TCP/IP 三次握手的代码笔记

最新推荐文章于 2025-03-16 23:53:47 发布

小白程序猿Alex

最新推荐文章于 2025-03-16 23:53:47 发布

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文章标签： C++ TCP IP SOCKET

本文链接：https://blog.youkuaiyun.com/github_36604701/article/details/54586555

版权

//server

#include <sys/socket.h>
#include <iostream>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>
using namespace std;

char buf[512];
int nByte;

int main()
{
	//create socket
	int fd = 0;
	if((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
	{
		cout << "socket creating error!\n";
		return -1;
	}

	//bind
	struct sockaddr_in srv;
	srv.sin_family	= AF_INET; 
	srv.sin_port	= htons(6666);
	srv.sin_addr.s_addr	= htonl(INADDR_ANY);
	if(bind(fd, (struct sockaddr *) &srv, sizeof(srv)) < 0)
	{
		cout << "bind error!\n";
		return -1;
	}

	//listen
	if(listen(fd, 5) < 0)
	{
		cout << "listen error!\n";
		return -1;
	}

	//accept
	struct sockaddr_in cli;
	int newfd = 0;
	auto cli_len = sizeof(cli);
	newfd = accept(fd, (struct sockaddr *)&cli, &cli_len);
	if(newfd < 0)
	{
		cout << "accept error\n";
		return -1;
	}

	if((nByte = read(newfd, buf, sizeof(buf))) < 0)
	{
		cout << "read error!\n";
	}

	cout << buf << endl;
	close(newfd);


	return 0;
}

//client

#include <sys/socket.h>
#include <iostream>
#include <netinet/in.h>
#include <unistd.h>
#include <arpa/inet.h>
using namespace std;


int nBytes;

int main()
{
	char buf[512] = "alex is cool";
	//create socket
	int fd = 0;
	if((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
	{
		cout << "socket creating error!\n";
		return -1;
	}

	//connect
	struct sockaddr_in srv;
	srv.sin_family	= AF_INET; 
	srv.sin_port	= htons(6666);
	srv.sin_addr.s_addr	= inet_addr("192.168.101.137");
	if(connect(fd, (struct sockaddr*)&srv, sizeof(srv)) < 0)
	{
		cout << "connect error!\n";
		return -1;
	}

	if((nBytes = write(fd, buf, sizeof(buf))) < 0);
	{
		cout << "write error!\n";
		return -1;
	}

	close(fd);




	return 0;
}