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lib: introduce Curl_peer

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`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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GPG key ID: 5CC908FDB71E12C2
67 changed files with 1902 additions and 1295 deletions
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8
lib/protocol.h
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@ -51,6 +51,7 @@ struct easy_pollset;
#define PORT_SMTPS 465 /* sometimes called SSMTP */
#define PORT_RTSP 554
#define PORT_GOPHER 70
#define PORT_SOCKS 1080
#define PORT_MQTT 1883
#define PORT_MQTTS 8883
@ -62,6 +63,7 @@ struct easy_pollset;
#define CURLPROTO_WS (1L << 30)
#define CURLPROTO_WSS ((curl_prot_t)1 << 31)
#define CURLPROTO_MQTTS (1LL << 32)
#define CURLPROTO_SOCKS (1LL << 33)
#define CURLPROTO_64ALL ((uint64_t)0xffffffffffffffff)
@ -224,6 +226,7 @@ struct Curl_protocol {
SSL connection in the same family
without having PROTOPT_SSL. */
#define PROTOPT_CONN_REUSE (1 << 16) /* this protocol can reuse connections */
#define PROTOPT_NO_TRANSFER (1 << 17) /* this protocol is not for transfers */
/* Everything about a URI scheme. */
struct Curl_scheme {
@ -268,6 +271,11 @@ extern const struct Curl_scheme Curl_scheme_smb;
extern const struct Curl_scheme Curl_scheme_smbs;
extern const struct Curl_scheme Curl_scheme_smtp;
extern const struct Curl_scheme Curl_scheme_smtps;
extern const struct Curl_scheme Curl_scheme_socks;
extern const struct Curl_scheme Curl_scheme_socks4;
extern const struct Curl_scheme Curl_scheme_socks4a;
extern const struct Curl_scheme Curl_scheme_socks5;
extern const struct Curl_scheme Curl_scheme_socks5h;
extern const struct Curl_scheme Curl_scheme_telnet;
extern const struct Curl_scheme Curl_scheme_tftp;
extern const struct Curl_scheme Curl_scheme_ws;