path: root/mdk-stage1/rp-pppoe/gui/tkpppoe.in

#!/bin/sh
# -*-Mode: TCL;-*-

#--------------------------------------------------------------
#   tkpppoe
#
#   A graphical front-end for configuring and using rp-pppoe.
#
#   Copyright (C) 2001 by Roaring Penguin Software Inc.
#   This file may be distributed under the terms of the GNU General Public
#   License, Version 2, or (at your option) any later version.
#
#   The "Roaring Penguin" logo is a trademark of Roaring Penguin Software Inc.
#
#   http://www.roaringpenguin.com
#
#--------------------------------------------------------------

# $Id$

# the next line restarts using wish \
umask 022; \
exec wish "$0" "$@" || clear; echo "*****"; echo "Cannot find 'wish' -- you need Tcl/Tk installed to run this program"; exit 1

# Set app name
tk appname TkPPPoE

# Set this to one if you want to allow multiple instances of TkPPPoE
set AllowMultipleInstances 0

# Check for other instances
if {"[tk appname]" != "TkPPPoE"} {
    # Must be another instance running...
    if {!$AllowMultipleInstances} {
	send TkPPPoE AnotherInstance
	exit 0
    }
}

# Location of config directory
set ConfigDir /etc/ppp/rp-pppoe-gui

# Are we running as root?
set Admin 0

# Location of connection info file
set ConnectionInfoFile [file join $ConfigDir connection-info]

# Location of password file
set PasswordFile [file join $ConfigDir passwd]

# Location of "already run" file
set AlreadyRunFile [file join $ConfigDir gui-already-run]

# Connection information
set ConnectionInfo {}

# Connection options
set OPTS(nonroot) 0
set OPTS(sync) 1

# Location of wrapper
set Wrapper "@WRAPPER@"

# Timer token for UpdateConnectionState
set UpdateToken {}

# Update interval in milliseconds
set UpdateInterval 500

# Packet counters for signalling activity
set Packets(in) 0
set Packets(out) 0
set Bytes(in) 0
set Bytes(out) 0
set MeasureTime 0

# Set up some options to make it look better
option add *Button.borderWidth 1
option add *Button.Pad 1
option add *Menubutton.borderWidth 1
option add *Menubutton.Pad 1
option add *Entry.Background white

# Array holding help strings for windows
array set HelpData {}

bind HelpWin <Enter> "HelpWindowEntered %W"
bind HelpWin <Leave> "HelpWindowLeft %W"

proc AnotherInstance {} {
    wm deiconify .
    raise .
}

#***********************************************************************
# %PROCEDURE: HelpWindowEntered
# %ARGUMENTS:
#  w -- window
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Looks for procedure in HelpData; evals it if found.
#***********************************************************************
proc HelpWindowEntered { w } {
    global HelpData
    if {[info exists HelpData($w)]} {
	set cmd "$HelpData($w) Enter"
	uplevel #0 $cmd
    }
}

#***********************************************************************
# %PROCEDURE: HelpWindowLeft
# %ARGUMENTS:
#  w -- window
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Looks for procedure in HelpData; evals it if found.
#***********************************************************************
proc HelpWindowLeft { w } {
    global HelpData
    if {[info exists HelpData($w)]} {
	set cmd "$HelpData($w) Leave"
	uplevel #0 $cmd
    }
}

#***********************************************************************
# %PROCEDURE: RegisterHelpWindow
# %ARGUMENTS:
#  w -- window we need help about
#  helptext -- the help text
#  win -- window in which to put help messages
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Sets things up so help text appears in "$win" when mouse enters "$w"
#***********************************************************************
proc RegisterHelpWindow {w helptext win} {
    global HelpData
    set tags [bindtags $w]
    if {[lsearch -exact $tags HelpWin] < 0} {
	lappend tags HelpWin
	bindtags $w $tags
    }
    set HelpData($w) [list HelpInTextWin $helptext $win]
}

#***********************************************************************
# %PROCEDURE: HelpInTextWin
# %ARGUMENTS:
#  text -- help text
#  tw -- window in which to write text
#  what -- one of "Enter" or "Leave"
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Clears out $tw; if $what is "Enter", puts $text in $tw.
#***********************************************************************
proc HelpInTextWin {text tw what} {
    $tw configure -state normal
    $tw delete 1.0 end
    if {"$what" == "Enter"} {
	$tw insert end $text
    }
    $tw configure -state disabled
}


#***********************************************************************
# %PROCEDURE: drawLogo
# %ARGUMENTS:
#  c -- canvas to draw logo in
#  bg -- background color of canvas
#  pencolor -- color of the word "Penguin"
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Draws Roaring Penguin logo in a Tcl canvas
#***********************************************************************
proc drawLogo { c bg {pengcolor #6699cc} } {
    $c create polygon 372.249 5.182 361.23 5.519 \
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	    324.689 40.036 334.583 28.905 348.3 18.674 372.249 \
	    5.182 -fill #000000 -outline {} -width 1 -tags logo

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	    48.131 353.135 45.995 359.768 41.048 342.679 43.184 \
	    324.689 40.036 334.583 28.905 348.3 18.674 372.249 \
	    5.182  -tags logo

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	    286.687 157.192 298.605 109.632 -fill #ffffff \
	    -outline {} -width 1  -tags logo

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	    157.192 298.605 109.632  -tags logo

    $c create polygon 312.546 30.592 315.132 35.876 \
	    310.747 39.586 308.161 34.414 312.546 30.592 -fill \
	    #ffffff -outline {} -width 1  -tags logo

    $c create line 312.546 30.592 315.132 35.876 \
	    310.747 39.586 308.161 34.414 312.546 30.592  -tags logo

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	    233.871 327.388 185.75 335.033 139.989 335.82 96.253 \
	    328.624 54.427 -fill #ffffff -outline {} -width 1  -tags logo

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	    328.624 54.427  -tags logo

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	    53.837 183.051 53.837 183.501 53.837 185.412 -fill \
	    $pengcolor -outline {} -width 1  -tags logo

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	    42.594 222.853 -fill $pengcolor -outline {} -width 1  -tags logo

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	    279.294 157.838 279.969 159.3 280.981 160.199 \
	    280.643 160.649 279.969 160.986 279.294 161.211 \
	    278.17 161.211 269.175 -fill $bg -outline {} -width \
	    1  -tags logo

    $c create polygon 224.848 273.448 223.836 \
	    273.448 222.825 273.56 222.15 273.673 221.588 \
	    273.897 220.913 274.684 220.688 275.809 220.688 \
	    278.17 220.801 279.294 221.138 279.969 221.7 280.643 \
	    222.487 280.981 223.612 280.643 224.399 279.969 \
	    224.736 279.294 224.848 278.17 224.848 273.448 -fill \
	    $bg -outline {} -width 1  -tags logo

    $c create polygon 253.969 269.175 253.744 \
	    267.826 253.406 266.927 252.732 266.477 251.607 \
	    266.364 250.708 266.477 250.146 266.927 249.696 \
	    269.175 249.696 272.548 253.969 272.548 253.969 \
	    269.175 -fill $bg -outline {} -width 1  -tags logo

