data"`
} `json:"Answer"`
}
if err := json.Unmarshal(body, &data); err != nil {
log.Error(fmt.Errorf("error unmarshaling response: %w", err))
return nil
}
// Extract the IPv6 addresses
for _, answer := range data.Answer {
values = append(values, answer.Data)
}
return values
}
func digAAAA(hostname string) []string {
var blah, ipv6Addresses []string
// domain := hostname
recordType := dns.TypeAAAA // dns.TypeTXT
// Cloudflare's DNS server
blah, _ = dnsUdpLookup("1.1.1.1:53", hostname, recordType)
log.Println("digAAAA() has BLAH =", blah)
if (len(blah) == 0) {
log.Println("digAAAA() RUNNING dnsAAAAlookupDoH(domain)")
ipv6Addresses = lookupDoH(hostname, "AAAA")
log.Println("digAAAA() has ipv6Addresses =", strings.Join(ipv6Addresses, " "))
for _, addr := range ipv6Addresses {
log.Println(addr)
}
return ipv6Addresses
}
// TODO: check digDoH vs blah, if so, then port 53 TCP and/or UDP is broken or blocked
log.Println("digAAAA() has BLAH =", blah)
return blah
}
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