boost 编写finger服务

本篇是模仿PYTHON TWISTED写一个FINGER示例。

从最简单的链接到通过接收字符串返回不同的内容

1 最简单的链接

 #include <ctime>
 #include <iostream>
 #include <string>
 #include <boost/bind.hpp>
 #include <boost/shared_ptr.hpp>
 #include <boost/enable_shared_from_this.hpp>
 #include <boost/asio.hpp>

 using boost::asio::ip::tcp;

 int main()
 {
     try{
         boost::asio::io_service io_service;
         io_service.run();
     }
     catch (std::exception& e) {
         std::cerr << e.what() << std::endl;
     }

     std::cout << "finished!" << std::endl;
     return ;
 }

运行显示如下

finished!
请按任意键继续. . .

2 接收ACCEPT请求 然后丢弃

#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;

static USHORT defaultPort = ;

class tcp_server {
public:
    tcp_server(boost::asio::io_service& io_service) :
        io_service_(io_service),
        acceptor_(io_service, tcp::endpoint(tcp::v4(), defaultPort)) {
        start_accept();
    }
private:
    void start_accept() {
        boost::shared_ptr<tcp::socket> new_connection(new tcp::socket(io_service_));

        acceptor_.async_accept(*new_connection,boost::bind(&tcp_server::handle_accept,this,
            new_connection,boost::asio::placeholders::error));
    }

    void handle_accept(boost::shared_ptr<tcp::socket> new_connection,
        const boost::system::error_code error) {
        if (!error) {
            std::cout << "recv a connection!" << std::endl;
            new_connection->shutdown(boost::asio::socket_base::shutdown_type::shutdown_both);
        }
        start_accept();
    }

    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};

int main()
{
    try {
        boost::asio::io_service io_service;
        tcp_server server(io_service);
        io_service.run();
    }
    catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
    }

    std::cout << "finished!" << std::endl;
    return ;
}

运行显示如下：

recv a connection!

客户端运行 显示

telnet 127.0.0.1 1123

3 接收连接发送过来的内容 显示 然后关闭

#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;

static USHORT defaultPort = ;

class tcp_connection :public boost::enable_shared_from_this<tcp_connection>
{
public:
    typedef boost::shared_ptr<tcp_connection> pointer;
    static pointer create(boost::asio::io_service& io_service) {
        return pointer(new tcp_connection(io_service));
    }

    tcp::socket& socket() {
        return socket_;
    }

    void start() {
        boost::asio::async_read_until(socket_, input_buffer_, '\n',
            boost::bind(&tcp_connection::handle_read, shared_from_this(), _1));
    }
private:
    void handle_read(const boost::system::error_code& err) {
        if (!err) {
            std::string line;
            std::istream is(&input_buffer_);
            std::getline(is,line);
            if (!line.empty())
            {
                std::cout << "Received: " << line << "\n";
            }
            socket_.shutdown(boost::asio::socket_base::shutdown_both);
        }
    }

    tcp_connection(boost::asio::io_service& io_service)
        :socket_(io_service) {}

    boost::asio::streambuf input_buffer_;
    tcp::socket    socket_;
    std::string message_;
};

class tcp_server {
public:
    tcp_server(boost::asio::io_service& io_service) :
        io_service_(io_service),
        acceptor_(io_service, tcp::endpoint(tcp::v4(), defaultPort)) {
        start_accept();
    }
private:
    void start_accept() {
        tcp_connection::pointer new_connection =
            tcp_connection::create(acceptor_.get_io_service());

        acceptor_.async_accept(new_connection->socket(),
            boost::bind(&tcp_server::handle_accept, this, new_connection,
                boost::asio::placeholders::error));
        std::cout << "new a connection" << std::endl;
    }

    void handle_accept(tcp_connection::pointer new_connection,
        const boost::system::error_code& error) {
        if (!error) {
            new_connection->start();
        }
        start_accept();
    }

    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};

int main()
{
    try {
        boost::asio::io_service io_service;
        tcp_server server(io_service);
        io_service.run();
    }
    catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
    }

    std::cout << "finished!" << std::endl;
    return ;
}

运行并TELNET连接后显示如下

new a connection
new a connection
Received: sadasd

4 接收连接发送内容 并返回指定内容

#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;

static USHORT defaultPort = ;

class tcp_connection :public boost::enable_shared_from_this<tcp_connection>
{
public:
    typedef boost::shared_ptr<tcp_connection> pointer;
    static pointer create(boost::asio::io_service& io_service) {
        return pointer(new tcp_connection(io_service));
    }

    tcp::socket& socket() {
        return socket_;
    }

    void start() {
        boost::asio::async_read_until(socket_, input_buffer_, '\n',
            boost::bind(&tcp_connection::handle_read, shared_from_this(), _1));
    }
private:
    void handle_read(const boost::system::error_code& err) {
        if (!err) {
            std::string line;
            std::istream is(&input_buffer_);
            std::getline(is, line);
            if (!line.empty())
            {
                std::cout << line << "\n";
            }
            boost::asio::async_write(socket_,
                boost::asio::buffer("no this user", strlen("no this user")+),
                boost::bind(&tcp_connection::handle_write, shared_from_this(),
                    boost::asio::placeholders::error));

