On Sat, 8 Mar 2014, Bob Kast wrote:
When doing a read a file that is about 12k, it fails partway through with
LIBSSH2_ERROR_SFTP_PROTOCOL. In looking closer, it is at this point in
sftp.c:
if(rc32 > chunk->len) {
/* A chunk larger than we requested was returned to us.
This is a protocol violation and we don't know how to
deal with it. Bail out! */
return _libssh2_error(session,
LIBSSH2_ERROR_SFTP_PROTOCOL,
"FXP_READ response too big");
}
My code requests a block of 4096. It multiplies that by 4 (16,384), then it
starts doing packets requesting 2000 characters. After it's done 8 of these,
the 'count' goes down to 384, which is what chunk->len is set to above. rc32
is set to 2000 so it fails.
I assume you're trying with the latest libssh2 version?
I've found if I have the requested buffer at exactly a multiple of 2000, it
seems to work, although I'm somewhat nervous about it working for all cases.
Is this expected? It is not documented.
It is not expected. The check above is there to detect the error situation
when a server returns a bigger chunk than what we asked for.
libssh2 splits up data sizes into smaller chunks and ask for them one by one,
so chunk->len is supposed to be the size of the chunk it asked for.
--
/ daniel.haxx.se
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