vquic: recv_mmsg, use fewer, but larger buffers

Reported-by: koujaz on github
Fixes #15267
Closes #15454

vquic: fix compiler warning with gcc + MUSL

```
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c: In function 'msghdr_get_udp_gro':
/Users/runner/work/curl-for-win

vquic: fix compiler warning with gcc + MUSL

```
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c: In function 'msghdr_get_udp_gro':
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c:344: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
344 | #pragma clang diagnostic push
|
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c:345: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
345 | #pragma clang diagnostic ignored "-Wsign-compare"
|
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c:346: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
346 | #pragma clang diagnostic ignored "-Wcast-align"
|
/Users/runner/work/curl-for-win/curl-for-win/curl/lib/vquic/vquic.c:350: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
350 | #pragma clang diagnostic pop
|
```
https://github.com/curl/curl-for-win/actions/runs/11356281008/job/31587180874#step:3:9534

Follow-up to a571afc02e11c1ab9a9f59c2150e11acca423fcc #14012
Closes #15303

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quic: use send/recvmmsg when available

add checks for sendmmsg in configure and CmakeLists.txt for enabling use
of these functions in ngtcp2/quiche quic.

Closes #14880

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,

tidy-up: OS names

Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.

Mostly OS names and a few more.

Also a couple of other minor text fixups.

Closes #14360

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code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname

code: language cleanup in comments

Based on the standards and guidelines we use for our documentation.

- expand contractions (they're => they are etc)
- host name = > hostname
- file name => filename
- user name = username
- man page => manpage
- run-time => runtime
- set-up => setup
- back-end => backend
- a HTTP => an HTTP
- Two spaces after a period => one space after period

Closes #14073

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vquic: fix UDP_GRO struct cmsghdr data type

The data type for UDP_GRO in struct cmsghdr is int. Limit the usage of
UDP_GRO to linux only because it is not portable.

Closes #14056

quic: enable UDP GRO

Closes #14012

lib: merge `ENABLE_QUIC` C macro into `USE_HTTP3`

Before this patch `lib/curl_setup.h` defined these two macros right
next to each other, then the source code used them interchangeably.

lib: merge `ENABLE_QUIC` C macro into `USE_HTTP3`

Before this patch `lib/curl_setup.h` defined these two macros right
next to each other, then the source code used them interchangeably.

After this patch, `USE_HTTP3` guards all HTTP/3 / QUIC features.
(Like `USE_HTTP2` does for HTTP/2.) `ENABLE_QUIC` is no longer used.

This patch doesn't change the way HTTP/3 is enabled via autotools
or CMake. Builders who enabled HTTP/3 manually by defining both of
these macros via `CPPFLAGS` can now delete `-DENABLE_QUIC`.

Closes #13352

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lib: keep conn IP information together

new struct ip_quadruple for holding local/remote addr+port

- used in data->info and conn and cf-socket.c
- copy back and forth complete st

lib: keep conn IP information together

new struct ip_quadruple for holding local/remote addr+port

- used in data->info and conn and cf-socket.c
- copy back and forth complete struct
- add 'secondary' to conn
- use secondary in reporting success for ftp 2nd connection

Reported-by: DasKutti on github
Fixes #13084
Closes #13090

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http3: initial support for OpenSSL 3.2 QUIC stack

- HTTP/3 for curl using OpenSSL's own QUIC stack together
with nghttp3
- configure with `--with-openssl-quic` to enable curl to

http3: initial support for OpenSSL 3.2 QUIC stack

- HTTP/3 for curl using OpenSSL's own QUIC stack together
with nghttp3
- configure with `--with-openssl-quic` to enable curl to
build this. This requires the nghttp3 library
- implementation with the following restrictions:
* macOS has to use an unconnected UDP socket due to an
issue in OpenSSL's datagram implementation
See https://github.com/openssl/openssl/issues/23251
This makes connections to non-reponsive servers hang.
* GET requests will send the indicator that they have
no body in a separate QUIC packet. This may result
in processing delays or Transfer-Encodings on proxied
requests
* uploads that encounter blocks will use 100% cpu as
detection of these flow control issue is not working
(we have not figured out to pry that from OpenSSL).

Closes #12734

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vquic: extract TLS setup into own source

- separate ngtcp2 specific parts out
- provide callback during init to allow ngtcp2 to apply its defaults

Closes #12678

build: enable missing OpenSSF-recommended warnings, with fixes

https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++.html
as of 2023-11-29 [1]

build: enable missing OpenSSF-recommended warnings, with fixes

https://best.openssf.org/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C++.html
as of 2023-11-29 [1].

