网络编程 day2

1.

2.

tcp服务器
 

#include<my_head.h>
#define PORT 9999
#define IP "192.168.125.79"
int main(int argc, const char *argv[])
{
	//创建套接字 socket
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}

    //允许端口快速复用
    int reuse = 1;
    if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }                                                                           
    printf("允许端口快速复用成功\n");
	
	//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;
	}
	
	//监听 listen
	if(listen(sfd,128)<0)
	{
		ERR_MSG("listen");
		return -1;
	}
	
	//接收 accept
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);
	int newfd=accept(sfd,(struct sockaddr *)&cin,&addrlen);
	if(newfd<0)
	{
		ERR_MSG("accept");
		return -1;
	}
	printf("[%s | %d]:客户端链接成功\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));

	char buf[128]="";
	while(1)
	{
		//读取
		bzero(buf,sizeof(buf));
		ssize_t res =recv(newfd,buf,sizeof(buf),0);
		if(res<0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(res==0)
		{
			printf("客户端关闭\n");
			return -1;
		}
		printf("recv success\n");
		printf("[%s | %d] : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
		if(strcmp(buf,"exit")==0)
			break;
	
		//写入
		bzero(buf,sizeof(buf));
		printf("please receive a message >>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		if(send(newfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");

		
	}
	close(sfd);
	close(newfd);
	return 0;
}

tcp客户端

#include<my_head.h>
#define PORT 7777
#define IP "192.168.125.103"
int main(int argc, const char *argv[])
{
	//创建套接字 socket
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}

    //允许端口快速复用
    int reuse = 1;
    if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)
    {
        ERR_MSG("setsockopt");
        return -1;
    }                                                                           
    printf("允许端口快速复用成功\n");
	
	//可不绑定 bind
	//不监听
	//不接收
	
	//连接服务器connect 
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	if(connect(sfd,(struct sockaddr *)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	
	char buf[128]="";
	while(1)
	{	
		//写入
		bzero(buf,sizeof(buf));
		printf("please receive a message >>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		if(send(sfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
	
		if(strcmp(buf,"exit")==0)
			break;

		//读取
		bzero(buf,sizeof(buf));
		ssize_t res =recv(sfd,buf,sizeof(buf),0);
		if(res<0)
		{
			ERR_MSG("recv");
			return -1;
		}
		printf("recv success\n");
		printf("[%s | %d] : %s\n",IP,PORT,buf);
		
	}
	close(sfd);

	return 0;
}

udp服务器
 

#include<my_head.h>
#define PORT 8888
#define IP "192.168.125.79"
int main(int argc, const char *argv[])
{
	int sfd =socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	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,(socklen_t)sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	struct sockaddr_in cin;
	char buf[128]="";
	socklen_t len=sizeof(cin);
	ssize_t res =0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		res=recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,&len);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s | %d] : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
		if(strcmp(buf,"exit")==0)
			break;

		strcat(buf,": get it success");
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,len)<0)
		{
			ERR_MSG("sendto");
			return -1;
		}

		printf("send success\n");

	}
	close(sfd);
	return 0;
}

udp客户端

#include<my_head.h>
#define PORT 7777
#define IP "192.168.125.103"
int main(int argc, const char *argv[])
{
	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
		ERR_MSG("socket");
		return -1;
	}
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	char buf[128]="";
	socklen_t len =sizeof(sin);
	struct sockaddr_in recvaddr;
	socklen_t addrlen=sizeof(recvaddr);
	while(1)
	{
		bzero(buf,sizeof(buf));
		printf("please enter >>> ");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr *)&sin,len)<0)
		{
			ERR_MSG("sendto");
			return -1;
		}
		if(strcmp(buf,"exit")==0)
			break;
		bzero(buf,sizeof(buf));
		if(recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr *)&recvaddr,&addrlen)<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s | %d] : %s\n",inet_ntoa(recvaddr.sin_addr),ntohs(recvaddr.sin_port),buf);
	}
	return 0;
}