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/* ====================================================================
* Copyright (c) 1995-1997 The Apache Group. 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, 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.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED 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 APACHE GROUP OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/
/*
* 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 Group 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 Group.
*
* 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 pool 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 Group July 1997
*
*/
#include <sys/wait.h>
#include <sys/stat.h>
#include <time.h>
#include <utime.h>
#include <stdarg.h>
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_log.h"
#include "http_protocol.h"
/*
* data structures and related constants
*/
#define MODNAME "mod_mime_magic"
#define MIME_MAGIC_DEBUG 0
#ifndef MAGIC
#define MAGIC "conf/magic"
#endif
#define MIME_BINARY_UNKNOWN "application/octet-stream"
#define MIME_TEXT_UNKNOWN "text/plain"
#define MAXMIMESTRING 256
#define HOWMANY 1024 /* big enough to recognize most WWW files */
#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; /* supress 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 apprentice(server_rec *, pool *);
static int ascmagic(request_rec *, unsigned char *, int);
static int is_tar(unsigned char *, int);
static void magic_process(request_rec *);
static int softmagic(request_rec *, unsigned char *, int);
static void tryit(request_rec *, unsigned char *, int);
static int zmagic(request_rec *, unsigned char *, int);
static unsigned long signextend(server_rec *, struct magic *, unsigned long);
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 *, pool * p, char *, int);
static int match(request_rec *, unsigned char *, int);
static int
mget(request_rec *, union VALUETYPE *, unsigned char *,
struct magic *, int);
static int mcheck(request_rec *, union VALUETYPE *, struct magic *);
static void mprint(request_rec *, union VALUETYPE *, struct magic *);
static int mconvert(request_rec *, union VALUETYPE *, struct magic *);
static int
uncompress(request_rec *, int, const unsigned char *,
unsigned char **, int);
static long from_oct(int, char *);
static int fsmagic(request_rec * r, const char *fn, struct stat * sb);
/*
* 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 table '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 char *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 struct names {
char *name;
short type;
} names[] = {
/* These must be sorted by eye for optimal hit rate */
/* Add to this list only after substantial meditation */
{
"<html>", L_HTML
},
{
"<HTML>", L_HTML
},
{
"<head>", L_HTML
},
{
"<HEAD>", L_HTML
},
{
"<title>", L_HTML
},
{
"<TITLE>", L_HTML
},
{
"<h1>", L_HTML
},
{
"<H1>", L_HTML
},
{
"<!--", L_HTML
},
{
"<!DOCTYPE HTML", L_HTML
},
{
"/*", L_C
}, /* must precede "The", "the", etc. */
{
"#include", L_C
},
{
"char", L_C
},
{
"The", L_ENG
},
{
"the", L_ENG
},
{
"double", L_C
},
{
"extern", L_C
},
{
"float", L_C
},
{
"real", L_C
},
{
"struct", L_C
},
{
"union", L_C
},
{
"CFLAGS", L_MAKE
},
{
"LDFLAGS", L_MAKE
},
{
"all:", L_MAKE
},
{
".PRECIOUS", L_MAKE
},
/*
* Too many files of text have these words in them. Find another way
* to recognize Fortrash.
*/
#ifdef NOTDEF
{
"subroutine", L_FORT
},
{
"function", L_FORT
},
{
"block", L_FORT
},
{
"common", L_FORT
},
{
"dimension", L_FORT
},
{
"integer", L_FORT
},
{
"data", L_FORT
},
#endif /* NOTDEF */
{
".ascii", L_MACH
},
{
".asciiz", L_MACH
},
{
".byte", L_MACH
},
{
".even", L_MACH
},
{
".globl", L_MACH
},
{
"clr", L_MACH
},
{
"(input,", L_PAS
},
{
"dcl", L_PLI
},
{
"Received:", L_MAIL
},
{
">From", L_MAIL
},
{
"Return-Path:", L_MAIL
},
{
"Cc:", L_MAIL
},
{
"Newsgroups:", L_NEWS
},
{
"Path:", L_NEWS
},
{
"Organization:", L_NEWS
},
{
NULL, 0
}
};
#define NNAMES ((sizeof(names)/sizeof(struct names)) - 1)
/*
* Result String List (RSL)
*
* The file(1) command prints its output. Instead, we store the various
* "printed" strings in a list (allocating memory as we go) and concatenate
* them at the end when we finally know how much space they'll need.
*/
typedef struct magic_rsl_s {
char *str; /* string, possibly a fragment */
struct magic_rsl_s *next; /* pointer to next fragment */
} magic_rsl;
/*
* Apache module configuration structures
*/
/* per-server info */
typedef struct {
char *magicfile; /* where magic be found */
struct magic *magic, /* head of magic config list */
*last;
} magic_server_config_rec;
/* per-request info */
typedef struct {
magic_rsl *head, /* result string list */
*tail;
unsigned suf_recursion; /* recursion depth in suffix check */
} magic_req_rec;
/*
* configuration functions - called by Apache API routines
*/
module mime_magic_module;
extern module mime_module;
static void *
create_magic_server_config(pool * p, server_rec *d)
{
/* allocate the config - use pcalloc because it needs to be zeroed */
return pcalloc(p, sizeof(magic_server_config_rec));
}
static void *
merge_magic_server_config(pool * p, void *basev, void *addv)
{
magic_server_config_rec *base = (magic_server_config_rec *) basev;
magic_server_config_rec *add = (magic_server_config_rec *) addv;
magic_server_config_rec *new = (magic_server_config_rec *)
palloc(p, sizeof(magic_server_config_rec));
new->magicfile = add->magicfile ? add->magicfile : base->magicfile;
if (add->magic && add->last) {
new->magic = add->magic;
new->last = add->last;
}
else if (base->magic && base->last) {
new->magic = base->magic;
new->last = base->last;
}
else {
new->magic = new->last = NULL;
}
return new;
}
static const char *
set_magicfile(cmd_parms * cmd, char *d, char *arg)
{
magic_server_config_rec *conf = (magic_server_config_rec *)
get_module_config(cmd->server->module_config,
&mime_magic_module);
if (!conf) {
return MODNAME ": server structure not allocated";
}
conf->magicfile = arg;
return NULL;
}
/*
* configuration file commands - exported to Apache API
*/
static command_rec mime_magic_cmds[] = {
{"MimeMagicFile", set_magicfile, NULL, RSRC_CONF, TAKE1,
"Path to MIME Magic file (in file(1) format, default " MAGIC ")"},
{NULL}
};
/*
* RSL (result string list) processing routines
*
* These collect strings that would have been printed in fragments by file(1)
* into a list of magic_rsl structures with the strings. When complete,
* they're concatenated together to become the MIME content and encoding
* types.
