barrier/notes

server						client
------						------
[accept]			<--		connect
challenge			-->		[encrypt]
[verify]			<--		response (encrypted challenge, client name)
hangup if invalid
query info			-->		
					<--		info (size)

---
enable heartbeat disconnection or remove heartbeat sending in client
  should either ship with it fully enabled or fully disabled
  possibly make it part of startup negotiation

---
sometimes jumping too far into secondary screen
  probably bogus delta (adding in center pixel coords into delta?)
  this is with an X primary and secondary
    don't know which matters but probably X primary

---
use automake
use doxygen

---
HTTP stuff
  no way to save config using HTTP
    should have a button or a page to force save of config
    or just save config every time it's changed
  should use authentication (at least basic)
  provide way to kill/restart server via HTTP
  provide way to query why locked to screen?
    handy for debugging at least

---
make generic input devices?
  replace mouse and keyboard with button and valuator devices?
  could fairly easily add new devices then
  valuators would have to come in groups that change together
    mouse position would be two ganged valuators
  key events are not simply button presses though
    they have a non-boolean character, shift state, and repeat count
    maybe another device type:  {data, state, repeat}

must handle on-the-fly addition/removal of devices
  USB allows hotplugging and we should support, say, an added joystick

must have device negotiation
  at very least it negotiates mouse/keyboard at start

---
should add clipboard data type format negotiation
  server sends permitted data type formats
  client responds with known formats in permitted list
  client must only send permitted formats
    server can discard non-permitted formats
  server must only send known, permitted formats to client
  formats are names of the form [a-zA-Z0-9_/]+
  server must be able to translate between all permitted formats
  example:  text formats:
    text/plain/CRLF  -- windows plain text
    text/plain/LF    -- unix plain text
    text/plain/CR    -- mac plain text
    text/rtf         -- rich text (does that require a particular newline?)
  or image formats:
    image/BMP
    image/RAW
    image/XPM

this will allow future versions to interoperate better.  it also
allows compatibility with versions that are identical except for
the support clipboard formats, obviating bumping up the protocol
version number.

---
hot keys
  should have keyboard shortcuts to jump to screens

---
win32:
  need icon
  provide taskbar icon
  provide control panel?

win32 dll:
  should make this as small as possible
    don't use standard libraries
    use custom _DllMainCRTStartup();  just call DllMain() from it.
    use /MERGE linker switch to merge sections

win32 service:
  need message table for proper event reporting

clean up c:\winnt\synergy.sgc

desktop switcher program failure when running synergy as service
  returns access denied from CreateDesktop()
  don't know why

---
bug with half-duplex keys
  win32 server sent num-lock to grace
  grace converts to half-duplex so only synthesizes key down
  now grace starts server and is locked to screen
  grace should ignore half duplex keys when seeing if locked to screen

---
bug in updating screens
  saw a goofy set of screens after update
  i think the config was similar to:
    A B
    C
    D E

---
should switch to user nobody (or something similar) if running as root
  for security reasons
  will make it impossible to overwrite /etc/synergy.conf
    if that file is only root writable (as it should be)

---
Xsetup file may have to kill previous synergy
  or synergy should exit if there's already a synergy running

---
not handling international characters

---
xscreensaver won't start if pointer on secondary screen
  unless using MIT or SGI screen saver extensions
  otherwise it cannot know when to stop the screen saver
    cos it can't grab mouse and keyboard
---
all screensavers hidden when showing win32 screensaver lock window
  win32 kills the screen saver and shows the lock window
  synergy thinks the screen saver is dead (cos the process is)
    deactivates secondary screen screen savers
  user is constrained to locked display, though
  also, we don't detect screen saver restarting if user doesn't unlock screen

---
not distinguishing between caps lock and shift lock
  In Caps Lock mode, the alphabetic keys send their uppercase (shifted) char-
  acter when pressed alone. For Caps Lock mode, pressing and releasing the
  lock key turns on the mode and pressing and releasing the lock key again
  turns off the mode. In Shift Lock mode, all keys on the main keypad send
  their shifted character when pressed alone. For Shift Lock mode, pressing
  and releasing the Lock key turns on the mode, and pressing and releasing
  either the Lock or the Shift key turns off the mode.

