| #!/usr/bin/python |
| import csv |
| import os |
| import string |
| import struct |
| import subprocess |
| import sys |
| |
| TCPDUMP_MAGIC = 0xa1b2c3d4 |
| TCPDUMP_VERSION = (2, 4) |
| LINKTYPE_IEEE802_11_RADIOTAP = 127 |
| |
| RADIOTAP_FIELDS = [ |
| ('mac_usecs', 'Q'), |
| ('flags', 'B'), |
| ('rate', 'B'), |
| ('channel', 'HH'), |
| ('fhss', 'BB'), |
| ('dbm_antsignal', 'b'), |
| ('dbm_antnoise', 'b'), |
| ('lock_quality', 'H'), |
| ('tx_attenuation', 'H'), |
| ('db_tx_attenuation', 'B'), |
| ('dbm_tx_power', 'b'), |
| ('antenna', 'B'), |
| ('db_antsignal', 'B'), |
| ('db_antnoise', 'B'), |
| ('rx_flags', 'H'), |
| ('tx_flags', 'H'), |
| ('rts_retries', 'B'), |
| ('data_retries', 'B'), |
| ('channelplus', 'II'), |
| ('ht', 'BBB'), |
| ('ampdu_status', 'IHBB'), |
| ('vht', 'HBB4sBBH'), |
| ] |
| |
| _STDFRAME = ('ra', 'ta', 'xa', 'seq') |
| DOT11_TYPES = { |
| # Management |
| 0x00: ('AssocReq', _STDFRAME), |
| 0x01: ('AssocResp', _STDFRAME), |
| 0x02: ('ReassocReq', _STDFRAME), |
| 0x03: ('ReassocResp', _STDFRAME), |
| 0x04: ('ProbeReq', _STDFRAME), |
| 0x05: ('ProbeResp', _STDFRAME), |
| 0x08: ('Beacon', _STDFRAME), |
| 0x09: ('ATIM', _STDFRAME), |
| 0x0a: ('Disassoc', _STDFRAME), |
| 0x0b: ('Auth', _STDFRAME), |
| 0x0c: ('Deauth', _STDFRAME), |
| 0x0d: ('Action', _STDFRAME), |
| |
| # Control |
| 0x16: ('CtlExt', ('ra',)), |
| 0x18: ('BlockAckReq', ('ra', 'ta')), |
| 0x19: ('BlockAck', ('ra', 'ta')), |
| 0x1a: ('PsPoll', ('aid', 'ra', 'ta')), |
| 0x1b: ('RTS', ('ra', 'ta')), |
| 0x1c: ('CTS', ('ra',)), |
| 0x1d: ('ACK', ('ra',)), |
| 0x1e: ('CongestionFreeEnd', ('ra', 'ta')), |
| 0x1f: ('CongestionFreeEndAck', ('ra', 'ta')), |
| |
| # Data |
| 0x20: ('Data', _STDFRAME), |
| 0x21: ('DataCongestionFreeAck', _STDFRAME), |
| 0x22: ('DataCongestionFreePoll', _STDFRAME), |
| 0x23: ('DataCongestionFreeAckPoll', _STDFRAME), |
| 0x24: ('Null', _STDFRAME), |
| 0x25: ('CongestionFreeAck', _STDFRAME), |
| 0x26: ('CongestionFreePoll', _STDFRAME), |
| 0x27: ('CongestionFreeAckPoll', _STDFRAME), |
| 0x28: ('QosData', _STDFRAME), |
| 0x29: ('QosDataCongestionFreeAck', _STDFRAME), |
| 0x2a: ('QosDataCongestionFreePoll', _STDFRAME), |
| 0x2b: ('QosDataCongestionFreeAckPoll', _STDFRAME), |
| 0x2c: ('QosNull', _STDFRAME), |
| 0x2d: ('QosCongestionFreeAck', _STDFRAME), |
| 0x2e: ('QosCongestionFreePoll', _STDFRAME), |
| 0x2f: ('QosCongestionFreeAckPoll', _STDFRAME), |
| } |
| |
| |
| def Align(i, alignment): |
| return i + (alignment - 1) & ~(alignment - 1) |
| |
| |
| def MacAddr(s): |
| return ':'.join(('%02x' % i) for i in struct.unpack('6B', s)) |
| |
| |
| def HexDump(s): |
| out = '' |
| for row in xrange(0, len(s), 16): |
| out += '%04x ' % row |
| for col in xrange(16): |
| if len(s) > row + col: |
| out += '%02x ' % ord(s[row + col]) |
| else: |
| out += ' ' |
| if col == 7: |
| out += ' ' |
| out += ' ' |
| for col in xrange(16): |
| if len(s) > row + col: |
| c = s[row + col] |
| if len(repr(c)) != 3: # x -> 'x' and newline -> '\\n' |
| c = '.' |
| out += c |
| else: |
| out += ' ' |
| if col == 7: |
| out += ' ' |
| out += '\n' |
| return out |
| |
| |
| def Packetize(stream): |
| # pcap global header |
| magicbytes = stream.read(4) |
| if struct.unpack('<I', magicbytes) == (TCPDUMP_MAGIC,): |
| byteorder = '<' |
| elif struct.unpack('>I', magicbytes) == (TCPDUMP_MAGIC,): |
| byteorder = '>' |
| else: |
| raise ValueError('unexpected tcpdump magic %r' % magicbytes) |
| (version_major, version_minor, |
| unused_thiszone, |
| unused_sigfigs, |
| snaplen, |
| network) = struct.unpack(byteorder + 'HHiIII', stream.read(20)) |
