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php-src/ext/standard/browscap.c
Felipe Pena e4ca0ed09f - Year++
2012-01-01 13:15:04 +00:00

546 lines
17 KiB
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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2012 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include "php_browscap.h"
#include "php_ini.h"
#include "php_string.h"
#include "ext/pcre/php_pcre.h"
#include "zend_ini_scanner.h"
#include "zend_globals.h"
typedef struct {
HashTable *htab;
zval *current_section;
char *current_section_name;
char filename[MAXPATHLEN];
} browser_data;
/* browser data defined in startup phase, eagerly loaded in MINIT */
static browser_data global_bdata = {0};
/* browser data defined in activation phase, lazily loaded in get_browser.
* Per request and per thread, if applicable */
ZEND_BEGIN_MODULE_GLOBALS(browscap)
browser_data activation_bdata;
ZEND_END_MODULE_GLOBALS(browscap)
ZEND_DECLARE_MODULE_GLOBALS(browscap);
#ifdef ZTS
#define BROWSCAP_G(v) TSRMG(browscap_globals_id, zend_browscap_globals *, v)
#else
#define BROWSCAP_G(v) (browscap_globals.v)
#endif
#define DEFAULT_SECTION_NAME "Default Browser Capability Settings"
/* OBJECTS_FIXME: This whole extension needs going through. The use of objects looks pretty broken here */
static void browscap_entry_dtor_request(zval **zvalue) /* {{{ */
{
if (Z_TYPE_PP(zvalue) == IS_ARRAY) {
zend_hash_destroy(Z_ARRVAL_PP(zvalue));
efree(Z_ARRVAL_PP(zvalue));
} else if (Z_TYPE_PP(zvalue) == IS_STRING) {
if (Z_STRVAL_PP(zvalue)) {
efree(Z_STRVAL_PP(zvalue));
}
}
efree(*zvalue);
}
/* }}} */
static void browscap_entry_dtor_persistent(zval **zvalue) /* {{{ */ {
if (Z_TYPE_PP(zvalue) == IS_ARRAY) {
zend_hash_destroy(Z_ARRVAL_PP(zvalue));
free(Z_ARRVAL_PP(zvalue));
} else if (Z_TYPE_PP(zvalue) == IS_STRING) {
if (Z_STRVAL_PP(zvalue)) {
free(Z_STRVAL_PP(zvalue));
}
}
free(*zvalue);
}
/* }}} */
static void convert_browscap_pattern(zval *pattern, int persistent) /* {{{ */
{
int i, j=0;
char *t;
php_strtolower(Z_STRVAL_P(pattern), Z_STRLEN_P(pattern));
t = (char *) safe_pemalloc(Z_STRLEN_P(pattern), 2, 5, persistent);
t[j++] = '\xA7'; /* section sign */
t[j++] = '^';
for (i=0; i<Z_STRLEN_P(pattern); i++, j++) {
switch (Z_STRVAL_P(pattern)[i]) {
case '?':
t[j] = '.';
break;
case '*':
t[j++] = '.';
t[j] = '*';
break;
case '.':
t[j++] = '\\';
t[j] = '.';
break;
case '\\':
t[j++] = '\\';
t[j] = '\\';
break;
case '(':
t[j++] = '\\';
t[j] = '(';
break;
case ')':
t[j++] = '\\';
t[j] = ')';
break;
case '\xA7':
t[j++] = '\\';
t[j] = '\xA7';
break;
default:
t[j] = Z_STRVAL_P(pattern)[i];
break;
}
}
t[j++] = '$';
t[j++] = '\xA7';
t[j]=0;
Z_STRVAL_P(pattern) = t;
Z_STRLEN_P(pattern) = j;
}
/* }}} */
static void php_browscap_parser_cb(zval *arg1, zval *arg2, zval *arg3, int callback_type, void *arg TSRMLS_DC) /* {{{ */
{
browser_data *bdata = arg;
int persistent = bdata->htab->persistent;
if (!arg1) {
return;
}
switch (callback_type) {
case ZEND_INI_PARSER_ENTRY:
if (bdata->current_section && arg2) {
