mirror of
https://github.com/php/php-src.git
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361 lines
9.1 KiB
C
361 lines
9.1 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 5 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2008 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Derick Rethans <derick@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "php_filter.h"
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#include "filter_private.h"
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#include "ext/standard/php_smart_str.h"
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/* {{{ STRUCTS */
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typedef unsigned long filter_map[256];
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/* }}} */
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/* {{{ HELPER FUNCTIONS */
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static void php_filter_encode_html(zval *value, const unsigned char *chars)
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{
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smart_str str = {0};
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int len = Z_STRLEN_P(value);
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unsigned char *s = (unsigned char *)Z_STRVAL_P(value);
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unsigned char *e = s + len;
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if (Z_STRLEN_P(value) == 0) {
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return;
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}
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while (s < e) {
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if (chars[*s]) {
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smart_str_appendl(&str, "&#", 2);
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smart_str_append_unsigned(&str, (unsigned long)*s);
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smart_str_appendc(&str, ';');
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} else {
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/* XXX: this needs to be optimized to work with blocks of 'safe' chars */
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smart_str_appendc(&str, *s);
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}
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s++;
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}
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smart_str_0(&str);
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efree(Z_STRVAL_P(value));
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Z_STRVAL_P(value) = str.c;
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Z_STRLEN_P(value) = str.len;
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}
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static const unsigned char hexchars[] = "0123456789ABCDEF";
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#define LOWALPHA "abcdefghijklmnopqrstuvwxyz"
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#define HIALPHA "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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#define DIGIT "0123456789"
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#define DEFAULT_URL_ENCODE LOWALPHA HIALPHA DIGIT "-._"
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static void php_filter_encode_url(zval *value, const unsigned char* chars, const int char_len, int high, int low, int encode_nul)
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{
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unsigned char *str, *p;
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unsigned char tmp[256];
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unsigned char *s = (unsigned char *)chars;
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unsigned char *e = s + char_len;
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memset(tmp, 1, sizeof(tmp)-1);
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while (s < e) {
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tmp[*s++] = 0;
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}
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/* XXX: This is not needed since these chars in the allowed list never include the high/low/null value
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if (encode_nul) {
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tmp[0] = 1;
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}
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if (high) {
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memset(tmp + 127, 1, sizeof(tmp) - 127);
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}
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if (low) {
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memset(tmp, 1, 32);
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}
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*/
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p = str = (unsigned char *) safe_emalloc(3, Z_STRLEN_P(value), 1);
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s = (unsigned char *)Z_STRVAL_P(value);
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e = s + Z_STRLEN_P(value);
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while (s < e) {
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if (tmp[*s]) {
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*p++ = '%';
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*p++ = hexchars[(unsigned char) *s >> 4];
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*p++ = hexchars[(unsigned char) *s & 15];
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} else {
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*p++ = *s;
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}
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s++;
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}
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*p = '\0';
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efree(Z_STRVAL_P(value));
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Z_STRVAL_P(value) = (char *)str;
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Z_STRLEN_P(value) = p - str;
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}
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static void php_filter_strip(zval *value, long flags)
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{
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unsigned char *buf, *str;
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int i, c;
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/* Optimization for if no strip flags are set */
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if (! ((flags & FILTER_FLAG_STRIP_LOW) || (flags & FILTER_FLAG_STRIP_HIGH)) ) {
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return;
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}
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str = (unsigned char *)Z_STRVAL_P(value);
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buf = safe_emalloc(1, Z_STRLEN_P(value) + 1, 1);
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c = 0;
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for (i = 0; i < Z_STRLEN_P(value); i++) {
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if ((str[i] > 127) && (flags & FILTER_FLAG_STRIP_HIGH)) {
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} else if ((str[i] < 32) && (flags & FILTER_FLAG_STRIP_LOW)) {
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} else {
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buf[c] = str[i];
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++c;
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}
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}
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/* update zval string data */
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buf[c] = '\0';
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efree(Z_STRVAL_P(value));
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Z_STRVAL_P(value) = (char *)buf;
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Z_STRLEN_P(value) = c;
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}
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/* }}} */
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/* {{{ FILTER MAP HELPERS */
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static void filter_map_init(filter_map *map)
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{
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memset(map, 0, sizeof(filter_map));
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}
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static void filter_map_update(filter_map *map, int flag, const unsigned char *allowed_list)
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{
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int l, i;
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l = strlen((const char*)allowed_list);
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for (i = 0; i < l; ++i) {
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(*map)[allowed_list[i]] = flag;
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}
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}
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static void filter_map_apply(zval *value, filter_map *map)
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{
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unsigned char *buf, *str;
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int i, c;
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str = (unsigned char *)Z_STRVAL_P(value);
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buf = safe_emalloc(1, Z_STRLEN_P(value) + 1, 1);
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c = 0;
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for (i = 0; i < Z_STRLEN_P(value); i++) {
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if ((*map)[str[i]]) {
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buf[c] = str[i];
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++c;
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}
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}
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/* update zval string data */
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buf[c] = '\0';
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efree(Z_STRVAL_P(value));
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Z_STRVAL_P(value) = (char *)buf;
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Z_STRLEN_P(value) = c;
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}
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/* }}} */
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/* {{{ php_filter_string */
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void php_filter_string(PHP_INPUT_FILTER_PARAM_DECL)
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{
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size_t new_len;
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unsigned char enc[256] = {0};
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/* strip high/strip low ( see flags )*/
