mdw@git.distorted.org.uk Git - tunneluser/blob - bin/init

   1 #! /bin/sh
   2
   3 ### BEGIN INIT INFO
   4 # Provides:          tunnel
   5 # Required-Start:    $remote_fs $syslog
   6 # Required-Stop:     $remote_fs $syslog
   7 # Default-Start:     2 3 4 5
   8 # Default-Stop:      0 1 6
   9 # Short-Description: Outbound SSH tunnels
  10 # Description:       This script starts or stops the outbound SSH tunnels
  11 #                       maintained by the `tunnel' user.
  12 ### END INIT INFO
  13
  14 # Author: Mark Wooding <mdw@distorted.org.uk>
  15
  16 ## Initial configuration.
  17 PATH=/sbin:/usr/sbin:/bin:/usr/bin
  18 DESC="outbound SSH tunnels"
  19 TUNUSER=tunnel
  20 RUN=/var/run/$TUNUSER
  21 if [ -f /etc/default/tunnel ]; then . /etc/default/tunnel; fi
  22 : ${TUNHOME=$(getent passwd "$TUNUSER" | cut -d: -f6)}
  23 : ${TUNGROUP=$(id -g "$TUNUSER")}
  24 if [ ! -x "$TUNHOME/bin/outbound" ]; then exit 0; fi
  25 : ${tunnels=$(sed -n \
  26   '/^Host[[:space:]]\+\([^[:space:]*]\|[^[:space:]].*[^[:space:]]\)[[:space:]]*$/s//\1/p' \
  27   "$TUNHOME/.ssh/config")}
  28
  29 ## Scan the command-line.
  30 case "$#" in
  31   0) op=none ;;
  32   1) op=$1; shift; set -- $tunnels ;;
  33   *) op=$1; shift ;;
  34 esac
  35
  36 ## Make sure that the runtime state directory exists.  If not, create it with
  37 ## sensible permissions.  Don't override permissions if it already exists,
  38 ## because presumably the administrator has fiddled them deliberately.
  39 if [ ! -d "$RUN" ]; then
  40   mkdir -m755 "$RUN"
  41   chown "$TUNUSER:$TUNGROUP" "$RUN"
  42 fi
  43 cd "$RUN"
  44
  45 ## Utility to run the per-host script.
  46 run_outbound () { sudo -u"$TUNUSER" "$TUNHOME/bin/outbound" "$@"; }
  47
  48 ## Utilities for doing things to individual hosts.
  49 start () { run_outbound start "$1"; }
  50 stop () { run_outbound stop "$1"; }
  51 restart () { stop "$1"; start "$1"; }
  52
  53 ## Higher-order iterator to process a list of hosts.
  54 foreach () {
  55   whatting=$1 what=$2; shift 2
  56   echo -n "$whatting $DESC:"
  57   for i in "$@"; do
  58     $what "$i"
  59     echo -n " $i"
  60   done
  61   echo "."
  62 }
  63
  64 ## Main dispatch.
  65 case $op in
  66   start) foreach "Starting" start "$@" ;;
  67   stop) foreach "Stopping" stop "$@" ;;
  68   restart | force-reload) foreach "Restarting" restart "$@" ;;
  69   status)
  70     for i in "$@"; do
  71       echo -n "$i: "
  72       run_outbound status "$i"
  73     done
  74     ;;
  75   *)
  76     echo >&2 "usage: $0 {start|stop|restart|status} [HOST ...]"
  77     exit 1
  78     ;;
  79 esac