}

#***********************************************************************
# %PROCEDURE: LoadConnectionInfo
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Loads the connection information into the global ConnectionInfo variable
#***********************************************************************
proc LoadConnectionInfo {} {
    global ConnectionInfoFile ConnectionInfo PasswordFile
    set ConnectionInfo {}
    if {![file exists $ConnectionInfoFile]} {
	return
    }
    set problem [catch {
	set fp [open $ConnectionInfoFile "r"]
	while {1} {
	    if {[gets $fp line] < 0} {
		break
	    }
	    set line [string trim $line]
	    if {[string match "#*" $line]} {
		continue
	    }
	    if {"$line" == ""} {
		continue
	    }
	    set ConnectionInfo $line
	    break
	}
	close $fp
    } err]
    if {$problem} {
	tk_dialog .err Error "Error loading configuration file: $err" error 0 OK
    }
    # Try loading and merging passwords if the password file is readable
    if {![file readable $PasswordFile]} {
	return
    }

    set fp [open $PasswordFile "r"]
    while {1} {
	if {[gets $fp line] < 0} {
	    break
	}
	set line [string trim $line]
	if {[string match "#*" $line]} {
	    continue
	}
	if {"$line" == ""} {
	    continue
	}
	set passwords $line
	break
    }
    close $fp

    # Merge passwords
    foreach thing $passwords {
	set name [value $thing ConnectionName]
	set password [value $thing Password]
	set conn [GetConnection $name]
	if {"$conn" != ""} {
	    lappend conn Password $password
	    ReplaceConnection $conn
	}
    }
}

#***********************************************************************
# %PROCEDURE: GetConnection
# %ARGUMENTS:
#  name -- name of connection
# %RETURNS:
#  key/value pair listing connection configuration, or "" if not found.
#***********************************************************************
proc GetConnection { name } {
    global ConnectionInfo
    foreach thing $ConnectionInfo {
	if {[value $thing ConnectionName] == "$name"} {
	    return $thing
	}
    }
    return ""
}
    

#***********************************************************************
# %PROCEDURE: DeleteConnection
# %ARGUMENTS:
#  name -- name of connection
# %RETURNS:
#  Nothing, but deletes connection named "$name"
#***********************************************************************
proc DeleteConnection { name } {
    global ConnectionInfo ConfigDir
    set newInfo {}
    set found 0
    foreach thing $ConnectionInfo {
	if {[value $thing ConnectionName] == "$name"} {
	    set found 1
	} else {
	    lappend newInfo $thing
	}
    }
    if {!$found} {
	return
    }
    set ConnectionInfo $newInfo
    SaveConnectionInfo

    # Delete the config file
    set fname [file join $ConfigDir conf.$name]
    catch { file delete $fname }

    BuildConnectionMenu
    if {[GetCurrentConnection] == $name} {
	if {[llength $ConnectionInfo] == 0} {
	    SwitchConnection ""
	} else {
	    set name [value [lindex $ConnectionInfo 0] ConnectionName]
	    SwitchConnection $name
	}
    }
}

#***********************************************************************
# %PROCEDURE: ReplaceConnection
# %ARGUMENTS:
#  conn -- new name/value pairs
# %RETURNS:
#  Nothing, but replaces connection in ConnectionInfo.  If no such
#  connection exists, appends new connection.
#***********************************************************************
proc ReplaceConnection { conn } {
    global ConnectionInfo
    set name [value $conn ConnectionName]
    set newInfo {}
    set found 0
    foreach thing $ConnectionInfo {
	if {[value $thing ConnectionName] == "$name"} {
	    lappend newInfo $conn
	    set found 1
	} else {
	    lappend newInfo $thing
	}
    }
    if {!$found} {
	lappend newInfo $conn
    }
    set ConnectionInfo $newInfo
}

proc DeletePPPoEConnection {} {
    set conn [GetCurrentConnection]
    if {"$conn" == ""} {
	return
    }
    set ans [tk_dialog .confirm "Confirm Deletion - RP-PPPoE" "Are you sure you wish to delete the connection `$conn'?" warning 0 No Yes]
    if {$ans} {
	DeleteConnection $conn
    }
}

#***********************************************************************
# %PROCEDURE: CreateMainDialog
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Creates the main window
#***********************************************************************
proc CreateMainDialog {} {
    global ConnectionInfoFile
    global ConnectionInfo
    global Admin
    wm title . "RP-PPPoE"
    wm iconname . "PPPoE"
    frame .f1
    label .l1 -text "Connection: "
    menubutton .m1 -text "" -indicatoron 1 -menu .m1.menu -relief raised
    menu .m1.menu -tearoff 0
    pack .l1 .m1 -in .f1 -side left -expand 0 -fill x
    canvas .c -width 40 -height 20
    pack .c -in .f1 -side left -expand 0 -fill none

    # Draw the LED's
    .c create rectangle 10 1 30 8 -outline "#808080" -fill "#A0A0A0" -tags xmitrect
    .c create rectangle 10 10 30 18 -outline "#808080" -fill "#A0A0A0" -tags recvrect

    frame .buttons
    button .start -text "Start" -command "StartPPPoEConnection"
    button .stop -text "Stop" -command "StopPPPoEConnection"
    button .exit -text "Exit" -command "exit"
    canvas .graph -width 1 -height 1
    if {[file writable $ConnectionInfoFile]} {
	set Admin 1
	pack .f1 -side top -expand 1 -fill both
	pack .buttons -side top -expand 0 -fill x
	button .delete -text "Delete" -command "DeletePPPoEConnection"
	button .new -text "New Connection..." -command "NewPPPoEConnection"
	button .props -text "Properties..." -command "EditConnectionProps"
	pack .graph -in .f1 -side left -expand 1 -fill both
	pack .start .stop .delete .props .new .exit -in .buttons -side left -expand 0 -fill none
    } else {
	set Admin 0
	pack .f1 -side top -expand 0 -fill x
	pack .buttons -side top -expand 1 -fill both
	pack .start .stop .exit -in .buttons -side left -expand 0 -fill none
	pack .graph -in .buttons -side left -expand 1 -fill both
    }

    LoadConnectionInfo
    BuildConnectionMenu
    # If no connections exist, pop up new connection dialog
    if {[llength $ConnectionInfo] == 0} {
	SwitchConnection ""
	if {$Admin} {
	    update idletasks
	    NewPPPoEConnection
	} else {
	    tk_dialog .note Note "Note: There are no connections defined.  You must run this program as root to define connections" warning 0 OK
	}
    } else {
	set con [lindex $ConnectionInfo 0]
	set name [value $con ConnectionName]
	SwitchConnection $name
    }
}

#***********************************************************************
# %PROCEDURE: GetCurrentConnection
# %ARGUMENTS:
#  None
# %RETURNS:
#  The name of the current connection in the GUI.
#***********************************************************************
proc GetCurrentConnection {} {
    .m1 cget -text
}

#***********************************************************************
# %PROCEDURE: value
# %ARGUMENTS:
#  lst -- a list of key/value pairs
#  key -- key we're looking for
# %RETURNS:
#  value corresponding to $key, or "" if not found.
#***********************************************************************
proc value { lst key } {
    set idx [lsearch -exact $lst $key]
    if {$idx >= 0} {
	return [lindex $lst [expr $idx+1]]
    }
    return ""
}

#***********************************************************************
# %PROCEDURE: SwitchConnection
# %ARGUMENTS:
#  name -- new connection name
# %DESCRIPTION:
#  Makes $name the active connection
#***********************************************************************
proc SwitchConnection { name } {
    .m1 configure -text $name
    SetButtonStates
    UpdateConnectionState 0
}

#***********************************************************************
# %PROCEDURE: EditConnectionProps
# %ARGUMENTS:
#  None
# %DESCRIPTION:
#  Pops up edit window for current connection
#***********************************************************************
proc EditConnectionProps {} {
    global ConnectionInfo
    set conn [GetCurrentConnection]
    NewPPPoEConnection $conn
}

