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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: Sara Golemon <pollita@php.net> |
+----------------------------------------------------------------------+

$Id$
*/

#include "php.h"

#include "php_mcrypt_filter.h"
#include "php_ini.h"
#include <mcrypt.h>

typedef struct _php_mcrypt_filter_data {
MCRYPT module;
char encrypt;
int blocksize;
char *block_buffer;
int block_used;
char persistent;
} php_mcrypt_filter_data;

static php_stream_filter_status_t php_mcrypt_filter(
php_stream *stream,
php_stream_filter *thisfilter,
php_stream_bucket_brigade *buckets_in,
php_stream_bucket_brigade *buckets_out,
size_t *bytes_consumed,
int flags TSRMLS_DC)
{
php_mcrypt_filter_data *data;
php_stream_bucket *bucket;
size_t consumed = 0;
php_stream_filter_status_t exit_status = PSFS_FEED_ME;

if (!thisfilter || !thisfilter->abstract) {
/* Should never happen */
return PSFS_ERR_FATAL;
}

data = (php_mcrypt_filter_data *)(thisfilter->abstract);
while(buckets_in->head) {
bucket = buckets_in->head;

consumed += bucket->buflen;

if (data->blocksize) {
/* Blockmode cipher */
char *outchunk;
int chunklen = bucket->buflen + data->block_used, n;
php_stream_bucket *newbucket;

outchunk = pemalloc(chunklen, data->persistent);
if (data->block_used) {
memcpy(outchunk, data->block_buffer, data->block_used);
}
memcpy(outchunk + data->block_used, bucket->buf, bucket->buflen);

for(n=0; (n + data->blocksize) <= chunklen; n += data->blocksize) {

if (data->encrypt) {
mcrypt_generic(data->module, outchunk + n, data->blocksize);
} else {
mdecrypt_generic(data->module, outchunk + n, data->blocksize);
}
}
data->block_used = chunklen - n;
memcpy(data->block_buffer, outchunk + n, data->block_used);

newbucket = php_stream_bucket_new(stream, outchunk, n, 1, data->persistent TSRMLS_CC);
php_stream_bucket_append(buckets_out, newbucket TSRMLS_CC);

exit_status = PSFS_PASS_ON;

php_stream_bucket_unlink(bucket TSRMLS_CC);
php_stream_bucket_delref(bucket TSRMLS_CC);
} else {
/* Stream cipher */
php_stream_bucket_make_writeable(bucket TSRMLS_CC);
if (data->encrypt) {
mcrypt_generic(data->module, bucket->buf, bucket->buflen);
} else {
mdecrypt_generic(data->module, bucket->buf, bucket->buflen);
}
php_stream_bucket_append(buckets_out, bucket TSRMLS_CC);

exit_status = PSFS_PASS_ON;
}
}

if ((flags & PSFS_FLAG_FLUSH_CLOSE) && data->blocksize && data->block_used) {
php_stream_bucket *newbucket;

memset(data->block_buffer + data->block_used, 0, data->blocksize - data->block_used);
if (data->encrypt) {
mcrypt_generic(data->module, data->block_buffer, data->blocksize);
} else {
mdecrypt_generic(data->module, data->block_buffer, data->blocksize);
}

newbucket = php_stream_bucket_new(stream, data->block_buffer, data->blocksize, 0, data->persistent TSRMLS_CC);
php_stream_bucket_append(buckets_out, newbucket TSRMLS_CC);

exit_status = PSFS_PASS_ON;
}

if (bytes_consumed) {
*bytes_consumed = consumed;
}

return exit_status;
}

static void php_mcrypt_filter_dtor(php_stream_filter *thisfilter TSRMLS_DC)
{
if (thisfilter && thisfilter->abstract) {
php_mcrypt_filter_data *data = (php_mcrypt_filter_data*)thisfilter->abstract;

if (data->block_buffer) {
pefree(data->block_buffer, data->persistent);
}

mcrypt_generic_deinit(data->module);
mcrypt_module_close(data->module);

pefree(data, data->persistent);
}
}

static php_stream_filter_ops php_mcrypt_filter_ops = {
    php_mcrypt_filter,
    php_mcrypt_filter_dtor,
    "mcrypt.*"
};

