1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2017 The PHP Group |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 3.01 of the PHP license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.php.net/license/3_01.txt |
11 | If you did not receive a copy of the PHP license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@php.net so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Wez Furlong <wez@thebrainroom.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 #define _GNU_SOURCE
22 #include "php.h"
23 #include "php_globals.h"
24 #include "php_network.h"
25 #include "php_open_temporary_file.h"
26 #include "ext/standard/file.h"
27 #include <stddef.h>
28 #include <fcntl.h>
29
30 #include "php_streams_int.h"
31
32 /* Under BSD, emulate fopencookie using funopen */
33 #if defined(HAVE_FUNOPEN) && !defined(HAVE_FOPENCOOKIE)
34
35 /* NetBSD 6.0+ uses off_t instead of fpos_t in funopen */
36 # if defined(__NetBSD__) && (__NetBSD_Version__ >= 600000000)
37 # define PHP_FPOS_T off_t
38 # else
39 # define PHP_FPOS_T fpos_t
40 # endif
41
42 typedef struct {
43 int (*reader)(void *, char *, int);
44 int (*writer)(void *, const char *, int);
45 PHP_FPOS_T (*seeker)(void *, PHP_FPOS_T, int);
46 int (*closer)(void *);
47 } COOKIE_IO_FUNCTIONS_T;
48
fopencookie(void * cookie,const char * mode,COOKIE_IO_FUNCTIONS_T * funcs)49 FILE *fopencookie(void *cookie, const char *mode, COOKIE_IO_FUNCTIONS_T *funcs)
50 {
51 return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
52 }
53 # define HAVE_FOPENCOOKIE 1
54 # define PHP_EMULATE_FOPENCOOKIE 1
55 # define PHP_STREAM_COOKIE_FUNCTIONS &stream_cookie_functions
56 #elif defined(HAVE_FOPENCOOKIE)
57 # define PHP_STREAM_COOKIE_FUNCTIONS stream_cookie_functions
58 #endif
59
60 /* {{{ STDIO with fopencookie */
61 #if defined(PHP_EMULATE_FOPENCOOKIE)
62 /* use our fopencookie emulation */
stream_cookie_reader(void * cookie,char * buffer,int size)63 static int stream_cookie_reader(void *cookie, char *buffer, int size)
64 {
65 int ret;
66
67 ret = php_stream_read((php_stream*)cookie, buffer, size);
68 return ret;
69 }
70
stream_cookie_writer(void * cookie,const char * buffer,int size)71 static int stream_cookie_writer(void *cookie, const char *buffer, int size)
72 {
73
74 return php_stream_write((php_stream *)cookie, (char *)buffer, size);
75 }
76
stream_cookie_seeker(void * cookie,zend_off_t position,int whence)77 static PHP_FPOS_T stream_cookie_seeker(void *cookie, zend_off_t position, int whence)
78 {
79
80 return (PHP_FPOS_T)php_stream_seek((php_stream *)cookie, position, whence);
81 }
82
stream_cookie_closer(void * cookie)83 static int stream_cookie_closer(void *cookie)
84 {
85 php_stream *stream = (php_stream*)cookie;
86
87 /* prevent recursion */
88 stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
89 return php_stream_free(stream, PHP_STREAM_FREE_CLOSE | PHP_STREAM_FREE_KEEP_RSRC);
90 }
91 #elif defined(HAVE_FOPENCOOKIE)
stream_cookie_reader(void * cookie,char * buffer,size_t size)92 static ssize_t stream_cookie_reader(void *cookie, char *buffer, size_t size)
93 {
94 ssize_t ret;
95
96 ret = php_stream_read(((php_stream *)cookie), buffer, size);
97 return ret;
98 }
99
stream_cookie_writer(void * cookie,const char * buffer,size_t size)100 static ssize_t stream_cookie_writer(void *cookie, const char *buffer, size_t size)
