summaryrefslogtreecommitdiff
path: root/ext/standard/php_fopen_wrapper.c
blob: a831dd1c161fa10c124ab1f8e2b93089f1f4a1a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
/*
   +----------------------------------------------------------------------+
   | 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.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
   |          Jim Winstead <jimw@php.net>                                 |
   |          Hartmut Holzgraefe <hholzgra@php.net>                       |
   +----------------------------------------------------------------------+
 */
/* $Id$ */

#include <stdio.h>
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "php.h"
#include "php_globals.h"
#include "php_standard.h"
#include "php_fopen_wrappers.h"
#include "SAPI.h"

static size_t php_stream_output_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC) /* {{{ */
{
	PHPWRITE(buf, count);
	return count;
}
/* }}} */

static size_t php_stream_output_read(php_stream *stream, char *buf, size_t count TSRMLS_DC) /* {{{ */
{
	stream->eof = 1;
	return 0;
}
/* }}} */

static int php_stream_output_close(php_stream *stream, int close_handle TSRMLS_DC) /* {{{ */
{
	return 0;
}
/* }}} */

php_stream_ops php_stream_output_ops = {
	php_stream_output_write,
	php_stream_output_read,
	php_stream_output_close,
	NULL, /* flush */
	"Output",
	NULL, /* seek */
	NULL, /* cast */
	NULL, /* stat */
	NULL  /* set_option */
};

static size_t php_stream_input_write(php_stream *stream, const char *buf, size_t count TSRMLS_DC) /* {{{ */
{
	return -1;
}
/* }}} */

static size_t php_stream_input_read(php_stream *stream, char *buf, size_t count TSRMLS_DC) /* {{{ */
{
	off_t *position = (off_t*)stream->abstract;
	size_t read_bytes = 0;

	if (!stream->eof) {
		if (SG(request_info).raw_post_data) { /* data has already been read by a post handler */
			read_bytes = SG(request_info).raw_post_data_length - *position;
			if (read_bytes <= count) {
				stream->eof = 1;
			} else {
				read_bytes = count;
			}
			if (read_bytes) {
				memcpy(buf, SG(request_info).raw_post_data + *position, read_bytes);
			}
		} else if (sapi_module.read_post) {
			read_bytes = sapi_module.read_post(buf, count TSRMLS_CC);
			if (read_bytes <= 0) {
				stream->eof = 1;
				read_bytes = 0;
			}
			/* Increment SG(read_post_bytes) only when something was actually read. */
			SG(read_post_bytes) += read_bytes;
		} else {
			stream->eof = 1;
		}
	}

	*position += read_bytes;

	return read_bytes;
}
/* }}} */

static int php_stream_input_close(php_stream *stream, int close_handle TSRMLS_DC) /* {{{ */
{
	efree(stream->abstract);

	return 0;
}
/* }}} */

static int php_stream_input_flush(php_stream *stream TSRMLS_DC) /* {{{ */
{
	return -1;
}
/* }}} */

php_stream_ops php_stream_input_ops = {
	php_stream_input_write,
	php_stream_input_read,
	php_stream_input_close,
	php_stream_input_flush,
	"Input",
	NULL, /* seek */
	NULL, /* cast */
	NULL, /* stat */
	NULL  /* set_option */
};

static void php_stream_apply_filter_list(php_stream *stream, char *filterlist, int read_chain, int write_chain TSRMLS_DC) /* {{{ */
{
	char *p, *token;
	php_stream_filter *temp_filter;

	p = php_strtok_r(filterlist, "|", &token);
	while (p) {
		php_url_decode(p, strlen(p));
		if (read_chain) {
			if ((temp_filter = php_stream_filter_create(p, NULL, php_stream_is_persistent(stream) TSRMLS_CC))) {
				php_stream_filter_append(&stream->readfilters, temp_filter);
			} else {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to create filter (%s)", p);
			}
		}
		if (write_chain) {
			if ((temp_filter = php_stream_filter_create(p, NULL, php_stream_is_persistent(stream) TSRMLS_CC))) {
				php_stream_filter_append(&stream->writefilters, temp_filter);
			} else {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Unable to create filter (%s)", p);
			}
		}
		p = php_strtok_r(NULL, "|", &token);
	}
}
/* }}} */

