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sane-net(5)		 SANE Scanner Access Now Easy		   sane-net(5)

       sane-net	- SANE network backend

       The  sane-net library implements	a SANE (Scanner	Access Now Easy) back-
       end that	provides access	to image acquisition devices through a network
       connection.   This  makes  it possible to control devices attached to a
       remote host and also provides a means to	grant  users  access  to  pro-
       tected resources.

       This backend expects device names of the	form:


       Where  host is the name (or IP address) of the (remote) host and	device
       is the name of the device on this host that should  be  addressed.   If
       the device name does not	contain	a colon	(:), then the entire string is
       treated as the device string for	the default host.  The default host is
       the host	listed last in the configuration file (see below).

       An IPv6 address can be specified	enclosed in square brackets:


       The  net.conf  file  contains  both  backend options and	a list of host
       names (or IP addresses) that should be  contacted  for  scan  requests.
       Anything	 that isn't one	of the options listed below will be treated as
       an host name.

       connect_timeout = nsecs
	      Timeout (in seconds) for the initial  connection	to  the	 saned
	      server.  This will prevent the backend from blocking for several
	      minutes trying to	connect	to an unresponsive saned host (network
	      outage, host down, ...). The environment variable	SANE_NET_TIME-
	      OUT can also be used to specify the timeout at runtime.

       Empty lines and lines starting with a hash mark (#) are ignored.	  Note
       that  IPv6  addresses in	this file do not need to be enclosed in	square
       brackets.  A sample configuration file is shown below:

	      #	this is	a comment

       The above list of hosts can be extended at run-time  using  environment
       variable	 SANE_NET_HOSTS.   This	 environment variable is a colon-sepa-
       rated list of hostnames or IP addresses that  should  be	 contacted  in
       addition	 to  the hosts mentioned in the	configuration file.  For exam-
       ple, a user could set the environment variable to the string:[::1]

       To request that hosts , [::1] ,  and	 scan- are	contacted in addition to the hosts listed above.

       For  this  backend to function properly,	it is also necessary to	define
       the sane-port service in	/etc/services.	The  sane  service  should  be
       defined using a line of the following form:

	      sane-port	6566/tcp # SANE	network	scanner	daemon

	      The   backend   configuration  file  (see	 also  description  of
	      SANE_CONFIG_DIR below).

	      The static library implementing this backend.

	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

	      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).

	      A	colon-separated	list of	host names or IP addresses to be  con-
	      tacted by	this backend.

	      Number  of  seconds to wait for a	response from the saned	server
	      for the initial connection request.

	      If the library was compiled with	debug  support	enabled,  this
	      environment  variable controls the debug level for this backend.
	      E.g., a value of 128 requests all	debug output  to  be  printed.
	      Smaller levels reduce verbosity.

       If  saned  has  timed  out, the net backend may loop with authorization

       sane(7),	saned(8), sane-dll(5), scanimage(1)

       David Mosberger and Andreas Beck

				  14 Jul 2008			   sane-net(5)


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