+++ /dev/null
-/* 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; /* 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 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 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 {
- 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;
- unsigned suf_recursion; /* recursion depth in suffix check */
-} 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, 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,
- 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, 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, 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,
- 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 *)
- 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,
- 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,
- 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 */
- if (state == rsl_subtype || state == rsl_encoding ||
- state == rsl_encoding) {
- char *tmp;
- 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(r, tmp);
- }
- if (state == rsl_encoding) {
- char *tmp;
- 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,
- 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,
- 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,
- 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,
- 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,
- 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,
- MODNAME ": apprentice conf=%x 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,
- 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,
- MODNAME ": apprentice test");
- for (m = conf->magic; m; m = m->next) {
- if (apr_isprint((((unsigned long) m) >> 24) & 255) &&
- apr_isprint((((unsigned long) m) >> 16) & 255) &&
- apr_isprint((((unsigned long) m) >> 8) & 255) &&
- apr_isprint(((unsigned long) m) & 255)) {
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
- MODNAME ": apprentice: POINTER CLOBBERED! "
- "m=\"%c%c%c%c\" line=%d",
- (((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:
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
- MODNAME ": can't happen: m->type=%d", m->type);
- return -1;
- }
- return v;
-}
-
-/*
- * parse one line from magic file, put into magic[index++] if valid
- */
-static int parse(server_rec *serv, apr_pool_t *p, char *l, int lineno)
-{
- struct magic *m;
- char *t, *s;
- magic_server_config_rec *conf = (magic_server_config_rec *)
- ap_get_module_config(serv->module_config, &mime_magic_module);
-
- /* allocate magic structure entry */
- m = (struct magic *) apr_pcalloc(p, sizeof(struct magic));
-
- /* 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) {
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, serv,
- MODNAME ": offset %s invalid", 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:
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, serv,
- MODNAME ": indirect offset type %c invalid", *l);
- break;
- }
- l++;
- }
- s = l;
- if (*l == '+' || *l == '-')
- l++;
- if (apr_isdigit((unsigned char) *l)) {
- m->in.offset = strtol(l, &t, 0);
- if (*s == '-')
- m->in.offset = -m->in.offset;
- }
- else
- t = l;
- if (*t++ != ')') {
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, serv,
- MODNAME ": missing ')' in indirect offset");
- }
- l = t;
- }
-
-
- while (apr_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 {
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, serv,
- MODNAME ": type %s invalid", 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' && apr_isspace(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;
- strncpy(m->desc, l, sizeof(m->desc) - 1);
- m->desc[sizeof(m->desc) - 1] = '\0';
-
-#if MIME_MAGIC_DEBUG
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, serv,
- MODNAME ": parse line=%d m=%x next=%x cont=%d desc=%s",
- lineno, m, m->next, m->cont_level, m->desc);
-#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 (apr_isspace(c))
- break;
- if (p >= pmax) {
- ap_log_error(APLOG_MARK, APLOG_ERR, 0, serv,
- MODNAME ": 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(int c)
-{
- if (apr_isdigit(c))
- return c - '0';
- if ((c >= 'a') && (c <= 'f'))
- return c + 10 - 'a';
- if ((c >= 'A') && (c <= 'F'))
- return c + 10 - 'A';
- return -1;
-}
-
-
-/*
- * return DONE to indicate it's been handled
- * return OK to indicate it's a regular file still needing handling
- * other returns indicate a failure of some sort
- */
-static int fsmagic(request_rec *r, const char *fn)
-{
- switch (r->finfo.filetype) {
- case APR_DIR:
- magic_rsl_puts(r, DIR_MAGIC_TYPE);
- return DONE;
- case APR_CHR:
- /*
- * (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 DONE;
- case APR_BLK:
- /*
- * (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 DONE;
- /* TODO add code to handle V7 MUX and Blit MUX files */
- case APR_PIPE:
- /*
- * magic_rsl_puts(r,"fifo (named pipe)");
- */
- (void) magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
- return DONE;
- case APR_LNK:
- /* We used stat(), the only possible reason for this is that the
- * symlink is broken.
