I want to fuzz a TCP clinet with Peach Fuzzer.
I found some examples for fuzzing TCP server.
But I can't any example for fuzzing TCP client.
Who can show me some examples for fuzzing TCP client or get me some ideas?
Related
I have an application that sends simple data over TCP (simple, no auth) and another application that must receive it. The only allowed connection between the two is UDP.
On the receiving side, I have SOCAT listening for incoming UDP packets and forwarding them via a TCP connection to the computer that hosts the software.
socat UDP4-LISTEN:5000, fork TCP-CONNECT:192.168.1.5:5001
On the sending side, I can send test data via
socat UDP4-connect 192.168.1.1:5000
There is a firewall in the way and I have no control over it which is why UDP is my only option. The firewall allows UDP out from the sender and UDP in to the receiver.
What I don't know is how to take a TCP connection on the sender and forward its output via UDP. And I don't know if this is the best way or if it will work at all.
Thank you
I'm having some trouble understanding some key concept of the computer networking.
A UDP server usually only needs one socket, whereas a basic TCP server
needs two sockets. Why is that?
If a TCP server were to support n simultaneous
connections, each from a di erent client host, how many sockets would the
TCP server need?
If you can help me understand it I will be more than happy!
Thanks in advance.
hello i’ll try to explain this in a simple manner
TCP is a connection oriented protocol, while UDP is not.
what’s the difference?
In TCP it client and server must be connected first before sending and receiving msgs.
In UDP it can send and receive msgs without securing connection between client and server.
In terms of sockets (basic Tx and Rx)
UDP:
Client - 1 socket for Rx and Tx
Server - 1 socket for Rx and Tx
TCP
Client - 1 socket for Rx and Tx
Socket - 1 socket (main socket) and possibly n sockets
n - depends on how many clients will connect to the server
I have a simple program which uses sockets, listens on specific port (1883) and receives data from client's socket.
I compare received data with Wireshark - it works well.
There are a lot of other TCP packets around MQTT packet in Wireshark.
There is an example:
1) mosquitto_pub -t test -m test
2) In Wireshark, it looks like:
TCP packet
TCP packet
MQTT packet
TCP packet
TCP packet
3) But my program first receives MQTT packet and I'm asking; why doesn't it receive the first two TCP packets as well?
I don't mind that, I wanna receive only MQTT packet, but it seems weird to me and I'd like to know a reason.
I also have a filter in Wireshark, tcp.port on 1883.
Hi guys I'm currently developing a C project in which we basically need to connect N clients to a server through a proxy. I'm doing the first connecting using the TCP protocol. After this, the client may request a file download using UDP. Do I need to have another socket listening to another port and connect the client again to this port or is this an incorrect way of thinking?
TCP and UDP communicate in very different ways. You'll need a separate socket for each
one.
You'll probably want to use the TCP socket to communicate the UDP port to use.
I developed a TCP backend using boost asio and now I need to access the whole TCP packet (header + body). It is possible using TCP sockets?