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

NAME
       sane-net	- SANE network backend

DESCRIPTION
       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.

DEVICE NAMES
       This backend expects device names of the	form:

	      host:device

       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:

	      [::1]:device

CONFIGURATION
       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(8)
	      server.  This will prevent the backend from blocking for several
	      minutes trying to	connect	to an unresponsive saned(8) host (net-
	      work   outage,   host   down,  ...).  The	 environment  variable
	      SANE_NET_TIMEOUT can also	be used	to specify the timeout at run-
	      time.

       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:

	      scan-server.somedomain.firm
	      192.168.0.1
	      #	this is	a comment
	      localhost
	      ::1

       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 ad-
       dition to the hosts mentioned in	the configuration file.	 For  example,
       a user could set	the environment	variable to the	string:

	      new.scanner.com:[::1]:192.168.0.2:scanner.univ.edu

       To  request  that hosts new.scanner.com , [::1] , 192.168.0.2 and scan-
       ner.univ.edu 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 de-
       fined using a line of the following form:

	      sane-port	6566/tcp # SANE	network	scanner	daemon

FILES
       /usr/local/etc/sane.d/net.conf
	      The  backend  configuration  file	 (see  also   description   of
	      SANE_CONFIG_DIR below).

       /usr/local/lib/sane/libsane-net.a
	      The static library implementing this backend.

       /usr/local/lib/sane/libsane-net.so
	      The shared library implementing this backend (present on systems
	      that support dynamic loading).

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/lo-
	      cal/etc/sane.d.  If the value of the environment	variable  ends
	      with  the	directory separator character, then the	default	direc-
	      tories are searched after	the explicitly specified  directories.
	      For example, setting SANE_CONFIG_DIR to "/tmp/config:" would re-
	      sult in directories tmp/config, ., and /usr/local/etc/sane.d be-
	      ing searched (in this order).

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

       SANE_NET_TIMEOUT
	      Number of	seconds	to wait	 for  a	 response  from	 the  saned(8)
	      server for the initial connection	request.

       SANE_DEBUG_NET
	      If the library was compiled with debug support enabled, this en-
	      vironment	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.

BUGS
       If saned(8) has timed out, the net backend may loop with	 authorization
       requests.

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

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

AUTHOR
       David Mosberger and Andreas Beck

				  14 Jul 2008			   sane-net(5)

NAME | DESCRIPTION | DEVICE NAMES | CONFIGURATION | FILES | ENVIRONMENT | BUGS | SEE ALSO | AUTHOR

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