基于socket的回射服务器

service 端

cpp 复制代码

#include<unistd.h>//read/write
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
 
#define ERR_EXIT(m)  \
	do\
	{\
		perror(m);\
		exit(EXIT_FAILURE);\
	}while (0)
	
 
int main(void)
{
	int listenfd;//被动套接字
	if(	(listenfd = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0)//创建套接字小于0表示失败
		ERR_EXIT("socket");
 
	struct sockaddr_in servaddr;
	memset(&servaddr,0,sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(5188);
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//表示本机的任意地址
	/*servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");*/
	/*inet_aton("127.0.0.1",&servaddr.sin_addr);*/
 
    int on=1;
    if(setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on))<0)
    {
        ERR_EXIT("setsocketopt");
    }
	if(bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
		ERR_EXIT("bind");
 
	if(listen(listenfd,SOMAXCONN)<0)//监听后变为被动套接字
		ERR_EXIT("listen");
	
	struct sockaddr_in peeraddr;
	socklen_t peerlen = sizeof(peeraddr);
	int conn;//主动套接字
	if((conn = accept(listenfd,(struct sockaddr*)&peeraddr,&peerlen))<0)
		ERR_EXIT("accept");
 
	char recvbuf[1024];
	while(1)
	{
		memset(recvbuf,0,sizeof(recvbuf));
		int ret = read(conn,recvbuf,sizeof(recvbuf));
 
		fputs(recvbuf,stdout);//打印
		write(conn,recvbuf,ret);//回射
	}
	close(conn);
	close(listenfd);
	return 0;
}

client端

cpp 复制代码

#include<unistd.h>//read/write
 
#include <sys/types.h>
#include <sys/socket.h>
 
 
#include <netinet/in.h>
#include <arpa/inet.h>
 
 
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
 
#define ERR_EXIT(m)  \
	do\
	{\
		perror(m);\
		exit(EXIT_FAILURE);\
	}while (0)
	
 
int main(void)
{
	int sock;//被动套接字
	if(	(sock = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0)//创建套接字小于0表示失败
		ERR_EXIT("socket");
     printf("line:%d \n",__LINE__);
	struct sockaddr_in servaddr;
	memset(&servaddr,0,sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(5188);
	servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");//指定服务器端地址
    printf("line:%d \n",__LINE__);
	if(connect(sock,(struct sockaddr*)&servaddr,sizeof(servaddr))<0)
		ERR_EXIT("connect");
    printf("connect success \n");
	char sendbuf[1024] = {0};
	char recvbuf[1024] = {0};
	while(fgets(sendbuf,sizeof(sendbuf),stdin)!=NULL)
	{
        printf("sendbuf:%s  \n",sendbuf);
 
		write(sock,sendbuf,strlen(sendbuf));//发送
 
		int ret = read(sock,recvbuf,sizeof(recvbuf));//读取接收缓冲区内容
        memset(recvbuf,0,sizeof(recvbuf));
		memset(sendbuf,0,sizeof(sendbuf));
		fputs(recvbuf,stdout);//输出到标准输出
	}
 
	close(sock);
 
	return 0;
}