checkMemory.sh

Nombre: checkMemory.sh
Autor: Cristian Hernandez
Descripcion: Monitorea el uso total de la memoria.

#!/bin/bash
#===============================================================================
# Author:
#               Cristian Hernandez

#===============================================================================
#
# Description:
#           Monitor total memory usage.
#
# Parameters:
#       -w: Warning threshold (in percentiles)
#       -c: Critical threshold (in percentiles)
#       -h: Help message
#
#===============================================================================

#
# FUNCTIONS:
#
#-------------------------------------------------------------------------------
# Check CPU activity. Returns OK, WARNING or CRITICAL status based on command
# line arguments
function check_memory() {
    local warning=$1
    local critical=$2
    local results=($(free -m | awk 'BEGIN {
                total=0;
                rss=0
            }
            {
                if ($1 == "Mem:") {
                    total=$2; # Memory total
                    vmz=$3;   # Memory in use (VMZ)
                }
                if ($1 == "-/+") {
                    rss=$3         # Memory in use (RSS)
                    cache=vmz-$3;  # Memory in cache
                }
            }
            END {
                # Return array of results: [percent_memory_used, memory_in_cache]
                print int(rss/total*100), cache

            }'))

    echo "Current:${results[0]} Threshold:[${warning}/${critical}]% Cache:${results[1]}MB"
    # Check status and exit accordingly
    [ "${results[0]}" -gt "$critical" ] && exit 2
    [ "${results[0]}" -gt "$warning" ] && exit 1

    exit 0

}

#-------------------------------------------------------------------------------

# Help message
function usage() {
    echo "Usage:
    -w: Warning threshold (in percentiles, i.e. from 0 to 100)
    -c: Critical threshold (in percentiles, i.e. from 0 to 100)
    -h: This Help message

    Example: $0 -w 70 -c 90"
}

#-------------------------------------------------------------------------------

#
# MAIN:
#

#-------------------------------------------------------------------------------

# Check command line options

while getopts 'c:w:h' OPT
do
    case $OPT in
        w) warning=${OPTARG}
        ;;
        c) critical=${OPTARG}
        ;;
        h) usage && exit 1
        ;;
    esac
done

# Validate command line arguments
if [ $# -eq 4 ]; then
    if [ "$critical" -gt "$warning" ]; then
        # Check memory usage and exit accordingly
        check_memory $warning $critical
    else
        echo "ERROR: critical threshold must be greater than warning threshold"
        usage
        exit 1
    fi
else
    echo "ERROR: Missing argument!"
    usage
    exit 1
fi

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iptables-rules-generator.sh

Nombre: iptables-rule-generator.sh
Autor: Ricardo del Castillo @WizardIP
Descripcion: Generador básico de reglas de IPTables por puerto, interface, dirección IP o segmento para colocar en el archivo generado por el comando iptables-save.

#!/bin/bash 

#@WizardIP

if [ $# -lt 1 ] 
then 
        echo "Usage : $0 [ OPTION  ]" 
        echo "Options are:" 
        echo "by Port" 
        echo "by Interface" 
        echo "by Address (Full Access)" 
        echo "by Segment" 
        exit 1 
fi 

NUM='^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$' 
NUM2='^-?[0-9]+$' 
case "$1" in 

P) 
echo "Give me the IP" 
        read IP 
        if ! [[ $IP =~ $NUM ]]; then 
                echo "Please use numeric values" 
                exit 1 
        fi 
echo "Give me the Port" 
        read PORT 
        if ! [[ $PORT =~ $NUM2 ]]; then 
                echo "Please use numeric values" 
                exit 1 
        fi 
echo "Generating Rules...Please append it in the config file /etc/iptables.rules.date" 
sleep 3 
echo "-A INPUT -s $IP/32 -p tcp -m tcp --dport $PORT -j ACCEPT" 
echo "-A OUTPUT -d $IP/32 -p tcp -m tcp --sport $PORT -j ACCEPT" 
;; 

I) 
echo "Give me the Interface" 
        read INTER 
echo "Give me the IP" 
        read IP 
        if ! [[ $IP =~ $NUM ]]; then 
                echo "Please use numeric values" 
                exit 1 
        fi 
echo "Generating rules...Please append it in the config file /etc/iptables.rules.date" 
sleep 3 
echo "-A INPUT -i $INTER -p tcp -s $IP/32 -j ACCEPT" 
echo "-A OUTPUT -o $INTER -p tcp -d $IP/32 -j ACCEPT" 
;; 

A) 
echo "Give me the IP" 
        read IP 
        if ! [[ $IP =~ $NUM ]]; then 
                echo "Please use numeric values" 
                exit 1 
        fi 
echo "Generating rules...Please append it in the config file /etc/iptables.rules.date" 
sleep 3 
echo "-A INPUT -s $IP -j ACCEPT" 
echo "-A OUTPUT -d $IP -j ACCEPT" 
;; 

S) 
echo "Give me the IP" 
        read IP 
        if ! [[ $IP =~ $NUM ]]; then 
                echo "Please use numeric values" 
                exit 1 
        fi 
echo "Give me the Interface" 
        read INTER 
echo "Generating rules...Please append it in the config file /etc/iptables.rules.date" 
sleep 3 
echo "-A INPUT -i $INTER -s $IP/24 -j ACCEPT" 
echo "-A OUTPUT -o $INTER -d $IP/24 -j ACCEPT" 
;; 

*) 
echo "Invalid option" 
echo "Usage : $0 [ OPTION  ]" 
        echo "Options are:" 
        echo "by Port" 
        echo "by Interface" 
        echo "by Address" 
        echo "by Segment" 
        exit 1 
;; 
esac 

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