Set ARKIME_NODE_HOST from OS_HOST interface rather than default route

[divinehawk]

When using Hedgehog that has an OOB/VPN connection, ARKIME_NODE_HOST is set incorrectly to the IP address of the default gateway interface.

This patch will use the IP interface of the route for the OS_HOST, if set, rather than the default.

[mmguero]

Thanks, that makes sense. I'll get this pulled in to my development branch for the next release. See mmguero-dev/Malcolm@ef5e672

[mmguero]

I ended up tweaking it just a bit for cases where OS_HOST isn't already an IP address (i.e., it's a hostname):

Here's what I ended up on for that logic:

  ROUTE_DEST_IP=
  if [[ -n "$OS_HOST" ]]; then
    if [[ "$OS_HOST" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
      ROUTE_DEST_IP="$OS_HOST"
    else
      ROUTE_DEST_IP=$(dig +short "$OS_HOST" 2>/dev/null | head -n 1)
    fi
  fi
  [[ -n "$ROUTE_DEST_IP" ]] || ROUTE_DEST_IP=255.255.255.255
  PRIMARY_IP=$(ip route get "$ROUTE_DEST_IP" | grep -Po '(?<=src )(\d{1,3}.){4}' | sed "s/ //g")

Thanks for the find!

[divinehawk]

Updated this pull request just in case. Should I close it out?

[mmguero]

I've got already your commits pulled in to my development fork which is where I'll stage the release from, so this PR could be closed, but it's fine to just leave it open until I put the next release out.

[mmguero]

prepping for release, your commits have been pulled in manually. closing this PR.