/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* #pragma ident        "@(#)g_canon_name.c     1.15    04/02/23 SMI" */

/*
 * routine gss_canonicalize_name
 *
 * This routine is used to produce a mechanism specific
 * representation of name that has been previously
 * imported with gss_import_name.  The routine uses the mechanism
 * specific implementation of gss_import_name to implement this
 * function.
 *
 * We allow a NULL output_name, in which case we modify the
 * input_name to include the mechanism specific name.
 */

#include <mglueP.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <errno.h>

static OM_uint32
val_canon_name_args(
        OM_uint32 *minor_status,
        const gss_name_t input_name,
        const gss_OID mech_type,
        gss_name_t *output_name)
{

        /* Initialize outputs. */

        if (minor_status != NULL)
                *minor_status = 0;

        if (output_name != NULL)
                *output_name = GSS_C_NO_NAME;

        /* Validate arguments. */

        if (minor_status == NULL)
                return (GSS_S_CALL_INACCESSIBLE_WRITE);

        if (input_name == GSS_C_NO_NAME || mech_type == GSS_C_NULL_OID)
                return (GSS_S_CALL_INACCESSIBLE_READ);

        return (GSS_S_COMPLETE);
}


OM_uint32 KRB5_CALLCONV
gss_canonicalize_name(OM_uint32 *minor_status, const gss_name_t input_name,
                      const gss_OID mech_type, gss_name_t *output_name)
{
        gss_union_name_t in_union, out_union = NULL, dest_union = NULL;
        OM_uint32 major_status = GSS_S_FAILURE, tmpmin;
        gss_OID selected_mech;

        major_status = val_canon_name_args(minor_status,
                                           input_name,
                                           mech_type,
                                           output_name);
        if (major_status != GSS_S_COMPLETE)
                return (major_status);

        major_status = gssint_select_mech_type(minor_status, mech_type,
                                               &selected_mech);
        if (major_status != GSS_S_COMPLETE)
                return (major_status);

        /* Initial value needed below. */
        major_status = GSS_S_FAILURE;

        in_union = (gss_union_name_t)input_name;
        /*
         * If the caller wants to reuse the name, and the name has already
         * been converted, then there is nothing for us to do.
         */
        if (!output_name && in_union->mech_type &&
            g_OID_equal(in_union->mech_type, selected_mech))
                return (GSS_S_COMPLETE);

        /* ok, then we need to do something - start by creating data struct */
        if (output_name) {
                out_union =
                        (gss_union_name_t)malloc(sizeof (gss_union_name_desc));
                if (!out_union)
                        goto allocation_failure;

                out_union->mech_type = 0;
                out_union->mech_name = 0;
                out_union->name_type = 0;
                out_union->external_name = 0;
                out_union->loopback = out_union;

                /* Allocate the buffer for the user specified representation */
                if (gssint_create_copy_buffer(in_union->external_name,
                                &out_union->external_name, 1))
                        goto allocation_failure;

                if (in_union->name_type != GSS_C_NULL_OID) {
                    major_status = generic_gss_copy_oid(minor_status,
                                                        in_union->name_type,
                                                        &out_union->name_type);
                    if (major_status) {
                        map_errcode(minor_status);
                        goto allocation_failure;
                    }
                }

        }

        /*
         * might need to delete any old mechanism names if we are
         * reusing the buffer.
         */
        if (!output_name) {
                if (in_union->mech_type) {
                        (void) gssint_release_internal_name(minor_status,
                                                        in_union->mech_type,
                                                        &in_union->mech_name);
                        (void) gss_release_oid(minor_status,
                                            &in_union->mech_type);
                        in_union->mech_type = 0;
                }
                dest_union = in_union;
        } else
                dest_union = out_union;

        /* now let's create the new mech name */
        if ((major_status = generic_gss_copy_oid(minor_status, selected_mech,
                                                 &dest_union->mech_type))) {
            map_errcode(minor_status);
            goto allocation_failure;
        }

        if ((major_status =
                gssint_import_internal_name(minor_status, selected_mech,
                                                in_union,
                                                &dest_union->mech_name)))
                goto allocation_failure;

        if (output_name)
                *output_name = (gss_name_t)dest_union;

        return (GSS_S_COMPLETE);

allocation_failure:
        if (out_union) {
            /* Release the partly constructed out_union. */
            gss_name_t name = (gss_name_t)out_union;
            (void) gss_release_name(&tmpmin, &name);
        } else if (!output_name) {
            /* Release only the mech name fields in in_union. */
            if (in_union->mech_name) {
                (void) gssint_release_internal_name(&tmpmin,
                                                    dest_union->mech_type,
                                                    &dest_union->mech_name);
            }
            if (in_union->mech_type)
                (void) gss_release_oid(&tmpmin, &dest_union->mech_type);
        }

        return (major_status);
} /**********  gss_canonicalize_name ********/