On Sep 25, 2007, at 1:24 PM, tonyspoken_at_libero.it wrote:
> Hi all,
>
> i'm facing two kind of problems that possibly are connected
> together in some way. These are basically related to a SFTP
> download using non blocking sockets (the file was about 2 Mega).
> What i noticed is that:
>
> 1) If i use a window size of 32768 at a certain point the
> libssh2_sftp_read returns a EAGAIN value forever. The select
> doesn't return any negative or zero values, meaning probably that
> the library is not reading anymore from the socket ... This problem
> presents itself in a quite random fashion, so sometimes the file is
> downloaded sometimes not.
>
> 2) Lowering the download windows size, library seems to work
> correctly. But i tried to do an experiment: while download was in
> progress i put the openSSH server offline (unpluggin the cable) the
> result was that the library libssh2_sftp_read returned a EAGAIN
> value forever, and the select didn't fail at all.
>
> I'm currently working as a client on a SUN Solaris 9 and as servers
> i tried on a linux machine and a HP-UX machine, both shipping
> openSSH servers.
>
> Please could you comment on those?
> I'm sending also my source code which follows very nearly the
> implementation of the example sftp_RW_nonblock
I have no if your problem is related to an issue I have found, but
have not been able to do more then a quick hack in libssh2_packet_add
(). The problem I was seeing is that for some specific data with a
specific server it was sending more uncompressed data then requested,
but less then the requested size compressed. I disabled this code at
packet.c:678 :
if (session->packAdd_channel->remote.packet_size <
(datalen - session->packAdd_data_head)) {
/*
* Spec says we MAY ignore bytes sent beyond
* packet_size
*/
libssh2_error(session,
LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED,
"Packet contains more data than we
offered to receive, truncating",
0);
datalen =
session->packAdd_channel->remote.packet_size +
session->packAdd_data_head;
}
And things worked. I will post more and better information as soon
as I can.
Jim
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Received on 2007-09-26