#***********************************************************************
# %PROCEDURE: FillConnectionGui
# %ARGUMENTS:
#  w -- connection property GUI
#  name -- name of connection
# %DESCRIPTION:
#  Fills GUI with values corresponding to $name.
#***********************************************************************
proc FillConnectionGui { w name } {
    global ConnectionInfo
    set found [GetConnection $name]
    if {"$found" != ""} {
	ListToSetupGui $w $found
    }
}
    
#***********************************************************************
# %PROCEDURE: BuildConnectionMenu
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Builds the connection menu
#***********************************************************************
proc BuildConnectionMenu {} {
    global ConnectionInfo
    .m1.menu delete 0 end
    foreach connection $ConnectionInfo {
	set name [value $connection ConnectionName]
	.m1.menu add command -label $name -command [list SwitchConnection $name]
    }
    .m1.menu add separator
    .m1.menu add command -label "User's Manual" -command Help
}

#***********************************************************************
# %PROCEDURE: SetButtonStates
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Enables or disables buttons, as appropriate
#***********************************************************************
proc SetButtonStates {} {
    global Admin
    set conn [GetCurrentConnection]
    if {"$conn" == ""} {
	.start configure -state disabled
	.stop configure -state disabled
	catch {
	    .delete configure -state disabled
	    .props configure -state disabled
	    .new configure -state normal
	}
    } else {
	foreach {startstop updown interface} [GetConnectionStatus $conn] {break}
	if {"$startstop" == "started"} {
	    .start configure -state disabled
	    .stop configure -state normal
	} else {
	    .start configure -state normal
	    .stop configure -state disabled
	}
	catch {
	    .delete configure -state normal
	    .props configure -state normal
	    .new configure -state normal
	}
	if {!$Admin} {
	    set ok [value [GetConnection $conn] NonrootOK]
	    if {!$ok} {
		.start configure -state disabled
		.stop configure -state disabled
	    }
	}
    }
}

#***********************************************************************
# %PROCEDURE: GetEthernetInterfaces
# %ARGUMENTS:
#  None
# %RETURNS:
#  A list of Ethernet interfaces
#***********************************************************************
proc GetEthernetInterfaces {} {
    set ifs {}
    set fp [open "|/sbin/ifconfig" "r"]
    while {[gets $fp line] >= 0} {
	if {[regexp {^eth[0-9]+} $line eth]} {
	    lappend ifs $eth
	}
    }
    return $ifs
}

#***********************************************************************
# %PROCEDURE: StartPPPoEConnection
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Starts currently-selected PPPoE connection.
#***********************************************************************
proc StartPPPoEConnection {} {
    global Wrapper
    global StartState
    global UpdateToken

    set conn [GetCurrentConnection]
    if {"$conn" == ""} {
	return
    }

    if {"$UpdateToken" != ""} {
	after cancel $UpdateToken
	set UpdateToken ""
    }

    catch { unset StartState }
    set StartState(chars) ""
    set StartState(status) ""
    set StartState(msg) ""
    set StartState(flip) 0

    set fp [open "|$Wrapper start $conn" "r"]

    # Set fileevent
    fileevent $fp readable [list StartFPReadable $fp]

    LockGui $fp
    vwait StartState(status)
    UnlockGui

    if {$StartState(status) == "failed"} {
	tk_dialog .err Error "Error starting connection: $StartState(msg)" error 0 OK
    }
    SetButtonStates
    UpdateConnectionState 0
}

proc LockGui { fp } {
    .start configure -state disabled
    .stop configure -state normal -command [list AbortConnection $fp]
    .exit configure -state disabled
    .m1 configure -state disabled
    grab set .stop
}

proc UnlockGui {} {
    .start configure -state normal
    .stop configure -state disabled -command StopPPPoEConnection
    .exit configure -state normal
    .m1 configure -state normal
    grab release .stop
}

proc AbortConnection { fp } {
    global StartState
    catch { StopPPPoEConnection }
    catch { close $fp }
    set StartState(msg) "Connection aborted by user"
    set StartState(status) "failed"
}
    
#***********************************************************************
# %PROCEDURE: StartFPReadable
# %ARGUMENTS:
#  fp -- file handle
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Called when the "adsl-start" file handle is readable.
#***********************************************************************
proc StartFPReadable { fp } {
    global StartState
    set char [read $fp 1]
    if {$char == ""} {
	set uhoh [catch {close $fp} err]
	if {$uhoh} {
	    set StartState(status) "failed"
	    set StartState(msg) $err
	} else {
	    set StartState(status) "succeeded"
	}
	return
    }
    append StartState(chars) $char
    if {$StartState(flip)} {
	ConnectionStateDown
    } else {
	ConnectionStateOff
    }
    set StartState(flip) [expr 1 - $StartState(flip)]
}

#***********************************************************************
# %PROCEDURE: StopPPPoEConnection
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Stops currently-selected PPPoE connection.
#***********************************************************************
proc StopPPPoEConnection {} {
    global Wrapper
    set conn [GetCurrentConnection]
    if {"$conn" == ""} {
	return
    }
    set fp [open "|$Wrapper stop $conn" "r"]
    while {1} {
	set char [read $fp 1]
	if {"$char" == ""} {
	    break;
	}
    }
    set uhoh [catch {close $fp} err]
    if {$uhoh} {
	# Ignore a common error
	if {![string match "*appears to have died*" $err]} {
	    tk_dialog .err Error "Error stopping connection: $err" error 0 OK
	}
    }
    SetButtonStates
    UpdateConnectionState 0
}

#***********************************************************************
# %PROCEDURE: NewPPPoEConnection
# %ARGUMENTS:
#  name -- if supplied, we're editing the existing connection "name"
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Creates a new PPPoE connection
#***********************************************************************
proc NewPPPoEConnection {{name ""}} {
    set w .newcon
    if {[winfo exists $w]} {
	wm deiconify $w
	raise $w
	return
    }

    toplevel $w
    if {"$name" == ""} {
	wm title $w "New Connection - RP-PPPoE"
	wm iconname $w "New Connection"
    } else {
	wm title $w "Edit Connection - RP-PPPoE"
	wm iconname $w "Edit Connection"
    }
    wm withdraw $w

    tabnotebook_create $w.tn
    set basic [tabnotebook_page $w.tn "Basic"]
    set interface [tabnotebook_page $w.tn "NIC and DNS"]
    set opts [tabnotebook_page $w.tn "Options"]
    set advanced [tabnotebook_page $w.tn "Advanced"]

    # ----------- BASIC PAGE -------------
    label $w.lconName -text "Connection Name: " -anchor e
    if {"$name" != ""} {
	label $w.conName -text $name -anchor w
    } else {
	entry $w.conName -width 15
	RegisterHelpWindow $w.lconName "Enter a name for this connection.  It can contain letters, numbers, undescores and the minus-sign." $w.help
	RegisterHelpWindow $w.conName "Enter a name for this connection.  It can contain letters, numbers, undescores and the minus-sign." $w.help
    }

    label $w.luser -text "User Name: " -anchor e
    entry $w.user -width 15
    RegisterHelpWindow $w.luser "Enter your user name.  Do not add a domain-name after the user name." $w.help
    RegisterHelpWindow $w.user "Enter your user name.  Do not add a domain-name after the user name." $w.help

    label $w.lnet -text "Network: " -anchor e
    entry $w.network -width 15
    RegisterHelpWindow $w.lnet "Some ISP's require you to enter their domain-name here (e.g. \"sympatico.ca\")." $w.help
    RegisterHelpWindow $w.network "Some ISP's require you to enter their domain-name here (e.g. \"sympatico.ca\")." $w.help

    label $w.lpass -text "Password: " -anchor e
    entry $w.pass -width 15 -show "*"
    RegisterHelpWindow $w.lpass "Enter your password." $w.help
    RegisterHelpWindow $w.pass "Enter your password." $w.help

    grid $w.lconName $w.conName -in $basic -sticky nsew
    grid $w.luser $w.user -in $basic -sticky nsew
    grid $w.lnet $w.network -in $basic -sticky nsew
    grid $w.lpass $w.pass -in $basic -sticky nsew
    grid columnconfigure $basic 1 -weight 1

