the life and times of dmitri alenitchev

drinkathon 2k6b

2006-12-11T18:00:00.000+03:00

Announcement at events page
Discussion at Undeadly

This event was started at Friday's evening and ended at Saturday's night. We start drinking at bar "Bavarius" and after some beer go to the night club, called "Hungry Duck".

Many good peoples come to this meeting.

reflection of the sun

2006-12-07T03:29:00.000+03:00

Reflection of the sun
On the stained glass
Yet another one
Day with smoked grass

audacious port for openbsd

2006-12-04T00:01:00.001+03:00

And, finally, it's done. Audacious media player port for openbsd.

updated: x11/ion

2006-12-03T02:40:00.000+03:00

While I was in psychedelic trip, I become maintainer of x11/ion port in OpenBSD ;)

strange psychedelic trip

2006-12-01T20:54:00.000+03:00

Today.. acidless trip. Absinthe hallucinogenic effects compounded with placebo effect by sonapax. Smoking legalized Salvia divinorum open doors of perception.

Small trip report:

Creativity becomes apparent, natural brain filter is bypassed, some confusing of the senses;
Strong visual effects: fractal images seen everywhere, everything looking curved, objects morphing into other objects, closed eye hallucinations become 3 dimensional.
Time becomes meaningless.
Extra sensory perceptions and abilities.
Merging with space, other objects or the universe.

Psychedelic art was born after trip:

I'm not forgot about psychedelic electronic effects in music and for deposit of good trip listening the following kings of psychedelic rock:

Jefferson Airplane - Volunteers
Jefferson Airplane - Surrealistic Pillow
Pink Floyd - The Piper at the Gates of Dawn
Pink Floyd - A Saucerful of Secrets
Syd Barrett - The Madcap Laughs
Syd Barrett - Barrett

temp sensors and mrtg

2006-11-29T15:33:00.000+03:00

Temperature monitoring using openbsd's sensor framework and mrtg.

Locate sensors on main board:
$ dmesg | grep lm
lm0 at isa0 port 0x290/8: LM79
Locate number of CPU temperature sensor:
$ sysctl hw.sensors | grep temp
hw.sensors.7=lm0, Temp1, temp, 36.00 degC / 96.80 degF
Write a simple script for passing temperature to mrtg:
#!/bin/sh
sysctl hw.sensors.7 | awk '{ print $4 }'
sysctl hw.sensors.7 | awk '{ print $4 }'
Add the following lines to your mrtg config:
Target[Temp1]: `/root/temp.sh`
MaxBytes[Temp1]: 70
Options[Temp1]: gauge, noinfo, nopercent
YLegend[Temp1]: Celsius
LegendI[Temp1]: Temp
LegendO[Temp1]: Temp
Title[Temp1]: CPU temp
ShortLegend[Temp1]: C
PageTop[Temp1]: <h1>CPU temp</h1>
Have fun!

asus wl-500g premium

2006-11-26T16:21:00.000+03:00

i got one wl-500g router for my home:

1 wan ethernet
4 lan ethernet
2 usb
wi-fi

here is uname string:

Linux 1 2.4.20 #46 Thu May 25 22:40:57 MSD 2006 mips unknown

some of cpuinfo:

system type : Broadcom BCM947XX
cpu model : BCM3302 V0.6
BogoMIPS : 262.96
wait instruction : no
microsecond timers : yes
tlb_entries : 32

many nice features of this router can be used in custom firmware.

going to new blogger

2006-11-25T23:00:00.000+03:00

after some months of blogging @ wordpress.com I'm here. ;)
so, best posts from old blog will be merged here soon.

palm z22

2006-11-22T20:11:00.000+03:00

I was bought new toy: Palm Zire 22. It is a Samsung 200MHz ARM processor based PDA with 32MB RAM (20MB accessible) and color 160×160 touchscreen display. Its weight is only 96g.

Nice PDA for typically tasks of most users.

pf based nat gateway for office network

2006-10-20T13:30:00.000+04:00

Tonight i replace old FreeBSD based NAT gateway to OpenBSD based NAT gateway and firewall. This is short article about pf configuration.

I use Intel Celeron 500MHz based server with two network cards (vr0 and vr1). Here is configuration steps:

buy more beer and pizza!
install openbsd
set net.inet.ip.forwarding sysctl value to “1” and add string net.inet.ip.forwarding=1 to /etc/sysctl.conf file
activate pf. add pf=YES line to /etc/rc.conf.local file
let’s edit /etc/pf.conf file:
# macros
ext_if="vr0"
int_if="vr1"

# options
set block-policy return
set loginterface $ext_if
set skip on lo

# scrub
scrub in

# network address translation (NAT)
nat on $ext_if from !($ext_if) to any -> ($ext_if)

#filter
block in
pass out keep state
antispoof quick for { lo $int_if }
pass quick on $int_if
load config file. pfctl -f /etc/pf.conf

…and read “The OpenBSD Packet Filter”.

hacking usb device drivers->part 2

2006-10-02T16:10:00.000+04:00

This is the second article from “Hacking USB device drivers” series. In this part will be covered device supporting mechanism by USB device drivers.

