NAME

     krb5_get_default_principal, krb5_principal, krb5_build_principal, krb5_build_principal_ext,
     krb5_build_principal_va, krb5_build_principal_va_ext, krb5_copy_principal,
     krb5_free_principal, krb5_make_principal, krb5_parse_name, krb5_parse_name_flags,
     krb5_parse_nametype, krb5_princ_set_realm, krb5_principal_compare,
     krb5_principal_compare_any_realm, krb5_principal_get_comp_string, krb5_principal_get_realm,
     krb5_principal_get_type, krb5_principal_match, krb5_principal_set_type, krb5_realm_compare,
     krb5_sname_to_principal, krb5_sock_to_principal, krb5_unparse_name, krb5_unparse_name_flags,
     krb5_unparse_name_fixed, krb5_unparse_name_fixed_flags, krb5_unparse_name_fixed_short,
     krb5_unparse_name_short — Kerberos 5 principal handling functions

LIBRARY

     Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

     #include <krb5.h>

     krb5_principal;

     void
     krb5_free_principal(krb5_context context, krb5_principal principal);

     krb5_error_code
     krb5_parse_name(krb5_context context, const char *name, krb5_principal *principal);

     krb5_error_code
     krb5_parse_name_flags(krb5_context context, const char *name, int flags,
         krb5_principal *principal);

     krb5_error_code
     krb5_unparse_name(krb5_context context, krb5_const_principal principal, char **name);

     krb5_error_code
     krb5_unparse_name_flags(krb5_context context, krb5_const_principal principal, int flags,
         char **name);

     krb5_error_code
     krb5_unparse_name_fixed(krb5_context context, krb5_const_principal principal, char *name,
         size_t len);

     krb5_error_code
     krb5_unparse_name_fixed_flags(krb5_context context, krb5_const_principal principal,
         int flags, char *name, size_t len);

     krb5_error_code
     krb5_unparse_name_short(krb5_context context, krb5_const_principal principal, char **name);

     krb5_error_code
     krb5_unparse_name_fixed_short(krb5_context context, krb5_const_principal principal,
         char *name, size_t len);

     void
     krb5_princ_set_realm(krb5_context context, krb5_principal principal, krb5_realm *realm);

     krb5_error_code
     krb5_build_principal(krb5_context context, krb5_principal *principal, int rlen,
         krb5_const_realm realm, ...);

     krb5_error_code
     krb5_build_principal_va(krb5_context context, krb5_principal *principal, int rlen,
         krb5_const_realm realm, va_list ap);

     krb5_error_code
     krb5_build_principal_ext(krb5_context context, krb5_principal *principal, int rlen,
         krb5_const_realm realm, ...);

     krb5_error_code
     krb5_build_principal_va_ext(krb5_context context, krb5_principal *principal, int rlen,
         krb5_const_realm realm, va_list ap);

     krb5_error_code
     krb5_make_principal(krb5_context context, krb5_principal *principal, krb5_const_realm realm,
         ...);

     krb5_error_code
     krb5_copy_principal(krb5_context context, krb5_const_principal inprinc,
         krb5_principal *outprinc);

     krb5_boolean
     krb5_principal_compare(krb5_context context, krb5_const_principal princ1,
         krb5_const_principal princ2);

     krb5_boolean
     krb5_principal_compare_any_realm(krb5_context context, krb5_const_principal princ1,
         krb5_const_principal princ2);

     const char *
     krb5_principal_get_comp_string(krb5_context context, krb5_const_principal principal,
         unsigned int component);

     const char *
     krb5_principal_get_realm(krb5_context context, krb5_const_principal principal);

     int
     krb5_principal_get_type(krb5_context context, krb5_const_principal principal);

     krb5_boolean
     krb5_principal_match(krb5_context context, krb5_const_principal principal,
         krb5_const_principal pattern);

     void
     krb5_principal_set_type(krb5_context context, krb5_principal principal, int type);

     krb5_boolean
     krb5_realm_compare(krb5_context context, krb5_const_principal princ1,
         krb5_const_principal princ2);

     krb5_error_code
     krb5_sname_to_principal(krb5_context context, const char *hostname, const char *sname,
         int32_t type, krb5_principal *ret_princ);

     krb5_error_code
     krb5_sock_to_principal(krb5_context context, int socket, const char *sname, int32_t type,
         krb5_principal *principal);

     krb5_error_code
     krb5_get_default_principal(krb5_context context, krb5_principal *princ);

     krb5_error_code
     krb5_parse_nametype(krb5_context context, const char *str, int32_t *type);

DESCRIPTION

     krb5_principal holds the name of a user or service in Kerberos.

     A principal has two parts, a PrincipalName and a realm.  The PrincipalName consists of one
     or more components. In printed form, the components are separated by /.  The PrincipalName
     also has a name-type.

