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
|
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "courgette/disassembler.h"
#include <algorithm>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/logging.h"
#include "courgette/assembly_program.h"
#include "courgette/courgette.h"
#include "courgette/disassembler_elf_32_arm.h"
#include "courgette/disassembler_elf_32_x86.h"
#include "courgette/disassembler_win32_x86.h"
#include "courgette/encoded_program.h"
// COURGETTE_HISTOGRAM_TARGETS prints out a histogram of how frequently
// different target addresses are referenced. Purely for debugging.
#define COURGETTE_HISTOGRAM_TARGETS 0
namespace courgette {
////////////////////////////////////////////////////////////////////////////////
Disassembler* DetectDisassembler(const void* buffer, size_t length) {
Disassembler* disassembler = NULL;
disassembler = new DisassemblerWin32X86(buffer, length);
if (disassembler->ParseHeader())
return disassembler;
else
delete disassembler;
disassembler = new DisassemblerElf32X86(buffer, length);
if (disassembler->ParseHeader())
return disassembler;
else
delete disassembler;
disassembler = new DisassemblerElf32ARM(buffer, length);
if (disassembler->ParseHeader())
return disassembler;
else
delete disassembler;
return NULL;
}
Status DetectExecutableType(const void* buffer, size_t length,
ExecutableType* type,
size_t* detected_length) {
Disassembler* disassembler = DetectDisassembler(buffer, length);
if (disassembler) {
*type = disassembler->kind();
*detected_length = disassembler->length();
delete disassembler;
return C_OK;
}
// We failed to detect anything
*type = EXE_UNKNOWN;
*detected_length = 0;
return C_INPUT_NOT_RECOGNIZED;
}
Status ParseDetectedExecutable(const void* buffer, size_t length,
AssemblyProgram** output) {
*output = NULL;
Disassembler* disassembler = DetectDisassembler(buffer, length);
if (!disassembler) {
return C_INPUT_NOT_RECOGNIZED;
}
AssemblyProgram* program = new AssemblyProgram(disassembler->kind());
if (!disassembler->Disassemble(program)) {
delete program;
delete disassembler;
return C_DISASSEMBLY_FAILED;
}
delete disassembler;
*output = program;
return C_OK;
}
void DeleteAssemblyProgram(AssemblyProgram* program) {
delete program;
}
Disassembler::Disassembler(const void* start, size_t length)
: failure_reason_("uninitialized") {
start_ = reinterpret_cast<const uint8*>(start);
length_ = length;
end_ = start_ + length_;
};
Disassembler::~Disassembler() {};
const uint8* Disassembler::OffsetToPointer(size_t offset) const {
assert(start_ + offset <= end_);
return start_ + offset;
}
bool Disassembler::Good() {
failure_reason_ = NULL;
return true;
}
bool Disassembler::Bad(const char* reason) {
failure_reason_ = reason;
return false;
}
void Disassembler::ReduceLength(size_t reduced_length) {
if (reduced_length < length_)
length_ = reduced_length;
}
} // namespace courgette
|
