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piratebox.common

#############################################################################
# PirateBox global config. /etc/init.d/piratebox setup to take effect

pb_ip="192.168.1.1"
pb_wireless_ssid="PirateBox - Share Freely"
pb_hostname="piratebox"
pb_usbdevice="/dev/sda1"
pb_usbmount="/mnt/usb"
pb_usbdir="$pb_usbmount/PirateBox"
pb_share="$pb_usbdir/Shared"
pb_extimg="$pb_usbdir/OpenWRT.img"
pb_extmount="/mnt/ext"
pb_swapimg="$pb_usbdir/OpenWRT.swap"


#############################################################################
# PirateBox helper functions

pb_nodns() {
  # disable local DNS per dnsmasq
  cp /tmp/resolv.conf.auto /tmp/resolv.conf
}

pb_usbwait() {
  # wait for USB device to show up
  if [ ! -e "$pb_usbdevice" ]
  then
    echo "Please connect USB disk. If it is already plugged-in,"
    echo "wait for a few seconds, and if nothing happens, please"
    echo "reconnect the device. Keep in mind that your router's"
    echo "ports may not be able to supply enough power to"
    echo "spin-up a USB HDD."
    while [ ! -e "$pb_usbdevice" ]
    do
      sleep 1
      echo -n "."
    done
    echo
    echo "USB disk is now available. Continuing..."
  fi
}

pb_ismounted() {
  mount | grep "on $1 " >/dev/null
}

pb_mount() {
  parts=$*
  [ "$parts" == "-a" ] && parts="usb ext swap"
  for part in $*
  do
    case $part in
      usb)
	  pb_ismounted "$pb_usbmount" && continue
	  [ -d "$pb_usbmount" ] || mkdir -p "$pb_usbmount"
          if ! mount "$pb_usbdevice" "$pb_usbmount"
          then
            echo "${initscript}: ERROR: unable to mount USB storage" >&2
            exit 5
          fi
          ;;
      ext)
	  pb_ismounted "$pb_extmount" && continue
	  pb_mount usb
	  [ -d "$pb_extmount" ] || mkdir -p "$pb_extmount"
          if ! mount -o loop,rw,sync "$pb_extimg" "$pb_extmount"
          then
            echo "${initscript}: ERROR: unable to mount ext image" >&2
            exit 5
          fi
          ;;
      swap)
	  pb_mount usb
          swapon "$pb_swapimg" &>/dev/null
          ;;
    esac
  done
}

pb_umount() {
  parts=$*
  [ "$parts" == "-a" ] && parts="swap ext usb"
  for part in $*
  do
    case $part in
      usb)
	  pb_ismounted "$pb_usbmount" || continue
          pb_umount swap ext
          if ! umount "$pb_usbmount"
          then
            echo "${initscript}: WARNING: unable to umount USB storage" >&2
          fi
          ;;
      ext)
          # losetup -d here just in case user umounted manually
          losetup -d /dev/loop0 &>/dev/null
	  pb_ismounted "$pb_extmount" || continue
          if ! umount "$pb_extmount"
          then
            # PirateBox might still be running, so...
            # silently try to stop PirateBox service
            pb_stop &>/dev/null
            sleep 2
            if ! umount "$pb_extmount"
            then
              echo "${initscript}: WARNING: unable to umount ext image" >&2
            fi
          fi
          losetup -d /dev/loop0
          ;;
      swap)
          #TODO: error handling
          swapoff "$pb_swapimg" &>/dev/null
          ;;
    esac
  done
}

pb_uciadd() {
  local config=$1 ; shift
  local section=$1 ; shift
  local type=$1 ; shift
  [ -e "/etc/config/$config" ] || touch "/etc/config/$config"
  uci show "$config.$section" &>/dev/null \
    || uci add "$config $section" &>/dev/null
  uci set "$config.$section=$type"
}

pb_uciset() {
  local config=$1 ; shift
  local section=$1 ; shift
  local type=$1 ; shift
  pb_uciadd $config $section $type
  for opt in "$@"
  do
    uci set "$config.$section.$opt"
  done
  uci commit
}

