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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"
- #ifndef lint
- FILE_RCSID("@(#)$File: file.c,v 1.172 2016/10/24 15:21:07 christos Exp $")
- #endif /* lint */
- #include "magic.h"
- #include <stdlib.h>
- #include <unistd.h>
- #include <string.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_WCHAR_H
- #include <wchar.h>
- #endif
- #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION)
- #include <getopt.h>
- #ifndef HAVE_GETOPT_LONG
- int getopt_long(int argc, char * const *argv, const char *optstring, const struct option *longopts, int *longindex);
- #endif
- #else
- #include "mygetopt.h"
- #endif
- #ifdef S_IFLNK
- #define FILE_FLAGS "-bcEhikLlNnprsvzZ0"
- #else
- #define FILE_FLAGS "-bcEiklNnprsvzZ0"
- #endif
- # define USAGE \
- "Usage: %s [" FILE_FLAGS \
- "] [--apple] [--extension] [--mime-encoding] [--mime-type]\n" \
- " [-e testname] [-F separator] [-f namefile] [-m magicfiles] " \
- "file ...\n" \
- " %s -C [-m magicfiles]\n" \
- " %s [--help]\n"
- 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 *separator = ":"; /* Default field separator */
- private const struct option long_options[] = {
- #define OPT_HELP 1
- #define OPT_APPLE 2
- #define OPT_EXTENSIONS 3
- #define OPT_MIME_TYPE 4
- #define OPT_MIME_ENCODING 5
- #define OPT(shortname, longname, opt, def, doc) \
- {longname, opt, NULL, shortname},
- #define OPT_LONGONLY(longname, opt, def, doc, id) \
- {longname, opt, NULL, id},
- #include "file_opts.h"
- #undef OPT
- #undef OPT_LONGONLY
- {0, 0, NULL, 0}
- };
- #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsvzZ0"
- private const struct {
- const char *name;
- int value;
- } nv[] = {
- { "apptype", MAGIC_NO_CHECK_APPTYPE },
- { "ascii", MAGIC_NO_CHECK_ASCII },
- { "cdf", MAGIC_NO_CHECK_CDF },
- { "compress", MAGIC_NO_CHECK_COMPRESS },
- { "elf", MAGIC_NO_CHECK_ELF },
- { "encoding", MAGIC_NO_CHECK_ENCODING },
- { "soft", MAGIC_NO_CHECK_SOFT },
- { "tar", MAGIC_NO_CHECK_TAR },
- { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */
- { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */
- };
- private struct {
- const char *name;
- int tag;
- size_t value;
- } pm[] = {
- { "indir", MAGIC_PARAM_INDIR_MAX, 0 },
- { "name", MAGIC_PARAM_NAME_MAX, 0 },
- { "elf_phnum", MAGIC_PARAM_ELF_PHNUM_MAX, 0 },
- { "elf_shnum", MAGIC_PARAM_ELF_SHNUM_MAX, 0 },
- { "elf_notes", MAGIC_PARAM_ELF_NOTES_MAX, 0 },
- { "regex", MAGIC_PARAM_REGEX_MAX, 0 },
- { "bytes", MAGIC_PARAM_BYTES_MAX, 0 },
- };
- private char *progname; /* used throughout */
- private int posixly;
- #ifdef __dead
- __dead
- #endif
- private void usage(void);
- private void docprint(const char *, int);
- #ifdef __dead
- __dead
- #endif
- private void help(void);
- private int unwrap(struct magic_set *, const char *);
- private int process(struct magic_set *ms, const char *, int);
- private struct magic_set *load(const char *, int);
- private void setparam(const char *);
- private void applyparam(magic_t);
- /*
- * main - parse arguments and handle options
- */
- int
- main(int argc, char *argv[])
- {
- int c;
- size_t i;
- int action = 0, didsomefiles = 0, errflg = 0;
- int flags = 0, e = 0;
- struct magic_set *magic = NULL;
- int longindex;
- const char *magicfile = NULL; /* where the magic is */
- /* makes islower etc work for other langs */
- #ifdef HAVE_SETLOCALE
- (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];
- #ifdef S_IFLNK
- posixly = getenv("POSIXLY_CORRECT") != NULL;
- flags |= posixly ? MAGIC_SYMLINK : 0;
- #endif
- while ((c = getopt_long(argc, argv, OPTSTRING, long_options,
- &longindex)) != -1)
- switch (c) {
- case OPT_HELP:
- help();
- break;
- case OPT_APPLE:
- flags |= MAGIC_APPLE;
- break;
- case OPT_EXTENSIONS:
- flags |= MAGIC_EXTENSION;
- break;
- case OPT_MIME_TYPE:
- flags |= MAGIC_MIME_TYPE;
- break;
- case OPT_MIME_ENCODING:
- flags |= MAGIC_MIME_ENCODING;
- break;
- case '0':
- nulsep++;
