560 lines
12 KiB
C
560 lines
12 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.
|
|
*/
|
|
|
|
#include "file.h"
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/param.h> /* for MAXPATHLEN */
|
|
#include <fcntl.h> /* for open() */
|
|
#ifdef RESTORE_TIME
|
|
# if (__COHERENT__ >= 0x420)
|
|
# include <sys/utime.h>
|
|
# else
|
|
# ifdef USE_UTIMES
|
|
# include <sys/time.h>
|
|
# else
|
|
# include <utime.h>
|
|
# endif
|
|
# endif
|
|
#endif
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h> /* for read() */
|
|
#endif
|
|
#ifdef HAVE_LOCALE_H
|
|
#include <locale.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_GETOPT_H
|
|
#include <getopt.h> /* for long options (is this portable?)*/
|
|
#endif
|
|
|
|
#include <netinet/in.h> /* for byte swapping */
|
|
|
|
#include "patchlevel.h"
|
|
|
|
#ifndef lint
|
|
FILE_RCSID("@(#)$Id: file.c,v 1.66 2002/07/03 19:00:41 christos Exp $")
|
|
#endif /* lint */
|
|
|
|
|
|
#ifdef S_IFLNK
|
|
# define USAGE "Usage: %s [-bciknsvzL] [-f namefile] [-m magicfiles] file...\n"
|
|
#else
|
|
# define USAGE "Usage: %s [-bciknsvz] [-f namefile] [-m magicfiles] file...\n"
|
|
#endif
|
|
|
|
#ifdef __EMX__
|
|
static char *apptypeName = NULL;
|
|
int os2_apptype (const char *fn, char *buf, int nb);
|
|
#endif /* __EMX__ */
|
|
|
|
#ifndef MAGIC
|
|
# define MAGIC "/etc/magic"
|
|
#endif
|
|
|
|
#ifndef MAXPATHLEN
|
|
#define MAXPATHLEN 512
|
|
#endif
|
|
|
|
int /* Global command-line options */
|
|
debug = 0, /* debugging */
|
|
lflag = 0, /* follow Symlinks (BSD only) */
|
|
bflag = 0, /* brief output format */
|
|
zflag = 0, /* follow (uncompress) compressed files */
|
|
sflag = 0, /* read block special files */
|
|
iflag = 0,
|
|
nobuffer = 0, /* Do not buffer stdout */
|
|
kflag = 0; /* Keep going after the first match */
|
|
|
|
int /* Misc globals */
|
|
nmagic = 0; /* number of valid magic[]s */
|
|
|
|
struct magic *magic; /* array of magic entries */
|
|
|
|
const char *magicfile = 0; /* where the magic is */
|
|
const char *default_magicfile = MAGIC;
|
|
|
|
char *progname; /* used throughout */
|
|
int lineno; /* line number in the magic file */
|
|
|
|
|
|
static void unwrap(char *fn);
|
|
static void usage(void);
|
|
#ifdef HAVE_GETOPT_H
|
|
static void help(void);
|
|
#endif
|
|
#if 0
|
|
static int byteconv4(int, int, int);
|
|
static short byteconv2(int, int, int);
|
|
#endif
|
|
|
|
int main(int, char *[]);
|
|
|
|
/*
|
|
* main - parse arguments and handle options
|
|
*/
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int c;
|
|
int action = 0, didsomefiles = 0, errflg = 0, ret = 0, app = 0;
|
|
char *mime, *home, *usermagic;
|
|
struct stat sb;
|
|
#define OPTSTRING "bcdf:ikm:nsvzCL"
|
|
#ifdef HAVE_GETOPT_H
|
|
int longindex;
|
|
static struct option long_options[] =
|
|
{
|
|
{"version", 0, 0, 'v'},
|
|
{"help", 0, 0, 0},
|
|
{"brief", 0, 0, 'b'},
|
|
{"checking-printout", 0, 0, 'c'},
|
|
{"debug", 0, 0, 'd'},
|
|
{"files-from", 1, 0, 'f'},
|
|
{"mime", 0, 0, 'i'},
|
|
{"keep-going", 0, 0, 'k'},
|
|
#ifdef S_IFLNK
|
|
{"dereference", 0, 0, 'L'},
|
|
#endif
|
|
{"magic-file", 1, 0, 'm'},
|
|
{"uncompress", 0, 0, 'z'},
|
|
{"no-buffer", 0, 0, 'n'},
|
|
{"special-files", 0, 0, 's'},
|
|
{"compile", 0, 0, 'C'},
|
|
{0, 0, 0, 0},
|
|
};
|
|
#endif
|
|
|
|
#ifdef LC_CTYPE
|
|
