started adding dns checking

188a043967f6d821d1bb43203add3b0553b3bbfb

BPplays <andymalbp@gmail.com>

Parents: e75d03fea94d6f690184c58a72bd2d4a3473dcd2
1 files changed, +40 -0Ignore whitespace
server.js+40 -0
@@ -382,6 +382,46 @@ function getSessionCookieAge() {
382382 return undefined;
383383}
384384
385+
386+function canResolve(name, useIPv6 = true, useIPv4 = true) {
387+ return new Promise((resolve, reject) => {
388+ let v6Resolve
389+ let v4Resolve
390+
391+ if (useIPv6) {
392+ dns.resolve6(name, (err) => {
393+ if (err) {
394+ v6Resolve = false
395+ } else {
396+ v6Resolve = true
397+ }
398+ });
399+
400+ } else {
401+ v6Resolve = false
402+ }
403+
404+ if (useIPv4) {
405+ dns.resolve(name, (err) => {
406+ if (err) {
407+ v4Resolve = false
408+ } else {
409+ v4Resolve = true
410+ }
411+ });
412+
413+ } else {
414+ v4Resolve = false
415+ }
416+
417+ if (v6Resolve || v4Resolve) {
418+ resolve
419+ } else {
420+ reject
421+ }
422+ });
423+}
424+
385425async function getHasIP() {
386426 let hasIPv6 = false;
387427 let hasIPv6Local = false;