- */
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": broken symlink (%s)", fn);
- return HTTP_INTERNAL_SERVER_ERROR;
- case APR_SOCK:
- magic_rsl_puts(r, MIME_BINARY_UNKNOWN);
- return DONE;
- case APR_REG:
- break;
- default:
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": invalid file type %d.", r->finfo.filetype);
- return HTTP_INTERNAL_SERVER_ERROR;
- }
-
- /*
- * regular file, check next possibility
- */
- if (r->finfo.size == 0) {
- magic_rsl_puts(r, MIME_TEXT_UNKNOWN);
- return DONE;
- }
- return OK;
-}
-
-/*
- * 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, apr_size_t 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, apr_size_t 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 *)
- ap_get_module_config(r->server->module_config, &mime_magic_module);
- struct magic *m;
-
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": match conf=%x 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");
-#endif
-
-#if MIME_MAGIC_DEBUG
- for (m = conf->magic; m; m = m->next) {
- if (apr_isprint((((unsigned long) m) >> 24) & 255) &&
- apr_isprint((((unsigned long) m) >> 16) & 255) &&
- apr_isprint((((unsigned long) m) >> 8) & 255) &&
- apr_isprint(((unsigned long) m) & 255)) {
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": match: POINTER CLOBBERED! "
- "m=\"%c%c%c%c\"",
- (((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++;
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": line=%d desc=%s", 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++;
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": line=%d mc=%x mc->next=%x cont=%d desc=%s",
- m_cont->lineno, m_cont,
- m_cont->next, m_cont->cont_level,
- m_cont->desc);
-#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
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": rule matched, line=%d type=%d %s",
- 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
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": match line=%d cont=%d type=%d %s",
- 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
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": matched after %d rules", rule_counter);
-#endif
- return 1; /* all through */
- }
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": failed after %d rules", rule_counter);
-#endif
- return 0; /* no match at all */
-}
-
-static void mprint(request_rec *r, union VALUETYPE *p, struct magic *m)
-{
- char *pp;
- unsigned long v;
- char time_str[APR_CTIME_LEN];
-
- 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:
- apr_ctime(time_str, apr_time_from_sec(*(time_t *)&p->l));
- pp = time_str;
- (void) magic_rsl_printf(r, m->desc, pp);
- return;
- default:
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": invalid m->type (%d) in mprint().",
- 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:
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": invalid type %d in mconvert().", m->type);
- return 0;
- }
-}
-
-
-static int mget(request_rec *r, union VALUETYPE *p, unsigned char *s,
- struct magic *m, apr_size_t 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')) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": 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:
- /* bogosity, pretend that it just wasn't a match */
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": invalid type %d in mcheck().", m->type);
- return 0;
- }
-
- v = signextend(r->server, m, v) & m->mask;
-
- switch (m->reln) {
- case 'x':
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%lu == *any* = 1", v);
-#endif
- matched = 1;
- break;
-
- case '!':
- matched = v != l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%lu != %lu = %d", v, l, matched);
-#endif
- break;
-
- case '=':
- matched = v == l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%lu == %lu = %d", v, l, matched);
-#endif
- break;
-
- case '>':
- if (m->flag & UNSIGNED) {
- matched = v > l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%lu > %lu = %d", v, l, matched);
-#endif
- }
- else {
- matched = (long) v > (long) l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%ld > %ld = %d", v, l, matched);
-#endif
- }
- break;
-
- case '<':
- if (m->flag & UNSIGNED) {
- matched = v < l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%lu < %lu = %d", v, l, matched);
-#endif
- }
- else {
- matched = (long) v < (long) l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "%ld < %ld = %d", v, l, matched);
-#endif
- }
- break;
-
- case '&':
- matched = (v & l) == l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "((%lx & %lx) == %lx) = %d", v, l, l, matched);
-#endif
- break;
-
- case '^':
- matched = (v & l) != l;
