/*
 * Copyright (c) 1997 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. All advertising materials mentioning features or use of this software 
 *    must display the following acknowledgement: 
 *      This product includes software developed by Kungliga Tekniska 
 *      Högskolan and its contributors. 
 *
 * 4. 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 "test_locl.h"
#include <gssapi.h>
RCSID("$Id$");

static void
usage (void)
{
    errx (1, "Usage: %s [-p port] [-s service] host", __progname);
}

static int
proto (int sock, const char *hostname, const char *service)
{
    struct sockaddr_in remote, local;
    int addrlen;

    int context_established = 0;
    gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT;
    gss_buffer_t input_token, output_token;
    gss_buffer_desc real_input_token, real_output_token;
    OM_uint32 maj_stat, min_stat;
    u_int32_t len, net_len;
    gss_name_t server;
    gss_buffer_desc name_token;
    char *n;

    name_token.length = asprintf ((char **)&name_token.value,
				  "%s@%s", service, hostname);

    maj_stat = gss_import_name (&min_stat,
				&name_token,
				GSS_C_NT_HOSTBASED_SERVICE,
				&server);
    if (GSS_ERROR(maj_stat))
	abort ();

    addrlen = sizeof(local);
    if (getsockname (sock, (struct sockaddr *)&local, &addrlen) < 0
	|| addrlen != sizeof(local))
	err (1, "getsockname(%s)", hostname);

    addrlen = sizeof(remote);
    if (getpeername (sock, (struct sockaddr *)&remote, &addrlen) < 0
	|| addrlen != sizeof(remote))
	err (1, "getpeername(%s)", hostname);

    input_token = &real_input_token;
    output_token = &real_output_token;

    input_token->length = 0;
    output_token->length = 0;

    while(!context_established) {
	maj_stat =
	    gss_init_sec_context(&min_stat,
				 GSS_C_NO_CREDENTIAL,
				 &context_hdl,
				 server,
				 GSS_C_NO_OID,
				 GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
				 0,
				 GSS_C_NO_CHANNEL_BINDINGS,
				 input_token,
				 NULL,
				 output_token,
				 NULL,
				 NULL);
	if (GSS_ERROR(maj_stat))
	    abort ();
	if (output_token->length != 0)
	    write_token (sock, output_token);
	if (GSS_ERROR(maj_stat)) {
	    if (context_hdl != GSS_C_NO_CONTEXT)
		gss_delete_sec_context (&min_stat,
					&context_hdl,
					GSS_C_NO_BUFFER);
	    break;
	}
	if (maj_stat & GSS_S_CONTINUE_NEEDED) {
	    read_token (sock, input_token);
	} else {
	    context_established = 1;
	}

    }

    /* get_mic */

    input_token->length = 3;
    input_token->value  = strdup("hej");

    maj_stat = gss_get_mic(&min_stat,
			   context_hdl,
			   GSS_C_QOP_DEFAULT,
			   input_token,
			   output_token);
    if (GSS_ERROR(maj_stat))
	abort ();

    write_token (sock, input_token);
    write_token (sock, output_token);

    /* wrap */

    input_token->length = 7;
    input_token->value  = "hemligt";


    maj_stat = gss_wrap (&min_stat,
			 context_hdl,
			 1,
			 GSS_C_QOP_DEFAULT,
			 input_token,
			 NULL,
			 output_token);
    if (GSS_ERROR(maj_stat))
	abort ();

    write_token (sock, output_token);

    return 0;
}

static int
doit (const char *hostname, int port, const char *service)
{
    struct in_addr **h;
    struct hostent *hostent;

    hostent = gethostbyname (hostname);
    if (hostent == NULL)
	errx (1, "gethostbyname '%s' failed: %s",
	      hostname,
	      hstrerror(h_errno));

    for (h = (struct in_addr **)hostent->h_addr_list;
	*h != NULL;
	 ++h) {
	struct sockaddr_in addr;
	int s;

	memset (&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_port   = port;
	addr.sin_addr   = **h;

	s = socket (AF_INET, SOCK_STREAM, 0);
	if (s < 0)
	    err (1, "socket");
	if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
	    warn ("connect(%s)", hostname);
	    close (s);
	    continue;
	}
	return proto (s, hostname, service);
    }
    return 1;
}

int
main(int argc, char **argv)
{
    int c;
    int port = 0;
    char *service = SERVICE;

    set_progname (argv[0]);

    while ((c = getopt (argc, argv, "p:s:")) != EOF) {
	switch (c) {
	case 'p': {
	    struct servent *s = getservbyname (optarg, "tcp");

	    if (s)
		port = s->s_port;
	    else {
		char *ptr;

		port = strtol (optarg, &ptr, 10);
		if (port == 0 && ptr == optarg)
		    errx (1, "Bad port `%s'", optarg);
		port = htons(port);
	    }
	    break;
	}
	case 's':
	    service = optarg;
	    break;
	default:
	    usage ();
	    break;
	}
    }
    argc -= optind;
    argv += optind;

    if (argc != 1)
	usage ();

    if (port == 0)
	port = krb5_getportbyname (PORT, "tcp", htons(4711));

    return doit (*argv, port, service);
}