sclimon/sclimon

#!/bin/bash
SCLIMONDIR="$HOME/.config/sclimon"
PIDFILE=$HOME/.sclimon.pid

# Create $HOME-User directories and empty config file
mkdir -p $SCLIMONDIR/{conf,flags}
touch $SCLIMONDIR/config

# trap ctrl-c key stroke and call CTRL_C function to exit and clear Shell
trap CTRL_C INT

function CTRL_C() {
  tput clear
  tput cnorm
  rm $PIDFILE
  exit 0
}

usage()
{
cat <<EOF
Usage: $(basename $0) [options]
Options:
  -a    Show all stats
  -d    Show only failed checks
  -h    Show this help page

EOF
}

while [ "$1" ]; do
  case "$1" in
    -a)
      shift
      file="$1"
      source="all"
      ;;
    -d)
      shift
      host="$1"
      source="dashboard"
      ;;
    -h)
      usage
      exit 0
      ;;
    *)
      echo "see --help for usage"
      exit 1
      ;;
  esac
  shift
done

# Path to default configuration file
source $SCLIMONDIR/config

# Text formating options
padding="                    "
TXTYELLOW=$(tput setaf 3)
TXTGREEN=$(tput setaf 2)
TXTRED=$(tput setaf 1)
TXTNORMAL=$(tput sgr0)
TXTBLINK=$(tput blink)
TXTBOLD=$(tput bold)
TXTDIM=$(tput dim)

# Mail credentials from configuration file 'config'
CREDENTIALS=$(echo -ne "\0$FROMMAIL\0$PASSWORD" | base64 | awk '{printf "AUTH PLAIN "$0}')
LOGIN="$SCLIMONDIR/login.tmp"

# Sendmail via openssl client from $FROMMAIL to $TOMAIL from the configuration file 'config'
SENDMAIL()
{
	openssl s_client -brief -tls1_2 -connect $MAILSERVER:465  < $LOGIN
}

# URL Check for *.conf files in conf/ with 'Web' TYPE
URLCHECK() {
curl -iL --silent "$PROTOCOL://$DOMAIN:$PORT" | grep -m 1 -c "$PATTERN";
}

PINGCHECK() {
ping -c 1 $HOST &> /dev/null && echo 1 || echo 0
}

SSLCHECK() {
  echo | openssl s_client -connect $DOMAIN:$PORT -servername $DOMAIN 2>/dev/null | openssl x509 -noout -text -certopt no_header,no_version,no_serial,no_signame,no_pubkey,no_sigdump,no_aux | grep Not\ After\ :| sed -e 's/.* : //g' -e 's/GMT//g';
}

PINGCHECKPO() {
  printf "${TXTDIM}%s%s%s%s %s\n" "$TITLE" "${padding:${#TITLE}}" "${TXTBOLD}${TXTGREEN}[UP]  ${TXTNORMAL}" "${padding:${#HEADLINE2}}" "$TYPE "
   if [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
     rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
   fi
}

PINGCHECKNE() {
  printf "%s%s%s%s %s\n" "$TITLE" "${padding:${#TITLE}}" "${TXTBOLD}${TXTBLINK}${TXTRED}[DOWN]${TXTNORMAL}" "${padding:${#HEADLINE2}}" "$TYPE "
    if  [ ! -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
      touch "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
    elif [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
      if [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -lt $TRESHOLD ]]; then
        date >> $SCLIMONDIR/flags/$TITLE.ALARM.flag
      elif [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -eq $TRESHOLD ]]; then
        date >> $SCLIMONDIR/flags/$TITLE.ALARM.flag
        echo $CREDENTIALS > "$SCLIMONDIR/login.tmp"
cat <<EOF >> "$SCLIMONDIR/login.tmp"
MAIL FROM: $FROMMAIL
rcpt to: $TOMAIL
DATA
From: $FROMMAIL
Subject: [Monitoring] 🚨🚨🚨 Alarm $TITLE is down

FYI: $TITLE is down since $(head -n 1 "$SCLIMONDIR/flags/$TITLE.ALARM.flag")
.
QUIT
EOF
        SENDMAIL 2&>1 >/dev/null
        rm "$SCLIMONDIR/login.tmp"
      elif [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -gt $TRESHOLD ]]; then
      :
    fi
  fi
}

