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

SILC Toolkit Reference Manual
SILC Crypto Library
    Introduction to SILC RNG
    SILC RNG Interface
    SILC Cipher API
    SILC Public Key API
    SILC Hash Interface
    SILC HMAC 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 Key Exchange Library
    SILC SKE Interface
    SILC Connection Authentication Interface
SILC VCard Library
    SILC VCard Interface
SILC Math Library
    SILC MP Interface
    SILC Math 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 ASN.1 Library
    SILC ASN.1 Interface
    SILC BER interface
    SILC HTTP Server Interface
    SILC HTTP PHP Translator
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 Application Utility Library
    SILC Application Utilities
    SILC ID Cache Interface
    SILC SFTP Interface
    SFTP Filesystems Interface

Resource Links
SILC Project Website
SILC Protocol Documentation
SILC White Paper

SFTP Filesystems Interface
Header: silcsftp_fs.h


    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
    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