*
* return value conventions for these functions: functions which return int:
* failure = -1, other = result functions which return pointers: failure = 0,
* other = result
*/
/* allocate a per-request structure and put it in the request record */
static magic_req_rec *
magic_set_config(request_rec * r)
{
magic_req_rec *req_dat = (magic_req_rec *)
palloc(r->pool, sizeof(magic_req_rec));
if (!req_dat) {
log_printf(r->server, "%s: memory allocation failure in "
"magic_set_config()", MODNAME);
return NULL;
}
req_dat->head = req_dat->tail = (magic_rsl *) NULL;
set_module_config(r->request_config, &mime_magic_module, req_dat);
return req_dat;
}
/* add a string to the result string list for this request */
/* it is the responsibility of the caller to allocate "str" */
static int
magic_rsl_add(request_rec * r, char *str)
{
magic_req_rec *req_dat = (magic_req_rec *)
get_module_config(r->request_config, &mime_magic_module);
magic_rsl *rsl;
/* make sure we have a list to put it in */
if (!req_dat) {
log_printf(r->server, "%s: request config should not be NULL",
MODNAME);
if (!(req_dat = magic_set_config(r))) {
/* failure */
return -1;
}
}
/* allocate the list entry */
if (!(rsl = (magic_rsl *) palloc(r->pool, sizeof(magic_rsl)))) {
log_printf(r->server, MODNAME ": "
"memory allocation failure in magic_rsl_add()");
/* failure */
return -1;
}
/* fill it */
rsl->str = str;
rsl->next = (magic_rsl *) NULL;
/* append to the list */
if (req_dat->head && req_dat->tail) {
req_dat->tail->next = rsl;
req_dat->tail = rsl;
}
else {
req_dat->head = req_dat->tail = rsl;
}
/* success */
return 0;
}
/* RSL hook for puts-type functions */
static int
magic_rsl_puts(request_rec * r, char *str)
{
return magic_rsl_add(r, str);
}
/* RSL hook for printf-type functions */
static int
magic_rsl_printf(request_rec * r, char *str,...)
{
va_list ap;
char buf[MAXMIMESTRING];
/* assemble the string into the buffer */
va_start(ap, str);
ap_vsnprintf(buf, sizeof(buf), str, ap);
va_end(ap);
/* add the buffer to the list */
return magic_rsl_add(r, strdup(buf));
}
/* RSL hook for putchar-type functions */
static int
magic_rsl_putchar(request_rec * r, char c)
{
char str[2];
/* high overhead for 1 char - just hope they don't do this much */
str[0] = c;
str[1] = '\0';
return magic_rsl_add(r, str);
}
/* allocate and copy a contiguous string from a result string list */
static char *
rsl_strdup(request_rec * r, int start_frag, int start_pos, int len)
{
char *result; /* return value */
int cur_frag, /* current fragment number/counter */
cur_pos, /* current position within fragment */
res_pos; /* position in result string */
magic_rsl *frag; /* list-traversal pointer */
magic_req_rec *req_dat = (magic_req_rec *)
get_module_config(r->request_config, &mime_magic_module);
/* allocate the result string */
if (!(result = (char *) palloc(r->pool, len + 1))) {
log_printf(r->server, MODNAME ": "
"memory allocation failure in rsl_strdup()");
return NULL;
}
/* loop through and collect the string */
res_pos = 0;
for (frag = req_dat->head, cur_frag = 0;
frag->next;
frag = frag->next, cur_frag++) {
/* loop to the first fragment */
if (cur_frag < start_frag)
continue;
/* loop through and collect chars */
for (cur_pos = (cur_frag == start_frag) ? start_pos : 0;
frag->str[cur_pos];
cur_pos++) {
if (cur_frag >= start_frag
&& cur_pos >= start_pos
&& res_pos <= len) {
result[res_pos++] = frag->str[cur_pos];
if (res_pos > len) {
break;
}
}
}
}
/* clean up and return */
result[res_pos] = 0;
#if MIME_MAGIC_DEBUG
log_printf(r->server, MODNAME ": rsl_strdup() %d chars: %s",
res_pos - 1, result);
#endif
return result;
}
/* states for the state-machine algorithm in magic_rsl_to_request() */
typedef enum {
rsl_leading_space, rsl_type, rsl_subtype, rsl_separator, rsl_encoding
} rsl_states;
/* process the RSL and set the MIME info in the request record */
static int
magic_rsl_to_request(request_rec * r)
{
int cur_frag, /* current fragment number/counter */
cur_pos, /* current position within fragment */
type_frag, /* content type starting point: fragment */
type_pos, /* content type starting point: position */
type_len, /* content type length */
encoding_frag, /* content encoding starting point: fragment */
encoding_pos, /* content encoding starting point: position */
encoding_len; /* content encoding length */
magic_rsl *frag; /* list-traversal pointer */
rsl_states state;
magic_req_rec *req_dat = (magic_req_rec *)
get_module_config(r->request_config, &mime_magic_module);
/* check if we have a result */
if (!req_dat || !req_dat->head) {
/* empty - no match, we defer to other Apache modules */
return DECLINED;
}
/* start searching for the type and encoding */
state = rsl_leading_space;
type_frag = type_pos = type_len = 0;
encoding_frag = encoding_pos = encoding_len = 0;
for (frag = req_dat->head, cur_frag = 0;
frag && frag->next;
frag = frag->next, cur_frag++) {
/* loop through the characters in the fragment */
for (cur_pos = 0; frag->str[cur_pos]; cur_pos++) {
if (isspace(frag->str[cur_pos])) {
/* process whitespace actions for each state */
if (state == rsl_leading_space) {
/* eat whitespace in this state */
continue;
}
else if (state == rsl_type) {
/* whitespace: type has no slash! */
return DECLINED;
}
else if (state == rsl_subtype) {
/* whitespace: end of MIME type */
state++;
continue;
}
else if (state == rsl_separator) {
/* eat whitespace in this state */
continue;
}
else if (state == rsl_encoding) {
/* whitespace: end of MIME encoding */
/* we're done */
frag = req_dat->tail;
break;
}
else {
/* should not be possible */
/* abandon malfunctioning module */
log_printf(r->server,
"%s: bad state %d (ws)",
MODNAME);
return DECLINED;
}
/* NOTREACHED */
}
else if (state == rsl_type &&
frag->str[cur_pos] == '/') {
/* copy the char and go to rsl_subtype state */
type_len++;
state++;
}
else {
/* process non-space actions for each state */
if (state == rsl_leading_space) {
/* non-space: begin MIME type */
state++;
type_frag = cur_frag;
type_pos = cur_pos;
type_len = 1;
continue;
}
else if (state == rsl_type ||
state == rsl_subtype) {
/* non-space: adds to type */
type_len++;
continue;
}
else if (state == rsl_separator) {
/* non-space: begin MIME encoding */
state++;
encoding_frag = cur_frag;
encoding_pos = cur_pos;
encoding_len = 1;
continue;
}
else if (state == rsl_encoding) {
/* non-space: adds to encoding */
encoding_len++;
continue;
}
else {
/* should not be possible */
/* abandon malfunctioning module */
log_printf(r->server,
"%s: bad state %d (ns)",
MODNAME);
return DECLINED;
}
/* NOTREACHED */
}
/* NOTREACHED */
}
}
/* if we ended prior to state rsl_subtype, we had incomplete info */
if (state != rsl_subtype && state != rsl_separator &&
state != rsl_encoding) {
/* defer to other modules */
return DECLINED;
}
/* save the info in the request record */
if (state == rsl_subtype || state == rsl_encoding ||
state == rsl_encoding) {
r->content_type = rsl_strdup(r, type_frag, type_pos, type_len);
}
if (state == rsl_encoding) {
r->content_encoding = rsl_strdup(r, encoding_frag,
encoding_pos, encoding_len);
}
/* detect memory allocation errors */
if (!r->content_type ||
(state == rsl_encoding && !r->content_encoding)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
/* success! */
return OK;
}
/*
* magic_process - process input file r Apache API request record
* (formerly called "process" in file command, prefix added for clarity) Opens
* the file and reads a fixed-size buffer to begin processing the contents.
