saned - SANE network daemon
saned [-d|-s [n]]
saned is the SANE (Scanner Access Now Easy) daemon that allows remote clients to access
image acquisition devices available on the local host.
The -d and -s flags request that saned run in debug mode (as opposed to inetd(8) mode).
In this mode, saned explicitly waits for a connection request. When compiled with debug-
ging 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.
First and foremost: please do not install saned as setuid root without due consideration.
Especially when using dynamic linking, there is a potential for introducing security holes
when running this program as root.
The contents of the saned.conf file is a list of host names or IP addresses that are per-
mitted to use local SANE devices. 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:
# this is a comment
The case of the host names does not matter, so AHost.COM is considered identical to
For saned to work properly, it is also necessary to add a configuration line to
/etc/inetd.conf. The configuration line normally looks like this:
sane 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 follow-
ing form in /etc/inetd.conf instead:
sane 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 fol-
low 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).
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 /etc/services:
sane 6566/tcp # SANE network scanner daemon
In addition to the control connection (port 6566) saned also uses a data connection. The
port of this socket is selected by the operating system and can't be specified by the user
currently. This may be a problem if the connection must go through a firewall (packet fil-
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 descrip-
tion of SANE_CONFIG_DIR below).
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 encryption if sup-
ported 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
SANE_CONFIG_DIR to "/tmp/config:" would result in directories "tmp/config", ".",
and "/etc/sane.d" being searched (in this order).
sane(7), scanimage(1), xscanimage(1), xcam(1), sane-dll(5), sane-net(5), sane-"backend-
8 Oct 2002 saned(1)