zval *new_property;
char *new_key;
/* parent entry can not be same as current section -> causes infinite loop! */
if (!strcasecmp(Z_STRVAL_P(arg1), "parent") &&
bdata->current_section_name != NULL &&
!strcasecmp(bdata->current_section_name, Z_STRVAL_P(arg2))
) {
zend_error(E_CORE_ERROR, "Invalid browscap ini file: "
"'Parent' value cannot be same as the section name: %s "
"(in file %s)", bdata->current_section_name, INI_STR("browscap"));
return;
}
new_property = (zval *) pemalloc(sizeof(zval), persistent);
INIT_PZVAL(new_property);
Z_TYPE_P(new_property) = IS_STRING;
/* Set proper value for true/false settings */
if ((Z_STRLEN_P(arg2) == 2 && !strncasecmp(Z_STRVAL_P(arg2), "on", sizeof("on") - 1)) ||
(Z_STRLEN_P(arg2) == 3 && !strncasecmp(Z_STRVAL_P(arg2), "yes", sizeof("yes") - 1)) ||
(Z_STRLEN_P(arg2) == 4 && !strncasecmp(Z_STRVAL_P(arg2), "true", sizeof("true") - 1))
) {
Z_STRVAL_P(new_property) = pestrndup("1", 1, persistent);
Z_STRLEN_P(new_property) = 1;
} else if (
(Z_STRLEN_P(arg2) == 2 && !strncasecmp(Z_STRVAL_P(arg2), "no", sizeof("no") - 1)) ||
(Z_STRLEN_P(arg2) == 3 && !strncasecmp(Z_STRVAL_P(arg2), "off", sizeof("off") - 1)) ||
(Z_STRLEN_P(arg2) == 4 && !strncasecmp(Z_STRVAL_P(arg2), "none", sizeof("none") - 1)) ||
(Z_STRLEN_P(arg2) == 5 && !strncasecmp(Z_STRVAL_P(arg2), "false", sizeof("false") - 1))
) {
Z_STRVAL_P(new_property) = pestrndup("", 0, persistent);
Z_STRLEN_P(new_property) = 0;
} else { /* Other than true/false setting */
Z_STRVAL_P(new_property) = pestrndup(Z_STRVAL_P(arg2),
Z_STRLEN_P(arg2), persistent);
Z_STRLEN_P(new_property) = Z_STRLEN_P(arg2);
}
new_key = pestrndup(Z_STRVAL_P(arg1), Z_STRLEN_P(arg1), persistent);
zend_str_tolower(new_key, Z_STRLEN_P(arg1));
zend_hash_update(Z_ARRVAL_P(bdata->current_section), new_key, Z_STRLEN_P(arg1) + 1, &new_property, sizeof(zval *), NULL);
pefree(new_key, persistent);
}
break;
case ZEND_INI_PARSER_SECTION: {
zval *processed;
zval *unprocessed;
HashTable *section_properties;
/*printf("'%s' (%d)\n",$1.value.str.val,$1.value.str.len + 1);*/
bdata->current_section = (zval *) pemalloc(sizeof(zval), persistent);
INIT_PZVAL(bdata->current_section);
processed = (zval *) pemalloc(sizeof(zval), persistent);
INIT_PZVAL(processed);
unprocessed = (zval *) pemalloc(sizeof(zval), persistent);
INIT_PZVAL(unprocessed);
section_properties = (HashTable *) pemalloc(sizeof(HashTable), persistent);
zend_hash_init(section_properties, 0, NULL,
(dtor_func_t) (persistent?browscap_entry_dtor_persistent
:browscap_entry_dtor_request),
persistent);
Z_ARRVAL_P(bdata->current_section) = section_properties;
Z_TYPE_P(bdata->current_section) = IS_ARRAY;
if (bdata->current_section_name) {
pefree(bdata->current_section_name, persistent);
}
bdata->current_section_name = pestrndup(Z_STRVAL_P(arg1),
Z_STRLEN_P(arg1), persistent);
zend_hash_update(bdata->htab, Z_STRVAL_P(arg1), Z_STRLEN_P(arg1) + 1, (void *) &bdata->current_section, sizeof(zval *), NULL);
Z_STRVAL_P(processed) = Z_STRVAL_P(arg1);
Z_STRLEN_P(processed) = Z_STRLEN_P(arg1);