*/
static void
magic_process(request_rec * r)
{
int fd = 0;
unsigned char buf[HOWMANY + 1]; /* one extra for terminating '\0' */
struct utimbuf utbuf;
struct stat sb;
int nbytes = 0; /* number of bytes read from a datafile */
/*
* first try judging the file based on its filesystem status
*/
if (fsmagic(r, r->filename, &sb) != 0) {
magic_rsl_putchar(r, '\n');
return;
}
if ((fd = open(r->filename, O_RDONLY)) < 0) {
/* We can't open it, but we were able to stat it. */
/*
* if (sb.st_mode & 0002) magic_rsl_puts(r,"writable, "); if
* (sb.st_mode & 0111) magic_rsl_puts(r,"executable, ");
*/
log_printf(r->server, "can't read `%s' (%s).",
r->filename, strerror(errno));
return;
}
/*
* try looking at the first HOWMANY bytes
*/
if ((nbytes = read(fd, (char *) buf, HOWMANY)) == -1) {
log_printf(r->server, "read failed (%s).", strerror(errno));
/* NOTREACHED */
}
if (nbytes == 0)
magic_rsl_puts(r, MIME_TEXT_UNKNOWN);
else {
buf[nbytes++] = '\0'; /* null-terminate it */
tryit(r, buf, nbytes);
}
/*
* Try to restore access, modification times if read it.
*/
utbuf.actime = sb.st_atime;
utbuf.modtime = sb.st_mtime;
(void) utime(r->filename, &utbuf); /* don't care if loses */
(void) close(fd);
(void) magic_rsl_putchar(r, '\n');
}
static void
tryit(request_rec * r, unsigned char *buf, int nb)
{
/*
* Try compression stuff
*/
if (zmagic(r, buf, nb) == 1)
return;
/*
* try tests in /etc/magic (or surrogate magic file)
*/
if (softmagic(r, buf, nb) == 1)
return;
/*
* try known keywords, check for ascii-ness too.
*/
if (ascmagic(r, buf, nb) == 1)
return;
/*
* abandon hope, all ye who remain here
*/
magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
}
#define EATAB {while (isascii((unsigned char) *l) && \
isspace((unsigned char) *l)) ++l;}
/*
* apprentice - load configuration from the magic file r
* API request record
*/
static int
apprentice(server_rec * s, pool * p)
{
FILE *f;
char line[BUFSIZ + 1];
int errs = 0;
int lineno;
#if MIME_MAGIC_DEBUG
int rule = 0;
struct magic *m, *prevm;
#endif
char *fname;
magic_server_config_rec *conf = (magic_server_config_rec *)
get_module_config(s->module_config, &mime_magic_module);
if (!conf->magicfile) {
conf->magicfile = pstrdup(p, MAGIC);
}
fname = server_root_relative(p, conf->magicfile);
f = pfopen(p, fname, "r");
if (f == NULL) {
log_printf(s, "%s: can't read magic file %s: %s",
MODNAME, fname, strerror(errno));
return -1;
}
/* set up the magic list (empty) */
conf->magic = conf->last = NULL;
/* parse it */
for (lineno = 1; fgets(line, BUFSIZ, f) != NULL; lineno++) {
int ws_offset;
/* delete newline */
if (line[0]) {
line[strlen(line) - 1] = '\0';
}
/* skip leading whitespace */
ws_offset = 0;
while (line[ws_offset] && isspace(line[ws_offset])) {
ws_offset++;
}
/* skip blank lines */
if (line[ws_offset] == 0) {
continue;
}
/* comment, do not parse */
if (line[ws_offset] == '#')
continue;
#if MIME_MAGIC_DEBUG
/* if we get here, we're going to use it so count it */
rule++;
#endif
/* parse it */
if (parse(s, p, line + ws_offset, lineno) != 0)
++errs;
}
(void) pfclose(p, f);
#if MIME_MAGIC_DEBUG
log_printf(s,
"%s: apprentice conf=%x file=%s m=%s m->next=%s last=%s",
MODNAME, conf,
conf->magicfile ? conf->magicfile : "NULL",
conf->magic ? "set" : "NULL",
(conf->magic && conf->magic->next) ? "set" : "NULL",
conf->last ? "set" : "NULL");
log_printf(s, "%s: apprentice read %d lines, %d rules, %d errors",
MODNAME, lineno, rule, errs);
#endif
#if MIME_MAGIC_DEBUG
prevm = 0;
log_printf(s, "%s: apprentice test", MODNAME);
for (m = conf->magic; m; m = m->next) {
if (isprint((((unsigned long) m) >> 24) & 255) &&
isprint((((unsigned long) m) >> 16) & 255) &&
isprint((((unsigned long) m) >> 8) & 255) &&
isprint(((unsigned long) m) & 255)) {
log_printf(s, "%s: apprentice: "
"POINTER CLOBBERED! "
"m=\"%c%c%c%c\" line=%d", MODNAME,
(((unsigned long) m) >> 24) & 255,
(((unsigned long) m) >> 16) & 255,
(((unsigned long) m) >> 8) & 255,
((unsigned long) m) & 255,
prevm ? prevm->lineno : -1);
break;
}
prevm = m;
}
#endif
return (errs ? -1 : 0);
}
/*
* extend the sign bit if the comparison is to be signed
*/
static unsigned long
signextend(server_rec * s, struct magic * m, unsigned long v)
{
if (!(m->flag & UNSIGNED))
switch (m->type) {
/*
* Do not remove the casts below. They are vital.
* When later compared with the data, the sign
* extension must have happened.
