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# monitor.tcl --
#
# This file contains the implementation of some monitoring
# procedures which usually run in the background and create
# events using the event command. This is work in progress
# so this might change in future versions.
#
# Copyright (c) 1996 Technical University of Braunschweig.
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
package require Tnm
package provide TnmMonitor $tnm(version)
proc TnmGetStatusProc {job status vbl} {
array set cx [$job attribute status]
switch $status {
noError {
set value [lindex [lindex $vbl 0] 2]
if {$value != $cx(value)} {
event raise GetStatus:Change $cx(session) $cx(oid) $value
}
set cx(value) $value
$job attribute status [array get cx]
}
noSuchName {
event raise GetStatus:NoSuchName $cx(session) $cx(oid)
}
noResponse {
event raise GetStatus:NoResponse $cx(session)
}
}
}
proc TnmGetStatusCmd {} {
set job [job current]
array set cx [$job attribute status]
$cx(session) get $cx(oid) \
[subst { TnmGetStatusProc "$job" "%E" "%V" } ]
}
proc Tnm_MonitorStatus {s tree seconds} {
set result ""
set ms [expr $seconds * 1000]
foreach var $tree {
$s walk vbl $var {
set cx(session) [eval snmp session [$s configure]]
set cx(oid) [lindex [lindex $vbl 0] 0]
set cx(value) [lindex [lindex $vbl 0] 2]
set j [job create -command TnmGetStatusCmd -interval $ms]
$j attribute status [array get cx]
lappend result $j
}
}
return $result
}
#########################################################################
proc TnmGetValueProc {job status vbl} {
array set cx [$job attribute status]
switch $status {
noError {
set value [lindex [lindex $vbl 0] 2]
event raise GetValue:Value $cx(session) $cx(oid) $value
}
noSuchName {
event raise GetValue:NoSuchName $cx(session) $cx(oid)
}
noResponse {
event raise GetValue:NoResponse $cx(session)
}
}
}
proc TnmGetValueCmd {} {
set job [job current]
array set cx [$job attribute status]
$cx(session) get $cx(oid) \
[subst { TnmGetValueProc "$job" "%E" "%V" } ]
}
proc Tnm_MonitorValue {s tree seconds} {
set result ""
set ms [expr $seconds * 1000]
foreach var $tree {
$s walk vbl $var {
set cx(session) [eval snmp session [$s configure]]
set cx(oid) [lindex [lindex $vbl 0] 0]
set j [job create -command TnmGetValue -interval $ms]
$j attribute status [array get cx]
lappend result $j
}
}
return $result
}
#########################################################################
proc TnmGetUpTimeProc {job status vbl} {
switch $status {
noError {
array set cx [$job attribute status]
set uptime [lindex [lindex $vbl 0] 2]
if {$uptime < $cx(sysUpTime)} {
event raise SysUpTime:Restart $cx(session) $uptime
}
set cx(sysUpTime) $uptime
$job attribute status [array get cx]
}
noResponse {
event raise SysUpTime:NoResponse $cx(session)
}
}
}
proc TnmGetUpTimeCmd {} {
set job [job current]
array set cx [$job attribute status]
$cx(session) get sysUpTime.0 \
[subst { TnmGetUpTimeProc "$job" "%E" "%V" } ]
}
proc Tnm_MonitorSysUpTime {s seconds} {
set ms [expr $seconds * 1000]
set vbl [$s get sysUpTime.0]
set cx(session) [eval snmp session [$s configure]]
set cx(sysUpTime) [mib scan sysUpTime [lindex [lindex $vbl 0] 2]]
set j [job create -command TnmGetUpTime -interval $ms]
$j attribute status [array get cx]