101 {
102
103 return php_stream_write(((php_stream *)cookie), (char *)buffer, size);
104 }
105
106 # ifdef COOKIE_SEEKER_USES_OFF64_T
stream_cookie_seeker(void * cookie,__off64_t * position,int whence)107 static int stream_cookie_seeker(void *cookie, __off64_t *position, int whence)
108 {
109
110 *position = php_stream_seek((php_stream *)cookie, (zend_off_t)*position, whence);
111
112 if (*position == -1) {
113 return -1;
114 }
115 return 0;
116 }
117 # else
stream_cookie_seeker(void * cookie,zend_off_t position,int whence)118 static int stream_cookie_seeker(void *cookie, zend_off_t position, int whence)
119 {
120
121 return php_stream_seek((php_stream *)cookie, position, whence);
122 }
123 # endif
124
stream_cookie_closer(void * cookie)125 static int stream_cookie_closer(void *cookie)
126 {
127 php_stream *stream = (php_stream*)cookie;
128
129 /* prevent recursion */
130 stream->fclose_stdiocast = PHP_STREAM_FCLOSE_NONE;
131 return php_stream_free(stream, PHP_STREAM_FREE_CLOSE | PHP_STREAM_FREE_KEEP_RSRC);
132 }
133 #endif /* elif defined(HAVE_FOPENCOOKIE) */
134
135 #if HAVE_FOPENCOOKIE
136 static COOKIE_IO_FUNCTIONS_T stream_cookie_functions =
137 {
138 stream_cookie_reader, stream_cookie_writer,
139 stream_cookie_seeker, stream_cookie_closer
140 };
141 #else
142 /* TODO: use socketpair() to emulate fopencookie, as suggested by Hartmut ? */
143 #endif
144 /* }}} */
145
146 /* {{{ php_stream_mode_sanitize_fdopen_fopencookie
147 * Result should have at least size 5, e.g. to write wbx+\0 */
php_stream_mode_sanitize_fdopen_fopencookie(php_stream * stream,char * result)148 void php_stream_mode_sanitize_fdopen_fopencookie(php_stream *stream, char *result)
149 {
150 /* replace modes not supported by fdopen and fopencookie, but supported
151 * by PHP's fread(), so that their calls won't fail */
152 const char *cur_mode = stream->mode;
153 int has_plus = 0,
154 has_bin = 0,
155 i,
156 res_curs = 0;
157
158 if (cur_mode[0] == 'r' || cur_mode[0] == 'w' || cur_mode[0] == 'a') {
159 result[res_curs++] = cur_mode[0];
160 } else {
161 /* assume cur_mode[0] is 'c' or 'x'; substitute by 'w', which should not
162 * truncate anything in fdopen/fopencookie */
163 result[res_curs++] = 'w';
164
165 /* x is allowed (at least by glibc & compat), but not as the 1st mode
166 * as in PHP and in any case is (at best) ignored by fdopen and fopencookie */
167 }
168
169 /* assume current mode has at most length 4 (e.g. wbn+) */
170 for (i = 1; i < 4 && cur_mode[i] != '\0'; i++) {
171 if (cur_mode[i] == 'b') {
172 has_bin = 1;
173 } else if (cur_mode[i] == '+') {
174 has_plus = 1;
175 }
176 /* ignore 'n', 't' or other stuff */
177 }
178
179 if (has_bin) {
180 result[res_curs++] = 'b';
181 }
182 if (has_plus) {
183 result[res_curs++] = '+';
184 }
185
186 result[res_curs] = '\0';
187 }
188 /* }}} */
189
190 /* {{{ php_stream_cast */
_php_stream_cast(php_stream * stream,int castas,void ** ret,int show_err)191 PHPAPI int _php_stream_cast(php_stream *stream, int castas, void **ret, int show_err)
192 {
193 int flags = castas & PHP_STREAM_CAST_MASK;
194 castas &= ~PHP_STREAM_CAST_MASK;
195
196 /* synchronize our buffer (if possible) */
197 if (ret && castas != PHP_STREAM_AS_FD_FOR_SELECT) {
198 php_stream_flush(stream);
