Saturday, January 07, 2017

Monday, January 02, 2017

Perl script to convert to x Based String

#/usr/bin/perl -W

use strict;
use warnings;

use constant DIV => 24;

my $v = shift or die "Usage: $0 ";

my $d = 0;
my $str = '';

do {
    my $c = chr(ord('A') + ($v % DIV));
    $str = $c . $str;
    $v = int($v / DIV)
} while ($v > 0);

print $str;

0;

Saturday, December 19, 2015

Easy way to prevent from GFW DNS abusing

The easiest way to distinguish the GFW DNS abusing result from real DNS responses is using iptables to block the dummy DNS response by GFW

# iptables -t mangle -I PREROUTING -s 8.8.8.8/16 -m ttl --ttl-gt 63 -j DROP
# ip6tables -t mangle -I PREROUTING -s 2001:4860:4860::8844/112 -m hl --hl-gt 52 -j DROP

Wednesday, September 04, 2013

Saturday, January 26, 2013

PHP5 FastCGI init.d scriipt for Debian/Ubuntu

Recently, I am using Nginx + PHP5 FastCGI as the new web platform. I really need a init.d script for PHP5 FastCGI. It is not so difficult according to the skeleton.

First of all, make sure to install php5-cgi and spawn-fcgi.
sudo apt-get install php5-cgi spawn-fcgi
Second, create the /etc/init.d/php-fastcgi script, as below:

#! /bin/sh
### BEGIN INIT INFO
# Provides:          php-fastcgi
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: PHP5 FastCGI mode
# Description:       This file should be used to construct scripts to be
#                    placed in /etc/init.d.
### END INIT INFO

# Author: Yi Zhao

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="PHP5 FastCGI Service"
NAME=php5-cgi
FASTCGI_USER=www-data
FASTCGI_GROUP=www-data
SOCKET=/var/run/php-fastcgi.sock
PHP5=/usr/bin/php5-cgi
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME
CHILDREN=2
DAEMON=/usr/bin/spawn-fcgi
DAEMON_ARGS="-s $SOCKET -C $CHILDREN -P $PIDFILE -u $FASTCGI_USER -g $FASTCGI_GROUP -f $PHP5"

# Exit if the package is not installed
[ -x "$DAEMON" -a -x "$PHP5" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
#. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
        # Return
        #   0 if daemon has been started
        #   1 if daemon was already running
        #   2 if daemon could not be started
        start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
                || return 1
        start-stop-daemon --start --quiet --pidfile $PIDFILE --exec $DAEMON -- \
                $DAEMON_ARGS \
                || return 2
        # Add code here, if necessary, that waits for the process to be ready
        # to handle requests from services started subsequently which depend
        # on this one.  As a last resort, sleep for some time.
}

#
# Function that stops the daemon/service
#
do_stop()
{
        # Return
        #   0 if daemon has been stopped
        #   1 if daemon was already stopped
        #   2 if daemon could not be stopped
        #   other if a failure occurred
        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2
        # Wait for children to finish too if this is a daemon that forks
        # and if the daemon is only ever run from this initscript.
        # If the above conditions are not satisfied then add some other code
        # that waits for the process to drop all resources that could be
        # needed by services started subsequently.  A last resort is to
        # sleep for some time.
        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --name $NAME
        [ "$?" = 2 ] && return 2
        # Many daemons don't delete their pidfiles when they exit.
        rm -f $PIDFILE
        return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
        #
        # If the daemon can reload its configuration without
        # restarting (for example, when it is sent a SIGHUP),
        # then implement that here.
        #
        start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
        return 0
}

case "$1" in
  start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  status)
       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  #reload|force-reload)
        #
        # If do_reload() is not implemented then leave this commented out
        # and leave 'force-reload' as an alias for 'restart'.
        #
        #log_daemon_msg "Reloading $DESC" "$NAME"
        #do_reload
        #log_end_msg $?
        #;;
  restart|force-reload)
        #
        # If the "reload" option is implemented then remove the
        # 'force-reload' alias
        #
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
          0|1)
                do_start
                case "$?" in
                        0) log_end_msg 0 ;;
                        1) log_end_msg 1 ;; # Old process is still running
                        *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
          *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
  *)
        #echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
        echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
        exit 3
        ;;
esac

:
Add php-fastcgi into the start list
sudo update-rc.d php-fastcgi default
this will start for init level 2,3,4,5