sharedPathsMiscInfo.cpp revision 6872:16286b7d7c6e 
1/*
2 * Copyright (c) 2014, 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
33void 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
42void 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
54void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
55  ensure_size(size);
56  memcpy(_cur_ptr, ptr, size);
57  _cur_ptr += size;
58}
59
60bool 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
69bool 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
75bool 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
110bool SharedPathsMiscInfo::check(jint type, const char* path) {
111  switch (type) {
112  case BOOT:
113    if (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}
155