Adding vendor and product IDs for USB drivers (read)
Adding support for new devices to USB drivers

Introduction
Modify dev_devs[] structure

Adding support for new devices to USB drivers

Introduction
All USB devices have vendor ID, product ID and device class. USB device can be attached to driver allocated with supported IDs and/or classes. Typically in USB driver you can see dev_devs[] structure, where dev is a device name. In this structure listed supported products.
USB device drivers can be founded in /usr/src/sys/dev/usb/ directory.

Modify dev_devs[] structure
For example, in uplcom(4) driver uplcom_devs[] structure contain strings like following line:

{ USB_VENDOR_SIEMENS3, USB_PRODUCT_SIEMENS3_X75 },

These lines can be founded in usbdevs_data.h file:

{
USB_VENDOR_SIEMENS3, USB_PRODUCT_SIEMENS3_X75,
"X75",
},

For adding support of new product to USB device driver all you need is modify dev_devs[] structure.

hacking usb device drivers->part 1

2006-09-27T17:30:00.000+04:00

This is the first article from “Hacking USB device drivers” series. In this part briefly review of one very simple hack: adding missed vendor and product IDs for USB drivers.

Adding vendor and product IDs for USB drivers

Introduction
Changing USB IDs database
Result

Adding support for new devices to USB drivers (read)

Adding vendor and product IDs for USB drivers

Introduction
I have USB Bluetooth adapter and after plugging this device i got the following new strings in dmesg:

ubt0 at uhub2 port 2 configuration 1 interface 0
ubt0: vendor 0x1131 ISSCBTA, rev 1.10/3.73, addr 2

That’s mean: driver ubt(4) support this device, but vendor and product IDs not present in /usr/src/sys/dev/usb/usbdevs file. Let’s fix it!

Changing USB IDs database
Add the following lines to /usr/src/sys/dev/usb/usbdevs file:

vendor ISSC 0x1131 Integrated System Solution Corp.
...
/* ISSC products */
product ISSC ISSCBTA 0x1001 KY-BT100

Vendor ID must be placed to beginning of file, after vendor with lesser ID. Product IDs must be written in alphabetical order of vendor string. This patch illustrate this rule. And, finally, run make in /usr/src/sys/dev/usb directory for updating usbdevs.h and usbdevs_data.h files.

Result
Now you can build new kernel. Reboot, attach the device and run dmesg. Here is what you finally got:

ubt0 at uhub2 port 2 configuration 1 interface 0
ubt0: Integrated System Solution Corp. KY-BT100, rev 1.10/3.73, addr 2

scan with netcat

2006-09-08T13:47:00.000+04:00

nc(1) can be used for simple and fast network scan. Here is sample of localhost scan (ports range: 1-1024).

$ nc -v -z 127.0.0.1 1-1024
localhost [127.0.0.1] 80 (www) open
localhost [127.0.0.1] 25 (smtp) open
localhost [127.0.0.1] 22 (ssh) open

secure surfing from public place

2006-09-07T13:59:00.000+04:00

Use OpenSSH port forwarding to browse web from public place.
ssh(1) can act as a SOCKS server. SOCKS4 and SOCKS5 protocols are supported. All you need is shell access to remote machine.
Example:

ssh -D 4545 user@IP

Now you can specify “localhost” as SOCKS host and “4545” as SOCKS port in connections settings of your browser.

security engineering - the book

2006-09-07T12:42:00.000+04:00

Available online now for downloading by chapters.
Security Engineering: A Guide to Building Dependable Distributed Systems

using trunk(4) interface in openbsd

2006-08-26T23:48:00.000+04:00

In OpenBSD you can use trunk(4) interface for creating link aggregation and link failover.

Introduction
The trunk(4) interface support was added in OpenBSD since 3.9 version (last release at present moment) for allowing link aggregation and link failover. One virtual trunk(4) interface can be created from multiple network interfaces.

Example
Simple example, creating failover trunk, using two Gigabit Ethernet interfaces and one wireless interface:

# ifconfig bge0 up
# ifconfig bge1 up
# ifconfig ath0 nwid test_network up
# ifconfig trunk0 trunkproto failover trunkport bge0 trunkport bge1 trunkport ath0 192.168.0.1 netmask 255.255.255.0

Of course, in this example, loadbalance also can be used.

Links

remote ipfw module loading

2006-04-17T19:26:00.000+04:00

Remote ipfw module loading dangerous, because, if your firewall rules don’t right, you can lose remote access to the server. To prevent this create at(1) job with `kldunload ipfw’ command. If module loaded and you can login to server remotly with ssh(1) client just delete this job.
Checklist:

Create /etc/rc.firewall script with ipfw rules;
Make sure about remote access using ssh(1) through firewall;
Create at(1) job with `kldunload ipfw’;
Load ipfw module using `kldload ipfw’;
Try got access to allowed services;
If all right delete at(1) job.