#!/bin/bash

SSHD=/usr/sbin/sshd
CONF=/etc/ssh/sshd_config
INET=/etc/inetd.conf
SERV=/etc/services

# read settings
[[ -e /boot/config/ident.cfg ]] && . <(fromdos </boot/config/ident.cfg)

# preset default values
[[ -z $USE_TELNET ]] && USE_TELNET=no
[[ -z $PORTTELNET ]] && PORTTELNET=23
[[ -z $USE_SSH ]] && USE_SSH=no
[[ -z $PORTSSH ]] && PORTSSH=22
[[ -z $USE_UPNP ]] && USE_UPNP=no

# determine ssh daemon listening port
CURRENT=$(grep -Pom1 '^#?Port \K\d+$' $CONF)

# enable/disable SSH service
if [[ $USE_SSH == yes ]]; then
  if [[ ! $(pgrep --ns $$ -cf $SSHD) -gt 0 ]]; then
    # start non-running ssh daemon
    /etc/rc.d/rc.sshd start
  else
    # restart when port has changed, rc.sshd will update value in $CONF
    [[ $PORTSSH != $CURRENT ]] && /etc/rc.d/rc.sshd restart
  fi
elif [[ $(pgrep --ns $$ -cf $SSHD) -gt 0 ]]; then
  # stop running ssh daemon
  /etc/rc.d/rc.sshd stop
fi

# enable/disable UPnP function
if [[ $USE_UPNP == yes ]]; then
  [[ ! -x /usr/bin/upnpc ]] && chmod +x /usr/bin/upnpc
else
  [[ -x /usr/bin/upnpc ]] && chmod -x /usr/bin/upnpc
fi

# update TELNET listening port
CURRENT=$(grep -Pom1 '^telnet\s+\K\d+' $SERV)
[[ $PORTTELNET != $CURRENT ]] && sed -ri "s/^(telnet\s+)[0-9]+\/(tcp|udp)\$/\1$PORTTELNET\/\2/" $SERV

# enable/disable TELNET service
if  [[ $USE_TELNET == yes ]]; then
  if [[ -n $(grep -o '^#telnet' $INET) ]]; then
    # restart inet with telnet enabled
    sed -ri "s/^#(telnet\s.+telnetd\$)/\1/" $INET
   /etc/rc.d/rc.inetd restart
  elif [[ $PORTTELNET != $CURRENT ]]; then
    # restart when port has changed
    /etc/rc.d/rc.inetd restart
  fi
elif [[ -n $(grep -o '^telnet' $INET) ]]; then
  # restart inet with telnet disabled
  sed -ri 's/^(telnet\s.+telnetd$)/#\1/' $INET
  /etc/rc.d/rc.inetd restart
fi