Hello, There appears to be a problem doing SFTP reads with the latest code in CVS. I used the samples "example/simple/sftp_nonblock.c" and "example/ simple/sftp.c"for these results. Trying to read buffers larger than a kilobyte (1393 bytes seems to be the cutoff - memory smasher?) causes MAC validation to fail. I double checked to make sure my buffers were big enough, so this seems to be a bug in libssh2. Here's the relevant log:
... libssh2_sftp_open() is done, now receive data! [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] SFTP Subsystem: Reading 8192 bytes from SFTP handle [libssh2] Connection: Setting blocking mode on channel 0/0 to 1 [libssh2] Connection: Writing 29 bytes on channel 0/0, stream #0 [libssh2] Connection: Sending 29 bytes on channel 0/0, stream_id=0 [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] SFTP Subsystem: Waiting for packet: willnot block [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] Connection: Attempting to read 4 bytes from channel 0/0 stream #0 [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] Failure Event: -30 - Timeout waiting for FXP packet [libssh2] SFTP Subsystem: Asking for 103 packet [libssh2] SFTP Subsystem: Asking for 101 packet [libssh2] SFTP Subsystem: Waiting for packet: will block [libssh2] Connection: Setting blocking mode on channel 0/0 to 1 [libssh2] Connection: Attempting to read 4 bytes from channel 0/0 stream #0 [libssh2] Connection: Setting blocking mode on channel 0/0 to 0 [libssh2] Connection: Setting blocking mode on channel 0/0 to 1 [libssh2] Transport: Packet type 94 received, length=8214 [libssh2] Failure Event: -4 - Invalid Message Authentication Code received The subsystem then discards the packet and I get an error thrown back. It is impossible to get a decent of transfer speed using 512 - 1000 byte reads like the example. It looks like every read incurs a command write and status read on the wire before the user's read, so there is a ton of overhead from doing small reads. Any ideas? ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ libssh2-devel mailing list libssh2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libssh2-devel
