Annotation of src/usr.bin/file/fsmagic.c, Revision 1.12
1.12 ! chl 1: /* $OpenBSD: fsmagic.c,v 1.11 2005/05/18 03:11:18 jaredy Exp $ */
1.1 deraadt 2: /*
1.7 ian 3: * Copyright (c) Ian F. Darwin 1986-1995.
4: * Software written by Ian F. Darwin and others;
5: * maintained 1995-present by Christos Zoulas and others.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice immediately at the beginning of the file, without modification,
12: * this list of conditions, and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21: * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
1.1 deraadt 28: */
1.10 tedu 29: /*
30: * fsmagic - magic based on filesystem info - directory, special files, etc.
31: */
1.1 deraadt 32:
1.10 tedu 33: #include "file.h"
34: #include "magic.h"
1.1 deraadt 35: #include <string.h>
1.10 tedu 36: #ifdef HAVE_UNISTD_H
1.1 deraadt 37: #include <unistd.h>
1.10 tedu 38: #endif
1.1 deraadt 39: #include <stdlib.h>
1.10 tedu 40: #include <sys/stat.h>
41: /* Since major is a function on SVR4, we cannot use `ifndef major'. */
42: #ifdef MAJOR_IN_MKDEV
43: # include <sys/mkdev.h>
44: # define HAVE_MAJOR
45: #endif
46: #ifdef MAJOR_IN_SYSMACROS
47: # include <sys/sysmacros.h>
48: # define HAVE_MAJOR
49: #endif
50: #ifdef major /* Might be defined in sys/types.h. */
51: # define HAVE_MAJOR
1.3 millert 52: #endif
1.10 tedu 53:
54: #ifndef HAVE_MAJOR
55: # define major(dev) (((dev) >> 8) & 0xff)
56: # define minor(dev) ((dev) & 0xff)
1.1 deraadt 57: #endif
1.10 tedu 58: #undef HAVE_MAJOR
1.1 deraadt 59:
60: #ifndef lint
1.12 ! chl 61: FILE_RCSID("@(#)$Id: fsmagic.c,v 1.11 2005/05/18 03:11:18 jaredy Exp $")
1.1 deraadt 62: #endif /* lint */
63:
1.10 tedu 64: protected int
65: file_fsmagic(struct magic_set *ms, const char *fn, struct stat *sb)
1.1 deraadt 66: {
67: int ret = 0;
1.10 tedu 68: #ifdef S_IFLNK
69: char buf[BUFSIZ+4];
70: int nch;
71: struct stat tstatbuf;
72: #endif
73:
74: if (fn == NULL)
75: return 0;
1.1 deraadt 76:
77: /*
78: * Fstat is cheaper but fails for files you don't have read perms on.
79: * On 4.2BSD and similar systems, use lstat() to identify symlinks.
80: */
81: #ifdef S_IFLNK
1.10 tedu 82: if ((ms->flags & MAGIC_SYMLINK) == 0)
1.1 deraadt 83: ret = lstat(fn, sb);
84: else
85: #endif
86: ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
87:
88: if (ret) {
1.10 tedu 89: if (ms->flags & MAGIC_ERROR) {
90: file_error(ms, errno, "cannot stat `%s'", fn);
91: return -1;
92: }
1.12 ! chl 93: if (file_printf(ms, "cannot open `%s' (%s)",
! 94: fn, strerror(errno)) == -1)
1.10 tedu 95: return -1;
1.1 deraadt 96: return 1;
97: }
98:
1.10 tedu 99: if ((ms->flags & MAGIC_MIME) != 0) {
100: if ((sb->st_mode & S_IFMT) != S_IFREG) {
101: if (file_printf(ms, "application/x-not-regular-file")
102: == -1)
103: return -1;
104: return 1;
105: }
106: }
107: else {
108: #ifdef S_ISUID
109: if (sb->st_mode & S_ISUID)
110: if (file_printf(ms, "setuid ") == -1)
111: return -1;
112: #endif
113: #ifdef S_ISGID
114: if (sb->st_mode & S_ISGID)
115: if (file_printf(ms, "setgid ") == -1)
116: return -1;
117: #endif
118: #ifdef S_ISVTX
119: if (sb->st_mode & S_ISVTX)
120: if (file_printf(ms, "sticky ") == -1)
121: return -1;
122: #endif
123: }
1.1 deraadt 124:
125: switch (sb->st_mode & S_IFMT) {
126: case S_IFDIR:
1.10 tedu 127: if (file_printf(ms, "directory") == -1)
128: return -1;
1.1 deraadt 129: return 1;
1.10 tedu 130: #ifdef S_IFCHR
1.1 deraadt 131: case S_IFCHR:
1.10 tedu 132: /*
133: * If -s has been specified, treat character special files
134: * like ordinary files. Otherwise, just report that they
135: * are block special files and go on to the next file.