    # ----------- INTERFACES PAGE -------------
    set ifs {}
    catch {set ifs [GetEthernetInterfaces]}

    label $w.lifname -text "Ethernet Interface: " -anchor e
    entry $w.ifname -width 8
    RegisterHelpWindow $w.lifname "Enter Ethernet interface to which DSL modem is attached." $w.help
    RegisterHelpWindow $w.ifname "Enter Ethernet interface to which DSL modem is attached." $w.help

    if {[llength $ifs] > 0} {
	menubutton $w.ifmb -relief raised -text "..." -menu $w.ifmb.menu
	RegisterHelpWindow $w.ifmb "Browse detected Ethernet interface names." $w.help
	menu $w.ifmb.menu -tearoff 0
	foreach if $ifs {
	    $w.ifmb.menu add command -label $if -command "$w.ifname delete 0 end; $w.ifname insert end [list $if]"
	}
	grid $w.lifname $w.ifname $w.ifmb -in $interface -sticky nsew
    } else {
	grid $w.lifname $w.ifname - -in $interface -sticky nsew
    }

    label $w.ldns -text "DNS Setup: " -anchor e
    menubutton $w.dns -text "From Server" -menu $w.dns.menu -relief raised -indicatoron 1
    menu $w.dns.menu -tearoff 0
    foreach thing {"From Server" "Specify" "Do not Adjust"} {
	$w.dns.menu add command -label $thing -command [list SetDNSOption $w $thing]
    }
    RegisterHelpWindow $w.ldns "DNS server options:\n'From Server'   - Let PPPoE server specify DNS servers\n'Specify'       - Enter IP addresses of DNS servers yourself\n'Do not Adjust' - Leave your DNS setup alone." $w.help
    RegisterHelpWindow $w.dns "DNS server options:\n'From Server'   - Let PPPoE server specify DNS servers\n'Specify'       - Enter IP addresses of DNS servers yourself\n'Do not Adjust' - Leave your DNS setup alone." $w.help

    label $w.ldns1 -text "Primary DNS: " -anchor e
    entry $w.dns1 -width 16
    RegisterHelpWindow $w.ldns1 "Enter the IP address of the primary DNS server." $w.help
    RegisterHelpWindow $w.dns1 "Enter the IP address of the primary DNS server." $w.help
    label $w.ldns2 -text "Secondary DNS: " -anchor e
    entry $w.dns2 -width 16
    RegisterHelpWindow $w.ldns2 "Enter the IP address of the secondary DNS server." $w.help
    RegisterHelpWindow $w.dns2 "Enter the IP address of the secondary DNS server." $w.help

    SetDNSOption $w "From Server"
    grid $w.ldns $w.dns - -in $interface -sticky nsew
    grid $w.ldns1 $w.dns1 - -in $interface -sticky nsew
    grid $w.ldns2 $w.dns2 - -in $interface -sticky nsew

    # If only one Ethernet interface, select it by default
    if {[llength $ifs] == 1} {
	$w.ifname insert end [lindex $ifs 0]
    }

    grid columnconfigure $interface 1 -weight 1
    # ----------- OPTS PAGE -------------
    checkbutton $w.nonroot -text "Allow use by non-root users" -variable OPTS(nonroot) -anchor w
    RegisterHelpWindow $w.nonroot "If enabled, ordinary users can start and stop this connection." $w.help
    checkbutton $w.sync -text "Use synchronous PPP" -variable OPTS(sync) -anchor w
    RegisterHelpWindow $w.sync "Use synchronous PPP (recommended -- easier on the CPU.)" $w.help
    label $w.lfw -text "Firewalling: " -anchor e
    if {[llength $ifs] == 1} {
	set defaultFW "Stand-Alone"
    } else {
	set defaultFW "Masquerading"
    }
    menubutton $w.fw -text $defaultFW -menu $w.fw.menu -indicatoron 1 -relief raised
    menu $w.fw.menu -tearoff 0
    foreach type {Stand-Alone Masquerading None} {
	$w.fw.menu add command -label $type -command [list $w.fw configure -text $type]
    }
    
    RegisterHelpWindow $w.lfw "Firewalling options:\nStand-Alone  - A stand-alone machine.\nMasquerading - A gateway machine used for Internet sharing.\nNone         - Use if you already have your own firewall rules or want to run servers." $w.help
    RegisterHelpWindow $w.fw "Firewalling options:\nStand-Alone  - A stand-alone machine.\nMasquerading - A gateway machine used for Internet sharing.\nNone         - Use if you already have your own firewall rules or want to run servers." $w.help
    grid $w.nonroot - -in $opts -sticky nsew
    grid $w.sync - -in $opts -sticky nsew
    grid $w.lfw $w.fw -in $opts -sticky nsw
    grid columnconfigure $opts 1 -weight 1

    # ----------- ADVANCED PAGE -------------
    label $w.lsn -text "Service-Name: " -anchor e
    entry $w.servicename -width 24

    label $w.lac -text "AC-Name: " -anchor e
    entry $w.acname -width 24

    RegisterHelpWindow $w.lac "Enter access concentrator name if required.  Most ISPs do not require this; try leaving it blank." $w.help
    RegisterHelpWindow $w.acname "Enter access concentrator name if required.  Most ISPs do not require this; try leaving it blank." $w.help
    grid $w.lsn $w.servicename -in $advanced -sticky nsew
    grid $w.lac $w.acname -in $advanced -sticky nsew
    RegisterHelpWindow $w.lsn "Enter service name if required.  Most ISPs do not require this; try leaving it blank." $w.help
    RegisterHelpWindow $w.servicename "Enter service name if required.  Most ISPs do not require this; try leaving it blank." $w.help

    grid columnconfigure $advanced 1 -weight 1

    # ----------- BUTTONS -------------
    frame $w.buttons
    button $w.ok -text "OK" -command [list NewPPPoEConnectionOK $name $w]
    button $w.cancel -text "Cancel" -command [list destroy $w]
    pack $w.ok $w.cancel -in $w.buttons -expand 0 -fill none -side left

    pack $w.tn -side top -expand 1 -fill both

    text $w.help -width 60 -wrap word -state disabled -height 6
    pack $w.help -side top -expand 0 -fill both
    pack $w.buttons -side top -expand 0 -fill x

    # If we're editing existing connection, fill GUI with current values
    if {"$name" != ""} {
	FillConnectionGui $w $name
    }
    wm deiconify $w
    update idletasks
    raise $w
}

#***********************************************************************
# %PROCEDURE: SetDNSOption
# %ARGUMENTS:
#  w -- connection-editing window
#  opt -- value of DNS option
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Adjusts GUI for specified option
#***********************************************************************
proc SetDNSOption { w opt } {
    $w.dns configure -text $opt
    if {"$opt" == "Specify"} {
	$w.dns1 configure -state normal -background white
	$w.dns2 configure -state normal -background white
    } else {
	$w.dns1 configure -state disabled -background "#d9d9d9"
	$w.dns2 configure -state disabled -background "#d9d9d9"
    }
}

