is the SANE (Scanner Access Now Easy) daemon that allows remote clients
to access image acquisition devices available on the local host.
flag requests that
run in standalone daemon mode. In this mode,
will detach from the console and run in the background, listening for incoming
is not required for
operations in this mode. If the optional
is given after
will drop root privileges and run as this user (and group).
flags request that
run in debug mode (as opposed to
mode). In this mode,
explicitly waits for a connection request. When compiled with
debugging enabled, these flags may be followed by a number to request
debug info. The larger the number, the more verbose the debug output.
will request printing of all debug info. Debug level 0 means no debug output
at all. The default value is 2. If flag
is used, the debug messages will be printed to stderr while
requests using syslog.
is run from inetd or xinetd, no option can be given.
First and foremost:
is not intended to be exposed to the internet or other non-trusted
networks. Make sure that access is limited by tcpwrappers and/or a firewall
setup. Don't depend only on
own authentication. Don't run
as root if it's not necessary. And do
as setuid root.
configuration file contains both options for the daemon and the access
data_portrange = min_port - max_port
Specify the port range to use for the data connection. Pick a port
range between 1024 and 65535; don't pick a too large port range, as it
may have performance issues. Use this option if your saned
server is sitting behind a firewall. If that firewall is a Linux
machine, we strongly recommend using the Netfilter
nf_conntrack_sane module instead.
The access list is a list of host names, IP addresses or IP subnets
(CIDR notation) that are permitted to use local SANE devices. IPv6
addresses must be enclosed in brackets, and should always be specified
in their compressed form. Connections from localhost are always
permitted. Empty lines and lines starting with a hash mark (#) are
ignored. A line containing the single character ``+'' is interpreted
to match any hostname. This allows any remote machine to use your
scanner and may present a security risk, so this shouldn't be used
unless you know what you're doing.
A sample configuration file is shown below:
# Daemon options
data_portrange = 10000 - 10100
# Access list
# this is a comment
The case of the host names does not matter, so AHost.COM is considered
identical to ahost.com.
to work properly in its default mode of operation, it is also necessary to add
a configuration line to
Note that your inetd must support IPv6 if you
want to connect to saned over IPv6 ; xinetd and openbsd-inetd are known to
support IPv6, check the documentation for your inetd daemon.
However, if your system uses
for additional security screening, you may want to disable saned
access control by putting ``+'' in
and use a line of the following form in
Note that both examples assume that there is a
group and a
user. If you follow this example, please make sure that the
access permissions on the special device are set such that
can access the scanner (the program generally needs read and
write access to scanner devices).
If xinetd is installed on your system instead of inetd the following example
for xinetd.conf may be helpful:
# default: off
# description: The sane server accepts requests
# for network access to a local scanner via the
port = 6566
socket_type = stream
wait = no
user = saned
group = saned
server = /usr/sbin/saned
Finally, it is also necessary to add a line of the following form to
sane-port 6566/tcp # SANE network scanner daemon
The official IANA short name for port 6566 is "sane-port". The older name "sane"
is now deprecated.
The hosts listed in this file are permitted to access all local SANE
devices. Caveat: this file imposes serious security risks and its use
is not recommended.
Contains a list of hosts permitted to access local SANE devices (see
also description of
If this file contains lines of the form
access to the listed backends is restricted. A backend may be listed multiple
times for different user/password combinations. The server uses MD5 hashing
if supported by the client.
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
to "/tmp/config:" would result in directories "tmp/config", ".", and
"/etc/sane.d" being searched (in this order).