Z_TYPE_P(processed) = IS_STRING;
Z_STRVAL_P(unprocessed) = Z_STRVAL_P(arg1);
Z_STRLEN_P(unprocessed) = Z_STRLEN_P(arg1);
Z_TYPE_P(unprocessed) = IS_STRING;
Z_STRVAL_P(unprocessed) = pestrndup(Z_STRVAL_P(unprocessed), Z_STRLEN_P(unprocessed), persistent);
convert_browscap_pattern(processed, persistent);
zend_hash_update(section_properties, "browser_name_regex", sizeof("browser_name_regex"), (void *) &processed, sizeof(zval *), NULL);
zend_hash_update(section_properties, "browser_name_pattern", sizeof("browser_name_pattern"), (void *) &unprocessed, sizeof(zval *), NULL);
}
break;
}
}
/* }}} */
static int browscap_read_file(char *filename, browser_data *browdata, int persistent TSRMLS_DC) /* {{{ */
{
zend_file_handle fh = {0};
if (filename == NULL || filename[0] == '\0') {
return FAILURE;
}
browdata->htab = pemalloc(sizeof *browdata->htab, persistent);
if (browdata->htab == NULL) {
return FAILURE;
}
if (zend_hash_init_ex(browdata->htab, 0, NULL,
(dtor_func_t) (persistent?browscap_entry_dtor_persistent
:browscap_entry_dtor_request),
persistent, 0) == FAILURE) {
pefree(browdata->htab, persistent);
browdata->htab = NULL;
return FAILURE;
}
fh.handle.fp = VCWD_FOPEN(filename, "r");
fh.opened_path = NULL;
fh.free_filename = 0;
if (!fh.handle.fp) {
zend_hash_destroy(browdata->htab);
pefree(browdata->htab, persistent);
browdata->htab = NULL;
zend_error(E_CORE_WARNING, "Cannot open '%s' for reading", filename);
return FAILURE;
}
fh.filename = filename;
Z_TYPE(fh) = ZEND_HANDLE_FP;
browdata->current_section_name = NULL;
zend_parse_ini_file(&fh, 1, ZEND_INI_SCANNER_RAW,
(zend_ini_parser_cb_t) php_browscap_parser_cb, browdata TSRMLS_CC);
if (browdata->current_section_name != NULL) {
pefree(browdata->current_section_name, persistent);
browdata->current_section_name = NULL;
}
return SUCCESS;
}
/* }}} */
#ifdef ZTS
static void browscap_globals_ctor(zend_browscap_globals *browscap_globals TSRMLS_DC) /* {{{ */
{
browscap_globals->activation_bdata.htab = NULL;
browscap_globals->activation_bdata.current_section = NULL;
browscap_globals->activation_bdata.current_section_name = NULL;
browscap_globals->activation_bdata.filename[0] = '\0';
}
/* }}} */
#endif
static void browscap_bdata_dtor(browser_data *bdata, int persistent TSRMLS_DC) /* {{{ */
{
if (bdata->htab != NULL) {
zend_hash_destroy(bdata->htab);
pefree(bdata->htab, persistent);
bdata->htab = NULL;
}
bdata->filename[0] = '\0';
/* current_section_* are only used during parsing */
}
/* }}} */
/* {{{ PHP_INI_MH
*/
PHP_INI_MH(OnChangeBrowscap)
{
if (stage == PHP_INI_STAGE_STARTUP) {
/* value handled in browscap.c's MINIT */
return SUCCESS;
} else if (stage == PHP_INI_STAGE_ACTIVATE) {
browser_data *bdata = &BROWSCAP_G(activation_bdata);
if (bdata->filename[0] != '\0') {
browscap_bdata_dtor(bdata, 0 TSRMLS_CC);
}
if (VCWD_REALPATH(new_value, bdata->filename) == NULL) {
return FAILURE;
}
return SUCCESS;
}
return FAILURE;
}
/* }}} */
PHP_MINIT_FUNCTION(browscap) /* {{{ */
{
char *browscap = INI_STR("browscap");
#ifdef ZTS
