/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2014 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. |
+----------------------------------------------------------------------+
| Authors: Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
/* $Id: cast.c,v 1.1.1.5 2014/06/15 20:04:01 misho Exp $ */
#define _GNU_SOURCE
#include "php.h"
#include "php_globals.h"
#include "php_network.h"
#include "php_open_temporary_file.h"
#include "ext/standard/file.h"
#include <stddef.h>
#include <fcntl.h>
#include "php_streams_int.h"
/* Under BSD, emulate fopencookie using funopen */
#if defined(HAVE_FUNOPEN) && !defined(HAVE_FOPENCOOKIE)
/* NetBSD 6.0+ uses off_t instead of fpos_t in funopen */
# if defined(__NetBSD__) && (__NetBSD_Version__ >= 600000000)
# define PHP_FPOS_T off_t
# else
# define PHP_FPOS_T fpos_t
# endif
typedef struct {
int (*reader)(void *, char *, int);
int (*writer)(void *, const char *, int);
PHP_FPOS_T (*seeker)(void *, PHP_FPOS_T, int);
int (*closer)(void *);
} COOKIE_IO_FUNCTIONS_T;
FILE *fopencookie(void *cookie, const char *mode, COOKIE_IO_FUNCTIONS_T *funcs)
{
return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
}
# define HAVE_FOPENCOOKIE 1
# define PHP_EMULATE_FOPENCOOKIE 1
# define PHP_STREAM_COOKIE_FUNCTIONS &stream_cookie_functions
#elif defined(HAVE_FOPENCOOKIE)
# define PHP_STREAM_COOKIE_FUNCTIONS stream_cookie_functions
#endif
/* {{{ STDIO with fopencookie */
#if defined(PHP_EMULATE_FOPENCOOKIE)
/* use our fopencookie emulation */
static int stream_cookie_reader(void *cookie, char *buffer, int size)
{
int ret;
TSRMLS_FETCH();
ret = php_stream_read((php_stream*)cookie, buffer, size);
return ret;
}
static int stream_cookie_writer(void *cookie, const char *buffer, int size)
{
TSRMLS_FETCH();
return php_stream_write((php_stream *)cookie, (char *)buffer, size);
}
static PHP_FPOS_T stream_cookie_seeker(void *cookie, off_t position, int whence)
{
TSRMLS_FETCH();
return (PHP_FPOS_T)php_stream_seek((php_stream *)cookie, position, whence);
}
static int stream_cookie_closer(void *cookie)
{
php_stream *stream = (php_stream*)cookie;
TSRMLS_FETCH();
/* prevent recursion */
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
return php_stream_close(stream);
}
#elif defined(HAVE_FOPENCOOKIE)
static ssize_t stream_cookie_reader(void *cookie, char *buffer, size_t size)
{
ssize_t ret;
TSRMLS_FETCH();
ret = php_stream_read(((php_stream *)cookie), buffer, size);
return ret;
}
static ssize_t stream_cookie_writer(void *cookie, const char *buffer, size_t size)
{
TSRMLS_FETCH();
return php_stream_write(((php_stream *)cookie), (char *)buffer, size);
}
# ifdef COOKIE_SEEKER_USES_OFF64_T
static int stream_cookie_seeker(void *cookie, __off64_t *position, int whence)
{
TSRMLS_FETCH();
*position = php_stream_seek((php_stream *)cookie, (off_t)*position, whence);
if (*position == -1) {
return -1;
}
return 0;
}
# else
static int stream_cookie_seeker(void *cookie, off_t position, int whence)
{
TSRMLS_FETCH();
return php_stream_seek((php_stream *)cookie, position, whence);
}
# endif
static int stream_cookie_closer(void *cookie)
{
php_stream *stream = (php_stream*)cookie;
TSRMLS_FETCH();
/* prevent recursion */
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
return php_stream_close(stream);
}
#endif /* elif defined(HAVE_FOPENCOOKIE) */
#if HAVE_FOPENCOOKIE
static COOKIE_IO_FUNCTIONS_T stream_cookie_functions =
{
stream_cookie_reader, stream_cookie_writer,
stream_cookie_seeker, stream_cookie_closer
};
#else
/* TODO: use socketpair() to emulate fopencookie, as suggested by Hartmut ? */