*/
case BYTE:
v = (char) v;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = (short) v;
break;
case DATE:
case BEDATE:
case LEDATE:
case LONG:
case BELONG:
case LELONG:
v = (long) v;
break;
case STRING:
break;
default:
log_printf(s, "%s: can't happen: m->type=%d",
MODNAME, m->type);
return -1;
}
return v;
}
/*
* parse one line from magic file, put into magic[index++] if valid
*/
static int
parse(server_rec * serv, pool * p, char *l, int lineno)
{
int i = 0;
struct magic *m;
char *t, *s;
magic_server_config_rec *conf = (magic_server_config_rec *)
get_module_config(serv->module_config, &mime_magic_module);
/* allocate magic structure entry */
if ((m = (struct magic *) pcalloc(p, sizeof(struct magic))) == NULL) {
(void) log_printf(serv, "%s: Out of memory.", MODNAME);
return -1;
}
/* append to linked list */
m->next = NULL;
if (!conf->magic || !conf->last) {
conf->magic = conf->last = m;
}
else {
conf->last->next = m;
conf->last = m;
}
/* set values in magic structure */
m->flag = 0;
m->cont_level = 0;
m->lineno = lineno;
while (*l == '>') {
++l; /* step over */
m->cont_level++;
}
if (m->cont_level != 0 && *l == '(') {
++l; /* step over */
m->flag |= INDIR;
}
/* get offset, then skip over it */
m->offset = (int) strtol(l, &t, 0);
if (l == t) {
log_printf(serv, "%s: offset %s invalid", MODNAME, l);
}
l = t;
if (m->flag & INDIR) {
m->in.type = LONG;
m->in.offset = 0;
/*
* read [.lbs][+-]nnnnn)
*/
if (*l == '.') {
switch (*++l) {
case 'l':
m->in.type = LONG;
break;
case 's':
m->in.type = SHORT;
break;
case 'b':
m->in.type = BYTE;
break;
default:
log_printf(serv, "%s: indirect offset type %c invalid", MODNAME, *l);
break;
}
l++;
}
s = l;
if (*l == '+' || *l == '-')
l++;
if (isdigit((unsigned char) *l)) {
m->in.offset = strtol(l, &t, 0);
if (*s == '-')
m->in.offset = -m->in.offset;
}
else
t = l;
if (*t++ != ')') {
log_printf(serv, "%s: missing ')' in indirect offset",
MODNAME);
}
l = t;
}
while (isascii((unsigned char) *l) && isdigit((unsigned char) *l))
++l;
EATAB;
#define NBYTE 4
#define NSHORT 5
#define NLONG 4
#define NSTRING 6
#define NDATE 4
#define NBESHORT 7
#define NBELONG 6
#define NBEDATE 6
#define NLESHORT 7
#define NLELONG 6
#define NLEDATE 6
if (*l == 'u') {
++l;
m->flag |= UNSIGNED;
}
/* get type, skip it */
if (strncmp(l, "byte", NBYTE) == 0) {
m->type = BYTE;
l += NBYTE;
}
else if (strncmp(l, "short", NSHORT) == 0) {
m->type = SHORT;
l += NSHORT;
}
else if (strncmp(l, "long", NLONG) == 0) {
m->type = LONG;
l += NLONG;
}
else if (strncmp(l, "string", NSTRING) == 0) {
m->type = STRING;
l += NSTRING;
}
else if (strncmp(l, "date", NDATE) == 0) {
m->type = DATE;
l += NDATE;
}
else if (strncmp(l, "beshort", NBESHORT) == 0) {
m->type = BESHORT;
l += NBESHORT;
}
else if (strncmp(l, "belong", NBELONG) == 0) {
m->type = BELONG;
l += NBELONG;
}
else if (strncmp(l, "bedate", NBEDATE) == 0) {
m->type = BEDATE;
l += NBEDATE;
}
else if (strncmp(l, "leshort", NLESHORT) == 0) {
m->type = LESHORT;
l += NLESHORT;
}
else if (strncmp(l, "lelong", NLELONG) == 0) {
m->type = LELONG;
l += NLELONG;
}
else if (strncmp(l, "ledate", NLEDATE) == 0) {
m->type = LEDATE;
l += NLEDATE;
}
else {
log_printf(serv, "%s: type %s invalid", MODNAME, l);
return -1;
}
/* New-style anding: "0 byte&0x80 =0x80 dynamically linked" */
if (*l == '&') {
++l;
m->mask = signextend(serv, m, strtol(l, &l, 0));
}
else
m->mask = ~0L;
EATAB;
switch (*l) {
case '>':
case '<':
/* Old-style anding: "0 byte &0x80 dynamically linked" */
case '&':
case '^':
case '=':
m->reln = *l;
++l;
break;
case '!':
if (m->type != STRING) {
m->reln = *l;
++l;
break;
}
/* FALL THROUGH */
default:
if (*l == 'x' && isascii((unsigned char) l[1]) &&
isspace((unsigned char) l[1])) {
m->reln = *l;
++l;
goto GetDesc; /* Bill The Cat */
}
m->reln = '=';
break;
}
EATAB;
if (getvalue(serv, m, &l))
return -1;
/*
* now get last part - the description
*/
GetDesc:
EATAB;
if (l[0] == '\b') {
++l;
m->nospflag = 1;
}
else if ((l[0] == '\\') && (l[1] == 'b')) {
++l;
++l;
m->nospflag = 1;
}
else
m->nospflag = 0;
while ((m->desc[i++] = *l++) != '\0' && i < MAXDESC)
/* NULLBODY */ ;
#if MIME_MAGIC_DEBUG
log_printf(serv, "%s: parse line=%d m=%x next=%x cont=%d desc=%s",
MODNAME, lineno, m, m->next, m->cont_level,
m->desc ? m->desc : "NULL");
#endif /* MIME_MAGIC_DEBUG */
return 0;
}
/*
* Read a numeric value from a pointer, into the value union of a magic
* pointer, according to the magic type. Update the string pointer to point
* just after the number read. Return 0 for success, non-zero for failure.
*/
static int
getvalue(server_rec * s, struct magic * m, char **p)
{
int slen;
if (m->type == STRING) {
*p = getstr(s, *p, m->value.s, sizeof(m->value.s), &slen);
m->vallen = slen;
}
else if (m->reln != 'x')
m->value.l = signextend(s, m, strtol(*p, p, 0));
return 0;
}
/*
* Convert a string containing C character escapes. Stop at an unescaped
* space or tab. Copy the converted version to "p", returning its length in
* *slen. Return updated scan pointer as function result.