WEBCHECKPO() {
  printf "${TXTDIM}%-20s%-36s%s%s %s\n" "$(echo $TITLE| cut -c1-20)"  "${TXTBOLD}${TXTGREEN}[UP]  ${TXTNORMAL}" "$TYPE "
if [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
  rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
fi
}

WEBCHECKNE() {
  printf "${TXTDIM}%-20s%-40s%s%s %s\n" "$(echo $TITLE| cut -c1-20)" "${TXTBOLD}${TXTBLINK}${TXTRED}[DOWN]${TXTNORMAL}" "$TYPE "
     if  [ ! -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
       touch "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
     elif [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
       if [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -lt $TRESHOLD ]]; then
         date >> $SCLIMONDIR/flags/$TITLE.ALARM.flag
       elif [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -eq $TRESHOLD ]]; then
         date >> $SCLIMONDIR/flags/$TITLE.ALARM.flag
         echo $CREDENTIALS > "$SCLIMONDIR/login.tmp"
cat <<EOF >> "$SCLIMONDIR/login.tmp"
MAIL FROM: $FROMMAIL
rcpt to: $TOMAIL
DATA
From: $FROMMAIL
Subject: [Monitoring] 🚨🚨🚨 Alarm $TITLE is down

FYI: $TITLE is down since $(date)
.
QUIT
EOF
      SENDMAIL 2&>1 >/dev/null
      rm "$SCLIMONDIR/login.tmp"
    elif [[ $(wc -l < $SCLIMONDIR/flags/$TITLE.ALARM.flag) -gt $TRESHOLD ]]; then
      :
   fi
fi
}

SSLMAILWARN() {
echo $CREDENTIALS > "$SCLIMONDIR/login.tmp"
cat <<EOF >> "$SCLIMONDIR/login.tmp"
MAIL FROM: $FROMMAIL
rcpt to: $TOMAIL
DATA
From: $FROMMAIL
Subject: [Monitoring] 🚨🚨🚨 Alarm CERT for $TITLE will expire

FYI: SSL Cert for $TITLE will expire in less than 8 days.
.
QUIT
EOF
SENDMAIL 2&>1 >/dev/null
rm "$SCLIMONDIR/login.tmp"
}

SSLMAILALARM() {
echo $CREDENTIALS > "$SCLIMONDIR/login.tmp"
cat <<EOF >> "$SCLIMONDIR/login.tmp"
MAIL FROM: $FROMMAIL
rcpt to: $TOMAIL
DATA
From: $FROMMAIL
Subject: [Monitoring] 🚨🚨🚨 Alarm CERT for $TITLE is expired

FYI: SSL Cert for $TITLE is expired!
.
QUIT
EOF
SENDMAIL 2&>1 >/dev/null
rm "$SCLIMONDIR/login.tmp"
}
# create Headline, run checks and format output to [HOST] [STATUS] [TYPE]. If check failed send email from mailbox in configured in config FROMMAIL to mailbox TOMAIL
COMMAND() {
HEADLINE1="HOST"
HEADLINE2="STATUS"
printf "%s%s%s%s %s\n" "$HEADLINE1" "${padding:${#HEADLINE1}}" "$HEADLINE2" "${padding:${#HEADLINE2}}" "TYPE"
printf %"$COLUMNS"s |tr " " "-"

for i in $SCLIMONDIR/conf/*.conf; do
  source $i

  if [ "$TYPE" == "Web" ]; then
    if [ "$source" == "all" ]; then
      if [ $(URLCHECK) == "1" ]; then
        WEBCHECKPO
      else
        WEBCHECKNE
      fi
    elif [ "$source" == "dashboard" ]; then
      if [ $(URLCHECK) == "1" ]; then
        if [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
          rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
          tput clear

        fi
    else
      WEBCHECKNE
    fi
  fi
fi


  if [ "$TYPE" == "Ping" ]; then
    if [ "$source" == "all" ]; then
      if [ $(PINGCHECK) == "1" ]; then
        PINGCHECKPO
      else
        PINGCHECKNE
      fi
    elif [ "$source" == "dashboard" ]; then
      if [ $(PINGCHECK) == "1" ]; then
        if [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
          rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
          tput clear
        fi
      else
        PINGCHECKNE
      fi
    fi
  fi

