Testing firewall ports with parallel

[Divan Santana]

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 "${!dst_hosts[@]}"; 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