Provided by: sane-utils_1.0.25+git20150528-1ubuntu2.16.04.3_amd64 
NAME
saned - SANE network daemon
SYNOPSIS
saned [ -a [ username ] | -d [ n ] | -s [ n ] | -h ]
DESCRIPTION
saned is the SANE (Scanner Access Now Easy) daemon that allows remote clients to access
image acquisition devices available on the local host.
OPTIONS
The -a flag requests that saned run in standalone daemon mode. In this mode, saned will
detach from the console and run in the background, listening for incoming client
connections; inetd is not required for saned operations in this mode. If the optional
username is given after -a , saned will drop root privileges and run as this user (and
group).
The -d and -s flags request that saned run in debug mode (as opposed to inetd(8) daemon
mode). In this mode, saned 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. E.g., -d128 will request printing
of all debug info. Debug level 0 means no debug output at all. The default value is 2. If
flag -d is used, the debug messages will be printed to stderr while -s requests using
syslog.
If saned is run from inetd, xinetd or systemd, no option can be given.
The -h flag displays a short help message.
CONFIGURATION
First and foremost: saned 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 saned's own authentication. Don't run saned as root if it's not
necessary. And do not install saned as setuid root.
The saned.conf configuration file contains both options for the daemon and the access
list.
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
scan-client.somedomain.firm
# this is a comment
192.168.0.1
192.168.2.12/29
[::1]
[2001:db8:185e::42:12]/64
The case of the host names does not matter, so AHost.COM is considered identical to
ahost.com.
SERVER DAEMON CONFIGURATION
For saned to work properly in its default mode of operation, it is also necessary to add
the appropriate configuration for (x)inetd or systemd. (see below). Note that your inetd
must support IPv6 if you want to connect to saned over IPv6 ; xinetd, openbsd-inetd and
systemd are known to support IPv6, check the documentation for your inetd daemon.
In the sections below the configuration for inetd, xinetd and systemd are described in
more detail.
For the configurations below it is necessary to add a line of the following form to
/etc/services:
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.
INETD CONFIGURATION
It is required to add a single line to the inetd configuration file (/etc/inetd.conf)
The configuration line normally looks like this:
sane-port stream tcp nowait saned.saned /usr/sbin/saned saned
However, if your system uses tcpd(8) for additional security screening, you may want to
disable saned access control by putting ``+'' in saned.conf and use a line of the
following form in /etc/inetd.conf instead:
sane-port stream tcp nowait saned.saned /usr/sbin/tcpd /usr/sbin/saned
Note that both examples assume that there is a saned group and a saned user. If you
follow this example, please make sure that the access permissions on the special device
are set such that saned can access the scanner (the program generally needs read and write
access to scanner devices).
XINETD CONFIGURATION
If xinetd is installed on your system instead of inetd the following example for
/etc/xinetd.conf may be helpful:
# default: off
# description: The sane server accepts requests
# for network access to a local scanner via the
# network.
service sane-port
{
port = 6566
socket_type = stream
wait = no
user = saned
group = saned
server = /usr/sbin/saned
}
SYSTEMD CONFIGURATION
for systemd we need to add 2 configuation files in /etc/systemd/system.
The first file we need to add here is called saned.socket. It shall have the following
contents:
[Unit]
Description=saned incoming socket
[Socket]
ListenStream=6566
Accept=yes
MaxConnections=1
[Install]
WantedBy=sockets.target
The second file to be added is saned@.service with the following contents:
[Unit]
Description=Scanner Service
Requires=saned.socket
[Service]
ExecStart=/usr/sbin/saned
User=saned
Group=saned
StandardInput=null
StandardOutput=syslog
StandardError=syslog
# Environment=SANE_CONFIG_DIR=/etc/sane.d SANE_DEBUG_DLL=255
Is you need to set an environment variable for saned like SANE_CONFIG_DIR you will have to
remove the # on the last line and set the variable appropriately. Multiple variables can
be set by separating the assignments by spaces as shown in the example above.
Unlike (x)inetd systemd allows debugging output from backends set using
SANE_DEBUG_<backend_name> to be captured. With the service unit as described above, the
debugging output is forwarded to the system log.
FILES
/etc/hosts.equiv
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.
/etc/sane.d/saned.conf
Contains a list of hosts permitted to access local SANE devices (see also
description of SANE_CONFIG_DIR below).
/etc/sane.d/saned.users
If this file contains lines of the form
user:password:backend
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.
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).
SEE ALSO
sane(7), scanimage(1), xscanimage(1), xcam(1), sane-dll(5), sane-net(5),
sane-"backendname"(5)
http://www.penguin-breeder.org/?page=sane-net
AUTHOR
David Mosberger
20 Apr 2009 saned(8)