#endif
/* }}} */
/* {{{ php_stream_mode_sanitize_fdopen_fopencookie
* Result should have at least size 5, e.g. to write wbx+\0 */
void php_stream_mode_sanitize_fdopen_fopencookie(php_stream *stream, char *result)
{
/* replace modes not supported by fdopen and fopencookie, but supported
* by PHP's fread(), so that their calls won't fail */
const char *cur_mode = stream->mode;
int has_plus = 0,
has_bin = 0,
i,
res_curs = 0;
if (cur_mode[0] == 'r' || cur_mode[0] == 'w' || cur_mode[0] == 'a') {
result[res_curs++] = cur_mode[0];
} else {
/* assume cur_mode[0] is 'c' or 'x'; substitute by 'w', which should not
* truncate anything in fdopen/fopencookie */
result[res_curs++] = 'w';
/* x is allowed (at least by glibc & compat), but not as the 1st mode
* as in PHP and in any case is (at best) ignored by fdopen and fopencookie */
}
/* assume current mode has at most length 4 (e.g. wbn+) */
for (i = 1; i < 4 && cur_mode[i] != '\0'; i++) {
if (cur_mode[i] == 'b') {
has_bin = 1;
} else if (cur_mode[i] == '+') {
has_plus = 1;
}
/* ignore 'n', 't' or other stuff */
}
if (has_bin) {
result[res_curs++] = 'b';
}
if (has_plus) {
result[res_curs++] = '+';
}
result[res_curs] = '\0';
}
/* }}} */
/* {{{ php_stream_cast */
PHPAPI int _php_stream_cast(php_stream *stream, int castas, void **ret, int show_err TSRMLS_DC)
{
int flags = castas & PHP_STREAM_CAST_MASK;
castas &= ~PHP_STREAM_CAST_MASK;
/* synchronize our buffer (if possible) */
if (ret && castas != PHP_STREAM_AS_FD_FOR_SELECT) {
php_stream_flush(stream);
if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
off_t dummy;
stream->ops->seek(stream, stream->position, SEEK_SET, &dummy TSRMLS_CC);
stream->readpos = stream->writepos = 0;
}
}
/* filtered streams can only be cast as stdio, and only when fopencookie is present */
if (castas == PHP_STREAM_AS_STDIO) {
if (stream->stdiocast) {
if (ret) {
*(FILE**)ret = stream->stdiocast;
}
goto exit_success;
}
/* if the stream is a stdio stream let's give it a chance to respond
* first, to avoid doubling up the layers of stdio with an fopencookie */
if (php_stream_is(stream, PHP_STREAM_IS_STDIO) &&
stream->ops->cast &&
!php_stream_is_filtered(stream) &&
stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS
) {
goto exit_success;
}
#if HAVE_FOPENCOOKIE
/* if just checking, say yes we can be a FILE*, but don't actually create it yet */
if (ret == NULL) {
goto exit_success;
}
{
char fixed_mode[5];
php_stream_mode_sanitize_fdopen_fopencookie(stream, fixed_mode);
*(FILE**)ret = fopencookie(stream, fixed_mode, PHP_STREAM_COOKIE_FUNCTIONS);
}
if (*ret != NULL) {
off_t pos;
stream->fclose_stdiocast = PHP_STREAM_FCLOSE_FOPENCOOKIE;
/* If the stream position is not at the start, we need to force
* the stdio layer to believe it's real location. */
pos = php_stream_tell(stream);
if (pos > 0) {
fseek(*ret, pos, SEEK_SET);
}
goto exit_success;
}
/* must be either:
a) programmer error
b) no memory
-> lets bail
*/
php_error_docref(NULL TSRMLS_CC, E_ERROR, "fopencookie failed");
return FAILURE;
#endif
if (!php_stream_is_filtered(stream) && stream->ops->cast && stream->ops->cast(stream, castas, NULL TSRMLS_CC) == SUCCESS) {
if (FAILURE == stream->ops->cast(stream, castas, ret TSRMLS_CC)) {
return FAILURE;
}
goto exit_success;
} else if (flags & PHP_STREAM_CAST_TRY_HARD) {
php_stream *newstream;
newstream = php_stream_fopen_tmpfile();
if (newstream) {
int retcopy = php_stream_copy_to_stream_ex(stream, newstream, PHP_STREAM_COPY_ALL, NULL);
if (retcopy != SUCCESS) {
php_stream_close(newstream);
