I am capturing the router interface from my Fritzbox modem then using Wireshark to view it.
I'd like a script to filter a number of Source IP's and then sum all the Length's (data quantity) associated with them. Effectively giving me the total data usage of each IP address I monitor.
Conceptually is sounds simple, but after a look at Lua, I think I'm in over my head.
Thanks.
Maybe tshark can help you achieve your goal directly, without the need for a script at all? Have you tried something like:
tshark -r file.pcap -z endpoints,ip,"ip.src eq 1.1.1.1" -q
... where 1.1.1.1 represents the IP address of the endpoint you're interested in gathering statistics for? You can specify as many endpoints as you need to by or ing them together, or even use a subnet such as "ip.src eq 1.1.1.0/24", for example.
Related
I am using wireshark to decode gsm packets. Wireshark picks up all communication at that frequency and decodes it.
Overview of the packets obtained.
Now in the system information 5 packet, we have the required parameter.Details of system information 5 packet
I wish to write a code such that if there is only a single value in the last entry of the packet i.e. the neighbour list, an alert inform of a pop up message or something is generated.
These packets have to captured and processed in real time.
I have installed pyshark but cant figure out how to move forward.
Please help
I can only give a partial answer, which is how to detect if there's only a single value or not. My suggestion is to use tshark and then post-process the data using another tool, such as wc. For example:
tshark -i lo -Y "gsm_a.rr.arfcn_list" -T fields -e gsm_a.rr.arfcn_list | wc -w
If the result is 1, then there's only 1 entry in the list.
How you generate an alert from this, I'm not sure.
I'm writing a Wireshark dissector in Lua. Is there a way to get the network interface the current frame was received on/transmitted from within the dissector?
There is a frame field called frame.interface_id, available since Wireshark 1.8.0 according to the Wireshark Display Filter Reference page, which should give you the ID of the interface. The ID seems to match the enumeration given in the results of dumpcap -D (or tshark -D) if you subtract 1 from the enumeration. In other words, both dumpcap and tshark count interfaces starting with 1 in the respective -D outputs, while Wireshark seems to start counting from 0. This inconsistency seems like a bug to me and I would suggest filing a Wireshark bug report against this inconsistent behavior.
EDIT (since it seems impossible to format this in a coherent way using comments):
To access the field, you would use a field extractor, see: https://www.wireshark.org/docs/wsdg_html_chunked/lua_module_Field.html
For example:
local fe_interface_id = Field.new("frame.interface_id")
function foo.dissector(buffer, pinfo, tree)
local f_interface_id = fe_interface_id()
pinfo.cols.info:append(", Interface ID=" .. tostring(f_interface_id))
end
I want to have a list of source IP addresses of an interface outbound traffic. How could I find the direction of a packet whether it's inbound or outbound reading traffic using libpcap? I don't know the subnet information of either side. And there are clients/servers on both sides, so I can't rely on port number ranges to filter traffic.
Why there is no information in libpcap packet header about direction, or filter option like inbound in pcap-filter?
Netsniff-NG, while not relying on libpcap, supports Linux kernel packet type extensions.
They're documented
here
One of the packet types is outgoing and commented as "outgoing of any type".
The following example will capture all packets leaving your interface.
$ netsniff-ng --in eth0 --out outgoing.pcap --type outgoing
Using this you can utilize other command-line tools to read the PCAP file and pull out all the source
addresses. Maybe something *nix-ey like this:
$ tcpdump -nnr outgoing.pcap | cut -d " " -f3 | cut -d . -f1-4
Note: I haven't tried this on a router.
you could use "ether src" or "ether dst" to filter packet direction. This require you to know the mac address of the interface.
You can select a direction that packets will be capture calling pcap_setdirection() before pcap_loop().
For example, to capture incoming packets only you need to write:
handle = pcap_open_live("eth0", 65535, 1, 0, errbuf);
pcap_setdirection(handle, PCAP_D_IN);
pcap_loop(handle, -1, process_packet, NULL);
Possible directions are: PCAP_D_IN, PCAP_D_OUT, PCAP_D_INOUT.
See tcpdump.org/manpages/pcap_setdirection.3pcap.txt
The PCAP file format does not contain a field that holds the interface used during the capture. With that said, the newer PCAP-NG file format, currently used by Wireshark & Tshark, supports it along with packet direction.
Existing pcap-ng features:
packet dropped count
annotations (comments)
local IP address
interface & direction
hostname <-> IP address database
PcapNg
It sounds like you're capturing from a router or firewall so something like the following
would not work.
ip src 192.168.1.1
Capturing the traffic into flows may be an option but it still will not provide you with direction information. Though, you will be able to determine the source and destinations address easily. If you have an existing pcap you can convert it to the ARGUS format:
argus -r capture.pcap -w capture.argus
ra -nnr capture.argus
Other tools, some w/ examples, that can easily obtain end-points/hosts are:
ntop -f capture.pcap
tcpprof -nr capture.pcap
Wireshark Endpoints
flow-tools
You'll have to parse out the information you want, but I don't think that's too much trouble. I recommend taking a look at PCAP-NG if you can't work with this.
