Re: Re: ssh_fxp_name

Neelabh zaq21wsx at
Tue Nov 3 22:25:13 EST 2009

ok basically my FXP_READDIR loop consumed the entire channel window and the partial sftp packet was probably the last channel data server could send. Fixed that by introducing WINDOW_ADJUST message logic. Thanks for your inputs on this.

On Fri, 30 Oct 2009 05:38:29 +0530  wrote
>On Fri, 29 Oct 2009, qqq wrote:

> Hello,


> I have a very basic sftp client which is able to successfully

> intialize the transport layer, password authenticate, and start the

> sftp subsystem. Now, I am stuck with an issue when I try to retrieve

> the directory listing. Sometimes I get a transport packet in which the

> sftp packet length field registers a length greater than the enclosing

> transport packet. In othet words sometimes I get a transport packet

> whose lenght is less than what the sftp packet length field registers.

> This happens only sometimes. That is, if I give SSH_FXP_READDIR

> commands say 30 times on the same directory, then I get this packet

> after around 25-30 iterations. I tried to check the readability of the

> socket when this happens but the server does not send anything after

> this and select just hangs. I am not able to think of why this is

> happening and would apprecaite pointers in the right direction. thanks

sftp operates at a protocol layer above the SSH transport, so the size of

sftp's packets may exceed the maximum allowed by the ssh connection. In

these cases, a sftp packet may span multiple transport packets.



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