        }
    }

    void handle_write(const boost::system::error_code& error) {
        if (!error) {
            socket_.shutdown(boost::asio::socket_base::shutdown_both);
        }
    }

    tcp_connection(boost::asio::io_service& io_service)
        :socket_(io_service) {}

    boost::asio::streambuf input_buffer_;
    tcp::socket    socket_;
    std::string message_;
};

class tcp_server {
public:
    tcp_server(boost::asio::io_service& io_service) :
        io_service_(io_service),
        acceptor_(io_service, tcp::endpoint(tcp::v4(), defaultPort)) {
        start_accept();
    }
private:
    void start_accept() {
        tcp_connection::pointer new_connection =
            tcp_connection::create(acceptor_.get_io_service());

        acceptor_.async_accept(new_connection->socket(),
            boost::bind(&tcp_server::handle_accept, this, new_connection,
                boost::asio::placeholders::error));
        std::cout << "new a connection" << std::endl;
    }

    void handle_accept(tcp_connection::pointer new_connection,
        const boost::system::error_code& error) {
        if (!error) {
            new_connection->start();
        }
        start_accept();
    }

    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};

int main()
{
    try {
        boost::asio::io_service io_service;
        tcp_server server(io_service);
        io_service.run();
    }
    catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
    }

    std::cout << "finished!" << std::endl;
    return ;
}

运行后显示如下

new a connection
new a connection
asdas

telnet客户端显示

no this user

遗失对主机的连接。

5 接收发送的内容 并在记录中查找是否有该内容的记录

#include <ctime>
#include <iostream>
#include <string>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/asio.hpp>
#include <map>

using boost::asio::ip::tcp;

static USHORT defaultPort = ;

typedef std::map<std::string, std::string> UserMap;
UserMap users;

class tcp_connection :public boost::enable_shared_from_this<tcp_connection>
{
public:
    typedef boost::shared_ptr<tcp_connection> pointer;
    static pointer create(boost::asio::io_service& io_service) {
        return pointer(new tcp_connection(io_service));
    }

    tcp::socket& socket() {
        return socket_;
    }

    void start() {
        boost::asio::async_read_until(socket_, input_buffer_, '\n',
            boost::bind(&tcp_connection::handle_read, shared_from_this(), _1));
    }
private:
    void handle_read(const boost::system::error_code& err) {
        if (!err) {
            std::istream is(&input_buffer_);
            is >> line_;
            if (!line_.empty())
            {
                std::cout << line_ << "\n";
                UserMap::iterator it = users.find(line_);
                if (it != users.end())
                {
                    line_ = it->second;
                }
                else {
                    line_ = "no this user";
                }
            }
            else {
                line_ = "string error!";
            }
            boost::asio::async_write(socket_,
                boost::asio::buffer(line_, line_.size()),
                boost::bind(&tcp_connection::handle_write, shared_from_this(),
                    boost::asio::placeholders::error));

        }
    }

    void handle_write(const boost::system::error_code& error) {
        if (!error) {
            socket_.shutdown(boost::asio::socket_base::shutdown_both);
        }
    }

    tcp_connection(boost::asio::io_service& io_service)
        :socket_(io_service) {}

    std::string line_;
    boost::asio::streambuf input_buffer_;
    tcp::socket    socket_;
    std::string message_;
};

class tcp_server {
public:
    tcp_server(boost::asio::io_service& io_service) :
        io_service_(io_service),
        acceptor_(io_service, tcp::endpoint(tcp::v4(), defaultPort)) {
        start_accept();
    }
private:
    void start_accept() {
        tcp_connection::pointer new_connection =
            tcp_connection::create(acceptor_.get_io_service());

        acceptor_.async_accept(new_connection->socket(),
            boost::bind(&tcp_server::handle_accept, this, new_connection,
                boost::asio::placeholders::error));
        std::cout << "new a connection" << std::endl;
    }

    void handle_accept(tcp_connection::pointer new_connection,
        const boost::system::error_code& error) {
        if (!error) {
            new_connection->start();
        }
        start_accept();
    }

    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};

int main()
{
    try {
        users["DEF"] = "PASS";
        boost::asio::io_service io_service;
        tcp_server server(io_service);
        io_service.run();
    }
    catch (std::exception& e) {
        std::cerr << e.what() << std::endl;
    }

    std::cout << "finished!" << std::endl;
    return ;
}

运行后显示如下

new a connection
new a connection
dda
new a connection
DEF

telnet客户端显示

PASS

遗失对主机的连接。

以上代码所有连接 均以telnet作为客户端

telnet 127.0.0.1 1123
正在连接127.0.0.1...