To be clear... I gave up on the SG200, and replaced it with a cheap-on-ebay SG250. I simply didn't have the patience to deal with the SG200.
But, I did write a script that seemed to work. Have fun. (It didn't paste correctly with indents, but I think you can figure it out)
#! /bin/bash
# Obtain statistics for Cisco SG200 and output as standard Nagios plugin
# Grabo 2018-11-04; updated 2019-01-18
# usage: sg200.sh -d=[device] -u=[username] -p=[password]
#bail on any error
set -e
for i in "$@"
do
case $i in
-d=*)
device="${i#*=}"
shift
;;
-u=*)
username="${i#*=}"
shift
;;
-p=*)
passraw="${i#*=}"
shift
;;
*)
;;
esac
done
password=$(echo -n $passraw | base64) #need to convert password to base64
base=$(mktemp -u).sg200.$device #suitable temp file storage
#login and get cookies
curl -s -c $base.cookies -d "uname=$username&pwd2=$password" http://$device/nikola_login.html -o /dev/null
#bail if we didn't get cookies
if [ ! -f $base.cookies ]; then
exit 1
fi
#from this point forward, no error checking, fingers crossed
# basics - hostname and uptime
curl -s -b $base.cookies http://$device/SetupSystemSummary.html -o $base.summary
# hostname
output="sg200|hostname="$(grep NAME=v_1_5_1 $base.summary | cut -d '"' -f2)
# uptime
output+=" sysUpTime="$(grep v_1_2_2 $base.summary | cut -d '"' -f2 | awk '{print 100*($1*86400+$3*3600+$5*60+$7)}')
# cpu and memory
curl -s -b $base.cookies http://$device/DiagnosticsCPUUtilization.html -o $base.diag
# cpu 1min
output+=" cpu1min="$(grep -i v_1_5_1 $base.diag | cut -d '"' -f2)
# cpu 5min
output+=" cpu5min="$(grep -i v_1_6_1 $base.diag | cut -d '"' -f2)
# free mem
output+=" freemem="$(grep -i v_1_9_1 $base.diag | cut -d '"' -f2)
# alloc mem
output+=" allocmem="$(grep -i v_1_8_1 $base.diag | cut -d '"' -f2)
#interface stats
for i in 1 2 3 4 5 8
do
curl -s -b $base.cookies -d "v_1_23_1=g$i&submit_target=StatisticsInterface.html" http://$device/StatisticsInterface.html/a1 -o $base.g$i
output+=" g"$i"tx="$(grep v_1_12_1 $base.g$i | cut -d '"' -f2)
output+=" g"$i"rx="$(grep v_1_3_1 $base.g$i | cut -d '"' -f2)
done
echo $output
#logout
curl -s -b $base.cookies -d "language_selector_withAddOption=en-US&err_flag=0&err_msg=&mainpage=nikola_main.html&loginpage=nikola_login.html&submit_flag=8" http://$device/nikola_main.html -o /dev/null
rm -f $base.*
