399 lines
8.0 KiB
C
399 lines
8.0 KiB
C
/*
|
|
* file - find type of a file or files - main program.
|
|
*
|
|
* Copyright (c) Ian F. Darwin, 1987.
|
|
* Written by Ian F. Darwin.
|
|
*
|
|
* This software is not subject to any license of the American Telephone
|
|
* and Telegraph Company or of the Regents of the University of California.
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose on
|
|
* any computer system, and to alter it and redistribute it freely, subject
|
|
* to the following restrictions:
|
|
*
|
|
* 1. The author is not responsible for the consequences of use of this
|
|
* software, no matter how awful, even if they arise from flaws in it.
|
|
*
|
|
* 2. The origin of this software must not be misrepresented, either by
|
|
* explicit claim or by omission. Since few users ever read sources,
|
|
* credits must appear in the documentation.
|
|
*
|
|
* 3. Altered versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software. Since few users
|
|
* ever read sources, credits must appear in the documentation.
|
|
*
|
|
* 4. This notice may not be removed or altered.
|
|
*/
|
|
#ifndef lint
|
|
static char *moduleid =
|
|
"@(#)$Id: file.c,v 1.7 1997/03/18 19:37:18 mpp Exp $";
|
|
#endif /* lint */
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/param.h> /* for MAXPATHLEN */
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h> /* for open() */
|
|
#if (__COHERENT__ >= 0x420)
|
|
# include <sys/utime.h>
|
|
#else
|
|
# ifdef USE_UTIMES
|
|
# include <sys/time.h>
|
|
# else
|
|
# include <utime.h>
|
|
# endif
|
|
#endif
|
|
#include <unistd.h> /* for read() */
|
|
|
|
#include <netinet/in.h> /* for byte swapping */
|
|
|
|
#include "patchlevel.h"
|
|
#include "file.h"
|
|
|
|
#ifdef S_IFLNK
|
|
# define USAGE "Usage: %s [-vczL] [-f namefile] [-m magicfiles] file...\n"
|
|
#else
|
|
# define USAGE "Usage: %s [-vcz] [-f namefile] [-m magicfiles] file...\n"
|
|
#endif
|
|
|
|
#ifndef MAGIC
|
|
# define MAGIC "/etc/magic"
|
|
#endif
|
|
|
|
int /* Global command-line options */
|
|
debug = 0, /* debugging */
|
|
lflag = 0, /* follow Symlinks (BSD only) */
|
|
zflag = 0; /* follow (uncompress) compressed files */
|
|
|
|
int /* Misc globals */
|
|
nmagic = 0; /* number of valid magic[]s */
|
|
|
|
struct magic *magic; /* array of magic entries */
|
|
|
|
char *magicfile; /* where magic be found */
|
|
|
|
char *progname; /* used throughout */
|
|
int lineno; /* line number in the magic file */
|
|
|
|
|
|
static void unwrap __P((char *fn));
|
|
#if 0
|
|
static int byteconv4 __P((int, int, int));
|
|
static short byteconv2 __P((int, int, int));
|
|
#endif
|
|
|
|
/*
|
|
* main - parse arguments and handle options
|
|
*/
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
int c;
|
|
int check = 0, didsomefiles = 0, errflg = 0, ret = 0, app = 0;
|
|
|
|
if ((progname = strrchr(argv[0], '/')) != NULL)
|
|
progname++;
|
|
else
|
|
progname = argv[0];
|
|
|
|
if (!(magicfile = getenv("MAGIC")))
|
|
magicfile = MAGIC;
|
|
|
|
