349 lines
8.0 KiB
C
349 lines
8.0 KiB
C
/*
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* Copyright (c) Christos Zoulas 2003.
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* All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice immediately at the beginning of the file, without modification,
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* this list of conditions, and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "file.h"
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#include "magic.h"
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#if defined(HAVE_WCHAR_H)
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#include <wchar.h>
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#endif
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#if defined(HAVE_WCTYPE_H)
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#include <wctype.h>
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#endif
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#if defined(HAVE_LIMITS_H)
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#include <limits.h>
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#endif
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#ifndef lint
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FILE_RCSID("@(#)$File: funcs.c,v 1.44 2008/07/16 18:00:57 christos Exp $")
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#endif /* lint */
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#ifndef SIZE_MAX
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#define SIZE_MAX ((size_t)~0)
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#endif
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/*
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* Like printf, only we append to a buffer.
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*/
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protected int
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file_vprintf(struct magic_set *ms, const char *fmt, va_list ap)
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{
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int len;
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char *buf, *newstr;
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len = vasprintf(&buf, fmt, ap);
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if (len < 0)
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goto out;
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if (ms->o.buf != NULL) {
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len = asprintf(&newstr, "%s%s", ms->o.buf, buf);
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free(buf);
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if (len < 0)
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goto out;
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free(ms->o.buf);
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buf = newstr;
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}
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ms->o.buf = buf;
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return 0;
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out:
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file_error(ms, errno, "vasprintf failed");
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return -1;
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}
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protected int
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file_printf(struct magic_set *ms, const char *fmt, ...)
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{
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int rv;
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va_list ap;
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va_start(ap, fmt);
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rv = file_vprintf(ms, fmt, ap);
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va_end(ap);
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return rv;
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}
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/*
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* error - print best error message possible
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*/
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/*VARARGS*/
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private void
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file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
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uint32_t lineno)
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{
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/* Only the first error is ok */
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if (ms->haderr)
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return;
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if (lineno != 0) {
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free(ms->o.buf);
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ms->o.buf = NULL;
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file_printf(ms, "line %u: ", lineno);
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}
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file_vprintf(ms, f, va);
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if (error > 0)
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file_printf(ms, " (%s)", strerror(error));
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ms->haderr++;
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ms->error = error;
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}
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/*VARARGS*/
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protected void
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file_error(struct magic_set *ms, int error, const char *f, ...)
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{
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va_list va;
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va_start(va, f);
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file_error_core(ms, error, f, va, 0);
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va_end(va);
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}
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/*
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* Print an error with magic line number.
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*/
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/*VARARGS*/
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protected void
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file_magerror(struct magic_set *ms, const char *f, ...)
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{
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va_list va;
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va_start(va, f);
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file_error_core(ms, 0, f, va, ms->line);
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va_end(va);
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}
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protected void
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file_oomem(struct magic_set *ms, size_t len)
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{
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file_error(ms, errno, "cannot allocate %zu bytes", len);
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}
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protected void
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file_badseek(struct magic_set *ms)
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{
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file_error(ms, errno, "error seeking");
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}
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protected void
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file_badread(struct magic_set *ms)
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{
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file_error(ms, errno, "error reading");
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}
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#ifndef COMPILE_ONLY
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protected int
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file_buffer(struct magic_set *ms, int fd, const char *inname, const void *buf,
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size_t nb)
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{
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int m;
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int mime = ms->flags & MAGIC_MIME;
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const unsigned char *ubuf = CAST(const unsigned char *, buf);
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if (nb == 0) {
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if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
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file_printf(ms, mime ? "application/x-empty" :
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"empty") == -1)
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return -1;
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return 1;
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} else if (nb == 1) {
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if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
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file_printf(ms, mime ? "application/octet-stream" :
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"very short file (no magic)") == -1)
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return -1;
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return 1;
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}
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#ifdef __EMX__
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if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
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switch (file_os2_apptype(ms, inname, buf, nb)) {
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case -1:
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return -1;
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case 0:
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break;
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default:
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return 1;
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}
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}
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#endif
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/* try compression stuff */
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if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) != 0 ||
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(m = file_zmagic(ms, fd, inname, ubuf, nb)) == 0) {
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/* Check if we have a tar file */
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if ((ms->flags & MAGIC_NO_CHECK_TAR) != 0 ||
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(m = file_is_tar(ms, ubuf, nb)) == 0) {
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/* try tests in /etc/magic (or surrogate magic file) */
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if ((ms->flags & MAGIC_NO_CHECK_SOFT) != 0 ||
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(m = file_softmagic(ms, ubuf, nb, BINTEST)) == 0) {
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/* try known keywords, check whether it is ASCII */
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if ((ms->flags & MAGIC_NO_CHECK_ASCII) != 0 ||
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(m = file_ascmagic(ms, ubuf, nb)) == 0) {
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/* abandon hope, all ye who remain here */
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if ((!mime || (mime & MAGIC_MIME_TYPE)) &&
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file_printf(ms, mime ? "application/octet-stream" :
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"data") == -1)
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return -1;
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m = 1;
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}
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}
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}
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}
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#ifdef BUILTIN_ELF
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if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 &&
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nb > 5 && fd != -1) {
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/*
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* We matched something in the file, so this *might*
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* be an ELF file, and the file is at least 5 bytes
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* long, so if it's an ELF file it has at least one
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* byte past the ELF magic number - try extracting
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* information from the ELF headers that cannot easily
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* be extracted with rules in the magic file.