# ----------------------------------------------------------------------
# Tabbed notebook code from "Effective Tcl/Tk Programming"
# ----------------------------------------------------------------------
#  EXAMPLE: tabnotebook that can dial up pages
# ----------------------------------------------------------------------
#  Effective Tcl/Tk Programming
#    Mark Harrison, DSC Communications Corp.
#    Michael McLennan, Bell Labs Innovations for Lucent Technologies
#    Addison-Wesley Professional Computing Series
# ======================================================================
#  Copyright (c) 1996-1997  Lucent Technologies Inc. and Mark Harrison
# ======================================================================

option add *Tabnotebook.tabs.background #666666 widgetDefault
option add *Tabnotebook.margin 6 widgetDefault
option add *Tabnotebook.tabColor #a6a6a6 widgetDefault
option add *Tabnotebook.activeTabColor #d9d9d9 widgetDefault
option add *Tabnotebook.tabFont \
    -*-helvetica-bold-r-normal--*-120-* widgetDefault

proc tabnotebook_create {win} {
    global tnInfo

    frame $win -class Tabnotebook
    canvas $win.tabs -highlightthickness 0
    pack $win.tabs -fill x

    notebook_create $win.notebook
    pack $win.notebook -expand yes -fill both

    set tnInfo($win-tabs) ""
    set tnInfo($win-current) ""
    set tnInfo($win-pending) ""
    return $win
}

proc tabnotebook_page {win name} {
    global tnInfo

    set page [notebook_page $win.notebook $name]
    lappend tnInfo($win-tabs) $name

    if {$tnInfo($win-pending) == ""} {
        set id [after idle [list tabnotebook_refresh $win]]
        set tnInfo($win-pending) $id
    }
    return $page
}

proc tabnotebook_refresh {win} {
    global tnInfo

    $win.tabs delete all

    set margin [option get $win margin Margin]
    set color [option get $win tabColor Color]
    set font [option get $win tabFont Font]
    set x 2
    set maxh 0

    foreach name $tnInfo($win-tabs) {
        set id [$win.tabs create text \
            [expr $x+$margin+2] [expr -0.5*$margin] \
            -anchor sw -text $name -font $font \
            -tags [list $name]]

        set bbox [$win.tabs bbox $id]
        set wd [expr [lindex $bbox 2]-[lindex $bbox 0]]
        set ht [expr [lindex $bbox 3]-[lindex $bbox 1]]
        if {$ht > $maxh} {
            set maxh $ht
        }

        $win.tabs create polygon 0 0  $x 0 \
            [expr $x+$margin] [expr -$ht-$margin] \
            [expr $x+$margin+$wd] [expr -$ht-$margin] \
            [expr $x+$wd+2*$margin] 0 \
            2000 0  2000 10  0 10 \
            -outline black -fill $color \
            -tags [list $name tab tab-$name]

        $win.tabs raise $id

        $win.tabs bind $name <ButtonPress-1> \
            [list tabnotebook_display $win $name]

        set x [expr $x+$wd+2*$margin]
    }
    set height [expr $maxh+2*$margin]
    $win.tabs move all 0 $height

    $win.tabs configure -width $x -height [expr $height+4]

    if {$tnInfo($win-current) != ""} {
        tabnotebook_display $win $tnInfo($win-current)
    } else {
        tabnotebook_display $win [lindex $tnInfo($win-tabs) 0]
    }
    set tnInfo($win-pending) ""
}

proc tabnotebook_display {win name} {
    global tnInfo

    notebook_display $win.notebook $name

    set normal [option get $win tabColor Color]
    $win.tabs itemconfigure tab -fill $normal

    set active [option get $win activeTabColor Color]
    $win.tabs itemconfigure tab-$name -fill $active
    $win.tabs raise $name

    set tnInfo($win-current) $name
}

# ----------------------------------------------------------------------
#  EXAMPLE: simple notebook that can dial up pages
# ----------------------------------------------------------------------
#  Effective Tcl/Tk Programming
#    Mark Harrison, DSC Communications Corp.
#    Michael McLennan, Bell Labs Innovations for Lucent Technologies
#    Addison-Wesley Professional Computing Series
# ======================================================================
#  Copyright (c) 1996-1997  Lucent Technologies Inc. and Mark Harrison
# ======================================================================

option add *Notebook.borderWidth 2 widgetDefault
option add *Notebook.relief sunken widgetDefault

proc notebook_create {win} {
    global nbInfo

    frame $win -class Notebook
    pack propagate $win 0

    set nbInfo($win-count) 0
    set nbInfo($win-pages) ""
    set nbInfo($win-current) ""
    return $win
}

proc notebook_page {win name} {
    global nbInfo

    set page "$win.page[incr nbInfo($win-count)]"
    lappend nbInfo($win-pages) $page
    set nbInfo($win-page-$name) $page

    frame $page

    if {$nbInfo($win-count) == 1} {
        after idle [list notebook_display $win $name]
    }
    return $page
}

proc notebook_display {win name} {
    global nbInfo

    set page ""
    if {[info exists nbInfo($win-page-$name)]} {
        set page $nbInfo($win-page-$name)
    } elseif {[winfo exists $win.page$name]} {
        set page $win.page$name
    }
    if {$page == ""} {
        error "bad notebook page \"$name\""
    }

    notebook_fix_size $win

    if {$nbInfo($win-current) != ""} {
        pack forget $nbInfo($win-current)
    }
    pack $page -expand yes -fill both
    set nbInfo($win-current) $page
}

proc notebook_fix_size {win} {
    global nbInfo

    update idletasks

    set maxw 0
    set maxh 0
    foreach page $nbInfo($win-pages) {
        set w [winfo reqwidth $page]
        if {$w > $maxw} {
            set maxw $w
        }
        set h [winfo reqheight $page]
        if {$h > $maxh} {
            set maxh $h
        }
    }
    set bd [$win cget -borderwidth]
    set maxw [expr $maxw+2*$bd]
    set maxh [expr $maxh+2*$bd]
    $win configure -width $maxw -height $maxh
}

#***********************************************************************
# %PROCEDURE: SetupGuiToList
# %ARGUMENTS:
#  w -- the PPPoE connection setup window
# %RETURNS:
#  A list of (name value) pairs for the connection.
# %DESCRIPTION:
#  Reads values from the GUI; makes a list.
#***********************************************************************
proc SetupGuiToList { w } {
    global OPTS
    set ans {}
    if {[catch {lappend ans ConnectionName [$w.conName get]}]} {
	lappend ans ConnectionName [$w.conName cget -text]
    }
    lappend ans UserName       [$w.user get]
    lappend ans NetworkName    [$w.network get]
    lappend ans Password       [$w.pass get]
    lappend ans Interface      [$w.ifname get]
    lappend ans DNSType        [$w.dns cget -text]
    lappend ans DNS1           [$w.dns1 get]
    lappend ans DNS2           [$w.dns2 get]
    lappend ans NonrootOK      $OPTS(nonroot)
    lappend ans Sync           $OPTS(sync)
    lappend ans FirewallType   [$w.fw cget -text]
    lappend ans ServiceName    [$w.servicename get]
    lappend ans ACName         [$w.acname get]

    # Validate
    set name [value $ans ConnectionName]
    if {![regexp -nocase {^[-a-z0-9_]+$} $name]} {
	error "Connection name must be non-blank and contain only letters, digits, `_' and `-'"
    }

