nyrahul

#!/bin/bash

trap byefunc EXIT

byefunc()
{
    [[ "$NO_CPUINFO" == "1" ]] && return
    lscpu
}

nyrahul

parse_git_branch() {
         git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'
}
netns_name() {
    str=`ip netns identify $$`
    [[ "$str" != "" ]] && echo "\033[1;35m[$str]\033[0m " && return
}
export PS1="$(netns_name)\u@\h:\[\033[32m\]\w\[\033[33m\]\$(parse_git_branch)\[\033[00m\]\$ "

nyrahul

#!/bin/bash 
 
[[ "`whoami`" != "root"  ]] && echo "Got to be root. Use sudo." && exit
export LOG_LEVEL=DBG
export OVERRIDE_IP=192.168.100.100

./server_proxy &
sleep 1
 
sysctl -w net.ipv4.ip_forward=1 

nyrahul

ssh -L 4000:192.168.56.102:80 127.0.0.1

# 4000 = Remote port
# 192.168.50.102 = Remote IP
# 80 = Local port
# 127.0.0.1 = Local IP

What this means?
Whatever packets come to 127.0.0.1:80 forward it to 192.168.56.102:4000

nyrahul

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/time.h>

/*---------------------------------------------------------------------------*/
/* CITT CRC16 polynomial ^16 + ^12 + ^5 + 1 */
/*---------------------------------------------------------------------------*/
unsigned short crc16_add(unsigned char b, unsigned short acc)
{

nyrahul

#!/bin/bash

OUTFILE=perf_out.txt
rm perf*.txt
for((i=0;i<4;i++)); do
    #timeout -s SIGINT 12 perf stat -e dTLB-loads -e cs,cycles,instructions -D 2000 -a -o perf$i.txt
    #timeout -s SIGINT 12 perf stat -e dTLB-stores -e cs,cycles,instructions -D 2000 -a -o perf$i.txt
    #timeout -s SIGINT 12 perf stat -e dTLB-load-misses,dTLB-store-misses -e cs,cycles,instructions -D 2000 -a -o perf$i.txt

    timeout -s SIGINT 12 perf stat -e cs,cycles,instructions -D 2000 -a -o perf$i.txt

nyrahul

#!/bin/bash

#socat examples:
#recv msgs on udp port 60K and print to stdout. recv input on stdin and sendto connected socket.
socat - UDP4-LISTEN:60000
socat - UDP4-SENDTO:192.168.106.2:60000

# send contents of t.c to multiple TCP4 servers
socat GOPEN:t.c - | tee >(socat - tcp4:127.0.0.1:12345) >(socat - tcp4:127.0.0.1:33455) > /dev/null

nyrahul

usage()
{
  echo "Usage: $0 <options>"
}

parse_cmdargs()
{
    # -s | --server is the short and long option to be parsed
    # Remember to specify : in cases where argument is nessary both in short and long options
    OPTS=`getopt -o s: --long server:xyz: -n 'parse-options' -- "$@"`

nyrahul

#!/bin/bash

set -E
trap 'echo Failed line: $LINENO command: $BASH_COMMAND && exit $?' ERR

lcnt=1
nw_pref="192.168.10"
create_node()
{
    ns="$1"; shift;

nyrahul

#!/bin/bash

set -E
trap 'echo Failed at $lineno COMMAND: $BASH_COMMAND && exit 1' ERR

SRV_IP="192.168.106.2"
SP_IP="192.168.105.2"

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -F