Source code for dpkt.h225

# $Id: h225.py 23 2006-11-08 15:45:33Z dugsong $
# -*- coding: utf-8 -*-
"""ITU-T H.225.0 Call Signaling."""
from __future__ import print_function
from __future__ import absolute_import

import struct

from . import dpkt
from . import tpkt


# H225 Call Signaling
#
# Call messages and information elements (IEs) are defined by Q.931:
# http://cvsup.de.openbsd.org/historic/comp/doc/standards/itu/Q/Q.931.ps.gz
#
# The User-to-User IEs of H225 are encoded by PER of ASN.1.

# Call Establishment Messages
ALERTING = 1
CALL_PROCEEDING = 2
CONNECT = 7
CONNECT_ACKNOWLEDGE = 15
PROGRESS = 3
SETUP = 5
SETUP_ACKNOWLEDGE = 13

# Call Information Phase Messages
RESUME = 38
RESUME_ACKNOWLEDGE = 46
RESUME_REJECT = 34
SUSPEND = 37
SUSPEND_ACKNOWLEDGE = 45
SUSPEND_REJECT = 33
USER_INFORMATION = 32

# Call Clearing Messages
DISCONNECT = 69
RELEASE = 77
RELEASE_COMPLETE = 90
RESTART = 70
RESTART_ACKNOWLEDGE = 78

# Miscellaneous Messages
SEGMENT = 96
CONGESTION_CONTROL = 121
INFORMATION = 123
NOTIFY = 110
STATUS = 125
STATUS_ENQUIRY = 117

# Type 1 Single Octet Information Element IDs
RESERVED = 128
SHIFT = 144
CONGESTION_LEVEL = 176
REPEAT_INDICATOR = 208

# Type 2 Single Octet Information Element IDs
MORE_DATA = 160
SENDING_COMPLETE = 161

# Variable Length Information Element IDs
SEGMENTED_MESSAGE = 0
BEARER_CAPABILITY = 4
CAUSE = 8
CALL_IDENTITY = 16
CALL_STATE = 20
CHANNEL_IDENTIFICATION = 24
PROGRESS_INDICATOR = 30
NETWORK_SPECIFIC_FACILITIES = 32
NOTIFICATION_INDICATOR = 39
DISPLAY = 40
DATE_TIME = 41
KEYPAD_FACILITY = 44
SIGNAL = 52
INFORMATION_RATE = 64
END_TO_END_TRANSIT_DELAY = 66
TRANSIT_DELAY_SELECTION_AND_INDICATION = 67
PACKET_LAYER_BINARY_PARAMETERS = 68
PACKET_LAYER_WINDOW_SIZE = 69
PACKET_SIZE = 70
CLOSED_USER_GROUP = 71
REVERSE_CHARGE_INDICATION = 74
CALLING_PARTY_NUMBER = 108
CALLING_PARTY_SUBADDRESS = 109
CALLED_PARTY_NUMBER = 112
CALLED_PARTY_SUBADDRESS = 113
REDIRECTING_NUMBER = 116
TRANSIT_NETWORK_SELECTION = 120
RESTART_INDICATOR = 121
LOW_LAYER_COMPATIBILITY = 124
HIGH_LAYER_COMPATIBILITY = 125
USER_TO_USER = 126
ESCAPE_FOR_EXTENSION = 127


