1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#!/usr/bin/env python2
# Python interface to OsmoNITB MNCC (Mobile Network Call Control)
# interface
#
# (C) 2015 by Harald Welte <laforge@gnumonks.org>
# (C) 2018 by Vadim Yanitskiy <axilirator@gmail.com>
#
# Licensed under GNU General Public License, Version 2 or at your
# option, any later version.
import socket
import sys
import os
import mncc
import ctypes
class mncc_msg_common:
def send(self):
return buffer(self)[:]
def receive(self, bytes):
fit = min(len(bytes), ctypes.sizeof(self))
ctypes.memmove(ctypes.addressof(self), bytes, fit)
# Message type matching
def is_rtp(self):
return self.msg_type in (mncc.MNCC_RTP_CREATE,
mncc.MNCC_RTP_CONNECT, mncc.MNCC_RTP_FREE)
class mncc_msg(mncc.gsm_mncc, mncc_msg_common):
def __str__(self):
return 'mncc_msg(type=0x%04x, callref=%u, fields=0x%04x)' % (self.msg_type, self.callref, self.fields)
def __unicode__(self):
return u'mncc_msg(type=0x%04x, callref=%u, fields=0x%04x)' % (self.msg_type, self.callref, self.fields)
class mncc_hello_msg(mncc.gsm_mncc_hello, mncc_msg_common):
def __str__(self):
return 'mncc_hello_msg(version=0x%04x)' % (self.version)
def __unicode__(self):
return u'mncc_hello_msg(version=0x%04x)' % (self.version)
class mncc_rtp_msg(mncc.gsm_mncc_rtp, mncc_msg_common):
def __str__(self):
return 'mncc_rtp_msg(type=0x%04x, callref=%u, ip=%x, port=%u)' % (self.msg_type, self.callref, self.ip, self.port)
def __unicode__(self):
return u'mncc_rtp_msg(type=0x%04x, callref=%u, ip=%x, port=%u)' % (self.msg_type, self.callref, self.ip, self.port)
class mncc_bridge_msg(mncc.gsm_mncc_bridge, mncc_msg_common):
def __str__(self):
return 'mncc_bridge_msg(%u, %u)' % (self.callref[0], self.callref[1])
def __unicode__(self):
return u'mncc_bridge_msg(%u, %u)' % (self.callref[0], self.callref[1])
def mncc_number(number, num_type = 0, num_plan = 0, num_present = 1, num_screen = 0):
return mncc.gsm_mncc_number(number = number, type = num_type,
plan = num_plan, present = num_present,
screen = num_screen)
def mncc_bearer_cap(codecs_permitted):
speech_ver = ctypes.c_int * 8
speech_types = speech_ver()
index = 0
for codec in codecs_permitted:
speech_types[index] = codec
index = index + 1
speech_types[index] = -1
return mncc.gsm_mncc_bearer_cap(coding = 0, speech_ctm=0, radio = 1, speech_ver = speech_types, transfer = 0, mode = 0)
class MnccSocketBase(object):
def send(self, msg):
return self.sock.sendall(msg.send())
def send_msg(self, msg):
data = buffer(msg)[:]
return self.sock.sendall(data)
def recv(self):
data = self.sock.recv(1500)
ms = mncc_msg()
ms.receive(data)
if ms.is_rtp():
ms = mncc_rtp_msg()
ms.receive(data)
elif ms.msg_type == mncc.MNCC_SOCKET_HELLO:
ms = mncc_hello_msg()
ms.receive(data)
return ms
class MnccSocket(MnccSocketBase):
def __init__(self, address = '/tmp/bsc_mncc'):
super(MnccSocketBase, self).__init__()
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET)
print('connecting to %s' % address)
try:
self.sock.connect(address)
except socket.error as errmsg:
sys.stderr.write("%s\n" % errmsg)
sys.exit(1)
# Check the HELLO message
self.check_hello()
def check_hello(self):
print('Waiting for HELLO message...')
msg = self.recv()
# Match expected message type
if msg.msg_type != mncc.MNCC_SOCKET_HELLO:
sys.stderr.write('Received an unknown (!= MNCC_SOCKET_HELLO) '
'message: %s\n' % msg)
sys.exit(1)
# Match expected protocol version
if msg.version != mncc.MNCC_SOCK_VERSION:
sys.stderr.write('MNCC protocol version mismatch '
'(0x%04x vs 0x%04x)\n' % (msg.version, mncc.MNCC_SOCK_VERSION))
sys.exit(1)
# Match expected message sizes / offsets
if (msg.mncc_size != ctypes.sizeof(mncc.gsm_mncc) or
msg.data_frame_size != ctypes.sizeof(mncc.gsm_data_frame) or
msg.called_offset != mncc.gsm_mncc.called.offset or
msg.signal_offset != mncc.gsm_mncc.signal.offset or
msg.emergency_offset != mncc.gsm_mncc.emergency.offset or
msg.lchan_type_offset != mncc.gsm_mncc.lchan_type.offset):
sys.stderr.write('MNCC message alignment mismatch\n')
sys.exit(1)
print('Received %s' % msg)
class MnccSocketServer(object):
def __init__(self, address = '/tmp/bsc_mncc'):
os.unlink(address)
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET)
self.sock.bind(address)
self.sock.listen(5)
def accept(self):
(fd,_) = self.sock.accept()
sock = MnccSocketBase()
sock.sock = fd
return sock
|