I tried dst==192.168.1.101 but only get :
Neither "dst" nor "192.168.1.101" are field or protocol names.
The following display filter isn't a valid display filter:
dst==192.168.1.101
Match destination: ip.dst == x.x.x.x
Match source: ip.src == x.x.x.x
Match either: ip.addr == x.x.x.x
Filtering IP Address in Wireshark:
(1)single IP filtering:
ip.addr==X.X.X.X
ip.src==X.X.X.X
ip.dst==X.X.X.X
(2)Multiple IP filtering based on logical conditions:
OR condition:
(ip.src==192.168.2.25)||(ip.dst==192.168.2.25)
AND condition:
(ip.src==192.168.2.25) && (ip.dst==74.125.236.16)
You can also limit the filter to only part of the ip address.
E.G. To filter 123.*.*.* you can use ip.addr == 123.0.0.0/8. Similar effects can be achieved with /16 and /24.
See WireShark man pages (filters) and look for Classless InterDomain Routing (CIDR) notation.
... the number after the slash represents the number of bits used to represent the network.
If you only care about that particular machine's traffic, use a capture filter instead, which you can set under Capture -> Options.
host 192.168.1.101
Wireshark will only capture packet sent to or received by 192.168.1.101. This has the benefit of requiring less processing, which lowers the chances of important packets being dropped (missed).
Try
ip.dst == 172.16.3.255
Actually for some reason wireshark uses two different kind of filter syntax one on display filter and other on capture filter. Display filter is only useful to find certain traffic just for display purpose only. its like you are interested in all trafic but for now you just want to see specific.
but if you are interested only in certian traffic and does not care about other at all then you use the capture filter.
The Syntax for display filter is (as mentioned earlier)
ip.addr = x.x.x.x
or
ip.src = x.x.x.x
or
ip.dst = x.x.x.x
but above syntax won't work in capture filters, following are the filters
host x.x.x.x
see more example on wireshark wiki page
in our use we have to capture with host x.x.x.x. or (vlan and host x.x.x.x)
anything less will not capture? I am not sure why but that is the way it works!
Other answers already cover how to filter by an address, but if you would like to exclude an address use
ip.addr < 192.168.0.11
Is there a way to capture only the data layer and disregard the upper layers in wireshark? If not, is there a different packet dump utility that can do this? PREFERABLY 1 file per packet!
What I am looking for: A utility that dumps only the data (the payload) layer to a file.
This is programming related...! What I really want to do is to compare all of the datagrams in order to start to understand a third party encoding/protocol. Ideally, and what would be great, would be a hex compare utility that compares multiple files!
You should try right-clicking on a packet and select "Follow TCP Stream". Then you can save the TCP communication into a raw file for further processing. This way you won't get all the TCP/IP protocoll junk.
There is a function to limit capture size in Wireshark, but it seems that 68bytes is the smallest value. There are options to starting new files after a certain number of kilo, mega, gigabytes, but again the smallest is 1-kilobyte, so probably not useful.
I would suggest looking at the pcap library and rolling your own. I've done this in the past using the PERL Net::Pcap library, but it could easily be done it other languages too.
If you have Unix/Linux available you might also look into tcpdump. You can limit amount of data captured with -s. For example "-s 14" would typically get you the Ethernet header, which I assume is what you mean by the datalink layer. There are also options for controlling how often files are created by specifying file size with -C. So theoretically if you set the file size to the capture size, you'll get one file per packet.
Using tshark I was able to print data only, by decoding as telnet and printing field telnet.data
tshark -r file.pcap -d tcp.port==80,telnet -T fields -e telnet.data
GET /test.js HTTP/1.1\x0d\x0a,User-Agent: curl/7.35.0\x0d\x0a,Host: 127.0.0.1\x0d\x0a,Accept: */*\x0d\x0a,\x0d\x0a
HTTP/1.1 404 Not Found\x0d\x0a,Server: nginx/1.4.6 (Ubuntu)\x0d\x0a,Date: Fri, 15 Jan 2016 11:32:58 GMT\x0d\x0a,Content-Type: text/html\x0d\x0a,Content-Length: 177\x0d\x0a,Connection: keep-alive\x0d\x0a,\x0d\x0a,<html>\x0d\x0a,<head><title>404 Not Found</title></head>\x0d\x0a,<body bgcolor=\"white\">\x0d\x0a,<center><h1>404 Not Found</h1></center>\x0d\x0a,<hr><center>nginx/1.4.6 (Ubuntu)</center>\x0d\x0a,</body>\x0d\x0a,</html>\x0d\x0a
Not perfect but it was good enough for what I needed, I hope it helps some one.