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
|
// Copyright (c) 2014, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. 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.
//
// 3. Neither the name of the copyright holder 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 HOLDER OR CONTRIBUTORS 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.
//
// Parts of this file are originally copyright (c) 2006-2013, Andrey N. Sabelnikov
#ifndef _LEVIN_PROTOCOL_HANDLER_H_
#define _LEVIN_PROTOCOL_HANDLER_H_
#include <boost/uuid/uuid_generators.hpp>
#include "levin_base.h"
namespace epee
{
namespace levin
{
template<class t_connection_context = net_utils::connection_context_base>
struct protocl_handler_config
{
levin_commands_handler<t_connection_context>* m_pcommands_handler;
};
template<class t_connection_context = net_utils::connection_context_base>
class protocol_handler
{
public:
typedef t_connection_context connection_context;
typedef protocl_handler_config<t_connection_context> config_type;
protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context);
virtual ~protocol_handler(){}
virtual bool handle_recv(const void* ptr, size_t cb);
bool after_init_connection(){return true;}
private:
enum connection_data_state
{
conn_state_reading_head,
conn_state_reading_body
};
config_type& m_config;
t_connection_context& m_conn_context;
net_utils::i_service_endpoint* m_psnd_hndlr;
std::string m_cach_in_buffer;
connection_data_state m_state;
bucket_head m_current_head;
};
template<class t_connection_context>
protocol_handler<t_connection_context>::protocol_handler(net_utils::i_service_endpoint* psnd_hndlr, config_type& config, t_connection_context& conn_context):
m_config(config),
m_conn_context(conn_context),
m_psnd_hndlr(psnd_hndlr),
m_state(conn_state_reading_head),
m_current_head(bucket_head())
{}
template<class t_connection_context>
bool protocol_handler<t_connection_context>::handle_recv(const void* ptr, size_t cb)
{
if(!m_config.m_pcommands_handler)
{
LOG_ERROR("Command handler not set!");
return false;
}
m_cach_in_buffer.append((const char*)ptr, cb);
bool is_continue = true;
while(is_continue)
{
switch(m_state)
{
case conn_state_reading_head:
if(m_cach_in_buffer.size() < sizeof(bucket_head))
{
if(m_cach_in_buffer.size() >= sizeof(uint64_t) && *((uint64_t*)m_cach_in_buffer.data()) != LEVIN_SIGNATURE)
{
LOG_ERROR("Signature missmatch on accepted connection");
return false;
}
is_continue = false;
break;
}
{
bucket_head* phead = (bucket_head*)m_cach_in_buffer.data();
if(LEVIN_SIGNATURE != phead->m_signature)
{
LOG_ERROR("Signature missmatch on accepted connection");
return false;
}
m_current_head = *phead;
}
m_cach_in_buffer.erase(0, sizeof(bucket_head));
m_state = conn_state_reading_body;
break;
case conn_state_reading_body:
if(m_cach_in_buffer.size() < m_current_head.m_cb)
{
is_continue = false;
break;
}
{
std::string buff_to_invoke;
if(m_cach_in_buffer.size() == m_current_head.m_cb)
buff_to_invoke.swap(m_cach_in_buffer);
else
{
buff_to_invoke.assign(m_cach_in_buffer, 0, (std::string::size_type)m_current_head.m_cb);
m_cach_in_buffer.erase(0, (std::string::size_type)m_current_head.m_cb);
}
if(m_current_head.m_have_to_return_data)
{
std::string return_buff;
m_current_head.m_return_code = m_config.m_pcommands_handler->invoke(m_current_head.m_command, buff_to_invoke, return_buff, m_conn_context);
m_current_head.m_cb = return_buff.size();
m_current_head.m_have_to_return_data = false;
std::string send_buff((const char*)&m_current_head, sizeof(m_current_head));
send_buff += return_buff;
if(!m_psnd_hndlr->do_send(send_buff.data(), send_buff.size()))
return false;
}
else
m_config.m_pcommands_handler->notify(m_current_head.m_command, buff_to_invoke, m_conn_context);
}
m_state = conn_state_reading_head;
break;
default:
LOG_ERROR("Undefined state in levin_server_impl::connection_handler, m_state=" << m_state);
return false;
}
}
return true;
}
}
}
#endif //_LEVIN_PROTOCOL_HANDLER_H_
|
