Network tools to the rescue

Dec 13, 2015

Benchmark with apache benchmark tool

1	ab -n 99999 -c 1000 http://127.0.0.1:9687/

Port channels & scan

1
2
3

cat > /dev/tcp/localhost/1234
cat < /dev/tcp/localhost/1234 | grep 1234
nc -vzt host port

Trace a process

sudo strace -t -p 13262 -f -e trace=network -s 10000

strace -t -e trace=open,close,read,write df
sudo ltrace -t -p 13262

sudo strace -t $(pidof "nginx" | sed 's/\([0-9]*\)/-p \1/g') -f -e trace=network,open,close,read,write -s 10000

function straceall {
  strace $(pidof "${1}" | sed 's/\([0-9]*\)/-p \1/g')
}

Trace a network log

1	ngrep -qt 'REGEX ' 'port 80'

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Notes of unix snippets

Dec 12, 2015

Read from in a streaming way

1	while read line; do ${CMD}; done

Tokenize a csv

for i in $(cat $1); do
    IFS=',' read -a array <<< "$i";
    echo ${array[0]} ${array[1]} ${array[2]};
done

Redirection

Bidirectional

1 2	exec 4<>(command) command <&4 >&4

Named Pipe

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cd /tmp
mkfifo fifo
exec < fifo

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Evalonlabs

Network tools to the rescue

Benchmark with apache benchmark tool

Port channels & scan

Trace a process

Trace a network log

Notes of unix snippets

Read from in a streaming way

Tokenize a csv

Redirection

Bidirectional

Named Pipe

Evangelos Pappas

[VibrantMedia, Evalonlabs].

London, UK