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Diameter.py
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Diameter.py
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import socket
import struct
import xml.etree.ElementTree as ET
# code as key, info value
avp_info_dict = {}
# name as key, code as value
avp_dict = {}
# name as key, code value
diameter_cmd_dict = {}
# code as key, name value
avp_dict_info = {}
def init_dict(dict_file):
tree = ET.parse(dict_file)
root = tree.getroot()
for chd in root:
name = chd.text.strip()
if name not in avp_dict_info:
avp_dict_info[name] = chd.attrib
def gen_reply(recv_pack, desc):
flags = None
if 'flags' in desc:
flags = "%02X" % int(desc['flags'])
else:
flags = "%02X" % 0
code = "%06X" % int(desc['code'])
app_id = recv_pack[8:12].encode('hex')
hop_by_hop_id = recv_pack[12:16].encode('hex')
end_to_end_id = recv_pack[16:20].encode('hex')
if 'app_id' in desc:
app_id = "%08X" % int(desc['app_id'])
if 'hop_by_hop_id' in desc:
hop_by_hop_id = "%08X" % int(desc['hop_by_hop_id'])
if 'end_to_end_id' in desc:
end_to_end_id = "%08X" % int(desc['end_to_end_id'])
avp_info = desc['avps']
avp_list = []
recv_code = struct.unpack("!I", recv_pack[:4])[0]
# CCR
if recv_code == 272:
recv_info = get_info(recv_pack, [263, 416, 415])
avp_list.append(recv_info['263'])
avp_list.append(recv_info['416'])
avp_list.append(recv_info['415'])
for info in avp_info:
dict_info = avp_dict_info[info['name']]
avp_list.append(encode_avp_new(dict_info, info))
body = ''.join(avp_list)
length = len(body) + 20
header = "01" + "%06X" % length + flags + code + app_id + hop_by_hop_id + end_to_end_id
header = header.decode('hex')
return header + body
def encode_avp_new(dict_info, info):
avp_code = "%08X" % int(dict_info['code'])
avp_flags = int(info['flags'])
vendor_id = ''
if 'vendor_id' in info:
avp_flags |= 0x80
vendor_id = "%08X" % int(info['vendor_id'])
elif 'vendor_id' in dict_info:
avp_flags |= 0x80
vendor_id = "%08X" % int(dict_info['vendor_id'])
flags = "%02X" % avp_flags
data = ''
total_len = 0
if isinstance(info['value'], list):
for sub_info in info['value']:
sub_dict_info = avp_dict_info[sub_info['name']]
data += encode_avp_new(sub_dict_info, sub_info)
total_len = len(data)
else:
data = encode_avp_value(dict_info, info['value'])
total_len = len(data)
if len(data) % 4 != 0:
data += '\00' * (4 - (len(data) % 4))
total_len += 8 + len(vendor_id) / 2
header = avp_code + flags + "%06X" % total_len + vendor_id
header = header.decode('hex')
return header + data
def parse(data):
if len(data) < 40:
return None, None, None
length = struct.unpack("!I","\00" + data[1:4])[0]
if len(data) < length:
return None, None, None
cmd_code = struct.unpack("!I","\00" + data[5:8])[0]
msg = data[:length]
return cmd_code, length, msg
def get_info(data, avp_cond):
ret = {}
avp = []
avp_data = data[20:]
while len(avp_data) != 0:
slen = "\00" + avp_data[5:8]
mlen = struct.unpack("!I", slen)[0]
plen = (mlen + 3) & ~3
code = struct.unpack("!I", avp_data[:4])[0]
if code in avp_cond:
avp_cond.remove(code)
ret[str(code)] = avp_data[:plen]
if not avp_cond:
break
avp_data = avp_data[plen:]
return ret
def set_length(data):
len_str = "%06X" % len(data)
return data[:1] + len_str.decode('hex') + data[4:]
def encode_avp_value(avp_info, avp_value):
avp_type = avp_info['type']
