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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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6
lib/cf-https-connect.h
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@ -31,15 +31,9 @@ struct Curl_cfilter;
struct Curl_easy;
struct connectdata;
struct Curl_cftype;
struct Curl_dns_entry;
extern struct Curl_cftype Curl_cft_http_connect;
CURLcode Curl_cf_http_connect_add(struct Curl_easy *data,
struct connectdata *conn,
int sockindex,
bool try_h3, bool try_h21);
CURLcode Curl_cf_https_setup(struct Curl_easy *data,
struct connectdata *conn,
int sockindex);