lib: introduce Curl_peer

`struct Curl_peer` keeps information about a communication endpoint
together. It will replace `conn->host` and `conn->conn_to_host` and
proxyinfo host. It will also become part of `struct ssl_peer`.

It has a reference counter, so an instance can be shared between
connections and filters.

Elminiates `conn->host` and `conn->connect_to_host`, used in the
proxyinfo structures. Passed to DNS resolution and socks filters, etc.

Pass peer to http proxy and socks tunnel filters. Use peer in dns filter
and resolving. Make `Curl_peer` a member in the `struct ssl_peer`.

Add `docs/internals/PEERS.md` for documentation.

Closes #21472
This commit is contained in:
Stefan Eissing 2026-05-05 12:58:22 +02:00 committed by Daniel Stenberg
parent 9c9a4f3eab
commit bc40e09f63
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67 changed files with 1902 additions and 1295 deletions

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@ -28,6 +28,7 @@
#include "urldata.h"
#include "cfilters.h"
#include "cf-haproxy.h"
#include "connect.h"
#include "curl_addrinfo.h"
#include "curl_trc.h"
#include "select.h"
@ -78,7 +79,7 @@ static CURLcode cf_haproxy_date_out_set(struct Curl_cfilter *cf,
DEBUGASSERT(ctx);
DEBUGASSERT(ctx->state == HAPROXY_INIT);
#ifdef USE_UNIX_SOCKETS
if(cf->conn->unix_domain_socket)
if(Curl_conn_get_first_peer(cf->conn, cf->sockindex)->unix_socket)
/* the buffer is large enough to hold this! */
result = curlx_dyn_addn(&ctx->data_out, STRCONST("PROXY UNKNOWN\r\n"));
else {