300. Briefly: Sharing a folder using SAMBA on Debian

I don't ever use samba, but it's not a bad thing to know how to set up in case you need to share files with someone using Windows in a pinch.

First install samba:

sudo apt-get install samba samba-common smbclient

To get a share up with samba, create an /etc/samba/smb.conf and stick the following in it:

[global]
workgroup=WORKGROUP
guest account=nobody
security=shared

[asharedfolder]
path=/home/lindqvist/shared
guest ok=yes
read only=no
writable=yes
browsable=yes
comment= SMB share

Restart samba:

sudo service samba restart

1. This is an insecure share i.e. <b>anyone can access it</> and edit everything.
2.. Also, by omitting "netbios name=  " you can use the IP address of the server as the hostname, but you could also specify e.g. "netbios name=niobium" and use that as the hostname in nautilus when you connect to the host server.

To set up a user- and password-based share, do

[global]
workgroup=WORKGROUP
security=user

[asharedfolder]
path=/home/lindqvist/shared
guest ok=no
read only=no
writable=yes
browsable=yes
comment= SMB share

You need to add and set the samba password, and enable the linux user you want to give access as well:

sudo smbpasswd -L -a -e lindqvist

---

There are a lot of other options that can be set. Two of the more interesting ones are probably

[asharedfolder]
createmask=0755
valid users=me myself irene

which means that any new files created in that share via samba gets chmod 755, and only the users me, myself and irene can connect.

But often a basic smb.conf is easier to manage and will do what you want it to.

299. Briefly: Start autossh at boot on debian testing/wheezy

I have one of my work computers set up to create a reverse tunnel to my WRT54G router at home, so that by login in to my router at home and then connecting to localhost:19996 I can access my work network from home. The problem is that if I reboot my work computer remotely I need to make sure that it tries to recreate the reverse ssh tunnel.

The way to do that is by editing /etc/rc.local and putting the following in it:

su lindqvist -c 'autossh -N -f -M 29001 -R 19996:localhost:22 remoteuser@my.router.com' &

Make sure you put it before the line that says

exit 0

linqdvist is the user at on my work computer I want to be running the autossh, 19996 is the port I'll connect to on my home router to gain access to the ssh port on my work computer. Since I'm using WRT54G with Tomato the remoteuser is root, and I got my dns (remote hostname) as shown in this post: http://verahill.blogspot.com.au/2012/02/tomato-router-and-free-dns.html
It's that simple.

298. Hantek DSO 2250 USB with Openhantek on Debian Testing/Wheezy /Linux

Update 23 May 2013: Updated as per Peter Jeffris' suggestion (see below)/

UPDATE: this has been updated as per the developer's (Oliver Haag) recommendations (see first comment)

Original post:
I wanted to get Hantek DSO-2250 USB running on debian. I first tried openhantek 0.2.0 but it doesn't support the DSO-2250, so I ended up using the development version. I had to get the configure and Makefile.in files from another source though (see below).

I finally got the scope to work as shown below -- I primarily needed it for some work on NMR probes I did two years ago, but better late than never.

Probe set to X1

Probe set to X10

Before installing anything, on plugging in the oscilloscope we get:
dmesg

[10885.993061] usb 2-2: USB disconnect, device number 3
[10894.913984] usb 1-2: new high-speed USB device number 9 using ehci_hcd
[10895.046104] usb 1-2: New USB device found, idVendor=04b4, idProduct=2250
[10895.046117] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[10895.398887] usb 1-2: USB disconnect, device number 9
[10895.668190] usb 1-2: new high-speed USB device number 10 using ehci_hcd
[10895.800317] usb 1-2: New USB device found, idVendor=04b4, idProduct=2250
[10895.800330] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0

lsusb

Bus 001 Device 010: ID 04b4:2250 Cypress Semiconductor Corp.

Openhantek

sudo apt-get install subversion autoconf automake build-essential unrar
cd ~/tmp
svn checkout http://svn.code.sf.net/p/openhantek/code/trunk openhantek-code
cd openhantek-code/
sudo apt-get install libqt4-dev libfftw3-dev qt4-qmake fxload libusb-1.0-0-dev libbfd-dev
cd openhantek/
qmake
make
sudo make install
cd ../openhantek-extractfw/
aclocal && autoconf && automake
./configure
make
wget http://www.hantek.com.cn/Product/32Driver/2250/Driver.rar
unrar x Driver.rar

UNRAR 4.10 freeware      Copyright (c) 1993-2012 Alexander Roshal


Extracting from Driver.rar

Creating    Driver                                                    OK
Extracting  Driver/DSO22501.sys                                       OK 
Extracting  Driver/DSO22502.sys                                       OK 
Extracting  Driver/dso2250usb.inf                                     OK 
All OK

./openhantek-extractfw Driver/DSO22501.sys 

BFD: Driver/DSO22501.sys: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .text
BFD: Driver/DSO22501.sys: Warning: Ignoring section flag IMAGE_SCN_MEM_NOT_PAGED in section .data
Section .data found (starting at 0x08a0, 9504 bytes)
Symbol _firmware found (offset 0x0000, 8184 bytes)
Symbol _loader found (offset 0x1ff8, 1320 bytes)
Saving firmware as Driver/dso2250-firmware.hex
Saving loader as Driver/dso2250-loader.hex

sudo mkdir -p /usr/local/share/hantek
sudo cp Driver/*.hex /usr/local/share/hantek/

While tempting (the ID shows up as 04b4 above), do NOT change the part marked in red in 90-hantek.rules since changing it requires you to run as root. It works fine as user if you leave it alone.

 13 # Hantek DSO-2250
 14 SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", ENV{PRODUCT}=="4b4/2250/*", RUN+="/sbin/fxload -t fx2 -I /usr/local/share/hantek/dso2250-firmware.hex -s /usr/local/share/hantek/dso2250-loader.hex -D $env{DEVNAME}"
 15 SYSFS{idVendor}=="04b5", SYSFS{idProduct}=="2250", MODE="0660", GROUP="plugdev"

sudo cp 90-hantek.rules /etc/udev/rules.d/

sudo service udev restart
sudo usermod -a -G plugdev $USER

Plug in your oscilloscope:

[ 4216.277235] udevd[23240]: starting version 175
[ 4246.532221] usb 2-2: new high-speed USB device number 5 using ehci_hcd
[ 4246.664559] usb 2-2: New USB device found, idVendor=04b4, idProduct=2250
[ 4246.664570] usb 2-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 4246.718694] usb 2-2: USB disconnect, device number 5
[ 4248.492214] usb 2-2: new high-speed USB device number 6 using ehci_hcd
[ 4248.625224] usb 2-2: New USB device found, idVendor=04b5, idProduct=2250
[ 4248.625238] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4248.625246] usb 2-2: Product: DSO-2250 
[ 4248.625252] usb 2-2: Manufacturer: ODM

At this point the light on the oscilloscope was blinking red.

openhantek

Check the 'show spectrum' thingy (I'm running this with the probe on CH1 connected to the square wave cal at the back of the scope).

Done.