payload

grammar.py

"""
byte, short and other C types are serialized in network/big endian
"""
grammarSource = r"""
byte = anything:b -> ord(b)
short = byte:high byte:low -> high << 8 | low
int = short:high short:low -> high << 16 | low

header = short:id byte:byte3 byte:byte4 !(DNSParser.updateHeader(id, byte3, byte4))
        short:nqueries short:nans short:nns short:nadd -> nqueries, nans, nns, nadd


query = name:n short:type short:cls !(DNSParser.updateQuery(n, type, cls))

name = !(DNSParser.preName()) label* (byte:b ?(b == 0) -> DNSParser.tempName
        | pointer !(DNSParser.postName()) -> DNSParser.tempName)

label = byte:l ?(0 < l < 64) <byte{l}>:la !(DNSParser.updateName(la))
pointer = byte:ptrH ?(ptrH >> 6 == 3) byte:ptrL !(DNSParser.updateNameOffset(ptrH, ptrL))

rrheader = name:n short:type short:cls int:ttl short:rdlength
            (->DNSParser.msg.lookupRecordType(type)):t ?(t) payload
# payload = byte{}

start = header:h (->h[0]):nqueries query{nqueries} (->h[1]):nans rrheader{nans}
        (->h[2]):nns rrheader{nns} (->h[3])nadd rrheader{nadd}



digit = :x ?(x in '0123456789') -> x
        | :y -> dict()
"""

In line #24, the payload of parsing depends on the type of t. I think I should add an expression like !(DNSParser.parser.doparseGrammar(t.type)) but I don't know the correct syntax.

The logic is corresponding to header.payload.decode inside Message.parseRecords