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hostip: cache negative name resolves

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Hold them for half the normal lifetime. Helps when told to transfer N
URLs in quick succession that all use the same non-resolving hostname.

Done by storing a DNS entry with a NULL pointer for 'addr'.

Previously an attempt was made in #12406 by Björn Stenberg that was
ultimately never merged.

Closes #18157
This commit is contained in:
Daniel Stenberg 2025-08-04 00:06:03 +02:00
parent 06c12cc08b
commit df2b4ccc22
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11 changed files with 155 additions and 19 deletions
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<testcase>
<info>
<keywords>
DNS cache
</keywords>
</info>
#
# Server-side
<reply>
<dns>
</dns>
</reply>
#
# Client-side
<client>
<server>
dns
</server>
<features>
override-dns
</features>
<name>
Get three URLs with bad host name - cache
</name>
<setenv>
CURL_DNS_SERVER=127.0.0.1:%DNSPORT
</setenv>
<command>
http://examplehost.example/%TESTNUMBER http://examplehost.example/%TESTNUMBER http://examplehost.example/%TESTNUMBER
</command>
</client>
#
# Verify data after the test has been "shot"
<verify>
# curl: (6) Could not resolve host: examplehost.example
<errorcode>
6
</errorcode>
# Ignore HTTPS requests here
<dns host="examplehost.example QTYPE A">
QNAME examplehost.example QTYPE A
QNAME examplehost.example QTYPE AAAA
</dns>
</verify>
</testcase>