Enable new recommended warnings (except `-Wsign-conversion`):

- enable `-Wformat=2` for clang (in both cmake and autotools).
- add `CURL_PRINTF()` internal attribute and mark functions accepting
printf arguments with it. This is a copy of existing
`CURL_TEMP_PRINTF()` but using `__printf__` to make it compatible
with redefinting the `printf` symbol:
https://gcc.gnu.org/onlinedocs/gcc-3.0.4/gcc_5.html#SEC94
- fix `CURL_PRINTF()` and existing `CURL_TEMP_PRINTF()` for
mingw-w64 and enable it on this platform.
- enable `-Wimplicit-fallthrough`.
- enable `-Wtrampolines`.
- add `-Wsign-conversion` commented with a FIXME.
- cmake: enable `-pedantic-errors` the way we do it with autotools.
Follow-up to d5c0351055d5709da8f3e16c91348092fdb481aa #2747
- lib/curl_trc.h: use `CURL_FORMAT()`, this also fixes it to enable format
checks. Previously it was always disabled due to the internal `printf`
macro.

Fix them:

- fix bug where an `set_ipv6_v6only()` call was missed in builds with
`--disable-verbose` / `CURL_DISABLE_VERBOSE_STRINGS=ON`.
- add internal `FALLTHROUGH()` macro.
- replace obsolete fall-through comments with `FALLTHROUGH()`.
- fix fallthrough markups: Delete redundant ones (showing up as
warnings in most cases). Add missing ones. Fix indentation.
- silence `-Wformat-nonliteral` warnings with llvm/clang.
- fix one `-Wformat-nonliteral` warning.
- fix new `-Wformat` and `-Wformat-security` warnings.
- fix `CURL_FORMAT_SOCKET_T` value for mingw-w64. Also move its
definition to `lib/curl_setup.h` allowing use in `tests/server`.
- lib: fix two wrongly passed string arguments in log outputs.
Co-authored-by: Jay Satiro
- fix new `-Wformat` warnings on mingw-w64.

[1] https://github.com/ossf/wg-best-practices-os-developers/blob/56c0fde3895bfc55c8a973ef49a2572c507b2ae1/docs/Compiler-Hardening-Guides/Compiler-Options-Hardening-Guide-for-C-and-C%2B%2B.md

Closes #12489

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quic: manage connection idle timeouts

- configure a 120s idle timeout on our side of the connection
- track the timestamp when actual socket IO happens
- check IO timestamp to our *a

quic: manage connection idle timeouts

- configure a 120s idle timeout on our side of the connection
- track the timestamp when actual socket IO happens
- check IO timestamp to our *and* the peer's idle timeouts
in "is this connection alive" checks

Reported-by: calvin2021y on github
Fixes #12064
Closes #12077

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http2: polish things around POST

- added test cases for various code paths
- fixed handling of blocked write when stream had
been closed inbetween attempts
- re-enabled DEBUGAS

http2: polish things around POST

- added test cases for various code paths
- fixed handling of blocked write when stream had
been closed inbetween attempts
- re-enabled DEBUGASSERT on send with smaller data size

- in debug builds, environment variables can be set to simulate a slow
network when sending data. cf-socket.c and vquic.c support
* CURL_DBG_SOCK_WBLOCK: percentage of send() calls that should be
answered with a EAGAIN. TCP/UNIX sockets.
This is chosen randomly.
* CURL_DBG_SOCK_WPARTIAL: percentage of data that shall be written
to the network. TCP/UNIX sockets.
Example: 80 means a send with 1000 bytes would only send 800
This is applied to every send.
* CURL_DBG_QUIC_WBLOCK: percentage of send() calls that should be
answered with EAGAIN. QUIC only.
This is chosen randomly.

Closes #11756

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lib: fix null ptr derefs and uninitialized vars (h2/h3)

Fixing compiler warnings with gcc 13.2.0 in unity builds.

Assisted-by: Jay Satiro
Assisted-by: Stefan Eissing
Closes

lib: fix null ptr derefs and uninitialized vars (h2/h3)

Fixing compiler warnings with gcc 13.2.0 in unity builds.

Assisted-by: Jay Satiro
Assisted-by: Stefan Eissing
Closes #11739

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http3/ngtcp2: shorten handshake, trace cleanup

- shorten handshake timing by delayed x509 store load (OpenSSL)
as we do for HTTP/2
- cleanup of trace output, align with HTTP/2 outp

http3/ngtcp2: shorten handshake, trace cleanup

- shorten handshake timing by delayed x509 store load (OpenSSL)
as we do for HTTP/2
- cleanup of trace output, align with HTTP/2 output

Closes #11609

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vquic: show stringified messages for errno

Closes #11584

trace: make tracing available in non-debug builds

Add --trace-config to curl

Add curl_global_trace() to libcurl

Closes #11421

lib: fix some format specifiers

- Use CURL_FORMAT_CURL_OFF_T where %zd was erroneously used for some
curl_off_t variables.

