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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2012-01-22 01:02:36 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2012-01-22 01:02:36 -0600
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+This is the K Display Manager (TDM) for KDE 3.4,
+the KDE replacement for the X Display Manager (XDM).
+
+Semi-official home page: http://devel-home.kde.org/~ossi/sw/tdm.html
+
+
+configure options that affect TDM
+---------------------------------
+
+--with-pam[=service]
+ Compile TDM (and other parts of tdebase) with PAM support. The default
+ service is "kde". PAM is automatically used if found.
+
+--with-tdm-pam=service
+ Override the PAM service used specifically by TDM. Depends on --with-pam.
+
+--with-shadow
+ Compile TDM (and other parts of tdebase) with shadow password support.
+ Shadow passwords are automatically used if found. This affects TDM only
+ if PAM is not used.
+
+--with-krb4[=path]
+ Compile TDM (and the LDAP KIO slave) with KTH Kerberos 4 support. Note
+ that this does not work with the Kerberos 4 compatibility layer found in
+ MIT Kerberos 5. This affects TDM only if PAM is not used.
+
+--with-afs
+ Compile TDM with AFS support. Depends on --with-krb4.
+
+--with-krb5auth[=path]
+--with-rpcauth
+ Compile TDM with Kerberos 5 resp. secure RPC support for X authorization
+ cookies. It's pretty pointless to enable this if you don't use an X server
+ that supports it.
+
+ If you want user authentication against a Kerberos realm, compile TDM with
+ PAM support and use the appropriate module.
+
+--without-xdmcp
+ Compile TDM without XDMCP support.
+
+--with-tdm-xconsole
+ Compile TDM with a builtin "xconsole" replacement in the greeter. I don't
+ consider this too useful, but SuSE wanted it, so it's there. ;)
+
+
+TDM's file system layout
+------------------------
+
+${kde_confdir} is usually ${prefix}/share/config
+${kde_datadir} is usually ${prefix}/share/apps
+The indented locations are envisioned for a configuration shared with GDM.
+
+${kde_confdir}/tdm/{tdmrc,Xservers,Xaccess,Xwilling,...}
+${kde_datadir}/tdm/sessions/*.desktop
+ /etc/X11/sessions/,/usr/share/xsessions/
+${kde_datadir}/tdm/pics/users/
+${kde_datadir}/tdm/pics/
+${kde_datadir}/tdm/faces/*.face{,.icon}
+ /usr/share/faces/
+/var/run/xauth/A*
+/var/run/xdmctl/xdmctl*
+/var/run/tdm.pid
+/var/lib/tdm/tdmsts
+<site-specific>/*.dmrc
+$HOME/.face{,.icon}
+$HOME/.dmrc
+
+
+How to setup TDM
+----------------
+
+TDM's config files are all located in ${kde_confdir}/tdm.
+"make install" will create a probably working configuration, either by
+deriving it from an already present TDM/XDM installation or by using
+defaults if no previous installation is found.
+
+You can change the configuration from the KDE Control Center. You will
+find the "Login Manager" module in the "System Administration" group.
+
+Have a look at README.pam in the tdebase top level directory if your
+system uses PAM.
+
+
+Configuring session types
+-------------------------
+
+The way session types are configured changed drastically in KDE 3.2.
+Session types are now represented by .desktop files in appropriate locations.
+The format of the .desktop files is (not yet) defined in the FreeDesktop.org
+desktop entry spec. Differences to "standard" .desktop files are:
+- the Type is fixed to XSession and can be omitted
+- the Encoding is fixed to UTF-8 and can be omitted
+- the Exec field will be passed to "eval exec" in a bourne shell; no macro
+ expansion is performed on it. "default", "custom" and "failsafe" are magic
+ constants that cause special actions.
+- Name, Comment, TryExec and Hidden are supported
+- the remaining keys have no meaning currently
+Session types are internally identified by filename (without extension);
+that's what will be saved to ~/.dmrc and what DESKTOP_SESSION will be set to.
+For every magic Exec constant a session type of the same name exists.
+
+Unless your system is configured differently already, you should create a
+directory ${kde_confdir}/tdm/sessions and add this to tdmrc:
+
+[X-*-Core]
+SessionsDirs=${kde_confdir}/tdm/sessions,${kde_datadir}/tdm/sessions
+
+(Note that you must use actual paths instead of variables, see the section
+about TDM's file system layout.)
+Do any changes only in the config directory - any changes in the data
+directory will be lost after the next KDE update.
+
+To override a session type, copy the .desktop file from the data dir to the
+config dir and edit it at will. Removing the shipped session types can be
+accomplished by "shadowing" them with .desktop files containing Hidden=true.
+For the magic session types no .desktop files exist by default, but TDM
+pretends they would, so you can override them like any other type.
