179 lines
4.5 KiB
C
179 lines
4.5 KiB
C
/*
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* fsmagic - magic based on filesystem info - directory, special files, etc.
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*
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* Copyright (c) Ian F. Darwin, 1987.
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* Written by Ian F. Darwin.
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*
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* This software is not subject to any license of the American Telephone
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* and Telegraph Company or of the Regents of the University of California.
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*
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* Permission is granted to anyone to use this software for any purpose on
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* any computer system, and to alter it and redistribute it freely, subject
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* to the following restrictions:
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*
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* 1. The author is not responsible for the consequences of use of this
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* software, no matter how awful, even if they arise from flaws in it.
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*
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* 2. The origin of this software must not be misrepresented, either by
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* explicit claim or by omission. Since few users ever read sources,
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* credits must appear in the documentation.
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*
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* 3. Altered versions must be plainly marked as such, and must not be
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* misrepresented as being the original software. Since few users
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* ever read sources, credits must appear in the documentation.
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*
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* 4. This notice may not be removed or altered.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <err.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#ifndef major
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# if defined(__SVR4) || defined(_SVR4_SOURCE)
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# include <sys/mkdev.h>
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# endif
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#endif
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#ifndef major /* if `major' not defined in types.h, */
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#include <sys/sysmacros.h> /* try this one. */
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#endif
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#ifndef major /* still not defined? give up, manual intervention needed */
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/* If cc tries to compile this, read and act on it. */
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/* On most systems cpp will discard it automatically */
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Congratulations, you have found a portability bug.
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Please grep /usr/include/sys and edit the above #include
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to point at the file that defines the "major" macro.
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#endif /*major*/
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#include "file.h"
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int
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fsmagic(fn, sb)
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const char *fn;
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struct stat *sb;
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{
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int ret = 0;
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/*
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* Fstat is cheaper but fails for files you don't have read perms on.
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* On 4.2BSD and similar systems, use lstat() to identify symlinks.
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*/
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#ifdef S_IFLNK
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if (!lflag)
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ret = lstat(fn, sb);
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else
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#endif
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ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
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if (ret) {
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ckfprintf(stdout,
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/* Yes, I do mean stdout. */
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/* No \n, caller will provide. */
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"can't stat `%s': %s.", fn, strerror(errno));
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return 1;
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}
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if (sb->st_mode & S_ISUID) ckfputs("setuid ", stdout);
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if (sb->st_mode & S_ISGID) ckfputs("setgid ", stdout);
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if (sb->st_mode & S_ISVTX) ckfputs("sticky ", stdout);
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switch (sb->st_mode & S_IFMT) {
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case S_IFDIR:
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ckfputs("directory", stdout);
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return 1;
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case S_IFCHR:
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(void) printf("character special (%ld/%ld)",
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(long) major(sb->st_rdev), (long) minor(sb->st_rdev));
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return 1;
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case S_IFBLK:
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(void) printf("block special (%ld/%ld)",
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(long) major(sb->st_rdev), (long) minor(sb->st_rdev));
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return 1;
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/* TODO add code to handle V7 MUX and Blit MUX files */
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#ifdef S_IFIFO
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case S_IFIFO:
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ckfputs("fifo (named pipe)", stdout);
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return 1;
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#endif
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#ifdef S_IFLNK
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case S_IFLNK:
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{
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char buf[BUFSIZ+4];
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register int nch;
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struct stat tstatbuf;
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if ((nch = readlink(fn, buf, BUFSIZ-1)) <= 0) {
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ckfprintf(stdout, "unreadable symlink: %s.",
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strerror(errno));
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return 1;
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}
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buf[nch] = '\0'; /* readlink(2) forgets this */
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/* If broken symlink, say so and quit early. */
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if (*buf == '/') {
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if (stat(buf, &tstatbuf) < 0) {
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ckfprintf(stdout,
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"broken symbolic link to %s", buf);
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return 1;
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}
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}
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else {
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char *tmp;
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char buf2[BUFSIZ+BUFSIZ+4];
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if ((tmp = strrchr(fn, '/')) == NULL) {
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tmp = buf; /* in current directory anyway */
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}
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else {
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strcpy (buf2, fn); /* take directory part */
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buf2[tmp-fn+1] = '\0';
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strcat (buf2, buf); /* plus (relative) symlink */
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tmp = buf2;
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}
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if (stat(tmp, &tstatbuf) < 0) {
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ckfprintf(stdout,
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"broken symbolic link to %s", buf);
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return 1;
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}
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}
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/* Otherwise, handle it. */
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if (lflag) {
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process(buf, strlen(buf));
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return 1;
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} else { /* just print what it points to */
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ckfputs("symbolic link to ", stdout);
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ckfputs(buf, stdout);
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}
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}
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return 1;
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#endif
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#ifdef S_IFSOCK
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#ifndef __COHERENT__
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case S_IFSOCK:
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ckfputs("socket", stdout);
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return 1;
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#endif
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#endif
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case S_IFREG:
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break;
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default:
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err(1, "invalid mode 0%o", sb->st_mode);
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/*NOTREACHED*/
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}
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/*
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* regular file, check next possibility
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*/
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if (sb->st_size == 0) {
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ckfputs("empty", stdout);
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return 1;
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}
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return 0;
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}
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