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Forum Discussion
Shell script for displaying RN 214 LCD messages
Hi everyone, I made a small ssh shell script for displaying texts on Readynas 214 (or 204) OS6.0.xx LCD Display (e.g. for messages of an end of a ssh shell programm). Have fun with it! Name it a...
Any reason you say this is for the 214/204 and not generic for all OS6 units with an LCD? It works on a 516 as well.
Where did you find documentation on the commands for rn_lcd? It doesn't seem to have any help available.
Messing around with it a bit, P seems to be a page designator. I though K could be related to how it cycles between pages, and I did have it cycling between two messages, but I've not fully figured it out. If it's a number, it definately has an effect on the duration.
I got that command analyzing /etc on ReadyNas OS ssh shell. So far have you tried all -h or --help commands with that rn_lcd? In any case try to use "od" command for examining /sbin/ /bin/ and so on. As far as the ReadyNas team have no explicit command for accessing the LCD my script is the best solution instead of installing a huge GB development environtment on the NAS and a PC... As I wrote: No one has to use it, it's free and it does no harm: it relies only on the ReadyNas OS content! You can use even a blinking messages with a shell for ... do; done loop (one lcd cmd displays text for 3s the other one no)
Yeah, I tried all possible help options and got nothing. rnutil itself has a main help screen, but nothing for that subcommand I can find. I may move a NAS with a display into the same room as my computer desk so I can experiment more. Examining rnutil with a hex editor shows options and error messages for some sub-commands, but none for rn_lcd. It doesn't even complain if K is a number or string.
FWIW, there are quite a few soft links to rnutil scattered around - including /usr/bin/rn_lcd. These include
antivirus_scan_rootfs apt_wait backup_md bit_rot_event blink bluetooth_event check_ups_drv clamav_event create_bond create_vlans diagnostics disk_chan disk_event_handler dump_sysflags event_push firmware_update get_disk_info hotplug_event md_event mkhomedir_helper remote_access reset_i2c rn_lcd rn_shutdown search_for_key set_mtu shutdown_eda spindown_schedule start_raids update_support_fw_db volume_schedule volume_util
It looks like rnutil will interpret the name of the soft link as a command - and there are a lot more of these commands than show up in the help text.
hello StephenB,
I know you are here master, and we/me appreciate you all but listing all possible commands WHICH ARE DANGEROUSLY FOR THE NAS IS NOT VERY CONSTRUCTIVE. eg like firmware_update, start_raids are not that what surely anyone of Netgear wants, isn't it?
In my case I just wanted to give a little shell tool for infos on the LCD screen (the other ones I already knew, and beside of that I can "!hexray" and ghidra anything on RN...)
But anyway thanks to you for giving some bad peoples an idea to write trojans with firmwar_update
StephenB wrote:FWIW, there are quite a few soft links to rnutil scattered around - including /usr/bin/rn_lcd. These include
k as a command - and there are a lot more of these commands than show up in the help text.
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