*/
static char *
getstr(server_rec *serv, register char *s, register char *p,
int plen, int *slen)
{
char *origs = s, *origp = p;
char *pmax = p + plen - 1;
register int c;
register int val;
while ((c = *s++) != '\0') {
if (isspace((unsigned char) c))
break;
if (p >= pmax) {
log_printf(serv, "String too long: %s", origs);
break;
}
if (c == '\\') {
switch (c = *s++) {
case '\0':
goto out;
default:
*p++ = (char) c;
break;
case 'n':
*p++ = '\n';
break;
case 'r':
*p++ = '\r';
break;
case 'b':
*p++ = '\b';
break;
case 't':
*p++ = '\t';
break;
case 'f':
*p++ = '\f';
break;
case 'v':
*p++ = '\v';
break;
/* \ and up to 3 octal digits */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
val = c - '0';
c = *s++; /* try for 2 */
if (c >= '0' && c <= '7') {
val = (val << 3) | (c - '0');
c = *s++; /* try for 3 */
if (c >= '0' && c <= '7')
val = (val << 3) | (c - '0');
else
--s;
}
else
--s;
*p++ = (char) val;
break;
/* \x and up to 3 hex digits */
case 'x':
val = 'x'; /* Default if no digits */
c = hextoint(*s++); /* Get next char */
if (c >= 0) {
val = c;
c = hextoint(*s++);
if (c >= 0) {
val = (val << 4) + c;
c = hextoint(*s++);
if (c >= 0) {
val = (val << 4) + c;
}
else
--s;
}
else
--s;
}
else
--s;
*p++ = (char) val;
break;
}
}
else
*p++ = (char) c;
}
out:
*p = '\0';
*slen = p - origp;
return s;
}
/* Single hex char to int; -1 if not a hex char. */
static int
hextoint(c)
int c;
{
if (!isascii((unsigned char) c))
return -1;
if (isdigit((unsigned char) c))
return c - '0';
if ((c >= 'a') && (c <= 'f'))
return c + 10 - 'a';
if ((c >= 'A') && (c <= 'F'))
return c + 10 - 'A';
return -1;
}
static int
fsmagic(request_rec * r, const char *fn, struct stat * sb)
{
int ret = 0;
/*
* Fstat is cheaper but fails for files you don't have read perms on.
* On 4.2BSD and similar systems, use lstat() to identify symlinks.
*/
ret = stat(fn, sb); /* don't merge into if; see "ret =" above */
if (ret) {
return 1;
}
/*
* if (sb->st_mode & S_ISUID) magic_rsl_puts(r,"setuid "); if
* (sb->st_mode & S_ISGID) magic_rsl_puts(r,"setgid "); if
* (sb->st_mode & S_ISVTX) magic_rsl_puts(r,"sticky ");
*/
switch (sb->st_mode & S_IFMT) {
case S_IFDIR:
magic_rsl_puts(r, DIR_MAGIC_TYPE);
return 1;
case S_IFCHR:
/*
* (void) magic_rsl_printf(r,"character special (%d/%d)",
* major(sb->st_rdev), minor(sb->st_rdev));
*/
(void) magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
case S_IFBLK:
/*
* (void) magic_rsl_printf(r,"block special (%d/%d)",
* major(sb->st_rdev), minor(sb->st_rdev));
*/
(void) magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
/* TODO add code to handle V7 MUX and Blit MUX files */
#ifdef S_IFIFO
case S_IFIFO:
/*
* magic_rsl_puts(r,"fifo (named pipe)");
*/
(void) magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
#endif
#ifdef S_IFLNK
case S_IFLNK:
{
char buf[BUFSIZ + 4];
register int nch;
struct stat tstatbuf;
if ((nch = readlink(fn, buf, BUFSIZ - 1)) <= 0) {
/*
* magic_rsl_printf(r, "unreadable symlink
* (%s).", strerror(errno));
*/
magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
}
buf[nch] = '\0'; /* readlink(2) forgets this */
/* If broken symlink, say so and quit early. */
if (*buf == '/') {
if (stat(buf, &tstatbuf) < 0) {
/*
* magic_rsl_printf(r, "broken
* symbolic link to %s", buf);
*/
magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
}
}
else {
char *tmp;
char buf2[BUFSIZ + BUFSIZ + 4];
if ((tmp = strrchr(fn, '/')) == NULL) {
tmp = buf; /* in current directory
* anyway */
}
else {
/* directory part plus (relative) symlink */
ap_snprintf(buf2, sizeof(buf2), "%s%s",
fn, buf);
tmp = buf2;
}
if (stat(tmp, &tstatbuf) < 0) {
/*
* magic_rsl_printf(r, "broken
* symbolic link to %s", buf);
*/
magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
}
}
/* At MIME-typing time we want to follow symlinks */
/* So just handle it. */
magic_process(r);
return 1;
}
return 1;
#endif
#ifdef S_IFSOCK
#ifndef __COHERENT__
case S_IFSOCK:
magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
return 1;
#endif
#endif
case S_IFREG:
break;
default:
log_printf(r->server, "%s: invalid mode 0%o.", MODNAME,
sb->st_mode);
/* NOTREACHED */
}
/*
* regular file, check next possibility
*/
if (sb->st_size == 0) {
magic_rsl_puts(r, MIME_TEXT_UNKNOWN);
return 1;
}
return 0;
}
/*
* softmagic - lookup one file in database (already read from /etc/magic by
* apprentice.c). Passed the name and FILE * of one file to be typed.
*/
/* ARGSUSED1 *//* nbytes passed for regularity, maybe need later */
static int
softmagic(request_rec * r, unsigned char *buf, int nbytes)
{
if (match(r, buf, nbytes))
return 1;
return 0;
}
/*
* Go through the whole list, stopping if you find a match. Process all the
* continuations of that match before returning.
*
* We support multi-level continuations:
*
* At any time when processing a successful top-level match, there is a current
* continuation level; it represents the level of the last successfully
* matched continuation.
*
* Continuations above that level are skipped as, if we see one, it means that
* the continuation that controls them - i.e, the lower-level continuation
* preceding them - failed to match.
*
* Continuations below that level are processed as, if we see one, it means
* we've finished processing or skipping higher-level continuations under the
* control of a successful or unsuccessful lower-level continuation, and are
* now seeing the next lower-level continuation and should process it. The
* current continuation level reverts to the level of the one we're seeing.
*
* Continuations at the current level are processed as, if we see one, there's
* no lower-level continuation that may have failed.
*
* If a continuation matches, we bump the current continuation level so that
* higher-level continuations are processed.
