connections: introduce http/3 happy eyeballs

New cfilter HTTP-CONNECT for h3/h2/http1.1 eyeballing.
- filter is installed when `--http3` in the tool is used (or
  the equivalent CURLOPT_ done in the library)
- starts a QUIC/HTTP/3 connect right away. Should that not
  succeed after 100ms (subject to change), a parallel attempt
  is started for HTTP/2 and HTTP/1.1 via TCP
- both attempts are subject to IPv6/IPv4 eyeballing, same
  as happens for other connections
- tie timeout to the ip-version HAPPY_EYEBALLS_TIMEOUT
- use a `soft` timeout at half the value. When the soft timeout
  expires, the HTTPS-CONNECT filter checks if the QUIC filter
  has received any data from the server. If not, it will start
  the HTTP/2 attempt.

HTTP/3(ngtcp2) improvements.
- setting call_data in all cfilter calls similar to http/2 and vtls filters
  for use in callback where no stream data is available.
- returning CURLE_PARTIAL_FILE for prematurely terminated transfers
- enabling pytest test_05 for h3
- shifting functionality to "connect" UDP sockets from ngtcp2
  implementation into the udp socket cfilter. Because unconnected
  UDP sockets are weird. For example they error when adding to a
  pollset.

HTTP/3(quiche) improvements.
- fixed upload bug in quiche implementation, now passes 251 and pytest
- error codes on stream RESET
- improved debug logs
- handling of DRAIN during connect
- limiting pending event queue

HTTP/2 cfilter improvements.
- use LOG_CF macros for dynamic logging in debug build
- fix CURLcode on RST streams to be CURLE_PARTIAL_FILE
- enable pytest test_05 for h2
- fix upload pytests and improve parallel transfer performance.

GOAWAY handling for ngtcp2/quiche
- during connect, when the remote server refuses to accept new connections
  and closes immediately (so the local conn goes into DRAIN phase), the
  connection is torn down and a another attempt is made after a short grace
  period.
  This is the behaviour observed with nghttpx when we tell it to  shut
  down gracefully. Tested in pytest test_03_02.

TLS improvements
- ALPN selection for SSL/SSL-PROXY filters in one vtls set of functions, replaces
  copy of logic in all tls backends.
- standardized the infof logging of offered ALPNs
- ALPN negotiated: have common function for all backends that sets alpn proprty
  and connection related things based on the negotiated protocol (or lack thereof).

- new tests/tests-httpd/scorecard.py for testing h3/h2 protocol implementation.
  Invoke:
    python3 tests/tests-httpd/scorecard.py --help
  for usage.

Improvements on gathering connect statistics and socket access.
- new CF_CTRL_CONN_REPORT_STATS cfilter control for having cfilters
  report connection statistics. This is triggered when the connection
  has completely connected.
- new void Curl_pgrsTimeWas(..) method to report a timer update with
  a timestamp of when it happend. This allows for updating timers
  "later", e.g. a connect statistic after full connectivity has been
  reached.
- in case of HTTP eyeballing, the previous changes will update
  statistics only from the filter chain that "won" the eyeballing.
- new cfilter query CF_QUERY_SOCKET for retrieving the socket used
  by a filter chain.
  Added methods Curl_conn_cf_get_socket() and Curl_conn_get_socket()
  for convenient use of this query.
- Change VTLS backend to query their sub-filters for the socket when
  checks during the handshake are made.

HTTP/3 documentation on how https eyeballing works.

TLS improvements
- ALPN selection for SSL/SSL-PROXY filters in one vtls set of functions, replaces
  copy of logic in all tls backends.
- standardized the infof logging of offered ALPNs
- ALPN negotiated: have common function for all backends that sets alpn proprty
  and connection related things based on the negotiated protocol (or lack thereof).

Scorecard with Caddy.
- configure can be run with `--with-test-caddy=path` to specify which caddy to use for testing
- tests/tests-httpd/scorecard.py now measures download speeds with caddy

pytest improvements
- adding Makfile to clean gen dir
- adding nghttpx rundir creation on start
- checking httpd version 2.4.55 for test_05 cases where it is needed. Skipping with message if too old.
- catch exception when checking for caddy existance on system.

Closes #10349

1 files changed, 19 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 1a4e21c26..a58e266cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -311,6 +311,16 @@ AS_HELP_STRING([--with-test-nghttpx=PATH],[where to find nghttpx for testing]),
 )
 AC_SUBST(TEST_NGHTTPX)
 
+CADDY=caddy
+AC_ARG_WITH(test-caddy,dnl
+AS_HELP_STRING([--with-test-caddy=PATH],[where to find caddy for testing]),
+  CADDY=$withval
+  if test X"$OPT_CADDY" = "Xno" ; then
+      CADDY=""
+  fi
+)
+AC_SUBST(CADDY)
+
 dnl we'd like a httpd+apachectl as test server
 dnl
 AC_ARG_WITH(test-httpd, [AS_HELP_STRING([--with-test-httpd=PATH],
@@ -366,6 +376,14 @@ fi
     AC_PATH_PROG([APXS], [apxs])
 AC_SUBST(HTTPD_NGHTTPX)
 
+dnl the Caddy server we might use in testing
+if test "x$TEST_CADDY" != "x"; then
+  CADDY="$TEST_CADDY"
+else
+  AC_PATH_PROG([CADDY], [caddy])
+fi
+AC_SUBST(CADDY)
+
 dnl If no TLS choice has been made, check if it was explicitly disabled or
 dnl error out to force the user to decide.
 if test -z "$TLSCHOICE"; then
@@ -4646,6 +4664,7 @@ AC_CONFIG_FILES([Makefile \
            tests/libtest/Makefile \
            tests/unit/Makefile \
            tests/tests-httpd/config.ini \
+           tests/tests-httpd/Makefile \
            packages/Makefile \
            packages/vms/Makefile \
            curl-config \