Software: Apache/2.4.41 (Ubuntu). PHP/8.0.30 

uname -a: Linux apirnd 5.4.0-204-generic #224-Ubuntu SMP Thu Dec 5 13:38:28 UTC 2024 x86_64 

uid=33(www-data) gid=33(www-data) groups=33(www-data) 

Safe-mode: OFF (not secure)

/usr/lib/node_modules/npm/node_modules/make-fetch-happen/lib/   drwxr-xr-x
Free 13.22 GB of 57.97 GB (22.8%)
                            Encoder    Tools    Proc.    FTP brute    Sec.    SQL    PHP-code    Update    Self remove    Logout    

Viewing file:     dns.js (1.26 KB)      -rw-r--r--

const LRUCache = require('lru-cache')
const dns = require('dns')

const defaultOptions = exports.defaultOptions = {
  family: undefined,
  hints: dns.ADDRCONFIG,
  all: false,
  verbatim: undefined,
}

const lookupCache = exports.lookupCache = new LRUCache({ max: 50 })

// this is a factory so that each request can have its own opts (i.e. ttl)
// while still sharing the cache across all requests
exports.getLookup = (dnsOptions) => {
  return (hostname, options, callback) => {
    if (typeof options === 'function') {
      callback = options
      options = null
    } else if (typeof options === 'number') {
      options = { family: options }
    }

    options = { ...defaultOptions, ...options }

    const key = JSON.stringify({
      hostname,
      family: options.family,
      hints: options.hints,
      all: options.all,
      verbatim: options.verbatim,
    })

    if (lookupCache.has(key)) {
      const [address, family] = lookupCache.get(key)
      process.nextTick(callback, null, address, family)
      return
    }

    dnsOptions.lookup(hostname, options, (err, address, family) => {
      if (err) {
        return callback(err)
      }

      lookupCache.set(key, [address, family], { ttl: dnsOptions.ttl })
      return callback(null, address, family)
    })
  }
}