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/*
 * Copyright (c) 2001-2002 Packet Design, LLC.
 * All rights reserved.
 * 
 * Subject to the following obligations and disclaimer of warranty,
 * use and redistribution of this software, in source or object code
 * forms, with or without modifications are expressly permitted by
 * Packet Design; provided, however, that:
 * 
 *    (i)  Any and all reproductions of the source or object code
 *         must include the copyright notice above and the following
 *         disclaimer of warranties; and
 *    (ii) No rights are granted, in any manner or form, to use
 *         Packet Design trademarks, including the mark "PACKET DESIGN"
 *         on advertising, endorsements, or otherwise except as such
 *         appears in the above copyright notice or in the software.
 * 
 * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
 * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
 * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
 * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
 * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
 * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
 * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
 * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
 * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
 * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 PACKET DESIGN IS ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Archie Cobbs <archie@freebsd.org>
 */

#include "ppp/ppp_defs.h"
#include "ppp/ppp_log.h"
#include "ppp/ppp_fsm_option.h"
#include "ppp/ppp_auth.h"
#include "ppp/ppp_auth_pap.h"
#include "ppp/ppp_auth_chap.h"

/***********************************************************************
			AUTH TYPE FUNCTIONS
***********************************************************************/

/* Types of CHAP */
#define CHAP_PROTO_MD5		0x05
#define CHAP_PROTO_MSV1		0x80
#define CHAP_PROTO_MSV2		0x81

#define PRBYT(x)	((PPP_PROTO_ ## x) >> 8), ((PPP_PROTO_ ## x) & 0xff)

/* Keep consistent with "ppp_auth.h" */
static const	struct ppp_auth_type ppp_auth_types[PPP_AUTH_MAX] = {
    {
	"None",
	PPP_AUTH_NONE,
	NULL,
	NULL,
	0
    },
    {
	"PAP",
	PPP_AUTH_PAP,
	ppp_auth_pap_start,
	ppp_auth_pap_cancel,
	ppp_auth_pap_input,
	2, { PRBYT(PAP) }
    },
    {
	"CHAP-MSv1",
	PPP_AUTH_CHAP_MSV1,
	ppp_auth_chap_start,
	ppp_auth_chap_cancel,
	ppp_auth_chap_input,
	3, { PRBYT(CHAP), CHAP_PROTO_MSV1 }
    },
    {
	"CHAP-MSv2",
	PPP_AUTH_CHAP_MSV2,
	ppp_auth_chap_start,
	ppp_auth_chap_cancel,
	ppp_auth_chap_input,
	3, { PRBYT(CHAP), CHAP_PROTO_MSV2 }
    },
    {
	"CHAP-MD5",
	PPP_AUTH_CHAP_MD5,
	ppp_auth_chap_start,
	ppp_auth_chap_cancel,
	ppp_auth_chap_input,
	3, { PRBYT(CHAP), CHAP_PROTO_MD5 }
    },
};

/*
 * Find auth type descriptor by LCP option.
 */
const struct ppp_auth_type *
ppp_auth_by_option(const struct ppp_fsm_option *opt)
{
	int i;

	for (i = 1; i < PPP_AUTH_MAX; i++) {
		const struct ppp_auth_type *const auth = &ppp_auth_types[i];

		if (auth->index != PPP_AUTH_NONE	/* saftey first! */
		    && opt->len == auth->len
		    && memcmp(opt->data, auth->data, auth->len) == 0)
			return (auth);
	}
	return (NULL);
}

/*
 * Find auth type descriptor by index.
 */
const struct ppp_auth_type *
ppp_auth_by_index(enum ppp_auth_index index)
{
	if (index <= 0 || index > PPP_AUTH_MAX) {
		errno = EINVAL;
		return (NULL);
	}
	return (&ppp_auth_types[index]);
}

/*
 * Print out an auth type option.
 */
void
ppp_auth_print(const struct ppp_fsm_optdesc *desc,
	const struct ppp_fsm_option *opt, char *buf, size_t bmax)
{
	const struct ppp_auth_type *const auth = ppp_auth_by_option(opt);

	if (auth != NULL) {
		snprintf(buf, bmax, "%s", auth->name);
		return;
	}
	if (opt->len < 2) {
		snprintf(buf, bmax, "<truncated>");
		return;
	}
	snprintf(buf, bmax, "?0x%02x%02x", opt->data[0], opt->data[1]);
}