ts_allocate_id(&browscap_globals_id, sizeof(browser_data),
browscap_globals_ctor, NULL);
#endif
/* ctor call not really needed for non-ZTS */
if (browscap && browscap[0]) {
if (browscap_read_file(browscap, &global_bdata, 1 TSRMLS_CC) == FAILURE) {
return FAILURE;
}
}
return SUCCESS;
}
/* }}} */
PHP_RSHUTDOWN_FUNCTION(browscap) /* {{{ */
{
browser_data *bdata = &BROWSCAP_G(activation_bdata);
if (bdata->filename[0] != '\0') {
browscap_bdata_dtor(bdata, 0 TSRMLS_CC);
}
return SUCCESS;
}
/* }}} */
PHP_MSHUTDOWN_FUNCTION(browscap) /* {{{ */
{
browscap_bdata_dtor(&global_bdata, 1 TSRMLS_CC);
return SUCCESS;
}
/* }}} */
static int browser_reg_compare(zval **browser TSRMLS_DC, int num_args, va_list args, zend_hash_key *key) /* {{{ */
{
zval **browser_regex, **previous_match;
pcre *re;
int re_options;
pcre_extra *re_extra;
char *lookup_browser_name = va_arg(args, char *);
int lookup_browser_length = va_arg(args, int);
zval **found_browser_entry = va_arg(args, zval **);
/* See if we have an exact match, if so, we're done... */
if (*found_browser_entry) {
if (zend_hash_find(Z_ARRVAL_PP(found_browser_entry), "browser_name_pattern", sizeof("browser_name_pattern"), (void**) &previous_match) == FAILURE) {
return 0;
}
else if (!strcasecmp(Z_STRVAL_PP(previous_match), lookup_browser_name)) {
return 0;
}
}
if (zend_hash_find(Z_ARRVAL_PP(browser), "browser_name_regex", sizeof("browser_name_regex"), (void **) &browser_regex) == FAILURE) {
return 0;
}
re = pcre_get_compiled_regex(Z_STRVAL_PP(browser_regex), &re_extra, &re_options TSRMLS_CC);
if (re == NULL) {
return 0;
}
if (pcre_exec(re, re_extra, lookup_browser_name, lookup_browser_length, 0, re_options, NULL, 0) == 0) {
/* If we've found a possible browser, we need to do a comparison of the
number of characters changed in the user agent being checked versus
the previous match found and the current match. */
if (*found_browser_entry) {
int i, prev_len = 0, curr_len = 0, ua_len;
zval **current_match;
if (zend_hash_find(Z_ARRVAL_PP(browser), "browser_name_pattern", sizeof("browser_name_pattern"), (void**) &current_match) == FAILURE) {
return 0;
}
ua_len = lookup_browser_length;
for (i = 0; i < Z_STRLEN_PP(previous_match); i++) {
switch (Z_STRVAL_PP(previous_match)[i]) {
case '?':
case '*':
/* do nothing, ignore these characters in the count */
break;
default:
++prev_len;
}
}
for (i = 0; i < Z_STRLEN_PP(current_match); i++) {
switch (Z_STRVAL_PP(current_match)[i]) {
case '?':
case '*':
/* do nothing, ignore these characters in the count */
break;
default:
++curr_len;
}
}
/* Pick which browser pattern replaces the least amount of
characters when compared to the original user agent string... */
if (ua_len - prev_len > ua_len - curr_len) {
*found_browser_entry = *browser;
}
}
else {
*found_browser_entry = *browser;
}
}
return 0;
}
/* }}} */
/* {{{ proto mixed get_browser([string browser_name [, bool return_array]])
Get information about the capabilities of a browser. If browser_name is omitted or null, HTTP_USER_AGENT is used. Returns an object by default; if return_array is true, returns an array. */
