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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
	      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:

	      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/arch_triplet/sane/libsane-net.a
	      The static library implementing this backend.

       /usr/lib/arch_triplet/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_NET_TIMEOUT
	      Number  of  seconds to wait for a response from the saned server
	      for the initial connection request.

       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

				  14 Jul 2008			   sane-net(5)
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