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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Net::SFTP::Foreign::Constants(3pm)			User Contributed Perl Documentation			Net::SFTP::Foreign::Constants(3pm)

NAME
Net::SFTP::Foreign::Constants - Constant definitions for Net::SFTP::Foreign SYNOPSIS
use Net::SFTP::Foreign::Constants qw(:tag SSH2_FILEXFER_VERSION); print "Protocol version is ", SSH2_FILEXFER_VERSION; DESCRIPTION
Net::SFTP::Foreign::Constants provides a list of exportable SFTP constants: for SFTP messages and commands, for file-open flags, for status messages, etc. Constants can be exported individually, or in sets identified by tag names. Net::SFTP::Foreign::Constants provides values for all of the constants listed in the SFTP protocol version 3 draft; the only thing to note is that the constants are listed with the prefix "SSH2_" instead of "SSH_". So, for example, to import the constant for the file-open command, you would write: use Net::SFTP::Foreign::Constants qw( SSH2_FXP_OPEN ); TAGS
As mentioned above, constants can either be imported individually or in sets grouped by tag names. The tag names are: :fxp Imports all of the "SSH2_FXP_*" constants: these are the constants used in the messaging protocol. :flags Imports all of the "SSH2_FXF_*" constants: these are constants used as flags sent to the server when opening files. :att Imports all of the "SSH2_FILEXFER_ATTR_*" constants: these are the constants used to construct the flag in the serialized attributes. The flag describes what types of file attributes are listed in the buffer. :status Imports all of the "SSH2_FX_*" constants: these are constants returned from a server "SSH2_FXP_STATUS" message and indicate the status of a particular operation. :error Imports all the "SFTP_ERR_*" constants used to represent high level errors: "SFTP_ERR_LOCAL_ALREADY_EXISTS", "SFTP_ERR_LOCAL_CHMOD_FAILED", "SFTP_ERR_LOCAL_OPEN_FAILED", "SFTP_ERR_LOCAL_READ_ERROR", "SFTP_ERR_LOCAL_STAT_FAILED", "SFTP_ERR_LOCAL_UTIME_FAILED", "SFTP_ERR_LOCAL_WRITE_FAILED", "SFTP_ERR_REMOTE_BAD_PACKET_SEQUENCE", "SFTP_ERR_REMOTE_BAD_PERMISSIONS", "SFTP_ERR_REMOTE_BAD_TIME", "SFTP_ERR_REMOTE_BLOCK_TOO_SMALL", "SFTP_ERR_REMOTE_CLOSE_FAILED", "SFTP_ERR_REMOTE_FSETSTAT_FAILED", "SFTP_ERR_REMOTE_FSTAT_FAILED", "SFTP_ERR_REMOTE_LSTAT_FAILED", "SFTP_ERR_REMOTE_MKDIR_FAILED", "SFTP_ERR_REMOTE_OPENDIR_FAILED", "SFTP_ERR_REMOTE_OPEN_FAILED", "SFTP_ERR_REMOTE_READDIR_FAILED", "SFTP_ERR_REMOTE_READ_FAILED", "SFTP_ERR_REMOTE_REALPATH_FAILED", "SFTP_ERR_REMOTE_REMOVE_FAILED", "SFTP_ERR_REMOTE_RENAME_FAILED", "SFTP_ERR_REMOTE_RMDIR_FAILED", "SFTP_ERR_REMOTE_READLINK_FAILED", "SFTP_ERR_REMOTE_SYMLINK_FAILED", "SFTP_ERR_REMOTE_SETSTAT_FAILED", "SFTP_ERR_REMOTE_STAT_FAILED", "SFTP_ERR_REMOTE_WRITE_FAILED" and "SFTP_ERR_REMOTE_HARDLINK_FAILED". Note: these constants are not defined on the SFTP draft. :ext Import all the "SSH2_FXE_*" constants: there are the constants defined for usage with SFTP extensions. Currently, these are supported: "SSH2_FXE_STATVFS_ST_RDONLY", "SSH_FXE_STATVFS_ST_NOSUID". There is one constant that does not fit into any of the tag sets: "SSH2_FILEXFER_VERSION", which holds the value of the SFTP protocol implemented by Net::SFTP::Foreign. AUTHOR &; COPYRIGHTS Please see the Net::SFTP::Foreign manpage for author, copyright, and license information. perl v5.14.2 2012-05-11 Net::SFTP::Foreign::Constants(3pm)