I have a tricky problem, and I'm quite the scripting newb.
I have Cisco ACLs that have IP addresses in them. I'd like to convert the IP's to hostnames for easier analysis. A sample ACL input file would be (I've obfuscated the IPs):
Code:
access-list acl-secure-out line 1 extended permit icmp any any
access-list acl-secure-out line 2 extended permit tcp host 200.00.000.000 object-group ser-secure-bed eq 2049
access-list acl-secure-out line 2 extended permit tcp host 200.00.000.000 host 10.0.000.1 eq 2049
Here is the trick - I only want to convert host IPs - so, any IP that follows the word 'host' in the ACL (which I have as a text file).
For some reason, the system command output prints out before the whole line, and munges up the line output (see '00ess-list' at the beginning of the 3rd line). I know that command wouldn't do exactly what I wanted, but I think I'm close.
The system command is working OK - it's looking up the hostname just fine, I just need to find a way to do that, and replace the IP in the line with the hostname, but only when the IP is preceded by the word 'host'.
I want to make a script to read a list of ip addresses from a file then convert those ip addresses to ip number.
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edit; I found a solution that works, see thread #3 https://www.unix.com/302417065-post3.html
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Anyone can help?
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Discussion started by: fspalero
2 Replies
LEARN ABOUT ULTRIX
ethers
ethers(5) File Formats Manual ethers(5)Name
ethers - database that maps Ethernet addresses to hostnames
Description
The file is used in conjunction with the reverse address resolution protocol daemon, to map Ethernet addresses to hostnames. It contains
information about the known (48-bit) Ethernet addresses of hosts on the Internet.
For each host on an Ethernet, a single line should be present in the file with the following information:
Ethernet-address official-host-name
Items are separated by one or more spaces or tabs. A number sign (#) indicates the beginning of a comment that extends to the end of line.
The standard form for Ethernet addresses is:
x:x:x:x:x:x
The x is a hexadecimal number between 0 and ff, representing 1 byte. The address bytes are always in network order.
Hostnames can contain any printable character other than a space, tab, newline, or number sign (#).
Hostnames in the file should correspond to the hostnames in the file or to those provided by the name service.
Examples
The following is a sample file: 08:00:20:01:e5:1c host1 # Comments go here 08:00:20:01:d0:4c host2 # Comments go
here 08:00:20:01:e0:1d host3 # Comments go here 08:00:20:00:c2:4e host4 # Comments go here
See Alsoethers(3n), hosts(5), rarpd(8c)
Introduction to Networking and Distributed System Services
ethers(5)
02-25-2010
Any thoughts?