1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*******************************************************************************
* Copyright (c) 2000, 2012 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* QNX Software Systems - Initial API and implementation
* Anton Leherbauer (Wind River Systems)
* Hansruedi Patzen (IFS)
*******************************************************************************/
package org.eclipse.cdt.utils.elf.parser;
import static org.eclipse.cdt.internal.core.ByteUtils.makeShort;
import static org.eclipse.cdt.internal.core.ByteUtils.makeInt;
import java.io.EOFException;
import java.io.IOException;
import java.util.Arrays;
import org.eclipse.cdt.core.AbstractCExtension;
import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.IBinaryParser;
import org.eclipse.cdt.utils.AR;
import org.eclipse.cdt.utils.elf.Elf;
import org.eclipse.cdt.utils.elf.Elf.Attribute;
import org.eclipse.cdt.utils.elf.Elf.ELFhdr;
import org.eclipse.cdt.utils.elf.Elf.PHdr;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
/**
*/
public class ElfParser extends AbstractCExtension implements IBinaryParser {
/* (non-Javadoc)
* @see org.eclipse.cdt.core.IBinaryParser#getBinary(org.eclipse.core.runtime.IPath)
*/
@Override
public IBinaryFile getBinary(IPath path) throws IOException {
return getBinary(null, path);
}
@Override
public IBinaryFile getBinary(byte[] hints, IPath path) throws IOException {
if (path == null) {
throw new IOException(CCorePlugin.getResourceString("Util.exception.nullPath")); //$NON-NLS-1$
}
IBinaryFile binary = null;
if (hints != null && AR.isARHeader(hints)) {
binary = createBinaryArchive(path);
} else {
try {
Attribute attribute = getAttribute(hints, path);
if (attribute != null) {
switch (attribute.getType()) {
case Attribute.ELF_TYPE_EXE :
binary = createBinaryExecutable(path);
break;
case Attribute.ELF_TYPE_SHLIB :
binary = hasInterpProgramHeader(hints, path) ? createBinaryExecutable(path) : createBinaryShared(path);
break;
case Attribute.ELF_TYPE_OBJ :
binary = createBinaryObject(path);
break;
case Attribute.ELF_TYPE_CORE :
binary = createBinaryCore(path);
break;
}
if (binary instanceof ElfBinaryObject) {
((ElfBinaryObject)binary).setElfAttributes(attribute);
}
}
} catch (IOException e) {
if (hints == null) {
try {
binary = createBinaryArchive(path);
} catch (IOException e2) {
CCorePlugin.log(e); // log original exception
throw e2;
}
}
}
}
return binary;
}
/**
* @see org.eclipse.cdt.core.IBinaryParser#getFormat()
*/
@Override
public String getFormat() {
return "ELF"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.cdt.core.IBinaryParser#isBinary(byte[], org.eclipse.core.runtime.IPath)
*/
@Override
public boolean isBinary(byte[] array, IPath path) {
return Elf.isElfHeader(array) || AR.isARHeader(array);
}
/* (non-Javadoc)
* @see org.eclipse.cdt.core.IBinaryParser#getBufferSize()
*/
@Override
public int getHintBufferSize() {
return 128;
}
protected IBinaryArchive createBinaryArchive(IPath path) throws IOException {
return new ElfBinaryArchive(this, path);
}
protected IBinaryObject createBinaryObject(IPath path) throws IOException {
return new ElfBinaryObject(this, path, IBinaryFile.OBJECT);
}
protected IBinaryExecutable createBinaryExecutable(IPath path) throws IOException {
return new ElfBinaryExecutable(this, path);
}
protected IBinaryShared createBinaryShared(IPath path) throws IOException {
return new ElfBinaryShared(this, path);
}
protected IBinaryObject createBinaryCore(IPath path) throws IOException {
return new ElfBinaryObject(this, path, IBinaryFile.CORE);
}
private static Elf.Attribute getAttribute(byte[] hints, IPath path) throws IOException {
if (Elf.isElfHeader(hints)) {
try {
return Elf.getAttributes(hints);
} catch (EOFException eof) {
// continue, the array was to small.
}
}
return Elf.getAttributes(path.toOSString());
}
private static boolean hasInterpProgramHeader(byte[] hints, IPath path) throws IOException {
if (Elf.isElfHeader(hints)) {
int e_phentsizeOffset = 0;
int e_phnumOffset = 0;
int e_ehsizeOffset = 0;
switch (hints[ELFhdr.EI_CLASS]) {
case ELFhdr.ELFCLASS32:
e_ehsizeOffset = 0x28;
e_phentsizeOffset = 0x2A;
e_phnumOffset = 0x2C;
break;
case ELFhdr.ELFCLASS64:
e_ehsizeOffset = 0x34;
e_phentsizeOffset = 0x36;
e_phnumOffset = 0x38;
break;
default:
CCorePlugin.log(IStatus.WARNING, "Unknown ELF header class in file: " + path.toOSString()); //$NON-NLS-1$
return false;
}
if (e_phnumOffset + 2 < hints.length) {
boolean isle = (hints[ELFhdr.EI_DATA] == ELFhdr.ELFDATA2LSB);
short e_phentsize = makeShort(hints, e_phentsizeOffset, isle);
short e_phnum = makeShort(hints, e_phnumOffset, isle);
short e_ehsize = makeShort(hints, e_ehsizeOffset, isle);
int lastProgramHeaderOffset = e_ehsize + (e_phnum - 1) * e_phentsize;
for (int i = e_ehsize; i < Math.min(lastProgramHeaderOffset, hints.length) + 4; i += e_phentsize) {
if (makeInt(hints, i, isle) == PHdr.PT_INTERP) {
return true;
}
}
/* See if we checked every program header type */
if (lastProgramHeaderOffset + 4 < hints.length) {
return false;
}
}
}
try {
/* No PHdr.PT_INTERP found in the hints meaning we need to read the file itself */
return Arrays.stream(new Elf(path.toOSString()).getPHdrs()).anyMatch(phdr -> phdr.p_type == PHdr.PT_INTERP);
} catch (IOException e) {
CCorePlugin.log(e);
}
return false;
}
}
|