- 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':
- flags |= MAGIC_ERROR;
- 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();
- if (magic == NULL)
- if ((magic = load(magicfile, flags)) == NULL)
- return 1;
- applyparam(magic);
- e |= unwrap(magic, optarg);
- ++didsomefiles;
- break;
- case 'F':
- separator = optarg;
- break;
- case 'i':
- flags |= MAGIC_MIME;
- break;
- case 'k':
- flags |= MAGIC_CONTINUE;
- break;
- case 'l':
- action = FILE_LIST;
- 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 'P':
- setparam(optarg);
- break;
- case 'r':
- flags |= MAGIC_RAW;
- break;
- case 's':
- flags |= MAGIC_DEVICES;
- break;
- case 'v':
- if (magicfile == NULL)
- magicfile = magic_getpath(magicfile, action);
- (void)fprintf(stdout, "%s-%s\n", progname, VERSION);
- (void)fprintf(stdout, "magic file from %s\n",
- magicfile);
- return 0;
- case 'z':
- flags |= MAGIC_COMPRESS;
- break;
- case 'Z':
- flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP;
- break;
- #ifdef S_IFLNK
- case 'L':
- flags |= MAGIC_SYMLINK;
- break;
- case 'h':
- flags &= ~MAGIC_SYMLINK;
- break;
- #endif
- case '?':
- default:
- errflg++;
- break;
- }
- if (errflg) {
- usage();
- }
- if (e)
- return e;
- if (MAGIC_VERSION != magic_version())
- (void)fprintf(stderr, "%s: compiled magic version [%d] "
- "does not match with shared library magic version [%d]\n",
- progname, MAGIC_VERSION, magic_version());
- switch(action) {
- case FILE_CHECK:
- case FILE_COMPILE:
- case FILE_LIST:
- /*
- * Don't try to check/compile ~/.magic unless we explicitly
- * ask for it.
- */
- magic = magic_open(flags|MAGIC_CHECK);
- if (magic == NULL) {
- (void)fprintf(stderr, "%s: %s\n", progname,
- strerror(errno));
- return 1;
- }
- switch(action) {
- case FILE_CHECK:
- c = magic_check(magic, magicfile);
- break;
- case FILE_COMPILE:
- c = magic_compile(magic, magicfile);
- break;
- case FILE_LIST:
- c = magic_list(magic, magicfile);
- break;
- default:
- abort();
- }
- if (c == -1) {
- (void)fprintf(stderr, "%s: %s\n", progname,
- magic_error(magic));
- e = 1;
- goto out;
- }
- goto out;
- default:
- if (magic == NULL)
- if ((magic = load(magicfile, flags)) == NULL)
- return 1;
- applyparam(magic);
- }
- if (optind == argc) {
- if (!didsomefiles)
- usage();
- }
- else {
- size_t j, wid, nw;
- for (wid = 0, j = (size_t)optind; j < (size_t)argc; j++) {
- nw = file_mbswidth(argv[j]);
- if (nw > wid)
- wid = nw;
- }
- /*
- * If bflag is only set twice, set it depending on
- * number of files [this is undocumented, and subject to change]
- */
- if (bflag == 2) {
- bflag = optind >= argc - 1;
- }
- for (; optind < argc; optind++)
- e |= process(magic, argv[optind], wid);
- }
- out:
- if (magic)
- magic_close(magic);
- return e;
- }
- private void
- applyparam(magic_t magic)
- {
- size_t i;
- for (i = 0; i < __arraycount(pm); i++) {
- if (pm[i].value == 0)
- continue;
- if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1) {
- (void)fprintf(stderr, "%s: Can't set %s %s\n", progname,
- pm[i].name, strerror(errno));
- exit(1);
- }
- }
- }
- private void
- setparam(const char *p)
- {
- size_t i;
- char *s;
- if ((s = strchr(p, '=')) == NULL)
- goto badparm;
- for (i = 0; i < __arraycount(pm); i++) {
- if (strncmp(p, pm[i].name, s - p) != 0)
- continue;
- pm[i].value = atoi(s + 1);
- return;
- }
- badparm:
- (void)fprintf(stderr, "%s: Unknown param %s\n", progname, p);
- exit(1);
- }
- private struct magic_set *
- /*ARGSUSED*/
- load(const char *magicfile, int flags)
- {
- struct magic_set *magic = magic_open(flags);
- const char *e;
- if (magic == NULL) {
- (void)fprintf(stderr, "%s: %s\n", progname, strerror(errno));
- return NULL;
- }
- if (magic_load(magic, magicfile) == -1) {
- (void)fprintf(stderr, "%s: %s\n",
- progname, magic_error(magic));
- magic_close(magic);
- return NULL;
- }
- if ((e = magic_error(magic)) != NULL)
- (void)fprintf(stderr, "%s: Warning: %s\n", progname, e);
- return magic;
- }
- /*
- * unwrap -- read a file of filenames, do each one.
