NAME
    saned - SANE network daemon

SYNOPSIS
    saned [-d|-s [n]]

DESCRIPTION
    saned is the SANE (Scanner Access Now Easy) daemon that allows remote
    clients to access image acquisition devices available on the  local
    host.

OPTIONS
    The -d and -s flags request that saned run in debug mode (as opposed to
    inetd(8) mode). In this mode, saned explicitly waits for a connection
    request.  When compiled with debugging enabled, these flags may be fol-
    lowed by a number to request debug info. The larger the number, the
    more verbose the debug output. E.g., -d128 will request printing of
    all debug info. Debug level 0 means no debug output at all. The default
    value is 2. If flag -d is used, the debug messages will be printed to
    stderr while -s requests using syslog.

CONFIGURATION
    First and foremost: please do not install saned as setuid root without
    due consideration.  Especially when using dynamic linking, there is a
    potential for introducing security holes when running this program as
    root.

    The contents of the saned.conf file  is a list of host names or IP
    addresses that are permitted to use local SANE devices.  Connections
    from localhost are always permitted. Empty lines and lines starting
    with a hash mark (#) are ignored. A line containing the single charac-
    ter ``+'' is interpreted to match any hostname. This allows any remote
    machine to use your scanner and may present a security risk, so this
    shouldn't be used unless you know what you're doing. A sample configu-
    ration file is shown below:

    scan-client.somedomain.firm
    # this is a comment
    192.168.0.1

    The case of the host names does not matter, so AHost.COM is considered
    identical to ahost.com.

    For saned to work properly, it is also necessary to add a configuration
    line to /etc/inetd.conf.  The configuration line  normally looks like
    this:

    sane stream tcp nowait saned.saned /usr/sbin/saned saned

    However, if your system uses tcpd(8) for additional security screening,
    you may want to disable saned access control by putting ``+'' in
    saned.conf and use a line of the following form in /etc/inetd.conf
    instead:

    sane  stream tcp  nowait  saned.saned /usr/sbin/tcpd
    /usr/sbin/saned

    Note that both examples assume that there is a saned group and a saned
    user. If you follow this example, please make sure that the access
    permissions on the special device are set such that saned can access
    the scanner (the program generally needs read and write access to scan-
    ner devices).

    If xinetd is installed on your system instead of inetd the following
    example for xinetd.conf may be helpful:

    # default: off
    # description: The sane server accepts requests
    # for network access to a local scanner via the
    # network.
    service sane
    {
   port    = 6566
   socket_type = stream
   wait    = no
   user    = saned
   group    = saned
   server    = /usr/sbin/saned
    }

    Finally, it is also necessary to add a line of the following form to
    /etc/services:

    sane 6566/tcp # SANE network scanner daemon

RESTRICTIONS
    In addition to  the control connection (port 6566) saned also uses a
    data connection. The port of this socket is selected by the operating
    system and can't be specified by the user currently. This may be a
    problem if the connection must go through a firewall (packet filter).

FILES
    /etc/hosts.equiv
    The hosts listed in this file are permitted to access all  local
    SANE devices. Caveat: this file imposes serious security risks
    and its use is not recommended.

    /etc/sane.d/saned.conf
    Contains a list of hosts permitted to access local SANE devices
    (see also description of SANE_CONFIG_DIR below).

    /etc/sane.d/saned.users
    If this file contains lines of the form

    user:password:backend

    access to the listed backends is restricted. A backend may be
    listed multiple times for different user/password  combinations.
    The server uses MD5 encryption if supported by the client.

ENVIRONMENT
    SANE_CONFIG_DIR
    This environment variable specifies the list of directories that
    may contain the configuration file. Under UNIX, the directories
    are separated by a colon (`:'), under OS/2, they are separated
    by a semi-colon (`;'). If this variable is not set, the config-
    uration file is searched in two default directories: first, the
    current working directory (".") and then in /etc/sane.d. If the
    value of the environment variable ends with the directory sepa-
    rator character, then the default directories are searched after
    the explicitly specified directories.  For example, setting
    SANE_CONFIG_DIR to "/tmp/config:" would result in directories
    "tmp/config", ".", and "/etc/sane.d" being searched (in this
    order).

SEE ALSO
    sane(7),  scanimage(1),  xscanimage(1), xcam(1),  sane-dll(5),
    sane-net(5), sane-"backendname"(5)

    http://www.penguin-breeder.org/?page=sane-net

AUTHOR
    David Mosberger