Heesob Park
8/6/2008 7:08:00 AM
Hi,
2008/8/6 ga rg <khurrum1@gmail.com>:
> I'm in an environment with a lot of computers that haven't been
> properly inventoried. Basically, no one knows which IP goes with which
> mac address and which hostname. So I wrote the following:
>
> # This script goes down the entire IP range and attempts to
> # retrieve the Hostname and mac address and outputs them
> # into a file. Yay!
>
> require "socket"
>
> TwoOctets = "10.26"
>
> def computer_exists?(computerip)
> system("ping -c 1 -W 1 #{computerip}")
> end
>
> def append_to_file(line)
> file = File.open("output.txt", "a")
> file.puts(line)
> file.close
> end
>
>
> def getInfo(current_ip)
> begin
> if computer_exists?(current_ip)
> arp_output = `arp -v #{current_ip}`
> mac_addr = arp_output.to_s.match(/..:..:..:..:..:../)
> host_name = Socket.gethostbyname(current_ip)
> append_to_file("#{host_name[0]} - #{current_ip} - #{mac_addr}\n")
> end
> rescue SocketError => mySocketError
> append_to_file("unknown - #{current_ip} - #{mac_addr}")
> end
> end
>
>
> (6..8).each do |i|
> case i
> when 6
> for j in (1..190)
> current_ip = "#{TwoOctets}.#{i}.#{j}"
> getInfo(current_ip)
> end
> when 7
> for j in (1..255)
> current_ip = "#{TwoOctets}.#{i}.#{j}"
> getInfo(current_ip)
> end
> when 8
> for j in (1..52)
> current_ip = "#{TwoOctets}.#{i}.#{j}"
> getInfo(current_ip)
> end
> end
> end
>
>
> Everything works except it does not find a Reverse DNS.
>
> Sample output that I'm getting is this:
>
> 10.26.6.12 - 10.26.6.12 - 00:11:11:9B:13:9F
> 10.26.6.17 - 10.26.6.17 - 08:00:69:9A:97:C3
> 10.26.6.18 - 10.26.6.18 - 08:00:69:93:2C:E2
>
> If I do `nslookup 10.26.6.12` then I get the correct reverse DNS so
> that shows that my machine is seeing the dns server.
>
> I have tried Socket.gethostbyname, gethostbyaddr, but it doesn't work :
> (
>
> Any guidance will be much appreciated. Thanks!
>
Try getaddrinfo like this:
s = Socket.getaddrinfo('10.26.6.12',nil)
hostname = s[0][2]
Regards,
Park Heesob