/* {{{ php_mcrypt_filter_create
* Instantiate mcrypt filter
*/
static php_stream_filter *php_mcrypt_filter_create(const char *filtername, zval *filterparams, int persistent TSRMLS_DC)
{
int encrypt = 1, iv_len, key_len, keyl, result;
const char *cipher = filtername + sizeof("mcrypt.") - 1;
zval **tmpzval;
MCRYPT mcrypt_module;
char *iv = NULL, *key = NULL;
char *algo_dir = INI_STR("mcrypt.algorithms_dir");
char *mode_dir = INI_STR("mcrypt.modes_dir");
char *mode = "cbc";
php_mcrypt_filter_data *data;

if (strncasecmp(filtername, "mdecrypt.", sizeof("mdecrypt.") - 1) == 0) {
encrypt = 0;
cipher += sizeof("de") - 1;
} else if (strncasecmp(filtername, "mcrypt.", sizeof("mcrypt.") - 1) != 0) {
/* Should never happen */
return NULL;
}

if (!filterparams || Z_TYPE_P(filterparams) != IS_ARRAY) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Filter parameters for %s must be an array", filtername);
return NULL;
}

if (zend_hash_find(HASH_OF(filterparams), "mode", sizeof("mode"), (void**)&tmpzval) == SUCCESS) {
if (Z_TYPE_PP(tmpzval) == IS_STRING) {
mode = Z_STRVAL_PP(tmpzval);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "mode is not a string, ignoring");
}
}

if (zend_hash_find(HASH_OF(filterparams), "algorithms_dir", sizeof("algorithms_dir"), (void**)&tmpzval) == SUCCESS) {
if (Z_TYPE_PP(tmpzval) == IS_STRING) {
algo_dir = Z_STRVAL_PP(tmpzval);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "algorithms_dir is not a string, ignoring");
}
}

if (zend_hash_find(HASH_OF(filterparams), "modes_dir", sizeof("modes_dir"), (void**)&tmpzval) == SUCCESS) {
if (Z_TYPE_PP(tmpzval) == IS_STRING) {
mode_dir = Z_STRVAL_PP(tmpzval);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "modes_dir is not a string, ignoring");
}
}

if (zend_hash_find(HASH_OF(filterparams), "key", sizeof("key"), (void**)&tmpzval) == SUCCESS &&
Z_TYPE_PP(tmpzval) == IS_STRING) {
key = Z_STRVAL_PP(tmpzval);
key_len = Z_STRLEN_PP(tmpzval);
} else {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "key not specified or is not a string");
return NULL;
}

mcrypt_module = mcrypt_module_open(cipher, algo_dir, mode, mode_dir);
if (mcrypt_module == MCRYPT_FAILED) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Could not open encryption module");
return NULL;
}
iv_len = mcrypt_enc_get_iv_size(mcrypt_module);
keyl = mcrypt_enc_get_key_size(mcrypt_module);
if (keyl < key_len) {
key_len = keyl;
}

if (zend_hash_find(HASH_OF(filterparams), "iv", sizeof("iv"), (void**) &tmpzval) == FAILURE ||
Z_TYPE_PP(tmpzval) != IS_STRING) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Filter parameter[iv] not provided or not of type: string");
mcrypt_module_close(mcrypt_module);
return NULL;
}

iv = emalloc(iv_len + 1);
if (iv_len <= Z_STRLEN_PP(tmpzval)) {
memcpy(iv, Z_STRVAL_PP(tmpzval), iv_len);
} else {
memcpy(iv, Z_STRVAL_PP(tmpzval), Z_STRLEN_PP(tmpzval));
memset(iv + Z_STRLEN_PP(tmpzval), 0, iv_len - Z_STRLEN_PP(tmpzval));
}

result = mcrypt_generic_init(mcrypt_module, key, key_len, iv);
efree(iv);
if (result < 0) {
switch (result) {
case -3:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Key length incorrect");
break;
case -4:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Memory allocation error");
break;
case -1:
default:
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unknown error");
break;
}
mcrypt_module_close(mcrypt_module);
return NULL;
}

data = pemalloc(sizeof(php_mcrypt_filter_data), persistent);
data->module = mcrypt_module;
data->encrypt = encrypt;
if (mcrypt_enc_is_block_mode(mcrypt_module)) {
data->blocksize = mcrypt_enc_get_block_size(mcrypt_module);
data->block_buffer = pemalloc(data->blocksize, persistent);
} else {
data->blocksize = 0;
data->block_buffer = NULL;
}
data->block_used = 0;
data->persistent = persistent;

return php_stream_filter_alloc(&php_mcrypt_filter_ops, data, persistent);
}
/* }}} */

php_stream_filter_factory php_mcrypt_filter_factory = {
php_mcrypt_filter_create
};

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: noet sw=4 ts=4 fdm=marker
* vim<600: noet sw=4 ts=4
*/
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