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Script: Sekündlicher NMAP-Check

SNIPPET_TEXT:

1. #!/bin/bash
2.  
3. export LC_ALL=C
4. export PATH=/bin:/sbin:/usr/bin:/usr/sbin
5. declare -A state
6. declare -A state_changed
7.  
8. state_dir=/dev/shm/nmap_state
9. hosts=(192.168.12.2 192.168.12.6 192.168.12.9 192.168.12.10 192.168.12.125 192.168.12.200 192.168.12.203 192.168.12.204 192.168.12.205 192.168.12.206 192.168.12.207 192.168.12.208 192.168.12.209 192.168.12.211 192.168.12.212 192.168.12.213 192.168.12.215 192.168.12.225 192.168.12.226 192.168.12.230)
10. tcp_port=502
11. state_name[0]=UP
12. state_name[1]=DOWN
13.  
14. declare -x state hosts tcp_port PATH LC_ALL state_changed state_dir
15.  
16. check_port() {
17.         local host="$1"
18.         local port="$2"
19.         nmap -p$port $host 2>&1 | grep -q "$tcp_port/tcp open"
20.         echo $? >$state_dir/$host
21. }
22.  
23. mylog() {
24.         echo "$(date) : $1"
25. }
26.  
27. mkdir -p $state_dir
28. while :;do
29.         for host in ${hosts[@]}; do
30.                 {
31.                 state_changed[$host]=0
32.                 check_port $host $tcp_port
33.                 } &
34.         done
35.         wait
36.         for host in ${hosts[@]};do
37.                 new_state="$(cat $state_dir/$host)"
38.                 if [ "${state[$host]}" != "$new_state" ]; then
39.                         state_text=${state_name[$new_state]}
40.                         mylog "new state for host $host: $state_text"
41.                         state[$host]=$new_state
42.                 fi
43.         done
44.         sleep 1
45. done

Quellcode

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