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# saned.1

    saned(1)                 SANE Scanner Access Now Easy                 saned(1)

## 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.

           If saned is run from inetd or xinetd, no option can be given.

## CONFIGURATION

           First and foremost: saned is not intended to be exposed to the internet
           or other non-trusted networks. Make sure that access is limited by tcp-
           wrappers and/or a firewall setup. Don't  depend  only  on  saned's  own
           authentification. Don't run saned as root if it's not necessary. And do
           not install saned as setuid 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
                  ::1

           The  case of the host names does not matter, so AHost.COM is considered
           identical to ahost.com. IPv6 addresses should always  be  specified  in
           their compressed form.

           For saned to work properly, it is also necessary to add a configuration
           line to /etc/inetd.conf.  Note that your inetd must support IPv6 if you
           want to connect to saned over IPv6 ; xinetd and openbsd-inetd are known
           to support IPv6, check the documentation for your inetd daemon.

           The configuration line normally looks like this:

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

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

           /usr/local/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
                  /usr/local/etc/sane.d.  If the value of the environment variable
                  ends  with  the  directory separator character, then the default
                  directories are searched after the explicitly specified directo-
                  ries.   For  example,  setting SANE_CONFIG_DIR to "/tmp/config:"
                  would   result   in   directories   "tmp/config",    ".",    and
                  "/usr/local/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

    sane-backends 1.0.12-cvs          9 Feb 2003                          saned(1)