Sane-net

Computing: Linux: optical scanners: sane-net

NAME
sane-net - SANE network backend

DESCRIPTION
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.

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-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:

new.scanner.com:[::1]:192.168.0.2:scanner.univ.edu

To request  that hosts new.scanner.com, [::1] , 192.168.0.2 and scanner.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/sane/libsane-net.a
 * The static library implementing this backend.
 * /usr/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 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).
 * SANE_NET_HOSTS
 * A colon-separated list of host names or IP addresses to be contacted 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.

AUTHOR
David Mosberger and Andreas Beck

Update Log

 * 2005-10-11 Transcribed from Kubuntu Manpage dated 2002-10-08