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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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5
tests/libtest/lib655.c
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@ -74,7 +74,7 @@ static CURLcode test_lib655(const char *URL)
goto test_cleanup;
}
/* First set the URL that is about to receive our request. */
/* Set the URL that is about to receive our first request. */
test_setopt(curl, CURLOPT_URL, URL);
test_setopt(curl, CURLOPT_RESOLVER_START_DATA, TEST_DATA_STRING);
@ -91,6 +91,9 @@ static CURLcode test_lib655(const char *URL)
goto test_cleanup;
}
/* Set the URL that receives our second request. */
test_setopt(curl, CURLOPT_URL, libtest_arg2);
test_setopt(curl, CURLOPT_RESOLVER_START_FUNCTION, resolver_alloc_cb_pass);
/* this should succeed */