miniupnpc::miniupnpc becomes an ALIAS for the shared library, if
available, and the static library otherwise.
Users of the installed library can use MINIUPNPC_USE_STATIC_LIBS to
force the use of the static library.
GetBestInterfaceEx() is not supported by older i586-mingw32msvc-gcc
compiler. GetBestInterface() works only with IPv4 addresses but in this
case it is enough as it is needed only for IP address 223.255.255.255.
Older version of i586-mingw32msvc-gcc compiler does not define
_WIN32_WINNT_VISTA macro. Therefore preprocessor #if condition is
incorrectly evaluated.
* Move it into separate win32_snprintf.h file to de-duplicate its
implementation from all miniupnp source files.
* Do not use this emulation with mingw32 SDK when __NO_ISOCEXT is not
defined as in this case mingw32 provides working snprintf function.
* Fix detection for mingw-w64 variants, when __NO_ISOCEXT is defined or
when older version without UCRT is used.
* Add check if _scprintf function is available. In case it is not available
just returns length of filled buffer to prevent buffer overflow.
_snprintf() differs from snprintf() in:
* on overflow it returns -1 instead of required buffer size
* on overflow it does not fill nul byte
* does not accept NULL/0 as a buffer
Microsoft implemented snprintf() in Visual Studio 2015 as part of UCRT.
Mingw32 contains snprintf() implementation only when __USE_MINGW_ANSI_STDIO
is defined.
Mingw-w64 versions prior to 8.0.0. contain snprintf() implementation when
__USE_MINGW_ANSI_STDIO or _UCRT is defined. Since version 8.0.0 it is
always supported.
Mingw-w64 defines both __MINGW32__ and __MINGW64_VERSION_MAJOR macros.
Mingw32 defines only __MINGW32__.
_scprintf() just count number of bytes needed for formatting string, so it
is basically return value of snprintf().
This change updates miniupnpc code to use snprintf() when is provided by
compiler/runtime to avoid usage _snprintf().
And also this changes updates miniupnpc emulation of snprintf() by
_snprintf() and _scprintf() functions to avoid buffer overflows.
For inspiration full emulation of snprintf() by _snprintf() is available in
mingw-w64 stdio library:
https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/stdio/snprintf.c
Check for 0.0.0.0, 192.168., 10. and 172. is not enough. Nowadays routers
behind NAT are getting IP address from shared CG-NAT space 100.64.0.0/10.
This patch adjust miniupnpc to check for all reserved IPv4 addresses.
