Derrick Lyndon Pallas pallas

BS/CS+CE (math minor) @ucdavis, MS/CS @ucdavis, DTM, FCC:KK6WMI/AE; now retired; past @meterup, SES, @ArgosyLabs, @cisco @meraki, @riverbed, @amzn

pallas / mac_to_ipv6network.py

Created August 9, 2019 23:12

Inject MAC address into IPv6 Network

	# SPDX-License-Identifier: Unlicense
	from ipaddress import IPv6Network
	from binascii import unhexlify

	network = IPv6Network("2001:DB8::/32")
	mac = "12:34:56:78:9a:bc"
	mac_bytes = b''.join(map(unhexlify, mac.split(':')))
	address = network[int.from_bytes(mac_bytes, byteorder='big')]

	print(network, mac, mac_bytes, address)

pallas / dblock-update.sh

Last active February 26, 2019 08:53

	#!/bin/bash
	# Author: Derrick Pallas
	# License: zlib
	BASE='dblock-set'
	TEMP=${BASE}$$

	ipset create -exist "$BASE" hash:ip --netmask 24 \|\| exit 1
	iptables -nL INPUT \| grep -q "$BASE" \|\|
	(
	( iptables -N "$BASE" \|\| iptables -F "$BASE" ) &&

pallas / abuse-ch-update.sh

Last active February 26, 2019 09:38

	#!/bin/bash
	# Author: Derrick Pallas
	# License: zlib
	BASE='feodo-set'
	TEMP=${BASE}$$

	ipset create -exist "$BASE" hash:ip --netmask 32 \|\| exit 1
	iptables -nL INPUT \| grep -q "$BASE" \|\|
	(
	( iptables -N "$BASE" \|\| iptables -F "$BASE" ) &&

pallas / gdb-bt.sh

Last active July 15, 2020 20:40

GDB wrapper to produce backtrace automatically

	#!/bin/bash
	# SPDX-License-Identifier: Unlicense
	# Author: Derrick Lyndon Pallas <[email protected]>
	[ $# -gt 0 ] &&
	exec gdb "$1" --return-child-result --silent --batch \
	--ex "run $([ $# -gt 1 ] && printf '%q ' "${@:2}")" \
	--ex bt \
	2>/dev/null
	#

pallas / courier-pem.mk

Created January 14, 2017 21:40

Will regenerate courier.pem & restart mail daemons when Let's Encrypt certificate renews.

	BASE?=/etc/letsencrypt
	DOMAIN?=mx.example.com

	DHBITS:=4096

	LIVE:=$(BASE)/live/$(DOMAIN)
	PRIVKEY:=$(LIVE)/privkey.pem
	FULLCHAIN:=$(LIVE)/fullchain.pem

	.PHONY: default

pallas / try.hh

Created November 21, 2016 00:52

C++ macros for trying libc calls, throwing std::runtime_error on errno

pallas / magic_mask.h

Created July 19, 2015 20:54

C++ template to generate a magic mask with alternating runs of 0s & 1s

	#include <cstdint>

	template <typename T>
	inline T magic_mask(int_fast8_t n) {
	T base = T(1)<<(int_fast16_t(1)<<n);
	return (~T(0))/(basebase-1)(base-1);
	}

pallas / keybase.md

Last active May 7, 2020 19:30

Keybase proof

I hereby claim:

To claim this, I am signing this object:

pallas / intrusive_tree.hh

Last active October 29, 2022 18:26

C++ intrusive red-black tree

pallas / intrusive_order.hh

Last active August 29, 2015 13:58

C++ intrusive ordered queue + fast tail inserts