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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)