(Android™) Cloudfare DNS over HTTPS

Cloudflare offers a DNS over HTTPS resolver at: https://cloudflare-dns.com/dns-query

This example demonstrates how to do a DNS lookup for a domain using Cloudfare's HTTPS resolver.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // Send the following CURL request:   curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A'

    http.put_Accept("application/dns-json");

    String url = "https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A";

    String jsonResp = http.quickGetStr(url);
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    Log.i(TAG, "Response Status Code: " + String.valueOf(http.get_LastStatus()));

    CkJsonObject json = new CkJsonObject();
    json.Load(jsonResp);
    json.put_EmitCompact(false);
    Log.i(TAG, json.emit());

    if (http.get_LastStatus() != 200) {
        Log.i(TAG, "Failed.");
        return;
        }

    // Sample output...
    // (See the parsing code below..)
    // 

    // {
    //   "Status": 0,
    //   "TC": false,
    //   "RD": true,
    //   "RA": true,
    //   "AD": false,
    //   "CD": false,
    //   "Question": [
    //     {
    //       "name": "chilkat.io.",
    //       "type": 1
    //     }
    //   ],
    //   "Answer": [
    //     {
    //       "name": "chilkat.io.",
    //       "type": 1,
    //       "TTL": 900,
    //       "data": "52.25.83.238"
    //     }
    //   ]
    // }

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    int Status;
    boolean TC;
    boolean RD;
    boolean RA;
    boolean AD;
    boolean CD;
    int i;
    int count_i;
    String name;
    int type;
    int TTL;
    String data;
    String ipAddr;

    Status = json.IntOf("Status");
    TC = json.BoolOf("TC");
    RD = json.BoolOf("RD");
    RA = json.BoolOf("RA");
    AD = json.BoolOf("AD");
    CD = json.BoolOf("CD");
    i = 0;
    count_i = json.SizeOfArray("Question");
    while (i < count_i) {
        json.put_I(i);
        name = json.stringOf("Question[i].name");
        type = json.IntOf("Question[i].type");
        i = i + 1;
        }

    i = 0;
    count_i = json.SizeOfArray("Answer");
    // The domain name resolves to 1 or more IP addresses..
    while (i < count_i) {
        json.put_I(i);
        name = json.stringOf("Answer[i].name");
        type = json.IntOf("Answer[i].type");
        TTL = json.IntOf("Answer[i].TTL");
        ipAddr = json.stringOf("Answer[i].data");

        Log.i(TAG, "IP Address: " + ipAddr);
        i = i + 1;
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}