Chris Vasiladiotis compor

## c_linux_tcpd_api_example.c
/*
simple usage of the tcpd/tcp wrapper API

a full-fledged program would probalby call hosts_access() upon accepting a new
connection and if denied it would close()
the established connection with FIN,ACK or most preferably RST

build with :

gcc -c tcpd_test.c

## bash_tcpdump_capture_synack_packets.sh
# capture SYN/ACK flagged packets
# tcp[13] is the byte location of TCP flags (URG,ACK,PSH,RST,SYN,FIN)
#
# mnemonic
#
# Unskilled 32
# Attackers 16
# Pester     8
# Real       4
# Security   2

## LineBreakButton.cpp
// header

#include <qobject.h>
#include <qwidget.h>
#include <qpushbutton.h>

class LineBreakButton : public QPushButton {
    Q_OBJECT

    public:

## bash_sort_filezila_log.sh
#!/bin/bash

#
# entry example
#
# (1579051) 10/16/2009 0:02:13 AM - (not logged in) (192.168.1.11)> USER chris
#
# sort -k1n fzs-2009-10-16.log
# does not work properly because when the session id and timestamp are the same
# it goes on and tries to sort based on the message

## bash_iperf_mcast_source_sink.sh
# multicast group 239.1.1.1 on port 4321

# multicast listener/sink with read buffer of 512 bytes

iperf -s -u -B 239.1.1.1 -i 1 -l 512 -p 4321


# multicast transmitter/source with write buffer of 512 bytes
# fill up bandwidth of 80Kb/s

## bash_check_ipv4_validity.sh
# the argument must in a dot decimal ipv4 format

function is_valid_ipv4() {
  if [ -z "$1" ]; then
    return 0;
  fi

  IFS="."
  local isvalid=1
  local bytectr=0

## bash_openssl_pkcs12_envelope.sh
# mycert.crt - certificate file
# mykey.key - private key file

openssl pkcs12 -export -in mycert.crt -inkey mykey.key -out env.p12 -password stdin

## bash_calc_elapsed_time_log_record.sh
#!/bin/bash

#
# parses the time (in seconds) that elapsed between 2 consecutive entries
# each matching to pattern1 and pattern2.
# date format : [DDD] [MMM] [dd] [hh]:[mm]:[ss] [YYYY]
# example     : Tue May 12 06:49:44 2009
#
# substitute the patterns at will
#

## bash_patch_between_files.sh
# produces a patch between the files in the 2 dirs

# -c : special context for output
# -r : directory recursively
# -B : ignore blanks

diff -crB before_dir after_dir > foo.patch

# if you want to patch before_dir now

## bash_iptables_ping_limit_rate.sh
iptables -A INPUT -p icmp -m limit --limit 39.6/m --limit-burst 1 -j DROP


# it will cause 2 out of 3 icmp replies to fail when executing a ping like
# ping -c 3 -i 1 -w 3 10.10.10.10
#
# we needed 1 out of 3 successful ping replies in, so that's 2/3 ~= 0.67 replies per second
# since we cannot use less than 0 values, we up the scale to the minute, so
# 0.67 * 60 = 39.6 replies in 1 minute :-)
	/*
	simple usage of the tcpd/tcp wrapper API

	a full-fledged program would probalby call hosts_access() upon accepting a new
	connection and if denied it would close()
	the established connection with FIN,ACK or most preferably RST

	build with :

	gcc -c tcpd_test.c
	# capture SYN/ACK flagged packets
	# tcp[13] is the byte location of TCP flags (URG,ACK,PSH,RST,SYN,FIN)
	#
	# mnemonic
	#
	# Unskilled 32
	# Attackers 16
	# Pester 8
	# Real 4
	# Security 2
	// header

	#include <qobject.h>
	#include <qwidget.h>
	#include <qpushbutton.h>

	class LineBreakButton : public QPushButton {
	Q_OBJECT

	public:
	#!/bin/bash

	#
	# entry example
	#
	# (1579051) 10/16/2009 0:02:13 AM - (not logged in) (192.168.1.11)> USER chris
	#
	# sort -k1n fzs-2009-10-16.log
	# does not work properly because when the session id and timestamp are the same
	# it goes on and tries to sort based on the message
	# multicast group 239.1.1.1 on port 4321

	# multicast listener/sink with read buffer of 512 bytes

	iperf -s -u -B 239.1.1.1 -i 1 -l 512 -p 4321


	# multicast transmitter/source with write buffer of 512 bytes
	# fill up bandwidth of 80Kb/s
	# the argument must in a dot decimal ipv4 format

	function is_valid_ipv4() {
	if [ -z "$1" ]; then
	return 0;
	fi

	IFS="."
	local isvalid=1
	local bytectr=0
	# mycert.crt - certificate file
	# mykey.key - private key file

	openssl pkcs12 -export -in mycert.crt -inkey mykey.key -out env.p12 -password stdin
	#!/bin/bash

	#
	# parses the time (in seconds) that elapsed between 2 consecutive entries
	# each matching to pattern1 and pattern2.
	# date format : [DDD] [MMM] [dd] [hh]:[mm]:[ss] [YYYY]
	# example : Tue May 12 06:49:44 2009
	#
	# substitute the patterns at will
	#
	# produces a patch between the files in the 2 dirs

	# -c : special context for output
	# -r : directory recursively
	# -B : ignore blanks

	diff -crB before_dir after_dir > foo.patch

	# if you want to patch before_dir now
	iptables -A INPUT -p icmp -m limit --limit 39.6/m --limit-burst 1 -j DROP


	# it will cause 2 out of 3 icmp replies to fail when executing a ping like
	# ping -c 3 -i 1 -w 3 10.10.10.10
	#
	# we needed 1 out of 3 successful ping replies in, so that's 2/3 ~= 0.67 replies per second
	# since we cannot use less than 0 values, we up the scale to the minute, so
	# 0.67 * 60 = 39.6 replies in 1 minute :-)