#! /bin/bash## Starts redirecting tcp connections from the internet to the local network## Exits on failureset -e# Default paths and optionsDAEMON="/usr/bin/redir"DAEMON_OPTS="--lport 8888 --cport 8888 --caddr 192.168.0.170"# Check if daemon is executable, otherwise exit scripttest -x $DAEMON || exit 0# Load standard text functions. /lib/lsb/init-functions# Fill in a default pid of 1 if pidfile doesn't exist yetif [ ! -e /var/run/redir.pid ]; then echo "1" > /var/run/redir.pidfi# Custom Functions:# simply tells the redir daemon to start, only tries starting the daemon once# outputs "[fail]" on failure, or "[OK]" on success, no other output or action is takenstart_redir_daemon() { start-stop-daemon --start --quiet --pidfile /var/run/redir.pid --make-pidfile --background --exec $DAEMON -- $DAEMON_OPTS || log_end_msg 1 # "[fail]" log_end_msg 0 # "[OK]"}# tries to stop the daemon up to 5 times (with 1 second pause inbetween) before giving up# outputs "[fail]" and a warning and then exits script on failure, otherwise outputs "[OK]" on successstop_redir_daemon() { COUNTER=0 while ( ps -p $(cat /var/run/redir.pid) | grep -q redir ); do let COUNTER=COUNTER+1 if [ "$COUNTER" -ge "5" ]; then log_end_msg 1 # end the previous message with "[fail]" log_warning_msg "Unable to stop Redir Daemon after 5 retries." exit 1 # exit script fi start-stop-daemon --stop --quiet --oknodo --pidfile /var/run/redir.pid sleep 1 # wait 1 second before checking if process was successfully killed done log_end_msg 0 # end the previous message with "[OK]" on success}# Main Logic:case "$1" in start) if ( ps -p $(cat /var/run/redir.pid) | grep -q redir ); then log_warning_msg "Redir Daemon is already running." else log_begin_msg "Starting Redir Daemon..." start_redir_daemon fi ;; stop) if ( ps -p $(cat /var/run/redir.pid) | grep -q redir ); then log_begin_msg "Stopping Redir Daemon..." stop_redir_daemon else log_warning_msg "Redir Daemon is already stopped." fi ;; restart) log_begin_msg "Stopping Redir Daemon..." stop_redir_daemon log_begin_msg "Starting Redir Daemon..." start_redir_daemon ;; *) log_success_msg "Usage: /etc/init.d/redir {start|stop|restart}" exit 1esacexit 0