while ((c = getopt(argc, argv, "vcdf:Lm:z")) != -1)
|
|
switch (c) {
|
|
case 'v':
|
|
(void) fprintf(stdout, "%s-%d.%d\n", progname,
|
|
FILE_VERSION_MAJOR, patchlevel);
|
|
return 1;
|
|
case 'c':
|
|
++check;
|
|
break;
|
|
case 'd':
|
|
++debug;
|
|
break;
|
|
case 'f':
|
|
if (!app) {
|
|
ret = apprentice(magicfile, check);
|
|
if (check)
|
|
exit(ret);
|
|
app = 1;
|
|
}
|
|
unwrap(optarg);
|
|
++didsomefiles;
|
|
break;
|
|
#ifdef S_IFLNK
|
|
case 'L':
|
|
++lflag;
|
|
break;
|
|
#endif
|
|
case 'm':
|
|
magicfile = optarg;
|
|
break;
|
|
case 'z':
|
|
zflag++;
|
|
break;
|
|
case '?':
|
|
default:
|
|
errflg++;
|
|
break;
|
|
}
|
|
|
|
if (errflg) {
|
|
(void) fprintf(stderr, USAGE, progname);
|
|
exit(2);
|
|
}
|
|
|
|
if (!app) {
|
|
ret = apprentice(magicfile, check);
|
|
if (check)
|
|
exit(ret);
|
|
app = 1;
|
|
}
|
|
|
|
if (optind == argc) {
|
|
if (!didsomefiles) {
|
|
(void)fprintf(stderr, USAGE, progname);
|
|
exit(2);
|
|
}
|
|
}
|
|
else {
|
|
int i, wid, nw;
|
|
for (wid = 0, i = optind; i < argc; i++) {
|
|
nw = strlen(argv[i]);
|
|
if (nw > wid)
|
|
wid = nw;
|
|
}
|
|
for (; optind < argc; optind++)
|
|
process(argv[optind], wid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* unwrap -- read a file of filenames, do each one.
|
|
*/
|
|
static void
|
|
unwrap(fn)
|
|
char *fn;
|
|
{
|
|
char buf[MAXPATHLEN];
|
|
FILE *f;
|
|
int wid = 0, cwid;
|
|
|
|
if (strcmp("-", fn) == 0) {
|
|
f = stdin;
|
|
wid = 1;
|
|
} else {
|
|
if ((f = fopen(fn, "r")) == NULL) {
|
|
error("Cannot open `%s' (%s).\n", fn, strerror(errno));
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
while (fgets(buf, MAXPATHLEN, f) != NULL) {
|
|
cwid = strlen(buf) - 1;
|
|
if (cwid > wid)
|
|
wid = cwid;
|
|
}
|
|
|
|
rewind(f);
|
|
}
|
|
|
|
while (fgets(buf, MAXPATHLEN, f) != NULL) {
|
|
buf[strlen(buf)-1] = '\0';
|
|
process(buf, wid);
|
|
}
|
|
|
|
(void) fclose(f);
|
|
}
|
|
|
|
|
|
#if 0
|
|
/*
|
|
* byteconv4
|
|
* Input:
|
|
* from 4 byte quantity to convert
|
|
* same whether to perform byte swapping
|
|
* big_endian whether we are a big endian host
|
|
*/
|
|
static int
|
|
byteconv4(from, same, big_endian)
|
|
int from;
|
|
int same;
|
|
int big_endian;
|
|
{
|
|
if (same)
|
|
return from;
|
|
else if (big_endian) /* lsb -> msb conversion on msb */
|
|
{
|
|
union {
|
|
int i;
|
|
char c[4];
|
|
} retval, tmpval;
|
|
|
|
tmpval.i = from;
|
|
retval.c[0] = tmpval.c[3];
|
|
retval.c[1] = tmpval.c[2];
|
|
retval.c[2] = tmpval.c[1];
|
|
retval.c[3] = tmpval.c[0];
|
|
|
|
return retval.i;
|
|
}
|
|
else
|
|
return ntohl(from); /* msb -> lsb conversion on lsb */
|
|
}
|
|
|
|
/*
|
|
* byteconv2
|
|
* Same as byteconv4, but for shorts
|
|
*/
|
|
static short
|
|
byteconv2(from, same, big_endian)
|
|
int from;
|
|
int same;
|
|
int big_endian;
|
|
{
|
|
if (same)
|
|
return from;
|
|
else if (big_endian) /* lsb -> msb conversion on msb */
|
|
{
|
|
union {
|
|
short s;
|
|
char c[2];
|
|
} retval, tmpval;
|
|
|
|
tmpval.s = (short) from;
|
|
retval.c[0] = tmpval.c[1];
