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/* _ _
** _ __ ___ ___ __| | ___ ___| | mod_ssl
** | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
** | | | | | | (_) | (_| | \__ \__ \ | www.modssl.org
** |_| |_| |_|\___/ \__,_|___|___/___/_| ftp.modssl.org
** |_____|
** ssl_expr_eval.c
** Expression Evaluation
*/
/* ====================================================================
* Copyright (c) 1998-2003 Ralf S. Engelschall. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by
* Ralf S. Engelschall <rse@engelschall.com> for use in the
* mod_ssl project (http://www.modssl.org/)."
*
* 4. The names "mod_ssl" must not be used to endorse or promote
* products derived from this software without prior written
* permission. For written permission, please contact
* rse@engelschall.com.
*
* 5. Products derived from this software may not be called "mod_ssl"
* nor may "mod_ssl" appear in their names without prior
* written permission of Ralf S. Engelschall.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by
* Ralf S. Engelschall <rse@engelschall.com> for use in the
* mod_ssl project (http://www.modssl.org/)."
*
* THIS SOFTWARE IS PROVIDED BY RALF S. ENGELSCHALL ``AS IS'' AND ANY
* EXPRESSED 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 RALF S. ENGELSCHALL OR
* HIS 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.
* ====================================================================
*/
/* ``Make love,
not software!''
-- Unknown */
#include "mod_ssl.h"
/* _________________________________________________________________
**
** Expression Evaluation
** _________________________________________________________________
*/
static BOOL ssl_expr_eval_comp(request_rec *, ssl_expr *);
static char *ssl_expr_eval_word(request_rec *, ssl_expr *);
static char *ssl_expr_eval_func_file(request_rec *, char *);
static int ssl_expr_eval_strcmplex(char *, char *);
BOOL ssl_expr_eval(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_True: {
return TRUE;
}
case op_False: {
return FALSE;
}
case op_Not: {
ssl_expr *e = (ssl_expr *)node->node_arg1;
return (!ssl_expr_eval(r, e));
}
case op_Or: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval(r, e1) || ssl_expr_eval(r, e2));
}
case op_And: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval(r, e1) && ssl_expr_eval(r, e2));
}
case op_Comp: {
ssl_expr *e = (ssl_expr *)node->node_arg1;
return ssl_expr_eval_comp(r, e);
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static BOOL ssl_expr_eval_comp(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_EQ: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (strcmp(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) == 0);
}
case op_NE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (strcmp(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) != 0);
}
case op_LT: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) < 0);
}
case op_LE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) <= 0);
}
case op_GT: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) > 0);
}
case op_GE: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
return (ssl_expr_eval_strcmplex(ssl_expr_eval_word(r, e1), ssl_expr_eval_word(r, e2)) >= 0);
}
case op_IN: {
ssl_expr *e1 = (ssl_expr *)node->node_arg1;
ssl_expr *e2 = (ssl_expr *)node->node_arg2;
ssl_expr *e3;
char *w1 = ssl_expr_eval_word(r, e1);
BOOL found = FALSE;
do {
e3 = (ssl_expr *)e2->node_arg1;
e2 = (ssl_expr *)e2->node_arg2;
if (strcmp(w1, ssl_expr_eval_word(r, e3)) == 0) {
found = TRUE;
break;
}
} while (e2 != NULL);
return found;
}
case op_REG: {
ssl_expr *e1;
ssl_expr *e2;
char *word;
regex_t *regex;
e1 = (ssl_expr *)node->node_arg1;
e2 = (ssl_expr *)node->node_arg2;
word = ssl_expr_eval_word(r, e1);
regex = (regex_t *)(e2->node_arg1);
return (regexec(regex, word, 0, NULL, 0) == 0);
}
case op_NRE: {
ssl_expr *e1;
ssl_expr *e2;
char *word;
regex_t *regex;
e1 = (ssl_expr *)node->node_arg1;
e2 = (ssl_expr *)node->node_arg2;
word = ssl_expr_eval_word(r, e1);
regex = (regex_t *)(e2->node_arg1);
return !(regexec(regex, word, 0, NULL, 0) == 0);
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static char *ssl_expr_eval_word(request_rec *r, ssl_expr *node)
{
switch (node->node_op) {
case op_Digit: {
char *string = (char *)node->node_arg1;
return string;
}
case op_String: {
char *string = (char *)node->node_arg1;
return string;
}
case op_Var: {
char *var = (char *)node->node_arg1;
char *val = ssl_var_lookup(r->pool, r->server, r->connection, r, var);
return (val == NULL ? "" : val);
}
case op_Func: {
char *name = (char *)node->node_arg1;
ssl_expr *args = (ssl_expr *)node->node_arg2;
if (strEQ(name, "file"))
return ssl_expr_eval_func_file(r, (char *)(args->node_arg1));
else {
ssl_expr_error = "Internal evaluation error: Unknown function name";
return "";
}
}
default: {
ssl_expr_error = "Internal evaluation error: Unknown expression node";
return FALSE;
}
}
}
static char *ssl_expr_eval_func_file(request_rec *r, char *filename)
{
FILE *fp;
char *buf;
int len;
if ((fp = ap_pfopen(r->pool, filename, "r")) == NULL) {
ssl_expr_error = "Cannot open file";
return "";
}
fseek(fp, 0, SEEK_END);
len = ftell(fp);
if (len == 0) {
buf = (char *)ap_palloc(r->pool, sizeof(char) * 1);
*buf = NUL;
}
else {
if ((buf = (char *)ap_palloc(r->pool, sizeof(char) * (len+1))) == NULL) {
ssl_expr_error = "Cannot allocate memory";
ap_pfclose(r->pool, fp);
return "";
}
fseek(fp, 0, SEEK_SET);
if (fread(buf, len, 1, fp) == 0) {
ssl_expr_error = "Cannot read from file";
fclose(fp);
return ("");
}
buf[len] = NUL;
}
ap_pfclose(r->pool, fp);
return buf;
}
/* a variant of strcmp(3) which works correctly also for number strings */
static int ssl_expr_eval_strcmplex(char *cpNum1, char *cpNum2)
{
int i, n1, n2;
if (cpNum1 == NULL)
return -1;
if (cpNum2 == NULL)
return +1;
n1 = strlen(cpNum1);
n2 = strlen(cpNum2);
if (n1 > n2)
return 1;
if (n1 < n2)
return -1;
for (i = 0; i < n1; i++) {
if (cpNum1[i] > cpNum2[i])
return 1;
if (cpNum1[i] < cpNum2[i])
return -1;
}
return 0;
}
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