lib: connect/h2/h3 refactor

Refactoring of connection setup and happy eyeballing. Move
nghttp2. ngtcp2, quiche and msh3 into connection filters.

 - eyeballing cfilter that uses sub-filters for performing parallel connects
 - socket cfilter for all transport types, including QUIC
 - QUIC implementations in cfilter, can now participate in eyeballing
 - connection setup is more dynamic in order to adapt to what filter did
   really connect.  Relevant to see if a SSL filter needs to be added or
   if SSL has already been provided
 - HTTP/3 test cases similar to HTTP/2
 - multiuse of parallel transfers for HTTP/3, tested for ngtcp2 and quiche

 - Fix for data attach/detach in VTLS filters that could lead to crashes
   during parallel transfers.
 - Eliminating setup() methods in cfilters, no longer needed.
 - Improving Curl_conn_is_alive() to replace Curl_connalive() and
   integrated ssl alive checks into cfilter.
 - Adding CF_CNTRL_CONN_INFO_UPDATE to tell filters to update
   connection into and persist it at the easy handle.

 - Several more cfilter related cleanups and moves:
   - stream_weigth and dependency info is now wrapped in struct
     Curl_data_priority
   - Curl_data_priority members depend is available in HTTP2|HTTP3
   - Curl_data_priority members depend on NGHTTP2 support
   - handling init/reset/cleanup of priority part of url.c
   - data->state.priority same struct, but shallow copy for compares only

 - PROTOPT_STREAM has been removed
   - Curl_conn_is_mulitplex() now available to check on capability

 - Adding query method to connection filters.
   - ngtcp2+quiche: implementing query for max concurrent transfers.

 - Adding is_alive and keep_alive cfilter methods. Adding DATA_SETUP event.
   - setting keepalive timestamp on connect
   - DATA_SETUP is called after the connection has been completely
     setup (but may not connected yet) to allow filters to initialize
     data members they use.

 - there is no socket to be had with msh3, it is unclear how select
   shall work

 - manual test via "curl --http3 https://curl.se" fail with "empty
   reply from server".

 - Various socket/conn related cleanups:
   - Curl_socket is now Curl_socket_open and in cf-socket.c
   - Curl_closesocket is now Curl_socket_close and in cf-socket.c
   - Curl_ssl_use has been replaced with Cur_conn_is_ssl
   - Curl_conn_tcp_accepted_set has been split into
     Curl_conn_tcp_listen_set and Curl_conn_tcp_accepted_set
     with a clearer purpose

Closes #10141

2 files changed, 146 insertions, 0 deletions

diff --git a/tests/libtest/Makefile.inc b/tests/libtest/Makefile.inc
index 022ad3663..13f94ab63 100644
--- a/tests/libtest/Makefile.inc
+++ b/tests/libtest/Makefile.inc
@@ -71,6 +71,7 @@ noinst_PROGRAMS = chkhostname libauthretry libntlmconnect                \
  lib1945 lib1946 lib1947 lib1948 lib1955 lib1956 lib1957 lib1958 lib1959 \
  lib2301 lib2302 lib2304 \
  lib2402 \
+ lib2502 \
  lib3010 lib3025 lib3026 lib3027 \
  lib3100 lib3101
 
@@ -803,6 +804,10 @@ lib2402_SOURCES = lib2402.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib2402_LDADD = $(TESTUTIL_LIBS)
 lib2402_CPPFLAGS = $(AM_CPPFLAGS) -DLIB2402
 
