?? server.c
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#include <sys/types.h>#include <sys/socket.h>#include<netinet/in.h>#include <arpa/inet.h>#include <stdio.h>#include <errno.h>#define PORT 3478int main(){ int sockfd,len; struct sockaddr_in addr; int addr_len; char buffer[256]; addr_len = sizeof(addr); if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) == -1) { fprintf(stderr,"open socket error:%s\n",strerror(errno)); exit(1); } bzero(&addr,addr_len); addr.sin_family = AF_INET; addr.sin_port = htons(PORT); addr.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(sockfd,(struct sockaddr *)&addr,addr_len) == -1) { fprintf(stderr,"bind error:%s\n",strerror(errno)); exit(1); } while(1) { bzero(buffer,sizeof(buffer)); len = recvfrom(sockfd,buffer,sizeof(buffer), 0,(struct sockaddr *)&addr,&addr_len); //display address of cilent printf("receive from %s\n",inet_ntoa(addr.sin_addr)); sendto(sockfd,buffer,len,0,(struct sockaddr *)&addr,addr_len); } return 0; }?? 快捷鍵說明
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