feat : add http dns resolver with cloudflare

Makefile

@@ -5,6 +5,9 @@ bin_path=./bin
 wireformat:
 	go build -o $(bin_path)/wireformat cmd/wireformat/wireformat.go
 
+http-resolver:
+	go build -o $(bin_path)/http-resolver cmd/dns/http-resolver.go
+
 fmt:
 	go fmt ./...
 

cmd/dns/http-resolver.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+
+	check "antoine-roux.ml/projects/go/dns-tools/internal"
+)
+
+const (
+	DnsResolverUrl = "https://cloudflare-dns.com/dns-query"
+	DnsMethod      = "POST"
+)
+
+func main() {
+
+	// Remove timestamp prefix from log out
+	log.SetFlags(0)
+
+	// Read wireformat from stdin
+	data, err := ioutil.ReadFile(os.Stdin.Name())
+	check.Check(err)
+
+	// Create dns-message post request
+	client := &http.Client{}
+	req, err := http.NewRequest(DnsMethod, DnsResolverUrl, bytes.NewReader(data))
+	req.Header.Add("Content-type", "application/dns-message")
+	check.Check(err)
+
+	// Do post request
+	resp, err := client.Do(req)
+	check.Check(err)
+	defer resp.Body.Close()
+
+	// Read http response and Print wireformat to stdout
+	body, err := ioutil.ReadAll(resp.Body)
+	check.Check(err)
+
+	binary.Write(os.Stdout, binary.LittleEndian, body)
+}

readme.md

@@ -4,7 +4,10 @@ dns relative tools like lookup or wireformat converter
 
 ## build
 
-`make wireformat`
+```
+make wireformat
+make http-resolver 
+```
 
 ## run
 
@@ -21,3 +24,9 @@ Wireformat encode and decode
 `./bin/wireformat -s 'www.example.com' | ./bin/wireformat -f -`
 
 `echo 'www.example.com' | ./bin/wireformat | ./bin/wireformat -f -`
+
+
+Dns query and wireformat encode/decode
+
+`echo 'www.google.com' | ./bin/wireformat -s - | ./bin/http-resolver | ./bin/wireformat -f -`
+