sane-net - SANE network backend


   The  sane-net  library  implements  a  SANE  (Scanner  Access Now Easy)
   backend 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
   protected 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_TIMEOUT can also be used  to  specify  the  timeout  at

   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-
   separated list of hostnames or IP addresses that should be contacted in
   addition to  the  hosts  mentioned  in  the  configuration  file.   For
   example, a user could set the environment variable to the string:


   To  request  that  hosts  ,  [::1]  , and 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
          configuration 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 separator 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).

          A  colon-separated  list  of  host  names  or IP addresses to be
          contacted 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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