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Check a subnet for pingable systems
More on Expect example from a Well House Consultants training course
More on More on Expect [link]
Source code: subnet_test Module: T242
#!/usr/bin/env wish
package require Expect # Check a subnet for pingable systems - from Mac OS X system # Due to differing ping utilities, this script varies depending # on the system on which it is run. This one is for Mac OS X set subnet 192.168.200 # Set up 256 labels for .0 to .255 for {set j 0} {$j < 16} {incr j} { for {set k 0} {$k < 16} {incr k} { set val [expr $k + $j * 16] set system "$subnet.$val" set syslab [regsub -all {\.} $system "_"] # do not test .0 or .255 (broadcast addresses) if {$val == 0 || $val == 255} { label .la_$syslab -text $val -background grey } else { label .la_$syslab -text $val -background pink } # add system to grid grid .la_$syslab -column $j -row $k -sticky news -padx 2 -pady 2 # apply an equal weight to one cell in each row and column # this makes each cell in the grid the same size if {$j == $k} { grid rowconfigure . .la_$syslab -weight 1 -uniform w grid columnconfigure . .la_$syslab -weight 1 -uniform w } } } . config -background white label .report -text "Subnet $subnet.xxx not yet tested" button .quit -text quit -command exit # Define the "run" button that supports the action button .redo -text "Run tests" -command { # Clear all buttons to salmon for testing .report config -text "testing subnet $subnet.xxx" -background pink # Avoid nested requests by disabling run button while tests are running .redo config -state disabled for {set j 0} {$j < 16} {incr j} { for {set k 0} {$k < 16} {incr k} { set val [expr $k + $j * 16] set system "$subnet.$val" set syslab [regsub -all {\.} $system "_"] if {$val == 0 || $val == 255} { .la_$syslab config -background grey } else { .la_$syslab config -background salmon } } } log_user 0 set timeout 6 # spawn out a series of pings - in 16 batches of 16 for {set j 0} {$j < 16} {incr j} { set runningcount 0 set idlist "" for {set k 0} {$k < 16} {incr k} { set val [expr $k + $j * 16] if {$val > 0 && $val < 255} { set system "$subnet.$val" spawn ping -c 3 $system set id($system) $spawn_id set backlook($spawn_id) $system set good($system) 0 lappend idlist $id($system) set syslab [regsub -all {\.} $system "_"] .la_$syslab config -background red incr runningcount } } # gather up a series of responses set tidy $idlist while {$runningcount > 0} { expect { -i $idlist "\n" { set which $expect_out(spawn_id) lappend ans($which) $expect_out(buffer) set system $backlook($which) if {[regexp "^64 " $expect_out(buffer)]} { incr good($system) set newcol [lindex {red orange yellow white} $good($system)] set syslabel [regsub -all {\.} $system "_"] .la_$syslabel config -background $newcol } } eof { # search and remove completed host from idlist set donepos [lsearch $idlist $expect_out(spawn_id)] set idlist [lreplace $idlist $donepos $donepos] incr runningcount -1 } timeout { break } } } # Tidy up all the pings that hadn't closed foreach done $tidy { if { [catch {close -i $done} msg ] } { # ignore } else { wait -i $done } } # go round for next batch of 16 } # Give final report and re-enable the "run" button .report config -text "subnet $subnet.xxx test COMPLETED" -background yellow .redo config -state normal } # ------------------------ End of action command. Add final widgets to grid grid .report -row 16 -column 0 -columnspan 16 -sticky news grid .redo -row 17 -column 0 -columnspan 8 -sticky news grid .quit -row 17 -column 8 -columnspan 8 -sticky news # and enter main loop Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Tcl * Tcl Programming * Tcl Programming Also available on on site courses for larger groups Books covering this topic
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Other Examples
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other closely related examples on the "More on Expect" module index page.
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