curl_setup: define _WIN32_WINNT_[OS] symbols

.. because not all Windows build systems have those symbols, and even
those that do may be missing newer symbols (eg the Windows 7 SDK does

curl_setup: define _WIN32_WINNT_[OS] symbols

.. because not all Windows build systems have those symbols, and even
those that do may be missing newer symbols (eg the Windows 7 SDK does
not define _WIN32_WINNT_WIN10).

Those symbols are used in build-time logic to decide which API to use
and prior to this change if the symbols were missing it would have
resulted in deprecated API being used when more recent functions were
available (eg GetVersionEx used instead of VerifyVersionInfo).

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

Probably fixes https://github.com/curl/curl/issues/4995
Closes https://github.com/curl/curl/pull/5057

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curl_setup: fix `CURLRES_IPV6` condition

Move the definition of `CURLRES_IPV6` to before undefining
`HAVE_GETADDRINFO`. Regression from commit 67a08dca27a which caused
some tests to

curl_setup: fix `CURLRES_IPV6` condition

Move the definition of `CURLRES_IPV6` to before undefining
`HAVE_GETADDRINFO`. Regression from commit 67a08dca27a which caused
some tests to fail and others to be skipped with c-ares.

Fixes https://github.com/curl/curl/issues/4673
Closes https://github.com/curl/curl/pull/4677

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curl_setup: disable IPv6 resolver without `getaddrinfo`

Also, use `CURLRES_IPV6` only for actual DNS resolution, not for IPv6
address support. This makes it possible to connect to IPv6 l

curl_setup: disable IPv6 resolver without `getaddrinfo`

Also, use `CURLRES_IPV6` only for actual DNS resolution, not for IPv6
address support. This makes it possible to connect to IPv6 literals by
setting `ENABLE_IPV6` even without `getaddrinfo` support. It also fixes
the CMake build when using the synchronous resolver without
`getaddrinfo` support.

Closes https://github.com/curl/curl/pull/4662

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build: Disable Visual Studio warning "conditional expression is constant"

- Disable warning C4127 "conditional expression is constant" globally
in curl_setup.h for when building with M

build: Disable Visual Studio warning "conditional expression is constant"

- Disable warning C4127 "conditional expression is constant" globally
in curl_setup.h for when building with Microsoft's compiler.

This mainly affects building with the Visual Studio project files found
in the projects dir.

Prior to this change the cmake and winbuild build systems already
disabled 4127 globally for when building with Microsoft's compiler.
Also, 4127 was already disabled for all build systems in the limited
circumstance of the WHILE_FALSE macro which disabled the warning
specifically for while(0). This commit removes the WHILE_FALSE macro and
all other cruft in favor of disabling globally in curl_setup.

Background:

We have various macros that cause 0 or 1 to be evaluated, which would
cause warning C4127 in Visual Studio. For example this causes it:

#define Curl_resolver_asynch() 1

Full behavior is not clearly defined and inconsistent across versions.
However it is documented that since VS 2015 Update 3 Microsoft has
addressed this somewhat but not entirely, not warning on while(true) for
example.

Prior to this change some C4127 warnings occurred when I built with
Visual Studio using the generated projects in the projects dir.

Closes https://github.com/curl/curl/pull/4658

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TLS: add BearSSL vtls implementation

Closes #4597

cleanup: remove DOT_CHAR completely

Follow-up to f9c7ba9096ec

The use of DOT_CHAR for ".ssh" was probably a mistake and is removed
now.

Pointed-out-by: Gisle Vanem

cleanup: remove DOT_CHAR completely

Follow-up to f9c7ba9096ec

The use of DOT_CHAR for ".ssh" was probably a mistake and is removed
now.

Pointed-out-by: Gisle Vanem
Bug: https://github.com/curl/curl/pull/4230#issuecomment-522960638

Closes #4247

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plan9: add support for running on Plan 9

Closes #3701

HTTP3: initial (experimental) support

USe configure --with-ngtcp2 or --with-quiche

Using either option will enable a HTTP3 build.
Co-authored-by: Alessandro Ghedini <alessandro@

HTTP3: initial (experimental) support

USe configure --with-ngtcp2 or --with-quiche

Using either option will enable a HTTP3 build.
Co-authored-by: Alessandro Ghedini <alessandro@ghedini.me>

Closes #3500

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wolfssl: refer to it as wolfSSL only

Remove support for, references to and use of "cyaSSL" from the source
and docs. wolfSSL is the current name and there's no point in keeping
refer

wolfssl: refer to it as wolfSSL only

Remove support for, references to and use of "cyaSSL" from the source
and docs. wolfSSL is the current name and there's no point in keeping
references to ancient history.

Assisted-by: Daniel Gustafsson

Closes #3903

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PolarSSL: deprecate support step 1. Removed from configure.

