SSL mod_mime_magic.c Sprache: C

/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*
* mod_mime_magic: MIME type lookup via file magic numbers
* Copyright (c) 1996-1997 Cisco Systems, Inc.
*
* This software was submitted by Cisco Systems to the Apache Software Foundation in July
* 1997. Future revisions and derivatives of this source code must
* acknowledge Cisco Systems as the original contributor of this module.
* All other licensing and usage conditions are those of the Apache Software Foundation.
*
* Some of this code is derived from the free version of the file command
* originally posted to comp.sources.unix. Copyright info for that program
* is included below as required.
* ---------------------------------------------------------------------------
* - Copyright (c) Ian F. Darwin, 1987. Written by Ian F. Darwin.
*
* This software is not subject to any license of the American Telephone and
* Telegraph Company or of the Regents of the University of California.
*
* Permission is granted to anyone to use this software for any purpose on any
* computer system, and to alter it and redistribute it freely, subject to
* the following restrictions:
*
* 1. The author is not responsible for the consequences of use of this
* software, no matter how awful, even if they arise from flaws in it.
*
* 2. The origin of this software must not be misrepresented, either by
* explicit claim or by omission. Since few users ever read sources, credits
* must appear in the documentation.
*
* 3. Altered versions must be plainly marked as such, and must not be
* misrepresented as being the original software. Since few users ever read
* sources, credits must appear in the documentation.
*
* 4. This notice may not be removed or altered.
* -------------------------------------------------------------------------
*
* For compliance with Mr Darwin's terms: this has been very significantly
* modified from the free "file" command.
* - all-in-one file for compilation convenience when moving from one
* version of Apache to the next.
* - Memory allocation is done through the Apache API's apr_pool_t structure.
* - All functions have had necessary Apache API request or server
* structures passed to them where necessary to call other Apache API
* routines. (i.e. usually for logging, files, or memory allocation in
* itself or a called function.)
* - struct magic has been converted from an array to a single-ended linked
* list because it only grows one record at a time, it's only accessed
* sequentially, and the Apache API has no equivalent of realloc().
* - Functions have been changed to get their parameters from the server
* configuration instead of globals. (It should be reentrant now but has
* not been tested in a threaded environment.)
* - Places where it used to print results to stdout now saves them in a
* list where they're used to set the MIME type in the Apache request
* record.
* - Command-line flags have been removed since they will never be used here.
*
* Ian Kluft <ikluft@cisco.com>
* Engineering Information Framework
* Central Engineering
* Cisco Systems, Inc.
* San Jose, CA, USA
*
* Initial installation July/August 1996
* Misc bug fixes May 1997
* Submission to Apache Software Foundation July 1997
*
*/

#include "apr.h"
#include "apr_strings.h"
#include "apr_lib.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"

#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
#include "util_script.h"

/* ### this isn't set by configure? does anybody set this? */
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif

/*
* data structures and related constants
*/

#define MODNAME "mod_mime_magic"
#define MIME_MAGIC_DEBUG 0

#define MIME_BINARY_UNKNOWN "application/octet-stream"
#define MIME_TEXT_UNKNOWN "text/plain"

#define MAXMIMESTRING 256

/* HOWMANY must be at least 4096 to make gzip -dcq work */
#define HOWMANY 4096
/* SMALL_HOWMANY limits how much work we do to figure out text files */
#define SMALL_HOWMANY 1024
#define MAXDESC 50 /* max leng of text description */
#define MAXstring 64 /* max leng of "string" types */

struct magic {
 struct magic *next; /* link to next entry */
 int lineno; /* line number from magic file */

 short flag;
#define INDIR 1 /* if '>(...)' appears, */
#define UNSIGNED 2 /* comparison is unsigned */
 short cont_level; /* level of ">" */
 struct {
 char type; /* byte short long */
 long offset; /* offset from indirection */
 } in;
 long offset; /* offset to magic number */
 unsigned char reln; /* relation (0=eq, '>'=gt, etc) */
 char type; /* int, short, long or string. */
 char vallen; /* length of string value, if any */
#define BYTE 1
#define SHORT 2
#define LONG 4
#define STRING 5
#define DATE 6
#define BESHORT 7
#define BELONG 8
#define BEDATE 9
#define LESHORT 10
#define LELONG 11
#define LEDATE 12
 union VALUETYPE {
 unsigned char b;
 unsigned short h;
 unsigned long l;
 char s[MAXstring];
 unsigned char hs[2]; /* 2 bytes of a fixed-endian "short" */
 unsigned char hl[4]; /* 2 bytes of a fixed-endian "long" */
 } value; /* either number or string */
 unsigned long mask; /* mask before comparison with value */
 char nospflag; /* suppress space character */