setlocale(LC_CTYPE, ""); /* makes islower etc work for other langs */
|
|
#endif
|
|
|
|
#ifdef __EMX__
|
|
/* sh-like wildcard expansion! Shouldn't hurt at least ... */
|
|
_wildcard(&argc, &argv);
|
|
#endif
|
|
|
|
if ((progname = strrchr(argv[0], '/')) != NULL)
|
|
progname++;
|
|
else
|
|
progname = argv[0];
|
|
|
|
magicfile = default_magicfile;
|
|
if ((usermagic = getenv("MAGIC")) != NULL)
|
|
magicfile = usermagic;
|
|
else
|
|
if ((home = getenv("HOME")) != NULL) {
|
|
if ((usermagic = malloc(strlen(home) + 8)) != NULL) {
|
|
(void)strcpy(usermagic, home);
|
|
(void)strcat(usermagic, "/.magic");
|
|
if (stat(usermagic, &sb)<0)
|
|
free(usermagic);
|
|
else
|
|
magicfile = usermagic;
|
|
}
|
|
}
|
|
|
|
#ifndef HAVE_GETOPT_H
|
|
while ((c = getopt(argc, argv, OPTSTRING)) != -1)
|
|
#else
|
|
while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
|
|
&longindex)) != -1)
|
|
#endif
|
|
switch (c) {
|
|
#ifdef HAVE_GETOPT_H
|
|
case 0 :
|
|
if (longindex == 1)
|
|
help();
|
|
break;
|
|
#endif
|
|
case 'b':
|
|
++bflag;
|
|
break;
|
|
case 'c':
|
|
action = CHECK;
|
|
break;
|
|
case 'C':
|
|
action = COMPILE;
|
|
break;
|
|
case 'd':
|
|
++debug;
|
|
break;
|
|
case 'f':
|
|
if (!app) {
|
|
ret = apprentice(magicfile, action);
|
|
if (action)
|
|
exit(ret);
|
|
app = 1;
|
|
}
|
|
unwrap(optarg);
|
|
++didsomefiles;
|
|
break;
|
|
case 'i':
|
|
iflag++;
|
|
if ((mime = malloc(strlen(magicfile) + 6)) != NULL) {
|
|
(void)strcpy(mime, magicfile);
|
|
(void)strcat(mime, ".mime");
|
|
magicfile = mime;
|
|
}
|
|
break;
|
|
case 'k':
|
|
kflag = 1;
|
|
break;
|
|
case 'm':
|
|
magicfile = optarg;
|
|
break;
|
|
case 'n':
|
|
++nobuffer;
|
|
break;
|
|
case 's':
|
|
sflag++;
|
|
break;
|
|
case 'v':
|
|
(void) fprintf(stdout, "%s-%d.%d\n", progname,
|
|
FILE_VERSION_MAJOR, patchlevel);
|
|
(void) fprintf(stdout, "magic file from %s\n",
|
|
magicfile);
|
|
return 1;
|
|
case 'z':
|
|
zflag++;
|
|
break;
|
|
#ifdef S_IFLNK
|
|
case 'L':
|
|
++lflag;
|
|
break;
|
|
#endif
|
|
case '?':
|
|
default:
|
|
errflg++;
|
|
break;
|
|
}
|
|
|
|
if (errflg) {
|
|
usage();
|
|
}
|
|
|
|
if (!app) {
|
|
ret = apprentice(magicfile, action);
|
|
if (action)
|
|
exit(ret);
|
|
app = 1;
|
|
}
|
|
|
|
if (optind == argc) {
|
|
if (!didsomefiles) {
|
|
usage();
|
|
}
|
|
}
|
|
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(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);
|
|
if(nobuffer)
|
|
(void) fflush(stdout);
|
|
}
|
|
|
|
(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(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(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(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 && !bflag)
|
|
(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(iflag ? "application/x-empty" : "empty", stdout);
|
|
else {
|
|
buf[nbytes++] = '\0'; /* null-terminate it */
|
|
match = tryit(inname, buf, nbytes, zflag);
|
|
}
|
|
|
|
#ifdef BUILTIN_ELF
|
|
if (match == 's' && nbytes > 5) {
|
|
/*
|
|
* We matched something in the file, so this *might*
|
|
* be an ELF file, and the file is at least 5 bytes long,
|
|
* so if it's an ELF file it has at least one byte
|
|
* past the ELF magic number - try extracting information
|
|
* from the ELF headers that can't easily be extracted
|
|
* with rules in the magic file.