*/
static int
match(request_rec * r, unsigned char *s, int nbytes)
{
#if MIME_MAGIC_DEBUG
int rule_counter = 0;
#endif
int cont_level = 0;
int need_separator = 0;
union VALUETYPE p;
magic_server_config_rec *conf = (magic_server_config_rec *)
get_module_config(r->server->module_config, &mime_magic_module);
struct magic *m;
#if MIME_MAGIC_DEBUG
log_printf(r->server,
"%s: match conf=%x file=%s m=%s m->next=%s last=%s",
MODNAME, conf,
conf->magicfile ? conf->magicfile : "NULL",
conf->magic ? "set" : "NULL",
(conf->magic && conf->magic->next) ? "set" : "NULL",
conf->last ? "set" : "NULL");
#endif
#if MIME_MAGIC_DEBUG
for (m = conf->magic; m; m = m->next) {
if (isprint((((unsigned long) m) >> 24) & 255) &&
isprint((((unsigned long) m) >> 16) & 255) &&
isprint((((unsigned long) m) >> 8) & 255) &&
isprint(((unsigned long) m) & 255)) {
log_printf(r->server, "%s: match: POINTER CLOBBERED! "
"m=\"%c%c%c%c\"", MODNAME,
(((unsigned long) m) >> 24) & 255,
(((unsigned long) m) >> 16) & 255,
(((unsigned long) m) >> 8) & 255,
((unsigned long) m) & 255);
break;
}
}
#endif
for (m = conf->magic; m; m = m->next) {
#if MIME_MAGIC_DEBUG
rule_counter++;
log_printf(r->server, "%s: line=%d desc=%s", MODNAME,
m->lineno, m->desc);
#endif
/* check if main entry matches */
if (!mget(r, &p, s, m, nbytes) ||
!mcheck(r, &p, m)) {
struct magic *m_cont;
/*
* main entry didn't match, flush its continuations
*/
if (!m->next || (m->next->cont_level == 0)) {
continue;
}
m_cont = m->next;
while (m_cont && (m_cont->cont_level != 0)) {
#if MIME_MAGIC_DEBUG
rule_counter++;
log_printf(r->server,
"%s: line=%d mc=%x mc->next=%x "
"cont=%d desc=%s",
MODNAME, m_cont->lineno, m_cont,
m_cont->next, m_cont->cont_level,
m_cont->desc ? m_cont->desc : "NULL");
#endif
/*
* this trick allows us to keep *m in sync
* when the continue advances the pointer
*/
m = m_cont;
m_cont = m_cont->next;
}
continue;
}
/* if we get here, the main entry rule was a match */
/* this will be the last run through the loop */
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: rule matched, line=%d type=%d %s",
MODNAME, m->lineno, m->type,
(m->type == STRING) ? m->value.s : "");
#endif
/* print the match */
mprint(r, &p, m);
/*
* If we printed something, we'll need to print a blank
* before we print something else.
*/
if (m->desc[0])
need_separator = 1;
/* and any continuations that match */
cont_level++;
/*
* while (m && m->next && m->next->cont_level != 0 && ( m =
* m->next ))
*/
m = m->next;
while (m && (m->cont_level != 0)) {
#if MIME_MAGIC_DEBUG
log_printf(r->server,
"%s: match line=%d cont=%d type=%d %s",
MODNAME, m->lineno, m->cont_level, m->type,
(m->type == STRING) ? m->value.s : "");
#endif
if (cont_level >= m->cont_level) {
if (cont_level > m->cont_level) {
/*
* We're at the end of the level
* "cont_level" continuations.
*/
cont_level = m->cont_level;
}
if (mget(r, &p, s, m, nbytes) &&
mcheck(r, &p, m)) {
/*
* This continuation matched. Print
* its message, with a blank before
* it if the previous item printed
* and this item isn't empty.
*/
/* space if previous printed */
if (need_separator
&& (m->nospflag == 0)
&& (m->desc[0] != '\0')
) {
(void) magic_rsl_putchar(r, ' ');
need_separator = 0;
}
mprint(r, &p, m);
if (m->desc[0])
need_separator = 1;
/*
* If we see any continuations at a
* higher level, process them.
*/
cont_level++;
}
}
/* move to next continuation record */
m = m->next;
}
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: matched after %d rules",
MODNAME, rule_counter);
#endif
return 1; /* all through */
}
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: failed after %d rules", MODNAME, rule_counter);
#endif
return 0; /* no match at all */
}
static void
mprint(request_rec * r, union VALUETYPE * p, struct magic * m)
{
char *pp, *rt;
unsigned long v;
switch (m->type) {
case BYTE:
v = p->b;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = p->h;
break;
case LONG:
case BELONG:
case LELONG:
v = p->l;
break;
case STRING:
if (m->reln == '=') {
(void) magic_rsl_printf(r, m->desc, m->value.s);
}
else {
(void) magic_rsl_printf(r, m->desc, p->s);
}
return;
case DATE:
case BEDATE:
case LEDATE:
pp = ctime((time_t *) & p->l);
if ((rt = strchr(pp, '\n')) != NULL)
*rt = '\0';
(void) magic_rsl_printf(r, m->desc, pp);
return;
default:
log_printf(r->server, "%s: invalid m->type (%d) in mprint().",
MODNAME, m->type);
return;
}
v = signextend(r->server, m, v) & m->mask;
(void) magic_rsl_printf(r, m->desc, (unsigned long) v);
}
/*
* Convert the byte order of the data we are looking at
*/
static int
mconvert(request_rec * r, union VALUETYPE * p, struct magic * m)
{
char *rt;
switch (m->type) {
case BYTE:
case SHORT:
case LONG:
case DATE:
return 1;
case STRING:
/* Null terminate and eat the return */
p->s[sizeof(p->s) - 1] = '\0';
if ((rt = strchr(p->s, '\n')) != NULL)
*rt = '\0';
return 1;
case BESHORT:
p->h = (short) ((p->hs[0] << 8) | (p->hs[1]));
return 1;
case BELONG:
case BEDATE:
p->l = (long)
((p->hl[0] << 24) | (p->hl[1] << 16) | (p->hl[2] << 8) | (p->hl[3]));
return 1;
case LESHORT:
p->h = (short) ((p->hs[1] << 8) | (p->hs[0]));
return 1;
case LELONG:
case LEDATE:
p->l = (long)
((p->hl[3] << 24) | (p->hl[2] << 16) | (p->hl[1] << 8) | (p->hl[0]));
return 1;
default:
log_printf(r->server, "%s: invalid type %d in mconvert().",
MODNAME, m->type);
return 0;
}
}
static int
mget(request_rec * r, union VALUETYPE * p, unsigned char *s, struct magic * m,
int nbytes)
{
long offset = m->offset;
if (offset + sizeof(union VALUETYPE) > nbytes)
return 0;
memcpy(p, s + offset, sizeof(union VALUETYPE));
if (!mconvert(r, p, m))
return 0;
if (m->flag & INDIR) {
switch (m->in.type) {
case BYTE:
offset = p->b + m->in.offset;
break;
case SHORT:
offset = p->h + m->in.offset;
break;
case LONG:
offset = p->l + m->in.offset;
break;
}
if (offset + sizeof(union VALUETYPE) > nbytes)
return 0;
memcpy(p, s + offset, sizeof(union VALUETYPE));
if (!mconvert(r, p, m))
return 0;
}
return 1;
}
static int
mcheck(request_rec * r, union VALUETYPE * p, struct magic * m)
{
register unsigned long l = m->value.l;
register unsigned long v;
int matched;
if ((m->value.s[0] == 'x') && (m->value.s[1] == '\0')) {
log_printf(r->server, "BOINK");
return 1;
}
switch (m->type) {
case BYTE:
v = p->b;
break;
case SHORT:
case BESHORT:
case LESHORT:
v = p->h;
break;
case LONG:
case BELONG:
case LELONG:
case DATE:
case BEDATE:
case LEDATE:
v = p->l;
break;
case STRING:
l = 0;
/*
* What we want here is: v = strncmp(m->value.s, p->s,
* m->vallen); but ignoring any nulls. bcmp doesn't give
* -/+/0 and isn't universally available anyway.