    # Check DNS
    set type [value $ans DNSType]
    if {"$type" == "Specify"} {
	set dns [value $ans DNS1]
	if {![regexp {[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+} "$dns"]} {
	    error "Primary DNS entry must consist of four dot-separated decimal numbers"
	}
	set dns [value $ans DNS2]
	if {"$dns" != "" && ![regexp {[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+} "$dns"]} {
	    error "Secondary DNS entry must consist of four dot-separated decimal numbers"
	}
    }
    return $ans
}

#***********************************************************************
# %PROCEDURE: ListToSetupGui
# %ARGUMENTS:
#  w -- the PPPoE connection setup window
#  lst -- a list of name/value pairs
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Updates GUI to reflect lst
#***********************************************************************
proc ListToSetupGui { w lst } {
    global OPTS
    foreach {key value} $lst {
	switch -exact -- $key {
	    ConnectionName {
		catch {
		    $w.conName delete 0 end
		    $w.conName insert end $value
		}
		catch {
		    $w.conName configure -text $value
		}
	    }
	    UserName {
		$w.user delete 0 end
		$w.user insert end $value
	    }
	    NetworkName {
		$w.network delete 0 end
		$w.network insert end $value
	    }
	    Password {
		$w.pass delete 0 end
		$w.pass insert end $value
	    }
	    Interface {
		$w.ifname delete 0 end
		$w.ifname insert end $value
	    }
	    DNSType {
		SetDNSOption $w $value
	    }
	    DNS1 {
		set oldstate [$w.dns1 cget -state]
		$w.dns1 configure -state normal
		$w.dns1 delete 0 end
		$w.dns1 insert end $value
		$w.dns1 configure -state $oldstate
	    }
	    DNS2 {
		set oldstate [$w.dns2 cget -state]
		$w.dns2 configure -state normal
		$w.dns2 delete 0 end
		$w.dns2 insert end $value
		$w.dns2 configure -state $oldstate
	    }
	    NonrootOK {
		set OPTS(nonroot) $value
	    }
	    Sync {
		set OPTS(sync) $value
	    }
	    FirewallType {
		$w.fw configure -text $value
	    }
	    ServiceName {
		$w.servicename delete 0 end
		$w.servicename insert end $value
	    }
	    ACName {
		$w.acname delete 0 end
		$w.acname insert end $value
	    }
	}
    }
}

proc NewPPPoEConnectionOK { name w } {
    if {[catch {set conn [SetupGuiToList $w]} err]} {
	tk_dialog .err "Invalid Parameters" "$err" error 0 OK
	return
    }
    if {"$name" == ""} {
	set name [value $conn ConnectionName]
	set tmp [GetConnection $name]
	if {"$tmp" != ""} {
	tk_dialog .err "Connection Exists" "The connection `$name' already exists.  Pick another name." error 0 OK
	return
	}
    }
    ReplaceConnection $conn
    SaveConnectionInfo
    BuildConnectionMenu
    SwitchConnection $name
    destroy $w
}

proc SaveConnectionInfo {} {
    global ConnectionInfo ConnectionInfoFile PasswordFile
    set fp [open "$ConnectionInfoFile.new" "w"]
    puts $fp "# RP-PPPoE GUI Configuration Information."
    puts $fp "# This file may *look* human-editable, but it is NOT."
    puts $fp "# So, you with the text editor:  Keep away from this file."
    puts $fp "#"
    set expunged {}
    set passwords {}
    foreach thing $ConnectionInfo {
	set name [value $thing ConnectionName]
	set password [value $thing Password]
	set pwindex [lsearch -exact $thing Password]
	set safe [lreplace $thing $pwindex [expr $pwindex+1]]
	set pwd [list ConnectionName $name Password $password]
	lappend expunged $safe
	lappend passwords $pwd
    }
    puts $fp $expunged
    close $fp
    set fp [open "$PasswordFile.new" "w"]
    exec chmod 600 "$PasswordFile.new"
    puts $fp "# RP-PPPoE GUI Configuration Information."
    puts $fp "# This file may *look* human-editable, but it is NOT."
    puts $fp "# So, you with the text editor:  Keep away from this file."
    puts $fp "#"
    puts $fp $passwords
    close $fp
    file rename -force "$ConnectionInfoFile.new" "$ConnectionInfoFile"
    file rename -force "$PasswordFile.new" "$PasswordFile"

    # Generate config files for adsl-start for each connection
    foreach thing $ConnectionInfo {
	GenerateConfigFile $thing
    }

    # Now update /etc/ppp/pap-secrets and /etc/ppp/chap-secrets
    foreach thing $ConnectionInfo {
	GenerateSecretsEntry $thing
    }
}

#***********************************************************************
# %PROCEDURE: ReadShellEscapedWord
# %ARGUMENTS:
#  str -- a string
# %RETURNS:
#  A two-element list -- the first element is a shell-escaped word
#  extracted from $str, just the way pppd parses /etc/ppp/pap-secrets.
#  The second element is the remaining portion of $str
#***********************************************************************
proc ReadShellEscapedWord { str } {
    set ans {}
    set rest $str

    # Chew up leading spaces
    set rest [string trimleft $rest]

    # If first char is a quote, read until a quote
    if {"[string index $rest 0]" == "\""} {
	set rest [string range $rest 1 end]
	set nextquote [string first "\"" $rest]
	# If no following quote, pretend we haven't seen a quote, I guess.
	if {$nextquote >= 0} {
	    set ans [string range $rest 0 [expr $nextquote-1]]
	    set rest [string range $rest [expr $nextquote+1] end]
	    return [list $ans $rest]
	}
    }

    # Not a quote; chew through the string until an unescaped space
    while {[string length $rest] > 0} {
	set char [string index $rest 0]
	set rest [string range $rest 1 end]
	# Sneaky test for whitespace in Tcl 8.0
	if {"[string trim $char]" == ""} {
	    return [list $ans $rest]
	}
	if {"$char" == "\\"} {
	    set char [string index $rest 0]
	    set rest [string range $rest 1 end]
	}
	append ans $char
    }
    return [list $ans $rest]
}


#***********************************************************************
# %PROCEDURE: GenerateSecretsEntry
# %ARGUMENTS:
#  conn -- a connection key/value list
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Adds entries to /etc/ppp/pap-secrets and /etc/ppp/chap-secrets.
#***********************************************************************
proc GenerateSecretsEntry { conn } {
    set user [value $conn UserName]
    set net [value $conn NetworkName]
    set password [value $conn Password]
    if {"$net" != ""} {
	set user "$user@$net"
    }
    GenerateSecretsEntryForFile $user $password "/etc/ppp/pap-secrets"
    GenerateSecretsEntryForFile $user $password "/etc/ppp/chap-secrets"
}

#***********************************************************************
# %PROCEDURE: GenerateSecretsEntryForFile
# %ARGUMENTS:
#  user -- user name
#  password -- password
#  fname -- file to add entry to.
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Adds entries to /etc/ppp/pap-secrets or /etc/ppp/chap-secrets.
#***********************************************************************
proc GenerateSecretsEntryForFile { user password fname } {
    # Copy $fname to $fname.new
    set out [open "$fname.new" "w"]
    exec chmod go-rwx "$fname.new"
    if {[file exists $fname]} {
	set in [open $fname "r"]
	while {[gets $in line] >= 0} {
	    set trimmed [string trim $line]
	    if {"$trimmed" == ""} {
		puts $out $line
		continue
	    }
	    if {[string match "#*" $trimmed]} {
		puts $out $line
		continue
	    }

