Kerberos 5 Library(3)
SYNOPSIS
#include <krb5.h> krb5_error_code krb5_copy_host_realm(krb5_context context, const krb5_realm *from, krb5_realm **to); krb5_error_code krb5_free_host_realm(krb5_context context, krb5_realm *realmlist); krb5_error_code krb5_get_default_realm(krb5_context context, krb5_realm *realm); krb5_error_code krb5_get_default_realms(krb5_context context, krb5_realm **realm); krb5_error_code krb5_get_host_realm(krb5_context context, const char *host, krb5_realm **realms); krb5_error_code krb5_set_default_realm(krb5_context context, const char *realm);
DESCRIPTION
krb5_copy_host_realm() copies the list of realms from from to to. to should be freed by the caller using krb5_free_host_realm.
krb5_free_host_realm() frees all memory allocated by realmlist.
krb5_get_default_realm() returns the first default realm for this host.
The realm returned should be freed with free().
krb5_get_default_realms() returns a NULL terminated list of default realms for this context. Realms returned by krb5_get_default_realms() should be freed with krb5_free_host_realm().
krb5_get_host_realm() returns a NULL terminated list of realms for host
by looking up the information in the [domain_realm] in krb5.conf or in
DNS. If the mapping in [domain_realm] results in the string dns_locate,
DNS is used to lookup the realm.
When using DNS to a resolve the domain for the host a.b.c,
krb5_get_host_realm() looks for a TXT resource record named
_kerberos.a.b.c, and if not found, it strips off the first component and
tries a again (_kerberos.b.c) until it reaches the root.
If there is no configuration or DNS information found,
krb5_get_host_realm() assumes it can use the domain part of the host to
form a realm. Caller must free realmlist with krb5_free_host_realm().
krb5_set_default_realm() sets the default realm for the context. If NULL
is used as a realm, the [libdefaults]default_realm stanza in krb5.conf is
used. If there is no such stanza in the configuration file, the
krb5_get_host_realm() function is used to form a default realm.