return $j
}
#########################################################################
#
# Calculate the interface utilisation. This is done using the formula
#
# util = ( 8 * ( delta (ifInOctets, t1, t0)
# + delta (ifOutOctets, t1, t0) ) / (t1 - t0) ) / ifSpeed
#
# This formula returns incorrect results for full-duplex point to point
# links. In this case, the following formula should be used:
#
# util = ( 8 * max ( delta (ifInOctets, t1, t0) ,
# delta (ifOutOctets, t1, t0) ) / (t1 - t0) ) / ifSpeed
#
# See Simple Times, 1(5), November/December, 1992 for more details.
#
proc TnmGetIfLoadProc {job status vbl} {
if {$status != "noError"} return
array set cx [$job attribute status]
set ifIndex $cx(ifIndex)
set sysUpTime [mib scan sysUpTime [lindex [lindex $vbl 0] 2]]
set ifOperStatus [lindex [lindex $vbl 1] 2]
set ifInOctets [lindex [lindex $vbl 2] 2]
set ifOutOctets [lindex [lindex $vbl 3] 2]
# be careful with Tcl's broken arithmetic
if {[catch {expr $ifInOctets - $cx(ifInOctets)} deltaIn]} {
set deltaIn [expr double($ifInOctets) - $cx(ifInOctets)]
}
if {[catch {expr $ifOutOctets - $cx(ifOutOctets)} deltaOut]} {
set deltaOut [expr double($ifOutOctets) - $cx(ifOutOctets)]
}
if {$cx(fullduplex)} {
set delta [expr $deltaIn > $deltaOut ? $deltaIn : $deltaOut]
} else {
set delta [expr $deltaIn + $deltaOut]
}
if {$sysUpTime > $cx(sysUpTime) && $cx(ifSpeed) > 0} {
set secs [expr ($sysUpTime - $cx(sysUpTime)) / 100.0]
set val [expr (8.0 * $delta / $secs) / $cx(ifSpeed) * 100]
} else {
set val 0
}
event raise ifLoad $cx(session) $ifIndex $cx(ifDescr) $ifOperStatus $val
if {$ifOperStatus != $cx(ifOperStatus)} {
event raise ifStatusChange $ifIndex $cx(ifDescr) $ifOperStatus
}
set cx(sysUpTime) $sysUpTime
set cx(ifInOctets) $ifInOctets
set cx(ifOutOctets) $ifOutOctets
set cx(ifOperStatus) $ifOperStatus
$job attribute status [array get cx]
}
proc TnmGetIfLoad {} {
set job [job current]
array set cx [$job attribute status]
set i $cx(ifIndex)
set vbl "sysUpTime.0 ifOperStatus.$i ifInOctets.$i ifOutOctets.$i"
$cx(session) get $vbl [subst { TnmGetIfLoadProc "$job" "%E" "%V" } ]
}
#
# The following procedure walks the ifTable and starts an interface
# load monitoring procedure for every interface. We retrieve some
# initial status information from the agent to initialize the monitor
# jobs.
#
proc Tnm_MonitorIfLoad {s seconds {iterations {}}} {
set ms [expr $seconds * 1000]
set result ""
# The list of full duplex interface types. Note, IANAifType
# (RFC 1573) uses slightly different encodings than RFC 1213.
# We use RFC 1213 style here.
set fullDuplex {
regular1822 hdh1822 ddn-x25 rfc877-x25 lapb sdlc ds1 e1
basicISDN primaryISDN propPointToPointSerial ppp slip ds3 sip
frame-relay
}
$s walk vbl ifIndex {
set ifIndex [lindex [lindex $vbl 0] 2]
set vbl [$s get [list sysUpTime.0 \
ifInOctets.$ifIndex ifOutOctets.$ifIndex \
ifSpeed.$ifIndex ifDescr.$ifIndex \
ifType.$ifIndex ifOperStatus.$ifIndex]]
set cx(session) [eval snmp session [$s configure]]
set cx(ifIndex) $ifIndex
set cx(sysUpTime) [lindex [lindex $vbl 0] 2]
set cx(sysUpTime) [mib scan sysUpTime $cx(sysUpTime)]
set cx(ifInOctets) [lindex [lindex $vbl 1] 2]
set cx(ifOutOctets) [lindex [lindex $vbl 2] 2]
set cx(ifSpeed) [lindex [lindex $vbl 3] 2]
set cx(ifDescr) [lindex [lindex $vbl 4] 2]
set cx(ifType) [lindex [lindex $vbl 5] 2]
set cx(ifOperStatus) [lindex [lindex $vbl 6] 2]
set cx(fullduplex) [expr [lsearch $fullDuplex $cx(ifType)] < 0]
set j [job create -command TnmGetIfLoad -interval $ms]
if {$iterations != ""} {
$j configure -iterations $iterations
}
$j attribute status [array get cx]
lappend result $j
}
return $result
}
#########################################################################
proc show {args} {
puts stderr $args
}
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