+lib2502_SOURCES = lib2502.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
+lib2502_LDADD = $(TESTUTIL_LIBS)
+lib2502_CPPFLAGS = $(AM_CPPFLAGS) -DLIB2502
+
 lib3010_SOURCES = lib3010.c $(SUPPORTFILES) $(TESTUTIL) $(WARNLESS)
 lib3010_LDADD = $(TESTUTIL_LIBS)
 lib3010_CPPFLAGS = $(AM_CPPFLAGS)
diff --git a/tests/libtest/lib2502.c b/tests/libtest/lib2502.c
new file mode 100644
index 000000000..426b46b94
--- /dev/null
+++ b/tests/libtest/lib2502.c
@@ -0,0 +1,141 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2013 - 2022, Linus Nielsen Feltzing <linus@haxx.se>
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "test.h"
+
+#include "testutil.h"
+#include "warnless.h"
+#include "memdebug.h"
+
+#define TEST_HANG_TIMEOUT 60 * 1000
+
+#define NUM_HANDLES 4
+
+int test(char *URL)
+{
+  int res = 0;
+  CURL *curl[NUM_HANDLES] = {0};
+  int running;
+  CURLM *m = NULL;
+  int i;
+  char target_url[256];
+  char dnsentry[256];
+  struct curl_slist *slist = NULL;
+  char *port = libtest_arg3;
+  char *address = libtest_arg2;
+
+  (void)URL;
+
+  msnprintf(dnsentry, sizeof(dnsentry), "localhost:%s:%s",
+            port, address);
+  printf("%s\n", dnsentry);
+  slist = curl_slist_append(slist, dnsentry);
+  if(!slist) {
+    fprintf(stderr, "curl_slist_append() failed\n");
+    goto test_cleanup;
+  }
+
+  start_test_timing();
+
+  global_init(CURL_GLOBAL_ALL);
+
+  multi_init(m);
+
+  multi_setopt(m, CURLMOPT_MAXCONNECTS, 1L);
+
+  /* get NUM_HANDLES easy handles */
+  for(i = 0; i < NUM_HANDLES; i++) {
+    /* get an easy handle */
+    easy_init(curl[i]);
+    /* specify target */
+    msnprintf(target_url, sizeof(target_url),
+              "https://localhost:%s/path/2502%04i",
+              port, i + 1);
+    target_url[sizeof(target_url) - 1] = '\0';
+    easy_setopt(curl[i], CURLOPT_URL, target_url);
+    /* go http2 */
+    easy_setopt(curl[i], CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_3);
+    easy_setopt(curl[i], CURLOPT_CONNECTTIMEOUT_MS, (long)5000);
+    easy_setopt(curl[i], CURLOPT_CAINFO, "./certs/EdelCurlRoot-ca.cacert");
+    /* wait for first connection establised to see if we can share it */
+    easy_setopt(curl[i], CURLOPT_PIPEWAIT, 1L);
+    /* go verbose */
+    easy_setopt(curl[i], CURLOPT_VERBOSE, 1L);
+    /* include headers */
+    easy_setopt(curl[i], CURLOPT_HEADER, 1L);
+
+    easy_setopt(curl[i], CURLOPT_RESOLVE, slist);
+  }
+
+  fprintf(stderr, "Start at URL 0\n");
+
+  for(i = 0; i < NUM_HANDLES; i++) {
+    /* add handle to multi */
+    multi_add_handle(m, curl[i]);
+
+    for(;;) {
+      struct timeval interval;
+      fd_set rd, wr, exc;
+      int maxfd = -99;
+
+      interval.tv_sec = 1;
+      interval.tv_usec = 0;
+
+      multi_perform(m, &running);
+
+      abort_on_test_timeout();
+
+      if(!running)
+        break; /* done */
+
+      FD_ZERO(&rd);
+      FD_ZERO(&wr);
+      FD_ZERO(&exc);
+
+      multi_fdset(m, &rd, &wr, &exc, &maxfd);
+
+      /* At this point, maxfd is guaranteed to be greater or equal than -1. */
+
+      select_test(maxfd + 1, &rd, &wr, &exc, &interval);
+
+      abort_on_test_timeout();
+    }
+    wait_ms(1); /* to ensure different end times */
+  }
+
+test_cleanup:
+
+  /* proper cleanup sequence - type PB */
+
+  for(i = 0; i < NUM_HANDLES; i++) {
+    curl_multi_remove_handle(m, curl[i]);
+    curl_easy_cleanup(curl[i]);
+  }
+
+  curl_slist_free_all(slist);
+
+  curl_multi_cleanup(m);
+  curl_global_cleanup();
+
+  return res;
+}