saned(8)		 SANE Scanner Access Now Easy		      saned(8)



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,  IP
       addresses or IP subnets (CIDR notation) that are permitted to use local
       SANE devices. IPv6 addresses must be enclosed in brackets,  and	should
       always  be specified in their compressed form.  Connections from local-
       host are always permitted.  Empty lines and lines starting with a  hash
       mark  (#) are ignored.  A line containing the single character ``+'' 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 configuration file is
       shown below:

	      scan-client.somedomain.firm
	      # this is a comment
	      192.168.0.1
	      192.168.2.12/29
	      [::1]
	      [2001:7a8:185e::42:12]/64

       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.	 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-port 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-port	  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
	      {
		 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-port 6566/tcp # SANE network scanner daemon

       The  official  IANA  short name for port 6566 is "sane-port". The older
       name "sane" is now deprecated.


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).
       If you must use a packet filter, make sure that all ports  >  1024  are
       open on the server for connections from the client.


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



sane-backends 1.0.18		  30 May 2004			      saned(8)