Zig

Cloudfare DNS over HTTPS

See more Cloudfare Examples

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.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const http = try chilkat.Http.init();
    defer http.deinit();

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

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

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

    const json_resp = http.quickGetStr(alloc, url) catch {
        std.debug.print("{s}\n", .{try http.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Response Status Code: {d}\n", .{http.getLastStatus()});

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.load(json_resp) catch {};
    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    if (http.getLastStatus() != 200) {
        std.debug.print("Failed.\n", .{});
        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

    var i: i32 = 0;
    var count_i: i32 = 0;
    var name: [:0]const u8 = "";
    var type_: i32 = 0;
    var ttl: i32 = 0;
    var ip_addr: [:0]const u8 = "";

    _ = json.intOf("Status");
    _ = json.boolOf("TC");
    _ = json.boolOf("RD");
    _ = json.boolOf("RA");
    _ = json.boolOf("AD");
    _ = json.boolOf("CD");
    i = 0;
    count_i = json.sizeOfArray("Question");
    while (i < count_i) {
        json.setI(i);
        name = try json.stringOf(alloc, "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.setI(i);
        name = try json.stringOf(alloc, "Answer[i].name");
        type_ = json.intOf("Answer[i].type");
        ttl = json.intOf("Answer[i].TTL");
        ip_addr = try json.stringOf(alloc, "Answer[i].data");

        std.debug.print("IP Address: {s}\n", .{ip_addr});
        i = i + 1;
    }
}