199 if (stream->ops->seek && (stream->flags & PHP_STREAM_FLAG_NO_SEEK) == 0) {
200 zend_off_t dummy;
201
202 stream->ops->seek(stream, stream->position, SEEK_SET, &dummy);
203 stream->readpos = stream->writepos = 0;
204 }
205 }
206
207 /* filtered streams can only be cast as stdio, and only when fopencookie is present */
208
209 if (castas == PHP_STREAM_AS_STDIO) {
210 if (stream->stdiocast) {
211 if (ret) {
212 *(FILE**)ret = stream->stdiocast;
213 }
214 goto exit_success;
215 }
216
217 /* if the stream is a stdio stream let's give it a chance to respond
218 * first, to avoid doubling up the layers of stdio with an fopencookie */
219 if (php_stream_is(stream, PHP_STREAM_IS_STDIO) &&
220 stream->ops->cast &&
221 !php_stream_is_filtered(stream) &&
222 stream->ops->cast(stream, castas, ret) == SUCCESS
223 ) {
224 goto exit_success;
225 }
226
227 #if HAVE_FOPENCOOKIE
228 /* if just checking, say yes we can be a FILE*, but don't actually create it yet */
229 if (ret == NULL) {
230 goto exit_success;
231 }
232
233 {
234 char fixed_mode[5];
235 php_stream_mode_sanitize_fdopen_fopencookie(stream, fixed_mode);
236 *(FILE**)ret = fopencookie(stream, fixed_mode, PHP_STREAM_COOKIE_FUNCTIONS);
237 }
238
239 if (*ret != NULL) {
240 zend_off_t pos;
241
242 stream->fclose_stdiocast = PHP_STREAM_FCLOSE_FOPENCOOKIE;
243
244 /* If the stream position is not at the start, we need to force
245 * the stdio layer to believe it's real location. */
246 pos = php_stream_tell(stream);
247 if (pos > 0) {
248 zend_fseek(*ret, pos, SEEK_SET);
249 }
250
251 goto exit_success;
252 }
253
254 /* must be either:
255 a) programmer error
256 b) no memory
257 -> lets bail
258 */
259 php_error_docref(NULL, E_ERROR, "fopencookie failed");
260 return FAILURE;
261 #endif
262
263 if (!php_stream_is_filtered(stream) && stream->ops->cast && stream->ops->cast(stream, castas, NULL) == SUCCESS) {
264 if (FAILURE == stream->ops->cast(stream, castas, ret)) {
265 return FAILURE;
266 }
267 goto exit_success;
268 } else if (flags & PHP_STREAM_CAST_TRY_HARD) {
269 php_stream *newstream;
270
271 newstream = php_stream_fopen_tmpfile();
272 if (newstream) {
273 int retcopy = php_stream_copy_to_stream_ex(stream, newstream, PHP_STREAM_COPY_ALL, NULL);
274
275 if (retcopy != SUCCESS) {
276 php_stream_close(newstream);
277 } else {
278 int retcast = php_stream_cast(newstream, castas | flags, (void **)ret, show_err);
279
280 if (retcast == SUCCESS) {
281 rewind(*(FILE**)ret);
282 }
283
284 /* do some specialized cleanup */
285 if ((flags & PHP_STREAM_CAST_RELEASE)) {
286 php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
287 }
288
289 /* TODO: we probably should be setting .stdiocast and .fclose_stdiocast or
290 * we may be leaking the FILE*. Needs investigation, though. */
291 return retcast;
292 }
293 }
294 }
295 }
296
297 if (php_stream_is_filtered(stream)) {
298 php_error_docref(NULL, E_WARNING, "cannot cast a filtered stream on this system");
299 return FAILURE;
300 } else if (stream->ops->cast && stream->ops->cast(stream, castas, ret) == SUCCESS) {
301 goto exit_success;
302 }
303
304 if (show_err) {
305 /* these names depend on the values of the PHP_STREAM_AS_XXX defines in php_streams.h */
306 static const char *cast_names[4] = {
307 "STDIO FILE*",
308 "File Descriptor",
309 "Socket Descriptor",
