/*-
* Copyright (c) 2011-2025 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* NPF variables are used to build the intermediate representation (IR)
* of the configuration grammar.  They represent primitive types (strings,
* numbers, etc) as well as complex types (address and mask, table, etc).
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: npf_var.c,v 1.15 2025/06/01 00:54:36 joe Exp $");

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define _NPFVAR_PRIVATE
#include "npfctl.h"

typedef struct npf_element {
       void *          e_data;
       unsigned        e_type;
       struct npf_element *e_next;
} npf_element_t;

struct npfvar {
       char *          v_key;
       npf_element_t * v_elements;
       npf_element_t * v_last;
       size_t          v_count;
       void *          v_next;
};

static npfvar_t *       var_list = NULL;
static size_t           var_num = 0;

npfvar_t *
npfvar_create(void)
{
       npfvar_t *vp = ecalloc(1, sizeof(*vp));
       var_num++;
       return vp;
}

npfvar_t *
npfvar_lookup(const char *key)
{
       for (npfvar_t *it = var_list; it != NULL; it = it->v_next)
               if (strcmp(it->v_key, key) == 0)
                       return it;
       return NULL;
}

const char *
npfvar_type(size_t t)
{
       if (t >= __arraycount(npfvar_types)) {
               return "unknown";
       }
       return npfvar_types[t];
}

void
npfvar_add(npfvar_t *vp, const char *name)
{
       vp->v_key = estrdup(name);
       vp->v_next = var_list;
       var_list = vp;
}

npfvar_t *
npfvar_create_element(unsigned type, const void *data, size_t len)
{
       npfvar_t *vp = npfvar_create();
       return npfvar_add_element(vp, type, data, len);
}

npfvar_t *
npfvar_create_from_string(unsigned type, const char *string)
{
       return npfvar_create_element(type, string, strlen(string) + 1);
}

npfvar_t *
npfvar_add_element(npfvar_t *vp, unsigned type, const void *data, size_t len)
{
       npf_element_t *el;

       el = ecalloc(1, sizeof(*el));
       el->e_data = ecalloc(1, len);
       el->e_type = type;
       memcpy(el->e_data, data, len);

       /* Preserve the order of insertion. */
       if (vp->v_elements == NULL) {
               vp->v_elements = el;
       } else {
               vp->v_last->e_next = el;
       }
       vp->v_last = el;
       vp->v_count++;
       return vp;
}

npfvar_t *
npfvar_add_elements(npfvar_t *vp, npfvar_t *vp2)
{
       if (vp2 == NULL)
               return vp;
       if (vp == NULL)
               return vp2;

       if (vp->v_elements == NULL) {
               if (vp2->v_elements) {
                       vp->v_elements = vp2->v_elements;
               }
       } else if (vp2->v_elements) {
               vp->v_last->e_next = vp2->v_elements;
       }
       if (vp2->v_elements) {
               vp->v_last = vp2->v_last;
               vp->v_count += vp2->v_count;
               vp2->v_elements = NULL;
               vp2->v_count = 0;
               vp2->v_last = NULL;
       }
       npfvar_destroy(vp2);
       return vp;
}

static void
npfvar_free_elements(npf_element_t *el)
{
       if (el == NULL)
               return;
       npfvar_free_elements(el->e_next);
       free(el->e_data);
       free(el);
}

void
npfvar_destroy(npfvar_t *vp)
{
       npfvar_free_elements(vp->v_elements);
       free(vp->v_key);
       free(vp);
       var_num--;
}

char *
npfvar_expand_string(const npfvar_t *vp)
{
       if (npfvar_get_count(vp) != 1) {
               yyerror("variable '%s' has multiple elements", vp->v_key);
               return NULL;
       }
       return npfvar_get_data(vp, NPFVAR_STRING, 0);
}

uint32_t
npfvar_expand_number(const npfvar_t *vp)
{
       uint32_t *number;
       if (npfvar_get_count(vp) != 1) {
               yyerror("variable '%s' has multiple elements", vp->v_key);
       }
       number =  (uint32_t *)npfvar_get_data(vp, NPFVAR_NUM, 0);
       return *number;
}

void
npf_var_rid(char *var_id, rid_parser parser, uint32_t *rid, const char *ridt)
{
       npfvar_t *vp = npfvar_lookup(var_id);
       int type = npfvar_get_type(vp, 0);
       char *rid_type;

       switch (type) {
       case NPFVAR_IDENTIFIER:
       case NPFVAR_STRING:
               rid_type = npfvar_expand_string(vp);
               if (parser(rid_type, rid) == -1) {
                       yyerror("unknown %s %s", var_id, ridt);
               }
               break;
       case NPFVAR_NUM:
               *rid = npfvar_expand_number(vp);
               break;
       case -1:
               yyerror("undefined variable '%s'", var_id);
               break;
       default:
               yyerror("wrong variable '%s' type '%s' for %s id",
                       var_id, npfvar_type(type), ridt);
               break;
       }
}

size_t
npfvar_get_count(const npfvar_t *vp)
{
       return vp ? vp->v_count : 0;
}

static npf_element_t *
npfvar_get_element(const npfvar_t *vp, size_t idx, size_t level)
{
       npf_element_t *el;

       /*
        * Verify the parameters.
        */
       if (vp == NULL) {
               return NULL;
       }
       if (level >= var_num) {
               yyerror("circular dependency for variable '%s'", vp->v_key);
               return NULL;
       }
       if (vp->v_count <= idx) {
               yyerror("variable '%s' has only %zu elements, requested %zu",
                   vp->v_key, vp->v_count, idx);
               return NULL;
       }

       /*
        * Get the element at the given index.
        */
       el = vp->v_elements;
       while (idx--) {
               el = el->e_next;
       }

       /*
        * Resolve if it is a reference to another variable.
        */
       if (el->e_type == NPFVAR_VAR_ID) {
               const npfvar_t *rvp = npfvar_lookup(el->e_data);
               return npfvar_get_element(rvp, 0, level + 1);
       }
       return el;
}

int
npfvar_get_type(const npfvar_t *vp, size_t idx)
{
       npf_element_t *el = npfvar_get_element(vp, idx, 0);
       return el ? (int)el->e_type : -1;
}

void *
npfvar_get_data(const npfvar_t *vp, unsigned type, size_t idx)
{
       npf_element_t *el = npfvar_get_element(vp, idx, 0);

       if (el && NPFVAR_TYPE(el->e_type) != NPFVAR_TYPE(type)) {
               yyerror("variable '%s' element %zu "
                   "is of type '%s' rather than '%s'", vp->v_key,
                   idx, npfvar_type(el->e_type), npfvar_type(type));
               return NULL;
       }
       return el->e_data;
}

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