gsm/umts traces with xgoldmon

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https://github.com/2b-as/xgoldmon.gi

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latest commit f2d5372ace

Convert log messages by phones with XGold baseband processor back to GSM/UMTS radio messages

README update

2b-as authored 4 months ago

COPYING xgoldmon initial git import a year ago

Makefile Update Makefile to also compile on Ubuntu a year ago

README README update 4 months ago

logparse.c Use new GSMTAP identifiers for RRC messages a year ago

readlog.c minor cleanup a year ago

screenshot-mtsms-while-in- Added screenshot a year ago

util.c xgoldmon initial git import a year ago

xgoldmon.c Add GT-I9500 to supported devices 4 months ago

xgoldmon.h initial support for the galaxy note2 a year ago

README README

xgoldmon

========

xgoldmon is a small tool to convert the messages output by the USB

logging mode of phones with Intel/Infineon XGold baseband processor

back to the GSM/UMTS radio messages sent over the air so you can watch

them in e.g. Wireshark in realtime.

This includes signalling for calls, SMS, USSD, paging for your and

other phones and so on.

Currently, these devices are supported:

- Samsung Galaxy S4 GT-I9500 (this is the version without LTE!)

- Samsung Galaxy S3 GT-I9300

- Samsung Galaxy Nexus GT-I9250 (has to be rooted!)

- Samsung Galaxy S2 GT-I9100

- Samsung Galaxy Note 2 GT-N7100

Patches for other devices or to decode more messages are very much

welcome!

-Tobias Engel

Mail: [email protected]

Twitter: @2b_as

How to build

============

xgoldmon has been tested on Linux and OSX.

As a prerequisite, a recent version of libosmocore has to be

installed. See here for instructions:

http://bb.osmocom.org/trac/wiki/libosmocore (If you install it in a

non-standard location please set PKG_CONFIG_PATH accordingly.)

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Then run "make" in the xgoldmon directory. An xgoldmon binary should

be created.

Before running xgoldmon

=======================

To enable the logging mode ("diag mode") on the S2, S3 and Note2:

- Go to the Phone application, enter *#9900# and set "Debug Level

Enabled" to "HIGH". The phone will reboot.

- Go to the Phone application again, enter *#7284# and set "USB" to

"MODEM" and tap "SAVE and RESET". The phone will reboot again.

The Galaxy Nexus has to be rooted first to activate diag mode! Then:

- In the adb shell, as root, enter:

echo MODEM > /sys/devices/tuna_otg/usb_sel

- Connect to the first of the serial devices (e.g. /dev/ttyACM0) with

a terminal emulator and enter

AT+TRACE=1

When connecting the phone via USB to the computer, several new

pseudo-tty devices should be created. The one with the second lowest

number should be the logging port. So for example on Linux, if you

have no other ttyACM* devices, it should be /dev/ttyACM1.

xgoldmon tries to set proper serial attributes on the device if the

"-s" option is specified. If that fails, you might have to do that

yourself with something like

stty 115200 pass8 raw -noflsh -F /dev/ttyACM1

Running xgoldmon

================

E.g.:

xgoldmon -t s3 -l /dev/ttyACM1

Full usage:

usage: ./xgoldmon [-t ] [-l] [-s] [-i ] [-v]

-t: select 's4', 's3', 'gnex', 's2' or 'note2' (default: 's3')

-l: print baseband log messages

-s: set proper serial device attributes

-i: send gsmtap packets to given ip address (default: 'localhost')

-v: show debugging messages (more than once for more messages)

In some situations, the phone might close the device, causing xgoldmon

to exit. If you want to do some unsupervised logging, it might be a

good idea to put the call to xgoldmon in a loop.

Watching the radio messages in Wireshark

========================================

xgoldmon uses libosmocore to send the radio messages in GSMTAP format

(http://bb.osmocom.org/trac/wiki/GSMTAP) to UDP port 4729 on the local

host. In order to monitor the packages with Wireshark, something has

to listen on that port, e.g.

nc -u -l 4729

Then, in Wireshark, start a capture on the loopback interface. To see

only the GSMTAP messages, set this filter:

udp.port==4729

GSM messages will be decoded out-of-the box in Wireshark. For UMTS/RRC

messages, you need a recent development version of Wireshark (at least

revision 47792), which you most likely will have to build yourself.


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If everything works, it should look a bit like the

"screenshot-mtsms-while-in-a-call.png".

It contains a screenshot of Wireshark that shows an S3 receiving a

text message while in a call. (Lots of messages filtered out to show

the more relevant messages)

Thanks

======

Many thanks to...

* Harald Welte and GSMK Cryptophone for their support in making this

tool

* Nico Golde (@iamnion) for adding support for the Note 2

* Yan Grunenberger (@yangrunenberger) for finding out how to activate

diag mode on the Galaxy Nexus

* Max for adding options to set serial attributes and gsmtap ip address

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gsm/umts traces with xgoldmon

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