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

NAME
       saned - SANE network daemon

SYNOPSIS
       saned [ -a [ username ] | -d [ n ] | -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  -a flag requests that saned run in standalone daemon mode. In this
       mode, saned will detach from the console and  run  in  the  background,
       listening  for  incoming	 client connections; inetd is not required for
       saned operations in this mode. If the optional username is given	 after
       -a , saned will drop root privileges and run as this user (and group).

       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
       authentication.	Don't  run saned as root if it's not necessary. And do
       not install saned as setuid root.

       The saned.conf configuration file contains both options for the	daemon
       and the access list.

       data_portrange = min_port - max_port
	      Specify  the  port  range to use for the data connection. Pick a
	      port range between 1024 and 65535; don't pick a too  large  port
	      range,  as  it  may  have performance issues. Use this option if
	      your saned server is sitting behind a firewall. If that firewall
	      is  a  Linux  machine, we strongly recommend using the Netfilter
	      nf_conntrack_sane module instead.

       The access list 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 localhost are always permit‐
       ted. 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:

	      # Daemon options
	      data_portrange = 10000 - 10100
	      # Access list
	      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.

INETD CONFIGURATION
       For saned to work properly in its default mode of operation, 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	 docu‐
       mentation 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.

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 hashing 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

				  20 Apr 2009			      saned(8)
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