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HardenedBSD/contrib/file/file.c
David E. O'Brien d1d50c78ab Virgin import of Christos Zoulas's FILE 4.19.
2007-05-24 16:12:23 +00:00

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/*
* 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.
*
* 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>
#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 1.104 2006/11/25 17:28:54 christos Exp $")
#endif /* lint */
#ifdef S_IFLNK
#define SYMLINKFLAG "Lh"
#else
#define SYMLINKFLAG ""
#endif
# define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNrsvz0] [-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 */
nulsep = 0; /* Append '\0' to the separator */
private const char *magicfile = 0; /* where the magic is */
private const char *default_magicfile = MAGIC;
private const 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;
static const char hmagic[] = "/.magic";
#define OPTSTRING "bcCdf:F:hikLm:nNprsvz0"
#ifdef HAVE_GETOPT_LONG
int longindex;
static const 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'},
{"no-dereference", 0, 0, 'h'},
#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'},
{"print0", 0, 0, '0'},
{0, 0, 0, 0},
};
#endif
#ifdef LC_CTYPE
/* makes islower etc work for other langs */
(void)setlocale(LC_CTYPE, "");
#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)
+ sizeof(hmagic))) != NULL) {
(void)strcpy(usermagic, home);
(void)strcat(usermagic, hmagic);
if (stat(usermagic, &sb)<0)
free(usermagic);
else
magicfile = usermagic;
}
}
#ifdef S_IFLNK
flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0;
#endif
#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 '0':
nulsep = 1;
break;
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;
case 'h':
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);
}
magic_close(magic);
return 0;
}
private void
/*ARGSUSED*/
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;
size_t len;
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) {
len = strlen(buf);
if (len > 0 && buf[len - 1] == '\n')
buf[len - 1] = '\0';
cwid = file_mbswidth(buf);
if (cwid > wid)
wid = cwid;
}
rewind(f);
}
while (fgets(buf, MAXPATHLEN, f) != NULL) {
len = strlen(buf);
if (len > 0 && buf[len - 1] == '\n')
buf[len - 1] = '\0';
process(buf, wid);
if(nobuffer)
(void)fflush(stdout);
}
(void)fclose(f);
}
/*
* Called for each input file on the command line (or in a list of files)
*/
private void
process(const char *inname, int wid)
{
const char *type;
int std_in = strcmp(inname, "-") == 0;
if (wid > 0 && !bflag) {
(void)printf("%s", std_in ? "/dev/stdin" : inname);
if (nulsep)
(void)puts('\0');
else
(void)printf("%s", separator);
(void)printf("%*s ",
(int) (nopad ? 0 : (wid - file_mbswidth(inname))), "");
}
type = magic_file(magic, std_in ? NULL : inname);
if (type == NULL)
(void)printf("ERROR: %s\n", magic_error(magic));
else
(void)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)
{
(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
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