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mod_mime_magic.c
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mod_mime_magic.c
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/* 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 <[email protected]>
* 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 */
{
"<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 {
const 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 {
const char *magicfile; /* where magic be found */
struct magic *magic; /* head of magic config list */
struct magic *last;
} magic_server_config_rec;
/* per-request info */
typedef struct {
magic_rsl *head; /* result string list */
magic_rsl *tail;
} magic_req_rec;
/*
* configuration functions - called by Apache API routines
*/
module AP_MODULE_DECLARE_DATA mime_magic_module;
static void *create_magic_server_config(apr_pool_t *p, server_rec *d)
{
/* allocate the config - use pcalloc because it needs to be zeroed */
return apr_pcalloc(p, sizeof(magic_server_config_rec));
}
static void *merge_magic_server_config(apr_pool_t *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 *)
apr_palloc(p, sizeof(magic_server_config_rec));
new->magicfile = add->magicfile ? add->magicfile : base->magicfile;
new->magic = NULL;
new->last = NULL;
return new;
}
static const char *set_magicfile(cmd_parms *cmd, void *dummy, const char *arg)
{
magic_server_config_rec *conf = (magic_server_config_rec *)
ap_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 const command_rec mime_magic_cmds[] =
{
AP_INIT_TAKE1("MimeMagicFile", set_magicfile, NULL, RSRC_CONF,
"Path to MIME Magic file (in file(1) format)"),
{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 *) apr_palloc(r->pool,
sizeof(magic_req_rec));
req_dat->head = req_dat->tail = (magic_rsl *) NULL;
ap_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, const char *str)
{
magic_req_rec *req_dat = (magic_req_rec *)
ap_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) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, APR_EINVAL, r, APLOGNO(01507)
MODNAME ": request config should not be NULL");
if (!(req_dat = magic_set_config(r))) {
/* failure */
return -1;
}
}
/* allocate the list entry */
rsl = (magic_rsl *) apr_palloc(r->pool, sizeof(magic_rsl));
/* 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, const 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);
apr_vsnprintf(buf, sizeof(buf), str, ap);
va_end(ap);
/* add the buffer to the list */
return magic_rsl_add(r, apr_pstrdup(r->pool, 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, apr_pstrdup(r->pool, 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 *)
ap_get_module_config(r->request_config, &mime_magic_module);
/* allocate the result string */
result = (char *) apr_palloc(r->pool, len + 1);
/* 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
ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01508)
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 */
char *tmp;
magic_rsl *frag; /* list-traversal pointer */
rsl_states state;
magic_req_rec *req_dat = (magic_req_rec *)
ap_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 (apr_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 */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01509)
MODNAME ": bad state %d (ws)", state);
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 */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01510)
MODNAME ": bad state %d (ns)", state);
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 */
tmp = rsl_strdup(r, type_frag, type_pos, type_len);
/* XXX: this could be done at config time I'm sure... but I'm
* confused by all this magic_rsl stuff. -djg */
ap_content_type_tolower(tmp);
ap_set_content_type_ex(r, tmp, 1);
if (state == rsl_encoding) {
tmp = rsl_strdup(r, encoding_frag,
encoding_pos, encoding_len);
/* XXX: this could be done at config time I'm sure... but I'm
* confused by all this magic_rsl stuff. -djg */
ap_str_tolower(tmp);
r->content_encoding = tmp;
}
/* detect memory allocation or other errors */
