I am trying to extract NetFlow Records from a .pcap file, however the data comes up in a non-readable format, like on the attached picture below.
I am unsure how to convert this into a readable format.
I essentially want to get the payload information from the packet capture.
I have tried using Python's scapy library, but I can still not convert it to human readable text.
Related
Essentially I have this .blf file which has a bunch of CAN frames in hex.
In CAN, one frame has a bunch of message fields.
I'd like to grab the Data field.
For example: 1a01 2122 25f4 a187 ea80 2891 a223 4542
Is a CAN frame. Somewhere in that frame is the Data message that I can convert into Decimal.
How do I go about recognizes which Hex codes contain the message?
Thanks in advnace
BLF format not only contains the data of the CAN frame, but also other information like the id of the application which created the BLF file, timestamps, arbitration id, etc.
Additionally the data could also be compressed.
As you have python in the tags, I'd suggest you take a look at python-can
This library has support for reading and writing BLF files.
I am using pyshark to open and parse pcap files. Currently I've been able to access the packet fields. But I cannot seem to find a way to access the hexdump value of each packet. Is there any way to do that?
According to the homepage of PyShark:
[PyShark] doesn't actually parse any packets, it simply uses tshark's (wireshark command-line utility) ability to export XMLs to use its parsing.
The XML exported by tshark is either PSML (Packet Summary Markup Language) or PDML (Packet Details Markup Language) and neither of these format store the full hexadecimal dump of packets.
After digging into the source code and considering the point above, I can say that the feature you are looking for is not implemented in PyShark.
What is the easiest way to get a stream of the microphone levels using python?
I'm using USB mics and Python 3.3
edit: I have used pyaudio to record a wav file and I can also write the chunks from the stream into a text file, but I have no clue what the chunks mean. Is there a way to interpret them to get things like decibel or frequency?
This is what the raw data looks like when printed to a file:
"b'\xb0\xff\xb0\xff\xa7\xff\xa8\xff\xa7\xff\xa7\xff\xaa\xff\xa9\xff..."
I am converting a Python 2 program to Python 3 and I'm not sure about the approach to take.
The program reads in either a single email from STDIN, or file(s) are specified containing emails. The program then parses the emails and does some processing on them.
SO we need to work with the raw data of the email input, to store it on disk and do an MD5 hash on it. We also need to work with the text of the email input in order to run it through the Python email parser and extract fields etc.
With Python 3 it is unclear to me how we should be reading in the data. I believe we need the raw binary data in order to do an md5 on it, and also to be able to write it to disk. I understand we also need it in text form to be able to parse it with the email library. Python 3 has made significant changes to the IO handling and text handling and I can't see the "correct" approach to read the email raw data and also use the same data in text form.
Can anyone offer general guidance on this?
The general guidance is convert everything to unicode ASAP and keep it that way until the last possible minute.
Remember that str is the old unicode and bytes is the old str.
See http://docs.python.org/dev/howto/unicode.html for a start.
With Python 3 it is unclear to me how we should be reading in the data.
Specify the encoding when you open the file it and it will automatically give you unicode. If you're reading from stdin, you'll get unicode. You can read from stdin.buffer to get binary data.
I believe we need the raw binary data in order to do an md5 on it
Yes, you do. encode it when you need to hash it.
and also to be able to write it to disk.
You specify the encoding when you open the file you're writing it to, and the file object encodes it for you.
I understand we also need it in text form to be able to parse it with the email library.
Yep, but since it'll get decoded when you open the file, that's what you'll have.
That said, this question is really too open ended for Stack Overflow. When you have a specific problem / question, come back and we'll help.
I'm trying to read a field from an Active Directory entry which contains raw jpeg binary data. I'd like to read that data and convert it to an image file for use in my django-based application. I cannot for the life of me figure out how to handle this data in a nice way. Any ideas?
Edit:
To anyone who might come across this in the future: there's a method in python's OS library:
os.tmpfile()
it creates a file and destroys it once the file descriptor is closed. Very useful for this situation.
Here is somebody who was having the same problem -- check out the latest post at the bottom.
http://groups.google.com/group/django-users/browse_thread/thread/4214db6699863ded/5d816b02daca3186
Looks like passing raw data to SimpleUploadedFile is what you are looking for.
request._raw_post_data
The raw HTTP POST data as a byte
string. This is useful for processing
data in different formats than of
conventional HTML forms: binary
images, XML payload etc.
http://docs.djangoproject.com/en/dev/ref/request-response/#httprequest-objects
I know this isn't part of the question, but this looks pretty awesome! "HttpRequest.read() file-like interface"
http://docs.djangoproject.com/en/dev/ref/request-response/#django.http.HttpRequest.read