asyn-thread: fix curl_global_cleanup crash in Windows

- Make sure that asynchronous resolves handled by Winsock are stopped
before WSACleanup is called.

This is implemented by

asyn-thread: fix curl_global_cleanup crash in Windows

- Make sure that asynchronous resolves handled by Winsock are stopped
before WSACleanup is called.

This is implemented by ensuring that when Curl_resolver_kill is called
(eg via multi_done) it will cancel the Winsock asynchronous resolve and
wait for the cancellation to complete. Winsock runs the asynchronous
completion routine immediately when a resolve is canceled.

Prior to this change it was possible that during curl_global_cleanup
"a DNS resolver thread created by GetAddrInfoExW did not terminate yet,
however curl is already shutting down, deinitializing Winsock with
WSACleanup() leading to an access violation."

Background:

If libcurl is built with the asynchronous threaded resolver option for
Windows then it resolves in one of two ways. For Windows 8.1 and later,
libcurl resolves by using the Winsock asynchronous resolver which does
its own thread management. For older versions of Windows, libcurl
resolves by creating a separate thread that calls getaddrinfo. This
change only affects the former and it's already handled for the latter.

Reported-by: Ch40zz@users.noreply.github.com

Fixes https://github.com/curl/curl/issues/13509
Closes https://github.com/curl/curl/pull/13518

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asyn-thread: fix Curl_thread_create result check

- Compare to curl_thread_t_null instead of 0 for error.

Currently for both supported thread libraries (pthreads and Windows)
cur

asyn-thread: fix Curl_thread_create result check

- Compare to curl_thread_t_null instead of 0 for error.

Currently for both supported thread libraries (pthreads and Windows)
curl_thread_t_null is defined as 0. However, the pattern throughout the
code is to check against curl_thread_t_null and not 0 since for
posterity some thread library may not use 0 for error.

Closes https://github.com/curl/curl/pull/13542

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build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch ma

build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch makes the source use
the latter for consistency with other similar switches.

`-DENABLE_IPV6` remains accepted for compatibility as a synonym for
`-DUSE_IPV6`, when passed to the compiler.

`ENABLE_IPV6` also remains the name of the CMake and `Makefile.vc`
options to control this feature.

Closes #13349

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asyn-thread: use wakeup_close to close the read descriptor

Reported-by: Dan Fandrich
Ref: #12834
Closes #12836

asyn-thread: silence `-Wcast-align` warning for Windows

Seen with llvm/clang 17:
```
lib/asyn-thread.c:310:5: warning: cast from 'PCHAR' (aka 'char *') to 'struct thread_sync_data *'

asyn-thread: silence `-Wcast-align` warning for Windows

Seen with llvm/clang 17:
```
lib/asyn-thread.c:310:5: warning: cast from 'PCHAR' (aka 'char *') to 'struct thread_sync_data *' increases required alignment from 1 to 8 [-Wcast-align]
310 | CONTAINING_RECORD(overlapped, struct thread_sync_data, w8.overlapped);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.../llvm-mingw/aarch64-w64-mingw32/include/winnt.h:717:48: note: expanded from macro 'CONTAINING_RECORD'
717 | #define CONTAINING_RECORD(address,type,field) ((type *)((PCHAR)(address) - (ULONG_PTR)(&((type *)0)->field)))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

Follow-up to a6bbc87f9e9ffb46a1801dfb983e7534825ed56b #12482

Ref: https://github.com/curl/curl/pull/12482#issuecomment-1873017261
Closes #12615

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asyn-thread: use GetAddrInfoExW on >= Windows 8

For doing async DNS resolution instead of starting a thread for each
request.

Fixes #12481
Closes #12482

Revert "urldata: move async resolver state from easy handle to connectdata"

This reverts commit 56a4db2e4e2bcb9a0dcb75b83560a78ef231fcc8 (#12198)

We want the c-ares channel to be he

Revert "urldata: move async resolver state from easy handle to connectdata"

This reverts commit 56a4db2e4e2bcb9a0dcb75b83560a78ef231fcc8 (#12198)

We want the c-ares channel to be held in the easy handle, not per
connection - for performance.

Closes #12524

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urldata: move async resolver state from easy handle to connectdata

- resolving is done for a connection, not for every transfer
- save create/dup/free of a cares channel for each transfe

urldata: move async resolver state from easy handle to connectdata

- resolving is done for a connection, not for every transfer
- save create/dup/free of a cares channel for each transfer
- check values of setopt calls against a local channel if no
connection has been attached yet, when needed.

Closes #12198

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asyn-thread: use pipe instead of socketpair for IPC when available

If pipe() is present. Less overhead.

Helped-by: Viktor Szakats
Closes #12146

resolve: use PF_INET6 family lookups when CURL_IPRESOLVE_V6 is set

Previously it would always do PF_UNSPEC if CURL_IPRESOLVE_V4 is not
used, thus unnecessarily asking for addresses that

resolve: use PF_INET6 family lookups when CURL_IPRESOLVE_V6 is set

Previously it would always do PF_UNSPEC if CURL_IPRESOLVE_V4 is not
used, thus unnecessarily asking for addresses that will not be used.

Reported-by: Joseph Tharayil
Fixes #11564
Closes #11565

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checksrc: disallow spaces before labels

Out of 415 labels throughout the code base, 86 of those labels were
not at the start of the line. Which means labels always at the start of
th

checksrc: disallow spaces before labels

Out of 415 labels throughout the code base, 86 of those labels were
not at the start of the line. Which means labels always at the start of
the line is the favoured style overall with 329 instances.

