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

SILC Toolkit Reference Manual
SILC VCard Library
SILC VCard Interface
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 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 Math Library
SILC MP Interface
SILC Math Interface
SILC Application Utility Library
SILC Application Utilities
SILC ID Cache Interface
SILC Key Repository Library
SILC SKR Interface
SILC ASN.1 Library
SILC ASN.1 Interface
SILC BER interface
SILC Key Exchange Library
SILC SKE Interface
SILC Connection Authentication Interface
SILC SFTP Library
SILC SFTP Interface
SFTP Filesystems Interface
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 Engine 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 HTTP Library
SILC HTTP Server Interface
SILC HTTP PHP Translator
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