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dis-bench / src /php /php-src /ext /fileinfo /libmagic /magic.c
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/*
* Copyright (c) Christos Zoulas 2003.
* All Rights Reserved.
*
* 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.
*/
#include "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: magic.c,v 1.123 2023/12/29 18:04:48 christos Exp $")
#endif /* lint */
#include "magic.h"
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#ifdef QUICK
#include <sys/mman.h>
#endif
#include <limits.h> /* for PIPE_BUF */
#if defined(HAVE_UTIMES)
# include <sys/time.h>
#elif defined(HAVE_UTIME)
# if defined(HAVE_SYS_UTIME_H)
# include <sys/utime.h>
# elif defined(HAVE_UTIME_H)
# include <utime.h>
# endif
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for read() */
#endif
#ifndef PIPE_BUF
/* Get the PIPE_BUF from pathconf */
#ifdef _PC_PIPE_BUF
#define PIPE_BUF pathconf(".", _PC_PIPE_BUF)
#else
#define PIPE_BUF 512
#endif
#endif
#ifdef PHP_WIN32
# undef S_IFLNK
# undef S_IFIFO
#endif
file_private int unreadable_info(struct magic_set *, mode_t, const char *);
file_private const char *file_or_stream(struct magic_set *, const char *, php_stream *);
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
file_public struct magic_set *
magic_open(int flags)
{
return file_ms_alloc(flags);
}
file_private int
unreadable_info(struct magic_set *ms, mode_t md, const char *file)
{
if (file) {
/* We cannot open it, but we were able to stat it. */
if (access(file, W_OK) == 0)
if (file_printf(ms, "writable, ") == -1)
return -1;
#ifndef WIN32
if (access(file, X_OK) == 0)
if (file_printf(ms, "executable, ") == -1)
return -1;
#else
/* X_OK doesn't work well on MS-Windows */
{
const char *p = strrchr(file, '.');
if (p && (stricmp(p, ".exe")
|| stricmp(p, ".dll")
|| stricmp(p, ".bat")
|| stricmp(p, ".cmd")))
if (file_printf(ms, "writable, ") == -1)
return -1;
}
#endif
}
if (S_ISREG(md))
if (file_printf(ms, "regular file, ") == -1)
return -1;
if (file_printf(ms, "no read permission") == -1)
return -1;
return 0;
}
file_public void
magic_close(struct magic_set *ms)
{
if (ms == NULL)
return;
file_ms_free(ms);
}
/*
* load a magic file
*/
file_public int
magic_load(struct magic_set *ms, const char *magicfile)
{
if (ms == NULL)
return -1;
return file_apprentice(ms, magicfile, FILE_LOAD);
}
file_public int
magic_compile(struct magic_set *ms, const char *magicfile)
{
if (ms == NULL)
return -1;
return file_apprentice(ms, magicfile, FILE_COMPILE);
}
file_public int
magic_check(struct magic_set *ms, const char *magicfile)
{
if (ms == NULL)
return -1;
return file_apprentice(ms, magicfile, FILE_CHECK);
}
file_public int
magic_list(struct magic_set *ms, const char *magicfile)
{
if (ms == NULL)
return -1;
return file_apprentice(ms, magicfile, FILE_LIST);
}
#ifndef COMPILE_ONLY
/*
* find type of descriptor
*/
file_public const char *
magic_descriptor(struct magic_set *ms, int fd)
{
if (ms == NULL)
return NULL;
return file_or_stream(ms, NULL, NULL);
}
/*
* find type of named file
*/
file_public const char *
magic_file(struct magic_set *ms, const char *inname)
{
if (ms == NULL)
return NULL;
return file_or_stream(ms, inname, NULL);
}
file_public const char *
magic_stream(struct magic_set *ms, php_stream *stream)
{
if (ms == NULL)
return NULL;
return file_or_stream(ms, NULL, stream);
}
file_private const char *
file_or_stream(struct magic_set *ms, const char *inname, php_stream *stream)
{
int rv = -1;
unsigned char *buf;
zend_stat_t sb = {0};
ssize_t nbytes = 0; /* number of bytes read from a datafile */
int no_in_stream = 0;
if (file_reset(ms, 1) == -1)
goto out;
/*
* one extra for terminating '\0', and
* some overlapping space for matches near EOF
*/
#define SLOP (1 + sizeof(union VALUETYPE))
if ((buf = CAST(unsigned char *, emalloc(ms->bytes_max + SLOP))) == NULL)
return NULL;
switch (file_fsmagic(ms, inname, &sb)) {
case -1: /* error */
goto done;
case 0: /* nothing found */
break;
default: /* matched it and printed type */
rv = 0;
goto done;
}
errno = 0;
if (inname && !stream) {
no_in_stream = 1;
stream = php_stream_open_wrapper((char *)inname, "rb", REPORT_ERRORS, NULL);
if (!stream) {
if (unreadable_info(ms, sb.st_mode, inname) == -1)
goto done;
rv = -1;
goto done;
}
}
php_stream_statbuf ssb;
if (php_stream_stat(stream, &ssb) < 0) {
if (ms->flags & MAGIC_ERROR) {
file_error(ms, errno, "cannot stat `%s'", inname);
rv = -1;
goto done;
}
}
memcpy(&sb, &ssb.sb, sizeof(zend_stat_t));
/*
* try looking at the first ms->bytes_max bytes
*/
if ((nbytes = php_stream_read(stream, (char *)buf, ms->bytes_max - nbytes)) < 0) {
file_error(ms, errno, "cannot read `%s'", inname);
goto done;
}
(void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
if (file_buffer(ms, stream, &sb, inname, buf, CAST(size_t, nbytes)) == -1)
goto done;
rv = 0;
done:
efree(buf);
if (no_in_stream && stream) {
php_stream_close(stream);
}
out:
return rv == 0 ? file_getbuffer(ms) : NULL;
}
file_public const char *
magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
{
if (ms == NULL)
return NULL;
if (file_reset(ms, 1) == -1)
return NULL;
/*
* The main work is done here!