[docs]class H225(dpkt.Packet): """ITU-T H.225.0 Call Signaling. TODO: Longer class information.... Attributes: __hdr__: Header fields of H225. TODO. """ __hdr__ = ( ('proto', 'B', 8), ('ref_len', 'B', 2) )
[docs] def unpack(self, buf): # TPKT header self.tpkt = tpkt.TPKT(buf) if self.tpkt.v != 3: raise dpkt.UnpackError('invalid TPKT version') if self.tpkt.rsvd != 0: raise dpkt.UnpackError('invalid TPKT reserved value') n = self.tpkt.len - self.tpkt.__hdr_len__ if n > len(self.tpkt.data): raise dpkt.UnpackError('invalid TPKT length') buf = self.tpkt.data # Q.931 payload dpkt.Packet.unpack(self, buf) buf = buf[self.__hdr_len__:] self.ref_val = buf[:self.ref_len] buf = buf[self.ref_len:] self.type = struct.unpack('B', buf[:1])[0] buf = buf[1:] # Information Elements l = [] while buf: ie = self.IE(buf) l.append(ie) buf = buf[len(ie):] self.data = l
def __len__(self): return self.tpkt.__hdr_len__ + self.__hdr_len__ + sum(map(len, self.data)) def __bytes__(self): return self.tpkt.pack_hdr() + self.pack_hdr() + self.ref_val + \ struct.pack('B', self.type) + b''.join(map(bytes, self.data))
[docs] class IE(dpkt.Packet): __hdr__ = ( ('type', 'B', 0), )
[docs] def unpack(self, buf): dpkt.Packet.unpack(self, buf) buf = buf[self.__hdr_len__:] # single-byte IE if self.type & 0x80: self.len = 0 self.data = None # multi-byte IE else: # special PER-encoded UUIE if self.type == USER_TO_USER: self.len = struct.unpack('>H', buf[:2])[0] buf = buf[2:] # normal TLV-like IE else: self.len = struct.unpack('B', buf[:1])[0] buf = buf[1:] self.data = buf[:self.len]
def __len__(self): if self.type & 0x80: n = 0 else: if self.type == USER_TO_USER: n = 2 else: n = 1 return self.__hdr_len__ + self.len + n def __bytes__(self): if self.type & 0x80: length_str = None else: if self.type == USER_TO_USER: length_str = struct.pack('>H', self.len) else: length_str = struct.pack('B', self.len) return struct.pack('B', self.type) + length_str + self.data
__s = b'\x03\x00\x04\x11\x08\x02\x54\x2b\x05\x04\x03\x88\x93\xa5\x28\x0e\x4a\x6f\x6e\x20\x4f\x62\x65\x72\x68\x65\x69\x64\x65\x00\x7e\x03\xf0\x05\x20\xb8\x06\x00\x08\x91\x4a\x00\x04\x01\x40\x0c\x00\x4a\x00\x6f\x00\x6e\x00\x20\x00\x4f\x00\x62\x00\x65\x00\x72\x00\x68\x00\x65\x00\x69\x00\x64\x00\x65\x22\xc0\x09\x00\x00\x3d\x06\x65\x6b\x69\x67\x61\x00\x00\x14\x32\x2e\x30\x2e\x32\x20\x28\x4f\x50\x41\x4c\x20\x76\x32\x2e\x32\x2e\x32\x29\x00\x00\x00\x01\x40\x15\x00\x74\x00\x63\x00\x70\x00\x24\x00\x68\x00\x33\x00\x32\x00\x33\x00\x2e\x00\x76\x00\x6f\x00\x78\x00\x67\x00\x72\x00\x61\x00\x74\x00\x69\x00\x61\x00\x2e\x00\x6f\x00\x72\x00\x67\x00\x42\x87\x23\x2c\x06\xb8\x00\x6a\x8b\x1d\x0c\xb7\x06\xdb\x11\x9e\xca\x00\x10\xa4\x89\x6d\x6a\x00\xc5\x1d\x80\x04\x07\x00\x0a\x00\x01\x7a\x75\x30\x11\x00\x5e\x88\x1d\x0c\xb7\x06\xdb\x11\x9e\xca\x00\x10\xa4\x89\x6d\x6a\x82\x2b\x0e\x30\x40\x00\x00\x06\x04\x01\x00\x4c\x10\x09\x00\x00\x3d\x0f\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x57\x69\x64\x65\x36\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x26\x00\x00\x64\x0c\x10\x09\x00\x00\x3d\x0f\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x57\x69\x64\x65\x36\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x2a\x40\x00\x00\x06\x04\x01\x00\x4c\x10\x09\x00\x00\x3d\x09\x69\x4c\x42\x43\x2d\x31\x33\x6b\x33\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