Server woes

["jeetu.golani@xxxxxxxxx" <jeetu.golani@xxxxxxxxx>]

Hi guys,

As a few of you would remember I've been trying to build a libssh
based server. The primary features I've been interested in the server
are SSH authentication and X forwarding along with multithreaded
support.

I've had mixed success with the implementation in the past as I have
reported here. After a long break (was off to CCC and had other things
I needed to clear up) I tried the new libssh master with my server
code. I reimplemented my server code for it to work with a single
session so as to try to minimize chances that multi-threading was
somehow causing things to bungle up.

My X forwaded application fails after some usage. The failure shows up
with the application seemingly unable to refresh its window. I've
collected log information from libssh with verbosity set to
SSH_LOG_PACKET and put it up on pastebin -
http://pastebin.com/XpNWggGv

The interesting segment seems to be:

...
[2011/10/13 17:26:00.712651, 2]   Channel receiving 32 bytes data in 0
(local win=1159472 remote win=2078764)
[2011/10/13 17:26:00.712687, 1]   placing 32 bytes into channel buffer
(stderr=0)
[2011/10/13 17:26:00.712722, 2]   Channel windows are now (local
win=1159440 remote win=2078764)
[2011/10/13 17:26:00.725785, 1] ssh_packet_socket_callback  Error:
read_packet(): Packet len too high(2488547759 945439af)
[2011/10/13 17:26:00.725890, 1] ssh_packet_socket_callback  Error: HMAC error
[2011/10/13 17:26:00.744160, 3]   Enabling POLLOUT for socket
[2011/10/13 17:26:00.744218, 3]   packet: wrote
[len=380,padding=6,comp=373,payload=373]
[2011/10/13 17:26:00.744233, 1]   channel_write wrote 364 bytes
[2011/10/13 17:26:17.172236, 1]   Socket exception callback: 1 (0)
[2011/10/13 17:26:17.172334, 1] ssh_socket_exception_callback  Error:
Socket error: Success

This read_packet with a packet len that is too high with an HMAC error
seems to be consistent with results I had earlier.

I am at a complete loss as to whether this and similar errors I've
seen are as a result of my code or a bug in libssh. If someone could
offer me thoughts as to which elements in my code could possibly be
causing this I could look into these elements and try and narrow
things down a little.

I would sincerely appreciate some help in trying to resolve this.

Thanks,
Jeetu