|
|
retval.c[1] = tmpval.c[0];
|
|
|
|
return retval.s;
|
|
}
|
|
else
|
|
return ntohs(from); /* msb -> lsb conversion on lsb */
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* process - process input file
|
|
*/
|
|
void
|
|
process(inname, wid)
|
|
const char *inname;
|
|
int wid;
|
|
{
|
|
int fd = 0;
|
|
static const char stdname[] = "standard input";
|
|
unsigned char buf[HOWMANY+1]; /* one extra for terminating '\0' */
|
|
struct stat sb;
|
|
int nbytes = 0; /* number of bytes read from a datafile */
|
|
char match = '\0';
|
|
|
|
if (strcmp("-", inname) == 0) {
|
|
if (fstat(0, &sb)<0) {
|
|
error("cannot fstat `%s' (%s).\n", stdname,
|
|
strerror(errno));
|
|
/*NOTREACHED*/
|
|
}
|
|
inname = stdname;
|
|
}
|
|
|
|
if (wid > 0)
|
|
(void) printf("%s:%*s ", inname,
|
|
(int) (wid - strlen(inname)), "");
|
|
|
|
if (inname != stdname) {
|
|
/*
|
|
* first try judging the file based on its filesystem status
|
|
*/
|
|
if (fsmagic(inname, &sb) != 0) {
|
|
putchar('\n');
|
|
return;
|
|
}
|
|
|
|
if ((fd = open(inname, O_RDONLY)) < 0) {
|
|
/* We can't open it, but we were able to stat it. */
|
|
if (sb.st_mode & 0002) ckfputs("writeable, ", stdout);
|
|
if (sb.st_mode & 0111) ckfputs("executable, ", stdout);
|
|
ckfprintf(stdout, "can't read `%s' (%s).\n",
|
|
inname, strerror(errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* try looking at the first HOWMANY bytes
|
|
*/
|
|
if ((nbytes = read(fd, (char *)buf, HOWMANY)) == -1) {
|
|
error("read failed (%s).\n", strerror(errno));
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
if (nbytes == 0)
|
|
ckfputs("empty", stdout);
|
|
else {
|
|
buf[nbytes++] = '\0'; /* null-terminate it */
|
|
match = tryit(buf, nbytes, zflag);
|
|
}
|
|
|
|
#ifdef BUILTIN_ELF
|
|
if (match == 's' && nbytes > 5)
|
|
tryelf(fd, buf, nbytes);
|
|
#endif
|
|
|
|
if (inname != stdname) {
|
|
#ifdef RESTORE_TIME
|
|
/*
|
|
* Try to restore access, modification times if read it.
|
|
*/
|
|
# ifdef USE_UTIMES
|
|
struct timeval utsbuf[2];
|
|
utsbuf[0].tv_sec = sb.st_atime;
|
|
utsbuf[1].tv_sec = sb.st_mtime;
|
|
|
|
(void) utimes(inname, utsbuf); /* don't care if loses */
|
|
# else
|
|
struct utimbuf utbuf;
|
|
|
|
utbuf.actime = sb.st_atime;
|
|
utbuf.modtime = sb.st_mtime;
|
|
(void) utime(inname, &utbuf); /* don't care if loses */
|
|
# endif
|
|
#endif
|
|
(void) close(fd);
|
|
}
|
|
(void) putchar('\n');
|
|
}
|
|
|
|
|
|
int
|
|
tryit(buf, nb, zflag)
|
|
unsigned char *buf;
|
|
int nb, zflag;
|
|
{
|
|
/* try compression stuff */
|
|
if (zflag && zmagic(buf, nb))
|
|
return 'z';
|
|
|
|
/* try tests in /etc/magic (or surrogate magic file) */
|
|
if (softmagic(buf, nb))
|
|
return 's';
|
|
|
|
/* try known keywords, check whether it is ASCII */
|
|
if (ascmagic(buf, nb))
|
|
return 'a';
|
|
|
|
/* see if it's international language text */
|
|
if (internatmagic(buf, nb))
|
|
return 'i';
|
|
|
|
/* abandon hope, all ye who remain here */
|
|
ckfputs("data", stdout);
|
|
return '\0';
|
|
}
|