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Implement displaying SMI enums as text.
For now limit to TruthValue implemented on ifPromiscuousMode and
ifConnectorPresent.

OK jan@

/*	$OpenBSD: smi.h,v 1.4 2020/12/14 07:44:26 martijn Exp $	*/

/*
 * Copyright (c) 2019 Martijn van Duren <martijn@openbsd.org>
 * Copyright (c) 2007, 2008 Reyk Floeter <reyk@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/tree.h>
#include <sys/queue.h>

#define OID_ROOT		0x00
#define OID_RD			0x01
#define OID_WR			0x02
#define OID_IFSET		0x04	/* only if user-specified value */
#define OID_DYNAMIC		0x08	/* free allocated data */
#define OID_TABLE		0x10	/* dynamic sub-elements */
#define OID_MIB			0x20	/* root-OID of a supported MIB */
#define OID_KEY			0x40	/* lookup tables */
#define	OID_REGISTERED		0x80	/* OID registered by subagent */

#define OID_RS			(OID_RD|OID_IFSET)
#define OID_WS			(OID_WR|OID_IFSET)
#define OID_RW			(OID_RD|OID_WR)
#define OID_RWS			(OID_RW|OID_IFSET)

#define OID_TRD			(OID_RD|OID_TABLE)
#define OID_TWR			(OID_WR|OID_TABLE)
#define OID_TRS			(OID_RD|OID_IFSET|OID_TABLE)
#define OID_TWS			(OID_WR|OID_IFSET|OID_TABLE)
#define OID_TRW			(OID_RD|OID_WR|OID_TABLE)
#define OID_TRWS		(OID_RW|OID_IFSET|OID_TABLE)

enum smi_output_string {
	smi_os_default,
	smi_os_hex,
	smi_os_ascii
};

enum smi_oid_lookup {
	smi_oidl_numeric,
	smi_oidl_short,
	smi_oidl_full
};

struct oid {
	struct ber_oid		 o_id;
#define o_oid			 o_id.bo_id
#define o_oidlen		 o_id.bo_n

	const char		*o_name;
	const char		*o_tcname;
	struct textconv		*o_textconv;

	RB_ENTRY(oid)		 o_element;
	RB_ENTRY(oid)		 o_keyword;
};

struct textconv_enum {
	uint32_t		 tce_number;
	const char		*tce_name;
};

struct textconv {
	const char		*tc_name;
	unsigned int		 tc_syntax;
	const char		*tc_display_hint;
	struct textconv_enum	*tc_enum;
	RB_ENTRY(textconv)	 tc_entry;
};

int smi_init(void);
unsigned int smi_application(struct ber_element *);
int smi_string2oid(const char *, struct ber_oid *);
char *smi_oid2string(struct ber_oid *, char *, size_t, enum smi_oid_lookup);
void smi_mibtree(struct oid *);
void smi_textconvtree(struct textconv *);
struct oid *smi_foreach(struct oid *);
void smi_debug_elements(struct ber_element *, int);
char *smi_print_element(struct ber_oid *, struct ber_element *, int,
    enum smi_output_string, enum smi_oid_lookup, int);