SSH Pre-Login Banner for 0xFF Funkfeuer EdgeRouter Logins

0xffedgebanner.sh

#!/bin/bash
# check if exists:  
# grep -A 4 banner /config/config.boot | grep pre-login | grep ",---.,---.,---.,---.." | wc -l
#
# INSTALL/UPDATE via CLI: 
# curl -sS https://gist.githubusercontent.com/pocki80/e4c2c16c5c1b8886c8320446768a862f/raw/0xffedgebanner.sh | sudo bash

location=$(echo -n $(grep -A 8 snmp /config/config.boot | grep location | sed "s/location//g" | sed "s/\"//g"))
contact=$(echo -n $(grep -A 8 snmp /config/config.boot | grep contact | sed "s/contact//g" | sed "s/\"//g"))
#serial=$(ip -6 link show eth0 | grep link/ether | awk {'print toupper($2)'})
serial=$(/usr/sbin/ubnt-hal show-version | grep "HW S/N" | awk '{print $3}' | sed 's/.\{2\}/&:/g' | sed 's/:$//g')
hostname=$(hostname)

# apply banner if missing or wrong snmp data inside
if [ $(grep -A 4 banner /config/config.boot | grep pre-login | grep ",---.,---.,---.,---.." | wc -l) -eq 0 ] ||
   [ $(grep -A 4 banner /config/config.boot | grep pre-login | grep ":: $hostname ::" | wc -l) -eq 0 ] ||
   [ $(grep -A 4 banner /config/config.boot | grep pre-login | grep "Location: $location" | wc -l) -eq 0 ] ||
   [ $(grep -A 4 banner /config/config.boot | grep pre-login | grep "SerialNo: $serial" | wc -l) -eq 0 ] ||
   [ $(grep -A 4 banner /config/config.boot | grep pre-login | grep "Contact : $contact" | wc -l) -eq 0 ]; then 
cmd="/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper"
bannertext="Welcome to EdgeOS\n"
bannertext=$bannertext"          |                         |\n"
bannertext=$bannertext" ,---.,---|,---.,---.,---.,---..   .|--- ,---.,---.\n"
bannertext=$bannertext" |---\`|   ||   ||---\`|    |   ||   ||    |---\`|\n"
bannertext=$bannertext" \`---\`\`---\`\`---|\`---\`\`    \`---\`\`---\`\`--- \`---\`\`\n"
bannertext=$bannertext"           \`---\`      :: "$hostname" ::\n"
[ "$location" ] && bannertext=$bannertext"   Location: "$location"\n"
[ "$contact" ] && bannertext=$bannertext"   Contact : "$contact"\n"
[ "$serial" ] && bannertext=$bannertext"   SerialNo: "$serial"\n"
bannertext=$bannertext"\n\n\n"
tfile=$(mktemp)
(
$cmd begin
ret=0
if [ $ret == 0 ]; then
$cmd delete system login banner pre-login || ret=1
fi
if [ $ret == 0 ]; then
$cmd set    system login banner pre-login "$bannertext" || ret=1
fi
if [ $ret == 0 ]; then
$cmd commit || ret=1
fi
if [ $ret == 0 ]; then
$cmd save || ret=1
fi
$cmd end
exit $ret
) >$tfile 2>&1
ret=$?
output=$(cat $tfile)
rm -f $tfile
  echo "Banner updated."
  echo $output
else
  echo "Banner was already fine."
fi

exit 0