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
|
//
// client.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <cstdlib>
#include <iostream>
#include <boost/bind.hpp>
#include <boost/asio.hpp>
#include <boost/asio/ssl.hpp>
enum { max_length = 1024 };
class client
{
public:
client(boost::asio::io_service& io_service,
boost::asio::ssl::context& context,
boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
: socket_(io_service, context)
{
socket_.set_verify_mode(boost::asio::ssl::verify_peer);
socket_.set_verify_callback(
boost::bind(&client::verify_certificate, this, _1, _2));
boost::asio::async_connect(socket_.lowest_layer(), endpoint_iterator,
boost::bind(&client::handle_connect, this,
boost::asio::placeholders::error));
}
bool verify_certificate(bool preverified,
boost::asio::ssl::verify_context& ctx)
{
// The verify callback can be used to check whether the certificate that is
// being presented is valid for the peer. For example, RFC 2818 describes
// the steps involved in doing this for HTTPS. Consult the OpenSSL
// documentation for more details. Note that the callback is called once
// for each certificate in the certificate chain, starting from the root
// certificate authority.
// In this example we will simply print the certificate's subject name.
char subject_name[256];
X509* cert = X509_STORE_CTX_get_current_cert(ctx.native_handle());
X509_NAME_oneline(X509_get_subject_name(cert), subject_name, 256);
std::cout << "Verifying " << subject_name << "\n";
return preverified;
}
void handle_connect(const boost::system::error_code& error)
{
if (!error)
{
socket_.async_handshake(boost::asio::ssl::stream_base::client,
boost::bind(&client::handle_handshake, this,
boost::asio::placeholders::error));
}
else
{
std::cout << "Connect failed: " << error.message() << "\n";
}
}
void handle_handshake(const boost::system::error_code& error)
{
if (!error)
{
std::cout << "Enter message: ";
std::cin.getline(request_, max_length);
size_t request_length = strlen(request_);
boost::asio::async_write(socket_,
boost::asio::buffer(request_, request_length),
boost::bind(&client::handle_write, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
else
{
std::cout << "Handshake failed: " << error.message() << "\n";
}
}
void handle_write(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error)
{
boost::asio::async_read(socket_,
boost::asio::buffer(reply_, bytes_transferred),
boost::bind(&client::handle_read, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
else
{
std::cout << "Write failed: " << error.message() << "\n";
}
}
void handle_read(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error)
{
std::cout << "Reply: ";
std::cout.write(reply_, bytes_transferred);
std::cout << "\n";
}
else
{
std::cout << "Read failed: " << error.message() << "\n";
}
}
private:
boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_;
char request_[max_length];
char reply_[max_length];
};
int main(int argc, char* argv[])
{
try
{
if (argc != 3)
{
std::cerr << "Usage: client <host> <port>\n";
return 1;
}
boost::asio::io_service io_service;
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::resolver::query query(argv[1], argv[2]);
boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
boost::asio::ssl::context ctx(boost::asio::ssl::context::sslv23);
ctx.load_verify_file("ca.pem");
client c(io_service, ctx, iterator);
io_service.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}
|
