krb_realmofhost man page on 4.4BSD

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       krb_realmofhost,	   krb_get_phost,    krb_get_krbhst,   krb_get_admhst,
       krb_get_lrealm - additional Kerberos utility routines

       #include <kerberosIV/krb.h>
       #include <kerberosIV/des.h>
       #include <netinet/in.h>

       char *krb_realmofhost(host)
       char *host;

       char *krb_get_phost(alias)
       char *alias;

       char *host;
       char *realm;
       int n;

       char *host;
       char *realm;
       int n;

       char *realm;
       int n;

       krb_realmofhost returns the Kerberos realm of the host host, as	deter‐
       mined by the translation table /etc/kerberosIV/krb.realms.  host should
       be the fully-qualified domain-style primary host name of	 the  host  in
       question.   In  order to prevent certain security attacks, this routine
       must either have a priori knowledge of a host's realm, or  obtain  such
       information securely.

       The  format  of the translation file is described by krb.realms(5).  If
       host exactly matches a  host_name  line,	 the  corresponding  realm  is
       returned.    Otherwise,	if  the	 domain	 portion  of  host  matches  a
       domain_name line, the corresponding realm is returned.	If  host  con‐
       tains a domain, but no translation is found, host's domain is converted
       to upper-case and returned.  If host contains no discernible domain, or
       an   error   occurs,   the   local   realm   name,   as	 supplied   by
       krb_get_lrealm(3), is returned.

       krb_get_phost converts the hostname alias (which can be either an offi‐
       cial  name  or an alias) into the instance name to be used in obtaining
       Kerberos tickets for most services, including the Berkeley  rcmd	 suite
       (rlogin, rcp, rsh).
       The  current  convention is to return the first segment of the official
       domain-style name after conversion to lower case.

       krb_get_krbhst fills in host with the hostname of the nth host  running
       a  Kerberos key distribution center (KDC) for realm realm, as specified
       in the configuration file (/etc/kerberosIV/krb.conf).   The  configura‐
       tion  file  is  described  by krb.conf(5).  If the host is successfully
       filled in, the routine returns KSUCCESS.	 If the file cannot be opened,
       and  n  equals  1,  then the value of KRB_HOST as defined in <krb.h> is
       filled in, and KSUCCESS is returned.  If there are fewer than  n	 hosts
       running	a  Kerberos  KDC for the requested realm, or the configuration
       file is malformed, the routine returns KFAILURE.

       krb_get_admhst fills in host with the hostname of the nth host  running
       a Kerberos KDC database administration server for realm realm, as spec‐
       ified in the configuration  file	 (/etc/kerberosIV/krb.conf).   If  the
       file  cannot be opened or is malformed, or there are fewer than n hosts
       running a Kerberos KDC  database	 administration	 server,  the  routine
       returns KFAILURE.

       The   character	arrays	used  as  return  values  for  krb_get_krbhst,
       krb_get_admhst, should be large enough to hold any  hostname  (MAXHOST‐
       NAMELEN from <sys/param.h>).

       krb_get_lrealm  fills in realm with the nth realm of the local host, as
       specified in the configuration file.  realm should be at least REALM_SZ
       (from <krb.h>)characterslong.

       kerberos(3), krb.conf(5), krb.realms(5)

			   translation file for host-to-realm mapping.

			   local  realm-name  and  realm/server	 configuration

       The current convention for instance names  is  too  limited;  the  full
       domain name should be used.

       krb_get_lrealm currently only supports n = 1.  It should really consult
       the user's ticket cache to determine the user's current	realm,	rather
       than consulting a file on the host.

MIT Project Athena	     Kerberos Version 4.0	    KRB_REALMOFHOST(3)

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