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(8)
              server. This will prevent the backend from blocking for  several
              minutes trying to connect to an unresponsive saned(8) host (net-
              work   outage,   host   down,  ...).  The  environment  variable
              SANE_NET_TIMEOUT can also be used to specify the timeout at run-
              time.

       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 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.  On *NIX systems, the direc-
              tories are separated by a colon (`:'), under OS/2, they are sep-
              arated  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 /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/local/etc/sane.d be-
              ing 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(8)
              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(8) 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)