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(Unicode C++) Cloudfare DNS over HTTPSCloudflare 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.
#include <CkHttpW.h> #include <CkJsonObjectW.h> void ChilkatSample(void) { // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. CkHttpW http; // 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(L"application/dns-json"); const wchar_t *url = L"https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A"; const wchar_t *jsonResp = http.quickGetStr(url); if (http.get_LastMethodSuccess() != true) { wprintf(L"%s\n",http.lastErrorText()); return; } wprintf(L"Response Status Code: %d\n",http.get_LastStatus()); CkJsonObjectW json; json.Load(jsonResp); json.put_EmitCompact(false); wprintf(L"%s\n",json.emit()); if (http.get_LastStatus() != 200) { wprintf(L"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 int Status; bool TC; bool RD; bool RA; bool AD; bool CD; int i; int count_i; const wchar_t *name = 0; int type; int TTL; const wchar_t *data = 0; const wchar_t *ipAddr = 0; Status = json.IntOf(L"Status"); TC = json.BoolOf(L"TC"); RD = json.BoolOf(L"RD"); RA = json.BoolOf(L"RA"); AD = json.BoolOf(L"AD"); CD = json.BoolOf(L"CD"); i = 0; count_i = json.SizeOfArray(L"Question"); while (i < count_i) { json.put_I(i); name = json.stringOf(L"Question[i].name"); type = json.IntOf(L"Question[i].type"); i = i + 1; } i = 0; count_i = json.SizeOfArray(L"Answer"); // The domain name resolves to 1 or more IP addresses.. while (i < count_i) { json.put_I(i); name = json.stringOf(L"Answer[i].name"); type = json.IntOf(L"Answer[i].type"); TTL = json.IntOf(L"Answer[i].TTL"); ipAddr = json.stringOf(L"Answer[i].data"); wprintf(L"IP Address: %s\n",ipAddr); i = i + 1; } } |
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