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
|
// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
#ifndef _LEVIN_BASE_H_
#define _LEVIN_BASE_H_
#include <cstdint>
#include "byte_stream.h"
#include "net_utils_base.h"
#include "span.h"
#define LEVIN_SIGNATURE 0x0101010101012101LL //Bender's nightmare
namespace epee
{
class byte_slice;
namespace levin
{
#pragma pack(push)
#pragma pack(1)
struct bucket_head
{
uint64_t m_signature;
uint64_t m_cb;
uint8_t m_have_to_return_data;
uint32_t m_command;
int32_t m_return_code;
uint32_t m_reservedA; //probably some flags in future
uint32_t m_reservedB; //probably some check sum in future
};
#pragma pack(pop)
#pragma pack(push)
#pragma pack(1)
struct bucket_head2
{
uint64_t m_signature;
uint64_t m_cb;
uint8_t m_have_to_return_data;
uint32_t m_command;
int32_t m_return_code;
uint32_t m_flags;
uint32_t m_protocol_version;
};
#pragma pack(pop)
#define LEVIN_DEFAULT_TIMEOUT_PRECONFIGURED 0
#define LEVIN_INITIAL_MAX_PACKET_SIZE 256*1024 // 256 KiB before handshake
#define LEVIN_DEFAULT_MAX_PACKET_SIZE 100000000 //100MB by default after handshake
#define LEVIN_PACKET_REQUEST 0x00000001
#define LEVIN_PACKET_RESPONSE 0x00000002
#define LEVIN_PACKET_BEGIN 0x00000004
#define LEVIN_PACKET_END 0x00000008
#define LEVIN_PROTOCOL_VER_0 0
#define LEVIN_PROTOCOL_VER_1 1
template<class t_connection_context = net_utils::connection_context_base>
struct levin_commands_handler
{
virtual int invoke(int command, const epee::span<const uint8_t> in_buff, byte_stream& buff_out, t_connection_context& context)=0;
virtual int notify(int command, const epee::span<const uint8_t> in_buff, t_connection_context& context)=0;
virtual void callback(t_connection_context& context){};
virtual void on_connection_new(t_connection_context& context){};
virtual void on_connection_close(t_connection_context& context){};
virtual ~levin_commands_handler(){}
};
#define LEVIN_OK 0
#define LEVIN_ERROR_CONNECTION -1
#define LEVIN_ERROR_CONNECTION_NOT_FOUND -2
#define LEVIN_ERROR_CONNECTION_DESTROYED -3
#define LEVIN_ERROR_CONNECTION_TIMEDOUT -4
#define LEVIN_ERROR_CONNECTION_NO_DUPLEX_PROTOCOL -5
#define LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED -6
#define LEVIN_ERROR_FORMAT -7
#define DESCRIBE_RET_CODE(code) case code: return #code;
inline
const char* get_err_descr(int err)
{
switch(err)
{
DESCRIBE_RET_CODE(LEVIN_OK);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_NOT_FOUND);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_DESTROYED);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_TIMEDOUT);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_NO_DUPLEX_PROTOCOL);
DESCRIBE_RET_CODE(LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED);
DESCRIBE_RET_CODE(LEVIN_ERROR_FORMAT);
default:
return "unknown code";
}
}
//! Provides space for levin (p2p) header, so that payload can be sent without copy
class message_writer
{
byte_slice finalize(uint32_t command, uint32_t flags, uint32_t return_code, bool expect_response);
public:
using header = bucket_head2;
explicit message_writer(std::size_t reserve = 8192);
message_writer(const message_writer&) = delete;
message_writer(message_writer&&) = default;
~message_writer() = default;
message_writer& operator=(const message_writer&) = delete;
message_writer& operator=(message_writer&&) = default;
//! \return Size of payload (excludes header size).
std::size_t payload_size() const noexcept
{
return buffer.size() < sizeof(header) ? 0 : buffer.size() - sizeof(header);
}
byte_slice finalize_invoke(uint32_t command) { return finalize(command, LEVIN_PACKET_REQUEST, 0, true); }
byte_slice finalize_notify(uint32_t command) { return finalize(command, LEVIN_PACKET_REQUEST, 0, false); }
byte_slice finalize_response(uint32_t command, uint32_t return_code)
{
return finalize(command, LEVIN_PACKET_RESPONSE, return_code, false);
}
//! Has space for levin header until a finalize method is used
byte_stream buffer;
};
//! \return Intialized levin header.
bucket_head2 make_header(uint32_t command, uint64_t msg_size, uint32_t flags, bool expect_response) noexcept;
/*! Generate a dummy levin message.
\param noise_bytes Total size of the returned `byte_slice`.
\return `nullptr` if `noise_size` is smaller than the levin header.
Otherwise, a dummy levin message. */
byte_slice make_noise_notify(std::size_t noise_bytes);
/*! Generate 1+ levin messages that are identical to the noise message size.
\param noise_size Each levin message will be identical to this value.
\return `nullptr` if `noise.size()` is less than the levin header size.
Otherwise, a levin notification message OR 2+ levin fragment messages.
Each message is `noise.size()` in length. */
byte_slice make_fragmented_notify(const std::size_t noise_size, int command, message_writer message);
}
}
#endif //_LEVIN_BASE_H_
|
