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Understanding SFTP

 
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Old 09-19-2011
Understanding SFTP
Hi All,
I am new to SFTP, would like to understand a few things about SFTP.
Below are a few questions.

1) I have two servers and accounts in each
Say, user1@server1
user2@server2
I have setup password less sftp connection (rsa keys) from user1@server1 to user2@server2
i.e., i am able to connect to server2 from server1 using "sftp user2@server2"
Now, i have a folder "/u16/mydir/folder2" with "d---------" access rights in server2.
Owner is different from user1 and user2. Say "folderowner"
Step1 : i logged into server2 directly using user2.
when i do "cd /u16/mydir/folder2" .. it worked.
( I assumed that will throw error as there are no read and excute access on that directory).
How was this possible?

Step2 : i logged into server1 and connected to server2 using "sftp user2@server2"
now when i did "cd /u16/mydir/folder2" .. it did not work.

What is the difference? When i tried using direct login into server1 (Step1) it worked , but when i
use same user through sftp it did not.

2) I came across certain posts about below errors
Couldn't canonicalise:
Couldn't get handle:
What are the scenarios these errors occurs. Most of the posts say that its Permission problem,
Is it possible for anyone give me a detailed steps to replicate these errors, so that i can understand the
reasons correctly.

Thanks
Vinod
 
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libssh2_sftp_init

libssh2_sftp_init(3)						  libssh2 manual					      libssh2_sftp_init(3)

NAME

       libssh2_sftp_init - open SFTP channel for the given SSH session.

SYNOPSIS

       #include <libssh2.h> #include <libssh2_sftp.h>

       LIBSSH2_SFTP * libssh2_sftp_init(LIBSSH2_SESSION *session);

DESCRIPTION

       session - Session instance as returned by libssh2_session_init_ex(3)

       Open  a	channel and initialize the SFTP subsystem. Although the SFTP subsystem operates over the same type of channel as those exported by
       the Channel API, the protocol itself implements its own unique binary packet protocol which must be managed with the libssh2_sftp_*()  fam-
       ily of functions. When an SFTP session is complete, it must be destroyed using the libssh2_sftp_shutdown(3) function.

RETURN VALUE

       A pointer to the newly allocated SFTP instance or NULL on failure.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

       LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.

       LIBSSH2_ERROR_SOCKET_TIMEOUT -

       LIBSSH2_ERROR_SFTP_PROTOCOL  - An invalid SFTP protocol response was received on the socket, or an SFTP operation caused an errorcode to be
       returned by the server.

       LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block.

SEE ALSO

       libssh2_sftp_shutdown(3) libssh2_sftp_open_ex(3)

libssh2 0.15							    1 Jun 2007						      libssh2_sftp_init(3)