pb_netconfig() {
  # reconfigure network
  uci set "system.@system[0].hostname=$pb_hostname"
  echo "127.0.0.1 $pb_hostname localhost." >/etc/hosts
  echo "$pb_ip $pb_hostname" >>/etc/hosts
  uci set "network.lan.ipaddr=$pb_ip"
  #CAVE: wireless config might be platform specific
  uci set "wireless.radio0.disabled=0"
  uci set "wireless.@wifi-iface[0].ssid=$pb_wireless_ssid"

  # redirect all 80/tcp traffic to the PirateBox
  pb_uciset firewall piratebox redirect \
    src=lan \
    proto=tcp \
    src_dport=80 \
    dest_ip=$pb_ip \
    dest_port=80

  # redirect all DNS requests to PirateBox IP
  pb_uciset dhcp piratebox domain \
    name='#' \
    ip=$pb_ip

  # CAVE: ugly hack, patching a preinstalled file
  # patch dnsmasq start script to properly handle domain wildcards
  sed -i 's#^.*\${fqdn\%\.\*}\" ==.*$## ; s#^.*fqdn=\"\$fqdn.*$##' \
    /etc/init.d/dnsmasq

}

pb_usbconfig() {
  # prepare USB disk for mounting
  [ -d "$pb_usbmount" ] || mkdir -p "$pb_usbmount"
  pb_uciset fstab piratebox mount \
    target=$pb_usbmount \
    device=$pb_usbdevice \
    fstype=vfat \
    options=rw,sync \
    enabled_fsck=0 \
    enabled=1

}

pb_undoconfig() {
  # undo config changes
  uci delete dhcp.piratebox
  uci delete firewall.piratebox
  uci delete fstab.piratebox
  uci delete fstab.pirateswap
  uci set "system.@system[0].hostname=OpenWRT"
  uci set "network.lan.ipaddr=192.168.1.1"
  uci commit
  cp /rom/etc/opkg.conf /etc/
  cp /rom/etc/hosts /etc/
  cp /rom/etc/init.d/dnsmasq /etc/init.d/
  rm /usr/local
  [ -d "$pb_usbmount" ] && rmdir "$pb_usbmount"
  [ -d "$pb_extmount" ] && rmdir "$pb_extmount"
}

pb_needswap() {
  [ ! -e "$pb_swapimg" ]
}

pb_mkswap() {
  pb_umount swap
  pb_mount usb
  [ -d "$(dirname $pb_swapimg)" ] || mkdir -p "$(dirname $pb_swapimg)"
  # create a swap file
  dd if=/dev/zero of="$pb_swapimg" bs=1M count=32
  mkswap "$pb_swapimg"
  pb_uciset fstab swap pirateswap \
    device=$pb_swapimg \
    enabled=1
}

pb_needextimg() {
  # [ ! -e "$pb_extimg" ]
  # always re-create ext image because of opkg woes
  true
}

pb_mkextimg() {
  pb_umount ext
  pb_mount usb
  [ -d "$(dirname $pb_extimg)" ] || mkdir -p "$(dirname $pb_extimg)"
  # use a preformatted image to get rid of e2fsprogs dependency
  #dd if=/dev/zero of="$pb_extimg" bs=1M count=16
  #echo y | mkfs.ext3 "$pb_extimg"
  gzip -dc /usr/share/piratebox/OpenWRT.img.gz >"$pb_extimg"
  [ -d "$pb_extmount" ] || mkdir -p "$pb_extmount"
  pb_uciset fstab piratebox mount \
    target=$pb_extmount \
    device=$pb_extimg \
    options=loop \
    enabled=1
}

pb_init() {
  echo "${initscript}: Mounting external USB storage..."

