Sniffle is a sniffer for Bluetooth 5 and 4.x (LE) using TI CC1352/CC26x2 hardware.
Sniffle has a number of useful features, including:
- Support for BT5/4.2 extended length advertisement and data packets
- Support for BT5 Channel Selection Algorithms #1 and #2
- Support for all BT5 PHY modes (regular 1M, 2M, and coded modes)
- Support for sniffing only advertisements and ignoring connections
- Support for channel map, connection parameter, and PHY change operations
- Support for advertisement filtering by MAC address and RSSI
- Support for BT5 extended advertising (non-periodic)
- Support for capturing advertisements from a target MAC on all three primary advertising channels using a single sniffer. This makes connection detection nearly 3x more reliable than most other sniffers that only sniff one advertising channel.
- Easy to extend host-side software written in Python
- PCAP export compatible with the Ubertooth
- TI CC26x2R Launchpad Board: https://www.ti.com/tool/LAUNCHXL-CC26X2R1
- or TI CC2652RB Launchpad Board: https://www.ti.com/tool/LP-CC2652RB
- or TI CC1352R Launchpad Board: https://www.ti.com/tool/LAUNCHXL-CC1352R1
- GNU ARM Embedded Toolchain: https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads
- TI CC26x2 SDK 3.40.00.02: https://www.ti.com/tool/download/SIMPLELINK-CC13X2-26X2-SDK
- TI SysConfig 1.3.1030: https://www.ti.com/tool/download/SYSCONFIG
- TI DSLite Programmer Software: see below
- Python 3.5+ with PySerial installed
Note: it should be possible to compile Sniffle to run on CC1352P Launchpad boards with minimal modifications, but I have not yet tried this.
The arm-none-eabi-gcc provided through various Linux distributions' package
manager often lacks some header files or requires some changes to linker
configuration. For minimal hassle, I suggest using the ARM GCC linked above.
You can just download and extract the prebuilt executables.
The TI SDK is provided as an executable binary that extracts a bunch of source
code once you accept the license agreement. On Linux and Mac, the default
installation directory is inside~/ti/. This works fine and my makefiles
expect this path, so I suggest just going with the default here. The same
applies for the TI SysConfig tool.
Once the SDK has been extracted, you will need to edit one makefile to match
your build environment. Within ~/ti/simplelink_cc13x2_26x2_sdk_3_40_00_02
(or wherever the SDK was installed) there is a makefile named imports.mak.
The only paths that need to be set here to build Sniffle are for GCC, XDC, and
SysConfig. We don't need the CCS compiler. See the diff below as an example,
and adapt for wherever you installed things.
diff --git a/imports.mak b/imports.mak
index 94970e36..f530be4b 100644
--- a/imports.mak
+++ b/imports.mak
@@ -18,12 +18,12 @@
# will build using each non-empty *_ARMCOMPILER cgtool.
#
-XDC_INSTALL_DIR ?= /home/username/ti/xdctools_3_60_02_34_core
-SYSCONFIG_TOOL ?= /home/username/ti/ccs930/ccs/utils/sysconfig/sysconfig_cli.sh
+XDC_INSTALL_DIR ?= $(HOME)/ti/xdctools_3_60_02_34_core
+SYSCONFIG_TOOL ?= $(HOME)/ti/sysconfig_1.3.1030/sysconfig_cli.sh
-CCS_ARMCOMPILER ?= /home/username/ti/ccs930/ccs/tools/compiler/ti-cgt-arm_18.12.4.LTS
-GCC_ARMCOMPILER ?= /home/username/ti/ccs930/ccs/tools/compiler/gcc-arm-none-eabi-7-2017-q4-major
+CCS_ARMCOMPILER ?= $(HOME)/ti/ccs930/ccs/tools/compiler/ti-cgt-arm_18.12.4.LTS
+GCC_ARMCOMPILER ?= $(HOME)/arm_tools/gcc-arm-none-eabi-8-2018-q4-major
# The IAR compiler is not supported on Linux
# IAR_ARMCOMPILER ?=
DSLite is TI's command line programming and debug server tool for XDS110
debuggers. The CC26xx and CC13xx Launchpad boards both include XDS110 debuggers.
Unfortunately, TI does not provide a standalone command line DSLite download.
The easiest way to obtain DSLite is to install UniFlash
from TI. It's available for Linux, Mac, and Windows. The DSLite executable will
be located at deskdb/content/TICloudAgent/linux/ccs_base/DebugServer/bin/DSLite
relative to the UniFlash installation directory. On Linux, the default UniFlash
installation directory is inside ~/ti/.
You should place the DSLite executable directory within your $PATH.
Once the GCC, DSLite, and the SDK is installed and operational, building
Sniffle should be straight forward. Just navigate to the fw directory and
run make. If you didn't install the SDK to the default directory, you may
need to edit SIMPLELINK_SDK_INSTALL_DIR in the makefile.
To install Sniffle on a (plugged in) CC26x2 Launchpad using DSLite, run
make load within the fw directory. You can also flash the compiled
sniffle.out binary using the UniFlash GUI.
If building for or installing on a CC1352R Launchpad instead of a CC26x2R,
you must specify PLATFORM=CC1352R1F3, either as an argument to make, or
by defining it as an environment variable prior to invoking make. Be sure
to perform a make clean before switching between CC13x2 and CC26x2.
[skhan@serpent python_cli]$ ./sniff_receiver.py --help
usage: sniff_receiver.py [-h] [-s SERPORT] [-c {37,38,39}] [-p] [-r RSSI]
[-m MAC] [-a] [-e] [-H] [-l] [-o OUTPUT]
Host-side receiver for Sniffle BLE5 sniffer
optional arguments:
-h, --help show this help message and exit
-s SERPORT, --serport SERPORT
Sniffer serial port name
-c {37,38,39}, --advchan {37,38,39}
Advertising channel to listen on
-p, --pause Pause sniffer after disconnect
-r RSSI, --rssi RSSI Filter packets by minimum RSSI
-m MAC, --mac MAC Filter packets by advertiser MAC
-i IRK, --irk IRK Filter packets by advertiser IRK
-a, --advonly Sniff only advertisements, don't follow connections
-e, --extadv Capture BT5 extended (auxiliary) advertising
-H, --hop Hop primary advertising channels in extended mode
-l, --longrange Use long range (coded) PHY for primary advertising
-o OUTPUT, --output OUTPUT
PCAP output file name
The XDS110 debugger on the Launchpad boards creates two serial ports. On
Linux, they are typically named ttyACM0 and ttyACM1. The first of the
two created serial ports is used to communicate with Sniffle. By default,
the Python CLI communicates using /dev/ttyACM0, but you may need to
override this with the -s command line option if you are not running on
Linux or have additional USB CDC-ACM devices connected.
For the -r (RSSI filter) option, a value of -40 tends to work well if the
sniffer is very close to or nearly touching the transmitting device. The RSSI
filter is very useful for ignoring irrelevant advertisements in a busy RF
environment. The RSSI filter is only active when capturing advertisements,
as you always want to capture data channel traffic for a connection being
followed. You probably don't want to use an RSSI filter when MAC filtering
is active, as you may lose advertisements from the MAC address of interest
when the RSSI is too low.
To hop along with advertisements and have reliable connection sniffing, you
need to set up a MAC filter with the -m option. You should specify the
MAC address of the peripheral device, not the central device. To figure out
which MAC address to sniff, you can run the sniffer with RSSI filtering while
placing the sniffer near the target. This will show you advertisements from
the target device including its MAC address. It should be noted that many BLE
devices advertise with a randomized MAC address rather than their "real" fixed
MAC written on a label.
For convenience, there is a special mode for the MAC filter by invoking the
script with -m top instead of -m with a MAC address. In this mode, the
sniffer will lock onto the first advertiser MAC address it sees that passes
the RSSI filter. The -m top mode should thus always be used with an RSSI
filter to avoid locking onto a spurious MAC address. Once the sniffer locks
onto a MAC address, the RSSI filter will be disabled automatically by the
sniff receiver script (except when the -e option is used).
Most new BLE devices use Resolvable Private Addresses (RPAs) rather than fixed
static or public addresses. While you can set up a MAC filter to a particular
RPA, devices periodically change their RPA. RPAs can can be resolved (associated
with a particular device) if the Identity Resolving Key (IRK) is known. Sniffle
supports automated RPA resolution when the IRK is provided. This avoids the need
to keep updating the MAC filter whenever the RPA changes. You can specify an
IRK for Sniffle with the -i option; the IRK should be provided in hexadecimal
format, with the most significant byte (MSB) first. Specifying an IRK allows
Sniffle to channel hop with an advertiser the same way it does with a MAC filter.
The IRK based MAC filtering feature (-i) is mutually exclusive with the static
MAC filtering feature (-m).