if (!r->content_type ||
(state == rsl_encoding && !r->content_encoding)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01511)
MODNAME ": unexpected state %d; could be caused by bad "
"data in magic file",
state);
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 int magic_process(request_rec *r)
{
apr_file_t *fd = NULL;
unsigned char buf[HOWMANY + 1]; /* one extra for terminating '\0' */
apr_size_t nbytes = 0; /* number of bytes read from a datafile */
int result;
/*
* first try judging the file based on its filesystem status
*/
switch ((result = fsmagic(r, r->filename))) {
case DONE:
magic_rsl_putchar(r, '\n');
return OK;
case OK:
break;
default:
/* fatal error, bail out */
return result;
}
if (apr_file_open(&fd, r->filename, APR_READ, APR_OS_DEFAULT, r->pool) != APR_SUCCESS) {
/* We can't open it, but we were able to stat it. */
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01512)
MODNAME ": can't read `%s'", r->filename);
/* let some other handler decide what the problem is */
return DECLINED;
}
/*
* try looking at the first HOWMANY bytes
*/
nbytes = sizeof(buf) - 1;
if ((result = apr_file_read(fd, (char *) buf, &nbytes)) != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, result, r, APLOGNO(01513)
MODNAME ": read failed: %s", r->filename);
return HTTP_INTERNAL_SERVER_ERROR;
}
if (nbytes == 0) {
return DECLINED;
}
else {
buf[nbytes++] = '\0'; /* null-terminate it */
result = tryit(r, buf, nbytes, 1);
if (result != OK) {
return result;
}
}
(void) apr_file_close(fd);
(void) magic_rsl_putchar(r, '\n');
return OK;
}
static int tryit(request_rec *r, unsigned char *buf, apr_size_t nb,
int checkzmagic)
{
/*
* Try compression stuff
*/
if (checkzmagic == 1) {
if (zmagic(r, buf, nb) == 1)
return OK;
}
/*
* try tests in /etc/magic (or surrogate magic file)
*/
if (softmagic(r, buf, nb) == 1)
return OK;
/*
* try known keywords, check for ascii-ness too.
*/
if (ascmagic(r, buf, nb) == 1)
return OK;
/*
* abandon hope, all ye who remain here
*/
return DECLINED;
}
#define EATAB {while (apr_isspace(*l)) ++l;}
/*
* apprentice - load configuration from the magic file r
* API request record
*/
static int apprentice(server_rec *s, apr_pool_t *p)
{
apr_file_t *f = NULL;
apr_status_t result;
char line[BUFSIZ + 1];
int errs = 0;
int lineno;
#if MIME_MAGIC_DEBUG
int rule = 0;
struct magic *m, *prevm;
#endif
magic_server_config_rec *conf = (magic_server_config_rec *)
ap_get_module_config(s->module_config, &mime_magic_module);
const char *fname = ap_server_root_relative(p, conf->magicfile);
if (!fname) {
ap_log_error(APLOG_MARK, APLOG_ERR, APR_EBADPATH, s, APLOGNO(01514)
MODNAME ": Invalid magic file path %s", conf->magicfile);
return -1;
}
if ((result = apr_file_open(&f, fname, APR_READ | APR_BUFFERED,
APR_OS_DEFAULT, p)) != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, result, s, APLOGNO(01515)
MODNAME ": can't read magic file %s", fname);
return -1;
}
/* set up the magic list (empty) */
conf->magic = conf->last = NULL;
/* parse it */
for (lineno = 1; apr_file_gets(line, BUFSIZ, f) == APR_SUCCESS; lineno++) {
int ws_offset;
char *last = line + strlen(line) - 1; /* guaranteed that len >= 1 since an
* "empty" line contains a '\n'
*/
/* delete newline and any other trailing whitespace */
while (last >= line
&& apr_isspace(*last)) {
*last = '\0';
--last;
}
/* skip leading whitespace */
ws_offset = 0;
while (line[ws_offset] && apr_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) apr_file_close(f);
#if MIME_MAGIC_DEBUG
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01516)
MODNAME ": apprentice conf=%pp file=%s m=%s m->next=%s last=%s",
conf,
conf->magicfile ? conf->magicfile : "NULL",
conf->magic ? "set" : "NULL",
(conf->magic && conf->magic->next) ? "set" : "NULL",
conf->last ? "set" : "NULL");
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01517)
MODNAME ": apprentice read %d lines, %d rules, %d errors",
lineno, rule, errs);
#endif
#if MIME_MAGIC_DEBUG
prevm = 0;
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01518)
MODNAME ": apprentice test");