git clone https://github.com/hugozhu/mini_raspbian_boot

dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait cgroup_enable=memory

sudo dd bs=1m if=2015-01-31-raspbian.img of=/dev/disk4 #/dev/disk4

/dev/sda1            8192      122879       57344    c  W95 FAT32 (LBA)
/dev/sda2          122880     6399999     3138560   83  Linux

now = os.time()

chat = "树莓派通知" -- telegram的会话名称

safe_commands = {}
safe_commands["uptime"]  = "uptime"
safe_commands["w"]       = "w"
safe_commands["ps"]      = "ps ax"
safe_commands["netstat"] = "netstat -na"
safe_commands["df"]      = "df"
safe_commands["ss"]      = "ss"
safe_commands["free"]    = "free"

function on_msg_receive (msg)
	if msg.out then
	    return
	end
	if msg.text then
		-- mark_read(msg.from.print_name)	
		-- vardump(msg)
		cmd = string.lower(trim(msg.text))
		if cmd == "ping" then
			send_msg (chat, 'pong', ok_cb, false)
		elseif safe_commands[cmd] ~= nil then
			send_msg (chat, exec(safe_commands[cmd]), ok_cb, false)
		end
	end
end

function on_our_id (id)
end
 
function on_secret_chat_created (peer)
end
 
function on_user_update (user)
end
 
function on_chat_update (user)
end
 
function on_get_difference_end ()
end
 
function on_binlog_replay_end ()
end

function exec(cmd)
   local output = ""
   f = assert (io.popen (cmd))
   for line in f:lines() do
     output = output .. "\n" .. line
   end -- for loop
   f:close()
   return output
end	

function trim(s)
  return (s:gsub("^%s*(.-)%s*$", "%1"))
end

function vardump(value, depth, key)
  local linePrefix = ""
  local spaces = ""
  
  if key ~= nil then
    linePrefix = "["..key.."] = "
  end
  
  if depth == nil then
    depth = 0
  else
    depth = depth + 1
    for i=1, depth do spaces = spaces .. "  " end
  end
  
  if type(value) == 'table' then
    mTable = getmetatable(value)
    if mTable == nil then
      print(spaces ..linePrefix.."(table) ")
    else
      print(spaces .."(metatable) ")
        value = mTable
    end		
    for tableKey, tableValue in pairs(value) do
      vardump(tableValue, depth, tableKey)
    end
  elseif type(value)	== 'function' or 
      type(value)	== 'thread' or 
      type(value)	== 'userdata' or
      value		== nil
  then
    print(spaces..tostring(value))
  else
    print(spaces..linePrefix.."("..type(value)..") "..tostring(value))
  end
end

print(exec("uptime"))

wget http://snapshot.raspbian.org/201403301125/raspbian/pool/main/o/openswan/openswan_2.6.37-3_armhf.deb
sudo dpkg -i openswan_2.6.37-3_armhf.deb

sudo iptables -F
sudo iptables -X
sudo iptables -t nat -F
sudo iptables -t nat -X
sudo iptables -t nat -A PREROUTING -s 192.168.3.0/24 -p tcp --dport 80 -j REDIRECT --to-ports 12345 #转发VPN客户端的HTTP流量到端口12345
sudo iptables -t nat -A PREROUTING -s 192.168.3.0/24 -p tcp --dport 443 -j REDIRECT --to-ports 12345 #转发VPN客户端的HTTPS流量到端口12345
sudo iptables -t nat -A POSTROUTING -s 192.168.3.0/24 -o eth0 -j MASQUERADE #转发VPN客户端的TCP流量到网络出口，并进行IP伪装；如果树莓派使用无线网卡则将eth0改成wlan0

package main

import (
	. "github.com/hugozhu/rpi"
	"github.com/hugozhu/rpi/pcd8544"
	"log"
	"os/exec"
	"time"
)

const (
	DIN        = PIN_MOSI
	SCLK       = PIN_SCLK
	DC         = PIN_GPIO_2
	RST        = PIN_GPIO_0
	CS         = PIN_CE0
	PUSHBUTTON = PIN_GPIO_6
	CONTRAST   = 40 //may need tweak for each Nokia 5110 screen
)

var screen_chan chan int
var TOTAL_MODES = 3

func init() {
	WiringPiSetup()
	pcd8544.LCDInit(SCLK, DIN, DC, CS, RST, CONTRAST)
	screen_chan = make(chan int, 1)
}

func main() {
	//a goroutine to check button push event
	go func() {
		last_time := time.Now().UnixNano() / 1000000
		btn_pushed := 0
		for pin := range WiringPiISR(PUSHBUTTON, INT_EDGE_FALLING) {
			if pin > -1 {
				n := time.Now().UnixNano() / 1000000
				delta := n - last_time
				if delta > 300 { //software debouncing
					log.Println("btn pushed")
					last_time = n
					btn_pushed++
					screen_chan <- btn_pushed % TOTAL_MODES //switch the screen display
				}
			}
		}
	}()

