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/*
* Copyright (c) 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*/
#include "hx_locl.h"
struct hx_expr *
_hx509_make_expr(enum hx_expr_op op, void *arg1, void *arg2)
{
struct hx_expr *expr;
expr = malloc(sizeof(*expr));
if (expr == NULL)
return NULL;
expr->op = op;
expr->arg1 = arg1;
expr->arg2 = arg2;
return expr;
}
static const char *
eval_word(hx509_context context, hx509_env env, struct hx_expr *word)
{
switch (word->op) {
case expr_STRING:
return word->arg1;
case expr_VAR:
if (word->arg2 == NULL)
return hx509_env_find(context, env, word->arg1);
env = hx509_env_find_binding(context, env, word->arg1);
if (env == NULL)
return NULL;
return eval_word(context, env, word->arg2);
default:
return NULL;
}
}
static hx509_env
find_variable(hx509_context context, hx509_env env, struct hx_expr *word)
{
assert(word->op == expr_VAR);
if (word->arg2 == NULL)
return hx509_env_find_binding(context, env, word->arg1);
env = hx509_env_find_binding(context, env, word->arg1);
if (env == NULL)
return NULL;
return find_variable(context, env, word->arg2);
}
static int
eval_comp(hx509_context context, hx509_env env, struct hx_expr *expr)
{
switch (expr->op) {
case comp_NE:
case comp_EQ:
case comp_TAILEQ: {
const char *s1, *s2;
int ret;
s1 = eval_word(context, env, expr->arg1);
s2 = eval_word(context, env, expr->arg2);
if (s1 == NULL || s2 == NULL)
return FALSE;
if (expr->op == comp_TAILEQ) {
size_t len1 = strlen(s1);
size_t len2 = strlen(s2);
if (len1 < len2)
return 0;
ret = strcmp(s1 + (len1 - len2), s2) == 0;
} else {
ret = strcmp(s1, s2) == 0;
if (expr->op == comp_NE)
ret = !ret;
}
return ret;
}
case comp_IN: {
struct hx_expr *subexpr;
const char *w, *s1;
w = eval_word(context, env, expr->arg1);
subexpr = expr->arg2;
if (subexpr->op == expr_WORDS) {
while (subexpr) {
s1 = eval_word(context, env, subexpr->arg1);
if (strcmp(w, s1) == 0)
return TRUE;
subexpr = subexpr->arg2;
}
} else if (subexpr->op == expr_VAR) {
hx509_env subenv;
subenv = find_variable(context, env, subexpr);
if (subenv == NULL)
return FALSE;
while (subenv) {
if (subenv->type != env_string)
continue;
if (strcmp(w, subenv->name) == 0)
return TRUE;
if (strcmp(w, subenv->u.string) == 0)
return TRUE;
subenv = subenv->next;
}
} else
_hx509_abort("hx509 eval IN unknown op: %d", (int)subexpr->op);
return FALSE;
}
default:
_hx509_abort("hx509 eval expr with unknown op: %d", (int)expr->op);
}
return FALSE;
}
int
_hx509_expr_eval(hx509_context context, hx509_env env, struct hx_expr *expr)
{
switch (expr->op) {
case op_TRUE:
return 1;
case op_FALSE:
return 0;
case op_NOT:
return ! _hx509_expr_eval(context, env, expr->arg1);
case op_AND:
return _hx509_expr_eval(context, env, expr->arg1) &&
_hx509_expr_eval(context, env, expr->arg2);
case op_OR:
return _hx509_expr_eval(context, env, expr->arg1) ||
_hx509_expr_eval(context, env, expr->arg2);
case op_COMP:
return eval_comp(context, env, expr->arg1);
default:
_hx509_abort("hx509 eval expr with unknown op: %d", (int)expr->op);
}
}
void
_hx509_expr_free(struct hx_expr *expr)
{
switch (expr->op) {
case expr_STRING:
case expr_NUMBER:
free(expr->arg1);
break;
case expr_WORDS:
case expr_FUNCTION:
case expr_VAR:
free(expr->arg1);
if (expr->arg2)
_hx509_expr_free(expr->arg2);
break;
default:
if (expr->arg1)
_hx509_expr_free(expr->arg1);
if (expr->arg2)
_hx509_expr_free(expr->arg2);
break;
}
free(expr);
}
struct hx_expr *
_hx509_expr_parse(const char *buf)
{
_hx509_expr_input.buf = buf;
_hx509_expr_input.length = strlen(buf);
_hx509_expr_input.offset = 0;
_hx509_expr_input.expr = NULL;
if (_hx509_expr_input.error) {
free(_hx509_expr_input.error);
_hx509_expr_input.error = NULL;
}
yyparse();
return _hx509_expr_input.expr;
}
void
_hx509_sel_yyerror (char *s)
{
if (_hx509_expr_input.error)
free(_hx509_expr_input.error);
_hx509_expr_input.error = strdup(s);
}
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