* We have the file name and/or the data buffer to be identified.
*/
if (file_buffer(ms, NULL, NULL, NULL, buf, nb) == -1) {
return NULL;
}
return file_getbuffer(ms);
}
#endif
file_public const char *
magic_error(struct magic_set *ms)
{
if (ms == NULL)
return "Magic database is not open";
return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL;
}
file_public int
magic_errno(struct magic_set *ms)
{
if (ms == NULL)
return EINVAL;
return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0;
}
file_public int
magic_getflags(struct magic_set *ms)
{
if (ms == NULL)
return -1;
return ms->flags;
}
file_public int
magic_setflags(struct magic_set *ms, int flags)
{
if (ms == NULL)
return -1;
#if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
if (flags & MAGIC_PRESERVE_ATIME)
return -1;
#endif
ms->flags = flags;
return 0;
}
file_public int
magic_version(void)
{
return MAGIC_VERSION;
}
file_public int
magic_setparam(struct magic_set *ms, int param, const void *val)
{
if (ms == NULL)
return -1;
const size_t v = *CAST(const size_t *, val);
switch (param) {
case MAGIC_PARAM_INDIR_MAX:
ms->indir_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_NAME_MAX:
ms->name_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_ELF_PHNUM_MAX:
ms->elf_phnum_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_ELF_SHNUM_MAX:
ms->elf_shnum_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_ELF_SHSIZE_MAX:
ms->elf_shsize_max = v;
return 0;
case MAGIC_PARAM_ELF_NOTES_MAX:
ms->elf_notes_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_REGEX_MAX:
ms->regex_max = CAST(uint16_t, v);
return 0;
case MAGIC_PARAM_BYTES_MAX:
ms->bytes_max = v;
return 0;
case MAGIC_PARAM_ENCODING_MAX:
ms->encoding_max = v;
return 0;
case MAGIC_PARAM_MAGWARN_MAX:
ms->magwarn_max = v;
return 0;
default:
errno = EINVAL;
return -1;
}
}
file_public int
magic_getparam(struct magic_set *ms, int param, void *val)
{
if (ms == NULL)
return -1;
switch (param) {
case MAGIC_PARAM_INDIR_MAX:
*CAST(size_t *, val) = ms->indir_max;
return 0;
case MAGIC_PARAM_NAME_MAX:
*CAST(size_t *, val) = ms->name_max;
return 0;
case MAGIC_PARAM_ELF_PHNUM_MAX:
*CAST(size_t *, val) = ms->elf_phnum_max;
return 0;
case MAGIC_PARAM_ELF_SHNUM_MAX:
*CAST(size_t *, val) = ms->elf_shnum_max;
return 0;
case MAGIC_PARAM_ELF_SHSIZE_MAX:
*CAST(size_t *, val) = ms->elf_shsize_max;
return 0;
case MAGIC_PARAM_ELF_NOTES_MAX:
*CAST(size_t *, val) = ms->elf_notes_max;
return 0;
case MAGIC_PARAM_REGEX_MAX:
*CAST(size_t *, val) = ms->regex_max;
return 0;
case MAGIC_PARAM_BYTES_MAX:
*CAST(size_t *, val) = ms->bytes_max;
return 0;
case MAGIC_PARAM_ENCODING_MAX:
*CAST(size_t *, val) = ms->encoding_max;
return 0;
case MAGIC_PARAM_MAGWARN_MAX:
*CAST(size_t *, val) = ms->magwarn_max;
return 0;
default:
errno = EINVAL;
return -1;
}
}