     Examples of a principal are nisse/root@EXAMPLE.COM and host/datan.kth.se@KTH.SE.
     krb5_parse_name() and krb5_parse_name_flags() passes a principal name in name to the
     kerberos principal structure.  krb5_parse_name_flags() takes an extra flags argument the
     following flags can be passed in

     KRB5_PRINCIPAL_PARSE_NO_REALM
             requires the input string to be without a realm, and no realm is stored in the
             principal return argument.

     KRB5_PRINCIPAL_PARSE_REQUIRE_REALM
             requires the input string to with a realm.

     krb5_unparse_name() and krb5_unparse_name_flags() prints the principal princ to the string
     name.  name should be freed with free(3).  To the flags argument the following flags can be
     passed in

     KRB5_PRINCIPAL_UNPARSE_SHORT
             no realm if the realm is one of the local realms.

     KRB5_PRINCIPAL_UNPARSE_NO_REALM
             never include any realm in the principal name.

     KRB5_PRINCIPAL_UNPARSE_DISPLAY
             don't quote
     On failure name is set to NULL.  krb5_unparse_name_fixed() and
     krb5_unparse_name_fixed_flags() behaves just like krb5_unparse(), but instead unparses the
     principal into a fixed size buffer.

     krb5_unparse_name_short() just returns the principal without the realm if the principal is
     in the default realm. If the principal isn't, the full name is returned.
     krb5_unparse_name_fixed_short() works just like krb5_unparse_name_short() but on a fixed
     size buffer.

     krb5_build_principal() builds a principal from the realm realm that has the length rlen.
     The following arguments form the components of the principal.  The list of components is
     terminated with NULL.

     krb5_build_principal_va() works like krb5_build_principal() using vargs.

     krb5_build_principal_ext() and krb5_build_principal_va_ext() take a list of length-value
     pairs, the list is terminated with a zero length.

     krb5_make_principal() works the same way as krb5_build_principal(), except it figures out
     the length of the realm itself.

     krb5_copy_principal() makes a copy of a principal.  The copy needs to be freed with
     krb5_free_principal().

     krb5_principal_compare() compares the two principals, including realm of the principals and
     returns TRUE if they are the same and FALSE if not.

     krb5_principal_compare_any_realm() works the same way as krb5_principal_compare() but
     doesn't compare the realm component of the principal.

     krb5_realm_compare() compares the realms of the two principals and returns TRUE is they are
     the same, and FALSE if not.

     krb5_principal_match() matches a principal against a pattern.  The pattern is a globbing
     expression, where each component (separated by /) is matched against the corresponding
     component of the principal.

     The krb5_principal_get_realm() and krb5_principal_get_comp_string() functions return parts
     of the principal, either the realm or a specific component.  Both functions return string
     pointers to data inside the principal, so they are valid only as long as the principal
     exists.

     The component argument to krb5_principal_get_comp_string() is the index of the component to
     return, from zero to the total number of components minus one. If the index is out of range
     NULL is returned.

     krb5_principal_get_realm() and krb5_principal_get_comp_string() are replacements for
     krb5_princ_component() and related macros, described as internal in the MIT API
     specification.  Unlike the macros, these functions return strings, not krb5_data.  A reason
     to return krb5_data was that it was believed that principal components could contain binary
     data, but this belief was unfounded, and it has been decided that principal components are
     infact UTF8, so it's safe to use zero terminated strings.

     It's generally not necessary to look at the components of a principal.

     krb5_principal_get_type() and krb5_principal_set_type() get and sets the name type for a
     principal.  Name type handling is tricky and not often needed, don't use this unless you
     know what you do.

     krb5_sname_to_principal() and krb5_sock_to_principal() are for easy creation of “service”
     principals that can, for instance, be used to lookup a key in a keytab.  For both functions
     the sname parameter will be used for the first component of the created principal.  If sname
     is NULL, “host” will be used instead.

     krb5_sname_to_principal() will use the passed hostname for the second component.  If type is
     KRB5_NT_SRV_HST this name will be looked up with gethostbyname().  If hostname is NULL, the
     local hostname will be used.

     krb5_sock_to_principal() will use the “sockname” of the passed socket, which should be a
     bound AF_INET or AF_INET6 socket.  There must be a mapping between the address and
     “sockname”.  The function may try to resolve the name in DNS.

     krb5_get_default_principal() tries to find out what's a reasonable default principal by
     looking at the environment it is running in.

     krb5_parse_nametype() parses and returns the name type integer value in type.  On failure
     the function returns an error code and set the error string.

SEE ALSO

     krb5_config(3), krb5.conf(5)

BUGS

     You can not have a NUL in a component in some of the variable argument functions above.
     Until someone can give a good example of where it would be a good idea to have NUL's in a
     component, this will not be fixed.