/*
 * Copyright (c) 1997 - 2000 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 "test_locl.h"
#include <gssapi.h>
#include "gss_common.h"
RCSID("$Id: gss_common.c 19937 2007-01-16 21:56:01Z lha $");

void
write_token (int sock, gss_buffer_t buf)
{
    uint32_t len, net_len;
    OM_uint32 min_stat;

    len = buf->length;

    net_len = htonl(len);

    if (net_write (sock, &net_len, 4) != 4)
	err (1, "write");
    if (net_write (sock, buf->value, len) != len)
	err (1, "write");

    gss_release_buffer (&min_stat, buf);
}

static void
enet_read(int fd, void *buf, size_t len)
{
    ssize_t ret;

    ret = net_read (fd, buf, len);
    if (ret == 0)
	errx (1, "EOF in read");
    else if (ret < 0)
	errx (1, "read");
}

void
read_token (int sock, gss_buffer_t buf)
{
    uint32_t len, net_len;

    enet_read (sock, &net_len, 4);
    len = ntohl(net_len);
    buf->length = len;
    buf->value  = emalloc(len);
    enet_read (sock, buf->value, len);
}

void
gss_print_errors (int min_stat)
{
    OM_uint32 new_stat;
    OM_uint32 msg_ctx = 0;
    gss_buffer_desc status_string;
    OM_uint32 ret;

    do {
	ret = gss_display_status (&new_stat,
				  min_stat,
				  GSS_C_MECH_CODE,
				  GSS_C_NO_OID,
				  &msg_ctx,
				  &status_string);
	fprintf (stderr, "%.*s\n", (int)status_string.length, 
		 (char *)status_string.value);
	gss_release_buffer (&new_stat, &status_string);
    } while (!GSS_ERROR(ret) && msg_ctx != 0);
}

void
gss_verr(int exitval, int status, const char *fmt, va_list ap)
{
    vwarnx (fmt, ap);
    gss_print_errors (status);
    exit (exitval);
}

void
gss_err(int exitval, int status, const char *fmt, ...)
{
    va_list args;

    va_start(args, fmt);
    gss_verr (exitval, status, fmt, args);
    va_end(args);
}

gss_OID
select_mech(const char *mech)
{
    if (strcasecmp(mech, "krb5") == 0)
	return GSS_KRB5_MECHANISM;
    else if (strcasecmp(mech, "spnego") == 0)
	return GSS_SPNEGO_MECHANISM;
    else if (strcasecmp(mech, "no-oid") == 0)
	return GSS_C_NO_OID;
    else
	errx (1, "Unknown mechanism '%s' (spnego, krb5, no-oid)", mech);
}

void
print_gss_name(const char *prefix, gss_name_t name)
{
    OM_uint32 maj_stat, min_stat;
    gss_buffer_desc name_token;

    maj_stat = gss_display_name (&min_stat,
				 name,
				 &name_token,
				 NULL);
    if (GSS_ERROR(maj_stat))
	gss_err (1, min_stat, "gss_display_name");

    fprintf (stderr, "%s `%.*s'\n", prefix,
	     (int)name_token.length,
	     (char *)name_token.value);

    gss_release_buffer (&min_stat, &name_token);

}