 /* NOTE: this string is suspected of overrunning - find it! */
 char desc[MAXDESC]; /* description */
};

/*
* data structures for tar file recognition
* --------------------------------------------------------------------------
* Header file for public domain tar (tape archive) program.
*
* @(#)tar.h 1.20 86/10/29 Public Domain. Created 25 August 1985 by John
* Gilmore, ihnp4!hoptoad!gnu.
*
* Header block on tape.
*
* I'm going to use traditional DP naming conventions here. A "block" is a big
* chunk of stuff that we do I/O on. A "record" is a piece of info that we
* care about. Typically many "record"s fit into a "block".
*/
#define RECORDSIZE 512
#define NAMSIZ 100
#define TUNMLEN 32
#define TGNMLEN 32

union record {
 char charptr[RECORDSIZE];
 struct header {
 char name[NAMSIZ];
 char mode[8];
 char uid[8];
 char gid[8];
 char size[12];
 char mtime[12];
 char chksum[8];
 char linkflag;
 char linkname[NAMSIZ];
 char magic[8];
 char uname[TUNMLEN];
 char gname[TGNMLEN];
 char devmajor[8];
 char devminor[8];
 } header;
};

/* The magic field is filled with this if uname and gname are valid. */
#define TMAGIC "ustar " /* 7 chars and a null */

/*
* file-function prototypes
*/
static int ascmagic(request_rec *, unsigned char *, apr_size_t);
static int is_tar(unsigned char *, apr_size_t);
static int softmagic(request_rec *, unsigned char *, apr_size_t);
static int tryit(request_rec *, unsigned char *, apr_size_t, int);
static int zmagic(request_rec *, unsigned char *, apr_size_t);

static int getvalue(server_rec *, struct magic *, char **);
static int hextoint(int);
static char *getstr(server_rec *, char *, char *, int, int *);
static int parse(server_rec *, apr_pool_t *p, char *, int);

static int match(request_rec *, unsigned char *, apr_size_t);
static int mget(request_rec *, union VALUETYPE *, unsigned char *,
 struct magic *, apr_size_t);
static int mcheck(request_rec *, union VALUETYPE *, struct magic *);
static void mprint(request_rec *, union VALUETYPE *, struct magic *);

static int uncompress(request_rec *, int,
 unsigned char **, apr_size_t);
static long from_oct(int, char *);
static int fsmagic(request_rec *r, const char *fn);

/*
* includes for ASCII substring recognition formerly "names.h" in file
* command
*
* Original notes: names and types used by ascmagic in file(1). These tokens are
* here because they can appear anywhere in the first HOWMANY bytes, while
* tokens in /etc/magic must appear at fixed offsets into the file. Don't
* make HOWMANY too high unless you have a very fast CPU.
*/

/* these types are used to index the apr_table_t 'types': keep em in sync! */
/* HTML inserted in first because this is a web server module now */
#define L_HTML 0 /* HTML */
#define L_C 1 /* first and foremost on UNIX */
#define L_FORT 2 /* the oldest one */
#define L_MAKE 3 /* Makefiles */
#define L_PLI 4 /* PL/1 */
#define L_MACH 5 /* some kinda assembler */
#define L_ENG 6 /* English */
#define L_PAS 7 /* Pascal */
#define L_MAIL 8 /* Electronic mail */
#define L_NEWS 9 /* Usenet Netnews */

static const char *const types[] =
{
 "text/html", /* HTML */
 "text/plain", /* "c program text", */
 "text/plain", /* "fortran program text", */
 "text/plain", /* "make commands text", */
 "text/plain", /* "pl/1 program text", */
 "text/plain", /* "assembler program text", */
 "text/plain", /* "English text", */
 "text/plain", /* "pascal program text", */
 "message/rfc822", /* "mail text", */
 "message/news", /* "news text", */
 "application/binary", /* "can't happen error on names.h/types", */
 0
};

static const struct names {
 const char *name;
 short type;
} names[] = {

 /* These must be sorted by eye for optimal hit rate */
 /* Add to this list only after substantial meditation */
 {
 "", L_HTML
 },
 {
 "", L_HTML
 },
 {
 "", L_HTML
 },
 {
 "", L_HTML
 },
 {
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