---
currently sending all clipboards to all clients
  some clients may not need all clipboards
  add filtering mechanism
    setup is probably part of clipboard (format) negotiation

---
not handling large motif selections
  there must be a limit because properties can only be so big
  don't know protocol for transfer, though

---
need timeout on CXWindowsClipboard::CReply objects
  should flush replies that are too old
  assumption is that requestor is broken

---
inconsistencies
  exceptions
    using getWhat() in some places to return a code, elsewhere returns message
  references/pointers
    should use pointers for any in/out parameter
      but using references in some places

---
avoid fullscreen transparent window on win32
  using CBT hook to discard activation/focus messages
    but it's not being called when we lose keyboard input
  also, we sometimes don't get the keyboard input to start with

---
keyboard hook problems (win32)
  now passing keyboard events through in most cases
    this fixes problem on isabel where toggle lights don't toggle
    and num-lock behaved incorrectly (generated wrong keys).
    seems the DefWindowProc() needed to process the keys
  unfortunately, keys sometimes leak into wrong app.  seems related
    to times when we don't get the keyboard input.  key events are
    not delivered to app on primary until cursor returns to primary.
    no idea how that's possible.
  current have some code to check active window and reset it in
    keyboard hook.  that code doesn't work.
  seem to be having problems with windows key now, too.  looks like
    a down is sent but not the corresponding up so secondary system
    thinks the key is always down.

---
try to determine X11 keyboard quirks automatically
  in particular, set the half-duplex flags
  maybe KBD extension will help determine this

---
key events sent to console on win me (95/98?) are very slow
  1/4 to 1/2 second delay before key up is processed
  key up log message is also delayed
    console causing a system-wide delay?

---
adjust thread priorities on win32
  maybe remove changes altogether
  currently isabel starts single-stepping mouse when dragging window
    sometimes it goes normal speed but it's mostly very slow
    even a very high priority doesn't seem to help
      haven't tried real-time priority
  a very high priority on client fixes delay when typeing into console
  is it the output console causing the slowness?
  mouse motion compression seems to handle slow dragging on grace
    pretty sure nothing else was wrong on grace
    maybe same problem and solution on win32

---
results:
  X primary
    ctrl+alt+keypad_add, ctrl+alt_keypad_minus -> eaten by primary X server
    ctrl+alt+backspace probably eaten by primary X server if so configured
    ctrl+alt+delete probably eaten locally
      probably underneath primary X server too
  Win32 desktop -> X laptop
    eaten global hot keys:
      ctrl+alt+delete -> task manager (or logon or reboot)
      alt+[shift+]tab -> cycle through tasks
      alt+[shift+]esc -> cycle windows
      ctrl+esc -> start menu
      windows+R -> run dialog
      windows+M -> minimize all
      windows+shift+M -> undo minimize all
      windows+F1 -> help
      windows+E -> explorer
      windows+F -> find files
      windows+ctrl+F -> find computer
      windows+tab -> cycle through taskbar buttons
      windows+break -> system properties
    not eaten:
      alt+space -> system menu
      shift+F10 -> context menu
      app key -> context menu
    misc:
      accessibility shortcuts: not eaten but dialogs appear anyway
  X laptop -> Win32 desktop
    check:
      shift+tab -> okay
      alt+[shift+]tab -> okay
      alt+[shift+]esc -> okay
      ctrl+esc -> start menu -> okay
      ctrl+esc, esc, shift+F10 -> toolbar context menu -> okay
      F10 -> activate menu in explorer -> okay
      shift+F10 -> context menu -> okay
      alt+space -> context menu -> okay
      alt+hyphen -> MDI window menu -> okay
      alt+letter -> open corresponding menu -> okay
      alt+F6 -> switch between windows in single program -> okay
      shift+insert CD-ROM -> bypass auto-run
    check accessibility shortcuts -> does not work
    check accessibility features
      sticky keys -> no
      filter keys -> no
      toggle keys -> no
      mouse keys -> no
      high contrast -> no
  X desktop -> win32
    check:
      shift+tab
      windows+R -> run dialog
      windows+M -> minimize all
      windows+shift+M -> minimize all
      windows+F1 -> help
      windows+E -> explorer
      windows+F -> find files
      windows+ctrl+F -> find computer
      windows+tab -> cycle through taskbar buttons
      windows+break -> system properties
      app key -> context menu
  Win32 -> Win32
    alt+F6 -> eaten (isabel to audrey, but not audrey to isabel)
    check accessibility shortcuts work on secondary
    check accessibility features work on secondary