php_stream * php_stream_url_wrap_php(php_stream_wrapper *wrapper, char *path, char *mode, int options, char **opened_path, php_stream_context *context STREAMS_DC TSRMLS_DC) /* {{{ */
{
	int fd = -1;
	int mode_rw = 0;
	php_stream * stream = NULL;
	char *p, *token, *pathdup;
	long max_memory;
	FILE *file = NULL;

	if (!strncasecmp(path, "php://", 6)) {
		path += 6;
	}

	if (!strncasecmp(path, "temp", 4)) {
		path += 4;
		max_memory = PHP_STREAM_MAX_MEM;
		if (!strncasecmp(path, "/maxmemory:", 11)) {
			path += 11;
			max_memory = strtol(path, NULL, 10);
			if (max_memory < 0) {
				php_error_docref(NULL TSRMLS_CC, E_RECOVERABLE_ERROR, "Max memory must be >= 0");
				return NULL;
			}
		}
		if (strpbrk(mode, "wa+")) {
			mode_rw = TEMP_STREAM_DEFAULT;
		} else {
			mode_rw = TEMP_STREAM_READONLY;
		}
		return php_stream_temp_create(mode_rw, max_memory);
	}

	if (!strcasecmp(path, "memory")) {
		if (strpbrk(mode, "wa+")) {
			mode_rw = TEMP_STREAM_DEFAULT;
		} else {
			mode_rw = TEMP_STREAM_READONLY;
		}
		return php_stream_memory_create(mode_rw);
	}

	if (!strcasecmp(path, "output")) {
		return php_stream_alloc(&php_stream_output_ops, NULL, 0, "wb");
	}

	if (!strcasecmp(path, "input")) {
		if ((options & STREAM_OPEN_FOR_INCLUDE) && !PG(allow_url_include) ) {
			if (options & REPORT_ERRORS) {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "URL file-access is disabled in the server configuration");
			}
			return NULL;
		}
		return php_stream_alloc(&php_stream_input_ops, ecalloc(1, sizeof(off_t)), 0, "rb");
	}

	if (!strcasecmp(path, "stdin")) {
		if ((options & STREAM_OPEN_FOR_INCLUDE) && !PG(allow_url_include) ) {
			if (options & REPORT_ERRORS) {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "URL file-access is disabled in the server configuration");
			}
			return NULL;
		}
		if (!strcmp(sapi_module.name, "cli")) {
			static int cli_in = 0;
			fd = STDIN_FILENO;
			if (cli_in) {
				fd = dup(fd);
			} else {
				cli_in = 1;
				file = stdin;
			}
		} else {
			fd = dup(STDIN_FILENO);
		}
	} else if (!strcasecmp(path, "stdout")) {
		if (!strcmp(sapi_module.name, "cli")) {
			static int cli_out = 0;
			fd = STDOUT_FILENO;
			if (cli_out++) {
				fd = dup(fd);
			} else {
				cli_out = 1;
				file = stdout;
			}
		} else {
			fd = dup(STDOUT_FILENO);
		}
	} else if (!strcasecmp(path, "stderr")) {
		if (!strcmp(sapi_module.name, "cli")) {
			static int cli_err = 0;
			fd = STDERR_FILENO;
			if (cli_err++) {
				fd = dup(fd);
			} else {
				cli_err = 1;
				file = stderr;
			}
		} else {
			fd = dup(STDERR_FILENO);
		}
	} else if (!strncasecmp(path, "fd/", 3)) {
		char	   *start,
				   *end;
		long	   fildes_ori;
		int		   dtablesize;

		start = &path[3];
		fildes_ori = strtol(start, &end, 10);
		if (end == start || *end != '\0') {
			php_stream_wrapper_log_error(wrapper, options TSRMLS_CC,
				"php://fd/ stream must be specified in the form php://fd/<orig fd>");
			return NULL;
		}

