Javascript DNS

DNS resolver global object.

Methods

• query(type,name,async)

Make a DNS query

Parameters:
type Type of DNS Record to query
name Domain Name to query
async Optional non-blocking flag
Return:
Array of records of uniform type.

• For A, AAAA, TXT records are strings
• For NAPTR records are objects with fields:
  • flags
  • service
  • regexp
  • replacement
  • name
  • order
  • priority
  • ttl
• For SRV records are objects with fields:
  • port
  • name
  • order
  • priority
  • ttl

If async is boolean true the execution context is unlocked during the DNS operation.

• queryA(name,async)

Shortcut for query("A",name,async)

• queryAaaa(name,async)

Shortcut for query("AAAA",name,async)

• queryTxt(name,async)

Shortcut for query("TXT",name,async)

• queryNaptr(name,async)

Shortcut for query("NAPTR",name,async)

• querySrv(name,async)

Shortcut for query("SRV",name,async)

• resolve(name)

Resolves the name using the system routines. This returns at most one address and takes into account the hosts file.

• local(address)

Returns the local IP address that is used by default as route to remote address. Remote address can be specified by DNS name in which case it is resolved first.

• pack(address,separator)

Returns a hexadecimal string representing the packed representation of the IP address. Address can be specified by DNS name in which case it is resolved first.
Returns undefined on error.

Parameters:
address IP address to pack
separator Optional hexadecimal octets separator

• unpack(hexstr)

Returns the canonical text form of the packed IP adress provided.

Parameters:
hexstr Hexadecimal representation of the packed IP address, must be 4, 8 or 16 octets long. An 8 octets address is interpreted as a /64 IPv6 prefix.
Returns undefined on error.