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I'm not really sure where to start. I'm supposed to use netcat to allow anyone to access my shell remotely in C. I know I need to need to use sockets, but not sure what else. Can anyone point me in the right direction. Basically when I execute the program, I want it to open "nc -l 1234", take in commands from the client and respond. Thanks.

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2 Answers 2

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you can try 

$nc -l 1234 -e /bin/bash -i  (server)

$nc x.x.x.x 1234  (client)

We have created a netcat server and indicated it to run /bin/bash command when connection is successful.

This is a good reference for it . (using c)

http://www.cs.swarthmore.edu/~aviv/classes/f12/cs43/labs/lab4/lab4.pdf
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3 Comments

I think you need to have '/bin/bash -i' in quotes
My school's server has an earlier version of NC, so I can't use the -e flag.
Thanks for the reference. I'll spend some time with it.
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Try something like 

mkfifo temp
nc -l 1234 < temp 2>&1 | /bin/sh > temp 2>&1
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7 Comments

when I replace sh with ./shell (my executable) it doesn't work. What do I need to change?
Try nc -l 1234 < temp 2>&1 | ./shell > temp 2>&1
so do I need to read from a socket or something in my server shell? is that how that works. or is this just more of a hack and I should go another route?
because I'm getting this error: write error: Bad file descriptor
Huh? Are you sure that your netcat program is error free and that you're correctly creating the named pipe?
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