ret = ''
if avp_type == 'UTF8String' \
or avp_type == 'OctetString' \
or avp_type == 'DiameterURI' \
or avp_type == 'DiameterIdentity':
fs = "!" + str(len(avp_value)) + "s"
ret = struct.pack(fs, str(avp_value))
elif avp_type == 'Unsigned32' \
or avp_type == 'Integer32' \
or avp_type == 'Enumerated':
ret = struct.pack("!I", int(avp_value))
elif avp_type == 'Time':
seconds_between_1900_and_1970 = ((70*365)+17)*86400
ret = struct.pack("!I", long(avp_value) + seconds_between_1900_and_1970)
elif avp_type == 'Unsigned64' \
or avp_type == 'Integer64':
ret = struct.pack("!Q", long(avp_value))
elif avp_type == 'Address':
if avp_value.find('.') != -1:
raw = socket.inet_pton(socket.AF_INET, avp_value);
ret = struct.pack('!h4s', 1, raw)
elif avp_value.find(':') != -1:
raw = socket.inet_pton(socket.AF_INET6, avp_value);
ret = struct.pack('!h16s', 2, raw)
else:
ret = avp_value
return ret
def encode_avp(avp_info):
total = ''
if isinstance(avp_info, list):
for item in avp_info:
total += encode_avp(item)
return total
flags = 0
vendor_id = ''
avp_data = ''
total_len = 0
avp_code = avp_dict[avp_info['name']]
if 'vendor' in avp_info and avp_info['vendor']:
flags |= 0x80
vendor_id = "%08X" % int(avp_info['vendor'])
if 'vendor_id' in avp_info_dict[avp_code][avp_info['name']]:
flags |= 0x80
vendor_id = "%08X" % int(avp_info_dict[avp_code][avp_info['name']]['vendor_id'])
vendor_id = vendor_id.decode('hex')
#if 'mandatory' in avp_info and avp_info['mandatory']:
flags |= 0x40
if 'protected' in avp_info and avp_info['protected']:
flags |= 0x20
if isinstance(avp_info['value'], basestring):
data = encode_avp_value(avp_info_dict[str(avp_code)][avp_info['name']], avp_info['value'])
total_len = len(data)
if len(data) % 4 != 0:
data += '\00' * (4 - (len(data) % 4))
else:
data = encode_avp(avp_info['value'])
total_len = len(data)
total_len += 8
if vendor_id:
total_len += 4
total = "%08X" % int(avp_code) + "%02X" % flags + "%06X" % total_len
total = total.decode('hex')
if vendor_id:
total += vendor_id
total += data
return total
def generate_pack(pack_info):
flags = 0
if 'Request' in pack_info and pack_info['Request']:
flags |= 0x80
if 'Proxiable' in pack_info and pack_info['Proxiable']:
flags |= 0x40
if 'Error' in pack_info and pack_info['Error']:
flags |= 0x20
if 'Re-transmitted' in pack_info and pack_info['Re-transmitted']:
flags |= 0x10
header = "01" + "%06X" % 0 + "%02X" % flags + "%06X" % int(pack_info['code'])
avp_list = []
for avp in pack_info['avps']:
avp_list.append(encode_avp(avp))
return header.decode('hex'), ''.join(avp_list)
def decode_avp_value(avp_pack):
avp_code = struct.unpack("!I", avp_pack[:4])[0]
flag_and_len = struct.unpack("!I", avp_pack[4:8])[0]
flag = flag_and_len >> 24
data = avp_pack[8:]
vendor_id = None
avp_type = ''
if flag & 0x80:
data = avp_pack[12:]
vendor_id = struct.unpack("!I", avp_pack[4:12])[0]
for key, value in avp_info_dict[str(avp_code)].items():
if 'vendor_id' in value \
and vendor_id is not None \
and value['vendor_id'] == str(vendor_id):
avp_type = avp_info_dict[str(avp_code)][key]['type']
break
elif vendor_id is None:
avp_type = avp_info_dict[str(avp_code)][key]['type']
break
ret = ''
if avp_type == 'Unsigned32' \
or avp_type == 'Integer32' \
or avp_type == 'Enumerated':
ret = struct.unpack("!I", data)[0]
else:
ret = data
return ret