1 /*
   2  * Copyright (c) 2014, 2017, 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 "logging/logStream.hpp"
  31 #include "memory/allocation.inline.hpp"
  32 #include "memory/metaspaceShared.hpp"
  33 #include "memory/resourceArea.hpp"
  34 #include "runtime/arguments.hpp"
  35 #include "utilities/ostream.hpp"
  36 
  37 void SharedPathsMiscInfo::add_path(const char* path, int type) {
  38   log_info(class, path)("type=%s ", type_name(type));
  39   ClassLoader::trace_class_path("add misc shared path ", path);
  40   write(path, strlen(path) + 1);
  41   write_jint(jint(type));
  42 }
  43 
  44 void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
  45   assert(_allocated, "cannot modify buffer during validation.");
  46   int used = get_used_bytes();
  47   int target = used + int(needed_bytes);
  48   if (target > _buf_size) {
  49     _buf_size = _buf_size * 2 + (int)needed_bytes;
  50     _buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
  51     _cur_ptr = _buf_start + used;
  52     _end_ptr = _buf_start + _buf_size;
  53   }
  54 }
  55 
  56 void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
  57   ensure_size(size);
  58   memcpy(_cur_ptr, ptr, size);
  59   _cur_ptr += size;
  60 }
  61 
  62 bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
  63   if (_cur_ptr + size <= _end_ptr) {
  64     memcpy(ptr, _cur_ptr, size);
  65     _cur_ptr += size;
  66     return true;
  67   }
  68   return false;
  69 }
  70 
  71 bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
  72   ClassLoader::trace_class_path(msg, name);
  73   MetaspaceShared::set_archive_loading_failed();
  74   return false;
  75 }
  76 
  77 void SharedPathsMiscInfo::print_path(int type, const char* path) {
  78   ResourceMark rm;
  79   LogStream ls(Log(class, path)::info());
  80   outputStream* out = &ls;
  81   switch (type) {
  82   case BOOT:
  83     out->print("Expecting BOOT path=%s", path);
  84     break;
  85   case NON_EXIST:
  86     out->print("Expecting that %s does not exist", path);
  87     break;
  88   default:
  89     ShouldNotReachHere();
  90   }
  91 }
  92 
  93 bool SharedPathsMiscInfo::check() {
  94   // The whole buffer must be 0 terminated so that we can use strlen and strcmp
  95   // without fear.
  96   _end_ptr -= sizeof(jint);
  97   if (_cur_ptr >= _end_ptr) {
  98     return fail("Truncated archive file header");
  99   }
 100   if (*_end_ptr != 0) {
 101     return fail("Corrupted archive file header");
 102   }
 103 
 104   while (_cur_ptr < _end_ptr) {
 105     jint type;
 106     const char* path = _cur_ptr;
 107     _cur_ptr += strlen(path) + 1;
 108     if (!read_jint(&type)) {
 109       return fail("Corrupted archive file header");
 110     }
 111     log_info(class, path)("type=%s ", type_name(type));
 112     print_path(type, path);
 113     if (!check(type, path)) {
 114       if (!PrintSharedArchiveAndExit) {
 115         return false;
 116       }
 117     } else {
 118       ClassLoader::trace_class_path("ok");
 119     }
 120   }
 121 
 122   return true;
 123 }
 124 
 125 bool SharedPathsMiscInfo::check(jint type, const char* path) {
 126   switch (type) {
 127   case BOOT:
 128     if (os::file_name_strcmp(path, Arguments::get_sysclasspath()) != 0) {
 129       return fail("[BOOT classpath mismatch, actual =", Arguments::get_sysclasspath());
 130     }
 131     break;
 132   case NON_EXIST:
 133     {
 134       struct stat st;
 135       if (os::stat(path, &st) == 0) {
 136         // The file actually exists
 137         // But we want it to not exist -> fail
 138         return fail("File must not exist");
 139       }
 140     }
 141     break;
 142   default:
 143     return fail("Corrupted archive file header");
 144   }
 145 
 146   return true;
 147 }