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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