1 /*
2 * Copyright (c) Ian F. Darwin 1986-1995.
3 * Software written by Ian F. Darwin and others;
4 * maintained 1995-present by Christos Zoulas and others.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice immediately at the beginning of the file, without modification,
11 * this list of conditions, and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 /*
29 * fsmagic - magic based on filesystem info - directory, special files, etc.
30 */
31
32 #include "file.h"
33
34 #ifndef lint
35 FILE_RCSID("@(#)$File: fsmagic.c,v 1.74 2014/10/13 20:21:49 christos Exp $")
36 #endif /* lint */
37
38 #include "magic.h"
39 #include <string.h>
40 #ifdef HAVE_UNISTD_H
41 #include <unistd.h>
42 #endif
43 #include <stdlib.h>
44 /* Since major is a function on SVR4, we cannot use `ifndef major'. */
45 #ifdef MAJOR_IN_MKDEV
46 # include <sys/mkdev.h>
47 # define HAVE_MAJOR
48 #endif
49 #ifdef MAJOR_IN_SYSMACROS
50 # include <sys/sysmacros.h>
51 # define HAVE_MAJOR
52 #endif
53 #ifdef major /* Might be defined in sys/types.h. */
54 # define HAVE_MAJOR
55 #endif
56 #ifdef WIN32
57 # define WIN32_LEAN_AND_MEAN
58 # include <windows.h>
59 #endif
60
61 #ifndef HAVE_MAJOR
62 # define major(dev) (((dev) >> 8) & 0xff)
63 # define minor(dev) ((dev) & 0xff)
64 #endif
65 #undef HAVE_MAJOR
66
67 #ifdef PHP_WIN32
68
69 # undef S_IFIFO
70 #endif
71
72
73 #ifndef S_ISDIR
74 #define S_ISDIR(mode) ((mode) & _S_IFDIR)
75 #endif
76
77 #ifndef S_ISREG
78 #define S_ISREG(mode) ((mode) & _S_IFREG)
79 #endif
80
81 private int
82 handle_mime(struct magic_set *ms, int mime, const char *str)
83 {
84 if ((mime & MAGIC_MIME_TYPE)) {
85 if (file_printf(ms, "inode/%s", str) == -1)
86 return -1;
87 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms,
88 "; charset=") == -1)
89 return -1;
90 }
91 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1)
92 return -1;
93 return 0;
94 }
95
96 protected int
97 file_fsmagic(struct magic_set *ms, const char *fn, zend_stat_t *sb, php_stream *stream)
98 {
99 int ret, did = 0;
100 int mime = ms->flags & MAGIC_MIME;
101
102 if (ms->flags & MAGIC_APPLE)
103 return 0;
104
105 if (fn == NULL && !stream) {
106 return 0;
107 }
108
109 #define COMMA (did++ ? ", " : "")
110
111 if (stream) {
112 php_stream_statbuf ssb;
113 if (php_stream_stat(stream, &ssb) < 0) {
114 if (ms->flags & MAGIC_ERROR) {
115 file_error(ms, errno, "cannot stat `%s'", fn);
116 return -1;
117 }
118 return 0;
119 }
120 memcpy(sb, &ssb.sb, sizeof(struct stat));
121 } else {
122 if (php_sys_stat(fn, sb) != 0) {
123 if (ms->flags & MAGIC_ERROR) {
124 file_error(ms, errno, "cannot stat `%s'", fn);
125 return -1;
126 }
127 return 0;
128 }
129 }
130
131 ret = 1;
132 if (!mime) {
133 #ifdef S_ISUID
134 if (sb->st_mode & S_ISUID)
135 if (file_printf(ms, "%ssetuid", COMMA) == -1)
136 return -1;
137 #endif
138 #ifdef S_ISGID
139 if (sb->st_mode & S_ISGID)
140 if (file_printf(ms, "%ssetgid", COMMA) == -1)
141 return -1;
142 #endif
143 #ifdef S_ISVTX
144 if (sb->st_mode & S_ISVTX)
145 if (file_printf(ms, "%ssticky", COMMA) == -1)
146 return -1;
147 #endif
148 }
149
150 switch (sb->st_mode & S_IFMT) {
151 #ifndef PHP_WIN32
152 # ifdef S_IFCHR
153 case S_IFCHR:
154 /*
155 * If -s has been specified, treat character special files
156 * like ordinary files. Otherwise, just report that they
157 * are block special files and go on to the next file.
158 */
159 if ((ms->flags & MAGIC_DEVICES) != 0) {
160 ret = 0;
161 break;
162 }
163 if (mime) {
164 if (handle_mime(ms, mime, "chardevice") == -1)
165 return -1;
166 } else {
167 # ifdef HAVE_STAT_ST_RDEV
168 # ifdef dv_unit
169 if (file_printf(ms, "%scharacter special (%d/%d/%d)",
170 COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
171 dv_subunit(sb->st_rdev)) == -1)
172 return -1;
173 # else
174 if (file_printf(ms, "%scharacter special (%ld/%ld)",
175 COMMA, (long)major(sb->st_rdev),
176 (long)minor(sb->st_rdev)) == -1)
177 return -1;
178 # endif
179 #else
180 if (file_printf(ms, "%scharacter special", COMMA) == -1)
181 return -1;
182 #endif
183 }
184 return 1;
185 # endif
186 #endif
187
188 #ifdef S_IFIFO
189 case S_IFIFO:
190 if((ms->flags & MAGIC_DEVICES) != 0)
191 break;
192 if (mime) {
193 if (handle_mime(ms, mime, "fifo") == -1)
194 return -1;
195 } else if (file_printf(ms, "%sfifo (named pipe)", COMMA) == -1)
196 return -1;
197 break;
198 #endif
199 #ifdef S_IFDOOR
200 case S_IFDOOR:
201 if (mime) {
202 if (handle_mime(ms, mime, "door") == -1)
203 return -1;
204 } else if (file_printf(ms, "%sdoor", COMMA) == -1)
205 return -1;
206 break;
207 #endif
208 #ifdef S_IFLNK
209 case S_IFLNK:
210 /* stat is used, if it made here then the link is broken */
211 if (ms->flags & MAGIC_ERROR) {
212 file_error(ms, errno, "unreadable symlink `%s'", fn);
213 return -1;
214 }
215 return 1;
216 #endif
217
218 #ifdef S_IFSOCK
219 #ifndef __COHERENT__
220 case S_IFSOCK:
221 if (mime) {
222 if (handle_mime(ms, mime, "socket") == -1)
223 return -1;
224 } else if (file_printf(ms, "%ssocket", COMMA) == -1)
225 return -1;
226 break;
227 #endif
228 #endif
229 case S_IFREG:
230 /*
231 * regular file, check next possibility
232 *
233 * If stat() tells us the file has zero length, report here that
234 * the file is empty, so we can skip all the work of opening and
235 * reading the file.
236 * But if the -s option has been given, we skip this
237 * optimization, since on some systems, stat() reports zero
238 * size for raw disk partitions. (If the block special device
239 * really has zero length, the fact that it is empty will be
240 * detected and reported correctly when we read the file.)
241 */
242 if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
243 if (mime) {
244 if (handle_mime(ms, mime, "x-empty") == -1)
245 return -1;
246 } else if (file_printf(ms, "%sempty", COMMA) == -1)
247 return -1;
248 break;
249 }
250 ret = 0;
251 break;
252
253 default:
254 file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
255 return -1;
256 /*NOTREACHED*/
257 }
258
259 return ret;
260 }