if [ "$TYPE" == "SSL" ]; then
  EXPIRATION=$(echo $(( ($(date -d "$(SSLCHECK)" "+%s") - $(date +%s) )/(60*60*24) )) )
    if [ "$EXPIRATION" -le "1" ]; then
      EXPCHECK="3"
    elif [ "$EXPIRATION" -le "7" ]; then
      EXPCHECK="2"
    elif [ "$EXPIRATION" -ge "7" ]; then
      EXPCHECK="1"
    fi

      if [ "$EXPCHECK" == "1" -a "$source" == "all" ]; then
         printf "${TXTDIM}%-20s%-36s%s%s %s\n" "$(echo $TITLE| cut -c1-20)"  "${TXTBOLD}${TXTGREEN}[OK]  ${TXTNORMAL}" "$TYPE "
        if [[ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag || -f $SCLIMONDIR/flags/$TITLE.WARN.flag ]]; then
         rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
         rm "$SCLIMONDIR/flags/$TITLE.WARN.flag"
        fi

      elif [ "$EXPCHECK" == "2" ]; then
        printf "${TXTDIM}%-20s%-36s%s%s %s\n" "$(echo $TITLE| cut -c1-20)" "${TXTBOLD}${TXTYELLOW}[EXPIRES IN "$EXPIRATION"d] ${TXTNORMAL}" "$TYPE "
        if  [ ! -f $SCLIMONDIR/flags/$TITLE.WARN.flag ]; then
          SSLMAILWARN
        fi
      touch "$SCLIMONDIR/flags/$TITLE.WARN.flag"

      elif [ "$EXPCHECK" == "3" ]; then
        printf "%-20s%-40s%s%s %s\n" "$(echo $TITLE| cut -c1-20)" "${TXTBOLD}${TXTBLINK}${TXTRED}[EXPIRED]${TXTNORMAL}" "$TYPE "
          if  [ ! -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
            SSLMAILALARM
          fi
        touch "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
      elif [ "$EXPCHECK" == "1" -a "$source" == "dashboard" ]; then
        if [ -f $SCLIMONDIR/flags/$TITLE.ALARM.flag ]; then
         rm "$SCLIMONDIR/flags/$TITLE.ALARM.flag"
         tput clear
       fi
      fi
    fi

done | sed -e 's/^.*\[DOWN/0&/' -e 's/^.*\[EXPIRED/0&/' -e t -e 's/^.*EXPIRES/1&/' -e 's/^.*\[GOOD/3&/' -e 't' -e 's/^/2/' | sort | sed 's/^.//'
}

# Create PID File and check if process is running. In case Sclimon is already running show messages and exit.
if [ -f $PIDFILE ]; then
  PID=$(cat $PIDFILE)
  ps -p $PID > /dev/null 2>&1
  if [ $? -eq 0 ]; then
    echo "Sclimon already running. Quit Sclimon or delete $PIDFILE"
    exit 1
  fi
else
  echo $$ > $PIDFILE
fi

# Check if the config file exists and Options are set. Delay will be default set to 10s if nothing is configured.
# Also check if mail config are set and inform before start.
# After the starup check run the monitoring tool in a loop and check again after the delay time.
if [ ! -f $HOME/.config/sclimon/config ]; then
  echo -e "There is no $HOME/.config/sclimon/config file.\nPlease create config file and set options."
    else
      if [ -z "$DELAY" ]; then
        DELAY="10"
      fi
      if [ -z "$TRESHOLD" ]; then
        TRESHOLD="5"
      fi
      if [[ -z "$FROMMAIL" || -z "$MAILSERVER" || -z "$PASSWORD" || -z "$TOMAIL" ]]; then
        echo -e "Mail cofiguration are not set in $HOME/.config/sclimon/config.\nPlease set FROMMAIL, MAILSERVER, PASSWORD, TOMAIL to be informed about of downtimes.\nMonitoring will start in 10 seconds."
        sleep 10;
      fi
      if [ ! -f $SCLIMONDIR/conf/*.conf ]; then
        echo -e "There are no config files in $SCLIMONDIR/conf.\nPlease create a <name>.conf to be loaded."
        exit 0
      fi
        tput clear
        tput civis
        while true; do
          tput cup 0 0
          COMMAND
          sleep $DELAY
        done
      fi
fi