	    # Read the user name off the line; copy it unless it's our
	    # user name.
	    foreach {word dummy} [ReadShellEscapedWord $line] {break}
	    if {$word != $user} {
		puts $out $line
	    }
	}
	close $in
    }

    # Now add our line
    set user [ShellEscape $user]
    set password [ShellEscape $password]
    puts $out "$user\t*\t$password\t*"
    close $out
    file rename -force $fname.new $fname
}

#***********************************************************************
# %PROCEDURE: ShellEscape
# %ARGUMENTS:
#  str
# %RETURNS:
#  A version of $str with shell meta-characters escaped
#***********************************************************************
proc ShellEscape { str } {
    set ans ""
    foreach char [split $str ""] {
	if {[string first $char "01234567890ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_+=-@./"] >= 0} {
	    append ans $char
	} else {
	    append ans "\\$char"
	}
    }
    return $ans
}


#***********************************************************************
# %PROCEDURE: GenerateConfigFile
# %ARGUMENTS:
#  conn -- a connection key/value list
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Generates a configuration file for adsl-start and friends under
#  /etc/ppp/rp-pppoe-gui
#***********************************************************************
proc GenerateConfigFile { conn } {
    global ConfigDir
    set name [value $conn ConnectionName]
    set fname [file join $ConfigDir conf.$name]
    set fp [open "$fname.new" w]
    puts $fp "# Configuration file for connection `$name'."
    puts $fp "# Automatically generated.  Do not edit by hand."
    puts $fp ""
    foreach {var val} $conn {
	switch -exact $var {
	    UserName {
		set net [value $conn NetworkName]
		if {"$net" != ""} {
		    set user "$val@$net"
		} else {
		    set user "$val"
		}
		puts $fp [ShellEscape "USER=$user"]
	    }
	    Interface {
		puts $fp [ShellEscape "ETH=$val"]
	    }
	    DNSType {
		if {"$val" == "From Server"} {
		    puts $fp "DNSTYPE=SERVER"
		    puts $fp "USEPEERDNS=yes"
		} elseif {"$val" == "Specify"} {
		    puts $fp "DNSTYPE=SPECIFY"
		    puts $fp "USEPEERDNS=no"
		} else {
		    puts $fp "DNSTYPE=NOCHANGE"
		    puts $fp "USEPEERDNS=no"
		}
	    }
	    DNS1 {
		puts $fp [ShellEscape "DNS1=$val"]
	    }
	    DNS2 {
		puts $fp [ShellEscape "DNS2=$val"]
	    }
	    NonrootOK {
		if {$val} {
		    puts $fp "NONROOT=OK"
		}
	    }
	    ACName {
		puts $fp [ShellEscape "ACNAME=$val"]
	    }
	    ServiceName {
		puts $fp [ShellEscape "SERVICENAME=$val"]
	    }
	    FirewallType {
		if {"$val" == "None"} {
		    puts $fp "FIREWALL=NONE"
		} elseif {"$val" == "Masquerading"} {
		    puts $fp "FIREWALL=MASQUERADE"
		} else {
		    puts $fp "FIREWALL=STANDALONE"
		}
	    }
	    Sync {
		if {$val} {
		    puts $fp "SYNCHRONOUS=yes"
		} else {
		    puts $fp "SYNCHRONOUS=no"
		}
	    }
	}
    }
    puts $fp "CONNECT_TIMEOUT=30"
    puts $fp "CONNECT_POLL=1"
    puts $fp "FORCEPING=\".\""
    puts $fp "PIDFILE=/var/run/adsl-$name.pid"
    puts $fp "CLAMPMSS=1412"
    puts $fp "LCP_INTERVAL=20"
    puts $fp "LCP_FAILURE=3"
    puts $fp "PPPOE_TIMEOUT=80"
    puts $fp "LINUX_PLUGIN="
    puts $fp "DEMAND=no"
    close $fp
    file rename -force "$fname.new" "$fname"
}

#***********************************************************************
# %PROCEDURE: GetConnectionStatus
# %ARGUMENTS:
#  conn -- connection name
# %RETURNS:
#  A three-element list:
#  {started/stopped up/down if}
#  If first element is "started", then connection has been started.
#  If second element is "up", then connection is up.
#  If connection is up, third element is PPP interface.
#***********************************************************************
proc GetConnectionStatus { conn } {
    set pidfile "/var/run/adsl-$conn.pid"

    # Check for PID file
    if {![file readable $pidfile]} {
	return {stopped down ""}
    }
    set fp [open $pidfile "r"]
    gets $fp pid
    close $fp

    # Check if process is dead
    if {![file exists "/proc/$pid"]} {
	# The pppd might still be running... doh...
	if {![file readable "$pidfile.pppd"]} {
	    return {stopped down ""}
	}
	set fp [open "$pidfile.pppd" "r"]
	gets $fp pid
	close $fp
	if {![file exists "/proc/$pid"]} {
	    return {stopped down ""}
	}
    }

    # Now get PID of pppd
    if {![file readable "$pidfile.pppd"]} {
	return {started down ""}
    }
    set fp [open "$pidfile.pppd" "r"]
    gets $fp pid
    close $fp

    # Find interface to which it corresponds
    set pppdfiles [glob -nocomplain "/var/run/ppp*.pid"]
    set found {}
    foreach file $pppdfiles {
	set fp [open $file "r"]
	gets $fp ifpid
	close $fp
	if {$ifpid == $pid} {
	    set found [file rootname [file tail $file]]
	    break
	}
    }
    if {"$found" == ""} {
	return {started down ""}
    }
    return [list started up $found]
}

#***********************************************************************
# %PROCEDURE: UpdateConnectionState
# %ARGUMENTS:
#  fromAfter -- if 1, was called from an "after" callback.
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Updates the "LED" displays; periodically reschedules itself to keep
#  updating display.
#***********************************************************************
proc UpdateConnectionState {{fromAfter 1}} {
    global UpdateToken
    global Packets
    global Bytes
    global UpdateInterval
    global MeasureTime
    if {$fromAfter} {
	set UpdateToken ""
    }

    set conn [GetCurrentConnection]
    if {"$conn" == ""} {
	ConnectionStateOff
	ResetGraph
	if {"$UpdateToken" != ""} {
	    after cancel $UpdateToken
	    set UpdateToken {}
	}
	return
    }

    foreach {startstop updown interface} [GetConnectionStatus $conn] {break}
    if {"$startstop" == "stopped"} {
	ConnectionStateOff
	ResetGraph
    } elseif {"$updown" == "down"} {
	ConnectionStateDown
	ResetGraph
    } else {
	# Get the packet counts
	set found 0
	set fp [open "/proc/net/dev" "r"]
	while {[gets $fp line] >= 0} {
	    if {![string match "*$interface:*" $line]} {
		continue
	    }
	    set colon [string first ":" $line]
	    if {$colon < 0} {
		continue
	    }
	    set line [string range $line [expr $colon+1] end]
	    set found 1
	    set MeasureTime [clock seconds]
	    break
	}
	close $fp
	if {$found} {
	    foreach {rbytes rpacks rerrs rdrop rfifo rframe rcomp rmulti tbytes tpacks} $line {break}
	    if {!$fromAfter} {
		set Packets(in) $rpacks
		set Packets(out) $tpacks
		set Bytes(in) $rbytes
		set Bytes(out) $tbytes
		ConnectionStateUp
		ResetGraph
	    } else {
		if {$rpacks != $Packets(in)} {
		    ConnectionReceiveActive
		} else {
		    ConnectionReceiveUp
		}
		if {$tpacks != $Packets(out)} {
		    ConnectionTransmitActive
		} else {
		    ConnectionTransmitUp
		}
		set Packets(in) $rpacks
		set Packets(out) $tpacks
		set Bytes(in) $rbytes
		set Bytes(out) $tbytes
		UpdateGraph
	    }
	} else {
	    ConnectionStateUp
	    ResetGraph
	}
    }
    if {"$UpdateToken" == ""} {
	set UpdateToken [after $UpdateInterval UpdateConnectionState]
    }
    if {$fromAfter} {
	SetButtonStates
    }
}