x20\x00\x00\x65\x0c\x10\x09\x00\x00\x3d\x09\x69\x4c\x42\x43\x2d\x31\x33\x6b\x33\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x20\x40\x00\x00\x06\x04\x01\x00\x4e\x0c\x03\x00\x83\x00\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x16\x00\x00\x66\x0e\x0c\x03\x00\x83\x00\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x4b\x40\x00\x00\x06\x04\x01\x00\x4c\x10\xb5\x00\x53\x4c\x2a\x02\x00\x00\x00\x00\x00\x40\x01\x00\x00\x40\x01\x02\x00\x08\x00\x00\x00\x00\x00\x31\x00\x01\x00\x40\x1f\x00\x00\x59\x06\x00\x00\x41\x00\x00\x00\x02\x00\x40\x01\x00\x00\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x41\x00\x00\x67\x0c\x10\xb5\x00\x53\x4c\x2a\x02\x00\x00\x00\x00\x00\x40\x01\x00\x00\x40\x01\x02\x00\x08\x00\x00\x00\x00\x00\x31\x00\x01\x00\x40\x1f\x00\x00\x59\x06\x00\x00\x41\x00\x00\x00\x02\x00\x40\x01\x00\x00\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x32\x40\x00\x00\x06\x04\x01\x00\x4c\x10\x09\x00\x00\x3d\x11\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x4e\x61\x72\x72\x6f\x77\x33\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x28\x00\x00\x68\x0c\x10\x09\x00\x00\x3d\x11\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x4e\x61\x72\x72\x6f\x77\x33\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x1d\x40\x00\x00\x06\x04\x01\x00\x4c\x60\x1d\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x13\x00\x00\x69\x0c\x60\x1d\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x1d\x40\x00\x00\x06\x04\x01\x00\x4c\x20\x1d\x80\x11\x1c\x00\x01\x00\x98\xa0\x26\x41\x13\x8a\x00\x98\xa0\x26\x41\x13\x8b\x13\x00\x00\x6a\x0c\x20\x1d\x80\x0b\x0d\x00\x01\x00\x98\xa0\x26\x41\x13\x8b\x00\x01\x00\x01\x00\x01\x00\x01\x00\x81\x03\x02\x80\xf8\x02\x70\x01\x06\x00\x08\x81\x75\x00\x0b\x80\x13\x80\x01\xf4\x00\x01\x00\x00\x01\x00\x00\x01\x00\x00\x0c\xc0\x01\x00\x01\x80\x0b\x80\x00\x00\x20\x20\x09\x00\x00\x3d\x0f\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x57\x69\x64\x65\x36\x80\x00\x01\x20\x20\x09\x00\x00\x3d\x09\x69\x4c\x42\x43\x2d\x31\x33\x6b\x33\x80\x00\x02\x24\x18\x03\x00\xe6\x00\x80\x00\x03\x20\x20\xb5\x00\x53\x4c\x2a\x02\x00\x00\x00\x00\x00\x40\x01\x00\x00\x40\x01\x02\x00\x08\x00\x00\x00\x00\x00\x31\x00\x01\x00\x40\x1f\x00\x00\x59\x06\x00\x00\x41\x00\x00\x00\x02\x00\x40\x01\x00\x00\x80\x00\x04\x20\x20\x09\x00\x00\x3d\x11\x53\x70\x65\x65\x78\x20\x62\x73\x34\x20\x4e\x61\x72\x72\x6f\x77\x33\x80\x00\x05\x20\xc0\xef\x80\x00\x06\x20\x40\xef\x80\x00\x07\x08\xe0\x03\x51\x00\x80\x01\x00\x80\x00\x08\x08\xd0\x03\x51\x00\x80\x01\x00\x80\x00\x09\x83\x01\x50\x80\x00\x0a\x83\x01\x10\x80\x00\x0b\x83\x01\x40\x00\x80\x01\x03\x06\x00\x00\x00\x01\x00\x02\x00\x03\x00\x04\x00\x05\x00\x06\x01\x00\x07\x00\x08\x00\x00\x09\x01\x00\x0a\x00\x0b\x07\x01\x00\x32\x80\xa6\xff\x4c\x02\x80\x01\x80'
[docs]def test_pack(): h = H225(__s) assert (__s == bytes(h))
[docs]def test_unpack(): h = H225(__s) assert (h.tpkt.v == 3) assert (h.tpkt.rsvd == 0) assert (h.tpkt.len == 1041) assert (h.proto == 8) assert (h.type == SETUP) assert (len(h.data) == 3) ie = h.data[0] assert (ie.type == BEARER_CAPABILITY) assert (ie.len == 3) ie = h.data[1] assert (ie.type == DISPLAY) assert (ie.len == 14) ie = h.data[2] assert (ie.type == USER_TO_USER) assert (ie.len == 1008)
if __name__ == '__main__': test_pack() test_unpack() print('Tests Successful...')