[webshell] Command line access from web browser

af123

af123

Administrator
Staff member
Here's a new package that gives you command line access to your Humax from a web browser as an alternative to using telnet. Once installed, it's accessed via the Diagnostics menu using the icon that will appear at the bottom right. It even works in maintenance mode (although there is no menu bar at the top then) and I've successfully used it to run a disk check.

I've had this running on my box for 6 months or so without problems but one of the people testing it on their box has reported that it does strange things in Safari with old versions of IOS (fine with IOS 9 though). Thanks to Black Hole for testing this over the past few months and prompting me to finish it!

Restart required following installation.

upload_2016-2-8_12-48-16.png
 
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Very nice... but I need a major edit of my standard references now! This will make it much easier for network novices to access the command line.
 
I tried installing it from the WebIf and up popped a box that said "Internal server error".
Installed OK from the command line.
(Your image is broken as well in post #1)
 
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af123 said:
It even works in maintenance mode (although there is no menu bar at the top then) and I've successfully used it to run a disk check.
Click to expand...
How? All I can get is a minimal page saying the system is in maintenance mode.

Is there a chicken and egg situation here? To run in maintenance mode, presumably the support system has to be in Flash. Fair enough. If the idea is to make it easy for novices to run disk repair, they will need to be instructed to install CF and then webshell, but assuming the disk has gone read-only this will require the command line to achieve in the first place - so the novice will have to be instructed on obtaining the command line via Telnet anyway.

Maybe there's not much rewriting for me to do after all.

Regardless, for other purposes it's a lot more convenient than breaking out a Telnet session.

(Using iOS7 on an iPad 3, in the early development there were no line feeds in the terminal emulator. The release version won't do lower case input - everything comes out upper case, so it is impossible to type "cli"! I have since updated to iOS9 - which was pretty painless for a change - and it works fine.)
 
Aha! I think af123 has tried to re-use an image upload from a conversation I am party to - which is why I can see it but nobody else (except him of course).

He needs to upload the image to the topic post separately!

PS: as I was a beta tester, I loaded webshell by command line.
 
Black Hole said:
Is there a chicken and egg situation here? To run in maintenance mode, presumably the support system has to be in Flash. Fair enough. If the idea is to make it easy for novices to run disk repair, they will need to be instructed to install CF and then webshell, but assuming the disk has gone read-only this will require the command line to achieve in the first place - so the novice will have to be instructed on obtaining the command line via Telnet anyway.
Click to expand...
Yes there is. For someone installing the CFW in order to repair their disk they will have to use telnet as they will be unable to install the webshell package or any of the things on which it depends. It does install to flash but I'm reluctant to embed it in the firmware update file itself.
 
prpr said:
My prompt comes out as:
\[\033[01;32m\]\h\[\033[01;34m\] \w \# \[\033[00m\]
Click to expand...
It definitely supports colour and emulates a VT100 terminal. I'm surprised those colour codes don't work as colour in general does (vim syntax highlighting, ls --colour for example).
It also doesn't respect the expert Telnet setting and forces you through the tmenu stuff.
Click to expand...
I don't intend to use that setting for this - I imagine that expert users aren't likely to use it in preference to real telnet/ssh anyway.
 
af123 said:
Yes there is. For someone installing the CFW in order to repair their disk they will have to use telnet as they will be unable to install the webshell package or any of the things on which it depends. It does install to flash but I'm reluctant to embed it in the firmware update file itself.
Click to expand...
Fine. So how did you manage to run it in maintenance mode?
 
Black Hole said:
Fine. So how did you manage to run it in maintenance mode?
Click to expand...
As long as it is installed before you go into maintenance mode the web shell will work.. not with the current test version of CFW 3.10 though as the built-in page supersedes it.
 
af123 said:
It definitely supports colour and emulates a VT100 terminal. I'm surprised those colour codes don't work as colour in general does (vim syntax highlighting, ls --colour for example).
Click to expand...
I added a third clause to the test in the script in /mod/etc/profile/ so it now reads:
Code: 
if [ "$0" = '-sh' -o "$0" = '-/bin/sh' -o "$0" = '/bin/sh' ]; then
Is there a more elegant way to do this?

And can the colour be user tweaked to white on black instead of the other way round?
I don't intend to use that setting for this - I imagine that expert users aren't likely to use it in preference to real telnet/ssh anyway.
Click to expand...
Whatever, but can you strike the 'stupid' message then which tells you otherwise:
Code: 
...
srma - Set return-to-manufacturer (RMA) mode.                                                                        
diag - Run a diagnostic.                                                                                              
  cli - System command line (advanced users).                                                                          
                                                                                                                      
Please select option: cli                                                                                              
                                                                                                                      
-----------------------------------------------------------------------                                                
Now starting a system command prompt. You can make this the default by                                                
enabling 'Expert mode telnet server' on the web interface settings page.                                              
-----------------------------------------------------------------------                                                
                                                                                                                      
Humax HDR-Fox T2 (humax) 1.03.12/3.03                                                                                
                                                                                                                      
To return to the menu, type: exit                                                                                      
                                                                                                                      
humax ~ #
 
prpr said:
I added a third clause to the test in the script in /mod/etc/profile/ so it now reads:
Code: 
if [ "$0" = '-sh' -o "$0" = '-/bin/sh' -o "$0" = '/bin/sh' ]; then
Is there a more elegant way to do this?
Click to expand...
Ah, I remember this now, you have a custom profile script to launch the /mod version of the shell with more capabilities.

I suppose this would be more elegant:

Code: 
if [ "`echo $0 | cut -d/ -f4`" = busybox ]; then
        export HOME=/mod
        export PS1="\[\033[01;32m\]\h\[\033[01;34m\] \w \# \[\033[00m\]"
else
        [ -x /mod/bin/busybox/sh ] && exec /mod/bin/busybox/sh -l
fi
 
prpr said:
And can the colour be user tweaked to white on black instead of the other way round?
Click to expand...

Yes, drop this into /mod/webif/plugin/webshell/vt100.css

Code: 
#vt100 #scrollable { background-color: black; }
#vt100 .ansiDef { color: white; }
#vt100 .bgAnsiDef { background-color: black; }
#vt100 #scrollable.inverted .ansiDef { color: black; }
#vt100 #scrollable.inverted .bgAnsiDef { background-color: white; }

and change the startup script (/mod/etc/init.d/S85webshell) to include the --css option (which will be there by default in the next version along with an example style sheet that won't be overwritten on updates)

Code: 
case "$1" in
        start)
                /mod/boot/2/webshell/shellinaboxd -t \
                    --css=/mod/webif/plugin/webshell/vt100.css \
                    --unixdomain-only=/tmp/.shellbox.sock:root:root:755 \
                    -s /cli/menu:root:root:/:/bin/tmenu &
 
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