Change #266356

Comments

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

Changed files

• docs/Makefile.am
• docs/internals/PEERS.md
• lib/Makefile.inc
• lib/cf-dns.c
• lib/cf-dns.h
• lib/cf-h1-proxy.c
• lib/cf-h1-proxy.h
• lib/cf-h2-proxy.c
• lib/cf-h2-proxy.h
• lib/cf-haproxy.c
• lib/cf-ip-happy.c
• lib/cf-socket.c
• lib/cfilters.c
• lib/cfilters.h
• lib/connect.c
• lib/connect.h
• lib/curl_addrinfo.c
• lib/curl_addrinfo.h
• lib/curl_sasl.c
• lib/ftp.c
• lib/hostip.c
• lib/hostip.h
• lib/hsts.c
• lib/hsts.h
• lib/http.c
• lib/http2.c
• lib/http_aws_sigv4.c
• lib/http_negotiate.c
• lib/http_ntlm.c
• lib/http_proxy.c
• lib/http_proxy.h
• lib/httpsrr.c
• lib/idn.c
• lib/idn.h
• lib/ldap.c
• lib/openldap.c
• lib/peer.c
• lib/peer.h
• lib/protocol.c
• lib/protocol.h
• lib/rtsp.c
• lib/smb.c
• lib/socks.c
• lib/socks.h
• lib/socks_gssapi.c
• lib/socks_sspi.c
• lib/url.c
• lib/url.h
• lib/urldata.h
• lib/vauth/digest.c
• lib/vauth/digest_sspi.c
• lib/vauth/vauth.c
• lib/vquic/vquic-tls.c
• lib/vssh/libssh.c
• lib/vssh/libssh2.c
• lib/vtls/apple.c
• lib/vtls/gtls.c
• lib/vtls/mbedtls.c
• lib/vtls/openssl.c
• lib/vtls/rustls.c
• lib/vtls/schannel.c
• lib/vtls/schannel_verify.c
• lib/vtls/vtls.c
• lib/vtls/vtls.h
• lib/vtls/vtls_scache.c
• lib/vtls/wolfssl.c
• scripts/schemetable.c