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506 lines
11 KiB
C
506 lines
11 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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#ifndef lint
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FILE_RCSID("@(#)$File: magic.c,v 1.74 2011/05/26 01:27:59 christos Exp $")
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#endif /* lint */
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#include "magic.h"
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#include <stdlib.h>
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#ifdef PHP_WIN32
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#include "win32/unistd.h"
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#else
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#include <unistd.h>
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#endif
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#include <string.h>
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#ifdef PHP_WIN32
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# include "config.w32.h"
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#else
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# include "php_config.h"
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#endif
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#ifdef PHP_WIN32
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#include <shlwapi.h>
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#endif
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#include <limits.h> /* for PIPE_BUF */
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#if defined(HAVE_UTIMES)
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# include <sys/time.h>
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#elif defined(HAVE_UTIME)
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# if defined(HAVE_SYS_UTIME_H)
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# include <sys/utime.h>
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# elif defined(HAVE_UTIME_H)
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# include <utime.h>
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# endif
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for read() */
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#endif
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#ifndef PIPE_BUF
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/* Get the PIPE_BUF from pathconf */
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#ifdef _PC_PIPE_BUF
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#define PIPE_BUF pathconf(".", _PC_PIPE_BUF)
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#else
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#define PIPE_BUF 512
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#endif
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#endif
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#ifdef PHP_WIN32
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# undef S_IFLNK
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# undef S_IFIFO
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#endif
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private void free_mlist(struct mlist *);
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private void close_and_restore(const struct magic_set *, const char *, int,
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const struct stat *);
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private int unreadable_info(struct magic_set *, mode_t, const char *);
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private const char* get_default_magic(void);
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private const char *file_or_stream(struct magic_set *, const char *, php_stream *);
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#ifndef STDIN_FILENO
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#define STDIN_FILENO 0
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#endif
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/* XXX this functionality is excluded in php, enable it in apprentice.c:340 */
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#if 0
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private const char *
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get_default_magic(void)
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{
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static const char hmagic[] = "/.magic/magic.mgc";
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static char *default_magic;
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char *home, *hmagicpath;
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#ifndef PHP_WIN32
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struct stat st;
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if (default_magic) {
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free(default_magic);
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default_magic = NULL;
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}
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if ((home = getenv("HOME")) == NULL)
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return MAGIC;
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if (asprintf(&hmagicpath, "%s/.magic", home) < 0)
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return MAGIC;
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if (stat(hmagicpath, &st) == -1)
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goto out;
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if (S_ISDIR(st.st_mode)) {
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free(hmagicpath);
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if (asprintf(&hmagicpath, "%s/%s", home, hmagic) < 0)
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return MAGIC;
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if (access(hmagicpath, R_OK) == -1)
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goto out;
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}
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if (asprintf(&default_magic, "%s:%s", hmagicpath, MAGIC) < 0)
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goto out;
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free(hmagicpath);
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return default_magic;
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out:
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default_magic = NULL;
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free(hmagicpath);
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return MAGIC;
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#else
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char *hmagicp = hmagicpath;
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char *tmppath = NULL;
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LPTSTR dllpath;
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#define APPENDPATH() \
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do { \
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if (tmppath && access(tmppath, R_OK) != -1) { \
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if (hmagicpath == NULL) \
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hmagicpath = tmppath; \
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else { \
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if (asprintf(&hmagicp, "%s%c%s", hmagicpath, \
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PATHSEP, tmppath) >= 0) { \
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free(hmagicpath); \
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hmagicpath = hmagicp; \
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} \
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free(tmppath); \
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} \
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tmppath = NULL; \
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} \
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} while (/*CONSTCOND*/0)
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if (default_magic) {
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free(default_magic);
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default_magic = NULL;
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}
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/* First, try to get user-specific magic file */
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if ((home = getenv("LOCALAPPDATA")) == NULL) {
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if ((home = getenv("USERPROFILE")) != NULL)
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if (asprintf(&tmppath,
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"%s/Local Settings/Application Data%s", home,
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hmagic) < 0)
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tmppath = NULL;
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} else {
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if (asprintf(&tmppath, "%s%s", home, hmagic) < 0)
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tmppath = NULL;
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}
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APPENDPATH();
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/* Second, try to get a magic file from Common Files */
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if ((home = getenv("COMMONPROGRAMFILES")) != NULL) {
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if (asprintf(&tmppath, "%s%s", home, hmagic) >= 0)
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APPENDPATH();
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}
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/* Third, try to get magic file relative to dll location */
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dllpath = malloc(sizeof(*dllpath) * (MAX_PATH + 1));
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dllpath[MAX_PATH] = 0; /* just in case long path gets truncated and not null terminated */
