iankelling.org Git - distro-setup/blob - vpn-mail-forward

   1 #!/bin/bash
   2
   3 set -eE -o pipefail
   4 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
   5
   6 do-forward() {
   7     cmd=$1; shift
   8     for port; do
   9         /sbin/iptables -t nat $cmd PREROUTING -i eth0 -p tcp -m tcp --dport $port -j DNAT --to-destination 10.8.0.4:$port
  10     done
  11 }
  12
  13 ports=(25 143)
  14 case $1 in
  15     start)
  16         do-forward -A ${ports[@]}
  17         ;;
  18     stop)
  19         do-forward -D ${ports[@]}
  20         ;;
  21     *)
  22         echo "$0: error: expected 1 argument of start or stop"
  23         exit 1
  24         ;;
  25 esac