Provided by: sane-utils_1.0.22-7ubuntu1_i386 bug

NAME

       saned - SANE network daemon

SYNOPSIS

       saned [ -a [ username ] | -d [ n ] | -s [ 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  -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) 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 or xinetd, no option can be given.

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]
              [2001:7a8:185e::42:12]/64

       The case of the host names does not matter, so AHost.COM is  considered
       identical to ahost.com.

INETD CONFIGURATION

       For saned to work properly in its default mode of operation, it is also
       necessary to add a configuration line to  /etc/inetd.conf.   Note  that
       your  inetd must support IPv6 if you want to connect to saned over IPv6
       ; xinetd and  openbsd-inetd  are  known  to  support  IPv6,  check  the
       documentation for your inetd daemon.

       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).

       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
              {
                 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-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.

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)