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if (GetModuleFileNameA(NULL, dllpath, MAX_PATH)){
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PathRemoveFileSpecA(dllpath);
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if (strlen(dllpath) > 3 &&
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stricmp(&dllpath[strlen(dllpath) - 3], "bin") == 0) {
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if (asprintf(&tmppath,
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"%s/../share/misc/magic.mgc", dllpath) >= 0)
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APPENDPATH();
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} else {
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if (asprintf(&tmppath,
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"%s/share/misc/magic.mgc", dllpath) >= 0)
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APPENDPATH();
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else if (asprintf(&tmppath,
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"%s/magic.mgc", dllpath) >= 0)
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APPENDPATH();
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}
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}
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/* Don't put MAGIC constant - it likely points to a file within MSys
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tree */
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default_magic = hmagicpath;
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return default_magic;
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#endif
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}
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public const char *
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magic_getpath(const char *magicfile, int action)
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{
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if (magicfile != NULL)
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return magicfile;
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magicfile = getenv("MAGIC");
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if (magicfile != NULL)
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return magicfile;
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return action == FILE_LOAD ? get_default_magic() : MAGIC;
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}
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#endif
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public struct magic_set *
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magic_open(int flags)
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{
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struct magic_set *ms;
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ms = ecalloc((size_t)1, sizeof(struct magic_set));
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if (magic_setflags(ms, flags) == -1) {
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errno = EINVAL;
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goto free;
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}
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ms->o.buf = ms->o.pbuf = NULL;
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ms->c.li = emalloc((ms->c.len = 10) * sizeof(*ms->c.li));
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ms->event_flags = 0;
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ms->error = -1;
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ms->mlist = NULL;
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ms->file = "unknown";
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ms->line = 0;
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return ms;
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free:
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efree(ms);
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return NULL;
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}
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private void
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free_mlist(struct mlist *mlist)
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{
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struct mlist *ml;
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if (mlist == NULL)
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return;
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for (ml = mlist->next; ml != mlist;) {
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struct mlist *next = ml->next;
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struct magic *mg = ml->magic;
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file_delmagic(mg, ml->mapped, ml->nmagic);
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efree(ml);
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ml = next;
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}
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efree(ml);
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}
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private int
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unreadable_info(struct magic_set *ms, mode_t md, const char *file)
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{
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/* We cannot open it, but we were able to stat it. */
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if (access(file, W_OK) == 0)
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if (file_printf(ms, "writable, ") == -1)
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return -1;
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if (access(file, X_OK) == 0)
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if (file_printf(ms, "executable, ") == -1)
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return -1;
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if (S_ISREG(md))
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if (file_printf(ms, "regular file, ") == -1)
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return -1;
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if (file_printf(ms, "no read permission") == -1)
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return -1;
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return 0;
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}
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public void
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magic_close(struct magic_set *ms)
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{
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if (ms->mlist) {
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free_mlist(ms->mlist);
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}
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if (ms->o.pbuf) {
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efree(ms->o.pbuf);
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}
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if (ms->o.buf) {
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efree(ms->o.buf);
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}
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if (ms->c.li) {
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efree(ms->c.li);
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}
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efree(ms);
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}
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/*
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* load a magic file
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*/
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public int
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magic_load(struct magic_set *ms, const char *magicfile)
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{
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struct mlist *ml = file_apprentice(ms, magicfile, FILE_LOAD);
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if (ml) {
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free_mlist(ms->mlist);
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ms->mlist = ml;
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return 0;
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}
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return -1;
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}
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public int
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magic_compile(struct magic_set *ms, const char *magicfile)
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{
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struct mlist *ml = file_apprentice(ms, magicfile, FILE_COMPILE);
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free_mlist(ml);
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return ml ? 0 : -1;
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}
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public int
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magic_list(struct magic_set *ms, const char *magicfile)
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{
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struct mlist *ml = file_apprentice(ms, magicfile, FILE_LIST);
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free_mlist(ml);
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return ml ? 0 : -1;
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}
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private void
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close_and_restore(const struct magic_set *ms, const char *name, int fd,
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const struct stat *sb)
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{
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if ((ms->flags & MAGIC_PRESERVE_ATIME) != 0) {
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/*
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* Try to restore access, modification times if read it.
