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# $Id: diameter.py 23 2006-11-08 15:45:33Z dugsong $
"""Diameter."""
import struct
import dpkt
# Diameter Base Protocol - RFC 3588
# http://tools.ietf.org/html/rfc3588
# Request/Answer Command Codes
ABORT_SESSION = 274
ACCOUTING = 271
CAPABILITIES_EXCHANGE = 257
DEVICE_WATCHDOG = 280
DISCONNECT_PEER = 282
RE_AUTH = 258
SESSION_TERMINATION = 275
class Diameter(dpkt.Packet):
__hdr__ = (
('v', 'B', 1),
('len', '3s', 0),
('flags', 'B', 0),
('cmd', '3s', 0),
('app_id', 'I', 0),
('hop_id', 'I', 0),
('end_id', 'I', 0)
)
def _get_r(self):
return (self.flags >> 7) & 0x1
def _set_r(self, r):
self.flags = (self.flags & ~0x80) | ((r & 0x1) << 7)
request_flag = property(_get_r, _set_r)
def _get_p(self):
return (self.flags >> 6) & 0x1
def _set_p(self, p):
self.flags = (self.flags & ~0x40) | ((p & 0x1) << 6)
proxiable_flag = property(_get_p, _set_p)
def _get_e(self):
return (self.flags >> 5) & 0x1
def _set_e(self, e):
self.flags = (self.flags & ~0x20) | ((e & 0x1) << 5)
error_flag = property(_get_e, _set_e)
def _get_t(self):
return (self.flags >> 4) & 0x1
def _set_t(self, t):
self.flags = (self.flags & ~0x10) | ((t & 0x1) << 4)
retransmit_flag = property(_get_t, _set_t)
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
self.cmd = (ord(self.cmd[0]) << 16) | \
(ord(self.cmd[1]) << 8) | \
ord(self.cmd[2])
self.len = (ord(self.len[0]) << 16) | \
(ord(self.len[1]) << 8) | \
ord(self.len[2])
self.data = self.data[:self.len - self.__hdr_len__]
l = []
while self.data:
avp = AVP(self.data)
l.append(avp)
self.data = self.data[len(avp):]
self.data = self.avps = l
def pack_hdr(self):
self.len = chr((self.len >> 16) & 0xff) + \
chr((self.len >> 8) & 0xff) + \
chr(self.len & 0xff)
self.cmd = chr((self.cmd >> 16) & 0xff) + \
chr((self.cmd >> 8) & 0xff) + \
chr(self.cmd & 0xff)
return dpkt.Packet.pack_hdr(self)
def __len__(self):
return self.__hdr_len__ + \
sum(map(len, self.data))
def __str__(self):
return self.pack_hdr() + \
''.join(map(str, self.data))
class AVP(dpkt.Packet):
__hdr__ = (
('code', 'I', 0),
('flags', 'B', 0),
('len', '3s', 0),
)
def _get_v(self):
return (self.flags >> 7) & 0x1
def _set_v(self, v):
self.flags = (self.flags & ~0x80) | ((v & 0x1) << 7)
vendor_flag = property(_get_v, _set_v)
def _get_m(self):
return (self.flags >> 6) & 0x1
def _set_m(self, m):
self.flags = (self.flags & ~0x40) | ((m & 0x1) << 6)
mandatory_flag = property(_get_m, _set_m)
def _get_p(self):
return (self.flags >> 5) & 0x1
def _set_p(self, p):
self.flags = (self.flags & ~0x20) | ((p & 0x1) << 5)
protected_flag = property(_get_p, _set_p)
def unpack(self, buf):
dpkt.Packet.unpack(self, buf)
self.len = (ord(self.len[0]) << 16) | \
(ord(self.len[1]) << 8) | \
ord(self.len[2])
if self.vendor_flag:
self.vendor = struct.unpack('>I', self.data[:4])[0]
self.data = self.data[4:self.len - self.__hdr_len__]
else:
self.data = self.data[:self.len - self.__hdr_len__]
def pack_hdr(self):
self.len = chr((self.len >> 16) & 0xff) + \
chr((self.len >> 8) & 0xff) + \
chr(self.len & 0xff)
data = dpkt.Packet.pack_hdr(self)
if self.vendor_flag:
data += struct.pack('>I', self.vendor)
return data
def __len__(self):
length = self.__hdr_len__ + \
sum(map(len, self.data))
if self.vendor_flag:
length += 4
return length
if __name__ == '__main__':
import unittest
class DiameterTestCase(unittest.TestCase):
def testPack(self):
d = Diameter(self.s)
self.failUnless(self.s == str(d))
d = Diameter(self.t)
self.failUnless(self.t == str(d))
def testUnpack(self):
d = Diameter(self.s)
self.failUnless(d.len == 40)
#self.failUnless(d.cmd == DEVICE_WATCHDOG_REQUEST)
self.failUnless(d.request_flag == 1)
self.failUnless(d.error_flag == 0)
self.failUnless(len(d.avps) == 2)
avp = d.avps[0]
#self.failUnless(avp.code == ORIGIN_HOST)
self.failUnless(avp.mandatory_flag == 1)
self.failUnless(avp.vendor_flag == 0)
self.failUnless(avp.len == 12)
self.failUnless(len(avp) == 12)
self.failUnless(avp.data == '\x68\x30\x30\x32')
# also test the optional vendor id support
d = Diameter(self.t)
self.failUnless(d.len == 44)
avp = d.avps[0]
self.failUnless(avp.vendor_flag == 1)
self.failUnless(avp.len == 16)
self.failUnless(len(avp) == 16)
self.failUnless(avp.vendor == 3735928559)
self.failUnless(avp.data == '\x68\x30\x30\x32')
s = '\x01\x00\x00\x28\x80\x00\x01\x18\x00\x00\x00\x00\x00\x00\x41\xc8\x00\x00\x00\x0c\x00\x00\x01\x08\x40\x00\x00\x0c\x68\x30\x30\x32\x00\x00\x01\x28\x40\x00\x00\x08'
t = '\x01\x00\x00\x2c\x80\x00\x01\x18\x00\x00\x00\x00\x00\x00\x41\xc8\x00\x00\x00\x0c\x00\x00\x01\x08\xc0\x00\x00\x10\xde\xad\xbe\xef\x68\x30\x30\x32\x00\x00\x01\x28\x40\x00\x00\x08'
unittest.main()
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