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TCP源码，和注释，及应用

2023-11-19 12:31:06 2561 TCP

TCP（Transmission Control Protocol，传输控制协议）是一种面向连接的、可靠的、基于字节流的传输层通信协议。它在因特网协议族（TCP/IP协议族）中担任主要的传输协议，为许多应用程序（如Web浏览器和电子邮件客户端）提供可靠的数据传输服务。

以下是一个简化的TCP源代码示例，并带有注释，以帮助您更好地理解TCP的实现。请注意，这只是一个示例，实际的TCP实现会更加复杂。

c复制代码

	#include
	#include
	#include

	// 定义TCP连接的状态
	enum tcp_state {
	TCP_CLOSED,
	TCP_LISTEN,
	TCP_SYN_SENT,
	TCP_SYN_RECV,
	TCP_ESTABLISHED,
	TCP_CLOSE_WAIT,
	TCP_LAST_ACK,
	TCP_tiME_WAIT
	};

	struct tcp_connection {
	enum tcp_state state;
	unsigned short local_port;
	unsigned short remote_port;
	unsigned int sequence_number;
	unsigned int acknowledgment_number;
	unsigned short window_size;
	unsigned short urgent_pointer;
	unsigned char data_offset;
	unsigned char flags;
	struct socket *socket;
	};

	// 创建一个新的TCP连接
	struct tcp_connection *create_tcp_connection(unsigned short local_port, unsigned short remote_port) {
	struct tcp_connection conn = (struct tcp_connection ) malloc(sizeof(struct tcp_connection));
	conn->state = TCP_CLOSED;
	conn->local_port = local_port;
	conn->remote_port = remote_port;
	conn->sequence_number = 0;
	conn->acknowledgment_number = 0;
	conn->window_size = 65535; // 默认窗口大小为64KB
	conn->urgent_pointer = 0;
	conn->data_offset = 0; // 默认数据偏移量为0
	conn->flags = 0; // 默认标志位为0
	conn->socket = NULL; // 初始时没有关联的套接字
	return conn;
	}