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Re: Testing firewall ports with parallel


From: Hans Schou
Subject: Re: Testing firewall ports with parallel
Date: Fri, 19 Jan 2018 00:19:59 +0100

You could have all your hosts and ports in a file and pass that to parallel.

File "dst_hosts" containing:
  cloud-ec.amp.cisco.com 443
  cloud-ec.amp.cisco.com 32137
  console.ampo.cisco.com 443

And then run:
  parallel -P 0 nc -w 2 -vz < dst_hosts

Or with 'cat':
  cat dst_hosts | parallel -P 0 nc -w 2 -vz


2018-01-18 18:55 GMT+01:00 Divan Santana <address@hidden>:
Hi all,

Like a lot of GNU software parallel is awesome.

Need help, am trying to test if servers we manage have the required
firewall ports open. Have tried a few things but am not winning so far.

This works, but is quite terrible and inefficient. Sure it could be
simpler and better.

How can I achieve the below equivalent in a better way?

NOTE: I only want to test particular ports for a specific host. Hence I
used an associated array in bash.

  #!/usr/bin/env bash

  declare -A dst_hosts
  dst_hosts=(
      [cloud-ec.amp.cisco.com]='443 32137'
      [console.amp.cisco.com]='443'
      [mgmt.amp.cisco.com]='443'
      [intake.amp.cisco.com]='443'
      [policy.amp.cisco.com]='443'
      [crash.amp.cisco.com]='443'
      [ioc-schema.amp.cisco.com]='443'
      [api.amp.cisco.com]='443'
      [sourcefire-apps.s3.amazonaws.com]='443'
      [update.immunet.com]='80 443'
      [defs.amp.sourcefire.com]='80 443'
      [cloud-ec-asn.amp.sourcefire.com]='443'
      [cloud-ec-est.amp.sourcefire.com]='443'
      [android.amp.sourcefire.com]='443'
      [cloud-pc.amp.sourcefire.com]='443 32137'
      [packages.amp.sourcefire.com]='443'
      [support-sessions.amp.sourcefire.com]='443'
      [cloud-dc.amp.sourcefire.com]='443 32137'
      [export.amp.sourcefire.com]='443'
      [intel.api.sourcefire.com]='443'
  )

  for dst_host in "address@hidden"; do
      parallel -P 0 nc -w 2 -vz ${dst_host} ::: ${dst_hosts[$dst_host]} ;
  done

Also, ideally I could use parallel to do the above test in parallel on
multiple hosts.
--
Divan



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