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ee99ee2
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Joined: 18 Jun 2002
Posts: 307
Location: Murfreesboro, TN, USA
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 Posted: Wed Aug 07, 2002 8:06 pm Post subject: network ping sweep script??? |
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Would it be possable for me to write a small script that could do a ping sweep of my subnets on my network throughout the day like one an hour for a week and dump the number of reponding hosts to a file that I could then import into excel (or OpenOffice's equivlent) and graph?
Right now, I can do a ping sweep with nmap by typeing
| Code: | | nmap -sP -Pl -n 10.5.0.0/16 |
And after a few min, it'll tell me how many hosts are up on my network that repond to pings. I just need something that will automaticly do this once an hour or so and dump the number of up hosts to a file.
Any ideas? I've never proramming anything in my life, so kinda go easy on me. 
-ee99ee2
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klieber
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Joined: 17 Apr 2002
Posts: 3657
Location: San Francisco, CA
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| Posted: Wed Aug 07, 2002 8:25 pm Post subject: |
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OK, two helpful tips that should show you the way. First, how to direct the output of nmap to a file:
| Code: | | nmap -sP -Pl -n 10.5.0.0/16 > /path/to/myfile.txt |
Use ">>" instead of ">" if you want to append the data onto the end of an existing file.
Second tip: cron is your friend.  It can schedule things for you under a variety of time-based criteria, including once per hour. There's thousands of web resources on cron, as well as your Friendly Man Pages, so start there.
--kurt
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ee99ee2
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Joined: 18 Jun 2002
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Location: Murfreesboro, TN, USA
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| Posted: Sun Aug 11, 2002 10:27 am Post subject: |
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Okay that'll work, but the problem is I only need what's at the end of the results. nmap will display every host that's up.... I only need the number of hosts that's listed about 2 lines from the very bottom in the end. How can I only filter this information?
-ee99ee2
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rac
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Joined: 30 May 2002
Posts: 6553
Location: Japanifornia
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| Posted: Sun Aug 11, 2002 10:43 am Post subject: |
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| Code: | | nmap -sP -PI -n 10.5.0.0/16 | perl -ne 'print "$1\n" if /(\d+) hosts up/' |
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klieber
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Joined: 17 Apr 2002
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Location: San Francisco, CA
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| Posted: Sun Aug 11, 2002 11:35 am Post subject: |
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Or, if you don't want to use perl, the following would work:
| Code: | | nmap -sP -PI -n 10.5.0.0/16 | grep "[0-9]* hosts up" |
Or, you could use tail:
| Code: | | nmap -sP -Pl -n 10.5.0.0/16 | tail -1 |
Or theres about 43,000 other different ways you could do it as well. (sed, awk, etc.)
--kurt
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ee99ee2
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Joined: 18 Jun 2002
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Location: Murfreesboro, TN, USA
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| Posted: Mon Aug 12, 2002 1:02 am Post subject: |
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Dang... u all are good... I tried the perl thing, and I just added a >> <file name> at the end of it.... that'll work great!!!
Thanks guys!!!! woohoo!
-ee99ee2
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ee99ee2
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Joined: 18 Jun 2002
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Location: Murfreesboro, TN, USA
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| Posted: Mon Aug 12, 2002 1:10 am Post subject: |
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Hey I just had an idea. Would there be a way to also put date and time in that file to where when I import it into excel or whatever the results are in column 1, time in column 2, and the date in column 3? Just wondering....
Thanks!
-ee99ee2
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delta407
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Joined: 23 Apr 2002
Posts: 2876
Location: Chicago, IL
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| Posted: Mon Aug 12, 2002 4:49 pm Post subject: |
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This is *nix. Of course you can. 
Oh, you want to know how. Try this: (again, one of many)
| Code: | | echo `nmap -sP -PI -n 10.5.0.0/16 | perl -ne 'print "$1\n" if /(\d+) hosts? up/'`,`date +%H:%M,%Y.%m.%d` |
This produces a comma-separated file that Excel can open without modification. Included is also a bugfix that lets the script function properly when there is only one host up (the ? after hosts).
You can just stick that in your crontab to run it automatically. (man crontab) If you don't like the date/time format, man date and change it.
Oh, and since you want to keep records of this, use the >> operator to append to the existing file rather than replacing it.
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ee99ee2
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Location: Murfreesboro, TN, USA
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| Posted: Mon Aug 12, 2002 10:49 pm Post subject: |
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hehe.... a bug fix.... hahah.... thanks!!! 
-ee99ee2
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