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| #!/bin/bash | |
| # check_ddos Nagios plugin | |
| # | |
| # Options : | |
| # -w/--warning) | |
| # Warning value (number of SYN_RECV) | |
| # | |
| # -c/--critical) | |
| # Critical value (number of SYN_RECV) | |
| STATE_OK=0 | |
| STATE_WARNING=1 | |
| STATE_CRITICAL=2 | |
| STATE_UNKNOWN=3 | |
| STATE_DEPENDENT=4 | |
| while test -n "$1"; do | |
| case "$1" in | |
| --warning|-w) | |
| OPT_WARN=$2 | |
| shift | |
| ;; | |
| --critical|-c) | |
| OPT_CRIT=$2 | |
| shift | |
| ;; | |
| *) | |
| echo "Unknown argument: $1" | |
| exit $STATE_UNKNOWN | |
| ;; | |
| esac | |
| shift | |
| done | |
| OPT_WARN=${OPT_WARN:=50} | |
| OPT_CRIT=${OPT_CRIT:=70} | |
| FILENAME='/tmp/check_ddos' | |
| trap "rm -f $FILENAME; exit" EXIT | |
| netstat -an > $FILENAME | |
| DDOS=$(grep SYN_RECV $FILENAME | wc -l) | |
| PERFDATA=$(grep SYN_RECV $FILENAME | awk {'print $5'} | cut -f 1 -d ":" | sort | uniq -c | sort -k1,1rn | head -10) | |
| EXITSTATUS=$STATE_UNKNOWN | |
| if [ "$DDOS" -ge "$OPT_WARN" ]; then | |
| EXITSTATUS=$STATE_WARNING | |
| if [ "$DDOS" -ge "$OPT_CRIT" ]; then | |
| EXITSTATUS=$STATE_CRITICAL | |
| fi | |
| echo "DDOS attack !" | |
| echo "Top 10 SYN_RECV sources :" | |
| echo "$PERFDATA" | |
| else | |
| echo "No DDOS detected ($DDOS / $OPT_WARN)" | |
| EXITSTATUS=$STATE_OK | |
| fi | |
| exit $EXITSTATUS |
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