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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("@(#)$File: file.c,v 1.107 2007/01/25 21:05:46 christos Exp $")
- #endif /* lint */
- #ifdef S_IFLNK
- #define SYMLINKFLAG "Lh"
- #else
- #define SYMLINKFLAG ""
- #endif
- # define USAGE "Usage: %s [-bcik" SYMLINKFLAG "nNrsvz0] [-e test] [-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, i;
- 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'},
- {"exclude", 0, 0, 'e' },
- {"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
- static const struct {
- const char *name;
- int value;
- } nv[] = {
- { "apptype", MAGIC_NO_CHECK_APPTYPE },
- { "ascii", MAGIC_NO_CHECK_ASCII },
- { "compress", MAGIC_NO_CHECK_COMPRESS },
- { "elf", MAGIC_NO_CHECK_ELF },
- { "fortran", MAGIC_NO_CHECK_FORTRAN },
- { "soft", MAGIC_NO_CHECK_SOFT },
- { "tar", MAGIC_NO_CHECK_TAR },
- { "tokens", MAGIC_NO_CHECK_TOKENS },
- { "troff", MAGIC_NO_CHECK_TROFF },
- };
- #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 'e':
- for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++)
- if (strcmp(nv[i].name, optarg) == 0)
- break;
- if (i == sizeof(nv) / sizeof(nv[0]))
- errflg++;
- else
- flags |= nv[i].value;
- 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 __unused, 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)putc('\0', stdout);
- 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"
- " -e, --exclude exclude test from the list of test to be\n"
- " performed for file. Valid tests are:\n"
- " ascii, apptype, elf, compress, soft, tar\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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