+I guess you already know how to add a new session type by now. ;-)
+
+
+Running TDM from init
+---------------------
+
+NOTE, that this description applies to RedHat 5.x and must be adapted for
+other distributions/systems. Generally I'd advise _against_ starting TDM
+directly from init - better use a proper init script, possibly by slightly
+modifying the XDM init script shipped by your distribution.
+
+ Edit (as root) /etc/inittab.
+
+ Look for the line:
+
+ x:5:respawn:/usr/X11/bin/xdm -nodaemon
+
+ Replace it with:
+
+ x:5:respawn:/opt/kde/bin/tdm
+
+ This tells init(8) to respawn TDM, the KDE display manager, when
+ the system is in run level 5.
+ Note that TDM does not need the -nodaemon option.
+
+ To start TDM, either run (as root) /sbin/telinit 5 (to switch to
+ run level 5), or (this is risky! don't do it until you _know_ you
+ want the system to boot into this every time!) edit /etc/inittab
+ and change the line:
+
+ id:3:initdefault:
+
+ to
+
+ id:5:initdefault:
+
+ If you do the latter step, then every time your system boots
+ successfully it will go into run level 5 and run TDM,
+ presenting you the exceedingly cute KDE login screen.
+
+
+The command sockets
+-------------------
+
+This is a feature you can use to remote-control TDM. It's mostly intended
+for use by ksmserver and kdesktop from a running session, but other
+applications are possible as well.
+
+The sockets are UNIX domain sockets which live in subdirectories of the
+directory specified by FifoDir=. The subdir is the key to addressing and
+security; the sockets all have the file name "socket" and file permissions
+rw-rw-rw- (0666). This is because some systems don't care for the file
+permissions of the socket files.
+There are two types of sockets: the global one (dmctl) and the per-display
+ones (dmctl-<display>).
+The global one's subdir is owned by root, the subdirs of the per-display
+ones' are owned by the user currently owning the session (root or the
+logged in user). Group ownership of the subdirs can be set via FifoGroup=,
+otherwise it's root. The file permissions of the subdirs are rwxr-x--- (0750).
+
+The fields of a command are separated by tabs (\t), the fields of a list
+are separated by spaces, literal spaces in list fields are denoted by "\s".
+The command is terminated by a newline (\n).
+The same applies to replies. The reply on success is "ok", possibly followed
+by the requested information. The reply on error is an errno-style word (e.g.,
+"perm", "noent", etc.) followed by a longer explanation.
+
+Global commands:
+
+"login" display ("now"|"schedule") user password [session_arguments]
+ - login user at specified display. if "now" is specified, a possibly
+ running session is killed, otherwise the login is done after the
+ session exits.
+ session_arguments are printf-like escaped contents for .dmrc. Unlisted
+ keys will default to previously saved values.
+
+Per-display commands:
+
+"lock"
+ - The display is marked as locked. If the X-Server crashes in this state,
+ no auto-relogin will be performed even if the option is on.
+
+"unlock"
+ - Reverse the effect of "lock": re-enable auto-relogin.
+
+"suicide"
+ - The currently running session is forcibly terminated. No auto-relogin is
+ attempted, but a scheduled "login" command will be executed.
+
+Commands for all sockets:
+
+"caps"
+ - Returns a list this socket's capabilities:
+ "tdm" - identifies tdm, in case some other DM implements this protocol, too.
+ "list", "activate", "lock", "suicide", "login" - the respective command
+ is supported.
+ "bootoptions" - the "listbootoptions" command and the "=" option to
+ "shutdown" are supported.
+ "shutdown <list>" - "shutdown" is supported and allowed to the listed users
+ (comma-separated). "*" means all authenticated users.
+ "shutdown" - "shutdown" is supported and allowed to everybody.
+ "nuke <list>" - forced shutdown is allowed to the listed users.
+ "nuke" - forced shutdown is allowed to everybody.
+ "reserve <number>" - reserve displays are configured and <number> are
+ available at this time.
+
+"list" ["all"|"alllocal"]
+ - Return a list of running sessions. By default all active sessions are
+ listed. If "all" is specified, passive sessions are listed as well. If
+ "alllocal" is specified, passive sessions are listed as well, but all
+ incoming remote sessions are skipped.
+ Each session entry is a comma-separated tuple of:
+ - Display or TTY name
+ - VT name for local sessions
+ - Logged in user's name, empty for passive sessions and outgoing remote
+ sessions (local chooser mode)
+ - Session type or remote host for outgoing remote sessions, empty for
+ passive sessions
+ - A flag field:
+ - "t" for tty sessions
+ - "*" for the display belonging to the requesting socket
+ - "!" for sessions that cannot be killed by the requesting socket
+ - New flags might be added later
+ - New fields might be added later
+
+"reserve" [timeout in seconds]
+ - Start a reserve login screen. If nobody logs in within the specified amount
+ of time (one minute by default), the display is removed again. When the
+ session on the display exits, the display is removed, too.