---
Accessibility Shortcuts

   Key                                Result
   -------------------------------------------------------------------
   Tap SHIFT 5 times                  Toggles StickyKeys on and off.

   Press down and hold the right      Toggles FilterKeys on and off.
   SHIFT key for 8 seconds

   Press down and hold the NUM LOCK   Toggles ToggleKeys on and off.
   key for 5 seconds

   Left ALT+left SHIFT+NUM LOCK       Toggles MouseKeys on and off.

   Left ALT+left SHIFT+PRINT SCREEN   Toggles High Contrast on and off.

---
disable ctrl+alt+del info:
  SystemParametersInfo(SPI_SETSCREENSAVERRUNNING, TRUE, &dummy, 0)
    fools system into thinking screen saver is running
    that disables ctrl+alt+del, alt+tab, ctrl+esc
    dunno if keystrokes are queued
    may be limited to win 95/98/me
  win nt sp 3 and above:
    low-level keyboard hook is called before ctrl+esc, alt+tab, alt+esc
    use that to capture and disable
    seems that low-level hook is notified of ctrl+alt+del but can't stop it
  win nt sp 2 and below
    ctrl+esc can be disabled by replacing task manager (dunno how)
    RegisterHotKey() can be used to catch alt+tab and alt+esc
      only while app is running, of course
  win nt
    keyboard filter driver can capture keys (see win NT DDK)
  http://216.239.51.100/search?q=cache:q-f03UHhFMMC:www.thescarms.com/VBasic/StopReBoot.asp+alt%2Btab+disable&hl=en
    some info on changing keyboard scan code mapping
    can be used to disable keys but looks like reboot is required

---
Q179905
  suggestion for bypassing hook code when called by debugger.
  may prevent system from getting locked up when debugging.

---
win32 rel notes:
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\NoInteractiveServices
    can prevent an interactive service from running interactively.
    how can we tell if we're not running interactively?
    even if not interactive we can use MessageBox() to alert user
      use MB_SERVICE_NOTIFICATION flag
      must use a separate thread in initialization if called from handler
      must close dialog if CTRL_LOGOFF_EVENT is received
        see SetConsoleCtrlHandler() and CLog (which uses it)
    maybe possible to get around NoInteractiveServices
      modify DACLs on windows station/desktops to impersonate logged on user
      see "Interacting with the User by a Win32 Service"

---
unix release notes:
  restarting fails to connect until a user logs in:
    Xlib: no protocol specified
    this is caused by login manager
      all clients are rejected, except those started by manager itself
    workaround is to have synergy started by login manager
      should then use --no-restart, though that's not necessary
    affects client and server
  cannot switch screens on login screen:
    xdm,kdm grab keyboard for duration of login screen
    synergy cannot switch unless it can grab keyboard
    gdm doesn't appear to grab keyboard or mouse for duration
    affects server, only

=== feedback ===
send all toggle states instead of (individual) toggle ups/downs (gspencer)
  Actually, Teleffect already does that too, but what I meant was that
  each time the state of a "toggle" key (caps lock, scroll lock, num lock)
  changes on the master, I think it should force the client to take on
  that state, instead of just toggling on the client.  That way when Word
  (on the client) helpfullly turns off the caps lock, it doesn't get
  toggled back on when I turn off the caps lock on the master.  Ideally,
  it would just notice that Word turned off the caps lock on the client
  and turn it off on the master (and all other clients) too, but I think
  that's probably too complicated to implement.

