xref: /PHP-5.4/main/php_open_temporary_file.c (revision c0d060f5)
1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 5                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1997-2014 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    | Author: Zeev Suraski <zeev@zend.com>                                 |
16    +----------------------------------------------------------------------+
17  */
18 
19 /* $Id$ */
20 
21 #include "php.h"
22 
23 #include <errno.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 
28 #ifdef PHP_WIN32
29 #define O_RDONLY _O_RDONLY
30 #include "win32/param.h"
31 #include "win32/winutil.h"
32 #elif defined(NETWARE)
33 #ifdef USE_WINSOCK
34 #include <novsock2.h>
35 #else
36 #include <sys/socket.h>
37 #endif
38 #include <sys/param.h>
39 #else
40 #include <sys/param.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <netdb.h>
44 #if HAVE_ARPA_INET_H
45 #include <arpa/inet.h>
46 #endif
47 #endif
48 #ifdef HAVE_SYS_TIME_H
49 #include <sys/time.h>
50 #endif
51 
52 #ifdef HAVE_SYS_FILE_H
53 #include <sys/file.h>
54 #endif
55 
56 #if !defined(P_tmpdir)
57 #define P_tmpdir ""
58 #endif
59 
60 /* {{{ php_do_open_temporary_file */
61 
62 /* Loosely based on a tempnam() implementation by UCLA */
63 
64 /*
65  * Copyright (c) 1988, 1993
66  *      The Regents of the University of California.  All rights reserved.
67  *
68  * Redistribution and use in source and binary forms, with or without
69  * modification, are permitted provided that the following conditions
70  * are met:
71  * 1. Redistributions of source code must retain the above copyright
72  *    notice, this list of conditions and the following disclaimer.
73  * 2. Redistributions in binary form must reproduce the above copyright
74  *    notice, this list of conditions and the following disclaimer in the
75  *    documentation and/or other materials provided with the distribution.
76  * 3. All advertising materials mentioning features or use of this software
77  *    must display the following acknowledgement:
78  *      This product includes software developed by the University of
79  *      California, Berkeley and its contributors.
80  * 4. Neither the name of the University nor the names of its contributors
81  *    may be used to endorse or promote products derived from this software
82  *    without specific prior written permission.
83  *
84  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
85  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
86  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
87  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
88  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
89  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
90  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
91  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
92  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
93  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
94  * SUCH DAMAGE.
95  */
96 
php_do_open_temporary_file(const char * path,const char * pfx,char ** opened_path_p TSRMLS_DC)97 static int php_do_open_temporary_file(const char *path, const char *pfx, char **opened_path_p TSRMLS_DC)
98 {
99 	char *trailing_slash;
100 	char *opened_path;
101 	char cwd[MAXPATHLEN];
102 	cwd_state new_state;
103 	int fd = -1;
104 #ifndef HAVE_MKSTEMP
105 	int open_flags = O_CREAT | O_TRUNC | O_RDWR
106 #ifdef PHP_WIN32
107 		| _O_BINARY
108 #endif
109 		;
110 #endif
111 
112 	if (!path || !path[0]) {
113 		return -1;
114 	}
115 
116 #ifdef PHP_WIN32
117 	if (!php_win32_check_trailing_space(pfx, (const int)strlen(pfx))) {
118 		SetLastError(ERROR_INVALID_NAME);
119 		return -1;
120 	}
121 #endif
122 
123 	if (!VCWD_GETCWD(cwd, MAXPATHLEN)) {
124 		cwd[0] = '\0';
125 	}
126 
127 	new_state.cwd = strdup(cwd);
128 	new_state.cwd_length = strlen(cwd);
129 
130 	if (virtual_file_ex(&new_state, path, NULL, CWD_REALPATH TSRMLS_CC)) {
131 		free(new_state.cwd);
132 		return -1;
133 	}
134 
135 	if (IS_SLASH(new_state.cwd[new_state.cwd_length - 1])) {
136 		trailing_slash = "";
137 	} else {
138 		trailing_slash = "/";
139 	}
140 
141 	if (spprintf(&opened_path, 0, "%s%s%sXXXXXX", new_state.cwd, trailing_slash, pfx) >= MAXPATHLEN) {
142 		efree(opened_path);
143 		free(new_state.cwd);
144 		return -1;
145 	}
146 
147 #ifdef PHP_WIN32
148 
149 	if (GetTempFileName(new_state.cwd, pfx, 0, opened_path)) {
150 		/* Some versions of windows set the temp file to be read-only,
151 		 * which means that opening it will fail... */
152 		if (VCWD_CHMOD(opened_path, 0600)) {
153 			efree(opened_path);
154 			free(new_state.cwd);
155 			return -1;
156 		}
157 		fd = VCWD_OPEN_MODE(opened_path, open_flags, 0600);
158 	}
159 
160 #elif defined(HAVE_MKSTEMP)
161 	fd = mkstemp(opened_path);
162 #else
163 	if (mktemp(opened_path)) {
164 		fd = VCWD_OPEN(opened_path, open_flags);
165 	}
166 #endif
167 
168 	if (fd == -1 || !opened_path_p) {
169 		efree(opened_path);
170 	} else {
171 		*opened_path_p = opened_path;
172 	}
173 	free(new_state.cwd);
174 	return fd;
175 }
176 /* }}} */
177 
178 /* Cache the chosen temporary directory. */
179 static char* temporary_directory;
180 
php_shutdown_temporary_directory(void)181 PHPAPI void php_shutdown_temporary_directory(void)
182 {
183 	if (temporary_directory) {
184 		free(temporary_directory);
185 		temporary_directory = NULL;
186 	}
187 }
188 
189 /*
190  *  Determine where to place temporary files.
