LibVNCClient: Remove all those WITH_CLIENT_TLS #ifdefs and move GnuTLS specific functionality into tls_gnutls.c.

Bugfixes and support for tight encoding with zlib.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Keys got stuck because unicode is 0 upon SDL_KEYUP events, even if the
same key event sets unicode correctly in SDL_KEYDOWN events.

Work around that for the common case (ASCII) using the fact that both SDL
and X11 keysyms were created with ASCII compatibility in mind. So as long
as we type ASCII symbols, we can map things trivially.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Besided making libvncserver reverseVNC IPv6-aware, this introduces some changes
on the client side as well to make clients listen on IPv6 sockets, too. Like
the server side, this also uses a separate-socket approach.

We have to properly free the addrinfo struct when jumping out of the
function.

IPv6 support for LibVNCServer, part twopointone: properly surround IPv6 addresses with [] for noVNC URL.

Some browsers omit the square brackets in document.location.hostname, so add them if missing.

As done with the RFB sockets, this uses a separate-socket approach as well.

Without this, we would have gotten a stale IPv4 socket in a race
condition.

There was an oversight that crept in...

This uses a separate-socket approach since there are systems that do not
support dual binding sockets under *any* circumstances, for instance
OpenBSD. Using separate sockets for IPv4 and IPv6 is thus more portable
than having a v6 socket handle v4 connections as well.
Signed-off-by: Christian Beier <dontmind@freeshell.org>

I think it may encourage people to implement more features for the viewer,
because a GTK GUI seems to be easier to implement than a SDL one
(and it is more integrated with the major Linux Desktops out there).
Signed-off-by: Christian Beier <dontmind@freeshell.org>

Support connections from the Mac OS X built-in VNC client to
LibVNCServers running with no password and advertising a server
version of 3.7 or greater.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

For security reasons, it can be important to limit which IP addresses a
LibVNCClient-based client should listen for reverse connections. This
commit adds that option.

To preserve binary backwards-compatibility, the field was added to the end
of the rfbclient struct, and the function ListenAtTcpPort retains its
signature (but calls the new ListenAtTcpPortAndAddress).

[jes: shortened the commit subject, added a longer explanation in the
commit body and adjusted style]
Signed-off-by: Luca Stauble <gnekoz@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

The png stuff in tight.c depends on code in tight.c that uses libjpeg
features. We could probably seperate that, but for now the dependency
for 'tight' goes:

PNG depends on JPEG depends on ZLIB.

This is reflected in Makefile.am now.

NB: Building tight.c with JPEG but without PNG is still possible,
    but nor the other way around.

Otherwise building breaks with older make versions. Happens on OS X
10.6 for instance.

The auth methods that employ Getcredential() will only be used if the client's
GetCredential callback is actually set.