/*
 * Copyright (c) 1997-2004 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "ktutil_locl.h"

RCSID("$Id: copy.c 14260 2004-09-23 14:45:29Z joda $");


static krb5_boolean
compare_keyblock(const krb5_keyblock *a, const krb5_keyblock *b)
{
    if(a->keytype != b->keytype ||
       a->keyvalue.length != b->keyvalue.length ||
       memcmp(a->keyvalue.data, b->keyvalue.data, a->keyvalue.length) != 0)
	return FALSE;
    return TRUE;
}

static int
kt_copy_int (const char *from, const char *to)
{
    krb5_error_code ret;
    krb5_keytab src_keytab, dst_keytab;
    krb5_kt_cursor cursor;
    krb5_keytab_entry entry, dummy;

    ret = krb5_kt_resolve (context, from, &src_keytab);
    if (ret) {
	krb5_warn (context, ret, "resolving src keytab `%s'", from);
	return 1;
    }

    ret = krb5_kt_resolve (context, to, &dst_keytab);
    if (ret) {
	krb5_kt_close (context, src_keytab);
	krb5_warn (context, ret, "resolving dst keytab `%s'", to);
	return 1;
    }

    ret = krb5_kt_start_seq_get (context, src_keytab, &cursor);
    if (ret) {
	krb5_warn (context, ret, "krb5_kt_start_seq_get %s", keytab_string);
	goto out;
    }

    if (verbose_flag)
	fprintf(stderr, "copying %s to %s\n", from, to);

    while((ret = krb5_kt_next_entry(context, src_keytab,
				    &entry, &cursor)) == 0) {
	char *name_str;
	char *etype_str;
	ret = krb5_unparse_name (context, entry.principal, &name_str);
	if(ret) {
	    krb5_warn(context, ret, "krb5_unparse_name");
	    name_str = NULL; /* XXX */
	}
	ret = krb5_enctype_to_string(context, entry.keyblock.keytype, &etype_str);
	if(ret) {
	    krb5_warn(context, ret, "krb5_enctype_to_string");
	    etype_str = NULL; /* XXX */
	}
	ret = krb5_kt_get_entry(context, dst_keytab, 
				entry.principal, 
				entry.vno, 
				entry.keyblock.keytype,
				&dummy);
	if(ret == 0) {
	    /* this entry is already in the new keytab, so no need to
               copy it; if the keyblocks are not the same, something
               is weird, so complain about that */
	    if(!compare_keyblock(&entry.keyblock, &dummy.keyblock)) {
		krb5_warnx(context, "entry with different keyvalue "
			   "already exists for %s, keytype %s, kvno %d", 
			   name_str, etype_str, entry.vno);
	    }
	    krb5_kt_free_entry(context, &dummy);
	    krb5_kt_free_entry (context, &entry);
	    free(name_str);
	    free(etype_str);
	    continue;
	} else if(ret != KRB5_KT_NOTFOUND) {
	    krb5_warn (context, ret, "%s: fetching %s/%s/%u", 
		       to, name_str, etype_str, entry.vno);
	    krb5_kt_free_entry (context, &entry);
	    free(name_str);
	    free(etype_str);
	    break;
	}
	if (verbose_flag)
	    fprintf (stderr, "copying %s, keytype %s, kvno %d\n", name_str, 
		     etype_str, entry.vno);
	ret = krb5_kt_add_entry (context, dst_keytab, &entry);
	krb5_kt_free_entry (context, &entry);
	if (ret) {
	    krb5_warn (context, ret, "%s: adding %s/%s/%u", 
		       to, name_str, etype_str, entry.vno);
	    free(name_str);
	    free(etype_str);
	    break;
	}
	free(name_str);
	free(etype_str);
    }
    krb5_kt_end_seq_get (context, src_keytab, &cursor);

  out:
    krb5_kt_close (context, src_keytab);
    krb5_kt_close (context, dst_keytab);
    return ret != 0;
}

int
kt_copy (void *opt, int argc, char **argv)
{
    return kt_copy_int(argv[0], argv[1]);
}

int
srvconv(struct srvconvert_options *opt, int argc, char **argv)
{
    char kt4[1024], kt5[1024];

    snprintf(kt4, sizeof(kt4), "krb4:%s", opt->srvtab_string);

    if(keytab_string != NULL)
	return kt_copy_int(kt4, keytab_string);

    krb5_kt_default_modify_name(context, kt5, sizeof(kt5));
    return kt_copy_int(kt4, kt5);
}

int
srvcreate(struct srvcreate_options *opt, int argc, char **argv)
{
    char kt4[1024], kt5[1024];

    snprintf(kt4, sizeof(kt4), "krb4:%s", opt->srvtab_string);

    if(keytab_string != NULL)
	return kt_copy_int(keytab_string, kt4);

    krb5_kt_default_name(context, kt5, sizeof(kt5));
    return kt_copy_int(kt5, kt4);
}