	//a groutine to update display every 5 seconds
	go loop_update_display()

	//set screen 0 to be default display
	screen_chan <- 0

	ticker := time.NewTicker(5 * time.Second)

	for {
		<-ticker.C
		screen_chan <- -1 //refresh current screen every 5 seconds
	}
}

func loop_update_display() {
	current_screen := 0
	for screen := range screen_chan {
		if screen >= 0 {
			if screen != current_screen {
				//btn pushed
				current_screen = screen
				display_loading()
			}
		}
		switch current_screen {
		case 0:
			display_screen0()
		case 1:
			display_screen1()
		case 2:
			display_screen2()
		}
	}
}

func display_loading() {
	pcd8544.LCDclear()
	pcd8544.LCDdrawstring(0, 20, "Loading ...")
	pcd8544.LCDdisplay()
}

func display_screen0() {
	out, err := exec.Command("/bin/screen_0.sh").CombinedOutput()
	if err != nil {
		out = []byte(err.Error())
	}

	pcd8544.LCDclear()
	pcd8544.LCDdrawstring(0, 0, string(out))
	pcd8544.LCDdisplay()
}

func display_screen1() {
	out, err := exec.Command("/bin/screen_1.sh").CombinedOutput()
	if err != nil {
		out = []byte(err.Error())
	}

	pcd8544.LCDclear()
	pcd8544.LCDdrawstring(0, 0, string(out))
	pcd8544.LCDdisplay()
}

func display_screen2() {
	out, err := exec.Command("/bin/screen_2.sh").CombinedOutput()
	if err != nil {
		out = []byte(err.Error())
	}

	pcd8544.LCDclear()
	pcd8544.LCDdrawstring(0, 0, string(out))
	pcd8544.LCDdisplay()
}

mod_rpi on

####add it to tsar default output
output_stdio_mod mod_rpi

hugo@raspberrypi2 ~/projects/tsardevel $ tsardevel rpi 
build:make
install:make install
uninstall:make uninstall
hugo@raspberrypi2 ~/projects/tsardevel $ ls rpi
Makefile  mod_rpi.c  mod_rpi.conf

/*
 * (C) 2010-2011 Alibaba Group Holding Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#include "tsar.h"

/*
 * Structure for rpi infomation.
 */
struct stats_rpi {
	unsigned int cpu_temp;
};

#define STATS_TEST_SIZE (sizeof(struct stats_rpi))

static char *rpi_usage = "    --rpi               Rapsberry Pi information (CPU temprature ...)";


static void read_rpi_stats(struct module *mod, char *parameter)
{
	FILE *fp;
	char buf[64];
	memset(buf, 0, sizeof(buf));
	struct stats_rpi st_rpi;
	memset(&st_rpi, 0, sizeof(struct stats_rpi));

	if ((fp = fopen("/sys/class/thermal/thermal_zone0/temp", "r")) == NULL) {
		return;
	}

	int cpu_temp;

	fscanf(fp, "%d", &cpu_temp);

	st_rpi.cpu_temp = cpu_temp;

	int pos = sprintf(buf, "%u",
			/* the store order is not same as read procedure */
			st_rpi.cpu_temp);
	buf[pos] = '\0';
	set_mod_record(mod, buf);
	fclose(fp);
	return;
}

static struct mod_info rpi_info[] = {
	{"  temp", SUMMARY_BIT,  0,  STATS_NULL}
};

static void set_rpi_record(struct module *mod, double st_array[],
		U_64 pre_array[], U_64 cur_array[], int inter)
{
	st_array[0] = cur_array[0]/1000.0;
}

void mod_register(struct module *mod)
{	
	register_mod_fileds(mod, "--rpi", rpi_usage, rpi_info, 1, read_rpi_stats, set_rpi_record);
}