proc ConnectionStateOff {} {
    .c itemconfigure xmitrect -fill "#A0A0A0"
    .c itemconfigure recvrect -fill "#A0A0A0"
}

proc ConnectionStateDown {} {
    .c itemconfigure xmitrect -fill "#A00000"
    .c itemconfigure recvrect -fill "#A00000"
}

proc ConnectionStateUp {} {
    .c itemconfigure xmitrect -fill "#00D000"
    .c itemconfigure recvrect -fill "#00D000"
}

proc ConnectionTransmitActive {} {
    .c itemconfigure xmitrect -fill "#FFFF00"
}

proc ConnectionTransmitUp {} {
    .c itemconfigure xmitrect -fill "#00D000"
}

proc ConnectionReceiveActive {} {
    .c itemconfigure recvrect -fill "#FFFF00"
}

proc ConnectionReceiveUp {} {
    .c itemconfigure recvrect -fill "#00D000"
}

proc ResetGraph {} {
    global GraphPoints
    set GraphPoints(in) {}
    set GraphPoints(out) {}
    set GraphPoints(times) {}
    .graph delete all
    UpdateGraph
}

proc UpdateGraph {} {
    global GraphPoints Bytes UpdateInterval MeasureTime
    lappend GraphPoints(times) $MeasureTime
    lappend GraphPoints(in) $Bytes(in)
    lappend GraphPoints(out) $Bytes(out)

    set w [winfo width .graph]
    set w2 [expr $w/2]

    set h [winfo height .graph]
    set toChop [expr [llength $GraphPoints(in)] - $w2 - 1]
    if {$toChop > 0} {
	set GraphPoints(in) [lrange $GraphPoints(in) $toChop end]
    }
    set toChop [expr [llength $GraphPoints(out)] - $w2 - 1]
    if {$toChop > 0} {
	set GraphPoints(out) [lrange $GraphPoints(out) $toChop end]
    }
    set toChop [expr [llength $GraphPoints(times)] - $w2 - 1]
    if {$toChop > 0} {
	set GraphPoints(times) [lrange $GraphPoints(times) $toChop end]
    }

    set prev [lindex $GraphPoints(in) 0]
    set incoords {}
    set outcoords {}
    set inmax 0
    set outmax 0
    foreach thing [lrange $GraphPoints(in) 1 end] {
	set diff [expr $thing - $prev]
	set prev $thing
	lappend incoords $diff
	if {$diff > $inmax} {
	    set inmax $diff
	}
    }

    set prev [lindex $GraphPoints(out) 0]
    foreach thing [lrange $GraphPoints(out) 1 end] {
	set diff [expr $thing - $prev]
	set prev $thing
	lappend outcoords $diff
	if {$diff > $outmax} {
	    set outmax $diff
	}
    }

    if {$inmax == 0} { set inmax 1 }
    if {$outmax == 0} { set outmax 1 }
    # Draw the transmit line
    set x 0
    set hh [expr $h-4]
    set scaled {}
    foreach thing $outcoords {
	lappend scaled $x [expr double($h) - 2 - (double($hh) * double($thing) / double($outmax))]
	incr x
    }

    .graph delete all
    if {[llength $scaled] >= 4} {
	eval ".graph create line $scaled -fill #A00000"
	set bits [expr 8.0 * ([lindex $GraphPoints(out) end] - [lindex $GraphPoints(out) 0])]
	set timediff [expr [lindex $GraphPoints(times) end] - [lindex $GraphPoints(times) 0]]
	if {$timediff != 0} {
	    set bps [Pretty [expr double($bits) / $timediff]]
	    .graph create text 2 2 -anchor nw -font fixed -text "$bps"
	}
    }

    # Draw the receive line
    set x $w2
    set scaled {}
    foreach thing $incoords {
	lappend scaled $x [expr double($h) - 2 - (double($hh) * double($thing) / double($inmax))]
	incr x
    }

    if {[llength $scaled] >= 4} {
	eval ".graph create line $scaled -fill #00A000"
	set bits [expr 8.0 * ([lindex $GraphPoints(in) end] - [lindex $GraphPoints(in) 0])]
	set timediff [expr [lindex $GraphPoints(times) end] - [lindex $GraphPoints(times) 0]]
	if {$timediff != 0} {
	    set bps [Pretty [expr double($bits) / $timediff]]
	    .graph create text [expr $w2+2] 2 -anchor nw -font fixed -text "$bps"
	}
    }
}

proc Pretty { n } {
    if {$n < 0} {
	return "***"
    }
    if {$n < 1000} {
	return [format "%.1f" $n]
    }
    set n [expr $n/1000.0]
    if {$n < 1000} {
	return [format "%.1fk" $n]
    }
    set n [expr $n/1000.0]
    if {$n < 1000} {
	return [format "%.1fM" $n]
    }
    set n [expr $n/1000.0]
    return [format "%.1fG" $n]
}

#***********************************************************************
# %PROCEDURE: Help
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Opens help page
#***********************************************************************
proc Help {} {
    if {![file readable /usr/share/rp-pppoe-gui/tkpppoe.html]} {
	    tk_dialog .err Error "Help file '/usr/share/rp-pppoe-gui/tkpppoe.html' is not installed" error 0 OK	
	return
    }
    catch { exec /bin/sh -c "netscape -remote 'openURL(/usr/share/rp-pppoe-gui/tkpppoe.html)' || netscape /usr/share/rp-pppoe-gui/tkpppoe.html" > /dev/null 2>/dev/null & }
}

	

#***********************************************************************
# %PROCEDURE: doLogo
# %ARGUMENTS:
#  None
# %RETURNS:
#  Nothing
# %DESCRIPTION:
#  Does the logo thing
#***********************************************************************
proc doLogo {} {
    global AlreadyRunFile ConfigDir
    if {[file exists $AlreadyRunFile]} {
	return
    }
    catch { file mkdir $ConfigDir }
    catch { close [open $AlreadyRunFile "w"] }
    canvas .c -width 374 -height 286 -bg #FFFFCC
    pack .c
    drawLogo .c #FFFFCC

    # Funky effect
    .c create text 4 4 -anchor nw -text "Welcome to RP-PPPoE" \
	    -fill red -font {-family times -size -24 -weight bold} -tags pppoe
    .c lower pppoe

    .c move logo -300 0

    update idletasks

    for {set i 0} {$i < 15} {incr i} {
	.c move logo 20 0
	update idletasks
	after 25
    }

    .c create text 4 28 -anchor nw -text "http://www.roaringpenguin.com" \
	    -fill red -font {-family courier -size -14 -weight bold}
    update idletasks
    after 2500
}

doLogo
catch { destroy .c }

# Try creating an empty config file if none exists
if {![file readable $ConnectionInfoFile]} {
    catch { file mkdir $ConfigDir }
    catch {
	set fp [open $ConnectionInfoFile "w"]
	close $fp
    }
}

CreateMainDialog