lib: fix unity builds with BearSSL, MSH3, Quiche, OmniOS

- fix MSH3 static symbol clash.
- fix Quiche static symbol clash.
- fix local macro clash with BearSSL header.
- fix loca

lib: fix unity builds with BearSSL, MSH3, Quiche, OmniOS

- fix MSH3 static symbol clash.
- fix Quiche static symbol clash.
- fix local macro clash with BearSSL header.
- fix local macro clash with OmniOS system header.
```
In file included from ../../lib/urldata.h:197,
from ../../lib/altsvc.c:32,
from libcurlall.c:2:
../../lib/cf-socket.h:55:25: error: expected ':', ',', ';', '}' or '__attribute__' before '.' token
55 | #define sa_addr _sa_ex_u.addr
| ^
In file included from ../../lib/urldata.h:197,
from ../../lib/altsvc.c:32,
from libcurlall.c:2:
../../lib/cf-socket.h:55:25: error: expected ':', ',', ';', '}' or '__attribute__' before '.' token
55 | #define sa_addr _sa_ex_u.addr
| ^
```
Ref: https://github.com/curl/curl/actions/runs/10738314933/job/29781644299?pr=14772#step:3:6115

Discovered while adding support for "unity" builds for autotools.

Required-by: #14922
Cherry-picked from #14815
Closes #14932

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lib/src: white space edits to comply better with code style

... as checksrc now finds and complains about these.

Closes #14921

lib: fix AF_INET6 use outside of USE_IPV6

Closes #14858

cf-socket: fix listen pollset for FTP active mode

Follow-up to a07ba37b5e88a89bf4bcc6b0c927f7a42d7ea4f2 which did not
solve the issue of corrent polling for FTP active data connections.

cf-socket: fix listen pollset for FTP active mode

Follow-up to a07ba37b5e88a89bf4bcc6b0c927f7a42d7ea4f2 which did not
solve the issue of corrent polling for FTP active data connections.

Added test cases for active up-/download.

Closes #14786

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cf-socket: fix pollset for listening

When FTP does an active data connection, the socket connection
filter is instantiated with a listening socket. When the filter
adjusts its pollse

cf-socket: fix pollset for listening

When FTP does an active data connection, the socket connection
filter is instantiated with a listening socket. When the filter
adjusts its pollset, it needs to POLLIN, not OUT.

Bug: https://curl.se/mail/lib-2024-08/0023.html
Reported-by: Yoshimasa Ohno
Closes #14766

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lib: use FMT_ as prefix instead of CURL_FORMAT_

For printf format defines used internally. Makes the code slighly
easier to read.

Closes #14764

connect: limit update IP info

Update IP related information at the connection and the transfer in two
places only: once the filter chain connects and when a transfer is added
to a co

connect: limit update IP info

Update IP related information at the connection and the transfer in two
places only: once the filter chain connects and when a transfer is added
to a connection. The latter only updates on reuse when the filters
already are connected.

The only user of that information before a full connect is the HAProxy
filter. Add cfilter CF_QUERY_IP_INFO query to let it find the
information from the filters "below".

This solves two issues with the previous version:
- updates where often done twice with the same info
- happy eyeballing filter "forks" could overwrite each others
updates before the full winner was determined.

Closes #14699

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setopt: allow CURLOPT_INTERFACE to be set to NULL

Ref: https://github.com/curl/curl/discussions/14299#discussioncomment-10393909
Regression from 3060557af702dd591 (shipped in 8.9.0)

setopt: allow CURLOPT_INTERFACE to be set to NULL

Ref: https://github.com/curl/curl/discussions/14299#discussioncomment-10393909
Regression from 3060557af702dd591 (shipped in 8.9.0)

Closes #14629

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cf-socket: prevent KEEPALIVE_FACTOR being set to 1000 for Windows

