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  contents  of  the  net.conf	 file  is  a list of host names (or IP
       addresses) that should be contacted for scan requests.  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
       addition to the hosts mentioned in the configuration file.   For	 exam-
       ple, 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
       defined using a line of the following form:

	      sane-port 6566/tcp # SANE network scanner daemon

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

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

       /usr/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 /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).

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

       SANE_DEBUG_NET
	      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.

BUGS
       If  saned  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



sane-backends 1.0.18		  8 Oct 2002			   sane-net(5)