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cf-dns: connection filter for DNS queries

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New connection filter `cf-dns` that manages DNS queries. If hands
out addresses and HTTPS-RR records to anyone interested. Used by
HTTPS and IP happy eyeballing.

Information may become available *before* the libcurl "dns entry"
is complete, e.g. all queries have been answered. The cf-ip-happy
filter uses this information to start connection attempts as soon
as the first address is available.

The multi MSTATE_RESOLVING was removed. A new connection always
goes to MSTATE_CONNECTING. The connectdata bit `dns_resolved`
indicates when DNS information is complete. This is used for
error reporting and starting the progress meter.

Removed dns entries `data->state.dns[i]`, as the `cf-dns` filter
now keeps the reference now.

Many minor tweaks for making this work and pass address information
around safely.

Closes #21027
This commit is contained in:
Stefan Eissing 2026-03-25 15:07:10 +01:00 • committed by Daniel Stenberg
parent 89741958e8
commit 335dc0e3c5
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GPG key ID: 5CC908FDB71E12C2
44 changed files with 1785 additions and 1017 deletions
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lib/cfilters.h
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@ -346,6 +346,7 @@ unsigned char Curl_conn_cf_get_transport(struct Curl_cfilter *cf,
struct Curl_easy *data);
int Curl_socktype_for_transport(uint8_t transport);
int Curl_protocol_for_transport(uint8_t transport);
const char *Curl_conn_cf_get_alpn_negotiated(struct Curl_cfilter *cf,
struct Curl_easy *data);