Error: stdin is from a terminal

[0xE2]

TCP scans are failing with Error: stdin is from a terminal exception.

Environment information:

• OS: Kali 2021.2
• Console & shell: XFCE TerminalEmulator + zsh
• sx: pre-built binary release (tested on v0.2 & 0.3)

Some sx snippets I tested with (I renamed sx binary to sxscanner, because Kali already has some tool named sx):

sxscanner tcp fin -p 80 10.10.10.230
sxscanner tcp -p 1-65535 10.10.10.230

Issues might be somewhere here: sx/command/config.go#L288, but I don't know Go, so now sure what can cause the issue.

[v-byte-cpu]

Hi @0xE2 ! sx explicitly reads arp cache from pipe or from file that is described in the TCP scan section of the readme. Error: stdin is from a terminal means that sx tool expects arp cache from stdin pipe (that is demonstrated in most examples) or from file using -a option, but you didn't pass that and as a consequence tty is linked to stdin.

[0xE2]

Oh, I wish I read the docs beforehand :) v-byte-cpu/sx#tcp-scan
Thanks!

However, I have a different issue now, when trying to run sx arp -i tun0 10.10.10.230:
Error: invalid source MAC

Any clues on how can I can possibly fix this? (Note: tun0 is an openvpn connection)

[v-byte-cpu]

vpn network interfaces (openvpn, wireguard etc.) are not supported yet, only physical network interfaces. This is because vpn interfaces require to send IP packets instead of Ethernet frames. I'm still thinking about how to add logic without complicating the code.

[v-byte-cpu]

@0xE2 I added support for scanning with vpn interfaces and already tested it on wireguard and openvpn networks. You can try it in the 0.4.0 release. In your case you should use:

sxscanner tcp -p 1-65535 10.10.10.230 -i tun0