gsmtap.py: Ported from scapy to socket
With the python module scapy the headers of each layer have to be created
by hand. Furthermore, in order to use it, the program would have to be
started as root.
Using sockets would be the better. The reason for using scapy was, that
it was the first best thing that I found when searching for python
socket communication.
The next step would be to open and close the socket only once instead
of every time an APDU is send to wireshark.
Furthermore, the ATR probably has to be treated differently from APDU packets.
diff --git a/usb_application/gsmtap.py b/usb_application/gsmtap.py
old mode 100644
new mode 100755
index 32977a4..96038ea
--- a/usb_application/gsmtap.py
+++ b/usb_application/gsmtap.py
@@ -1,6 +1,7 @@
#!/usr/bin/env python
-from scapy.all import IP, UDP, sr1
+import socket
+import array
ip="127.0.0.1"
port=4729
@@ -10,19 +11,14 @@
# FIXME: Is ATR something special?
def gsmtap_send_apdu(data):
-# Do we have performance penalty because the socket stays open?
- p=IP(dst=ip, src=ip)/UDP(sport=sp, dport=port)/(gsmtap_hdr+data)
-# FIXME: remove show and ans
- if p:
- p.show()
-
- ans = sr1(p, timeout=2)
- if ans:
- print(ans)
+ s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+ s.connect((ip, port))
+ s.send(gsmtap_hdr+data.tostring())
+ s.close()
if __name__ == '__main__':
cmds = ("\xa0\xa4\x00\x00\x02\x6f\x7e\x9f\x0f",
"\xa0\xd6\x00\x00\x0b\xff\xff\xff\xff\x09\xf1\x07\xff\xfe\x00\x03\x90\x00",
- );
+ )
for cmd in cmds:
- gsmtap_send_apdu(cmd)
+ gsmtap_send_apdu(array.array('B', cmd))