+ - Permitted only on sockets of local displays and the global socket.
+
+"activate" (vt|display)
+ - Switch to a particular VT (virtual terminal). The VT may be specified
+ either directly (e.g., vt3) or by a display using it (e.g., :2).
+ - Permitted only on sockets of local displays and the global socket.
+
+"listbootoptions"
+ - List available boot options.
+ => "ok" list default current
+ default and current are indices into the list and are -1 if unset or
+ undeterminable.
+
+"shutdown" ("reboot"|"halt") ["="bootchoice] \
+ ("ask"|"trynow"|"forcenow"|"schedule"|\
+ start ("-1"|end ("force"|"forcemy"|"cancel")))
+ - Request a system shutdown, either a reboot or a halt/poweroff.
+ - An OS choice for the next boot may be specified from the list returned by
+ "listbootoptions".
+ - Shutdowns requested from per-display sockets are executed when the current
+ session on that display exits. Such a request may pop up a dialog asking
+ for confirmation and/or authentication.
+ - start is the time for which the shutdown is scheduled. If it starts with
+ a plus-sign, the current time is added. Zero means immediately.
+ - end is the latest time at which the shutdown should be performed if active
+ sessions are still running. If it starts with a plus-sign, the start time
+ is added. Minus one means wait infinitely. If end is through and active
+ sessions are still running, TDM can do one of the following:
+ * "cancel" - give up the shutdown.
+ * "force" - shut down nonetheless.
+ * "forcemy" - shut down nonetheless if all active sessions belong to the
+ requesting user. Only for per-display sockets.
+ - start and end are specified in seconds since the UNIX epoch.
+ - "trynow" is a synonym for "0 0 cancel", "forcenow" for "0 0 force" and
+ "schedule" for "0 -1".
+ - "ask" attempts an immediate shutdown and interacts with the user if active
+ sessions are still running. Only for per-display sockets.
+
+"shutdown" "cancel" ["local"|"global"]
+ - Cancel a scheduled shutdown. The global socket always cancels the currently
+ pending shutdown, while per-display sockets default to cancelling their
+ queued request.
+
+"shutdown" "status"
+ - Return a list with information about shutdowns.
+ The entries are comma-separated tuples of:
+ - ("global"|"local") - pending vs. queued shutdown. A local entry can be
+ returned only by a per-display socket.
+ - ("halt"|"reboot")
+ - start
+ - end
+ - ("ask"|"force"|"forcemy"|"cancel")
+ - Numeric user ID of the requesting user, -1 for the global socket.
+ - The next boot OS choice or "-" for none.
+ - New fields might be added later.
+
+There are two ways of using the sockets:
+- Connecting them directly. FifoDir is exported as $DM_CONTROL; the name
+ of per-display sockets can be derived from $DISPLAY.
+- By using the tdmctl command (e.g., from within a shell script).
+ Try "tdmctl -h" to find out more.
+
+Here is an example bash script "reboot into FreeBSD":
+
+if tdmctl | grep -q shutdown; then
+ IFS=$'\t'
+ set -- `tdmctl listbootoptions`
+ if [ "$1" = ok ]; then
+ fbsd=$(echo "$2" | tr ' ' '\n' | sed -ne 's,\\s, ,g;/freebsd/I{p;q}')
+ if [ -n "$fbsd" ]; then
+ tdmctl shutdown reboot "=$fbsd" ask > /dev/null
+ else
+ echo "FreeBSD boot unavailable."
+ fi
+ else
+ echo "Boot options unavailable."
+ fi
+else
+ echo "Cannot reboot system."
+fi
+
+
+"It doesn't work!!"
+-------------------
+
+More input! ;-)
+
+TDM accepts two command line options related to logging:
+
+ -debug <n>
+ <n> is a decimal or hexadecimal (prefix 0x) number.
+ The number is a bitfield, i.e., it is formed by summing up the
+ required values from this table:
+ 1 (0x1) - core debugging. Probably the most useful one.
+ 2 (0x2) - config reader debugging.
+ 4 (0x4) - greeter debugging.
+ 8 (0x8) - IPC debugging. This logs _all_ communication between the
+ core, the config reader and the greeter - including the
+ passwords you type, so edit the log before showing it to
+ somebody.
+ This attempts to synchronize the processes to interleave the
+ log messages optimally, but will probably fail unless you use
+ -debug 0x80 as well.
+ 16 (0x10) - wait after forking session sub-daemon.
+ 32 (0x20) - wait after starting config reader.
+ 64 (0x40) - wait after starting greeter.
+ The wait options are only useful if you need to attach a debugger
+ to a process, but it crashes before you are able to do so without
+ the delay. See below.