} else {
int retcast = php_stream_cast(newstream, castas | flags, (void **)ret, show_err);
if (retcast == SUCCESS) {
rewind(*(FILE**)ret);
}
/* do some specialized cleanup */
if ((flags & PHP_STREAM_CAST_RELEASE)) {
php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
}
/* TODO: we probably should be setting .stdiocast and .fclose_stdiocast or
* we may be leaking the FILE*. Needs investigation, though. */
return retcast;
}
}
}
}
if (php_stream_is_filtered(stream)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot cast a filtered stream on this system");
return FAILURE;
} else if (stream->ops->cast && stream->ops->cast(stream, castas, ret TSRMLS_CC) == SUCCESS) {
goto exit_success;
}
if (show_err) {
/* these names depend on the values of the PHP_STREAM_AS_XXX defines in php_streams.h */
static const char *cast_names[4] = {
"STDIO FILE*",
"File Descriptor",
"Socket Descriptor",
"select()able descriptor"
};
php_error_docref(NULL TSRMLS_CC, E_WARNING, "cannot represent a stream of type %s as a %s", stream->ops->label, cast_names[castas]);
}
return FAILURE;
exit_success:
if ((stream->writepos - stream->readpos) > 0 &&
stream->fclose_stdiocast != PHP_STREAM_FCLOSE_FOPENCOOKIE &&
(flags & PHP_STREAM_CAST_INTERNAL) == 0
) {
/* the data we have buffered will be lost to the third party library that
* will be accessing the stream. Emit a warning so that the end-user will
* know that they should try something else */
php_error_docref(NULL TSRMLS_CC, E_WARNING, "%ld bytes of buffered data lost during stream conversion!", (long)(stream->writepos - stream->readpos));
}
if (castas == PHP_STREAM_AS_STDIO && ret) {
stream->stdiocast = *(FILE**)ret;
}
if (flags & PHP_STREAM_CAST_RELEASE) {
php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
}
return SUCCESS;
}
/* }}} */
/* {{{ php_stream_open_wrapper_as_file */
PHPAPI FILE * _php_stream_open_wrapper_as_file(char *path, char *mode, int options, char **opened_path STREAMS_DC TSRMLS_DC)
{
FILE *fp = NULL;
php_stream *stream = NULL;
stream = php_stream_open_wrapper_rel(path, mode, options|STREAM_WILL_CAST, opened_path);
if (stream == NULL) {
return NULL;
}
if (php_stream_cast(stream, PHP_STREAM_AS_STDIO|PHP_STREAM_CAST_TRY_HARD|PHP_STREAM_CAST_RELEASE, (void**)&fp, REPORT_ERRORS) == FAILURE) {
php_stream_close(stream);
if (opened_path && *opened_path) {
efree(*opened_path);
}
return NULL;
}
return fp;
}
/* }}} */
/* {{{ php_stream_make_seekable */
PHPAPI int _php_stream_make_seekable(php_stream *origstream, php_stream **newstream, int flags STREAMS_DC TSRMLS_DC)
{
if (newstream == NULL) {
return PHP_STREAM_FAILED;
}
*newstream = NULL;
if (((flags & PHP_STREAM_FORCE_CONVERSION) == 0) && origstream->ops->seek != NULL) {
*newstream = origstream;
return PHP_STREAM_UNCHANGED;
}
/* Use a tmpfile and copy the old streams contents into it */
if (flags & PHP_STREAM_PREFER_STDIO) {
*newstream = php_stream_fopen_tmpfile();
} else {
*newstream = php_stream_temp_new();
}
if (*newstream == NULL) {
return PHP_STREAM_FAILED;
}
#if ZEND_DEBUG
(*newstream)->open_filename = origstream->open_filename;
(*newstream)->open_lineno = origstream->open_lineno;
#endif
if (php_stream_copy_to_stream_ex(origstream, *newstream, PHP_STREAM_COPY_ALL, NULL) != SUCCESS) {
php_stream_close(*newstream);
*newstream = NULL;
return PHP_STREAM_CRITICAL;
}
php_stream_close(origstream);
php_stream_seek(*newstream, 0, SEEK_SET);
return PHP_STREAM_RELEASED;
}
/* }}} */
/*
* 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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