Simple Nagios status.dat parser with static fields. Receives host name regex.

nagios_host_state.sh

#!/bin/bash
get_regex(){
        awk -v R="$1" 'BEGIN {RS="\n\n"; FS="\n";}
                {
                        if ($1=="hoststatus {" && match($2, "^\thost_name="R))
                        print $2
                };' /var/cache/nagios3/status.dat | sed "s#[\t ][\t ]*[^=]*=# #g; s# ##"
}

# output - <type=service>:<host_name>:<service_description>:<sec since last_check>:<sec since last_state_change>:<current_state>
#    e.g - host:nodePub-alg-08b78d20264fd34a8:79:107:1
get_services(){
        awk 'BEGIN {RS="\n\n"; FS="\n";}
                {if ($1=="servicestatus {" && $2=="\thost_name=""'"$1"'")
                        print $2"\t"$3"\t"$16"\t"$34"\t"$25};' /var/cache/nagios3/status.dat |\
                sed "s# #::#g; s#[\t ][\t ]*[^=]*=# #g; s# ##" | while read h n s t c; do
                        echo "service:$h:${n//::/ }:$((`date +%s`-$t)):$((`date +%s`-$c)):$s"
                done
}

# output - <type=host>:<host_name>:<sec since last_check>:<sec since last_state_change>:<current_state>
#    e.g - host:nodePub-alg-08b78d20264fd34a8:79:107:1
get_host(){
        awk 'BEGIN {RS="\n\n"; FS="\n";}
                {if ($1=="hoststatus {" && $2=="\thost_name=""'"$1"'")
                        print $2" "$15" "$24" "$30};' /var/cache/nagios3/status.dat |\
                sed "s#[\t ][\t ]*[^=]*=# #g; s# ##" | while read h s t c; do
                        echo "host:$h:$((`date +%s`-$t)):$((`date +%s`-$c)):$s"
                done
}

for host in `get_regex $1`; do
        get_host $host
        get_services $host
done