| version = (version_major, version_minor) |
| if version != TCPDUMP_VERSION: |
| raise ValueError('unexpected tcpdump version %r' % version) |
| if network != LINKTYPE_IEEE802_11_RADIOTAP: |
| raise ValueError('unexpected tcpdump network type %r' % network) |
| |
| while 1: |
| opt = {} |
| |
| # pcap packet header |
| bytes = stream.read(16) |
| if len(bytes) < 16: break # EOF |
| (ts_sec, ts_usec, |
| incl_len, orig_len) = struct.unpack(byteorder + 'IIII', bytes) |
| if incl_len > orig_len: |
| raise ValueError('packet incl_len(%d) > orig_len(%d): invalid' |
| % (incl_len, orig_len)) |
| if incl_len > snaplen: |
| raise ValueError('packet incl_len(%d) > snaplen(%d): invalid' |
| % (incl_len, snaplen)) |
| |
| opt['pcap_secs'] = ts_sec + (ts_usec / 1e6) |
| |
| # pcap packet data |
| radiotap = stream.read(incl_len) |
| |
| # radiotap header (always little-endian) |
| (it_version, unused_it_pad, |
| it_len, it_present) = struct.unpack('<BBHI', radiotap[:8]) |
| if it_version != 0: |
| raise ValueError('unknown radiotap version %d' % it_version) |
| frame = radiotap[it_len:] |
| optbytes = radiotap[8:it_len] |
| |
| ofs = 0 |
| for i, (name, format) in enumerate(RADIOTAP_FIELDS): |
| if it_present & (1 << i): |
| ofs = Align(ofs, struct.calcsize(format[0])) |
| sz = struct.calcsize(format) |
| v = struct.unpack(format, optbytes[ofs:ofs+sz]) |
| if name == 'mac_usecs': |
| opt['mac_usecs'] = v[0] |
| opt['mac_secs'] = v[0] / 1e6 |
| elif name == 'channel': |
| opt['freq'] = v[0] |
| opt['channel_flags'] = v[1] |
| elif name == 'ht': |
| opt['ht'] = v |
| opt['mcs'] = v[2] |
| else: |
| opt[name] = v if len(v) > 1 else v[0] |
| ofs += sz |
| |
| (fctl, duration) = struct.unpack('<HH', frame[0:4]) |
| dot11ver = fctl & 0x0003 |
| dot11type = (fctl & 0x000c) >> 2 |
| dot11subtype = (fctl & 0x00f0) >> 4 |
| dot11dsmode = (fctl & 0x0300) >> 8 |
| dot11morefrag = (fctl & 0x0400) >> 10 |
| dot11retry = (fctl & 0x0800) >> 11 |
| dot11powerman = (fctl & 0x1000) >> 12 |
| dot11moredata = (fctl & 0x2000) >> 13 |
| dot11wep = (fctl & 0x4000) >> 14 |
| dot11order = (fctl & 0x8000) >> 15 |
| fulltype = (dot11type << 4) | dot11subtype |
| opt['type'] = fulltype |
| (typename, typefields) = DOT11_TYPES.get(fulltype, ('Unknown', ('ra',))) |
| opt['typestr'] = '%02X %s' % (fulltype, typename) |
| opt['dsmode'] = dot11dsmode |
| opt['retry'] = dot11retry |
| opt['powerman'] = dot11powerman |
| opt['order'] = dot11order |
| |
| ofs = 4 |
| for i, fieldname in enumerate(typefields): |
| if fieldname == 'seq': |
| seq = struct.unpack('<H', frame[ofs:ofs+2])[0] |
| opt['seq'] = (seq & 0xfff0) >> 4 |
| opt['frag'] = (seq & 0x000f) |
| ofs += 2 |
| else: |
| opt[fieldname] = MacAddr(frame[ofs:ofs+6]) |
| ofs += 6 |
| |
| yield opt, frame |
| |
| |
| def main(): |
| if 0: |
| for opt, frame in Packetize(sys.stdin): |
| print opt |
| print HexDump(frame) |
| else: |
| want_fields = [ |
| 'ta', |
| 'ra', |
| # 'xa', |
| # 'freq', |
| 'seq', |
| 'mcs', |
| 'rate', |
| 'retry', |
| 'dbm_antsignal', |
| 'dbm_antnoise', |
| # 'frag', |
| 'typestr', |
| # 'powerman', |
| # 'order', |
| # 'dsmode', |
| ] |
| co = csv.writer(sys.stdout) |
| co.writerow(['pcap_secs'] + want_fields) |
| sys.stdout.flush() |
| tbase_pcap = 0 |
| tbase_mac = 0 |
| for opt, frame in Packetize(sys.stdin): |
| t_pcap = opt.get('pcap_secs', 0) |
| if not tbase_pcap: tbase_pcap = t_pcap |
| co.writerow(['%.6f' % (t_pcap - tbase_pcap)] + |
| [opt.get(f, None) for f in want_fields]) |
| sys.stdout.flush() |
| |
| if __name__ == '__main__': |
| main() |