136: */
137: if ((ms->flags & MAGIC_DEVICES) != 0)
138: break;
139: #ifdef HAVE_ST_RDEV
140: # ifdef dv_unit
141: if (file_printf(ms, "character special (%d/%d/%d)",
142: major(sb->st_rdev), dv_unit(sb->st_rdev),
143: dv_subunit(sb->st_rdev)) == -1)
144: return -1;
145: # else
146: if (file_printf(ms, "character special (%ld/%ld)",
147: (long) major(sb->st_rdev), (long) minor(sb->st_rdev)) == -1)
148: return -1;
149: # endif
150: #else
151: if (file_printf(ms, "character special") == -1)
152: return -1;
153: #endif
1.1 deraadt 154: return 1;
1.10 tedu 155: #endif
156: #ifdef S_IFBLK
1.1 deraadt 157: case S_IFBLK:
1.10 tedu 158: /*
159: * If -s has been specified, treat block special files
160: * like ordinary files. Otherwise, just report that they
161: * are block special files and go on to the next file.
162: */
163: if ((ms->flags & MAGIC_DEVICES) != 0)
164: break;
165: #ifdef HAVE_ST_RDEV
166: # ifdef dv_unit
167: if (file_printf(ms, "block special (%d/%d/%d)",
168: major(sb->st_rdev), dv_unit(sb->st_rdev),
169: dv_subunit(sb->st_rdev)) == -1)
170: return -1;
171: # else
172: if (file_printf(ms, "block special (%ld/%ld)",
173: (long)major(sb->st_rdev), (long)minor(sb->st_rdev)) == -1)
174: return -1;
175: # endif
176: #else
177: if (file_printf(ms, "block special") == -1)
178: return -1;
179: #endif
1.1 deraadt 180: return 1;
1.10 tedu 181: #endif
1.1 deraadt 182: /* TODO add code to handle V7 MUX and Blit MUX files */
183: #ifdef S_IFIFO
184: case S_IFIFO:
1.12 ! chl 185: if((ms->flags & MAGIC_DEVICES) != 0)
! 186: break;
1.10 tedu 187: if (file_printf(ms, "fifo (named pipe)") == -1)
188: return -1;
189: return 1;
190: #endif
191: #ifdef S_IFDOOR
192: case S_IFDOOR:
193: if (file_printf(ms, "door") == -1)
194: return -1;
1.1 deraadt 195: return 1;
196: #endif
197: #ifdef S_IFLNK
198: case S_IFLNK:
1.10 tedu 199: if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
200: if (ms->flags & MAGIC_ERROR) {
201: file_error(ms, errno, "unreadable symlink `%s'",
202: fn);
203: return -1;
1.1 deraadt 204: }
1.10 tedu 205: if (file_printf(ms,
206: "unreadable symlink `%s' (%s)", fn,
207: strerror(errno)) == -1)
208: return -1;
209: return 1;
210: }
211: buf[nch] = '\0'; /* readlink(2) forgets this */
1.1 deraadt 212:
1.10 tedu 213: /* If broken symlink, say so and quit early. */
214: if (*buf == '/') {
215: if (stat(buf, &tstatbuf) < 0) {
216: if (ms->flags & MAGIC_ERROR) {
217: file_error(ms, errno,
218: "broken symbolic link to `%s'", buf);
219: return -1;
220: }
221: if (file_printf(ms, "broken symbolic link to `%s'",
222: buf) == -1)
223: return -1;
224: return 1;
225: }
226: }
227: else {