+ 128 (0x80) - don't use syslog for internally generated messages.
+ 256 (0x100) - core Xauth debugging.
+ 1024 (0x400) - run config reader and greeter through valgrind.
+ 2048 (0x800) - run config reader and greeter through strace.
+
+ Logs from "-debug 7" are usually a good start.
+
+ -logfile <file>
+ <file> is the file to log various messages to. The default log file is
+ /var/log/tdm.log. For internal reasons there is no option in tdmrc to
+ permanently specify the log file location. If you redirect TDM's
+ standard error output to a file, TDM will log there.
+ If TDM is configured to use syslog (and it _very_ probably is on any
+ modern system), all internally generated messages are logged to the
+ "daemon" facility. The log usually can be found in /var/log/debug.log
+ and /var/log/daemon.log; make sure that daemon.* is logged (look at
+ /etc/syslog.conf).
+ If you have problems logging in and your system uses PAM (also quite
+ probable on modern systems), the "auth" and "authpriv" syslog facilities
+ are interesting, too.
+
+Send me all the logs together with a detailed description of what you did
+and what happened. If your problem is related to a specific configuration,
+you should also attach a tar.gz archive of your TDM config directory.
+
+If I request a backtrace from you and TDM didn't create one yet via the
+usual drkonqi procedure, you'll have to do that yourself. The keyphrase
+is "attaching gdb". How exactly this is done depends on the part that
+crashes:
+- master daemon. Actually you should never need to attach to it, as
+ you can start it within the debugger already:
+ # gdb --args tdm -nodaemon -debug 7
+ (gdb) run
+- display subdaemon. Find (using ps) the process with a name like
+ "-:0" (where :0 is actually the display this process is for). This
+ process' PPID is the master daemon. Attach to it this way:
+ # gdb tdm <the PID you found>
+ (gdb) cont
+ If the subdaemon crashes before you can attach, add 16 to the debug flags
+ when you start TDM.
+- config reader. You will have to add 32 to the debug flags almost certainly.
+ The PPID will be the master daemon as well.
+ # gdb tdm_config $(pidof tdm_config)
+ (gdb) cont
+- greeter. If it's too fast, add 64 to -debug. The PPID will be the subdaemon.
+ # gdb tdm_greet $(pidof tdm_greet)
+ (gdb) cont
+ The simplification with "pidof" works only if you have only one display,
+ otherwise you have to find the PID manually (by using ps -fx).
+Once you got gdb attached to the offending process, do whatever is needed
+to make it crash (probably nothing, if you had to use a delay parameter).
+Once it crashed, gdb will tell you a signal name, like SIGSEGV - that's the
+first interesting part for me. Then you have to create the actual backtrace:
+ (gdb) bt
+The output of this command is interesting for me.
+I might request a backtrace even if nothing crashes, but instead hangs. In
+this case don't use "cont" after attaching, but use "bt" right away. If the
+process is already running, interrupt it with ctrl-c.
+For obvious reasons you have to run gdb on a different virtual terminal than
+the X server. To get there, press alt-ctrl-f1 and log in as root. To
+switch to the X server's vt, press alt-ctrl-f7 (the exact function key may
+be different on your system). You may also use a remote login from a
+second machine. In any case it is advantageous to have mouse support on the
+debugging console for copying the backtrace.
+Note that a backtrace is usually _much_ more useful if the binary contains
+debugging info, so you should install from source with the --enable-debug
+configure flag if at all possible.
+
+
+Random rambings and license information
+---------------------------------------
+
+Version 0.1 of TDM is copyright
+ Matthias Ettrich <ettrich@trolltech.com>
+All later versions copyright:
+ (C) 1997-2000 Steffen Hansen <hansen@kde.org>
+Since version 0.90 (KDE 2.1) copyright:
+ (C) 2000-2003 Oswald Buddenhagen <ossi@kde.org>
+
+The files in the backend directory are licensed under the X licence
+(see http://www.x.org/Downloads_terms.html for more info).
+The files in the kfrontend directory are licensed under the GNU GPL.
+
+Thanks to (in no particular order):
+Michael Bach Jensen and Torsten Rahn for drawing icons.
+Duncan Haldane for investigation of PAM issues.
+Stephan Kulow for helping with the autoconf stuff.
+Martin Baehr for intensive testing and writing the sample Xsession scripts.
+Harald Hoyer <Harald.Hoyer@redhat.de> for the (now obsoleted) chooser.
+SuSE for employing me (ossi) for three months to work on tdm.
+BasysKom for sponsoring my (ossi's) work on the conversation plugin stuff.
+... and _many_ others ...
+
+
+--
+Have fun with it (and feel free to comment),
+
+ Oswald Buddenhagen <ossi@kde.org>