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# sane-net.5

    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 service in /etc/services.  The sane service should be defined
           using a line of the following form:

                  sane 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/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).

           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(1), sane-dll(5), scanimage(1)

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

## AUTHOR

           David Mosberger and Andreas Beck

    sane-backends 1.0.12-cvs          8 Oct 2002                       sane-net(5)