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  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 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/lo-
              cal/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 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 has timed out, the net backend may loop with authorization re-
       quests.


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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