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Debugging techniques

TCPDUMP

tcpdump -i eth0 -s 1024 -A

Shows only packets from eth0, size of packet is 1024, -A prints ascii.

TCPDUMP and Docker for Mac

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Kubernetes the hard way - notes

Gcloud

Creating a project and linking billing

# Create project
gcloud projects create project-name --set-as-default
# List billing accounts

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Some articles

• Keep your vimrc file clean
• Learn vimscript the hard way
• Vim Tab Madness. Buffers vs Tabs
• Vim: you don't need NERDtree or (maybe) netrw
• vim tips and tricks
• How does the vim “write with sudo” trick work?
• Resizing windows - Learning the vi

Shortcuts

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My Teresa dev environment

Defaults:

• mysql user: teresa
• mysql password: foobar
• mysql database: teresa
• mysql namespace: mysql
• mysql helm name: mysql
• mysql service name: teresa

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# Making substitutions on files where a certain pattern is found
fgrep -r "<something>" . | awk -F : '{print $1}' | xargs sed -i "s/<something>/<something else>/g" $@

## Mac OS specifics

## Cleaning up Time Machine snapshots

tmutil listlocalsnapshots / | awk -F "." '{print $4}' | while read dt; do tmutil deletelocalsnapshots $dt; done

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// to compile: gcc -fno-stack-protector -o boverflow_strcpy boverflow_strcpy.c
// to run (test): ./boverflow_strcpy $(python -c "print 'a'*15")
#include <stdio.h>
#include <strings.h>

void foo(char *bar){
	char buffer[16];
	strcpy(buffer, bar);
	printf("%s", buffer);
}

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// To compile: gcc -fno-stack-protector -o boverflow_gets boverflow_gets.c
// To run (test): python -c "print 'a'*<some number>" | ./boverflow_gets
#include <stdio.h>
#include <string.h>

int main() {
	char buffer[16];
	gets(buffer);
	printf("%s", buffer);
	return 0;

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#include <stdio.h>
#include <string.h>

int main(int argc, char *argv[]) {
	char *test = argv[1];
	int tt = (int)strlen(test);
	printf("%d", tt);
	return 0;
}

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#include <unistd.h>
#include <stdlib.h>
#include <netinet/in.h>

void main() {
	int sock = socket(AF_INET, SOCK_STREAM, 0);
	struct sockaddr_in addr;

	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = INADDR_ANY;

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package main 

import (
	"fmt"
)

type Node struct {
	Data int
	Next_node *Node
}