Also removed mentions from most docs.

Discussed: https://curl.haxx.se/mail/lib-2019-05/0045.html

Closes #3888

ssh: define USE_SSH if SSH is enabled (any backend)

Closes #3846

configure: add --with-amissl

AmiSSL is an Amiga native library which provides a wrapper over OpenSSL.
It also requires all programs using it to use bsdsocket.library
directly, rather

configure: add --with-amissl

AmiSSL is an Amiga native library which provides a wrapper over OpenSSL.
It also requires all programs using it to use bsdsocket.library
directly, rather than accessing socket functions through clib, which
libcurl was not necessarily doing previously. Configure will now check
for the headers and ensure they are included if found.

Closes #3677

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Secure Transport: no more "darwinssl"

Everyone calls it Secure Transport, now we do too.

Reviewed-by: Nick Zitzmann

Closes #3619

cleanup: make local functions static

urlapi: turn three local-only functions into statics

conncache: make conncache_find_first_connection static

multi: make detach_connnect

cleanup: make local functions static

urlapi: turn three local-only functions into statics

conncache: make conncache_find_first_connection static

multi: make detach_connnection static

connect: make getaddressinfo static

curl_ntlm_core: make hmac_md5 static

http2: make two functions static

http: make http_setup_conn static

connect: make tcpnodelay static

tests: make UNITTEST a thing to mark functions with, so they can be static for
normal builds and non-static for unit test builds

... and mark Curl_shuffle_addr accordingly.

url: make up_free static

setopt: make vsetopt static

curl_endian: make write32_le static

rtsp: make rtsp_connisdead static

warnless: remove unused functions

memdebug: remove one unused function, made another static

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axtls: removed

As has been outlined in the DEPRECATE.md document, the axTLS code has
been disabled for 6 months and is hereby removed.

Use a better supported TLS library!

axtls: removed

As has been outlined in the DEPRECATE.md document, the axTLS code has
been disabled for 6 months and is hereby removed.

Use a better supported TLS library!

Assisted-by: Daniel Gustafsson
Closes #3194

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curl_setup: define NOGDI on Windows

This avoids an ERROR macro clash between <wingdi.h> and <arpa/tftp.h>
on MinGW.

Closes https://github.com/curl/curl/pull/3113

vtls: add a MesaLink vtls backend

Closes #2984

http: fix for tiny "HTTP/0.9" response

Deal with tiny "HTTP/0.9" (header-less) responses by checking the
status-line early, even before a full "HTTP/" is received to allow
detecting

http: fix for tiny "HTTP/0.9" response

Deal with tiny "HTTP/0.9" (header-less) responses by checking the
status-line early, even before a full "HTTP/" is received to allow
detecting 0.9 properly.

Test 1266 and 1267 added to verify.

Fixes #2420
Closes #2872

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lib/curl_setup.h: remove unicode character

Follow-up to 82ce416.

Ref: https://github.com/curl/curl/commit/8272ec5#commitcomment-29646818

lib/curl_setup.h: remove unicode bom from 8272ec50f02

curl_setup: include <winerror.h> before <windows.h>

Otherwise, only part of it gets pulled in through <windows.h> on
original MinGW.

Fixes https://github.com/curl/curl/issues/23

curl_setup: include <winerror.h> before <windows.h>

Otherwise, only part of it gets pulled in through <windows.h> on
original MinGW.

Fixes https://github.com/curl/curl/issues/2361
Closes https://github.com/curl/curl/pull/2721

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configure: check for declaration of getpwuid_r

On our x86 Android toolchain, getpwuid_r is implemented but the header
is missing:

netrc.c:81:7: error: implicit declaration of f

configure: check for declaration of getpwuid_r

On our x86 Android toolchain, getpwuid_r is implemented but the header
is missing:

netrc.c:81:7: error: implicit declaration of function 'getpwuid_r' [-Werror=implicit-function-declaration]

Unfortunately, the function is used in curl_ntlm_wb.c, too, so I moved
the prototype to curl_setup.h.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
Closes #2609

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curl_setup: provide a CURL_SA_FAMILY_T type if none exists

... and use this type instead of 'sa_family_t' in the code since several
platforms don't have it.

Closes #2463

vauth/cleartext: fix integer overflow check

Make the integer overflow check not rely on the undefined behavior that
a size_t wraps around on overflow.

Detected by lgtm.com
C

vauth/cleartext: fix integer overflow check

Make the integer overflow check not rely on the undefined behavior that
a size_t wraps around on overflow.

Detected by lgtm.com
Closes #2408

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curl_setup: move the precautionary define of SIZEOF_TIME_T

... up to before it may be used for the TIME_T_MAX/MIN logic.

Reported-by: Michael Kaufmann