- Use %zu where %zd was erroneously used for some si

lib: fix some format specifiers

- Use CURL_FORMAT_CURL_OFF_T where %zd was erroneously used for some
curl_off_t variables.

- Use %zu where %zd was erroneously used for some size_t variables.

Prior to this change some of the Windows CI tests were failing because
in Windows 32-bit targets have a 32-bit size_t and a 64-bit curl_off_t.
When %zd was used for some curl_off_t variables then only the lower
32-bits was read and the upper 32-bits would be read for part or all of
the next specifier.

Fixes https://github.com/curl/curl/issues/11327
Closes https://github.com/curl/curl/pull/11321

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lib: remove unused functions, make single-use static

Closes #11174

vquic.c: make recvfrom_packets static, avoid compiler warning

warning: no previous prototype for 'recvfrom_packets'

Reported-by: Keitagit-kun on github
Fixes #11146
Closes #

vquic.c: make recvfrom_packets static, avoid compiler warning

warning: no previous prototype for 'recvfrom_packets'

Reported-by: Keitagit-kun on github
Fixes #11146
Closes #11148

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h2/h3: replace `state.drain` counter with `state.dselect_bits`

- `drain` was used by http/2 and http/3 implementations to indicate
that the transfer requires send/recv independant from

h2/h3: replace `state.drain` counter with `state.dselect_bits`

- `drain` was used by http/2 and http/3 implementations to indicate
that the transfer requires send/recv independant from its socket
poll state. Intended as a counter, it was used as bool flag only.
- a similar mechanism exists on `connectdata->cselect_bits` where
specific protocols can indicate something similar, only for the
whole connection.
- `cselect_bits` are cleard in transfer.c on use and, importantly,
also set when the transfer loop expended its `maxloops` tries.
`drain` was not cleared by transfer and the http2/3 implementations
had to take care of that.
- `dselect_bits` is cleared *and* set by the transfer loop. http2/3
does no longer clear it, only set when new events happen.

This change unifies the handling of socket poll overrides, extending
`cselect_bits` by a easy handle specific value and a common treatment in
transfers.

Closes #11005

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http3: improvements across backends

- ngtcp2: using bufq for recv stream data
- internal stream_ctx instead of `struct HTTP` members
for quiche, ngtcp2 and msh3
- no more QUIC

http3: improvements across backends

- ngtcp2: using bufq for recv stream data
- internal stream_ctx instead of `struct HTTP` members
for quiche, ngtcp2 and msh3
- no more QUIC related members in `struct HTTP`
- experimental use of recvmmsg(), disabled by default
- testing on my old debian box shows no throughput improvements.
- leaving it in, but disabled, for future revisit
- vquic: common UDP receive code for ngtcp2 and quiche
- vquic: common UDP send code for ngtcp2 and quiche
- added pytest skips for known msh3 failures
- fix unit2601 to survive torture testing
- quiche: using latest `master` from quiche and enabling large download
tests, now that key change is supported
- fixing test_07_21 where retry handling of starting a stream
was faulty
- msh3: use bufq for recv buffering headers and data
- msh3: replace fprintf debug logging with LOG_CF where possible
- msh3: force QUIC expire timers on recv/send to have more than
1 request per second served

Closes #10772

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ngtcp2: adjust config and code checks for ngtcp2 without nghttp3

- make configure show on HTTP3 feature that both ngtcp2 and nghttp3
are in play
- define ENABLE_QUIC only when USE_

ngtcp2: adjust config and code checks for ngtcp2 without nghttp3

- make configure show on HTTP3 feature that both ngtcp2 and nghttp3
are in play
- define ENABLE_QUIC only when USE_NGTCP2 and USE_NGHTTP3 are defined
- add USE_NGHTTP3 in the ngtcp2 implementation

Fixes #10793
Closes #10821

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http: fix unix domain socket use in https connects

- when h2/h3 eyeballing was involved, unix domain socket
configurations were not honoured
- configuring --unix-socket will disabl

http: fix unix domain socket use in https connects

- when h2/h3 eyeballing was involved, unix domain socket
configurations were not honoured
- configuring --unix-socket will disable HTTP/3 as candidate for eyeballing
- combinatino of --unix-socket and --http3-only will fail during initialisation
- adding pytest test_11 to reproduce

Reported-by: Jelle van der Waa
Fixes #10633
Closes #10641

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