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15 lines
566 B
15 lines
566 B
2 years ago
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diff --git a/dns/query.py b/dns/query.py
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index bfecd43..19b9fbb 100644
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--- a/dns/query.py
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+++ b/dns/query.py
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@@ -467,7 +467,8 @@ def xfr(where, zone, rdtype=dns.rdatatype.AXFR, rdclass=dns.rdataclass.IN,
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first = True
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while not done:
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mexpiration = _compute_expiration(timeout)
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- if mexpiration is None or mexpiration > expiration:
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+ if mexpiration is None or \
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+ (expiration is not None and mexpiration > expiration):
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mexpiration = expiration
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if use_udp:
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_wait_for_readable(s, expiration)
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