#!/usr/bin/wish -f
#
# Linux dialer. Shows on/off line, time on-line, and
# pppd process identifier.
#
# (c) 1998 (GPL) Martin Vermeer
#
# User configurable:
#----------------------------------------
set path(pidof) /sbin/pidof
set path(pppd) /usr/sbin/pppd
set path(whoami) /usr/bin/whoami)
#----------------------------------------
# End user config

set seconds 0
set minutes 0
label  .counter -text "0:00" -relief sunken

## Test for root.
#
## Not needed if pppd suid root and /etc/ppp files 
## "options" and connect/disconnect scripts 
## (but NOT the "secrets" file!!! world readable
## (or readable to a group you belong to)
#
# catch "exec $path(whoami)" result
# if {$result != "root"} {
#     set labeltext "Run me as ROOT!"
#     after 10000 exit 
#}

# showpid -- routine to get and show process id, keep track
#            of pppd link up/down status, and reset time
#            counter if down
#
proc showpid {} {
    global pid labeltext status seconds minutes path

    if [catch "exec $path(pidof) pppd" pid] {set pid -1}
    if {$pid != -1} {
        set labeltext "Link pid: ${pid}"
        set status 1
    } else {
        set labeltext "Link Down"
        set status 0; set seconds 0; set minutes 0
    } 
}

# tick -- routine to increment clock by 5 seconds every
#         5 seconds, and minutes every minute.
#         Don't be on-line over an hour :-)
#
proc tick {} {
    global minutes seconds status pid labeltext
    if $status {
        after 5000 tick
        incr seconds 5
        if {$seconds >= 60} { set seconds 0; incr minutes }
    } 
    after 5000 showpid
    .counter config -text [format "%d:%02d" $minutes $seconds]
}

# 
# Find out if there was an old pppd process running:
#
if [catch "exec $path(pidof) pppd" pid] {set pid -1}
if {$pid != -1} {
    set labeltext "Old Link ${pid}"
    set status 1
    tick
} else {
    set labeltext "Link Down"
    set status 0
}

#
# Downcmd -- command to bring down the pppd link
#
proc Downcmd {} {
global status path
    # Get the pids of pppd processes into res:
    if [catch "exec $path(pidof) pppd" res] {set res -1} 
    if {$res != -1} {
        # Some pppd process running; go get'em
        catch "exec kill -9 $res" result
        # Debug code:
        # puts "pid=$res result=$result"
    }
    # Necessary to update $status to realistic value:
    showpid
    # await kill command to take effect:
    while {$status == 1} showpid   
    # don't come out until really down
}

# Upcmd -- Command to bring up the pppd link
#          and start the clock ticking
#
proc Upcmd {} {
    global status path seconds minutes
    # start up pppd:
    if [catch "exec $path(pidof) pppd" res] {set res -1}
    if {$res == -1} {
        # no pppd process running yet; start one
        catch "exec /usr/sbin/pppd"
        set status 1
	# start clock running
	set seconds 0
        set minutes 0
        tick
    }
    if {$res > 0} { 
        set labeltext "Old Link: ${res}" 
        set status 1
    }
}

#
# Define the widgets:
#
label        .name -textvariable labeltext 
radiobutton  .up   -text "Up"   -variable status -value 1 -command Upcmd
radiobutton  .down -text "Down" -variable status -value 0 -command Downcmd
button       .quit -text "Quit" -command exit

#
# Lay out grid geometry:
#
grid .name     -row 0 -column 0 -columnspan 2 -sticky "ew"
grid .up       -row 1 -column 1 -sticky "w"
grid .down     -row 2 -column 1 -sticky "w"
grid .quit     -row 2 -column 0 
grid .counter  -row 1 -column 0 -sticky "ns"