310 "select()able descriptor"
311 };
312
313 php_error_docref(NULL, E_WARNING, "cannot represent a stream of type %s as a %s", stream->ops->label, cast_names[castas]);
314 }
315
316 return FAILURE;
317
318 exit_success:
319
320 if ((stream->writepos - stream->readpos) > 0 &&
321 stream->fclose_stdiocast != PHP_STREAM_FCLOSE_FOPENCOOKIE &&
322 (flags & PHP_STREAM_CAST_INTERNAL) == 0
323 ) {
324 /* the data we have buffered will be lost to the third party library that
325 * will be accessing the stream. Emit a warning so that the end-user will
326 * know that they should try something else */
327
328 php_error_docref(NULL, E_WARNING, ZEND_LONG_FMT " bytes of buffered data lost during stream conversion!", (zend_long)(stream->writepos - stream->readpos));
329 }
330
331 if (castas == PHP_STREAM_AS_STDIO && ret) {
332 stream->stdiocast = *(FILE**)ret;
333 }
334
335 if (flags & PHP_STREAM_CAST_RELEASE) {
336 php_stream_free(stream, PHP_STREAM_FREE_CLOSE_CASTED);
337 }
338
339 return SUCCESS;
340
341 }
342 /* }}} */
343
344 /* {{{ php_stream_open_wrapper_as_file */
_php_stream_open_wrapper_as_file(char * path,char * mode,int options,zend_string ** opened_path STREAMS_DC)345 PHPAPI FILE * _php_stream_open_wrapper_as_file(char *path, char *mode, int options, zend_string **opened_path STREAMS_DC)
346 {
347 FILE *fp = NULL;
348 php_stream *stream = NULL;
349
350 stream = php_stream_open_wrapper_rel(path, mode, options|STREAM_WILL_CAST, opened_path);
351
352 if (stream == NULL) {
353 return NULL;
354 }
355
356 if (php_stream_cast(stream, PHP_STREAM_AS_STDIO|PHP_STREAM_CAST_TRY_HARD|PHP_STREAM_CAST_RELEASE, (void**)&fp, REPORT_ERRORS) == FAILURE) {
357 php_stream_close(stream);
358 if (opened_path && *opened_path) {
359 zend_string_release(*opened_path);
360 }
361 return NULL;
362 }
363 return fp;
364 }
365 /* }}} */
366
367 /* {{{ php_stream_make_seekable */
_php_stream_make_seekable(php_stream * origstream,php_stream ** newstream,int flags STREAMS_DC)368 PHPAPI int _php_stream_make_seekable(php_stream *origstream, php_stream **newstream, int flags STREAMS_DC)
369 {
370 if (newstream == NULL) {
371 return PHP_STREAM_FAILED;
372 }
373 *newstream = NULL;
374
375 if (((flags & PHP_STREAM_FORCE_CONVERSION) == 0) && origstream->ops->seek != NULL) {
376 *newstream = origstream;
377 return PHP_STREAM_UNCHANGED;
378 }
379
380 /* Use a tmpfile and copy the old streams contents into it */
381
382 if (flags & PHP_STREAM_PREFER_STDIO) {
383 *newstream = php_stream_fopen_tmpfile();
384 } else {
385 *newstream = php_stream_temp_new();
386 }
387
388 if (*newstream == NULL) {
389 return PHP_STREAM_FAILED;
390 }
391
392 #if ZEND_DEBUG
393 (*newstream)->open_filename = origstream->open_filename;
394 (*newstream)->open_lineno = origstream->open_lineno;
395 #endif
396
397 if (php_stream_copy_to_stream_ex(origstream, *newstream, PHP_STREAM_COPY_ALL, NULL) != SUCCESS) {
398 php_stream_close(*newstream);
399 *newstream = NULL;
400 return PHP_STREAM_CRITICAL;
401 }
402
403 php_stream_close(origstream);
404 php_stream_seek(*newstream, 0, SEEK_SET);
405
406 return PHP_STREAM_RELEASED;
407 }
408 /* }}} */
409
410 /*
411 * Local variables:
412 * tab-width: 4
413 * c-basic-offset: 4
414 * End:
415 * vim600: noet sw=4 ts=4 fdm=marker
416 * vim<600: noet sw=4 ts=4
417 */
418
