[Ovmsdev] scp is implemented

[Mark Webb-Johnson]

Very cool:

$ ssh mark at 10.10.41.217 'module tasks'
Number of Tasks = 15       Stack:  Now   Max Total    Heap
Task 3FFB4FA4  1 eventTask         448  2560  4096   54100
Task 3FFCC87C  2 CanRxTask         424   424  2048       0
Task 3FFD06B8  3 ipc0              388   436  1024    9240
Task 3FFD0CB0  4 ipc1              396   444  1024      32
Task 3FFD28C8  7 IDLE              356   468  1024      32
Task 3FFD2E58  8 IDLE              356   468  1024      32
Task 3FFD40F0  9 Tmr Svc           348  2220  4096       0
Task 3FFDC0FC 13 Housekeeping      328  1960  4096   46944
Task 3FFDF3D4 15 tiT               496  1232  2560    5576
Task 3FFE3B9C 16 SIMCOMTask        464   464  4096       0
Task 3FFE8B38 17 AsyncConsole      548  2468  5120   18708
Task 3FFEAA04 18 wifi              432  2048  4096    6000
Task 3FFEDB44 19 pmT               416  1408  2560       0
Task 3FFEEC68 20 rtT               404   596  3584       0
Task 3FFF1258 21 NetManTask       2644  5540  7168   12760

$ scp -q mark at 10.10.41.217:/store/obd2ecu/4 /dev/tty
20;

But no candy:

$ sshfs -d mark at 10.10.41.217:/store ~/Volumes/OVMS
FUSE library version: 2.9.7
nullpath_ok: 0
nopath: 0
utime_omit_ok: 0
Connection to 10.10.41.217 closed by remote host.
remote host has disconnected

OVMS >
E (1655031) ssh: Error in reception: -17

Regards, Mark.

> On 10 Dec 2017, at 10:27 AM, Stephen Casner <casner at acm.org> wrote:
> 
> I have extended the SSH server in console_ssh to support SSH session
> type "exec" in addition to the original "shell" session type.  This
> allows the client ssh command to be followed by a command to the
> executed on OVMS:
> 
> auge1221> ssh ovms vfs ls /store
> ovms_config
> scripts
> events
> testdir
> auge1222>
> 
> It also allows use of the client's scp command to transfer files to or
> from OVMS.  The clients scp command starts an ssh session and passes
> along an scp command to be executed on the server's end.  On a
> Unix-like system the server would execute the scp command as a
> separate process, but on OVMS I have implemented the scp protocol
> within console_ssh.
> 
> So, for example, I can use scp to fetch my startup script so I can
> edit it to remove the extra command I added to set the logging level
> for ssh while I was debugging and then write back the updated script:
> 
> auge1224> scp -r ovms:/store/events .
> startmeup                                100%   72     0.1KB/s   00:00
> auge1225> scp events/system.start/startmeup ovms:/store/events/system.start/
> startmeup                                100%   56     0.1KB/s   00:00
> auge1226>
> 
> In these examples you see that I am using public key authentication so
> I don't have to enter a password.  Secure and very convenient!
> 
> The SSH implementation is a bit slow doing the public key calculations
> so there is a pause of a few seconds as each command begins, but then
> the files are transmitted expediously.  I have not attempted yet to do
> tuning of build options for wolfssh for speed and memory usage.  I
> have also not figured out yet how to perform the rekeying procedure
> with this wolfssh library.  Because the rekeying is not implemented
> properly some data may be lost when it occurs.  However, rekeying will
> be triggered after about 1GB of data transfer, so it seems unlikely
> that we will hit that trigger right away.
> 
> For those who have been wondering when this would be completed, sorry
> for the delay.  The scp protocol is somewhat crude and there is no
> document to specify it which meant I had to do experiments to figure
> out the right actions at each step.  Finally I found the OpenSSH
> implementation on github so I could RTSL.  After that testing all the
> corner cases took a while.  I'm sure you all will let me know if you
> find problems!
> 
>                                                        -- Steve
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.teslaclub.hk
> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev

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