ea8dc7e0f2
*- file is now broken into a library containing and processing the magic and a consumer binary.
529 lines
12 KiB
C
529 lines
12 KiB
C
/*
|
|
* Copyright (c) Ian F. Darwin 1986-1995.
|
|
* Software written by Ian F. Darwin and others;
|
|
* maintained 1995-present by Christos Zoulas and others.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice immediately at the beginning of the file, without modification,
|
|
* this list of conditions, and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Ian F. Darwin and others.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
/*
|
|
* file - find type of a file or files - main program.
|
|
*/
|
|
|
|
#include "file.h"
|
|
#include "magic.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <sys/param.h> /* for MAXPATHLEN */
|
|
#include <sys/stat.h>
|
|
#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_WCHAR_H
|
|
#include <wchar.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_GETOPT_H
|
|
#include <getopt.h> /* for long options (is this portable?)*/
|
|
#else
|
|
#undef HAVE_GETOPT_LONG
|
|
#endif
|
|
|
|
#include <netinet/in.h> /* for byte swapping */
|
|
|
|
#include "patchlevel.h"
|
|
|
|
#ifndef lint
|
|
FILE_RCSID("@(#)$Id: file.c,v 1.93 2004/04/07 14:23:55 christos Exp $")
|
|
#endif /* lint */
|
|
|
|
|
|
#ifdef S_IFLNK
|
|
#define SYMLINKFLAG "L"
|
|
#else
|
|
#define SYMLINKFLAG ""
|
|
#endif
|
|
|
|
# define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNsvz] [-f namefile] [-F separator] [-m magicfiles] file...\n %s -C -m magicfiles\n"
|
|
|
|
#ifndef MAXPATHLEN
|
|
#define MAXPATHLEN 512
|
|
#endif
|
|
|
|
private int /* Global command-line options */
|
|
bflag = 0, /* brief output format */
|
|
nopad = 0, /* Don't pad output */
|
|
nobuffer = 0; /* Do not buffer stdout */
|
|
|
|
private const char *magicfile = 0; /* where the magic is */
|
|
private const char *default_magicfile = MAGIC;
|
|
private char *separator = ":"; /* Default field separator */
|
|
|
|
private char *progname; /* used throughout */
|
|
|
|
private struct magic_set *magic;
|
|
|
|
private void unwrap(char *);
|
|
private void usage(void);
|
|
#ifdef HAVE_GETOPT_LONG
|
|
private void help(void);
|
|
#endif
|
|
#if 0
|
|
private int byteconv4(int, int, int);
|
|
private short byteconv2(int, int, int);
|
|
#endif
|
|
|
|
int main(int, char *[]);
|
|
private void process(const char *, int);
|
|
private void load(const char *, int);
|
|
|
|
|
|
/*
|
|
* main - parse arguments and handle options
|
|
*/
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int c;
|
|
int action = 0, didsomefiles = 0, errflg = 0;
|
|
int flags = 0;
|
|
char *home, *usermagic;
|
|
struct stat sb;
|
|
#define OPTSTRING "bcCdf:F:ikLm:nNprsvz"
|
|
#ifdef HAVE_GETOPT_LONG
|
|
int longindex;
|
|
private 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'},
|
|
{"separator", 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'},
|
|
#if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
|
|
{"preserve-date", 0, 0, 'p'},
|
|
#endif
|
|
{"uncompress", 0, 0, 'z'},
|
|
{"raw", 0, 0, 'r'},
|
|
{"no-buffer", 0, 0, 'n'},
|
|
{"no-pad", 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_LONG
|
|
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_LONG
|
|
case 0 :
|
|
if (longindex == 1)
|
|
help();
|
|
break;
|
|
#endif
|
|
case 'b':
|
|
++bflag;
|
|
break;
|
|
case 'c':
|
|
action = FILE_CHECK;
|
|
break;
|
|
case 'C':
|
|
action = FILE_COMPILE;
|
|
break;
|
|
case 'd':
|
|
flags |= MAGIC_DEBUG|MAGIC_CHECK;
|
|
break;
|
|
case 'f':
|
|
if(action)
|
|
usage();
|
|
load(magicfile, flags);
|
|
unwrap(optarg);
|
|
++didsomefiles;
|
|
break;
|
|
case 'F':
|
|
separator = optarg;
|
|
break;
|
|
case 'i':
|
|
flags |= MAGIC_MIME;
|
|
break;
|
|
case 'k':
|
|
flags |= MAGIC_CONTINUE;
|
|
break;
|
|
case 'm':
|
|
magicfile = optarg;
|
|
break;
|
|
case 'n':
|
|
++nobuffer;
|
|
break;
|
|
case 'N':
|
|
++nopad;
|
|
break;
|
|
#if defined(HAVE_UTIME) || defined(HAVE_UTIMES)
|
|
case 'p':
|
|
flags |= MAGIC_PRESERVE_ATIME;
|
|
break;
|
|
#endif
|
|
case 'r':
|
|
flags |= MAGIC_RAW;
|
|
break;
|
|
case 's':
|
|
flags |= MAGIC_DEVICES;
|
|
break;
|
|
case 'v':
|
|
(void) fprintf(stdout, "%s-%d.%.2d\n", progname,
|
|
FILE_VERSION_MAJOR, patchlevel);
|
|
