| #!/usr/bin/env python2.7 |
| |
| """ |
| AGPLv3+ 2016 Copyright Holger Hans Peter Freyther |
| |
| Example of how to connect to the USSD side-channel and how to respond |
| with a fixed message. |
| """ |
| |
| import socket |
| import struct |
| |
| ussdSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| ussdSocket.connect(('127.0.0.1', 5001)) |
| |
| def send_dt1(dstref, data): |
| dlen = struct.pack('B', len(data)).encode('hex') |
| hex = '06' + dstref.encode('hex') + '00' + '01' + dlen + data.encode('hex') |
| pdata = hex.decode('hex') |
| out = struct.pack('>HB', len(pdata), 0xfd) + pdata |
| ussdSocket.send(out) |
| |
| def send_rel(srcref, dstref): |
| hex = '04' + dstref.encode('hex') + srcref.encode('hex') + '000100' |
| pdata = hex.decode('hex') |
| out = struct.pack('>HB', len(pdata), 0xfd) + pdata |
| ussdSocket.send(out) |
| |
| def recv_one(): |
| plen = ussdSocket.recv(3) |
| (plen,ptype) = struct.unpack(">HB", plen) |
| data = ussdSocket.recv(plen) |
| |
| return ptype, data |
| |
| # Assume this is the ID request |
| data = ussdSocket.recv(4) |
| ussdSocket.send("\x00\x08\xfe\x05\x00" + "\x05\x01" + "ussd") |
| # ^len ^len of tag ... and ignore |
| |
| # Expect a fake message. see struct ipac_msgt_sccp_state |
| ptype, data = recv_one() |
| print("%d %s" % (ptype, data.encode('hex'))) |
| (srcref, dstref, transid, invokeid) = struct.unpack("<3s3sBB", data[1:9]) |
| print("New transID %d invoke %d" % (transid, invokeid)) |
| |
| # Expect a the invocation.. todo.. extract invoke id |
| ptype, data = recv_one() |
| print("%d %s" % (ptype, data.encode('hex'))) |
| |
| # Reply with BSSAP + GSM 04.08 + MAP portion |
| # 00 == invoke id 0f == DCS |
| res = "01002a9b2a0802e1901c22a220020100301b02013b301604010f041155e7d2f9bc3a41412894991c06a9c9a713" |
| send_dt1(dstref, res.decode('hex')) |
| |
| clear = "000420040109" |
| send_dt1(dstref, clear.decode('hex')) |
| |
| # should be the clear complete |
| send_rel(srcref, dstref) |
| |
| # Give it some time to handle connection shutdown properly |
| print("Gracefully sleeping") |
| import time |
| time.sleep(3) |