/*      $OpenBSD: ifstated.h,v 1.19 2017/08/20 17:49:29 rob Exp $       */

/*
 * Copyright (c) 2004 Ryan McBride
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR OR HIS RELATIVES 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 MIND, 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 <sys/types.h>
#include <sys/queue.h>

struct ifsd_expression;
TAILQ_HEAD(ifsd_expression_list, ifsd_expression);

struct ifsd_ifstate {
        TAILQ_ENTRY(ifsd_ifstate)        entries;
        struct ifsd_expression_list      expressions;
        int                              ifstate;
#define IFSD_LINKUNKNOWN        0
#define IFSD_LINKDOWN           1
#define IFSD_LINKUP             2
        int                              prevstate;
        u_int32_t                        refcount;
        char                             ifname[IFNAMSIZ];
};

struct ifsd_external {
        TAILQ_ENTRY(ifsd_external)       entries;
        struct event                     ev;
        struct ifsd_expression_list      expressions;
        char                            *command;
        int                              prevstatus;
        u_int32_t                        frequency;
        u_int32_t                        refcount;
        time_t                           lastexec;
        pid_t                            pid;
};

struct ifsd_action;
TAILQ_HEAD(ifsd_action_list, ifsd_action);

struct ifsd_action {
        TAILQ_ENTRY(ifsd_action)         entries;
        struct ifsd_action              *parent;
        union {
                char                    *command;
                struct ifsd_state       *nextstate;
                char                    *statename;
                struct {
                        struct ifsd_action_list  actions;
                        struct ifsd_expression  *expression;
                } c;
        } act;
        u_int32_t                        type;
#define IFSD_ACTION_COMMAND             1
#define IFSD_ACTION_CHANGESTATE         2
#define IFSD_ACTION_CONDITION           3
};

struct ifsd_expression {
        TAILQ_ENTRY(ifsd_expression)     entries;
        TAILQ_ENTRY(ifsd_expression)     eval;
        struct ifsd_expression          *parent;
        struct ifsd_action              *action;
        struct ifsd_expression          *left;
        struct ifsd_expression          *right;
        union {
                struct ifsd_ifstate             *ifstate;
                struct ifsd_external            *external;
        } u;
        int                              depth;
        u_int32_t                        type;
#define IFSD_OPER_AND           1
#define IFSD_OPER_OR            2
#define IFSD_OPER_NOT           3
#define IFSD_OPER_EXTERNAL      4
#define IFSD_OPER_IFSTATE       5
        u_int8_t                         truth;
};

TAILQ_HEAD(ifsd_ifstate_list, ifsd_ifstate);
TAILQ_HEAD(ifsd_external_list, ifsd_external);

struct ifsd_state {
        struct event                     ev;
        struct ifsd_ifstate_list         interface_states;
        struct ifsd_external_list        external_tests;
        TAILQ_ENTRY(ifsd_state)          entries;
        struct ifsd_action              *init;
        struct ifsd_action              *body;
        time_t                           entered;
        char                            *name;
};

TAILQ_HEAD(ifsd_state_list, ifsd_state);

struct ifsd_config {
        struct ifsd_state                initstate;
        struct ifsd_state_list           states;
        struct ifsd_state               *curstate;
        struct ifsd_state               *nextstate;
        u_int32_t                        opts;
#define IFSD_OPT_VERBOSE        0x00000001
#define IFSD_OPT_VERBOSE2       0x00000002
#define IFSD_OPT_NOACTION       0x00000004
        int                              maxdepth;
};

enum    { IFSD_EVTIMER_ADD, IFSD_EVTIMER_DEL };
struct ifsd_config *parse_config(char *, int);
int     cmdline_symset(char *);
void    clear_config(struct ifsd_config *);