The "-unix <path>" argument allows s_server and s_client to use a unix
domain socket in the filesystem instead of IPv4 ("-connect", "-port",
"-accept", etc). If s_server exits gracefully, such as when "-naccept"
is used and the requested number of SSL/TLS connections have occurred,
then the domain socket file is removed. On ctrl-C, it is likely that
the stale socket file will be left over, such that s_server would
normally fail to restart with the same arguments. For this reason,
s_server also supports an "-unlink" option, which will clean up any
stale socket file before starting.

If you have any reason to want encrypted IPC within an O/S instance,
this concept might come in handy. Otherwise it just demonstrates that
there is nothing about SSL/TLS that limits it to TCP/IP in any way.

(There might also be benchmarking and profiling use in this path, as
unix domain sockets are much lower overhead than connecting over local
IP addresses).
Signed-off-by: NGeoff Thorpe <geoff@openssl.org>

Windows 8 SDKs complain that GetVersion() is deprecated.

We only use GetVersion like this:

	(GetVersion() < 0x80000000)

which checks if the Windows version is NT based. Use a macro check_winnt()
which uses GetVersion() on older SDK versions and true otherwise.

Submitted by: Pierre Delaage

e_os2.h, this should fix WIN32 compilation issues and hopefully avoid
conflicts with other headers which may workaround ssize_t in different ways.

Submitted By: De Rudder, Stephen L." <s_derudder@tditx.com>

Workaround for newer Windows headers which define EADDRINUSE but not to the
same value as WSAEADDRINUSE.

Submitted by: steve@openssl.org

Some systems have broken IPv6 headers and/or implementations. If
OPENSSL_USE_IPV6 is set to 0 IPv6 is not used, if it is set to 1 it is used
and if undefined an attempt is made to detect at compile time by checking
if AF_INET6 is set and excluding known problem platforms.

.DLL, in particular static build. The issue has been discussed in RT#1230
and later on openssl-dev, and mutually exclusive approaches were suggested.
This completes compromise solution suggested in RT#1230.
PR: 1230

Submitted by: Guenter Knauf <eflash@gmx.net>

PR: 1312
Submitted by: Oliver Tappe <zooey@hirschkaefer.de>
Reviewed by: Ulf Moeller

This works because wsock32 commonly loads ws2_32 anyway and we [intend to]
check upon presense of winsock2-specific API at run-time.

from .h files...

more work, i.e. more modifications are due...

PR: 1196

PR: 1196
Submitted by: Russel Ruby

PR: 1110

That should solve the issues with propagating it through the Makefiles.

PR: 1110

1107.  He says:

This is a followup to the NetWare patch that was applied to beta3.  It
does the following:

- Fixes a problem in the CLib build with undefined symbols.

- Adds the ability to use BSD sockets as the default for the OpenSSL
  socket BIO.  NetWare supports 2 flavors of sockets and our Apache
  developers need BSD sockets as a configurable option when building
  OpenSSL.  This adds that for them.

- Updates to the INSTALL.NW file to explain new options.

I have tried very hard to make sure all the changes are in NetWare
specific files or guarded carefully to make sure they only impact
NetWare builds.  I have tested the Windows build to make sure it does
not break that since we have made changes to mk1mf.pl.

We are still working the gcc cross compile for NetWare issue and hope
to have a patch for that before beta 6 is released.

PR: 1098

inspired by VC6 failure report. In addition abstain from taking screen
snapshots when running in NT service context.

environments.

The changes have been mailed to <crypt@bis.doc.gov> as well.

PR: 903

PR: 780
Submitted by: Verdon Walker <VWalker@novell.com>
Reviewed by: Richard Levitte

time involving VxWorks on MIPS

Contributed by Bob Bradley <bob@chaoticsoftware.com>

platforms that don't (necessarely) have it.  In the case of VMS, this
means moving a couple of functions from apps/ to crypto/ and make them
general (although only used privately).

take care of returning if necessary.