1251881Speter/* 2251881Speter * magic.c: wrappers around libmagic 3251881Speter * 4251881Speter * ==================================================================== 5251881Speter * Licensed to the Apache Software Foundation (ASF) under one 6251881Speter * or more contributor license agreements. See the NOTICE file 7251881Speter * distributed with this work for additional information 8251881Speter * regarding copyright ownership. The ASF licenses this file 9251881Speter * to you under the Apache License, Version 2.0 (the 10251881Speter * "License"); you may not use this file except in compliance 11251881Speter * with the License. You may obtain a copy of the License at 12251881Speter * 13251881Speter * http://www.apache.org/licenses/LICENSE-2.0 14251881Speter * 15251881Speter * Unless required by applicable law or agreed to in writing, 16251881Speter * software distributed under the License is distributed on an 17251881Speter * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 18251881Speter * KIND, either express or implied. See the License for the 19251881Speter * specific language governing permissions and limitations 20251881Speter * under the License. 21251881Speter * ==================================================================== 22251881Speter */ 23251881Speter 24251881Speter/* ==================================================================== */ 25251881Speter 26251881Speter 27251881Speter/*** Includes. ***/ 28251881Speter 29251881Speter#include <apr_lib.h> 30251881Speter#include <apr_file_info.h> 31251881Speter 32251881Speter#include "svn_io.h" 33251881Speter#include "svn_types.h" 34251881Speter#include "svn_pools.h" 35251881Speter#include "svn_error.h" 36289180Speter#include "svn_config.h" 37289180Speter#include "svn_hash.h" 38251881Speter 39251881Speter#include "svn_private_config.h" 40251881Speter 41251881Speter#include "private/svn_magic.h" 42251881Speter 43251881Speter#ifdef SVN_HAVE_LIBMAGIC 44251881Speter#include <magic.h> 45251881Speter#endif 46251881Speter 47251881Speterstruct svn_magic__cookie_t { 48251881Speter#ifdef SVN_HAVE_LIBMAGIC 49251881Speter magic_t magic; 50251881Speter#else 51251881Speter char dummy; 52251881Speter#endif 53251881Speter}; 54251881Speter 55251881Speter#ifdef SVN_HAVE_LIBMAGIC 56251881Speter/* Close the magic database. */ 57251881Speterstatic apr_status_t 58251881Speterclose_magic_cookie(void *baton) 59251881Speter{ 60251881Speter svn_magic__cookie_t *mc = (svn_magic__cookie_t*)baton; 61251881Speter magic_close(mc->magic); 62251881Speter return APR_SUCCESS; 63251881Speter} 64251881Speter#endif 65251881Speter 66289180Spetersvn_error_t * 67251881Spetersvn_magic__init(svn_magic__cookie_t **magic_cookie, 68289180Speter apr_hash_t *config, 69251881Speter apr_pool_t *result_pool) 70251881Speter{ 71251881Speter svn_magic__cookie_t *mc = NULL; 72251881Speter 73251881Speter#ifdef SVN_HAVE_LIBMAGIC 74289180Speter if (config) 75289180Speter { 76289180Speter svn_boolean_t enable; 77289180Speter svn_config_t *cfg = svn_hash_gets(config, SVN_CONFIG_CATEGORY_CONFIG); 78289180Speter 79289180Speter SVN_ERR(svn_config_get_bool(cfg, &enable, 80289180Speter SVN_CONFIG_SECTION_MISCELLANY, 81289180Speter SVN_CONFIG_OPTION_ENABLE_MAGIC_FILE, 82289180Speter TRUE)); 83289180Speter if (!enable) 84289180Speter { 85289180Speter *magic_cookie = NULL; 86289180Speter return SVN_NO_ERROR; 87289180Speter } 88289180Speter } 89289180Speter 90251881Speter mc = apr_palloc(result_pool, sizeof(*mc)); 91251881Speter 92251881Speter /* Initialise libmagic. */ 93251881Speter#ifndef MAGIC_MIME_TYPE 94251881Speter /* Some old versions of libmagic don't support MAGIC_MIME_TYPE. 95251881Speter * We can use MAGIC_MIME instead. It returns more than we need 96251881Speter * but we can work around that (see below). */ 97251881Speter mc->magic = magic_open(MAGIC_MIME | MAGIC_ERROR); 98251881Speter#else 99251881Speter mc->magic = magic_open(MAGIC_MIME_TYPE | MAGIC_ERROR); 100251881Speter#endif 101251881Speter if (mc->magic) 102251881Speter { 103251881Speter /* This loads the default magic database. 104251881Speter * Point the MAGIC environment variable at your favourite .mgc 105251881Speter * file to load a non-default database. */ 106251881Speter if (magic_load(mc->magic, NULL) == -1) 107251881Speter { 108251881Speter magic_close(mc->magic); 109251881Speter mc = NULL; 110251881Speter } 111251881Speter else 112251881Speter apr_pool_cleanup_register(result_pool, mc, close_magic_cookie, 113251881Speter apr_pool_cleanup_null); 114251881Speter } 115251881Speter#endif 116251881Speter 117251881Speter *magic_cookie = mc; 118289180Speter 119289180Speter return SVN_NO_ERROR; 120251881Speter} 121251881Speter 122251881Spetersvn_error_t * 123251881Spetersvn_magic__detect_binary_mimetype(const char **mimetype, 124251881Speter const char *local_abspath, 125251881Speter svn_magic__cookie_t *magic_cookie, 126251881Speter apr_pool_t *result_pool, 127251881Speter apr_pool_t *scratch_pool) 128251881Speter{ 129251881Speter const char *magic_mimetype = NULL; 130251881Speter#ifdef SVN_HAVE_LIBMAGIC 131251881Speter apr_finfo_t finfo; 132251881Speter 133251881Speter /* Do not ask libmagic for the mime-types of empty files. 134251881Speter * This prevents mime-types like "application/x-empty" from making 135251881Speter * Subversion treat empty files as binary. */ 136251881Speter SVN_ERR(svn_io_stat(&finfo, local_abspath, APR_FINFO_SIZE, scratch_pool)); 137251881Speter if (finfo.size > 0) 138251881Speter { 139251881Speter magic_mimetype = magic_file(magic_cookie->magic, local_abspath); 140251881Speter if (magic_mimetype) 141251881Speter { 142251881Speter /* Only return binary mime-types. */ 143251881Speter if (strncmp(magic_mimetype, "text/", 5) == 0) 144251881Speter magic_mimetype = NULL; 145251881Speter else 146251881Speter { 147251881Speter svn_error_t *err; 148251881Speter#ifndef MAGIC_MIME_TYPE 149251881Speter char *p; 150251881Speter 151251881Speter /* Strip off trailing stuff like " charset=ascii". */ 152251881Speter p = strchr(magic_mimetype, ' '); 153251881Speter if (p) 154251881Speter *p = '\0'; 155251881Speter#endif 156251881Speter /* Make sure we got a valid mime type. */ 157251881Speter err = svn_mime_type_validate(magic_mimetype, scratch_pool); 158251881Speter if (err) 159251881Speter { 160251881Speter if (err->apr_err == SVN_ERR_BAD_MIME_TYPE) 161251881Speter { 162251881Speter svn_error_clear(err); 163251881Speter magic_mimetype = NULL; 164251881Speter } 165251881Speter else 166251881Speter return svn_error_trace(err); 167251881Speter } 168251881Speter else 169251881Speter { 170251881Speter /* The string is allocated from memory managed by libmagic 171251881Speter * so we must copy it to the result pool. */ 172251881Speter magic_mimetype = apr_pstrdup(result_pool, magic_mimetype); 173251881Speter } 174251881Speter } 175251881Speter } 176251881Speter } 177251881Speter#endif 178251881Speter 179251881Speter *mimetype = magic_mimetype; 180251881Speter return SVN_NO_ERROR; 181251881Speter} 182