LINUX SOCKET TCP 通信笔记2

经过了一个多星期的学习，我在这里总结一下关于Linux，Windows的socket TCP通信的不同情形。

1. server，client之间的通信
2. Socket之TCP全双工Server-Client通信
3. client，client之间的通信
4. 一个小应用-------网络聊天室
5. Linux与Windows之间的socket通信
6. socket实现两台pc之间的数据传输功能，包括windows到linux，TCP/IP

一、server，client之间的通信

server

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/socket.h>

#define PORT 5678
#define BUFFER_SIZE 1024
#define MAX_QUEUE 20

int main(int argc, char const *argv[])
{
	//define server_fd
	int server_fd = socket(AF_INET,SOCK_STREAM,0);

	//define sockaddr_in
	struct sockaddr_in server_sockaddr;
	server_sockaddr.sin_family = AF_INET;
	server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	server_sockaddr.sin_port = htons(PORT);

	//define client socket
	char buffer[BUFFER_SIZE];
	struct sockaddr_in client_addr;
	socklen_t length = sizeof(client_addr);

	//bind ip success return 0 fault return -1

	if(bind(server_fd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr)) == -1)
	{
		perror("bind");
		exit(1);
	}
	printf("listen port = %d\n",PORT );

	// listen ,success return 0  fault return -1
	if(listen(server_fd,MAX_QUEUE) == -1)
	{
		perror("listen");
		exit(1);
	}

	printf("wait for connect\n");

	int connect = accept(server_fd,(struct sockaddr *)&client_addr,&length);
	if(connect < 0)
	{
		perror("connect");
		exit(1);
	}

	printf("client connect success\n");
	char server_sendbuf[BUFFER_SIZE];


	while(1)
	{
		fgets(server_sendbuf,sizeof(server_sendbuf),stdin) != NULL;
		printf("send to client: %s\n",server_sendbuf );		
		send(connect, server_sendbuf,strlen(server_sendbuf),0);

		int len = recv(connect,buffer,sizeof(buffer),0);
		if(strcmp(buffer,"exit\n") == 0  || len<= 0)
			break;
		printf("data of client: %s\n",buffer );
		memset(buffer,0,sizeof(buffer));
		memset(server_sendbuf,0,sizeof(server_sendbuf));
	}

	close(connect);
	close(server_fd);
	return 0;
}

client:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/socket.h>


#define PORT 5678
#define BUFFER_SIZE 1024

char * SERVER_IP = "127.1.1.0";

int main(int argc, char const *argv[])
{

	//define socket
	int client_fd = socket(AF_INET, SOCK_STREAM,0);

	//define sockaddr_in

	struct sockaddr_in server_addr;
	memset(&server_addr,0,sizeof(server_addr));
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
	server_addr.sin_port = htons(PORT);


	printf("connect %s:%d\n",SERVER_IP,PORT );
	//connect  server success return 0 fault return -1
	if (connect(client_fd, (struct sockaddr *)&server_addr,sizeof(server_addr)) < 0)
	{
		perror("connect");
		exit(1);
	}
	
	printf("connect server successful\n");

	char sendbuf[BUFFER_SIZE];
	char recvbuf[BUFFER_SIZE];

	while(1)
	{
		fgets(sendbuf,sizeof(sendbuf),stdin) != NULL;
		printf("send data to server: %s\n",sendbuf);
		send(client_fd,sendbuf,strlen(sendbuf),0);

		if(strcmp(sendbuf,"exit\n") == 0)
			break;
		recv(client_fd,recvbuf,sizeof(recvbuf),0);
		printf("recv data from server: %s\n",recvbuf );

		memset(sendbuf,0,sizeof(sendbuf));
		memset(recvbuf,0,sizeof(recvbuf));
	}

	close(client_fd);
	return 0;

}