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xlog.py
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xlog.py
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#!/usr/bin/python
import sys
import os
import glob
import zlib
import struct
import binascii
import pyelliptic
import traceback
MAGIC_NO_COMPRESS_START = 0x03
MAGIC_NO_COMPRESS_START1 = 0x06
MAGIC_NO_COMPRESS_NO_CRYPT_START = 0x08
MAGIC_COMPRESS_START = 0x04
MAGIC_COMPRESS_START1 = 0x05
MAGIC_COMPRESS_START2 = 0x07
MAGIC_COMPRESS_NO_CRYPT_START = 0x09
MAGIC_END = 0x00
lastseq = 0
# Get environment variables
PRIV_KEY = os.getenv('PRIV_KEY')
PUB_KEY = os.environ.get('PUB_KEY')
def tea_decipher(v, k):
op = 0xffffffffL
v0, v1 = struct.unpack('=LL', v[0:8])
k1, k2, k3, k4 = struct.unpack('=LLLL', k[0:16])
delta = 0x9E3779B9L
s = (delta << 4) & op
for i in xrange(16):
v1 = (v1 - (((v0<<4) + k3) ^ (v0 + s) ^ ((v0>>5) + k4))) & op
v0 = (v0 - (((v1<<4) + k1) ^ (v1 + s) ^ ((v1>>5) + k2))) & op
s = (s - delta) & op
return struct.pack('=LL', v0, v1)
def tea_decrypt(v, k):
num = len(v) / 8 * 8
ret = ''
for i in xrange(0, num, 8):
x = tea_decipher(v[i:i+8], k)
ret += x
ret += v[num:]
return ret
def IsGoodLogBuffer(_buffer, _offset, count):
if _offset == len(_buffer): return (True, '')
magic_start = _buffer[_offset]
if MAGIC_NO_COMPRESS_START==magic_start or MAGIC_COMPRESS_START==magic_start or MAGIC_COMPRESS_START1==magic_start:
crypt_key_len = 4
elif MAGIC_COMPRESS_START2==magic_start or MAGIC_NO_COMPRESS_START1==magic_start or MAGIC_NO_COMPRESS_NO_CRYPT_START==magic_start or MAGIC_COMPRESS_NO_CRYPT_START==magic_start:
crypt_key_len = 64
else:
return (False, '_buffer[%d]:%d != MAGIC_NUM_START'%(_offset, _buffer[_offset]))
headerLen = 1 + 2 + 1 + 1 + 4 + crypt_key_len
if _offset + headerLen + 1 + 1 > len(_buffer): return (False, 'offset:%d > len(buffer):%d'%(_offset, len(_buffer)))
length = struct.unpack_from("I", buffer(_buffer, _offset+headerLen-4-crypt_key_len, 4))[0]
if _offset + headerLen + length + 1 > len(_buffer): return (False, 'log length:%d, end pos %d > len(buffer):%d'%(length, _offset + headerLen + length + 1, len(_buffer)))
if MAGIC_END!=_buffer[_offset + headerLen + length]: return (False, 'log length:%d, buffer[%d]:%d != MAGIC_END'%(length, _offset + headerLen + length, _buffer[_offset + headerLen + length]))
if (1>=count): return (True, '')
else: return IsGoodLogBuffer(_buffer, _offset+headerLen+length+1, count-1)
def GetLogStartPos(_buffer, _count):
offset = 0
while True:
if offset >= len(_buffer): break
if MAGIC_NO_COMPRESS_START==_buffer[offset] or MAGIC_NO_COMPRESS_START1==_buffer[offset] or MAGIC_COMPRESS_START==_buffer[offset] or MAGIC_COMPRESS_START1==_buffer[offset] or MAGIC_COMPRESS_START2==_buffer[offset] or MAGIC_COMPRESS_NO_CRYPT_START==_buffer[offset] or MAGIC_NO_COMPRESS_NO_CRYPT_START==_buffer[offset]:
if IsGoodLogBuffer(_buffer, offset, _count)[0]: return offset
offset+=1
return -1
def DecodeBuffer(_buffer, _offset, _outbuffer):
if _offset >= len(_buffer): return -1
# if _offset + 1 + 4 + 1 + 1 > len(_buffer): return -1
ret = IsGoodLogBuffer(_buffer, _offset, 1)
if not ret[0]:
fixpos = GetLogStartPos(_buffer[_offset:], 1)
if -1==fixpos:
return -1
else:
_outbuffer.extend("[F]decode_log_file.py decode error len=%d, result:%s \n"%(fixpos, ret[1]))
_offset += fixpos
magic_start = _buffer[_offset]
