76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
package util
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"github.com/c-robinson/iplib"
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"github.com/miekg/dns"
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)
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func ReverseDNS(dom string, q string) (string, error) {
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if q == "PTR" {
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if strings.Contains(dom, ".") {
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// It's an IPv4 address
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ip := net.ParseIP(dom)
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if ip != nil {
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return iplib.IP4ToARPA(ip), nil
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} else {
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return "", errors.New("error: Could not parse IPv4 address")
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}
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} else if strings.Contains(dom, ":") {
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// It's an IPv6 address
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ip := net.ParseIP(dom)
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if ip != nil {
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return iplib.IP6ToARPA(ip), nil
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} else {
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return "", errors.New("error: Could not parse IPv6 address")
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}
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}
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}
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return "", errors.New("error: -x flag given but no IP found")
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}
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func ResolveHTTPS(msg *dns.Msg, server string) (*dns.Msg, error) {
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httpR := &http.Client{}
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buf, err := msg.Pack()
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if err != nil {
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return nil, err
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}
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query := server + "?dns=" + base64.RawURLEncoding.EncodeToString(buf)
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req, err := http.NewRequest("GET", query, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set("Accept", "application/dns-message")
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res, err := httpR.Do(req)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("bad HTTP Request: %d", res.StatusCode)
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}
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fullRes, err := io.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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response := dns.Msg{}
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err = response.Unpack(fullRes)
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if err != nil {
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return nil, err
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}
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return &response, nil
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}
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