PHP_FUNCTION(get_browser)
{
char *agent_name = NULL;
int agent_name_len = 0;
zend_bool return_array = 0;
zval **agent, **z_agent_name, **http_user_agent;
zval *found_browser_entry, *tmp_copy;
char *lookup_browser_name;
browser_data *bdata;
if (BROWSCAP_G(activation_bdata).filename[0] != '\0') {
bdata = &BROWSCAP_G(activation_bdata);
if (bdata->htab == NULL) { /* not initialized yet */
if (browscap_read_file(bdata->filename, bdata, 0 TSRMLS_CC) == FAILURE) {
RETURN_FALSE;
}
}
} else {
if (!global_bdata.htab) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "browscap ini directive not set");
RETURN_FALSE;
}
bdata = &global_bdata;
}
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|s!b", &agent_name, &agent_name_len, &return_array) == FAILURE) {
return;
}
if (agent_name == NULL) {
zend_is_auto_global("_SERVER", sizeof("_SERVER") - 1 TSRMLS_CC);
if (!PG(http_globals)[TRACK_VARS_SERVER] ||
zend_hash_find(HASH_OF(PG(http_globals)[TRACK_VARS_SERVER]), "HTTP_USER_AGENT", sizeof("HTTP_USER_AGENT"), (void **) &http_user_agent) == FAILURE
) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "HTTP_USER_AGENT variable is not set, cannot determine user agent name");
RETURN_FALSE;
}
agent_name = Z_STRVAL_PP(http_user_agent);
agent_name_len = Z_STRLEN_PP(http_user_agent);
}
lookup_browser_name = estrndup(agent_name, agent_name_len);
php_strtolower(lookup_browser_name, agent_name_len);
if (zend_hash_find(bdata->htab, lookup_browser_name, agent_name_len + 1, (void **) &agent) == FAILURE) {
found_browser_entry = NULL;
zend_hash_apply_with_arguments(bdata->htab TSRMLS_CC, (apply_func_args_t) browser_reg_compare, 3, lookup_browser_name, agent_name_len, &found_browser_entry);
if (found_browser_entry) {
agent = &found_browser_entry;
} else if (zend_hash_find(bdata->htab, DEFAULT_SECTION_NAME, sizeof(DEFAULT_SECTION_NAME), (void **) &agent) == FAILURE) {
efree(lookup_browser_name);
RETURN_FALSE;
}
}
if (return_array) {
array_init(return_value);
zend_hash_copy(Z_ARRVAL_P(return_value), Z_ARRVAL_PP(agent), (copy_ctor_func_t) zval_add_ref, (void *) &tmp_copy, sizeof(zval *));
}
else {
object_init(return_value);
zend_hash_copy(Z_OBJPROP_P(return_value), Z_ARRVAL_PP(agent), (copy_ctor_func_t) zval_add_ref, (void *) &tmp_copy, sizeof(zval *));
}
while (zend_hash_find(Z_ARRVAL_PP(agent), "parent", sizeof("parent"), (void **) &z_agent_name) == SUCCESS) {
if (zend_hash_find(bdata->htab, Z_STRVAL_PP(z_agent_name), Z_STRLEN_PP(z_agent_name) + 1, (void **)&agent) == FAILURE) {
break;
}
if (return_array) {
zend_hash_merge(Z_ARRVAL_P(return_value), Z_ARRVAL_PP(agent), (copy_ctor_func_t) zval_add_ref, (void *) &tmp_copy, sizeof(zval *), 0);
}
else {
zend_hash_merge(Z_OBJPROP_P(return_value), Z_ARRVAL_PP(agent), (copy_ctor_func_t) zval_add_ref, (void *) &tmp_copy, sizeof(zval *), 0);
}
}
efree(lookup_browser_name);
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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