Python: преобразовать TCPDUMP в Text2pcap читаемый формат ⇐ Python

[Anonymous]

Я написал сценарий Python для преобразования текстового вывода TCPDUMP -i eth0 -nexxs0 в формат, понятный с помощью Text2pcap . Это моя первая программа Python , и я ищу предложения для повышения его эффективности, читаемости или любых потенциальных расхождений в коде.20:11:32.001190 00:16:76:7f:2b:b1 > 00:11:5c:78:ca:c0, ethertype IPv4 (0x0800), length 72: 123.236.188.140.41756 > 94.59.34.210.45931: UDP, length 30

0x0000: 0011 5c78 cac0 0016 767f 2bb1 0800 4500 ..\x....v.+...E.
0x0010: 003a 0000 4000 4011 812d 7bec bc8c 5e3b .:..@[email protected]{...^;
0x0020: 22d2 a31c b36b 0026 b9bd 2033 6890 ad33 "....k.&...3h..3
0x0030: e845 4b8d 2ba1 0685 0cb3 70dd 9b98 76d8 .EK.+.....p...v.
0x0040: 8fc6 8293 bf33 325a .....32Z

output
Формат, понятный с помощью Text2pcap :
20:11:32.001190

0000: 00 11 5c 78 ca c0 00 16 76 7f 2b b1 08 00 45 00 ..\x....v.+...E.
0010: 00 3a 00 00 40 00 40 11 81 2d 7b ec bc 8c 5e 3b .:..@[email protected]{...^;
0020: 22 d2 a3 1c b3 6b 00 26 b9 bd 20 33 68 90 ad 33 "....k.&...3h..3
0030: e8 45 4b 8d 2b a1 06 85 0c b3 70 dd 9b 98 76 d8 .EK.+.....p...v.
0040: 8f c6 82 93 bf 33 32 5a .....32Z

Следующий мой код:
import re

# Identify time of the current packet.
time = re.compile('(..:..:..\.[\w]*) ')
# Get individual elements from the packet. ie. offset, hexdump, chars
all = re.compile('[ |\t]+0x([\w]+:) +(.+) +(.*)')
# Regex for two spaces
twoSpaces = re.compile(' +')
# Regex for single space
singleSpace = re.compile(' ')
# Single byte pattern.
singleBytePattern = re.compile(r'([\w][\w])')

# Open files.
f = open('pcap.txt', 'r')
outfile = open('ashu.txt', 'w')

for line in f:
result = time.match(line)
if result:
# If current line contains time format dump only time
print(result.group())
outfile.write(result.group() + '\n')
else:
print(line)
# Split line containing hex dump and tokenize into list elements.
result = all.split(line)
if result:
i = 0
for values in result:
if i == 2:
# Strip off additional spaces in hex dump
# Useful when hex dump does not end in 16 bytes boundary.
val = twoSpaces.sub('', values)

# Tokenize individual elements separated by single space.
byteResult = singleSpace.split(val)
for twoByte in byteResult:
# Identify individual byte
singleByte = singleBytePattern.split(twoByte)
byteOffset = 0
for oneByte in singleByte:
if byteOffset == 1 or byteOffset == 3:
# Write out individual byte with a space char appended
print(oneByte, end=' ')
outfile.write(oneByte + ' ')
byteOffset += 1
elif i == 3:
# Write of char format of hex dump
print(" " + values, end='')
outfile.write(' ' + values + ' ')
elif i == 4:
outfile.write(values)
else:
print(values, end=' ')
outfile.write(values + ' ')
i += 1
else:
print("could not split")
f.close()
outfile.close()


Подробнее здесь: https://stackoverflow.com/questions/390 ... ble-format