/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_INCLUDE_SNMP_PDU_H
#define SQUID_INCLUDE_SNMP_PDU_H

/* required for oid typedef */
#include "asn1.h"

#if HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

/**********************************************************************
 *
 *           Copyright 1997 by Carnegie Mellon University
 *
 *                       All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of CMU not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.
 *
 * CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
 * CMU BE LIABLE FOR ANY SPECIAL, 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.
 *
 * Author: Ryan Troll <ryan+@andrew.cmu.edu>
 *
 **********************************************************************/

#ifdef __cplusplus
extern "C" {
#endif

/* An SNMP PDU */
struct snmp_pdu {
    int command;        /* Type of this PDU */
    struct sockaddr_in address;     /* Address of peer */

    int reqid;          /* Integer32: Request id */
    int errstat;        /* INTEGER:   Error status */
    int errindex;       /* INTEGER:   Error index */

    /* SNMPv2 Bulk Request */
    int non_repeaters;      /* INTEGER: */
    int max_repetitions;    /* INTEGER: */

    struct variable_list *variables;    /* Variable Bindings */

    /* Trap information */
    oid *enterprise;        /* System OID */
    int enterprise_length;
    struct sockaddr_in agent_addr;      /* address of object generating trap */
    int trap_type;      /* generic trap type */
    int specific_type;      /* specific type */
    u_int time;         /* Uptime */
};

struct snmp_pdu *snmp_pdu_create(int);
struct snmp_pdu *snmp_pdu_clone(struct snmp_pdu *);
struct snmp_pdu *snmp_pdu_fix(struct snmp_pdu *, int);
struct snmp_pdu *snmp_fix_pdu(struct snmp_pdu *, int);
void snmp_free_pdu(struct snmp_pdu *);
void snmp_pdu_free(struct snmp_pdu *);

u_char *snmp_pdu_encode(u_char *, int *, struct snmp_pdu *);
u_char *snmp_pdu_decode(u_char *, int *, struct snmp_pdu *);

/* Add a NULL Variable to a PDU */
void snmp_add_null_var(struct snmp_pdu *, oid *, int);

/* RFC 1905: Protocol Operations for SNMPv2
 *
 * RFC 1157: A Simple Network Management Protocol (SNMP)
 *
 * PDU Types
 */
#define SNMP_PDU_GET        (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x0)
#define SNMP_PDU_GETNEXT    (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x1)
#define SNMP_PDU_RESPONSE   (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x2)
#define SNMP_PDU_GETBULK    (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x5)
#define MAX_BINDINGS 2147483647 /* PDU Defaults */
#define SNMP_DEFAULT_ERRSTAT        -1
#define SNMP_DEFAULT_ERRINDEX       -1
#define SNMP_DEFAULT_ADDRESS        0
#define SNMP_DEFAULT_REQID      0

#ifdef __cplusplus
}
#endif

#endif /* SQUID_INCLUDE_SNMP_PDU_H */