| #!/usr/bin/env bash | |
| # Requires: Bash, GNU grep and parallel, htmlq, and httpie or xh. | |
| # Usage: | |
| # ./find-mirrors.sh ARCH DISTRO REPOSITORY PROTOCOL JOBS | |
| # Example: | |
| # ./find-mirrors.sh armhf focal main https 6 | |
| # | |
| # Copyright 2022 Alex DeLorenzo. Licensed under the GPLv3. | |
| # | |
| export ARCH="${1:-${ARCH:-amd64}}" |
(This is a translation of the original article in Japanese by moratorium08.)
(UPDATE (22/3/2019): Added some corrections provided by the original author.)
Writing your own OS to run on a handmade CPU is a pretty ambitious project, but I've managed to get it working pretty well so I'm going to write some notes about how I did it.
| #!/bin/bash | |
| # emulate a 3 nodes network using Linux network namespaces | |
| # n1 -- r0 -- n2 | |
| set -x | |
| # cleanup | |
| ip netns del n1 | |
| ip netns del r0 |
| ### 1: Drop invalid packets ### | |
| /sbin/iptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP | |
| ### 2: Drop TCP packets that are new and are not SYN ### | |
| /sbin/iptables -t mangle -A PREROUTING -p tcp ! --syn -m conntrack --ctstate NEW -j DROP | |
| ### 3: Drop SYN packets with suspicious MSS value ### | |
| /sbin/iptables -t mangle -A PREROUTING -p tcp -m conntrack --ctstate NEW -m tcpmss ! --mss 536:65535 -j DROP | |
| ### 4: Block packets with bogus TCP flags ### |
| # to generate your dhparam.pem file, run in the terminal | |
| openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048 |
| /* | |
| * Get address from symbol (libdwarf version) | |
| * Based on code by : Eli Bendersky (http://eli.thegreenplace.net) | |
| * | |
| */ | |
| #include <stdio.h> | |
| #include <stdarg.h> | |
| #include <stdlib.h> | |
| #include <string.h> |
| # Copyright © 2020 Nicky Peeters | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
| # The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
| # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE |
