*UDP Port (4729) Conflict Between SIMTrace2 and pySim*
Hello community/admin,
I am experiencing an issue while using *SIMTrace2* and *pySim* to sniff and
analyze SIM card communication. Below are the details:
------------------------------
*1. When SIMTrace2 Sniff is Turned Off*
I run the following command:
bash
pySim-trace.py gsmtap-udp
*Output*:
plaintext
Copy code
INFO root: Opening source gsmtap-udp...
Detected UICC Add-on "SIM"
Detected UICC Add-on "GSM-R"
Detected UICC Add-on "RUIM"
Can't read AIDs from SIM -- 'list' object has no attribute 'lower'
warning: EF.DIR seems to be empty!
ADF.ECASD: a0000005591010ffffffff8900000200
ADF.ISD-R: a0000005591010ffffffff8900000100
ISIM: a0000000871004
USIM: a0000000871002
INFO root: Entering main loop...
When I check the UDP port (4729) usage:
bash
sudo lsof -i :4729
*Output*:
plaintext
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
python3 198340 jun 4u IPv4 301846 0t0 UDP localhost:4729
------------------------------
*2. When SIMTrace2 Sniff is Turned On*
I run the following command:
bash
simtrace2-sniff
*Output*:
plaintext
simtrace2-sniff - Phone-SIM card communication sniffer
(C) 2010-2017 by Harald Welte <laforge(a)gnumonks.org>
(C) 2018 by Kevin Redon <kredon(a)sysmocom.de>
Using USB device 1d50:60e3 Addr=46, Path=1-5, Cfg=1, Intf=0, Alt=0:
255/1/0 (SIMtrace Sniffer)
Entering main loop
ATR: 3b 9f 96 80 1f c7 80 31 e0 73 fe 21 11 57 86 81 27 86 98 60 58 ec
PPS: ff 00 ff
TPDU: a0 a4 00 00 02 7f 20 9f 17
TPDU: a0 c0 00 00 17 00 00 00 00 7f 20 02 00 00 00 00 00 0a 93 00 1c
04 00 83 8a 83 8a 00 90 00
When I check the UDP port (4729) usage:
bash
sudo lsof -i :4729
*Output*:
plaintext
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
simtrace2 198351 jun 7u IPv4 308389 0t0 UDP
localhost:36190->localhost:4729
simtrace2 198351 jun 8u IPv4 308390 0t0 UDP localhost:4729
------------------------------
*UDP Port (4729) Conflict Between SIMTrace2 and pySim*
Hello community/admin,
I am experiencing an issue while using *SIMTrace2* and *pySim* to sniff and
analyze SIM card communication. Below are the details:
------------------------------
*1. When SIMTrace2 Sniff is Turned Off*
I run the following command:
bash
Copy code
/usr/src/pysim/pySim-trace.py gsmtap-udp
*Output*:
plaintext
Copy code
INFO root: Opening source gsmtap-udp...
Detected UICC Add-on "SIM"
Detected UICC Add-on "GSM-R"
Detected UICC Add-on "RUIM"
Can't read AIDs from SIM -- 'list' object has no attribute 'lower'
warning: EF.DIR seems to be empty!
ADF.ECASD: a0000005591010ffffffff8900000200
ADF.ISD-R: a0000005591010ffffffff8900000100
ISIM: a0000000871004
USIM: a0000000871002
INFO root: Entering main loop...
When I check the UDP port (4729) usage:
bash
sudo lsof -i :4729
*Output*:
plaintext
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
python3 198340 jun 4u IPv4 301846 0t0 UDP localhost:4729
------------------------------
*2. When SIMTrace2 Sniff is Turned On*
I run the following command:
bash
simtrace2-sniff
*Output*:
plaintext
simtrace2-sniff - Phone-SIM card communication sniffer
(C) 2010-2017 by Harald Welte <laforge(a)gnumonks.org>
(C) 2018 by Kevin Redon <kredon(a)sysmocom.de>
Using USB device 1d50:60e3 Addr=46, Path=1-5, Cfg=1, Intf=0, Alt=0:
255/1/0 (SIMtrace Sniffer)
Entering main loop
ATR: 3b 9f 96 80 1f c7 80 31 e0 73 fe 21 11 57 86 81 27 86 98 60 58 ec
PPS: ff 00 ff
TPDU: a0 a4 00 00 02 7f 20 9f 17
TPDU: a0 c0 00 00 17 00 00 00 00 7f 20 02 00 00 00 00 00 0a 93 00 1c
04 00 83 8a 83 8a 00 90 00
When I check the UDP port (4729) usage:
bash
sudo lsof -i :4729
*Output*:
plaintext
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
simtrace2 198351 jun 7u IPv4 308389 0t0 UDP
localhost:36190->localhost:4729
simtrace2 198351 jun 8u IPv4 308390 0t0 UDP localhost:4729
------------------------------
*3. When Running SIMTrace2 Sniff and pySim-trace.py Together*
If I try to run both *SIMTrace2 sniff* and *pySim-trace.py gsmtap-udp*
simultaneously, I get the following error from *pySim*:
plaintext
jun@jun-RDR:pySim-trace.py gsmtap-udp
INFO root: Opening source gsmtap-udp...
Traceback (most recent call last):
File "pySim-trace.py", line 199, in <module>
s = GsmtapApduSource(opts.bind_ip, opts.bind_port)
File "pysim/pySim/apdu_source/gsmtap.py", line 44, in __init__
self.gsmtap = GsmtapReceiver(bind_ip, bind_port)
File "/home/jun/.local/lib/python3.10/site-packages/osmocom/gsmtap.py",
line 207, in __init__
self.sock.bind((self.bind_ip, self.bind_port))
OSError: [Errno 98] Address already in use
------------------------------
*Main Issue*
1. When *SIMTrace2 sniff* is running, it occupies UDP port 4729,
preventing *pySim* from using the same port.
2. When SIMTrace2 sniff is stopped, *pySim* can access UDP port 4729 but
fails to decode data, showing the following errors:
plaintext
Can't read AIDs from SIM -- 'list' object has no attribute 'lower'
warning: EF.DIR seems to be empty!
3. If I try to run both tools at the same time, *pySim* crashes with the
error [Errno 98] Address already in use.
------------------------------
*Request for Help*
- Has anyone experienced a similar issue when running *SIMTrace2* and
*pySim* together?
- How can I avoid the port conflict and ensure both tools can run
simultaneously?
- What could cause the decoding error and the warning about an empty
EF.DIR in *pySim*?
Any insights or advice would be greatly appreciated. Thank you!
