sane-net(5) SANE Scanner Access Now Easy sane-net(5)
sane-net - SANE network backend
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-
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(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-
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-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:
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
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 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/local/etc/sane.d be-
ing searched (in this order).
A colon-separated list of host names or IP addresses to be con-
tacted by this backend.
Number of seconds to wait for a response from the saned(8)
server for the initial connection request.
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.
If saned(8) 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)
Man(1) output converted with