Section: SANE Scanner Access Now Easy (5)
Updated: 14 Jul 2008
sane-net - SANE network backend
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
This backend expects device names of the form:
is the name (or IP address) of the (remote) host and
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
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:
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
server. This will prevent the backend from blocking for several
minutes trying to connect to an unresponsive
host (network outage, host down, ...). The environment variable
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:
# this is a comment
The above list of hosts can be extended at run-time using environment
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
are contacted in addition to the hosts listed above.
For this backend to function properly, it is also necessary to define the
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
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
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
to "/tmp/config:" would result in directories
being searched (in this order).
A colon-separated list of host names or IP addresses to be contacted by this
Number of seconds to wait for a response from the
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.
has timed out, the net backend may loop with authorization requests.
David Mosberger and Andreas Beck