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1.2 ! deraadt 1: /* $OpenBSD: fsmagic.c,v 1.1.1.1 1995/10/18 08:45:09 deraadt Exp $ */
1.1 deraadt 2: /*
3: * fsmagic - magic based on filesystem info - directory, special files, etc.
4: *
5: * Copyright (c) Ian F. Darwin, 1987.
6: * Written by Ian F. Darwin.
7: *
8: * This software is not subject to any license of the American Telephone
9: * and Telegraph Company or of the Regents of the University of California.
10: *
11: * Permission is granted to anyone to use this software for any purpose on
12: * any computer system, and to alter it and redistribute it freely, subject
13: * to the following restrictions:
14: *
15: * 1. The author is not responsible for the consequences of use of this
16: * software, no matter how awful, even if they arise from flaws in it.
17: *
18: * 2. The origin of this software must not be misrepresented, either by
19: * explicit claim or by omission. Since few users ever read sources,
20: * credits must appear in the documentation.
21: *
22: * 3. Altered versions must be plainly marked as such, and must not be
23: * misrepresented as being the original software. Since few users
24: * ever read sources, credits must appear in the documentation.
25: *
26: * 4. This notice may not be removed or altered.
27: */
28:
29: #include <stdio.h>
30: #include <string.h>
31: #include <sys/types.h>
32: #include <sys/stat.h>
33: #include <unistd.h>
34: #include <stdlib.h>
35: #ifndef major /* if `major' not defined in types.h, */
36: #include <sys/sysmacros.h> /* try this one. */
37: #endif
38: #ifndef major /* still not defined? give up, manual intervention needed */
39: /* If cc tries to compile this, read and act on it. */
40: /* On most systems cpp will discard it automatically */
41: Congratulations, you have found a portability bug.
42: Please grep /usr/include/sys and edit the above #include
43: to point at the file that defines the "major" macro.
44: #endif /*major*/
45:
46: #include "file.h"
47:
48: #ifndef lint
1.2 ! deraadt 49: static char *moduleid = "$OpenBSD$";
1.1 deraadt 50: #endif /* lint */
51:
52: int
53: fsmagic(fn, sb)
54: const char *fn;
55: struct stat *sb;
56: {
57: int ret = 0;
58:
59: /*
60: * Fstat is cheaper but fails for files you don't have read perms on.
61: * On 4.2BSD and similar systems, use lstat() to identify symlinks.
62: */
63: #ifdef S_IFLNK
64: if (!lflag)
65: ret = lstat(fn, sb);
66: else
67: #endif
68: ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
69:
70: if (ret) {
71: ckfprintf(stdout,
72: /* Yes, I do mean stdout. */
73: /* No \n, caller will provide. */
74: "can't stat `%s' (%s).", fn, strerror(errno));
75: return 1;
76: }
77:
78: if (sb->st_mode & S_ISUID) ckfputs("setuid ", stdout);
79: if (sb->st_mode & S_ISGID) ckfputs("setgid ", stdout);
80: if (sb->st_mode & S_ISVTX) ckfputs("sticky ", stdout);
81:
82: switch (sb->st_mode & S_IFMT) {
83: case S_IFDIR:
84: ckfputs("directory", stdout);
85: return 1;
86: case S_IFCHR:
87: (void) printf("character special (%d/%d)",
88: major(sb->st_rdev), minor(sb->st_rdev));
89: return 1;
90: case S_IFBLK:
91: (void) printf("block special (%d/%d)",
92: major(sb->st_rdev), minor(sb->st_rdev));
93: return 1;
94: /* TODO add code to handle V7 MUX and Blit MUX files */
95: #ifdef S_IFIFO
96: case S_IFIFO:
97: ckfputs("fifo (named pipe)", stdout);
98: return 1;
99: #endif
100: #ifdef S_IFLNK
101: case S_IFLNK:
102: {
103: char buf[BUFSIZ+4];
104: register int nch;
105: struct stat tstatbuf;
106:
107: if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
108: ckfprintf(stdout, "unreadable symlink (%s).",
109: strerror(errno));
110: return 1;
111: }
112: buf[nch] = '\0'; /* readlink(2) forgets this */
113:
114: /* If broken symlink, say so and quit early. */
115: if (*buf == '/') {
116: if (stat(buf, &tstatbuf) < 0) {
117: ckfprintf(stdout,
118: "broken symbolic link to %s", buf);
119: return 1;
120: }
121: }
122: else {
123: char *tmp;
124: char buf2[BUFSIZ+BUFSIZ+4];
125:
126: if ((tmp = strrchr(fn, '/')) == NULL) {
127: tmp = buf; /* in current directory anyway */
128: }
129: else {
130: strcpy (buf2, fn); /* take directory part */
131: buf2[tmp-fn+1] = '\0';
132: strcat (buf2, buf); /* plus (relative) symlink */
133: tmp = buf2;
134: }
135: if (stat(tmp, &tstatbuf) < 0) {
136: ckfprintf(stdout,
137: "broken symbolic link to %s", buf);
138: return 1;
139: }
140: }
141:
142: /* Otherwise, handle it. */
143: if (lflag) {
144: process(buf, strlen(buf));
145: return 1;
146: } else { /* just print what it points to */
147: ckfputs("symbolic link to ", stdout);
148: ckfputs(buf, stdout);
149: }
150: }
151: return 1;
152: #endif
153: #ifdef S_IFSOCK
154: #ifndef __COHERENT__
155: case S_IFSOCK:
156: ckfputs("socket", stdout);
157: return 1;
158: #endif
159: #endif
160: case S_IFREG:
161: break;
162: default:
163: error("invalid mode 0%o.\n", sb->st_mode);
164: /*NOTREACHED*/
165: }
166:
167: /*
168: * regular file, check next possibility
169: */
170: if (sb->st_size == 0) {
171: ckfputs("empty", stdout);
172: return 1;
173: }
174: return 0;
175: }
176: