I run Wireshark to capture packets generated from my simulation. I use File > Export Packet Dissection > As CSV... to extract the captured packets into CSV file in order to do some machine learning. The following is an example of I got:
No.| Time| Source| Destination| Protocol| Length| Info|
1 0.45 127.0.0.1 127.0.0.1 TCP 76 40656 > 6633 [SYN] Seq=0 Win=43690 Len=0 MSS=65495 SACK_PERM=1 TSval=454250 TSecr=0 WS=512
My question is: How do I get the payload itself from the packet?
Extracting the payload can be difficult, depends on link encryption. In case the link is unencrypted It's possible in some cases and CSV is one of them. Please follow this link. Let me know if that worked for you.
Related
I am trying to build an SSL Server under Python 3.4. The point is to communicate and exchange data with a programme through a defined protocol based on JSON data format.
So I used a basic "echo server" and client in SSL Protocol and modified those to see if I could exchange data. It worked and sending "hello" one side comes as b"hello" on the other side and it works both ways.
I start the server side, connect the program, it communicates succesfully, but:
I am expecting something like : LOGIN:n::{“user”:”XXXXX”, , ”password”:”YYYYY ”, app”:”ZZZZZ”, “app_ver”:”zzz”, ”protocol”:”xxx”,”protocol_ver”:”xxxx”} arriving from the client (program)
But instead I am getting something like this b"\x16\x03\x03\x00\x8e\x01\x00\x00\x8a\x03\x03^\x9e\xeb\xd8\x8f\xd9 \x05v\xbbF:}\xda\x17\xf7\x13\xff\xa9\xde=5\xfb_\xbco\x16\x96EL#\x00\x00*\xc0,\xc0+\xc00\xc0/\x00\x9f\x00\x9e\xc0$\xc0#\xc0(\xc0'\xc0\n\xc0\t\xc0\x14\xc0\x13\x00\x9d\x00\x9c\x00=\x00<\x005\x00/\x00\n\x01\x00\x007\x00\n\x00\x08\x00\x06\x00\x1d\x00\x17\x00\x18\x00\x0b\x00\x02\x01\x00\x00\r\x00\x14\x00\x12\x06\x01\x06\x03\x04\x01\x05\x01\x02\x01\x04\x03\x05\x03\x02\x03\x02\x02\x00#\x00\x00\x00\x17\x00\x00\xff\x01\x00\x01\x00"
I thought it was simply encoded, but I have tried the bytemessage.decode()method, with utf-8, cp437, cp1250, cp1252, latin-1, etc. I have also tried codecs.decode() with hex. No success, I Don't understand what language is this.
I am new to SSL so I suppose I am missing something obvious here, but I have no idea what …
Any help would be greatly appreciated.
Thanks in advance !
---- Edit here is the code of my server-----
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = ('localhost', 5000)
print ('starting up on %s port %s' % server_address)
sock.bind(server_address)
sock.listen(1)
while True:
print ( 'waiting for a connection')
connection, client_address = sock.accept();
try:
print( 'connection from', client_address)
while True:
data = connection.recv(16)
print ( 'received "%s"' % data)
if True:
#data2=b'{"timing":{"liveEvents": {"sector": {"dayTime": 1483523892618,"driver": 1,"isValid": false,"participant": "0","sector": 3,"time": -1}}}}'
print ('sending data to the client')
#connection.sendall(data2)
else:
print ( 'no more data from', client_address)
break
finally:
connection.close()
b"\x16\x03\x03...
This is a TLS message. Looks like your client tries to speak TLS to your server but your server cannot properly handle it. Instead of treating the data as TLS it will assume that the TLS is the actual application data.
Looking at your server code the reason is clear: you are not doing any SSL there, i.e. you are doing a plain TCP socket. SSL will not magically appear just because a clients tries to talk SSL with the server but you need to use the ssl module, properly wrap_socket and provide the necessary server certificate and key. For some simple example see the documentation.
As #Steffen mentioned , I wasn't handling SSL at all, which I now do with ssl.wrap_socket(sock,certfile='certificat.pem', keyfile='cle.pem', server_side=True)
Operation on server side requires certificates and key files in pem, which I generated with SelfSSL7 and then split the pfx into 2 pem key and certificate files with OpenSSL
openssl pkcs12 -in yourpfxfile.pfx -nocerts -out privatekey.pem -nodes
openssl pkcs12 -in yourpfxfile.pfx -nokeys -out publiccert.pem -nodes
Maybe not the fastest solution for a self signed certificate since I now have OpenSSL installed but …
Finally, the expected message !!
starting up on localhost port 11000
waiting for a connection
connection from ('127.0.0.1', 60488)
received "b'PING:0::\r\n'"
sending data to the client
received "b'LOGIN:::{"user":"test","password":"test","app":"AppName","app_ver":"1.0.0","protocol":" ","protocol_ver":"1.0.0"}\r\n'"
sending data to the client
Again thank you very much #SteffenUllrich
...
org.apache.camel.component.file.GenericFileOperationFailedException: File operation failed:
125 Storing data set TEST.TRANSFER.FB80.TXT
IOException caught while copying.. Code: 125
at org.apache.camel.component.file.remote.FtpOperations.doStoreFile(FtpOperations.java:710)
...
RFC 959 reads:
125 Data connection already open; transfer starting.
This is more informational rather than exceptional, isn't it?
FTP reply code 125 is just half of the story. Performing the transfer with Windows 7's command line ftp client manually shows:
ftp> send TRANSFER.FB80.TXT
---> PORT 10,100,113,251,254,235
200 Port request OK.
---> STOR TRANSFER.FB80.TXT
125 Storing data set TEST.TRANSFER.FB80.TXT
451-Error: Name=CkResults (Write) RC=-13
451-System completion code and reason: B37-04
451-Data set is out of space.
451-Error (1013) closing the data set.
451 Transfer aborted due to file error.
...
I created the according issue CAMEL-13069: Display proper FTP reply message in case of transfer error.
We are building a desktop app, on Electron, to share media on IPFS. We want to incentivize the people, who either by an IPFS add or pin, make data available to other users and in effect are "seeding" the data. We want to track how much data is being sent and received by each user, programmatically and periodically.
Is there a standard pattern or a service to be able to do this?
TIA!
On the CLI you can use the ipfs stats bw -p <peer id> command to see the total bytes sent and recieved between your node and the peer id you pass in.
$ ipfs stats bw -p QmeMKDA6HbDD8Bwb4WoAQ7s9oKZTBpy55YFKG1RSHnBz6a
Bandwidth
TotalIn: 875 B
TotalOut: 14 kB
RateIn: 0 B/s
RateOut: 0 B/s
See: https://docs.ipfs.io/reference/api/cli/#ipfs-stats-bw
You can use the ipfs.stats.bw method to the data programatically from the js implementation of IPFS js-ipfs or via the js-ipfs-http-client talking to the http api of a locally running ipfs daemon.
ipfs.stats.bw will show all traffic between to peers, which can include dht queries and other traffic that isn't directly related to sharing blocks of data.
If you want info on just blocks of data shared then you can use ipfs bitswap ledger from the command line.
$ ipfs bitswap ledger QmeMKDA6HbDD8Bwb4WoAQ7s9oKZTBpy55YFKG1RSHnBz6a
Ledger for QmeMKDA6HbDD8Bwb4WoAQ7s9oKZTBpy55YFKG1RSHnBz6a
Debt ratio: 0.000000
Exchanges: 0
Bytes sent: 0
Bytes received: 0
See: https://docs.ipfs.io/reference/api/cli/#ipfs-bitswap-ledger
That api is not directly available in js-ipfs or the js-http-api-client yet.
i am working on a project where we need to collect the bitorrent infohash id running in our small ISP network. using port mirroring we can pass the all wan traffic to a server and run tcpdump tools or any other tool to find the infohash id download by bitorrent client. for example
tcpflow -p -c -i eth1 tcp | grep -oE '(GET) .* HTTP/1.[01].*'
this code is showing result like this
GET /announce?info_hash=N%a1%94%17%2c%11%aa%90%9c%0a%1a0%9d%b2%cfy%08A%03%16&peer_id=-BT7950-%f1%a2%d8%8fO%d7%f9%bc%f1%28%15%26&port=19211&uploaded=55918592&downloaded=0&left=0&corrupt=0&key=21594C0B&numwant=200&compact=1&no_peer_id=1 HTTP/1.1
now we need to capture only infohash and store it to a log or mysql database
can you please tell me which tool can do thing like this
Depending on how rigorous you want to be you'll have to decode the following protocol layers:
TCP, assemble packets of a flow. you're already doing that with tcpflow. tshark - wireshark's CLI - could do that too.
HTTP, extract the value of the GET header. A simple regex would do the job here.
URI, extracting the query string
application/x-www-form-urlencoded, info_hash key value pair extraction and handling of percent-encoding
For the last two steps I would look for tools or libraries in your programming language of choice to handle them.
How can i use tcpdump to capture Ethernet frames and display any frame sent or received by the local PC with one of the UDP, ARP, and ICMP protocols.
I was trying this command:
sudo tcpdump -e udp or arp or icmp
but, i thinks it's wrong.
I can give you an example, how you can capture enthernet frame from your localhost.
sudo tcpdump -i lo -nnvvvexxXXKS -s0
for capturing the frame we used "exxXX"
Do use tcpdump -e. Here's an example of the output:
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
22:36:02.408697 02:42:ac:11:00:02 (oui Unknown) > 02:42:ac:11:00:03 (oui Unknown), ethertype IPv4 (0x0800), length 74: client.60546 > yahoo.com.80: Flags [S], seq 1673384407, win 64240, options [mss 1460,sackOK,TS val 2181456358 ecr 0,nop,wscale 7], length 0
In this example, you can see frame fields such as the MAC addresses (e.g. 02:42:ac:11:00:03) and the frame type (e.g. ethertype IPv4 0x0800).
From the manpage:
If the '-e' option is given, the link level header is printed out. On Ethernets, the source and destination addresses, protocol, and packet length are printed.
On FDDI networks, the '-e' option causes tcpdump to print the `frame control' field, the source and destination addresses, and the packet length. (The `frame control' field governs the interpretation of the rest of the packet. Normal packets (such as those containing IP datagrams) are `async' packets, with a priority value between 0 and 7; for example, `async4'. Such packets are assumed to contain an 802.2 Logical Link Control (LLC) packet; the LLC header is printed if it is not an ISO datagram or a so-called SNAP packet.
On Token Ring networks, the '-e' option causes tcpdump to print the `access control' and `frame control' fields, the source and destination addresses, and the packet length. As on FDDI networks, packets are assumed to contain an LLC packet. Regardless of whether the '-e' option is specified or not, the source routing information is printed for source-routed packets.
On 802.11 networks, the '-e' option causes tcpdump to print the `frame control' fields, all of the addresses in the 802.11 header, and the packet length. As on FDDI net‐works, packets are assumed to contain an LLC packet.
First of all, you are interested in packets, not frames. Frames are a layer below packets and only chip manufacturers are concerned with them. Second, you must specify your interface with the -i switch or promiscuous mode won't be even activated for you to see everything - if that's what you want.