*/
v = 0;
{
register unsigned char *a = (unsigned char *) m->value.s;
register unsigned char *b = (unsigned char *) p->s;
register int len = m->vallen;
while (--len >= 0)
if ((v = *b++ - *a++) != 0)
break;
}
break;
default:
log_printf(r->server, "%s: invalid type %d in mcheck().",
MODNAME, m->type);
return 0; /* NOTREACHED */
}
v = signextend(r->server, m, v) & m->mask;
switch (m->reln) {
case 'x':
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%lu == *any* = 1", v);
#endif
matched = 1;
break;
case '!':
matched = v != l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%lu != %lu = %d",
v, l, matched);
#endif
break;
case '=':
matched = v == l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%lu == %lu = %d",
v, l, matched);
#endif
break;
case '>':
if (m->flag & UNSIGNED) {
matched = v > l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%lu > %lu = %d",
v, l, matched);
#endif
}
else {
matched = (long) v > (long) l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%ld > %ld = %d",
v, l, matched);
#endif
}
break;
case '<':
if (m->flag & UNSIGNED) {
matched = v < l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%lu < %lu = %d", v, l, matched);
#endif
}
else {
matched = (long) v < (long) l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%ld < %ld = %d", v, l, matched);
#endif
}
break;
case '&':
matched = (v & l) == l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "((%lx & %lx) == %lx) = %d",
v, l, l, matched);
#endif
break;
case '^':
matched = (v & l) != l;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "((%lx & %lx) != %lx) = %d",
v, l, l, matched);
#endif
break;
default:
matched = 0;
log_printf(r->server, "%s: mcheck: can't happen: invalid relation %d.", MODNAME, m->reln);
break; /* NOTREACHED */
}
return matched;
}
/* an optimization over plain strcmp() */
#define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0)
static int
ascmagic(request_rec * r, unsigned char *buf, int nbytes)
{
int i, has_escapes = 0;
unsigned char *s;
char nbuf[HOWMANY + 1]; /* one extra for terminating '\0' */
char *token;
register struct names *p;
/* these are easy, do them first */
/*
* for troff, look for . + letter + letter or .\"; this must be done
* to disambiguate tar archives' ./file and other trash from real
* troff input.
*/
if (*buf == '.') {
unsigned char *tp = buf + 1;
while (isascii(*tp) && isspace(*tp))
++tp; /* skip leading whitespace */
if ((isascii(*tp) && (isalnum(*tp) || *tp == '\\') &&
isascii(*(tp + 1)) && (isalnum(*(tp + 1)) || *tp == '"'))) {
magic_rsl_puts(r, "application/x-troff");
return 1;
}
}
if ((*buf == 'c' || *buf == 'C') &&
isascii(*(buf + 1)) && isspace(*(buf + 1))) {
/* Fortran */
magic_rsl_puts(r, "text/plain");
return 1;
}
/* look for tokens from names.h - this is expensive! */
/* make a copy of the buffer here because strtok() will destroy it */
s = (unsigned char *) memcpy(nbuf, buf, nbytes);
s[nbytes] = '\0';
has_escapes = (memchr(s, '\033', nbytes) != NULL);
while ((token = strtok((char *) s, " \t\n\r\f")) != NULL) {
s = NULL; /* make strtok() keep on tokin' */
for (p = names; p < names + NNAMES; p++) {
if (STREQ(p->name, token)) {
magic_rsl_puts(r, types[p->type]);
if (has_escapes)
magic_rsl_puts(r, " (with escape sequences)");
return 1;
}
}
}
switch (is_tar(buf, nbytes)) {
case 1:
/* V7 tar archive */
magic_rsl_puts(r, "application/x-tar");
return 1;
case 2:
/* POSIX tar archive */
magic_rsl_puts(r, "application/x-tar");
return 1;
}
for (i = 0; i < nbytes; i++) {
if (!isascii(*(buf + i)))
return 0; /* not all ascii */
}
/* all else fails, but it is ascii... */
if (has_escapes) {
/* text with escape sequences */
/* we leave this open for further differentiation later */
magic_rsl_puts(r, "text/plain");
}
else {
/* plain text */
magic_rsl_puts(r, "text/plain");
}
return 1;
}
/*
* compress routines: zmagic() - returns 0 if not recognized, uncompresses
* and prints information if recognized uncompress(s, method, old, n, newch)
* - uncompress old into new, using method, return sizeof new
*/
static struct {
char *magic;
int maglen;
char *argv[3];
int silent;
char *encoding;
} compr[] = {
{
"\037\235", 2, {
"uncompress", "-c", NULL
}, 0, "x-compress"
},
{
"\037\213", 2, {
"gzip", "-dq", NULL
}, 1, "x-gzip"
},
/*
* XXX pcat does not work, cause I don't know how to make it read
* stdin, so we use gzip
*/
{
"\037\036", 2, {
"gzip", "-dq", NULL
}, 0, "x-gzip"
},
};
static int ncompr = sizeof(compr) / sizeof(compr[0]);
static int
zmagic(request_rec * r, unsigned char *buf, int nbytes)
{
unsigned char *newbuf;
int newsize;
int i;
for (i = 0; i < ncompr; i++) {
if (nbytes < compr[i].maglen)
continue;
if (memcmp(buf, compr[i].magic, compr[i].maglen) == 0)
break;
}
if (i == ncompr)
return 0;
if ((newsize = uncompress(r, i, buf, &newbuf, nbytes)) != 0) {
tryit(r, newbuf, newsize);
/* set encoding type in the request record */
r->content_encoding = pstrdup(r->pool, compr[i].encoding);
}
return 1;
}
static int
uncompress(request_rec *r, int method, const unsigned char *old,
unsigned char **newch, int n)
{
int fdin[2], fdout[2];
if (pipe(fdin) == -1 || pipe(fdout) == -1) {
log_printf(r->server, "%s: cannot create pipe (%s).",
MODNAME, strerror(errno));
return -1;
}
switch (fork()) {
case 0: /* child */
(void) close(STDIN_FILENO);
(void) dup(fdin[0]);
(void) close(fdin[0]);
(void) close(fdin[1]);
(void) close(STDOUT_FILENO);
(void) dup(fdout[1]);
(void) close(fdout[0]);
(void) close(fdout[1]);
if (compr[method].silent)
(void) close(STDERR_FILENO);
execvp(compr[method].argv[0], compr[method].argv);
log_printf(r->server, "%s: could not execute `%s' (%s).", MODNAME,
compr[method].argv[0], strerror(errno));
return -1;
case -1:
log_printf(r->server, "%s: could not fork (%s).", MODNAME,
strerror(errno));
return -1;
default: /* parent */
(void) close(fdin[0]);
(void) close(fdout[1]);
if (write(fdin[1], old, n) != n) {
log_printf(r->server, "%s: write failed (%s).", MODNAME,
strerror(errno));
return -1;
}
(void) close(fdin[1]);
if ((*newch = (unsigned char *) palloc(r->pool, n)) == NULL) {
log_printf(r->server, "%s: out of memory in uncompress()",
MODNAME);
return -1;
}
if ((n = read(fdout[0], *newch, n)) <= 0) {
log_printf(r->server, "%s: read failed (%s).", MODNAME,
strerror(errno));
return -1;
}
(void) close(fdout[0]);
(void) wait(NULL);
return n;
}
}
/*
* is_tar() -- figure out whether file is a tar archive.
