1 /*
   2  * Copyright (c) 2014, 2015, 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 "memory/allocation.inline.hpp"
  30 #include "memory/metaspaceShared.hpp"
  31 #include "runtime/arguments.hpp"

  32 
  33 void SharedPathsMiscInfo::add_path(const char* path, int type) {
  34   if (TraceClassPaths) {
  35     tty->print("[type=%s] ", type_name(type));
  36     trace_class_path("[Add misc shared path ", path);


  37   }
  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(tty, 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     if (TraceClassPaths) {
  94       tty->print("[type=%s ", type_name(type));
  95       print_path(tty, type, path);
  96       tty->print_cr("]");

  97     }
  98     if (!check(type, path)) {
  99       if (!PrintSharedArchiveAndExit) {
 100         return false;
 101       }
 102     } else {
 103       trace_class_path("[ok");
 104     }
 105   }
 106 
 107   return true;
 108 }
 109 
 110 bool SharedPathsMiscInfo::check(jint type, const char* path) {
 111   switch (type) {
 112   case BOOT:
 113     if (os::file_name_strcmp(path, Arguments::get_sysclasspath()) != 0) {
 114       return fail("[BOOT classpath mismatch, actual: -Dsun.boot.class.path=", Arguments::get_sysclasspath());
 115     }
 116     break;
 117   case NON_EXIST: // fall-through
 118   case REQUIRED:
 119     {
 120       struct stat st;
 121       if (os::stat(path, &st) != 0) {
 122         // The file does not actually exist
 123         if (type == REQUIRED) {
 124           // but we require it to exist -> fail
 125           return fail("Required file doesn't exist");
 126         }
 127       } else {
 128         // The file actually exists
 129         if (type == NON_EXIST) {
 130           // But we want it to not exist -> fail
 131           return fail("File must not exist");
 132         }
 133         time_t    timestamp;
 134         long      filesize;
 135 
 136         if (!read_time(&timestamp) || !read_long(&filesize)) {
 137           return fail("Corrupted archive file header");
 138         }
 139         if (timestamp != st.st_mtime) {
 140           return fail("Timestamp mismatch");
 141         }
 142         if (filesize != st.st_size) {
 143           return fail("File size mismatch");
 144         }
 145       }
 146     }
 147     break;
 148 
 149   default:
 150     return fail("Corrupted archive file header");
 151   }
 152 
 153   return true;
 154 }
--- EOF ---