1 /*
   2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/classLoader.hpp"
  27 #include "classfile/classLoaderData.inline.hpp"
  28 #include "classfile/sharedPathsMiscInfo.hpp"
  29 #include "logging/log.hpp"
  30 #include "memory/allocation.inline.hpp"
  31 #include "memory/metaspaceShared.hpp"
  32 #include "runtime/arguments.hpp"
  33 #include "utilities/ostream.hpp"
  34 
  35 void SharedPathsMiscInfo::add_path(const char* path, int type) {
  36   log_info(classpath)("type=%s ", type_name(type));
  37   ClassLoader::trace_class_path("add misc shared path ", path);


  38   write(path, strlen(path) + 1);
  39   write_jint(jint(type));
  40 }
  41 
  42 void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
  43   assert(_allocated, "cannot modify buffer during validation.");
  44   int used = get_used_bytes();
  45   int target = used + int(needed_bytes);
  46   if (target > _buf_size) {
  47     _buf_size = _buf_size * 2 + (int)needed_bytes;
  48     _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
  49     _cur_ptr = _buf_start + used;
  50     _end_ptr = _buf_start + _buf_size;
  51   }
  52 }
  53 
  54 void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
  55   ensure_size(size);
  56   memcpy(_cur_ptr, ptr, size);
  57   _cur_ptr += size;
  58 }
  59 
  60 bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
  61   if (_cur_ptr + size <= _end_ptr) {
  62     memcpy(ptr, _cur_ptr, size);
  63     _cur_ptr += size;
  64     return true;
  65   }
  66   return false;
  67 }
  68 
  69 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
  70   ClassLoader::trace_class_path(msg, name);
  71   MetaspaceShared::set_archive_loading_failed();
  72   return false;
  73 }
  74 
  75 bool SharedPathsMiscInfo::check() {
  76   // The whole buffer must be 0 terminated so that we can use strlen and strcmp
  77   // without fear.
  78   _end_ptr -= sizeof(jint);
  79   if (_cur_ptr >= _end_ptr) {
  80     return fail("Truncated archive file header");
  81   }
  82   if (*_end_ptr != 0) {
  83     return fail("Corrupted archive file header");
  84   }
  85 
  86   while (_cur_ptr < _end_ptr) {
  87     jint type;
  88     const char* path = _cur_ptr;
  89     _cur_ptr += strlen(path) + 1;
  90     if (!read_jint(&type)) {
  91       return fail("Corrupted archive file header");
  92     }
  93     log_info(classpath)("type=%s ", type_name(type));
  94     print_path(type, path);



  95     if (!check(type, path)) {
  96       if (!PrintSharedArchiveAndExit) {
  97         return false;
  98       }
  99     } else {
 100       ClassLoader::trace_class_path("ok");
 101     }
 102   }
 103 
 104   return true;
 105 }
 106 
 107 bool SharedPathsMiscInfo::check(jint type, const char* path) {
 108   switch (type) {
 109   case BOOT:
 110     if (os::file_name_strcmp(path, Arguments::get_sysclasspath()) != 0) {
 111       return fail("[BOOT classpath mismatch, actual: -Dsun.boot.class.path=", Arguments::get_sysclasspath());
 112     }
 113     break;
 114   case NON_EXIST: // fall-through
 115   case REQUIRED:
 116     {
 117       struct stat st;
 118       if (os::stat(path, &st) != 0) {
 119         // The file does not actually exist
 120         if (type == REQUIRED) {
 121           // but we require it to exist -> fail
 122           return fail("Required file doesn't exist");
 123         }
 124       } else {
 125         // The file actually exists
 126         if (type == NON_EXIST) {
 127           // But we want it to not exist -> fail
 128           return fail("File must not exist");
 129         }
 130         time_t    timestamp;
 131         long      filesize;
 132 
 133         if (!read_time(&timestamp) || !read_long(&filesize)) {
 134           return fail("Corrupted archive file header");
 135         }
 136         if (timestamp != st.st_mtime) {
 137           return fail("Timestamp mismatch");
 138         }
 139         if (filesize != st.st_size) {
 140           return fail("File size mismatch");
 141         }
 142       }
 143     }
 144     break;
 145 
 146   default:
 147     return fail("Corrupted archive file header");
 148   }
 149 
 150   return true;
 151 }
--- EOF ---