23062网络编程day2

1. TCP的服务器 客户端的代码

服务器

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888

#define IP "192.168.114.104"

int main(int argc, const char *argv[])
{
	//创建流式套接字 socket
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success! sfd = %d\n",sfd);
	    //允许端口快速的被复用
    int reuse = 1;                                                            
    if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }
    printf("允许端口快速的被复用成功\n");
	//绑定服务器的地址信息 --->必须绑定 bind
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr= inet_addr(IP);
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin)) < 0)
	{
		ERR_MSG("bind");
		return -1;
	}
	//将套接字设置为被动监听状态 listen
	if(listen(sfd,128)<0)
	{
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success!\n");
	//获取一个已经完成的客户端信息，生成一个新的文件描述符 accept
	int newfd=-1;
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if(newfd<0)
	{
		ERR_MSG("newfd");
		return -1;
	}
	printf("[%s:%d]客户端连接成功 newfd=%d\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);

	char buf[128]="";
	ssize_t res=0;
	while(1)
	{
		bzero(buf,sizeof(buf));
	//接收
	res=recv(newfd,buf,sizeof(buf),0);
	if(res<0)
	{
		ERR_MSG("recv");
		return -1;
	}
	else if(0==res)
	{
		printf("[%s:%d]客户端下线 newfd=%d\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
		break;
	}

		printf("[%s:%d] @_@:%s\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
	//发送
	strcat(buf,"*_*");
	if(send(newfd,buf,sizeof(buf),0)<0)
	{
		ERR_MSG("send");
		return -1; 
	}

	}
	close(newfd);
	//关闭文件描述符
	if(close(sfd)<0)
	{
		ERR_MSG("close");
		return -1;
	}
	return 0;
}

客户端

#include 

#define ERR_MSG(msg)  do{\
    fprintf(stderr, "__%d__:", __LINE__); \
    perror(msg);\
}while(0)

#define PORT 8888               //服务器绑定的端口号
#define IP  "192.168.114.104"   //服务器绑定的IP


int main(int argc, const char *argv[])
{
	//创建流式套接字  socket
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	if(cfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success cfd=%d\n",cfd);
  //绑定客户端的地址信息---》非必须绑定
    
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	 //连接指定服务器 connect
	 if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	 {
		 ERR_MSG("connect");
		 return -1;
	 }
	 printf("connect success\n");

	 char buf[128]="";
	 ssize_t res=0;
	 while(1)
	 {
		 //清空字符串
		 bzero(buf,sizeof(buf));
		 printf("请输入>>>");
		 fgets(buf,sizeof(buf),stdin);
		 buf[strlen(buf)-1]='\0';
		 //发送
		 if(send(cfd,buf,sizeof(buf),0)<0)
		 {
			 ERR_MSG("send");
			 return -1;
		 }
		 printf("send success\n");
		 //清空字符串
		 memset(buf,0,sizeof(buf));
		 //接受
		 res=recv(cfd,buf,sizeof(buf),0);
		 if(res<0)
		 {
			 ERR_MSG("recv");
			 return -1;
		 }
		 else if(res==0)
		 {
			 printf("服务器下线\n");
			 break;
		 }
		 printf("cfd=%d , %s",cfd,buf);
	 }
	 if(close(cfd)<0)
	 {
		ERR_MSG("close");
		return -1;
	 }
	return 0;
}

2. UDP服务器客户端代码

服务器

#include 

#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__:",__LINE__);\
	perror(msg);\
}while(0)

#define PORT 8888

#define IP "192.168.114.104"

int main(int argc, const char *argv[])
{
	//创建报式套接字 socket
	int sfd = socket(AF_INET,SOCK_DGRAM,0);
	if(sfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success! sfd = %d\n",sfd);

	//填充服务器的地址信息结构体
	struct sockaddr_in sin;
    sin.sin_family      = AF_INET;      //必须填AF_INET;
    sin.sin_port        = htons(PORT);  //端口号的网络字节序，1024-49151
    sin.sin_addr.s_addr = inet_addr(IP);//本机IP, ifconfig
	//绑定地址信息结构体
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success\n");

	char buf[128]="";
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	while(1)
	{
		//清空数据
		bzero(buf,sizeof(buf));
		if(recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, &addrlen) < 0)
        {
            ERR_MSG("recv");
            return -1;
        }
        printf("[%s:%d] : %s\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port), buf);

        //发送数据----->谁发给我，我发还给谁
        strcat(buf, "*_*");
        if(sendto(sfd, buf, sizeof(buf), 0, (struct sockaddr*)&cin, sizeof(cin)) < 0)
        {
            ERR_MSG("sendto");
            return -1;
        }
        printf("sendto success\n");
	}

	close(sfd);
	return 0;
}

客户端

#include 

#define ERR_MSG(msg)  do{\
    fprintf(stderr, "__%d__:", __LINE__); \
    perror(msg);\
}while(0)

#define PORT 8888               //服务器绑定的端口号
#define IP  "192.168.114.104"   //服务器绑定的IP


int main(int argc, const char *argv[])
{
    //创建报式套接字 socket
    int sfd = socket(AF_INET, SOCK_DGRAM, 0);
    if(sfd < 0)
    {
        ERR_MSG("socket");
        return -1;
    }
    printf("socket create success sfd=%d\n", sfd);

     struct sockaddr_in sin;
    sin.sin_family      = AF_INET;      //必须填AF_INET;
    sin.sin_port        = htons(PORT);  //服务器绑定的端口号
    sin.sin_addr.s_addr = inet_addr(IP);//服务器绑定的IP

    char buf[128] = "";
    ssize_t res = 0;
	socklen_t addrlen=sizeof(sin);
    while(1)
    {
        //清空字符串
        bzero(buf, sizeof(buf));    //memset
        printf("请输入>>> ");
        fgets(buf, sizeof(buf), stdin);
        buf[strlen(buf)-1] = 0;

        //发送
        if(sendto(sfd, buf, sizeof(buf), 0,(struct sockaddr*)&sin,sizeof(sin)) < 0)
        {
            ERR_MSG("send");
            return -1;
        }
        printf("send success\n");

        bzero(buf, sizeof(buf));    //memset
        //接收
        res = recvfrom(sfd, buf, sizeof(buf), 0,(struct sockaddr*)&sin,&addrlen);
        if(res < 0)
        {
            ERR_MSG("recv");
            return -1;
        }
        else if(0 == res)
        {
            printf("服务器下线 sfd=%d\n", sfd);
            break;
        }
        printf("sfd=%d : %s\n", sfd, buf);

    }

	//关闭套接字释放资源
		close(sfd);
       return 0;
}

3.思维导图