|
|
*/
|
|
tryelf(fd, buf, nbytes);
|
|
}
|
|
#endif
|
|
|
|
if (inname != stdname) {
|
|
#ifdef RESTORE_TIME
|
|
/*
|
|
* Try to restore access, modification times if read it.
|
|
* This is really *bad* because it will modify the status
|
|
* time of the file... And of course this will affect
|
|
* backup programs
|
|
*/
|
|
# 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(const char *fn, unsigned char *buf, int nb, int zfl)
|
|
{
|
|
|
|
/*
|
|
* The main work is done here!
|
|
* We have the file name and/or the data buffer to be identified.
|
|
*/
|
|
|
|
#ifdef __EMX__
|
|
/*
|
|
* Ok, here's the right place to add a call to some os-specific
|
|
* routine, e.g.
|
|
*/
|
|
if (os2_apptype(fn, buf, nb) == 1)
|
|
return 'o';
|
|
#endif
|
|
/* try compression stuff */
|
|
if (zfl && zmagic(fn, 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';
|
|
|
|
/* abandon hope, all ye who remain here */
|
|
ckfputs(iflag ? "application/octet-stream" : "data", stdout);
|
|
return '\0';
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, USAGE, progname);
|
|
(void)fprintf(stderr, "Usage: %s -C [-m magic]\n", progname);
|
|
#ifdef HAVE_GETOPT_H
|
|
(void)fputs("Try `file --help' for more information.\n", stderr);
|
|
#endif
|
|
exit(1);
|
|
}
|
|
|
|
#ifdef HAVE_GETOPT_H
|
|
static void
|
|
help(void)
|
|
{
|
|
puts(
|
|
"Usage: file [OPTION]... [FILE]...\n"
|
|
"Determine file type of FILEs.\n"
|
|
"\n"
|
|
" -m, --magic-file LIST use LIST as a colon-separated list of magic\n"
|
|
" number files\n"
|
|
" -z, --uncompress try to look inside compressed files\n"
|
|
" -b, --brief do not prepend filenames to output lines\n"
|
|
" -c, --checking-printout print the parsed form of the magic file, use in\n"
|
|
" conjunction with -m to debug a new magic file\n"
|
|
" before installing it\n"
|
|
" -f, --files-from FILE read the filenames to be examined from FILE\n"
|
|
" -i, --mime output mime type strings\n"
|
|
" -k, --keep-going don't stop at the first match\n"
|
|
" -L, --dereference causes symlinks to be followed\n"
|
|
" -n, --no-buffer do not buffer output\n"
|
|
" -s, --special-files treat special (block/char devices) files as\n"
|
|
" ordinary ones\n"
|
|
" --help display this help and exit\n"
|
|
" --version output version information and exit\n"
|
|
);
|
|
exit(0);
|
|
}
|
|
#endif
|