Fixes #14368
Reported-by: feelingseas on github
Closes #14606

transfer: Curl_sendrecv() and event related improvements

- Renames Curl_readwrite() to Curl_sendrecv() to reflect that it
is mainly about talking to the server, not reads or writes to

transfer: Curl_sendrecv() and event related improvements

- Renames Curl_readwrite() to Curl_sendrecv() to reflect that it
is mainly about talking to the server, not reads or writes to the
client. Add a `nowp` parameter since the single caller already
has this.
- Curl_sendrecv() now runs all possible operations whenever it is
called and either it had been polling sockets or the 'select_bits'
are set.
POLL_IN/POLL_OUT are not always directly related to send/recv
operations. Filters like HTTP/2, QUIC or TLS may monitor reverse
directions. If a transfer does not want to send (KEEP_SEND), it
will not do so, as before. Same for receives.
- Curl_update_timer() now checks the absolute timestamp of an expiry
and the last/new timeout to determine if the application needs
to stop/start/restart its timer. This fixes edge cases where
updates did not happen as they should have.
- improved --test-event curl_easy_perform() simulation to handle
situations where no sockets are registered but a timeout is
in place.
- fixed bug in events_socket() that complained about removing
a socket that was unknown, when indeed it had removed the socket
just before, only it was the last in the list
- fixed conncache's internal handle to carry the multi instance
(where the cache has one) so that operations on the closure handle
trigger event callbacks correctly.
- fixed conncache to not POLL_REMOVE a socket twice when a conneciton
was closed.

Closes #14561

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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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lib: add eos flag to send methods

Adds a `bool eos` flag to send methods to indicate that the data
is the last chunk the invovled transfer wants to send to the server.

This will

lib: add eos flag to send methods

Adds a `bool eos` flag to send methods to indicate that the data
is the last chunk the invovled transfer wants to send to the server.

This will help protocol filters like HTTP/2 and 3 to forward the
stream's EOF flag and also allow to EAGAIN such calls when buffers
are not yet fully flushed.

Closes #14220

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url: dns_entry related improvements

Replace Curl_resolv_unlock() with Curl_resolv_unlink():

-replace inuse member with refcount in Curl_dns_entry

- pass Curl_dns_entry ** t

url: dns_entry related improvements

Replace Curl_resolv_unlock() with Curl_resolv_unlink():

-replace inuse member with refcount in Curl_dns_entry

- pass Curl_dns_entry ** to unlink, so it gets always cleared

- solve potential (but unlikley) UAF in FTP's handling of looked up
Curl_dns_entry. Esp. do not use addr information after unlinking an entry.
In reality, the unlink will not free memory, as the dns entry is still
referenced by the hostcache. But this is not safe and relying on no other
code pruning the cache in the meantime.

- pass permanent flag when adding a dns entry instead of fixing timestamp
afterwards.

url.c: fold several static *resolve_* functions into one.

Closes #14195

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Curl_rand_bytes to control env override

- in DEBUGBUILD, all specifying if true random numbers
are desired or simulated ones via CURL_ENTROPY
- allows to use randoms in other DEBUG

Curl_rand_bytes to control env override

- in DEBUGBUILD, all specifying if true random numbers
are desired or simulated ones via CURL_ENTROPY
- allows to use randoms in other DEBUG checks to not
interfere with the CURL_ENTROPY
- without this change, any Curl_rand() use will alter
results of some AUTHENTICATION methods like DIGEST

Closes #14264

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Revert "lib: send eos flag"

This reverts commit be93299f10ef0b2bf7fe5c82140120073831867a.

lib: send eos flag

Adds a `bool eos` flag to send methods to indicate that the data is the
last chunk the invovled transfer wants to send to the server.

This will help protocol

lib: send eos flag

Adds a `bool eos` flag to send methods to indicate that the data is the
last chunk the invovled transfer wants to send to the server.

This will help protocol filters like HTTP/2 and 3 to forward the
stream's EOF flag and also allow to EAGAIN such calls when buffers are
not yet fully flushed.

Closes #14220

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lib: add failure reason on bind errors

Closes #14221

cf-socket: remove two "useless" assignments

'nread' is already -1, no need to assign it again

Pointed out by CodeSonar

Closes #14145

cf-socket: remove obsolete recvbuf

- recvbuf was never enabled, remove all its code
- remove `fdsave`ing the socket as that is not longer needed

Closes #14138

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

quic: require at least OpenSSL 3.3 for QUIC

- when checking for QUIC support in OpenSSL, also check
for it being at least 3.3.0
- remove workarounds for features buggy or missing i

quic: require at least OpenSSL 3.3 for QUIC

- when checking for QUIC support in OpenSSL, also check
for it being at least 3.3.0
- remove workarounds for features buggy or missing in 3.2

Closes #14026

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cf-socket: optimize curlx_nonblock() and check its return error

Reviewed-by: Stefan Eissing
Closes #13942

tcpkeepalive: add CURLOPT_TCP_KEEPCNT and --keepalive-cnt

Closes #13885