Out of the 86 labels not at the start of the line:
* 75 were indented with the same indentation level of the following line
* 8 were indented with exactly one space
* 2 were indented with one fewer indentation level then the following
line
* 1 was indented with the indentation level of the following line minus
three space (probably unintentional)

Co-Authored-By: Viktor Szakats

Closes #11134

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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netware: remove leftover traces

Commit 3b16575ae938dec2a29454631a12aa52b6ab9c67 removed support for
building on Novell Netware, but a few leftover traces remained. This
removes the l

netware: remove leftover traces

Commit 3b16575ae938dec2a29454631a12aa52b6ab9c67 removed support for
building on Novell Netware, but a few leftover traces remained. This
removes the last bits.

Closes: #9966
Reviewed-by: Daniel Stenberg <daniel@haxx.se>

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CURLOPT_QUICK_EXIT: don't wait for DNS thread on exit

Fixes #2975
Closes #9147

tidy-up: process.h detection and use

This patch aims to cleanup the use of `process.h` header and the macro
`HAVE_PROCESS_H` associated with it.

- `process.h` is always availabl

tidy-up: process.h detection and use

This patch aims to cleanup the use of `process.h` header and the macro
`HAVE_PROCESS_H` associated with it.

- `process.h` is always available on Windows. In curl, it is required
only for `_beginthreadex()` in `lib/curl_threads.c`.

- `process.h` is also available in MS-DOS. In curl, its only use was in
`lib/smb.c` for `getpid()`. But `getpid()` is in fact declared by
`unistd.h`, which is always enabled via `lib/config-dos.h`. So the
header is not necessary.

- `HAVE_PROCESS_H` was detected by CMake, forced to 1 on Windows and
left to real detection for other platforms.
It was also set to always-on in `lib/config-win32.h` and
`lib/config-dos.h`.
In autotools builds, there was no detection and the macro was never
set.

Based on these observations, in this patch we:

- Rework Windows `getpid` logic in `lib/smb.c` to always use the
equivalent direct Win32 API function `GetCurrentProcessId()`, as we
already did for Windows UWP apps. This makes `process.h` unnecessary
here on Windows.

- Stop #including `process.h` into files where it was not necessary.
This is everywhere, except `lib/curl_threads.c`.

> Strangely enough, `lib/curl_threads.c` compiled fine with autotools
> because `process.h` is also indirecty included via `unistd.h`. This
> might have been broken in autotools MSVC builds, where the latter
> header is missing.

- Delete all remaining `HAVE_PROCESS_H` feature guards, for they were
unnecessary.

- Delete `HAVE_PROCESS_H` detection from CMake and predefined values
from `lib/config-*.h` headers.

Reviewed-by: Jay Satiro
Closes #9703

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misc: remove duplicated include files

Closes #9796

hostip: lazily wait to figure out if IPv6 works until needed

The check may take many milliseconds, so now it is performed once the
value is first needed. Also, this change makes sure tha

hostip: lazily wait to figure out if IPv6 works until needed

The check may take many milliseconds, so now it is performed once the
value is first needed. Also, this change makes sure that the value is
not used if the resolve is set to be IPv4-only.

Closes #9553

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resolve: make forced IPv4 resolve only use A queries

This protects IPv4-only transfers from undesired bad IPv6-related side
effects and make IPv4 transfers in dual-stack libcurl behave t

resolve: make forced IPv4 resolve only use A queries

This protects IPv4-only transfers from undesired bad IPv6-related side
effects and make IPv4 transfers in dual-stack libcurl behave the same
way as in IPv4 single-stack libcurl.

Closes #9540

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asyn-thread: fix socket leak on OOM

Closes #9310

asyn-thread: make getaddrinfo_complete return CURLcode

... as the only caller that cares about what it returns assumes that
anyway. This caused icc to warn:

asyn-thread.c(505):

asyn-thread: make getaddrinfo_complete return CURLcode

... as the only caller that cares about what it returns assumes that
anyway. This caused icc to warn:

asyn-thread.c(505): error #188: enumerated type mixed with another type
result = getaddrinfo_complete(data);

Repoorted-by: Matthew Thompson
Bug: https://github.com/curl/curl/issues/9081#issuecomment-1182143076
Closes #9146

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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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strerror.h: remove the #include from files not using it

CURLOPT_IPRESOLVE: preventing wrong IP version from being used

In some situations, it was possible that a transfer was setup to
use an specific IP version, but due do DNS caching or conn

CURLOPT_IPRESOLVE: preventing wrong IP version from being used

In some situations, it was possible that a transfer was setup to
use an specific IP version, but due do DNS caching or connection
reuse, it ended up using a different IP version from requested.

This commit changes the effect of CURLOPT_IPRESOLVE from simply
restricting address resolution to preventing the wrong connection
type being used, when choosing a connection from the pool, and
to restricting what addresses could be used when establishing
a new connection.

It is important that all addresses versions are resolved, even if
not used in that transfer in particular, because the result is
cached, and could be useful for a different transfer with a
different CURLOPT_IPRESOLVE setting.

Closes #6853

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tidy-up: make conditional checks more consistent

... remove '== NULL' and '!= 0'

Closes #6912

asyn-ares: use consistent resolve error message

... with the help of Curl_resolver_error() which now is moved from
asyn-thead.c and is provided globally for this purpose.

Follow

asyn-ares: use consistent resolve error message

... with the help of Curl_resolver_error() which now is moved from
asyn-thead.c and is provided globally for this purpose.

Follow-up to 35ca04ce1b77636

Makes test 1188 work for c-ares builds

Closes #6626

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