Nmap Development mailing list archives
Re: netcat as both client and server and communicating both ways
From: Daniel Miller <bonsaiviking () gmail com>
Date: Wed, 9 Aug 2017 22:24:54 -0500
Pavel, That bug is a different issue that was resolved when we added the --no-shutdown option. That issue is with Ncat in client/connect mode, and Blaise is describing a problem with Ncat in server/listen mode. Dan On Wed, Aug 9, 2017 at 12:46 AM, Pavel Zhukov <pzhukov () redhat com> wrote:
On Wed, Aug 9, 2017 at 12:07 AM, Blaise R. <rex2k8 () gmail com> wrote:I originally asked Fyodor about this via email and he directed me here. I think my first email got lost in spam filter because I sent it before I was on the list. Here is the original email: Hello. I have a problem with the nmap's ncat, the latest one on Fedora 25, I it was 7.40. I also compiled 7.50 from sources but the results are all the same. I realize that I can get echo in many different better ways, this is just a distilled down example of a bigger thing I'm attempting to do. Basically, I use as the server: nc -kl 1234 -c cat and as the client: echo 'w' | nc localhost 1234 It doesn't output the w back to me. I have tried a server with nc that just reads the input and echos back an HTTP header and content and it worked when using a web browser as a client. I have also tried running just: nc localhost 1234 And I'm able to interactively enter lines and get them back. There is also a service called seashells.io, doing: echo 'w' | nc seashells.io 1337 also works and this is the behavior I'd want to achieve. It looks like some sort of issue when there is nmap's ncat on both client and server. I'd appreciate any response (known bug, won't fix, will fix, patches or deeper research welcome, etc.) at all.Hello, There's bug opened in Red Hat bugzilla: https://bugzilla.redhat.com/ show_bug.cgi?id=1064511 It contains link to debian bug and iirc this issue was discussed few times here.Best regards. _______________________________________________ Sent through the dev mailing list https://nmap.org/mailman/listinfo/dev Archived at http://seclists.org/nmap-dev/-- Pavel Zhukov Software Engineer IRC: landgraf _______________________________________________ Sent through the dev mailing list https://nmap.org/mailman/listinfo/dev Archived at http://seclists.org/nmap-dev/
_______________________________________________ Sent through the dev mailing list https://nmap.org/mailman/listinfo/dev Archived at http://seclists.org/nmap-dev/
Current thread:
- netcat as both client and server and communicating both ways Blaise R. (Aug 08)
- Re: netcat as both client and server and communicating both ways Pavel Zhukov (Aug 08)
- Re: netcat as both client and server and communicating both ways Daniel Miller (Aug 09)
- Re: netcat as both client and server and communicating both ways Daniel Miller (Aug 09)
- Re: netcat as both client and server and communicating both ways Pavel Zhukov (Aug 08)