  pb_mount usb
  [ -d "$pb_usbdir" ] || mkdir -p "$pb_usbdir"

  if pb_needswap
  then
    echo "${initscript}: Creating swapspace..."
    pb_mkswap
  fi

  if pb_needextimg
  then
    echo "${initscript}: Creating ext loop image..."
    pb_mkextimg
  fi

  pb_mount ext

  # prepare opkg for /usr/local
  grep "^dest piratebox" /etc/opkg.conf \
    || echo "dest piratebox $pb_extmount" >>/etc/opkg.conf

  # link ext usr to /usr/local
  ln -sf "$pb_extmount/usr" /usr/local

  # fix for ext packages not installing to usr
  [ -d "$pb_extmount/usr/lib" ] || mkdir -p "$pb_extmount/usr/lib"
  ln -sf "$pb_extmount/usr/lib" "$pb_extmount/lib"
}

pb_update() {
  pb_mount ext

  # disable local DNS redirection
  pb_nodns

  # CAVE: ugly hack
  # in case we were called from the postinst, remove opkg lock
  [ -e /var/lock/opkg.lock ] && \
    mv /var/lock/opkg.lock /var/lock/opkg.lock_

  # install python to piratebox storage
  if ! opkg update
  then
    echo "${initscript}: ERROR: No Internet connection on WAN port" >&2
    exit 5
  fi
  opkg -d piratebox install python

  # CAVE: ugly hack
  # in case we were called from the postinst, restore opkg lock
  [ -e /var/lock/opkg.lock_ ] && \
    mv /var/lock/opkg.lock_ /var/lock/opkg.lock

  # get PirateBox files
  [ -d "$pb_share" ] || mkdir -p "$pb_share"
  mkdir -p "$pb_share"
  cd "$pb_share"
  wget http://daviddarts.com/piratebox/piratebox-logo.png -O piratebox-logo.png
  wget http://daviddarts.com/piratebox/.READ.ME.htm -O .READ.ME.htm
  wget http://daviddarts.com/piratebox/.BACK.TO.MENU.htm -O .BACK.TO.MENU.htm
  # adjust hostname
  sed -i "s#http://piratebox#http://$pb_hostname#g" .READ.ME.htm
  sed -i "s#http://piratebox#http://$pb_hostname#g" .BACK.TO.MENU.htm

  # install PirateBox droopy port
  [ -d /usr/local/bin ] || mkdir -p /usr/local/bin
  cd /usr/local/bin
  wget http://daviddarts.com/piratebox/droopy -O droopy
  chmod +x droopy
}

pb_start() {
  pb_mount usb ext swap

# PirateBox Welcome HTML
local html=$(cat <<EOF
<p><br>
  <b>1.</b> Learn more about the project
    <a href="http://$pb_hostname:8001/.READ.ME.htm"><b>here</b></a>.
</p>
<p>
  <b>2.</b> Click above to begin sharing.
</p>
<p>
  <b>3.</b> Browse and download files
  <a href="http://$pb_hostname:8001"><b>here</b></a>.
</p>
<p>Use <b>#PirateBoxBru</b> to tell about me...<p>
EOF
)

  export PATH=$PATH:/usr/local/bin
  export LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/lib
  cd "$pb_share"
  start-stop-daemon -S -x python \
    -p /var/run/${NAME}.droopy.pid \
    -m -b -- \
    /usr/local/bin/droopy \
    -p "$pb_share/piratebox-logo.png" \
    -d "$pb_share" -m "$html"
  start-stop-daemon -S -x python \
    -p /var/run/${NAME}.simple.pid \
    -c nobody:nogroup -m -b -- \
    -m SimpleHTTPServer 8001
}

pb_stop() {
  # killing all piratebox processes
  local pidfile
  for pidfile in $(ls /var/run/${NAME}.*.pid 2>/dev/null)
  do
    start-stop-daemon -K -s HUP -p "${pidfile}"
    rm -f "${pidfile}"
  done
  [ -z "${pidfile}" ] && echo "${initscript}: not running"
  sleep 3
  pb_umount usb
}

Documentation : http://blog.cybermonde.org/post/2012/03/26/PirateBox