To enable following auxiliary pointers in Bluetooth 5 extended advertising,
enable the -e option. To improve performance and reliability in extended
advertising capture, this option disables hopping on the primary advertising
channels, even when a MAC filter is set up. If you are unsure whether a
connection will be established via legacy or extended advertising, you can
enable the -H flag in conjunction with -e to perform primary channel
hopping with legacy advertisements, and scheduled listening to extended
advertisement auxiliary packets. When combining -e and -H, the
reliability of connection detection may be reduced compared to hopping on
primary (legacy) or secondary (extended) advertising channels alone.
To sniff the long range PHY on primary advertising channels, specify the -l
option. Note that no hopping between primary advertising channels is supported
in long range mode, since all long range advertising uses the BT5 extended
mechanism. Under the extended mechanism, auxiliary pointers on all three
primary channels point to the same auxiliary packet, so hopping between
primary channels is unnecessary.
If for some reason the sniffer firmware locks up and refuses to capture any traffic even with filters disabled, you should reset the sniffer MCU. On Launchpad boards, the reset button is located beside the micro USB port.
sultan@sultan-neon-vm:~/sniffle/python_cli$ ./scanner.py --help
usage: scanner.py [-h] [-s SERPORT] [-c {37,38,39}] [-r RSSI] [-e] [-l]
Scanner utility for Sniffle BLE5 sniffer
optional arguments:
-h, --help show this help message and exit
-s SERPORT, --serport SERPORT
Sniffer serial port name
-c {37,38,39}, --advchan {37,38,39}
Advertising channel to listen on
-r RSSI, --rssi RSSI Filter packets by minimum RSSI
-e, --extadv Capture BT5 extended (auxiliary) advertising
-l, --longrange Use long range (coded) PHY for primary advertising
The scanner command line arguments work the same as the sniffer. The purpose of the scanner utility is to passively gather a list of nearby devices advertising, without having the deluge of fast scrolling data you get with the sniffer utility. The hardware/firmware works exactly the same, but the scanner utility will record and report observed MAC addresses only once without spamming the display. Once you're done capturing advertisements, press Ctrl-C to stop scanning and report the results. The scanner will show the last advertisement and scan response from each target. Scan results will be sorted by RSSI in descending order.
Sniff all advertisements on channel 38, ignore RSSI < -50, stay on advertising channel even when CONNECT_REQs are seen.
./sniff_receiver.py -c 38 -r -50 -a
Sniff advertisements from MAC 12:34:56:78:9A:BC, stay on advertising channel
even when CONNECT_REQs are seen, save advertisements to data1.pcap.
./sniff_receiver.py -m 12:34:56:78:9A:BC -a -o data1.pcap
Sniff advertisements and connections for the first MAC address seen with
RSSI >= -40. The RSSI filter will be disabled automatically once a MAC address
has been locked onto. Save captured data to data2.pcap.
./sniff_receiver.py -m top -r -40 -o data2.pcap
Sniff advertisements and connections from the peripheral with big endian IRK 4E0BEA5355866BE38EF0AC2E3F0EBC22.
./sniff_receiver.py -i 4E0BEA5355866BE38EF0AC2E3F0EBC22
Sniff BT5 extended advertisements and connections from nearby (RSSI >= -55) devices.
./sniff_receiver.py -r -55 -e
Sniff legacy and extended advertisements and connections from the device with the
specified MAC address. Save captured data to data3.pcap.
./sniff_receiver.py -eH -m 12:34:56:78:9A:BC -o data3.pcap
Sniff extended advertisements and connections using the long range primary PHY on channel 38.
./sniff_receiver.py -le -c 38
Passively scan on channel 39 for advertisements with RSSI greater than -50, and enable capture of extended advertising.
./scanner.py -c 39 -e -r -50
If you have a rooted Android phone, you can find IRKs (and LTKs) in the Bluedroid
configuration file. On Android 8.1, this is located at /data/misc/bluedroid/bt_config.conf.
The LE_LOCAL_KEY_IRK specifies the Android device's own IRK, and the first 16
bytes of LE_KEY_PID for every bonded device in the file indicate the bonded
device's IRK. Be aware that keys stored in this file are little endian, so
the byte order of keys in this file will need to be reversed. For example,
the little endian IRK 22BC0E3F2EACF08EE36B865553EA0B4E needs to be changed to
4E0BEA5355866BE38EF0AC2E3F0EBC22 (big endian) when being passed to Sniffle with
the -i option.