Modifying the answer from dns.query.udp

[GamePlayer-8]

Good afternoon,

How to modify the answer received from dns.query.udp() function?

For example:

import dns.message
import dns.query

query = dns.message.make_query("cloudflare.com", dns.rdatatype.A)
response = dns.query.udp(query, "8.8.8.8")

for answer in response.answer:
    if answer.rdtype == dns.rdatatype.A:
        for rdata in answer:
            if str(rdata) == "127.0.0.1":
                print(rdata)

except instead of reading the IP, I want to replace it in the response variable.

[rthalley]

This response is slightly more general than your question, in that it shows you how to change a field of an rdata and replace it in the response. In your case, replacing an rdata field and replacing the whole rdata are the same as A records only have one field, but this technique would work if you (say) wanted to change the priority of an MX record without changing its target.

for answer in response.answer:
    if answer.rdtype == dns.rdatatype.A:
        new_rdatas = dns.rdataset.Rdataset(answer.rdclass, answer.rdtype)
        for rdata in answer:
            if rdata.address == "127.0.0.1":
                new_rdata = rdata.replace(address="127.0.0.2")
                new_rdatas.add(new_rdata, answer.ttl)
            else:
                new_rdatas.add(rdata, answer.ttl)
        answer.clear()
        answer.update(new_rdatas)
print(response)

[GamePlayer-8]

I wasn't aware of dns.rdataset.Rdataset function. Thank you! ❤️