/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/ser_princ.c - Serialize krb5_principal structure */
/*
 * Copyright 1995 by the Massachusetts Institute of Technology.
 * All Rights Reserved.
 *
 * Export of this software from the United States of America may
 *   require a specific license from the United States Government.
 *   It is the responsibility of any person or organization contemplating
 *   export to obtain such a license before exporting.
 *
 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
 * distribute this software and its documentation for any purpose and
 * without fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright notice and
 * this permission notice appear in supporting documentation, and that
 * the name of M.I.T. not be used in advertising or publicity pertaining
 * to distribution of the software without specific, written prior
 * permission.  Furthermore if you modify this software you must label
 * your software as modified software and not distribute it in such a
 * fashion that it might be confused with the original M.I.T. software.
 * M.I.T. makes no representations about the suitability of
 * this software for any purpose.  It is provided "as is" without express
 * or implied warranty.
 */

#include "k5-int.h"
#include "int-proto.h"

krb5_error_code
k5_size_principal(krb5_principal principal, size_t *sizep)
{
    krb5_error_code     kret;
    char                *fname;

    /*
     * krb5_principal requires:
     *  krb5_int32                      for KV5M_PRINCIPAL
     *  krb5_int32                      for flattened name size
     *  strlen(name)                    for name.
     *  krb5_int32                      for KV5M_PRINCIPAL
     */
    kret = EINVAL;
    if (principal != NULL &&
        !(kret = krb5_unparse_name(NULL, principal, &fname))) {
        *sizep += (3*sizeof(krb5_int32)) + strlen(fname);
        free(fname);
    }
    return(kret);
}

krb5_error_code
k5_externalize_principal(krb5_principal principal,
                         krb5_octet **buffer, size_t *lenremain)
{
    krb5_error_code     kret;
    size_t              required;
    krb5_octet          *bp;
    size_t              remain;
    char                *fname;

    required = 0;
    bp = *buffer;
    remain = *lenremain;
    kret = EINVAL;
    if (principal != NULL) {
        kret = ENOMEM;
        if (!k5_size_principal(principal, &required) && required <= remain) {
            if (!(kret = krb5_unparse_name(NULL, principal, &fname))) {

                (void) krb5_ser_pack_int32(KV5M_PRINCIPAL, &bp, &remain);
                (void) krb5_ser_pack_int32((krb5_int32) strlen(fname),
                                           &bp, &remain);
                (void) krb5_ser_pack_bytes((krb5_octet *) fname,
                                           strlen(fname), &bp, &remain);
                (void) krb5_ser_pack_int32(KV5M_PRINCIPAL, &bp, &remain);
                *buffer = bp;
                *lenremain = remain;

                free(fname);
            }
        }
    }
    return(kret);
}

krb5_error_code
k5_internalize_principal(krb5_principal *argp,
                         krb5_octet **buffer, size_t *lenremain)
{
    krb5_error_code     kret;
    krb5_principal      principal = NULL;
    krb5_int32          ibuf;
    krb5_octet          *bp;
    size_t              remain;
    char                *tmpname = NULL;

    *argp = NULL;
    bp = *buffer;
    remain = *lenremain;

    /* Read our magic number */
    if (krb5_ser_unpack_int32(&ibuf, &bp, &remain) || ibuf != KV5M_PRINCIPAL)
        return EINVAL;

    /* Read the principal name */
    kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
    if (kret)
        return kret;
    tmpname = malloc(ibuf + 1);
    kret = krb5_ser_unpack_bytes((krb5_octet *) tmpname, (size_t) ibuf,
                                 &bp, &remain);
    if (kret)
        goto cleanup;
    tmpname[ibuf] = '\0';

    /* Parse the name to a principal structure */
    kret = krb5_parse_name_flags(NULL, tmpname,
                                 KRB5_PRINCIPAL_PARSE_REQUIRE_REALM,
                                 &principal);
    if (kret)
        goto cleanup;

    /* Read the trailing magic number */
    if (krb5_ser_unpack_int32(&ibuf, &bp, &remain) || ibuf != KV5M_PRINCIPAL) {
        kret = EINVAL;
        goto cleanup;
    }

    *buffer = bp;
    *lenremain = remain;
    *argp = principal;
cleanup:
    if (kret)
        krb5_free_principal(NULL, principal);
    free(tmpname);
    return kret;
}