dns-txt
Encode or decode the RDATA field in multicast DNS TXT records. For use with DNS-Based Service Discovery. For details see RFC 6763.
Installation
Usage
API
The encoder and decoder conforms to RFC 6763.
Initialize
The module exposes a constructor function which can be called with an optional options object:
The options are:
binary
- If set totrue
all values will be returned asBuffer
objects. The default behavior is to turn all values into strings. But according to the RFC the values can be any binary data. If you expect binary data, use this option.
txt.encode(obj, [buffer], [offset])
txt.encode(obj, [buffer], [offset])
Takes a key/value object and returns a buffer with the encoded TXT record. If a buffer is passed as the second argument the object should be encoded into that buffer. Otherwise a new buffer should be allocated If an offset is passed as the third argument the object should be encoded at that byte offset. The byte offset defaults to 0
.
This module does not actively validate the key/value pairs, but keep the following in rules in mind:
To be RFC compliant, each key should conform with the rules as specified in section 6.4.
To be RFC compliant, each value should conform with the rules as specified in section 6.5.
After encoding txt.encode.bytes
is set to the amount of bytes used to encode the object.
txt.decode(buffer, [offset], [length])
txt.decode(buffer, [offset], [length])
Takes a buffer and returns a decoded key/value object. If an offset is passed as the second argument the object should be decoded from that byte offset. The byte offset defaults to 0
. Note that all keys will be lowercased and all values will be Buffer objects.
After decoding txt.decode.bytes
is set to the amount of bytes used to decode the object.
txt.encodingLength(obj)
txt.encodingLength(obj)
Takes a single key/value object and returns the number of bytes that the given object would require if encoded.
License
MIT
Last updated