/*	$NetBSD: idn-lookup.c,v 1.2.22.1 2023/08/11 13:40:02 martin Exp $	*/

/*
 * Copyright (c) 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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <krb5/getarg.h>
#include <krb5/roken.h>

#include "windlocl.h"

static int version_flag = 0;
static int help_flag	= 0;


static int
is_separator(uint32_t u)
{
    return u == 0x002E || u == 0x3002;
}

static void
lookup(const char *name)
{
    unsigned i;
    char encoded[1024];
    char *ep;
    int ret;
    struct addrinfo hints;
    struct addrinfo *ai;

    size_t u_len = strlen(name);
    uint32_t *u = malloc(u_len * sizeof(uint32_t));
    size_t norm_len = u_len * 2;
    uint32_t *norm = malloc(norm_len * sizeof(uint32_t));

    if (u == NULL && u_len != 0)
	errx(1, "malloc failed");
    if (norm == NULL && norm_len != 0)
	errx(1, "malloc failed");

    ret = wind_utf8ucs4(name, u, &u_len);
    if (ret)
	errx(1, "utf8 conversion failed");
    ret = wind_stringprep(u, u_len, norm, &norm_len, WIND_PROFILE_NAME);
    if (ret)
	errx(1, "stringprep failed");
    free(u);

    ep = encoded;
    for (i = 0; i < norm_len; ++i) {
	unsigned j;
	size_t len;

	for (j = i; j < norm_len && !is_separator(norm[j]); ++j)
	    ;
	len = sizeof(encoded) - (ep - encoded);
	ret = wind_punycode_label_toascii(norm + i, j - i, ep, &len);
	if (ret)
	    errx(1, "punycode failed");

	ep += len;
	*ep++ = '.';
	i = j;
    }
    *ep = '\0';
    free(norm);

    printf("Converted \"%s\" into \"%s\"\n", name, encoded);

    memset(&hints, 0, sizeof(hints));
    hints.ai_flags = AI_CANONNAME;
    ret = getaddrinfo(encoded, NULL, &hints, &ai);
    if(ret)
	errx(1, "getaddrinfo failed: %s", gai_strerror(ret));
    printf("canonical-name: %s\n", ai->ai_canonname);
    freeaddrinfo(ai);
}

static struct getargs args[] = {
    {"version",	0,	arg_flag,	&version_flag,
     "print version", NULL },
    {"help",	0,	arg_flag,	&help_flag,
     NULL, NULL }
};

static void
usage (int ret)
{
    arg_printusage(args, sizeof(args)/sizeof(args[0]), NULL,
		   "dns-names ...");
    exit (ret);
}

int
main(int argc, char **argv)
{
    int optidx = 0;
    unsigned i;

    setprogname (argv[0]);

    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
	usage(1);

    if (help_flag)
	usage (0);

    if(version_flag){
	print_version(NULL);
	exit(0);
    }

    argc -= optidx;
    argv += optidx;

    if (argc == 0)
	usage(1);

    for (i = 0; i < argc; ++i) {
        if (argv[i][0]) /* Quiet lint */
            lookup(argv[i]);
    }
    return 0;
}
