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host.conf



DESCRIPTION

       The file /etc/host.conf contains configuration information
       specific to the resolver library.  It should  contain  one
       configuration  keyword  per  line, followed by appropriate
       configuration information.  The  keywords  recognized  are
       order,  trim,  multi,  nospoof, spoof, and reorder.  These
       keywords are described below.

       order  This keyword specifies how host lookups are  to  be
              performed.   It  should  be followed by one or more
              lookup methods, separated by commas.  Valid methods
              are bind, hosts, and nis.

       trim   This  keyword  may  be listed more than once.  Each
              time it should be followed by a  list  of  domains,
              separated by colons (`:'), semicolons (`;') or com­
              mas (`,'), with the leading  dot.   When  set,  the
              resolv+  library  will automatically trim the given
              domain name from the end of any  hostname  resolved
              via DNS.  This is intended for use with local hosts
              and domains.  (Related note: trim will  not  affect
              hostnames gathered via NIS or the hosts file.  Care
              should be taken to ensure that the  first  hostname
              for each entry in the hosts file is fully qualified
              or non-qualified,  as  appropriate  for  the  local
              installation.)

       multi  Valid  values  are  on  and off.  If set to on, the
              resolv+ library will return all valid addresses for
              a host that appears in the /etc/hosts file, instead
              of only the first.  This is off by default,  as  it
              may  cause  a substantial performance loss at sites
              with large hosts files.

       nospoof
              Valid values are on and off.  If  set  to  on,  the
              resolv+  library  will  attempt to prevent hostname
              spoofing to enhance the security of rlogin and rsh.
              It  works  as  follows:  after  performing  a  host
              address lookup, resolv+  will  perform  a  hostname
              lookup  for  that address.  If the two hostnames do
              not match, the query will fail.  The default  value
              is off.

       spoofalert
              Valid values are on and off.  If this option is set
              to on and the nospoof option is also  set,  resolv+
              will  log  a  warning  of  the error via the syslog
              facility.  The default value is off.

       spoof  Valid values are off, nowarn  and  warn.   If  this
              will attempt to  reorder  host  addresses  so  that
              local  addresses  (i.e.,  on  the  same subnet) are
              listed first when a gethostbyname(3) is  performed.
              Reordering  is  done  for  all lookup methods.  The
              default value is off.


ENVIRONMENT

       There are six environment variables that can  be  used  to
       allow  users  to override the behavior which is configured
       in /etc/host.conf.

       RESOLV_HOST_CONF
              If set this variable points to a file  that  should
              be read instead of /etc/host.conf.

       RESOLV_SERV_ORDER
              Overrides the order command.

       RESOLV_SPOOF_CHECK
              Overrides  the  nospoof,  spoofalert and spoof com­
              mands in the same  way  as  the  spoof  command  is
              parsed.  Valid values are off, nowarn and warn.

       RESOLV_MULTI
              Overrides the multi command.

       RESOLV_REORDER
              Overrides the reorder command.

       RESOLV_ADD_TRIM_DOMAINS
              A  list  of  domains,   separated  by colons (`:'),
              semicolons (`;') or commas (`,'), with the  leading
              dot,  which  will  be  added to the list of domains
              that should be trimmed.

       RESOLV_OVERRIDE_TRIM_DOMAINS
              A list of  domains,   separated  by  colons  (`:'),
              semicolons  (`;') or commas (`,'), with the leading
              dot, which will replace the list  of  domains  that
              should be trimmed.  Overrides the trim command.


FILES

       /etc/host.conf
              Resolver configuration file

       /etc/resolv.conf
              Resolver configuration file

       /etc/hosts
              Local hosts database


NOTES


  
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