libsockets下载 - libsockets源代码下载

libsockets（正在进行中！！！）

一个独立于平台的 C++ 套接字库，具有透明的 SSL 支持（以及更多内容）。

在此处获取：[支持 SSL 的 Windows x64 静态和共享库] 或 [不支持 SSL]

示例

袜子::ClientSocket 和袜子::ServerSocket

# include " libsockets.h "

void client () {
  socks::ClientSocket clientSocket;

  if (clientSocket. connectTo ( " 127.0.0.1 " , " 10000 " ) == 0 ) {
    std::string hello = " Hello World " ;
    clientSocket. sendData (hello. c_str (), hello. size ());
  }
};

int main () {
  client ();
};

# include " libsockets.h "

void server () {
  socks::ServerSocket serverSocket;
  
  serverSocket. listenForConnections ( " 127.0.0.1 " , " 10000 " );
  socks::ClientSocket clientSocket = serverSocket. acceptConnection ();
  
  char buf[ 512 ];
  auto len = clientSocket. receiveData (buf, 512 );
  if (len > 0 ) {
    buf[len]= 0 ;
    std::cout << buf << std::endl;
  }
};

int main () {
  server ();
};

$ > ./server &
$ > ./client

袜子::服务器（ `socks::makeThreaded[SSL]Server`和`socks::makeMultiplexed[SSL]Server` ）

# include " libsockets.h "

class MyContext {
public:
  int value; // whatever context you need to maintain
};

void onReceive (socks::Context<MyContext> &context, std::istream &inp, std::ostream &outp) {
  std::string word;

  while (inp >> word)
    outp << context. getContext (). value ++ << " " << word << std::endl;
};

void onConnect (socks::Context<MyContext> &context, std::istream &inp, std::ostream &outp) {
  context. getContext (). value = 0 ;
  outp << " Hello " << std::endl;
};

int main () {
  auto myServer = socks::factory::makeThreadedServer<MyContext>(
    onReceive,
    onConnect /* ,
    onDisconnect,
    afterWrite
    */
    ); // onReceive is mandatory, onConnect, onDisconnect & afterWrite are optional
    
  myServer. listen ( " 127.0.0.1 " , " 10000 " ); // serves
};

您可以将socks::factory::makeThreadedServer替换为socks::factory::makeMultiplexedServer 。第一个实例化一个服务器，为每个客户端创建一个线程（使用阻塞 I/O），第二个实例化一个服务器，该服务器具有更具可扩展性的架构，使用反应器模式（使用非阻塞 I/O，每个线程为多个客户端提供服务）。

袜子::DatagramSocket

# include " libsockets.h "

constexpr size_t bufferSize = 4096 ;

int main () {
  socks::DatagramSocket datagramSocket;

  datagramSocket. bindSocket ( " 0.0.0.0 " , " 10000 " );
  char buffer[bufferSize];

  std::pair< int , socks::SocketAddress> ret = datagramSocket. receiveFrom (buffer, bufferSize);
  // ret = pair<bytes received, sender address>
  if (ret. first > 0 ) {
    auto peer = std::move (ret. second );
    std::string reply = " received " + std::to_string (ret. first ) + " bytes " ;
    datagramSocket. sendTo (peer, reply. c_str (), reply. size ());
  } else {
    std::cerr << " error receiving. " << std::endl;
  }
}

您还可以将socks::DatagramSocket转换为“已连接”数据报套接字并使用socks::ClientSocket的接口。

socks::ClientSocket clientSocket = datagramSocket.makeClientSocket(peer); 
/* 
 * from this point on 'datagramSocket' cannot be used anymore,
 * its implementation has been moved to 'clientSocket'.
 */

或者

socks::ClientSocket clientSocket = datagramSocket.makeClientSocket(host, port); // same here

袜子::SocketStream

它是一个封装在std::iostream类中的socks::ClientSocket 。

# include " libsockets.h "

int main () {
  socks::SocketStream socketStream;

  if (socketStream. connectTo ( " 127.0.0.1 " , " 10000 " ) == 0 ) {
    std::string buf;

    std::getline (socketStream, buf); // receiving data
    std::cout << buf << std::endl;
    socketStream << " message received. " << std::endl; // transmitting data
  } else {
    std::cerr << " error connecting. " << std::endl;
  }
}

SSL 支持

只需替换声明：

socks::ClientSocket clientSocket = socks::factory::makeSSLClientSocket;
socks::ServerSocket serverSocket = socks::factory::makeSSLServerSocket;
socks::SocketStream socketStream = socks::factory::makeSSLSocketStream;
socks::Server server = socks::factory::makeThreadedSSLServer<...>(...);
socks::Server server = socks::factory::makeMultiplexedSSLServer<...>(...);

就是这样。对于socks::ServerSocket和socks::Server您还需要证书和密钥文件（默认名称为“cert.pem”和“key.pem”）。生成测试证书和密钥文件：

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes

袜子::工厂

该命名空间包含所有库的工厂方法。

FTP 服务器 (ftpd/)

一个更详细的示例：使用 libsockets 的简单但功能齐全的 FTP 服务器实现（包括 SSL 支持、被动模式、恢复和 FXP 支持）。为用户提供身份验证回调。您还可以注册自定义 SITE 命令。

您可以尝试一下：Windows x64 静态二进制文件

AuthenticationFunction FTPClientInfo::authenticate =
[]( const std::string &username, const std::string &password, FTPClientInfo& clientInfo) {
  /*
   * in here a user profile can be loaded into 'clientInfo'
   * upon authentication in order to define, for example,
   * a home dir, chroot, etc.
   */
  return authService. authenticate (username, password);
};

int main ( int argc, char **argv) {
  FTPServer ftpServer;

  // SITE CLIENT COUNT
  ftpServer. registerSiteCommand (
    " CLIENT " , 
    [&ftpServer]( const std::string &params, FTPClientInfo &clientInfo) {
      std::stringstream ss (params);
      std::string p1;
      ss >> p1;
      std::transform (p1. begin (), p1. end (), p1. begin (), ::toupper);
      if (p1 == " COUNT " )
        return " 200 There is/are " + std::to_string (ftpServer. getClientCount ()) + " client(s) online. " ;
      else
        return std::string ( " 501 Invalid SITE CLIENT parameter. " );
  });

  ftpServer. start ();
}