功能描述
利用UDP網絡通信實現客戶端和服務器的通信
服務器代碼
server.c
#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#include <arpa/inet.h>
//創建UDP實現服務器和客戶端的通信
int main()
{
//創建socket連接
int serfd=0;
serfd=socket(AF_INET,SOCK_DGRAM,0);
if(serfd<0)
{
perror("socke failed");
return -1;
}
printf("socket success\n");
//綁定IP地址和端口信息
int ret=0;
struct sockaddr_in seraddr={0};
seraddr.sin_family=AF_INET;
seraddr.sin_addr.s_addr=inet_addr("192.168.59.131");
seraddr.sin_port=htons(8888);
ret=bind(serfd,(struct sockaddr *)&seraddr,sizeof(seraddr));
if(ret<0)
{
perror("bind failed");
close(serfd);
return -1;
}
printf("bind success\n");
//接收發送自客戶端的消息
while(1)
{
int addrlen=0;
char buf[1024]={0};
struct sockaddr_in clientaddr={0};
addrlen=sizeof(clientaddr);
ret=recvfrom(serfd,buf,sizeof(buf),0,(struct sockaddr *)&clientaddr,&addrlen);
if(ret<0)
{
perror("recvfrom failed");
close(serfd);
return -1;
}
printf("IP=%s,port=%u\n",inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));
printf("recvfrom success\n");
printf("receive: %s\n",buf);
//向客戶端發送消息
memset(buf,0,sizeof(buf));
gets(buf);
ret=sendto(serfd,buf,strlen(buf),0,(struct sockaddr *)&clientaddr,addrlen);
if(ret<0)
{
perror("sendto failed");
close(serfd);
return -1;
}
printf("sendto success\n");
}
close(serfd);
return 0;
}
客戶端代碼
client.c
#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#include <arpa/inet.h>
//創建UDP實現服務器和客戶端的通信
//創建socket連接
int main()
{
//創建socket連接
int clifd=0;
clifd=socket(AF_INET,SOCK_DGRAM,0);
if(clifd<0)
{
perror("socke failed");
return -1;
}
printf("socket success\n");
//向服務器發送消息
while(1)
{
int tolen=0;
int ret=0;
char buf[1024]={0};
gets(buf);
struct sockaddr_in seraddr={0};
seraddr.sin_family=AF_INET;
seraddr.sin_addr.s_addr=inet_addr("192.168.59.131");
seraddr.sin_port=htons(8888);
tolen=sizeof(seraddr);
ret=sendto(clifd,buf,strlen(buf),0,(struct sockaddr *)&seraddr,tolen);
if(ret<0)
{
perror("sendto failed");
close(clifd);
return -1;
}
printf("sendto success\n");
//接收發送自服務器的消息
ret=recvfrom(clifd,buf,sizeof(buf),0,NULL,NULL);
if(ret<0)
{
perror("recvfrom failed");
close(clifd);
return -1;
}
printf("recvfrom success\n");
printf("receive: %s\n",buf);
}
close(clifd);
return 0;
}