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pcap.py
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pcap.py
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#!/usr/bin/python
# coding: utf-8
# Copyright (c) 2013 Mountainstorm
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from amdevice import *
from plistservice import *
from ctypes import *
from datetime import datetime
import socket
class iptap_hdr_t(BigEndianStructure):
_pack_ = 1
_fields_ = [
(u'hdr_length', c_uint32),
(u'version', c_uint8),
(u'length', c_uint32),
(u'type', c_uint8),
(u'unit', c_uint16),
(u'io', c_uint8),
(u'protocol_family', c_uint32),
(u'frame_pre_length', c_uint32),
(u'frame_pst_length', c_uint32),
(u'if_name', c_char * 16)
]
class Pcap(PlistService):
def __init__(self, amdevice):
PlistService.__init__(self, amdevice, [u'com.apple.pcapd'])
def get_packet(self):
return self._recvmsg()
class pcap_hdr_t(Structure):
_pack_ = 1
_fields_ = [
(u'magic_number', c_uint32),
(u'version_major', c_uint16),
(u'version_minor', c_uint16),
(u'thiszone', c_int32),
(u'sigfigs', c_uint32),
(u'snaplen', c_uint32),
(u'network', c_uint32)
]
class pcaprec_hdr_t(Structure):
_pack_ = 1
_fields_ = [
(u'ts_sec', c_uint32),
(u'ts_usec', c_uint32),
(u'incl_len', c_uint32),
(u'orig_len', c_uint32)
]
class PcapFile(object):
PCAP_MAGIC = 0xa1b2c3d4
PCAP_MAJOR_VERSION = 2
PCAP_MINOR_VERSION = 4
def __init__(self, filename):
self._f = open(filename, u'wb')
# write the hdr
self._f.write(pcap_hdr_t(
PcapFile.PCAP_MAGIC,
PcapFile.PCAP_MAJOR_VERSION,
PcapFile.PCAP_MINOR_VERSION,
0,
0,
65535, # XXX update this if we ever get a bigger packet
1 # LINKTYPE_ETHERNET -- data is raw ethernet packets
))
def __del__(self):
self.close()
def close(self):
self._f.close()
def write_packet(self, packetdata):
now = datetime.now()
self._f.write(pcaprec_hdr_t(
now.second,
now.microsecond,
len(packetdata),
len(packetdata)
))
self._f.write(packetdata)
def register_argparse_pcap(cmdargs):
import argparse
def cmd_pcap(args, dev):
pcapd = Pcap(dev)
pcap = PcapFile(args.path.decode(u'utf-8'))
try:
while True:
pkt = pcapd.get_packet()
hdr = iptap_hdr_t.from_buffer_copy(pkt)
# wireshark doesn't have support for this protocol so dump iptap hdr
pcap.write_packet(pkt[sizeof(iptap_hdr_t):])
except:
pass
pcap.close()
pcapd.disconnect()
pcapcmd = cmdargs.add_parser(
u'pcap',
help=u'record packets from device into pcap file'
)
pcapcmd.add_argument(
u'path',
help=u'path of the file to write'
)
pcapcmd.set_defaults(func=cmd_pcap)