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sshdump does not connect and provides no error

asked 2019-03-21 23:50:20 +0000

Ross Jacobs gravatar image

My goal is to use sshdump to stream a packet capture from a remote linux host and save it to my computer locally. I cannot save it on the remote server and then transfer it due to space constraints.

Background

This works on both Macos and Windows (WSL), outputting tshark-formatted packets:

ssh [email protected]<server> "sudo /usr/sbin/tcpdump -s0 -i eth0 -n -U -w - not port 22" | tshark -r -

I would like to use sshdump because it is a Wireshark builtin. Compare the commands I am using below to the recommended command on the man page: sshdump --extcap-interface=sshdump --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10 --remote-username user --remote-filter "not port 22" This is my debug info (containing similar commands):

Macos

** (process:85808): DEBUG: cmdline: /Users/rj/code/wireshark/cmake/run/Wireshark.app/Contents/MacOS/extcap/sshdump --extcap-interface=sshdump --remote-host <my server> --remote-port 22 --remote-username rj --sshkey <path to sshkey> --sshkey-passphrase <my passphrase> --fifo /tmp/ssh.pcap --remote-sudo yes --remote-filter not port 22 --debug 

** (process:85810): DEBUG: You should not come here... maybe some parameter missing?

Windows

** (sshdump.exe:368): DEBUG: cmdline: C:\Program Files\Wireshark\sshdump.exe --extcap-interface=sshdump --remote-host <my server> --remote-port 22 --remote-username rj --sshkey <path to sshkey> --sshkey-passphrase <my passphrase> --fifo C:\Users\rj\AppData\Local/ssh.pcap --remote-sudo yes --remote-filter not port 22 --debug 

** (sshdump.exe:368): DEBUG: You should not come here... maybe some parameter missing?

Questions

  1. Is there anything obvious that I am doing wrong?
  2. How should I troubleshoot this?
  3. Is sshdump recommended or should I just use ssh and tcpdump (whose combination work on both machines)?
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answered 2019-03-22 01:19:51 +0000

Guy Harris gravatar image

Is there anything obvious that I am doing wrong?

No

How should I troubleshoot this?

Submit it as a bug on the Wireshark Bugzilla - this is just a bug; even if the command line arguments aren't valid, there should be a real error message, not some "this can't happen" report.

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Comments

Cheers Guy. I'll do that.

Ross Jacobs gravatar imageRoss Jacobs ( 2019-03-22 13:36:01 +0000 )edit

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Asked: 2019-03-21 23:50:20 +0000

Seen: 407 times

Last updated: Mar 22