191  */
php_get_temporary_directory(void)192 PHPAPI const char* php_get_temporary_directory(void)
193 {
194 	/* Did we determine the temporary directory already? */
195 	if (temporary_directory) {
196 		return temporary_directory;
197 	}
198 
199 #ifdef PHP_WIN32
200 	/* We can't count on the environment variables TEMP or TMP,
201 	 * and so must make the Win32 API call to get the default
202 	 * directory for temporary files.  Note this call checks
203 	 * the environment values TMP and TEMP (in order) first.
204 	 */
205 	{
206 		char sTemp[MAX_PATH];
207 		DWORD len = GetTempPath(sizeof(sTemp),sTemp);
208 		assert(0 < len);  /* should *never* fail! */
209 		if (sTemp[len - 1] == DEFAULT_SLASH) {
210 			temporary_directory = zend_strndup(sTemp, len - 1);
211 		} else {
212 			temporary_directory = zend_strndup(sTemp, len);
213 		}
214 		return temporary_directory;
215 	}
216 #else
217 	/* On Unix use the (usual) TMPDIR environment variable. */
218 	{
219 		char* s = getenv("TMPDIR");
220 		if (s && *s) {
221 			int len = strlen(s);
222 
223 			if (s[len - 1] == DEFAULT_SLASH) {
224 				temporary_directory = zend_strndup(s, len - 1);
225 			} else {
226 				temporary_directory = zend_strndup(s, len);
227 			}
228 
229 			return temporary_directory;
230 		}
231 	}
232 #ifdef P_tmpdir
233 	/* Use the standard default temporary directory. */
234 	if (P_tmpdir) {
235 		temporary_directory = strdup(P_tmpdir);
236 		return temporary_directory;
237 	}
238 #endif
239 	/* Shouldn't ever(!) end up here ... last ditch default. */
240 	temporary_directory = strdup("/tmp");
241 	return temporary_directory;
242 #endif
243 }
244 
245 /* {{{ php_open_temporary_file
246  *
247  * Unlike tempnam(), the supplied dir argument takes precedence
248  * over the TMPDIR environment variable
249  * This function should do its best to return a file pointer to a newly created
250  * unique file, on every platform.
251  */
php_open_temporary_fd_ex(const char * dir,const char * pfx,char ** opened_path_p,zend_bool open_basedir_check TSRMLS_DC)252 PHPAPI int php_open_temporary_fd_ex(const char *dir, const char *pfx, char **opened_path_p, zend_bool open_basedir_check TSRMLS_DC)
253 {
254 	int fd;
255 	const char *temp_dir;
256 
257 	if (!pfx) {
258 		pfx = "tmp.";
259 	}
260 	if (opened_path_p) {
261 		*opened_path_p = NULL;
262 	}
263 
264 	if (!dir || *dir == '\0') {
265 def_tmp:
266 		temp_dir = php_get_temporary_directory();
267 
268 		if (temp_dir && *temp_dir != '\0' && (!open_basedir_check || !php_check_open_basedir(temp_dir TSRMLS_CC))) {
269 			return php_do_open_temporary_file(temp_dir, pfx, opened_path_p TSRMLS_CC);
270 		} else {
271 			return -1;
272 		}
273 	}
274 
275 	/* Try the directory given as parameter. */
276 	fd = php_do_open_temporary_file(dir, pfx, opened_path_p TSRMLS_CC);
277 	if (fd == -1) {
278 		/* Use default temporary directory. */
279 		goto def_tmp;
280 	}
281 	return fd;
282 }
283 
php_open_temporary_fd(const char * dir,const char * pfx,char ** opened_path_p TSRMLS_DC)284 PHPAPI int php_open_temporary_fd(const char *dir, const char *pfx, char **opened_path_p TSRMLS_DC)
285 {
286 	return php_open_temporary_fd_ex(dir, pfx, opened_path_p, 0 TSRMLS_CC);
287 }
288 
php_open_temporary_file(const char * dir,const char * pfx,char ** opened_path_p TSRMLS_DC)289 PHPAPI FILE *php_open_temporary_file(const char *dir, const char *pfx, char **opened_path_p TSRMLS_DC)
290 {
291 	FILE *fp;
292 	int fd = php_open_temporary_fd(dir, pfx, opened_path_p TSRMLS_CC);
293 
294 	if (fd == -1) {
295 		return NULL;
296 	}
297 
298 	fp = fdopen(fd, "r+b");
299 	if (fp == NULL) {
300 		close(fd);
301 	}
302 
303 	return fp;
304 }
305 /* }}} */
306 
307 /*
308  * Local variables:
309  * tab-width: 4
310  * c-basic-offset: 4
311  * End:
312  * vim600: sw=4 ts=4 fdm=marker
313  * vim<600: sw=4 ts=4
314  */
315