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php_filter_strip(value, flags);
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if (!(flags & FILTER_FLAG_NO_ENCODE_QUOTES)) {
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enc['\''] = enc['"'] = 1;
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}
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if (flags & FILTER_FLAG_ENCODE_AMP) {
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enc['&'] = 1;
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}
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if (flags & FILTER_FLAG_ENCODE_LOW) {
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memset(enc, 1, 32);
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}
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if (flags & FILTER_FLAG_ENCODE_HIGH) {
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memset(enc + 127, 1, sizeof(enc) - 127);
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}
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php_filter_encode_html(value, enc);
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/* strip tags, implicitly also removes \0 chars */
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new_len = php_strip_tags_ex(Z_STRVAL_P(value), Z_STRLEN_P(value), NULL, NULL, 0, 1);
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Z_STRLEN_P(value) = new_len;
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if (new_len == 0) {
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zval_dtor(value);
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ZVAL_EMPTY_STRING(value);
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return;
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}
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}
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/* }}} */
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/* {{{ php_filter_encoded */
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void php_filter_encoded(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* apply strip_high and strip_low filters */
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php_filter_strip(value, flags);
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/* urlencode */
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php_filter_encode_url(value, (unsigned char *)DEFAULT_URL_ENCODE, sizeof(DEFAULT_URL_ENCODE)-1, flags & FILTER_FLAG_ENCODE_HIGH, flags & FILTER_FLAG_ENCODE_LOW, 1);
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}
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/* }}} */
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/* {{{ php_filter_special_chars */
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void php_filter_special_chars(PHP_INPUT_FILTER_PARAM_DECL)
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{
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unsigned char enc[256] = {0};
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php_filter_strip(value, flags);
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/* encodes ' " < > & \0 to numerical entities */
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enc['\''] = enc['"'] = enc['<'] = enc['>'] = enc['&'] = enc[0] = 1;
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/* if strip low is not set, then we encode them as &#xx; */
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memset(enc, 1, 32);
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if (flags & FILTER_FLAG_ENCODE_HIGH) {
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memset(enc + 127, 1, sizeof(enc) - 127);
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}
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php_filter_encode_html(value, enc);
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}
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/* }}} */
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/* {{{ php_filter_unsafe_raw */
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void php_filter_unsafe_raw(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* Only if no flags are set (optimization) */
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if (flags != 0 && Z_STRLEN_P(value) > 0) {
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unsigned char enc[256] = {0};
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php_filter_strip(value, flags);
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if (flags & FILTER_FLAG_ENCODE_AMP) {
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enc['&'] = 1;
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}
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if (flags & FILTER_FLAG_ENCODE_LOW) {
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memset(enc, 1, 32);
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}
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if (flags & FILTER_FLAG_ENCODE_HIGH) {
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memset(enc + 127, 1, sizeof(enc) - 127);
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}
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php_filter_encode_html(value, enc);
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}
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}
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/* }}} */
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/* {{{ php_filter_email */
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#define SAFE "$-_.+"
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#define EXTRA "!*'(),"
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#define NATIONAL "{}|\\^~[]`"
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#define PUNCTUATION "<>#%\""
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#define RESERVED ";/?:@&="
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void php_filter_email(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* Check section 6 of rfc 822 http://www.faqs.org/rfcs/rfc822.html */
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const unsigned char allowed_list[] = LOWALPHA HIALPHA DIGIT "!#$%&'*+-/=?^_`{|}~@.[]";
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filter_map map;
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filter_map_init(&map);
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filter_map_update(&map, 1, allowed_list);
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filter_map_apply(value, &map);
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}
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/* }}} */
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/* {{{ php_filter_url */
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void php_filter_url(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* Strip all chars not part of section 5 of
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* http://www.faqs.org/rfcs/rfc1738.html */
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const unsigned char allowed_list[] = LOWALPHA HIALPHA DIGIT SAFE EXTRA NATIONAL PUNCTUATION RESERVED;
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filter_map map;
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filter_map_init(&map);
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filter_map_update(&map, 1, allowed_list);
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filter_map_apply(value, &map);
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}
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/* }}} */
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/* {{{ php_filter_number_int */
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void php_filter_number_int(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* strip everything [^0-9+-] */
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const unsigned char allowed_list[] = "+-" DIGIT;
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filter_map map;
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filter_map_init(&map);
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filter_map_update(&map, 1, allowed_list);
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filter_map_apply(value, &map);
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}
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/* }}} */
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/* {{{ php_filter_number_float */
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void php_filter_number_float(PHP_INPUT_FILTER_PARAM_DECL)
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{
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/* strip everything [^0-9+-] */
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const unsigned char allowed_list[] = "+-" DIGIT;
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filter_map map;
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filter_map_init(&map);
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filter_map_update(&map, 1, allowed_list);
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/* depending on flags, strip '.', 'e', ",", "'" */
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if (flags & FILTER_FLAG_ALLOW_FRACTION) {
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filter_map_update(&map, 2, (const unsigned char *) ".");
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}
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if (flags & FILTER_FLAG_ALLOW_THOUSAND) {
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filter_map_update(&map, 3, (const unsigned char *) ",");
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}
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if (flags & FILTER_FLAG_ALLOW_SCIENTIFIC) {
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filter_map_update(&map, 4, (const unsigned char *) "eE");
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}
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filter_map_apply(value, &map);
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}
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/* }}} */
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/* {{{ php_filter_magic_quotes */
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void php_filter_magic_quotes(PHP_INPUT_FILTER_PARAM_DECL)
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{
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char *buf;
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int len;
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/* just call php_addslashes quotes */
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buf = php_addslashes(Z_STRVAL_P(value), Z_STRLEN_P(value), &len, 0 TSRMLS_CC);
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efree(Z_STRVAL_P(value));
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Z_STRVAL_P(value) = buf;
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Z_STRLEN_P(value) = len;
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}
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/* }}} */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: noet sw=4 ts=4 fdm=marker
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* vim<600: noet sw=4 ts=4
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*/
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