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* This is really *bad* because it will modify the status
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* time of the file... And of course this will affect
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* backup programs
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*/
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#ifdef HAVE_UTIMES
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struct timeval utsbuf[2];
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(void)memset(utsbuf, 0, sizeof(utsbuf));
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utsbuf[0].tv_sec = sb->st_atime;
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utsbuf[1].tv_sec = sb->st_mtime;
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(void) utimes(name, utsbuf); /* don't care if loses */
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#elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H)
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struct utimbuf utbuf;
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(void)memset(&utbuf, 0, sizeof(utbuf));
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utbuf.actime = sb->st_atime;
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utbuf.modtime = sb->st_mtime;
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(void) utime(name, &utbuf); /* don't care if loses */
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#endif
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}
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}
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/*
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* find type of descriptor
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*/
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public const char *
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magic_descriptor(struct magic_set *ms, int fd)
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{
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return file_or_stream(ms, NULL, NULL);
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}
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/*
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* find type of named file
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*/
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public const char *
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magic_file(struct magic_set *ms, const char *inname)
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{
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return file_or_stream(ms, inname, NULL);
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}
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public const char *
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magic_stream(struct magic_set *ms, php_stream *stream)
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{
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return file_or_stream(ms, NULL, stream);
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}
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private const char *
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file_or_stream(struct magic_set *ms, const char *inname, php_stream *stream)
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{
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int rv = -1;
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unsigned char *buf;
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struct stat sb;
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ssize_t nbytes = 0; /* number of bytes read from a datafile */
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int no_in_stream = 0;
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TSRMLS_FETCH();
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if (!inname && !stream) {
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return NULL;
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}
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/*
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* one extra for terminating '\0', and
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* some overlapping space for matches near EOF
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*/
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#define SLOP (1 + sizeof(union VALUETYPE))
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buf = emalloc(HOWMANY + SLOP);
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if (file_reset(ms) == -1)
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goto done;
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switch (file_fsmagic(ms, inname, &sb, stream)) {
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case -1: /* error */
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goto done;
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case 0: /* nothing found */
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break;
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default: /* matched it and printed type */
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rv = 0;
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goto done;
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}
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errno = 0;
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if (!stream && inname) {
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no_in_stream = 1;
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#if PHP_API_VERSION < 20100412
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stream = php_stream_open_wrapper((char *)inname, "rb", REPORT_ERRORS|ENFORCE_SAFE_MODE, NULL);
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#else
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stream = php_stream_open_wrapper((char *)inname, "rb", REPORT_ERRORS, NULL);
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#endif
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}
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if (!stream) {
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if (unreadable_info(ms, sb.st_mode, inname) == -1)
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goto done;
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rv = 0;
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goto done;
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}
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#ifdef O_NONBLOCK
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/* we should be already be in non blocking mode for network socket */
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#endif
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/*
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* try looking at the first HOWMANY bytes
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*/
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if ((nbytes = php_stream_read(stream, (char *)buf, HOWMANY)) < 0) {
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file_error(ms, errno, "cannot read `%s'", inname);
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goto done;
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}
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(void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
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if (file_buffer(ms, stream, inname, buf, (size_t)nbytes) == -1)
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goto done;
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rv = 0;
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done:
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efree(buf);
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if (no_in_stream && stream) {
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php_stream_close(stream);
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}
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close_and_restore(ms, inname, 0, &sb);
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return rv == 0 ? file_getbuffer(ms) : NULL;
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}
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public const char *
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magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
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{
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if (file_reset(ms) == -1)
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return NULL;
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/*
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* The main work is done here!
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* We have the file name and/or the data buffer to be identified.
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*/
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if (file_buffer(ms, NULL, NULL, buf, nb) == -1) {
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return NULL;
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}
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return file_getbuffer(ms);
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}
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public const char *
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magic_error(struct magic_set *ms)
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{
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return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL;
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}
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public int
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magic_errno(struct magic_set *ms)
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{
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return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0;
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}
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public int
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magic_setflags(struct magic_set *ms, int flags)
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{
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#if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
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if (flags & MAGIC_PRESERVE_ATIME)
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return -1;
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#endif
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ms->flags = flags;
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return 0;
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}
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