double clicking NT binaries fails (liz)
  add note to README or use separate binaries for services.  client
  would also need a dialog to query options.  server would probably
  need one too.  use dialogs if there are no command line args.

how to exit (liz)
  no good way to exit on windows

win32 console disappears too quickly (liz)
  maybe show a message box if exiting to due an error

better support for reloading configuration (liz)
  use SIGHUP on unix
  use an app message on win32
    provide access through a control panel or taskbar icon

non-functional on ctrl+alt+del screen in win2k (kurt)
  i suppose it must be when win2k is the client.  mouse input wasn't
  working.  keyboard probably didn't work either.

gspencer:
  OK, I've narrowed it down a little -- it seems to happen if you have any
  key down (I tried the shift key and the letter 's' key) when you cross
  over from master to client, which would make me suspect the "capture"
  code, since if you have a key down you aren't supposed to be able to
  cross over...


== fixed? ===
dragging windows is too slow
  grace (as client) exhibits this
    dunno if it happens with audrey2 as the client
  liz says her windows laptop does it too
  also closing/iconifying has a delay
  dragging multiple files also sluggish

liz seems to still be seeing sluggish cursor updates

---
automake stuff
  rebuild:
    * 'autoheader'    - creates config.h.in
    * 'touch NEWS README AUTHORS ChangeLog'
    * 'touch stamp-h'
    * aclocal - adds aclocal.m4 to directory. Defines some m4 macros used by the auto tools.
    * 'autoconf '- creates configure from configure.in
    * 'automake' - Creates Makefile.in from Makefile.am
    * './configure' - creates Makefile from Makefile.in
    * 'make'

  funky functions:
    snprintf -- ick!
      some return negative value -- no problem
      some return truncated length -- uh oh
      some return buffer length without truncation -- huh?
      some actually overrun the buffer -- must not build on those!

  use AC_LIBOBJ(function) for missing/broken functions
    adds function.c to build
    must add @LIBOBJS@ to *_LIBADD
  or AC_REPLACE_FUNCS(function ...)
    automatically calls AC_LIBOBJ for missing functions
  use AC_CHECK_FUNC or AC_CHECK_FUNCS to detect missing functions
    use AC_CHECK_LIB first if function not in std C lib

  maybe AC_CHECK_TYPE for size_t and ssize_t

replace sys/time.h with:
#if TIME_WITH_SYS_TIME
#	include <sys/time.h>
#	include <time.h>
#else
#	if HAVE_SYS_TIME_H
#		include <sys/time.h>
#	else
#		include <time.h>
#	endif
#endif

  what does `make install' do?

  check in derived files?
    aclocal.m4
    config.h.in
    configure

used library functions:
	accept
	bind
	chdir
	close
	connect
	dup
	fork
	fprintf
	getenv
	gethostbyaddr
	gethostbyname
	gethostname
	getpeername
	getprotobyname
	getprotobynumber
	getservbyname
	getservbyport
	getsockname
	getsockopt
	gettimeofday
	inet_addr
	inet_ntoa
	ioctl
	listen
	memcpy
	memmove
	memset
	nanosleep
	open
	openlog
	poll
	read
	recv
	recvfrom
	send
	sendto
	setsid
	setsockopt
	shutdown
	sigaction
	sigaddset
	sigemptyset
	socket
	sprintf
	strcat
	strcmp
	strerror
	strrchr
	syslog
	umask
	vsnprintf
	write

included files
	#include <arpa/inet.h>
	#include <fcntl.h>
	#include <pthread.h>
	#include <pwd.h>
	#include <shlobj.h>
	#include <signal.h>
	#include <sys/ioctl.h>
	#include <sys/stat.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <sys/wait.h>
	#include <syslog.h>
	#include <unistd.h>
these put stuff in std::.  replace with .h versions or use std::?
      3 #include <cctype>
      3 #include <cerrno>
      1 #include <clocale>
      3 #include <cstdio>
      4 #include <cstdlib>
     12 #include <cstring>
      1 #include <ctime>

can we use AC_REPLACE_FUNCS and only build the missing function files
in a single directory.  do we have to have a separate configure.in
script to do that?