/*
tcp客戶端程式，注意一定要修改addr的值和本機相同才能正常工作
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>			/* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
	int sock;	
	int server_len;
	struct 	sockaddr_in server_address;
	
	sock = socket(PF_INET, SOCK_STREAM, 0); //建立SOCKET
	server_address.sin_family = AF_INET;				//指定通訊協議
	server_address.sin_addr.s_addr = htonl(INADDR_ANY);//或是指定當前IP地址inet_addr("192.168.88.123");
	server_address.sin_port = htons(12345);
	connect(sock,(struct sockaddr*)&server_address,sizeof(server_address));

	char sendbuf[1024]={0};
	char recvbuf[1024]={0};
	
	while(fgets(sendbuf,sizeof(sendbuf),stdin) != NULL)
	{
		write(sock,sendbuf,sizeof(sendbuf));
		read(sock,recvbuf,sizeof(recvbuf));
		fputs(recvbuf,stdout);
		memset(sendbuf,0,sizeof(sendbuf));	
		memset(recvbuf,0,sizeof(recvbuf));
	}
	close(sock);
	return 0;
}
 

#include <stdio.h>
#include <unistd.h>
/*
tcp伺服器程式
*/
#include <sys/types.h>			/* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
	int server_sockfd,client_sockfd;	
	int server_len,client_len;
	struct 	sockaddr_in server_address,client_address;

	server_sockfd = socket(PF_INET, SOCK_STREAM, 0);	//建立SOCKET
	server_address.sin_family = AF_INET;				//指定通訊協議
	server_address.sin_addr.s_addr = htonl(INADDR_ANY);//相當於0.0.0.0
	server_address.sin_port = htons(12345);
	server_len = sizeof(server_address);

	bind(server_sockfd, (struct sockaddr *)&server_address, server_len);	//繫結SOCKET物件
	listen(server_sockfd, SOMAXCONN);	
	printf("SOMAXCONN:%d\n",SOMAXCONN);
	client_len=sizeof(client_address);
	client_sockfd=accept(server_sockfd, (struct sockaddr *)&client_address, (socklen_t *)&client_len);
	char recvbuf[1024];
	while(1)
	{
		memset(recvbuf,0,sizeof(recvbuf));
		read(client_sockfd, recvbuf, sizeof(recvbuf));
		fputs(recvbuf,stdout);
		write(client_sockfd,recvbuf,sizeof(recvbuf));
	}

	close(server_sockfd);
	close(client_sockfd);
	return 0;
}