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 1.71 2013/12/01 18:01:07 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
57 #ifndef HAVE_MAJOR
58 # define major(dev) (((dev) >> 8) & 0xff)
59 # define minor(dev) ((dev) & 0xff)
60 #endif
61 #undef HAVE_MAJOR
62
63 #ifdef PHP_WIN32
64
65 # undef S_IFIFO
66 #endif
67
68
69 #ifndef S_ISDIR
70 #define S_ISDIR(mode) ((mode) & _S_IFDIR)
71 #endif
72
73 #ifndef S_ISREG
74 #define S_ISREG(mode) ((mode) & _S_IFREG)
75 #endif
76
77 private int
78 handle_mime(struct magic_set *ms, int mime, const char *str)
79 {
80 if ((mime & MAGIC_MIME_TYPE)) {
81 if (file_printf(ms, "inode/%s", str) == -1)
82 return -1;
83 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms,
84 "; charset=") == -1)
85 return -1;
86 }
87 if ((mime & MAGIC_MIME_ENCODING) && file_printf(ms, "binary") == -1)
88 return -1;
89 return 0;
90 }
91
92 protected int
93 file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb, php_stream *stream)
94 {
95 int ret, did = 0;
96 int mime = ms->flags & MAGIC_MIME;
97 TSRMLS_FETCH();
98
99 if (ms->flags & MAGIC_APPLE)
100 return 0;
101
102 if (fn == NULL && !stream) {
103 return 0;
104 }
105
106 #define COMMA (did++ ? ", " : "")
107
108 if (stream) {
109 php_stream_statbuf ssb;
110 if (php_stream_stat(stream, &ssb) < 0) {
111 if (ms->flags & MAGIC_ERROR) {
112 file_error(ms, errno, "cannot stat `%s'", fn);
113 return -1;
114 }
115 return 0;
116 }
117 memcpy(sb, &ssb.sb, sizeof(struct stat));
118 } else {
119 if (php_sys_stat(fn, sb) != 0) {
120 if (ms->flags & MAGIC_ERROR) {
121 file_error(ms, errno, "cannot stat `%s'", fn);
122 return -1;
123 }
124 return 0;
125 }
126 }
127
128 ret = 1;
129 if (!mime) {
130 #ifdef S_ISUID
131 if (sb->st_mode & S_ISUID)
132 if (file_printf(ms, "%ssetuid", COMMA) == -1)
133 return -1;
134 #endif
135 #ifdef S_ISGID
136 if (sb->st_mode & S_ISGID)
137 if (file_printf(ms, "%ssetgid", COMMA) == -1)
138 return -1;
139 #endif
140 #ifdef S_ISVTX
141 if (sb->st_mode & S_ISVTX)
142 if (file_printf(ms, "%ssticky", COMMA) == -1)
143 return -1;
144 #endif
145 }
146
147 switch (sb->st_mode & S_IFMT) {
148 #ifndef PHP_WIN32
149 # ifdef S_IFCHR
150 case S_IFCHR:
151 /*
152 * If -s has been specified, treat character special files
153 * like ordinary files. Otherwise, just report that they
154 * are block special files and go on to the next file.
155 */
156 if ((ms->flags & MAGIC_DEVICES) != 0) {
157 ret = 0;
158 break;
159 }
160 if (mime) {
161 if (handle_mime(ms, mime, "chardevice") == -1)
162 return -1;
163 } else {
164 # ifdef HAVE_STAT_ST_RDEV
165 # ifdef dv_unit
166 if (file_printf(ms, "%scharacter special (%d/%d/%d)",
167 COMMA, major(sb->st_rdev), dv_unit(sb->st_rdev),
168 dv_subunit(sb->st_rdev)) == -1)
169 return -1;
170 # else
171 if (file_printf(ms, "%scharacter special (%ld/%ld)",
172 COMMA, (long)major(sb->st_rdev),
173 (long)minor(sb->st_rdev)) == -1)
174 return -1;
175 # endif
176 #else
177 if (file_printf(ms, "%scharacter special", COMMA) == -1)
178 return -1;
179 #endif
180 }
181 return 1;
182 # endif
183 #endif
184
185 #ifdef S_IFIFO
186 case S_IFIFO:
187 if((ms->flags & MAGIC_DEVICES) != 0)
188 break;
189 if (mime) {
190 if (handle_mime(ms, mime, "fifo") == -1)
191 return -1;
192 } else if (file_printf(ms, "%sfifo (named pipe)", COMMA) == -1)
193 return -1;
194 break;
195 #endif
196 #ifdef S_IFDOOR
197 case S_IFDOOR:
198 if (mime) {
199 if (handle_mime(ms, mime, "door") == -1)
200 return -1;
201 } else if (file_printf(ms, "%sdoor", COMMA) == -1)
202 return -1;
203 break;
204 #endif
205 #ifdef S_IFLNK
206 case S_IFLNK:
207 /* stat is used, if it made here then the link is broken */
208 if (ms->flags & MAGIC_ERROR) {
209 file_error(ms, errno, "unreadable symlink `%s'", fn);
210 return -1;
211 }
212 return 1;
213 #endif
214
215 #ifdef S_IFSOCK
216 #ifndef __COHERENT__
217 case S_IFSOCK:
218 if (mime) {
219 if (handle_mime(ms, mime, "socket") == -1)
220 return -1;
221 } else if (file_printf(ms, "%ssocket", COMMA) == -1)
222 return -1;
223 break;
224 #endif
225 #endif
226 case S_IFREG:
227 /*
228 * regular file, check next possibility
229 *
230 * If stat() tells us the file has zero length, report here that
231 * the file is empty, so we can skip all the work of opening and
232 * reading the file.
233 * But if the -s option has been given, we skip this
234 * optimization, since on some systems, stat() reports zero
235 * size for raw disk partitions. (If the block special device
236 * really has zero length, the fact that it is empty will be
237 * detected and reported correctly when we read the file.)
238 */
239 if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
240 if (mime) {
241 if (handle_mime(ms, mime, "x-empty") == -1)
242 return -1;
243 } else if (file_printf(ms, "%sempty", COMMA) == -1)
244 return -1;
245 break;
246 }
247 ret = 0;
248 break;
249
250 default:
251 file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
252 return -1;
253 /*NOTREACHED*/
254 }
255
256 return ret;
257 }