Copyright © 2001 - 2007 SILC Project SILC Project Website | SILC Toolkit Reference Manual Index

SILC Toolkit Reference Manual SILC Core Library SILC Authentication Interface SILC Message Interface SILC Channel Interface SILC Command Interface SILC Notify Interface SILC Status Types SILC Modes SILC ID Interface SILC Argument Interface SILC Attributes Interface Packet Protocol Interface SILC Public Key Payload Interface SILC Utility Library Basic Types and Definitions Data Buffer Interface Data Buffer Format Interface Hash Table Interface Memory Allocation Interface Data Stack (memory pool) Interface Finite State Machine Interface Thread Interface Mutual Exclusion Lock Interface Condition Variable Interface Atomic Operations Interface Network (TCP and UDP) Interface Scheduler Interface Asynchronous Operation Interface Abstract Stream Interface Socket Stream Interface File Descriptor Stream Interface File Utility Functions String Utility Interface Snprintf Interface UTF-8 String Interface Stringprep Interface Utility Functions List Interface Dynamic List Interface MIME Interface Time Utility Functions Logging Interface Config File Interface SILC Key Repository Library SILC SKR Interface SILC ASN.1 Library SILC ASN.1 Interface SILC BER interface SILC Client Library Using SILC Client Library Tutorial Arguments for command_reply Client Operation SilcStatus Error Arguments in command_reply Client Operation Arguments for notify Client Operation Unicode and UTF-8 Strings in Client Library Client Library Interface Reference Client Entry Interface Reference SILC Key Exchange Library SILC SKE Interface SILC Connection Authentication Interface SILC VCard Library SILC VCard Interface SILC SFTP Library SILC SFTP Interface SFTP Filesystems Interface SILC HTTP Library SILC HTTP Server Interface SILC HTTP PHP Translator SILC Crypto Library Introduction to SILC RNG SILC RNG Interface SILC Cipher API SILC PKCS API SILC Public Key API SILC PKCS #1 API SILC Hash Interface SILC HMAC Interface SILC Application Utility Library SILC Application Utilities SILC ID Cache Interface SILC Math Library SILC MP Interface SILC Math Interface Resource Links SILC Project Website SILC Protocol Documentation SILC White Paper SILC FAQs
SFTP Filesystems Interface Header: silcsftp_fs.h DESCRIPTION
        SILC SFTP Filesystem interface defines filesystems for the SFTP server
        usage.  The filesystems may be for example virtual memory filesystem
        or real filesystem access.

        Currently only implemented filesystem is memory file system.

        Memory Filesystem:

        Memory filesystem is a virtual filesystem which provides safe access
        to files without actually revealing the underlaying physical filesystem
        hierarchy or real filenames. Virtual directories can be added to the
        filesystem and freely create filesystem hierarchy. The directories
        can have subdirectories and files. The filesystem also provides limited
        status information for files.  The files in the filesystem are
        virtual but they include the path to the real file.  The real path
        includes always a schema which indicates where the file really is
        available.  The only supported schema currently is "file://".  In
        the future it could support various others like "http://" and "ldap://".

        The filesystem also provides security and permission handling for
        directories and files.  Normal POSIX style permissions can be set
        giving thus rights to reading, writing and/or executing.  They behave
        same way as defined in POSIX.  It is also guaranteed that if the
        writing to a file is not allowed in the memory filesystem, but it is
        allowed in real physical filesystem the file still cannot be written.
        However, the real physical filesystem permissions still matter, for
        example if writing is enabled in the memory filesystem but it is not
        enabled on physical filesystem, the file cannot be written.

        The directories cannot be removed from remote access using the
        filesystem access function sftp_rmdir.  This is because the filesystem
        is one-user filesystem and differentiating between users is not
        possible.  Thus, it would allow anyone to remove directories and
        their contents.  Removing directories is possible only locally using
        the silc_sftp_fs_memory_del_dir function.  The same thing is with
        removing files as well.  Files too can be removed only locally using
        the silc_sftp_fs_memory_del_file function.  Also, files can not ever
        be executed from remote access.

        Also some of the file operation flags are not supported, such as
        SILC_SFTP_FXF_CREAT, SILC_SFTP_FXF_TRUNC and SILC_SFTP_FXF_EXCL
        since they would require access to a real filesystem file which does
        not exist yet, or would mean destroying the file.  However, the
        SILC_SFTP_FXF_WRITE is supported since the file aready exists.

        The memory filesystem does not provide symbolic links.
SilcSFTPFilesystemOps SilcSFTPFilesystem SilcSFTPFSMemoryPerm silc_sftp_fs_memory_alloc silc_sftp_fs_memory_free silc_sftp_fs_memory_add_dir silc_sftp_fs_memory_del_dir silc_sftp_fs_memory_add_file silc_sftp_fs_memory_del_file

Copyright © 2001 - 2007 SILC Project SILC Project Website | SILC Toolkit Reference Manual Index