Monitor socket with ngrep or perl for activity, then issue command_问答_开发者

Monitor socket with ngrep or perl for activity, then issue command

开发者 https://www.devze.com 2022-12-25 07:58 出处：网络

I\'d like to use ngrep and/or perl to monitor the incoming data stream on a socket, then, when the appropriate characters arrive, like in this case, the string \"192.168.1.101:8080\", input to the dat

I'd like to use ngrep and/or perl to monitor the incoming data stream on a socket, then, when the appropriate characters arrive, like in this case, the string "192.168.1.101:8080", input to the data stream a redirect to 开发者_StackOverflowanother ipaddress, such as "192.168.1.102"

Is this even possible?

Sure, thats possible.

Algorithm/application would require:

MiM listenning server (creating sockets session sockets)
hand-shake on MiM:
(best thing would be if there would be a text stream not binary protocol used)
recv from client, parse message then:
if IP comes in, open or use already opened socket to the target server/port
send message or rest of the message to target server
provide communication beteween client and target sever (operate as gateway)
recv() client or server and send() back to appropriate side

General advice: operate on select() or epoll(), approach more advanced but better.

This can done easily in Perl.

Take a look at perldoc perlipc, IO::Socket and IO::Select for examples.

You might find Beej's Guide to Network Programming helpful, too. The examples are all in C, but Perl's networking API is pretty close to the C flavor.