saned(8)

NAME
saned - SANE network daemon

SYNOPSIS
saned [ -a [ username ] ] [ -u username ] [ -b address ] [ -p port ] [ -l ] [ -D ] [ -o ] [ -d n ] [ -e ] [ -h ] [ -B buffer-size ]

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

saned recognises the following options:

-a [username], --alone[=username]
    is equivalent to the combination of -l -D -u username options. However, username is optional and running user will only be set when specified.

-u username, --user=username
    requests that saned drop root privileges and run as the user (and group) associated with username after binding.

-b address, --bind=address
    tells saned to bind to the address given.

-p port, --port=port
    tells saned to listen on the port given. A value of 0 tells saned to pick an unused port. The default is the sane-port (6566).

-l, --listen
    requests that saned run in standalone daemon mode. In this mode, saned will listen for incoming client connections; inetd(8) is not required for saned operations in this mode.

-D, --daemonize
    will request saned to detach from the console and run in the background.

-n, --allow-network
    allows saned to use network scanners. By default this is forbidden to prevent saned from contacting itself. When enabled, the configuration of the sane-net(5) backend should not mention the address on which saned is listening.

-o, --once
    requests that saned exits after the first client disconnects. This is useful for debugging.

-d n, --debug=n
    sets the level of saned debug output to n. When compiled with debugging enabled, this flag may be followed by a number to request more or less debug info. The larger the number, the more verbose the debug output. E.g., -d128 will request output of all debug info. A level of 0 produces no output at all. The default value is 2.

-e, --stderr
    will divert saned debug output to stderr instead of the syslog default.

-B, --buffer-size=buffer-size
    specifies the size of the read buffer used for communication with the backend in KB. Default value is 1MB.

-h, --help
    displays a short help message.

CONFIGURATION
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.

data_connect_timeout = timeout
    Specify the time in milliseconds that saned will wait for a data connection. Without this option, if the data connection is not done before the scanner reaches the end of scan, the scanner will continue to scan past the end and may damage it depending on the backend. Specify zero to have the old behavior. The default is 4000ms.

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.

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. On *NIX systems, 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).

NOTES
saned does not provide confidentiality when communicating with clients. If saned is exposed directly on the network, other users may be able to intercept scanned images, or learn passwords for connecting to saned, with little effort. Client systems should connect to saned through a secure tunnel to the server instead.

saned is not a trusted program and should not run with root privileges.

Refer to /usr/share/doc/sane/saned/saned.install.md for details on configuring saned as a service.

SEE ALSO
sane(7), scanimage(1), xscanimage(1), xcam(1), sane-dll(5), sane-net(5), sane-"backendname"(5), inetd(8), xinetd(8), systemd(1)
http://www.penguin-breeder.org/?page=sane-net

AUTHOR
David Mosberger