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*/
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(void)file_tryelf(ms, fd, ubuf, nb);
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}
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#endif
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return m;
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}
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#endif
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protected int
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file_reset(struct magic_set *ms)
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{
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if (ms->mlist == NULL) {
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file_error(ms, 0, "no magic files loaded");
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return -1;
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}
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ms->o.buf = NULL;
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ms->haderr = 0;
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ms->error = -1;
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return 0;
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}
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#define OCTALIFY(n, o) \
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/*LINTED*/ \
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(void)(*(n)++ = '\\', \
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*(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
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*(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
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*(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
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(o)++)
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protected const char *
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file_getbuffer(struct magic_set *ms)
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{
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char *pbuf, *op, *np;
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size_t psize, len;
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if (ms->haderr)
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return NULL;
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if (ms->flags & MAGIC_RAW)
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return ms->o.buf;
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/* * 4 is for octal representation, + 1 is for NUL */
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len = strlen(ms->o.buf);
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if (len > (SIZE_MAX - 1) / 4) {
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file_oomem(ms, len);
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return NULL;
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}
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psize = len * 4 + 1;
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if ((pbuf = CAST(char *, realloc(ms->o.pbuf, psize))) == NULL) {
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file_oomem(ms, psize);
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return NULL;
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}
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ms->o.pbuf = pbuf;
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#if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
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{
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mbstate_t state;
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wchar_t nextchar;
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int mb_conv = 1;
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size_t bytesconsumed;
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char *eop;
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(void)memset(&state, 0, sizeof(mbstate_t));
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np = ms->o.pbuf;
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op = ms->o.buf;
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eop = op + len;
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while (op < eop) {
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bytesconsumed = mbrtowc(&nextchar, op,
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(size_t)(eop - op), &state);
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if (bytesconsumed == (size_t)(-1) ||
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bytesconsumed == (size_t)(-2)) {
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mb_conv = 0;
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break;
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}
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if (iswprint(nextchar)) {
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(void)memcpy(np, op, bytesconsumed);
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op += bytesconsumed;
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np += bytesconsumed;
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} else {
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while (bytesconsumed-- > 0)
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OCTALIFY(np, op);
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}
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}
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*np = '\0';
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/* Parsing succeeded as a multi-byte sequence */
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if (mb_conv != 0)
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return ms->o.pbuf;
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}
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#endif
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for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
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if (isprint((unsigned char)*op)) {
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*np++ = *op;
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} else {
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OCTALIFY(np, op);
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}
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}
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*np = '\0';
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return ms->o.pbuf;
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}
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protected int
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file_check_mem(struct magic_set *ms, unsigned int level)
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{
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size_t len;
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if (level >= ms->c.len) {
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len = (ms->c.len += 20) * sizeof(*ms->c.li);
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ms->c.li = CAST(struct level_info *, (ms->c.li == NULL) ?
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malloc(len) :
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realloc(ms->c.li, len));
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if (ms->c.li == NULL) {
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file_oomem(ms, len);
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return -1;
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}
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}
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ms->c.li[level].got_match = 0;
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#ifdef ENABLE_CONDITIONALS
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ms->c.li[level].last_match = 0;
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ms->c.li[level].last_cond = COND_NONE;
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#endif /* ENABLE_CONDITIONALS */
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return 0;
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}
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