| 779 | return (self.nameserver, self.tcp_attempt, backoff) |
| 780 | |
| 781 | def query_result( |
| 782 | self, response: dns.message.Message | None, ex: Exception | None |
| 783 | ) -> Tuple[Answer | None, bool]: |
| 784 | # |
| 785 | # returns an (answer: Answer, end_loop: bool) tuple. |
| 786 | # |
| 787 | assert self.nameserver is not None |
| 788 | if ex: |
| 789 | # Exception during I/O or from_wire() |
| 790 | assert response is None |
| 791 | self.errors.append( |
| 792 | ( |
| 793 | str(self.nameserver), |
| 794 | self.tcp_attempt, |
| 795 | self.nameserver.answer_port(), |
| 796 | ex, |
| 797 | response, |
| 798 | ) |
| 799 | ) |
| 800 | if ( |
| 801 | isinstance(ex, dns.exception.FormError) |
| 802 | or isinstance(ex, EOFError) |
| 803 | or isinstance(ex, OSError) |
| 804 | or isinstance(ex, NotImplementedError) |
| 805 | ): |
| 806 | # This nameserver is no good, take it out of the mix. |
| 807 | self.nameservers.remove(self.nameserver) |
| 808 | elif isinstance(ex, dns.message.Truncated): |
| 809 | if self.tcp_attempt: |
| 810 | # Truncation with TCP is no good! |
| 811 | self.nameservers.remove(self.nameserver) |
| 812 | else: |
| 813 | self.retry_with_tcp = True |
| 814 | return (None, False) |
| 815 | # We got an answer! |
| 816 | assert response is not None |
| 817 | assert isinstance(response, dns.message.QueryMessage) |
| 818 | rcode = response.rcode() |
| 819 | if rcode == dns.rcode.NOERROR: |
| 820 | try: |
| 821 | answer = Answer( |
| 822 | self.qname, |
| 823 | self.rdtype, |
| 824 | self.rdclass, |
| 825 | response, |
| 826 | self.nameserver.answer_nameserver(), |
| 827 | self.nameserver.answer_port(), |
| 828 | ) |
| 829 | except Exception as e: |
| 830 | self.errors.append( |
| 831 | ( |
| 832 | str(self.nameserver), |
| 833 | self.tcp_attempt, |
| 834 | self.nameserver.answer_port(), |
| 835 | e, |
| 836 | response, |
| 837 | ) |
| 838 | ) |