50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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int main(int argc, char *argv[])
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{
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int server_sockfd;
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int len;
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struct sockaddr_in my_addr; //服务器网络地址结构体
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struct sockaddr_in remote_addr; //客户端网络地址结构体
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int sin_size;
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char buf[BUFSIZ]; //数据传送的缓冲区
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memset(&my_addr,0,sizeof(my_addr)); //数据初始化--清零
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my_addr.sin_family=AF_INET; //设置为IP通信
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my_addr.sin_addr.s_addr=INADDR_ANY;//服务器IP地址--允许连接到所有本地地址上
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my_addr.sin_port=htons(8000); //服务器端口号
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/*创建服务器端套接字--IPv4协议，面向无连接通信，UDP协议*/
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if((server_sockfd=socket(PF_INET,SOCK_DGRAM,0))<0)
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{
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perror("socket error");
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return 1;
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}
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/*将套接字绑定到服务器的网络地址上*/
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if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)
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{
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perror("bind error");
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return 1;
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}
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sin_size=sizeof(struct sockaddr_in);
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printf("waiting for a packet...\n");
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/*接收客户端的数据并将其发送给客户端--recvfrom是无连接的*/
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if((len=recvfrom(server_sockfd,buf,BUFSIZ,0,(struct sockaddr *)&remote_addr,&sin_size))<0)
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{
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perror("recvfrom error");
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return 1;
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}
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printf("received packet from %s:\n",inet_ntoa(remote_addr.sin_addr));
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buf[len]='\0';
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printf("contents: %s\n",buf);
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/*关闭套接字*/
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close(server_sockfd);
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return 0;
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}
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