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resolving: dns error tracing

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* Add more tracing information to c-ares errors.
* remove CURL_ASYNC_SUCCESS, rename `ares->last_status` to
  `ares->ares_status`. Give trace explanation for "common"
  errors
* add ares "csv" information to tracing on failure
* DoH: invoke `Curl_resolver_error()` on failure to populate
  error buf

Closes #18247
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Stefan Eissing 2025-08-11 11:39:03 +02:00 • committed by Daniel Stenberg
parent 89490b16c7
commit 9cc4e24ad9
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6 changed files with 59 additions and 30 deletions
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4
lib/doh.c
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@ -1249,8 +1249,8 @@ CURLcode Curl_doh_is_resolved(struct Curl_easy *data,
p->dnstype, &de);
#ifndef CURL_DISABLE_VERBOSE_STRINGS
if(rc[slot]) {
infof(data, "DoH: %s type %s for %s", doh_strerror(rc[slot]),
doh_type2name(p->dnstype), dohp->host);
CURL_TRC_DNS(data, "DoH: %s type %s for %s", doh_strerror(rc[slot]),
doh_type2name(p->dnstype), dohp->host);
}
#endif
} /* next slot */