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soymanue's avatar
soymanue
Icon for Nimbostratus rankNimbostratus
Oct 12, 2012

Hostname split

Hello   I need to split a hostname into three parts ( ..).   This can be done al least on two ways:   1) scan [HTTP::host] %\[^.\].%\[^.\].%s prefix host suffix     2) set prefix [ge...
application delivery
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devops
iRules
nitass's avatar
nitass
Icon for Employee rankEmployee
Oct 12, 2012
i like Kevin's idea. 

[root@ve10:Active] config  b rule myrule list
rule myrule {
   when RULE_INIT {
   set hostname "f5.com"
   set lhostname [split $hostname "."]
   set suffix [lindex $lhostname [expr {[llength $lhostname] - 1}]]
   set host [lindex $lhostname [expr {[llength $lhostname] - 2}]]
   set prefix [lindex $lhostname [expr {[llength $lhostname] - 3}]]
   for {set i [expr {[llength $lhostname] - 4}]} {$i >= 0} {incr i -1} {
      set prefix "[lindex $lhostname $i].$prefix"
   }
   log local0. "hostname=$hostname | prefix=$prefix | host=$host | suffix=$suffix"

   set hostname "www.f5.com"
   set lhostname [split $hostname "."]
   set suffix [lindex $lhostname [expr {[llength $lhostname] - 1}]]
   set host [lindex $lhostname [expr {[llength $lhostname] - 2}]]
   set prefix [lindex $lhostname [expr {[llength $lhostname] - 3}]]
   for {set i [expr {[llength $lhostname] - 4}]} {$i >= 0} {incr i -1} {
      set prefix "[lindex $lhostname $i].$prefix"
   }
   log local0. "hostname=$hostname | prefix=$prefix | host=$host | suffix=$suffix"

   set hostname "xxx.yyy.f5.com"
   set lhostname [split $hostname "."]
   set suffix [lindex $lhostname [expr {[llength $lhostname] - 1}]]
   set host [lindex $lhostname [expr {[llength $lhostname] - 2}]]
   set prefix [lindex $lhostname [expr {[llength $lhostname] - 3}]]
   for {set i [expr {[llength $lhostname] - 4}]} {$i >= 0} {incr i -1} {
      set prefix "[lindex $lhostname $i].$prefix"
   }
   log local0. "hostname=$hostname | prefix=$prefix | host=$host | suffix=$suffix"
}
}

[root@ve10:Active] config  tail -f /var/log/ltm
Oct 12 19:58:52 local/ve10 err mcpd[3815]: 01020066:3: The requested rule (myrule) already exists in partition Common.
Oct 12 19:58:52 local/tmm info tmm[7926]: Rule myrule : hostname=f5.com | prefix= | host=f5 | suffix=com
Oct 12 19:58:52 local/tmm info tmm[7926]: Rule myrule : hostname=www.f5.com | prefix=www | host=f5 | suffix=com
Oct 12 19:58:52 local/tmm info tmm[7926]: Rule myrule : hostname=xxx.yyy.f5.com | prefix=xxx.yyy | host=f5 | suffix=com