(void) fprintf(stdout, "magic file from %s\n",
|
|
magicfile);
|
|
return 1;
|
|
case 'z':
|
|
flags |= MAGIC_COMPRESS;
|
|
break;
|
|
#ifdef S_IFLNK
|
|
case 'L':
|
|
flags |= MAGIC_SYMLINK;
|
|
break;
|
|
#endif
|
|
case '?':
|
|
default:
|
|
errflg++;
|
|
break;
|
|
}
|
|
|
|
if (errflg) {
|
|
usage();
|
|
}
|
|
|
|
switch(action) {
|
|
case FILE_CHECK:
|
|
case FILE_COMPILE:
|
|
magic = magic_open(flags|MAGIC_CHECK);
|
|
if (magic == NULL) {
|
|
(void)fprintf(stderr, "%s: %s\n", progname,
|
|
strerror(errno));
|
|
return 1;
|
|
}
|
|
c = action == FILE_CHECK ? magic_check(magic, magicfile) :
|
|
magic_compile(magic, magicfile);
|
|
if (c == -1) {
|
|
(void)fprintf(stderr, "%s: %s\n", progname,
|
|
magic_error(magic));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
default:
|
|
load(magicfile, flags);
|
|
break;
|
|
}
|
|
|
|
if (optind == argc) {
|
|
if (!didsomefiles) {
|
|
usage();
|
|
}
|
|
}
|
|
else {
|
|
int i, wid, nw;
|
|
for (wid = 0, i = optind; i < argc; i++) {
|
|
nw = file_mbswidth(argv[i]);
|
|
if (nw > wid)
|
|
wid = nw;
|
|
}
|
|
for (; optind < argc; optind++)
|
|
process(argv[optind], wid);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
private void
|
|
load(const char *m, int flags)
|
|
{
|
|
if (magic)
|
|
return;
|
|
magic = magic_open(flags);
|
|
if (magic == NULL) {
|
|
(void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (magic_load(magic, magicfile) == -1) {
|
|
(void)fprintf(stderr, "%s: %s\n",
|
|
progname, magic_error(magic));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* unwrap -- read a file of filenames, do each one.
|
|
*/
|
|
private 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) {
|
|
(void)fprintf(stderr, "%s: Cannot open `%s' (%s).\n",
|
|
progname, fn, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
while (fgets(buf, MAXPATHLEN, f) != NULL) {
|
|
cwid = file_mbswidth(buf) - 1;
|
|
if (cwid > wid)
|
|
wid = cwid;
|
|
}
|
|
|
|
rewind(f);
|
|
}
|
|
|
|
while (fgets(buf, MAXPATHLEN, f) != NULL) {
|
|
buf[file_mbswidth(buf)-1] = '\0';
|
|
process(buf, wid);
|
|
if(nobuffer)
|
|
(void) fflush(stdout);
|
|
}
|
|
|
|
(void) fclose(f);
|
|
}
|
|
|
|
private void
|
|
process(const char *inname, int wid)
|
|
{
|
|
const char *type;
|
|
int std_in = strcmp(inname, "-") == 0;
|
|
|
|
if (wid > 0 && !bflag)
|
|
(void) printf("%s%s%*s ", std_in ? "/dev/stdin" : inname,
|
|
separator, (int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
|
|
|
|
type = magic_file(magic, std_in ? NULL : inname);
|
|
if (type == NULL)
|
|
printf("ERROR: %s\n", magic_error(magic));
|
|
else
|
|
printf("%s\n", type);
|
|
}
|
|
|
|
|
|
#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
|
|
*/
|
|
private 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
|
|
*/
|
|
private 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
|
|
|
|
size_t
|
|
file_mbswidth(const char *s)
|
|
{
|
|
#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
|
|
size_t bytesconsumed, old_n, n, width = 0;
|
|
mbstate_t state;
|
|
wchar_t nextchar;
|
|
(void)memset(&state, 0, sizeof(mbstate_t));
|
|
old_n = n = strlen(s);
|
|
|
|
while (n > 0) {
|
|
bytesconsumed = mbrtowc(&nextchar, s, n, &state);
|
|
if (bytesconsumed == (size_t)(-1) ||
|
|
bytesconsumed == (size_t)(-2)) {
|
|
/* Something went wrong, return something reasonable */
|
|
return old_n;
|
|
}
|
|
if (s[0] == '\n') {
|
|
/*
|
|
* do what strlen() would do, so that caller
|
|
* is always right
|
|
*/
|
|
width++;
|
|
} else
|
|
width += wcwidth(nextchar);
|
|
|
|
s += bytesconsumed, n -= bytesconsumed;
|
|
}
|
|
return width;
|
|
#else
|
|
return strlen(s);
|
|
#endif
|
|
}
|
|
|
|
private void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, USAGE, progname, progname);
|
|
#ifdef HAVE_GETOPT_LONG
|
|
(void)fputs("Try `file --help' for more information.\n", stderr);
|
|
#endif
|
|
exit(1);
|
|
}
|
|
|
|
#ifdef HAVE_GETOPT_LONG
|
|
private 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"
|
|
" -F, --separator string use string as separator instead of `:'\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"
|
|
" -N, --no-pad do not pad output\n"
|
|
" -p, --preserve-date preserve access times on files\n"
|
|
" -r, --raw don't translate unprintable chars to \\ooo\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
|