228: char *tmp;
229: char buf2[BUFSIZ+BUFSIZ+4];
1.1 deraadt 230:
1.10 tedu 231: if ((tmp = strrchr(fn, '/')) == NULL) {
1.1 deraadt 232: tmp = buf; /* in current directory anyway */
1.10 tedu 233: } else {
234: if (tmp - fn + 1 > BUFSIZ) {
235: if (ms->flags & MAGIC_ERROR) {
236: file_error(ms, 0,
237: "path too long: `%s'", buf);
238: return -1;
239: }
240: if (file_printf(ms,
241: "path too long: `%s'", fn) == -1)
242: return -1;
243: return 1;
244: }
245: (void)strlcpy(buf2, fn, sizeof buf2); /* take dir part */
246: buf2[tmp - fn + 1] = '\0';
247: (void)strlcat(buf2, buf, sizeof buf2); /* plus (rel) link */
1.1 deraadt 248: tmp = buf2;
1.10 tedu 249: }
250: if (stat(tmp, &tstatbuf) < 0) {
251: if (ms->flags & MAGIC_ERROR) {
252: file_error(ms, errno,
253: "broken symbolic link to `%s'",
254: buf);
255: return -1;
256: }
257: if (file_printf(ms,
258: "broken symbolic link to `%s'", buf) == -1)
259: return -1;
1.1 deraadt 260: return 1;
1.10 tedu 261: }
262: }
1.1 deraadt 263:
1.10 tedu 264: /* Otherwise, handle it. */
265: if ((ms->flags & MAGIC_SYMLINK) != 0) {
266: const char *p;
267: ms->flags &= MAGIC_SYMLINK;
268: p = magic_file(ms, buf);
269: ms->flags |= MAGIC_SYMLINK;
270: return p != NULL ? 1 : -1;
271: } else { /* just print what it points to */
272: if (file_printf(ms, "symbolic link to `%s'",
273: buf) == -1)
274: return -1;
1.1 deraadt 275: }
1.10 tedu 276: return 1;
1.1 deraadt 277: #endif
278: #ifdef S_IFSOCK
279: #ifndef __COHERENT__
280: case S_IFSOCK:
1.10 tedu 281: if (file_printf(ms, "socket") == -1)
282: return -1;
1.1 deraadt 283: return 1;
284: #endif
285: #endif
286: case S_IFREG:
287: break;
288: default:
1.10 tedu 289: file_error(ms, 0, "invalid mode 0%o", sb->st_mode);
290: return -1;
1.1 deraadt 291: /*NOTREACHED*/
292: }
293:
294: /*
295: * regular file, check next possibility
1.10 tedu 296: *
297: * If stat() tells us the file has zero length, report here that
298: * the file is empty, so we can skip all the work of opening and
299: * reading the file.
300: * But if the -s option has been given, we skip this optimization,
301: * since on some systems, stat() reports zero size for raw disk
302: * partitions. (If the block special device really has zero length,
303: * the fact that it is empty will be detected and reported correctly
304: * when we read the file.)
1.1 deraadt 305: */
1.10 tedu 306: if ((ms->flags & MAGIC_DEVICES) == 0 && sb->st_size == 0) {
307: if (file_printf(ms, (ms->flags & MAGIC_MIME) ?
308: "application/x-empty" : "empty") == -1)
309: return -1;
1.1 deraadt 310: return 1;
311: }
312: return 0;
313: }
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