#if HAVE_UNISTD_H
		dtablesize = getdtablesize();
#else
		dtablesize = INT_MAX;
#endif

		if (fildes_ori < 0 || fildes_ori >= dtablesize) {
			php_stream_wrapper_log_error(wrapper, options TSRMLS_CC,
				"The file descriptors must be non-negative numbers smaller than %d", dtablesize);
			return NULL;
		}
		
		fd = dup(fildes_ori);
		if (fd == -1) {
			php_stream_wrapper_log_error(wrapper, options TSRMLS_CC,
				"Error duping file descriptor %ld; possibly it doesn't exist: "
				"[%d]: %s", fildes_ori, errno, strerror(errno));
			return NULL;
		}
	} else if (!strncasecmp(path, "filter/", 7)) {
		/* Save time/memory when chain isn't specified */
		if (strchr(mode, 'r') || strchr(mode, '+')) {
			mode_rw |= PHP_STREAM_FILTER_READ;
		}
		if (strchr(mode, 'w') || strchr(mode, '+') || strchr(mode, 'a')) {
			mode_rw |= PHP_STREAM_FILTER_WRITE;
		}
		pathdup = estrndup(path + 6, strlen(path + 6));
		p = strstr(pathdup, "/resource=");
		if (!p) {
			php_error_docref(NULL TSRMLS_CC, E_RECOVERABLE_ERROR, "No URL resource specified");
			efree(pathdup);
			return NULL;
		}
		if (!(stream = php_stream_open_wrapper(p + 10, mode, options, opened_path))) {
			efree(pathdup);
			return NULL;
		}

		*p = '\0';

		p = php_strtok_r(pathdup + 1, "/", &token);
		while (p) {
			if (!strncasecmp(p, "read=", 5)) {
				php_stream_apply_filter_list(stream, p + 5, 1, 0 TSRMLS_CC);
			} else if (!strncasecmp(p, "write=", 6)) {
				php_stream_apply_filter_list(stream, p + 6, 0, 1 TSRMLS_CC);
			} else {
				php_stream_apply_filter_list(stream, p, mode_rw & PHP_STREAM_FILTER_READ, mode_rw & PHP_STREAM_FILTER_WRITE TSRMLS_CC);
			}
			p = php_strtok_r(NULL, "/", &token);
		}
		efree(pathdup);

		return stream;
	} else {
		/* invalid php://thingy */
		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Invalid php:// URL specified");
		return NULL;
	}

	/* must be stdin, stderr or stdout */
	if (fd == -1)	{
		/* failed to dup */
		return NULL;
	}

#if defined(S_IFSOCK) && !defined(WIN32) && !defined(__BEOS__)
	do {
		struct stat st;
		memset(&st, 0, sizeof(st));
		if (fstat(fd, &st) == 0 && (st.st_mode & S_IFMT) == S_IFSOCK) {
			stream = php_stream_sock_open_from_socket(fd, NULL);
			if (stream) {
				stream->ops = &php_stream_socket_ops;
				return stream;
			}
		}
	} while (0);
#endif

	if (file) {
		stream = php_stream_fopen_from_file(file, mode);
	} else {
		stream = php_stream_fopen_from_fd(fd, mode, NULL);
		if (stream == NULL) {
			close(fd);
		}
	}

	return stream;
}
/* }}} */

static php_stream_wrapper_ops php_stdio_wops = {
	php_stream_url_wrap_php,
	NULL, /* close */
	NULL, /* fstat */
	NULL, /* stat */
	NULL, /* opendir */
	"PHP",
	NULL, /* unlink */
	NULL, /* rename */
	NULL, /* mkdir */
	NULL  /* rmdir */
};

php_stream_wrapper php_stream_php_wrapper =	{
	&php_stdio_wops,
	NULL,
	0, /* is_url */
};


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