if MAGIC_NO_COMPRESS_START==magic_start or MAGIC_COMPRESS_START==magic_start or MAGIC_COMPRESS_START1==magic_start:
crypt_key_len = 4
elif MAGIC_COMPRESS_START2==magic_start or MAGIC_NO_COMPRESS_START1==magic_start or MAGIC_NO_COMPRESS_NO_CRYPT_START==magic_start or MAGIC_COMPRESS_NO_CRYPT_START==magic_start:
crypt_key_len = 64
else:
_outbuffer.extend('in DecodeBuffer _buffer[%d]:%d != MAGIC_NUM_START'%(_offset, magic_start))
return -1
headerLen = 1 + 2 + 1 + 1 + 4 + crypt_key_len
length = struct.unpack_from("I", buffer(_buffer, _offset+headerLen-4-crypt_key_len, 4))[0]
tmpbuffer = bytearray(length)
seq=struct.unpack_from("H", buffer(_buffer, _offset+headerLen-4-crypt_key_len-2-2, 2))[0]
begin_hour=struct.unpack_from("c", buffer(_buffer, _offset+headerLen-4-crypt_key_len-1-1, 1))[0]
end_hour=struct.unpack_from("c", buffer(_buffer, _offset+headerLen-4-crypt_key_len-1, 1))[0]
global lastseq
if seq != 0 and seq != 1 and lastseq != 0 and seq != (lastseq+1):
_outbuffer.extend("[F]decode_log_file.py log seq:%d-%d is missing\n" %(lastseq+1, seq-1))
if seq != 0:
lastseq = seq
tmpbuffer[:] = _buffer[_offset+headerLen:_offset+headerLen+length]
try:
decompressor = zlib.decompressobj(-zlib.MAX_WBITS)
if MAGIC_NO_COMPRESS_START1==_buffer[_offset]:
pass
elif MAGIC_COMPRESS_START2==_buffer[_offset]:
svr = pyelliptic.ECC(curve='secp256k1')
client = pyelliptic.ECC(curve='secp256k1')
client.pubkey_x = str(buffer(_buffer, _offset+headerLen-crypt_key_len, crypt_key_len/2))
client.pubkey_y = str(buffer(_buffer, _offset+headerLen-crypt_key_len/2, crypt_key_len/2))
svr.privkey = binascii.unhexlify(PRIV_KEY)
tea_key = svr.get_ecdh_key(client.get_pubkey())
tmpbuffer = tea_decrypt(tmpbuffer, tea_key)
tmpbuffer = decompressor.decompress(str(tmpbuffer))
elif MAGIC_COMPRESS_START==_buffer[_offset] or MAGIC_COMPRESS_NO_CRYPT_START==_buffer[_offset]:
tmpbuffer = decompressor.decompress(str(tmpbuffer))
elif MAGIC_COMPRESS_START1==_buffer[_offset]:
decompress_data = bytearray()
while len(tmpbuffer) > 0:
single_log_len = struct.unpack_from("H", buffer(tmpbuffer, 0, 2))[0]
decompress_data.extend(tmpbuffer[2:single_log_len+2])
tmpbuffer[:] = tmpbuffer[single_log_len+2:len(tmpbuffer)]
tmpbuffer = decompressor.decompress(str(decompress_data))
else:
pass
# _outbuffer.extend('seq:%d, hour:%d-%d len:%d decompress:%d\n' %(seq, ord(begin_hour), ord(end_hour), length, len(tmpbuffer)))
except Exception, e:
traceback.print_exc()
_outbuffer.extend("[F]decode_log_file.py decompress err, " + str(e) + "\n")
return _offset+headerLen+length+1
_outbuffer.extend(tmpbuffer)
return _offset+headerLen+length+1
def ParseFile(_file, _outfile):
fp = open(_file, "rb")
_buffer = bytearray(os.path.getsize(_file))
fp.readinto(_buffer)
fp.close()
startpos = GetLogStartPos(_buffer, 2)
if -1==startpos:
return
outbuffer = bytearray()
while True:
startpos = DecodeBuffer(_buffer, startpos, outbuffer)
if -1==startpos: break;
if 0==len(outbuffer): return
fpout = open(_outfile, "wb")
fpout.write(outbuffer)
fpout.close()
def main(args):
global lastseq
if 1==len(args):
if os.path.isdir(args[0]):
filelist = glob.glob(args[0] + "/*.xlog")
for filepath in filelist:
lastseq = 0
ParseFile(filepath, filepath+".log")
else: ParseFile(args[0], args[0]+".log")
elif 2==len(args):
ParseFile(args[0], args[1])
else:
filelist = glob.glob("*.xlog")
for filepath in filelist:
lastseq = 0
ParseFile(filepath, filepath+".log")
if __name__ == "__main__":
main(sys.argv[1:])