*
* Stolen (by author of file utility) from the public domain tar program: Public
* Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
*
* @(#)list.c 1.18 9/23/86 Public Domain - gnu $Id: mod_mime_magic.c,v 1.7
* 1997/06/24 00:41:02 ikluft Exp ikluft $
*
* Comments changed and some code/comments reformatted for file command by Ian
* Darwin.
*/
#define isodigit(c) ( ((c) >= '0') && ((c) <= '7') )
/*
* Return 0 if the checksum is bad (i.e., probably not a tar archive), 1 for
* old UNIX tar file, 2 for Unix Std (POSIX) tar file.
*/
static int
is_tar(buf, nbytes)
unsigned char *buf;
int nbytes;
{
register union record *header = (union record *) buf;
register int i;
register long sum, recsum;
register char *p;
if (nbytes < sizeof(union record))
return 0;
recsum = from_oct(8, header->header.chksum);
sum = 0;
p = header->charptr;
for (i = sizeof(union record); --i >= 0;) {
/*
* We can't use unsigned char here because of old compilers,
* e.g. V7.
*/
sum += 0xFF & *p++;
}
/* Adjust checksum to count the "chksum" field as blanks. */
for (i = sizeof(header->header.chksum); --i >= 0;)
sum -= 0xFF & header->header.chksum[i];
sum += ' ' * sizeof header->header.chksum;
if (sum != recsum)
return 0; /* Not a tar archive */
if (0 == strcmp(header->header.magic, TMAGIC))
return 2; /* Unix Standard tar archive */
return 1; /* Old fashioned tar archive */
}
/*
* Quick and dirty octal conversion.
*
* Result is -1 if the field is invalid (all blank, or nonoctal).
*/
static long
from_oct(int digs, char *where)
{
register long value;
while (isspace(*where)) { /* Skip spaces */
where++;
if (--digs <= 0)
return -1; /* All blank field */
}
value = 0;
while (digs > 0 && isodigit(*where)) { /* Scan til nonoctal */
value = (value << 3) | (*where++ - '0');
--digs;
}
if (digs > 0 && *where && !isspace(*where))
return -1; /* Ended on non-space/nul */
return value;
}
/*
* Check for file-revision suffix
*
* This is for an obscure document control system used on an intranet.
* The web representation of each file's revision has an @1, @2, etc
* appended with the revision number. This needs to be stripped off to
* find the file suffix, which can be recognized by sending the name back
* through a sub-request. The base file name (without the @num suffix)
* must exist because its type will be used as the result.
*/
static int
revision_suffix(request_rec * r)
{
int suffix_pos, result;
char *sub_filename;
request_rec *sub;
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: revision_suffix checking%s", MODNAME,
r->filename);
#endif /* MIME_MAGIC_DEBUG */
/* check for recognized revision suffix */
suffix_pos = strlen(r->filename) - 1;
if (!isdigit(r->filename[suffix_pos])) {
return 0;
}
while (suffix_pos >= 0 && isdigit(r->filename[suffix_pos]))
suffix_pos--;
if (suffix_pos < 0 || r->filename[suffix_pos] != '@') {
return 0;
}
/* perform sub-request for the file name without the suffix */
result = 0;
sub_filename = pstrndup(r->pool, r->filename, suffix_pos);
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: subrequest lookup for %s", MODNAME, sub_filename);
#endif /* MIME_MAGIC_DEBUG */
sub = sub_req_lookup_file(sub_filename, r);
/* extract content type/encoding/language from sub-request */
if (sub->content_type) {
r->content_type = pstrdup(r->pool, sub->content_type);
#if MIME_MAGIC_DEBUG
log_printf(r->server, "%s: subrequest %s got %s", MODNAME,
sub_filename, r->content_type);
#endif /* MIME_MAGIC_DEBUG */
if (sub->content_encoding)
r->content_encoding =
pstrdup(r->pool, sub->content_encoding);
if (sub->content_language)
r->content_language =
pstrdup(r->pool, sub->content_language);
result = 1;
}
/* clean up */
destroy_sub_req(sub);
return result;
}
/*
* initialize the module
*/
static void
magic_init(server_rec * s, pool * p)
{
int result;
magic_server_config_rec *conf = (magic_server_config_rec *)
get_module_config(s->module_config, &mime_magic_module);
#if MIME_MAGIC_DEBUG
struct magic *m, *prevm;
#endif /* MIME_MAGIC_DEBUG */
/* on the first time through we read the magic file */
if (conf->magicfile && !conf->magic) {
result = apprentice(s, p);
if (result == -1)
return;
#if MIME_MAGIC_DEBUG
prevm = 0;
log_printf(s, "%s: magic_init 1 test", MODNAME);
for (m = conf->magic; m; m = m->next) {
if (isprint((((unsigned long) m) >> 24) & 255) &&
isprint((((unsigned long) m) >> 16) & 255) &&
isprint((((unsigned long) m) >> 8) & 255) &&
isprint(((unsigned long) m) & 255)) {
log_printf(s, "%s: magic_init 1: "
"POINTER CLOBBERED! "
"m=\"%c%c%c%c\" line=%d", MODNAME,
(((unsigned long) m) >> 24) & 255,
(((unsigned long) m) >> 16) & 255,
(((unsigned long) m) >> 8) & 255,
((unsigned long) m) & 255,
prevm ? prevm->lineno : -1);
break;
}
prevm = m;
}
#endif
}
if (!conf->magic)
return;
return;
}
/*
* Find the Content-Type from any resource this module has available
*/
static int
magic_find_ct(request_rec * r)
{
int result;
/* was someone else already here? */
if (r->content_type) {
return DECLINED;
}
/* make sure mime_module was called first - it's cheaper! */
if (mime_module.type_checker) {
result = (mime_module.type_checker) (r);
if (result == OK) {
return OK;
}
}
/* initialize per-request info */
if (!magic_set_config(r)) {
return HTTP_INTERNAL_SERVER_ERROR;
}
/* try excluding file-revision suffixes */
if (revision_suffix(r) != 1) {
/* process it based on the file contents */
magic_process(r);
}
/* if we have any results, put them in the request structure */
return magic_rsl_to_request(r);
}
/*
* Apache API module interface
*/
module mime_magic_module = {
STANDARD_MODULE_STUFF,
magic_init, /* initializer */
NULL, /* dir config creator */
NULL, /* dir merger --- default is to override */
create_magic_server_config, /* server config */
merge_magic_server_config, /* merge server config */
mime_magic_cmds, /* command table */
NULL, /* handlers */
NULL, /* filename translation */
NULL, /* check_user_id */
NULL, /* check auth */
NULL, /* check access */
magic_find_ct, /* type_checker */
NULL, /* fixups */
NULL, /* logger */
NULL /* child_init */
};
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.