Function parse_response

shadowsocks/asyncdns.py:186–224

(data)

def parse_response(data):
    try:
        if len(data) >= 12:
            header = parse_header(data)
            if not header:
                return None
            res_id, res_qr, res_tc, res_ra, res_rcode, res_qdcount, \
                res_ancount, res_nscount, res_arcount = header

            qds = []
            ans = []
            offset = 12
            for i in range(0, res_qdcount):
                l, r = parse_record(data, offset, True)
                offset += l
                if r:
                    qds.append(r)
            for i in range(0, res_ancount):
                l, r = parse_record(data, offset)
                offset += l
                if r:
                    ans.append(r)
            for i in range(0, res_nscount):
                l, r = parse_record(data, offset)
                offset += l
            for i in range(0, res_arcount):
                l, r = parse_record(data, offset)
                offset += l
            response = DNSResponse()
            if qds:
                response.hostname = qds[0][0]
            for an in qds:
                response.questions.append((an[1], an[2], an[3]))
            for an in ans:
                response.answers.append((an[1], an[2], an[3]))
            return response
    except Exception as e:
        shell.print_exception(e)
        return None


def is_valid_hostname(hostname):