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "((%lx & %lx) != %lx) = %d", v, l, l, matched);
-#endif
- break;
-
- default:
- /* bogosity, pretend it didn't match */
- matched = 0;
- ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- MODNAME ": mcheck: can't happen: invalid relation %d.",
- m->reln);
- break;
- }
-
- 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, apr_size_t nbytes)
-{
- int has_escapes = 0;
- unsigned char *s;
- char nbuf[HOWMANY + 1]; /* one extra for terminating '\0' */
- char *token;
- register struct names *p;
- int small_nbytes;
- char *strtok_state;
-
- /* 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 (apr_isspace(*tp))
- ++tp; /* skip leading whitespace */
- if ((apr_isalnum(*tp) || *tp == '\\') &&
- (apr_isalnum(*(tp + 1)) || *tp == '"')) {
- magic_rsl_puts(r, "application/x-troff");
- return 1;
- }
- }
- if ((*buf == 'c' || *buf == 'C') && apr_isspace(*(buf + 1))) {
- /* Fortran */
- magic_rsl_puts(r, "text/plain");
- return 1;
- }
-
- /* look for tokens from names.h - this is expensive!, so we'll limit
- * ourselves to only SMALL_HOWMANY bytes */
- small_nbytes = (nbytes > SMALL_HOWMANY) ? SMALL_HOWMANY : nbytes;
- /* make a copy of the buffer here because apr_strtok() will destroy it */
- s = (unsigned char *) memcpy(nbuf, buf, small_nbytes);
- s[small_nbytes] = '\0';
- has_escapes = (memchr(s, '\033', small_nbytes) != NULL);
- while ((token = apr_strtok((char *) s, " \t\n\r\f", &strtok_state)) != NULL) {
- s = NULL; /* make apr_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;
- }
-
- /* all else fails, but it is ascii... */
- return 0;
-}
-
-
-/*
- * 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;
- apr_size_t maglen;
- char *argv[3];
- int silent;
- char *encoding; /* MUST be lowercase */
-} compr[] = {
-
- /* we use gzip here rather than uncompress because we have to pass
- * it a full filename -- and uncompress only considers filenames
- * ending with .Z
- */
- {
- "\037\235", 2, {
- "gzip", "-dcq", NULL
- }, 0, "x-compress"
- },
- {
- "\037\213", 2, {
- "gzip", "-dcq", 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", "-dcq", NULL
- }, 0, "x-gzip"
- },
-};
-
-static int ncompr = sizeof(compr) / sizeof(compr[0]);
-
-static int zmagic(request_rec *r, unsigned char *buf, apr_size_t 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, &newbuf, nbytes)) > 0) {
- if (tryit(r, newbuf, newsize, 0) != OK) {
- return 0;
- }
-
- /* set encoding type in the request record */
- r->content_encoding = compr[i].encoding;
- }
- return 1;
-}
-
-
-struct uncompress_parms {
- request_rec *r;
- int method;
-};
-
-static int create_uncompress_child(struct uncompress_parms *parm, apr_pool_t *cntxt,
- apr_file_t **pipe_in)
-{
- int rc = 1;
- const char *new_argv[4];
- const char *const *env;
- request_rec *r = parm->r;
- apr_pool_t *child_context = cntxt;
- apr_procattr_t *procattr;
- apr_proc_t *procnew;
-
- /* XXX missing 1.3 logic:
- *
- * what happens when !compr[parm->method].silent?
- * Should we create the err pipe, read it, and copy to the log?
- */
-
- env = (const char *const *)ap_create_environment(child_context, r->subprocess_env);
-
- if ((apr_procattr_create(&procattr, child_context) != APR_SUCCESS) ||
- (apr_procattr_io_set(procattr, APR_FULL_BLOCK,
- APR_FULL_BLOCK, APR_NO_PIPE) != APR_SUCCESS) ||
- (apr_procattr_dir_set(procattr, r->filename) != APR_SUCCESS) ||
- (apr_procattr_cmdtype_set(procattr, APR_PROGRAM) != APR_SUCCESS)) {
- /* Something bad happened, tell the world. */
- ap_log_rerror(APLOG_MARK, APLOG_ERR, APR_ENOPROC, r,
- "couldn't setup child process: %s", r->filename);
- }
- else {
- new_argv[0] = compr[parm->method].argv[0];
- new_argv[1] = compr[parm->method].argv[1];
- new_argv[2] = r->filename;
- new_argv[3] = NULL;
-
- procnew = apr_pcalloc(child_context, sizeof(*procnew));
- rc = apr_proc_create(procnew, compr[parm->method].argv[0],
- new_argv, env, procattr, child_context);
-
- if (rc != APR_SUCCESS) {
- /* Bad things happened. Everyone should have cleaned up. */
- ap_log_rerror(APLOG_MARK, APLOG_ERR, APR_ENOPROC, r,
- MODNAME ": could not execute `%s'.",
- compr[parm->method].argv[0]);
- }
- else {
- apr_pool_note_subprocess(child_context, procnew, APR_KILL_AFTER_TIMEOUT);
- *pipe_in = procnew->out;
- }
- }
-
- return (rc);
-}
-
-static int uncompress(request_rec *r, int method,
- unsigned char **newch, apr_size_t n)
-{
- struct uncompress_parms parm;
- apr_file_t *pipe_out = NULL;
- apr_pool_t *sub_context;
- apr_status_t rv;
-
- parm.r = r;
- parm.method = method;
-
- /* We make a sub_pool so that we can collect our child early, otherwise
- * there are cases (i.e. generating directory indicies with mod_autoindex)
- * where we would end up with LOTS of zombies.
