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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 <C_CkHttpW.h> #include <C_CkJsonObjectW.h> void ChilkatSample(void) { HCkHttpW http; const wchar_t *url; const wchar_t *jsonResp; HCkJsonObjectW json; int Status; BOOL TC; BOOL RD; BOOL RA; BOOL AD; BOOL CD; int i; int count_i; const wchar_t *name; int type; int TTL; const wchar_t *data; const wchar_t *ipAddr; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http = CkHttpW_Create(); // Send the following CURL request: curl -H 'accept: application/dns-json' 'https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A' CkHttpW_putAccept(http,L"application/dns-json"); url = L"https://cloudflare-dns.com/dns-query?name=chilkat.io&type=A"; jsonResp = CkHttpW_quickGetStr(http,url); if (CkHttpW_getLastMethodSuccess(http) != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); return; } wprintf(L"Response Status Code: %d\n",CkHttpW_getLastStatus(http)); json = CkJsonObjectW_Create(); CkJsonObjectW_Load(json,jsonResp); CkJsonObjectW_putEmitCompact(json,FALSE); wprintf(L"%s\n",CkJsonObjectW_emit(json)); if (CkHttpW_getLastStatus(http) != 200) { wprintf(L"Failed.\n"); CkHttpW_Dispose(http); CkJsonObjectW_Dispose(json); 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 Status = CkJsonObjectW_IntOf(json,L"Status"); TC = CkJsonObjectW_BoolOf(json,L"TC"); RD = CkJsonObjectW_BoolOf(json,L"RD"); RA = CkJsonObjectW_BoolOf(json,L"RA"); AD = CkJsonObjectW_BoolOf(json,L"AD"); CD = CkJsonObjectW_BoolOf(json,L"CD"); i = 0; count_i = CkJsonObjectW_SizeOfArray(json,L"Question"); while (i < count_i) { CkJsonObjectW_putI(json,i); name = CkJsonObjectW_stringOf(json,L"Question[i].name"); type = CkJsonObjectW_IntOf(json,L"Question[i].type"); i = i + 1; } i = 0; count_i = CkJsonObjectW_SizeOfArray(json,L"Answer"); // The domain name resolves to 1 or more IP addresses.. while (i < count_i) { CkJsonObjectW_putI(json,i); name = CkJsonObjectW_stringOf(json,L"Answer[i].name"); type = CkJsonObjectW_IntOf(json,L"Answer[i].type"); TTL = CkJsonObjectW_IntOf(json,L"Answer[i].TTL"); ipAddr = CkJsonObjectW_stringOf(json,L"Answer[i].data"); wprintf(L"IP Address: %s\n",ipAddr); i = i + 1; } CkHttpW_Dispose(http); CkJsonObjectW_Dispose(json); } |
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