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dnscache: own source file, improvements

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- Rename `Curl_resolv_unlink()` to `Curl_dns_entry_unlink()`.
- Change `Curl_dnscache_get()` to return CURLcode result. Returns
  now `CURLE_COULDNT_RESOLVE_HOST` for "negative" cache entries.
- Add `Curl_dnscache_add_negative()` to put a "negative" entry
  into the cache.

Closes #20864
This commit is contained in:
Stefan Eissing 2026-03-06 09:22:26 +01:00 • committed by Daniel Stenberg
parent b0f6e9a3d7
commit 96d5b5c688
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GPG key ID: 5CC908FDB71E12C2
35 changed files with 1648 additions and 1413 deletions
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6
lib/cf-socket.c
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@ -641,8 +641,8 @@ static CURLcode bindlocal(struct Curl_easy *data, struct connectdata *conn,
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
int ip_version = (af == AF_INET) ?
CURL_IPRESOLVE_V4 : CURL_IPRESOLVE_WHATEVER;
uint8_t ip_version = (af == AF_INET) ?
CURL_IPRESOLVE_V4 : CURL_IPRESOLVE_WHATEVER;
#ifdef USE_IPV6
if(af == AF_INET6)
ip_version = CURL_IPRESOLVE_V6;
@ -655,7 +655,7 @@ static CURLcode bindlocal(struct Curl_easy *data, struct connectdata *conn,
Curl_printable_address(h->addr, myhost, sizeof(myhost));
infof(data, "Name '%s' family %i resolved to '%s' family %i",
host, af, myhost, h_af);
Curl_resolv_unlink(data, &h); /* this will NULL, potential free h */
Curl_dns_entry_unlink(data, &h); /* this will NULL, potential free h */
if(af != h_af) {
/* bad IP version combo, signal the caller to try another address
family if available */