====== Openbsd ======
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. As an example of the effect OpenBSD has, the popular OpenSSH software comes from OpenBSD. 

===== Links =====
[[https://ftp.spline.de/pub/OpenBSD/|Berlin Mirror]]\\

===== FAQ =====
[[https://www.openbsd.org/faq/index.html|Global FAQ]]\\
[[https://www.openbsd.org/faq/pf/index.html|PF FAQ]]\\
[[https://www.openbsdhandbook.com/|OpenBSD Handbook]]\\
==== cheats ====

List USB devices
<code>
usbdevs -v
</code>

LogFW

<code>
tcpdump -s 160 -n -e -ttt -i pflog0 action block
</code>

Sysmerge

<code>
-d (behaelt deine aenderungen)
-i (loescht deine aenderungen)
</code>

List Memory

<code>
sysctl hw | grep mem
</code>

List Hardware

<code>
sysctl hw
</code>

List disks

<code>
sysctl | grep -i hw.disknames
</code>

List Partiions

<code>
doas disklabel -h sd1
</code>

Unlock HDD
<code>
doas bioctl -c C -l sd1a softraid0
doas mkdir -p /mnt/mphdd
doas mount /dev/sd3a /mnt/mphdd
</code>

Unlock backup usb stick
<code>
doas bioctl -c C -l sd1a softraid0
doas mkdir -p /mnt/mpstick
doas mount /dev/sd3c /mnt/mpstick
</code>

Change HDD Password
<code>
doas bioctl -P sd2
</code>

Play Webcam (check permissions on /dev/video0)
<code>
mpv av://v4l2:/dev/video0
</code>

dhcprelay
<code>
rcctl enable dhcrelay
rcctl set dhcrelay flags -i $INTERFACE $DHCPSERVER
rcctl start dhcrelay
</code>

trace 
<code>
ktrace -t + python 1.py
kdump -f ktrace.out | grep -2 -i 'permission denied'
</code>

sync folders
<code>
(cd /mnt/home; tar cf - .) | (cd /mnt2; tar xpf -)
</code>

tcpdump
<code>
tcpdump -netolv -i <interface>
</code>

vim remote
<code>
vim scp://user@remotehost//etc/hosts
</code>

smtpd
<code>
smtpctl flush all 	# kill all
smtpctl schedule all 	# try again
</code>

Backup File
<code>
doas cp /etc/hosts{,.bak}
</code>

PF - insert rule on the fly
<code>
echo "pass log proto tcp from any to self port 22" | pfctl -nvf - | sort
</code>