- */
- private int
- unwrap(struct magic_set *ms, const char *fn)
- {
- FILE *f;
- ssize_t len;
- char *line = NULL;
- size_t llen = 0;
- int wid = 0, cwid;
- int e = 0;
- 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));
- return 1;
- }
- while ((len = getline(&line, &llen, f)) > 0) {
- if (line[len - 1] == '\n')
- line[len - 1] = '\0';
- cwid = file_mbswidth(line);
- if (cwid > wid)
- wid = cwid;
- }
- rewind(f);
- }
- while ((len = getline(&line, &llen, f)) > 0) {
- if (line[len - 1] == '\n')
- line[len - 1] = '\0';
- e |= process(ms, line, wid);
- if(nobuffer)
- (void)fflush(stdout);
- }
- free(line);
- (void)fclose(f);
- return e;
- }
- /*
- * Called for each input file on the command line (or in a list of files)
- */
- private int
- process(struct magic_set *ms, const char *inname, int wid)
- {
- const char *type, c = nulsep > 1 ? '\0' : '\n';
- int std_in = strcmp(inname, "-") == 0;
- if (wid > 0 && !bflag) {
- (void)printf("%s", std_in ? "/dev/stdin" : inname);
- if (nulsep)
- (void)putc('\0', stdout);
- if (nulsep < 2) {
- (void)printf("%s", separator);
- (void)printf("%*s ",
- (int) (nopad ? 0 : (wid - file_mbswidth(inname))),
- "");
- }
- }
- type = magic_file(ms, std_in ? NULL : inname);
- if (type == NULL) {
- (void)printf("ERROR: %s%c", magic_error(ms), c);
- return 1;
- } else {
- (void)printf("%s%c", type, c);
- return 0;
- }
- }
- protected 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 {
- int w = wcwidth(nextchar);
- if (w > 0)
- width += w;
- }
- s += bytesconsumed, n -= bytesconsumed;
- }
- return width;
- #else
- return strlen(s);
- #endif
- }
- private void
- usage(void)
- {
- (void)fprintf(stderr, USAGE, progname, progname, progname);
- exit(1);
- }
- private void
- defprint(int def)
- {
- if (!def)
- return;
- if (((def & 1) && posixly) || ((def & 2) && !posixly))
- fprintf(stdout, " (default)");
- fputc('\n', stdout);
- }
- private void
- docprint(const char *opts, int def)
- {
- size_t i;
- int comma;
- char *sp, *p;
- p = strstr(opts, "%o");
- if (p == NULL) {
- fprintf(stdout, "%s", opts);
- defprint(def);
- return;
- }
- for (sp = p - 1; sp > opts && *sp == ' '; sp--)
- continue;
- fprintf(stdout, "%.*s", (int)(p - opts), opts);
- comma = 0;
- for (i = 0; i < __arraycount(nv); i++) {
- fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name);
- if (i && i % 5 == 0) {
- fprintf(stdout, ",\n%*s", (int)(p - sp - 1), "");
- comma = 0;
- }
- }
- fprintf(stdout, "%s", opts + (p - opts) + 2);
- }
- private void
- help(void)
- {
- (void)fputs(
- "Usage: file [OPTION...] [FILE...]\n"
- "Determine type of FILEs.\n"
- "\n", stdout);
- #define OPT(shortname, longname, opt, def, doc) \
- fprintf(stdout, " -%c, --" longname, shortname), \
- docprint(doc, def);
- #define OPT_LONGONLY(longname, opt, def, doc, id) \
- fprintf(stdout, " --" longname), \
- docprint(doc, def);
- #include "file_opts.h"
- #undef OPT
- #undef OPT_LONGONLY
- fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n");
- exit(0);
- }
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