- */
- if (apr_pool_create(&sub_context, r->pool) != APR_SUCCESS)
- return -1;
-
- if ((rv = create_uncompress_child(&parm, sub_context, &pipe_out)) != APR_SUCCESS) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
- MODNAME ": couldn't spawn uncompress process: %s", r->uri);
- return -1;
- }
-
- *newch = (unsigned char *) apr_palloc(r->pool, n);
- rv = apr_file_read(pipe_out, *newch, &n);
- if (n == 0) {
- apr_pool_destroy(sub_context);
- ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
- MODNAME ": read failed %s", r->filename);
- return -1;
- }
- apr_pool_destroy(sub_context);
- 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) (((unsigned char)(c) >= '0') && ((unsigned char)(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(unsigned char *buf, apr_size_t 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 (apr_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 && !apr_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
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": revision_suffix checking %s", r->filename);
-#endif /* MIME_MAGIC_DEBUG */
-
- /* check for recognized revision suffix */
- suffix_pos = strlen(r->filename) - 1;
- if (!apr_isdigit(r->filename[suffix_pos])) {
- return 0;
- }
- while (suffix_pos >= 0 && apr_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 = apr_pstrndup(r->pool, r->filename, suffix_pos);
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": subrequest lookup for %s", sub_filename);
-#endif /* MIME_MAGIC_DEBUG */
- sub = ap_sub_req_lookup_file(sub_filename, r, NULL);
-
- /* extract content type/encoding/language from sub-request */
- if (sub->content_type) {
- ap_set_content_type(r, apr_pstrdup(r->pool, sub->content_type));
-#if MIME_MAGIC_DEBUG
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- MODNAME ": subrequest %s got %s",
- sub_filename, r->content_type);
-#endif /* MIME_MAGIC_DEBUG */
- if (sub->content_encoding)
- r->content_encoding =
- apr_pstrdup(r->pool, sub->content_encoding);
- if (sub->content_languages) {
- int n;
- r->content_languages = apr_array_copy(r->pool,
- sub->content_languages);
- for (n = 0; n < r->content_languages->nelts; ++n) {
- char **lang = ((char **)r->content_languages->elts) + n;
- *lang = apr_pstrdup(r->pool, *lang);
- }
- }
- result = 1;
- }
-
- /* clean up */
- ap_destroy_sub_req(sub);
-
- return result;
-}
-
-/*
- * initialize the module
- */
-static int magic_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *main_server)
-{
- int result;
- magic_server_config_rec *conf;
- magic_server_config_rec *main_conf;
- server_rec *s;
-#if MIME_MAGIC_DEBUG
- struct magic *m, *prevm;
-#endif /* MIME_MAGIC_DEBUG */
-
- main_conf = ap_get_module_config(main_server->module_config, &mime_magic_module);
- for (s = main_server; s; s = s->next) {
- conf = ap_get_module_config(s->module_config, &mime_magic_module);
- if (conf->magicfile == NULL && s != main_server) {
- /* inherits from the parent */
- *conf = *main_conf;
- }
- else if (conf->magicfile) {
- result = apprentice(s, p);
- if (result == -1)
- return OK;
-#if MIME_MAGIC_DEBUG
- prevm = 0;
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
- MODNAME ": magic_init 1 test");
- for (m = conf->magic; m; m = m->next) {
- if (apr_isprint((((unsigned long) m) >> 24) & 255) &&
- apr_isprint((((unsigned long) m) >> 16) & 255) &&
- apr_isprint((((unsigned long) m) >> 8) & 255) &&
- apr_isprint(((unsigned long) m) & 255)) {
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
- MODNAME ": magic_init 1: POINTER CLOBBERED! "
- "m=\"%c%c%c%c\" line=%d",
- (((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 OK;
-}
-
-/*
- * Find the Content-Type from any resource this module has available
- */
-
-static int magic_find_ct(request_rec *r)
-{
- int result;
- magic_server_config_rec *conf;
-
- /* the file has to exist */
- if (r->finfo.filetype == 0 || !r->filename) {
- return DECLINED;
- }
-
- /* was someone else already here? */
- if (r->content_type) {
- return DECLINED;
- }
-
- conf = ap_get_module_config(r->server->module_config, &mime_magic_module);
- if (!conf || !conf->magic) {
- return DECLINED;
- }
-
- /* 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 */
- if ((result = magic_process(r)) != OK) {
- return result;
- }
- }
-
- /* if we have any results, put them in the request structure */
- return magic_rsl_to_request(r);
-}
-
-static void register_hooks(apr_pool_t *p)
-{
- static const char * const aszPre[]={ "mod_mime.c", NULL };
-
- /* mod_mime_magic should be run after mod_mime, if at all. */
-
- ap_hook_type_checker(magic_find_ct, aszPre, NULL, APR_HOOK_MIDDLE);
- ap_hook_post_config(magic_init, NULL, NULL, APR_HOOK_FIRST);
-}
-
-/*
- * Apache API module interface
- */
-
-module AP_MODULE_DECLARE_DATA mime_magic_module =
-{
- STANDARD20_MODULE_STUFF,
- 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 apr_table_t */
- register_hooks /* register hooks */
-};
-
-
Code Review / bottlenecks.git / blobdiff