saned - SANE network daemon
SYNOPSIS
saned [-d [n]]
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 -d flag 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, this flag may be followed by a number to
request debug info. The larger the number, the more ver
bose the debug output. E.g., -d128 will request printing
of all debug info.
CONFIGURATION
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 that are permitted to use local SANE devices. Empty
lines and lines starting with a hash mark (#) are ignored.
A line containing the single character ``+'' is inter
preted 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:
scan-client.somedomain.firm
# this is a comment
localhost
The case of the host names does not matter, so AHost.COM
is considered identical to ahost.com.
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 secu
rity screening, you may want to disable saned access con
trol by putting ``+'' in saned.conf and use a line of the
following form in /etc/inetd.conf instead:
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).
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
# network.
service sane
{
port = 6566
socket_type = stream
wait = no
user = saned
group = saned
server = /usr/local/sbin/saned
}
Finally, it is also necessary to add a line of the follow
ing form to /etc/services:
sane 6566/tcp # SANE network scanner daemon
Note that port number 6566 has not been officially
assigned to the SANE network protocol and may thus change
in the future.
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_CON
FIG_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
user/password combinations. The server uses MD5
encryption 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 sepa
rator character, then the default directories are
searched after the explicitly specified directo
ries. 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)
AUTHOR
David Mosberger
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