LazyWeb: Simple Unix TCP Proxy Debugging
OK LazyWeb. Help.
I need the ability to debug an arbitrary TCP connection. I have a server listening on port X. I want an app that can listen on Y and connect to port X forwarding all input/output between the two. All output would then be logged to a file.
This way I can temporarily tell my client to listen to port Y and then debug the network IO between them.
Ethereal and tcpdump will work but they’re a little bit overkill for this situation.
Netcat can do this but I can’t get it to both listen to a port and log to a non-hex format.
Any ideas?
Note: I used to use a home brewed Java app called plugproxy I wrote (extended actually) a few years ago but seem to have lost the source.
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January 4, 2006 at 4:08 am
Are you on a Mac? Interarchy has a pretty useful mode for this. EtherPeek is the pro tool, but it’s costlier.
January 4, 2006 at 4:21 am
socat is awesome for the job. its netcat on steroids.
January 4, 2006 at 4:23 am
or tcptunnel (but this doesn’t handle concurrent connections too well)
January 5, 2006 at 2:08 pm
I have a program I wrote called stp.c that’s a simple TCP proxy that can log either side of the communication (or both!). Sorry there’s very little documentation but it’s a simple C program so it should be easy to see how to use it (hmmm … looking at the code, you’ll need to specify the debug mode to use the logging, or change the code to suit your needs).