/* * 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 1.149 2013/01/07 18:20:19 christos Exp $") #endif /* lint */ #include "magic.h" #include #include #include #ifdef RESTORE_TIME # if (__COHERENT__ >= 0x420) # include # else # ifdef USE_UTIMES # include # else # include # endif # endif #endif #ifdef HAVE_UNISTD_H #include /* for read() */ #endif #ifdef HAVE_LOCALE_H #include #endif #ifdef HAVE_WCHAR_H #include #endif #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION) #include #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 "-bchikLlNnprsvz0" #else #define FILE_FLAGS "-bciklNnprsvz0" #endif # define USAGE \ "Usage: %s [" FILE_FLAGS \ "] [--apple] [--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(shortname, longname, opt, doc) \ {longname, opt, NULL, shortname}, #define OPT_LONGONLY(longname, opt, doc) \ {longname, opt, NULL, 0}, #include "file_opts.h" #undef OPT #undef OPT_LONGONLY {0, 0, NULL, 0} }; #define OPTSTRING "bcCde:f:F:hiklLm:nNprsvz0" 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 char *progname; /* used throughout */ private void usage(void); private void docprint(const char *); 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); /* * 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 */ (void)setlocale(LC_CTYPE, ""); #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 flags |= getenv("POSIXLY_CORRECT") ? MAGIC_SYMLINK : 0; #endif while ((c = getopt_long(argc, argv, OPTSTRING, long_options, &longindex)) != -1) switch (c) { case 0 : switch (longindex) { case 0: help(); break; case 10: flags |= MAGIC_APPLE; break; case 11: flags |= MAGIC_MIME_TYPE; break; case 12: flags |= MAGIC_MIME_ENCODING; break; } break; 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(); if (magic == NULL) if ((magic = load(magicfile, flags)) == NULL) return 1; 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 '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; #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)); return 1; } return 0; default: if (magic == NULL) if ((magic = load(magicfile, flags)) == NULL) return 1; break; } 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); } if (magic) magic_close(magic); return e; } private struct magic_set * /*ARGSUSED*/ load(const char *magicfile, int flags) { struct magic_set *magic = magic_open(flags); 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; } 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; int std_in = strcmp(inname, "-") == 0; if (wid > 0 && !bflag) { (void)printf("%s", std_in ? "/dev/stdin" : inname); if (nulsep) (void)putc('\0', stdout); (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\n", magic_error(ms)); return 1; } else { (void)printf("%s\n", type); 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 width += wcwidth(nextchar); 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 docprint(const char *opts) { size_t i; int comma; char *sp, *p; p = strstr(opts, "%o"); if (p == NULL) { fprintf(stdout, "%s", opts); 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, doc) \ fprintf(stdout, " -%c, --" longname, shortname), \ docprint(doc); #define OPT_LONGONLY(longname, opt, doc) \ fprintf(stdout, " --" longname), \ docprint(doc); #include "file_opts.h" #undef OPT #undef OPT_LONGONLY fprintf(stdout, "\nReport bugs to http://bugs.gw.com/\n"); exit(0); }