UDP.rar_UDP_linux UDP_linux UDP makefile_udp linux

基于有连接的方式，客户机产生两个随机数，发送给两个服务器。服务器1（IP：192.168.0.1，port：3254）将这两个数相加；服务器2（IP：192.168.0.10，Port：3255）将这两个数相减。两个服务器分别将运算结果返回给客户机，客户机显示回传的结果。 源程序 客户端： #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <netinet/in.h> #include <sys/socket.h> #include <arpa/inet.h> #include <math.h> #include <netdb.h> int port1=3254; int port2=3255; int main(int argc,char *argv[]){ int sockfd1,sockfd2,sentlen,recvlen1,recvlen2; struct sockaddr_in serveraddr1,serveraddr2; struct sockaddr_in clientaddr; struct hostent *host1,*host2; int *buf1[1024]; int *buf2[1024]; int numbytes; if(argc!=3){ fprintf(stderr,"Usage:%s server_ip server_port\n",argv[0]); exit(1); } srand((int)time(0)); int num1=(int)rand()%100; int num2=(int)rand()%100; printf("the two RandNums are:%d %d\n",num1,num2);//test char string1[10]; char string2[10]; sprintf(string1,"%d\n",num1); sprintf(string2,"%d\n",num2); bzero(&(serveraddr1.sin_zero),8); host1=gethostbyname(argv[1]); serveraddr1.sin_family=AF_INET; serveraddr1.sin_port=htons(port1); serveraddr1.sin_addr.s_addr=htonl(INADDR_ANY); serveraddr1.sin_addr.s_addr=((struct in_addr *)(host1->h_addr))->s_addr; bzero(&(serveraddr2.sin_zero),8); host2=gethostbyname(argv[2]); serveraddr2.sin_family=AF_INET; serveraddr2.sin_port=htons(port2); serveraddr2.sin_addr.s_addr=htonl(INADDR_ANY); serveraddr2.sin_addr.s_addr=((struct in_addr *)(host2->h_addr))->s_addr; if((sockfd1=socket(AF_INET,SOCK_DGRAM,0))==-1){ perror("socket1"); exit(1); } if((sockfd2=socket(AF_INET,SOCK_DGRAM,0))==-1){ perror("socket2"); exit(1); } if((numbytes=sendto(sockfd1,string1,sizeof(string1),0,(struct sockaddr *)&serveraddr1,sizeof(struct sockaddr)))==-1){ perror("sendto1.1"); exit(1); } if((numbytes=sendto(sockfd1,string2,sizeof(string2),0,(struct sockaddr *)&serveraddr1,sizeof(struct sockaddr)))==-1){ perror("sendto1.2"); exit(1); } if((numbytes=sendto(sockfd2,string1,sizeof(string1),0,(struct sockaddr *)&serveraddr2,sizeof(struct sockaddr)))==-1){ perror("sendto2.1"); exit(1); } if((numbytes=sendto(sockfd2,string2,sizeof(string2),0,(struct sockaddr *)&serveraddr2,sizeof(struct sockaddr)))==-1){ perror("sendto2.2"); exit(1); } recvlen1=sizeof(serveraddr1); recvlen2=sizeof(serveraddr2); if((numbytes=recvfrom(sockfd1,buf1,sizeof(buf1),0,(struct sockaddr *)&serveraddr1,&recvlen1))==-1){ perror("recvfrom1"); exit(1); } if((numbytes=recvfrom(sockfd2,buf2,sizeof(buf2),0,(struct sockaddr *)&serveraddr2,&recvlen2))==-1){ perror("recvfrom2"); exit(1); } printf("the result of the two RandNums is:\n%d+%d=%s\n",num1,num2,buf1); printf("the result of the two RandNums is:\n%d-%d=%s\n",num1,num2,buf2); close(sockfd1); close(sockfd2); return 0; } 服务器端（加法） #include <stdio.h> #include <arpa/inet.h> #include <unistd.h> #include <netdb.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/wait.h> #define MYPORT 3254 #define BACKLOG 5 main(){ int sockfd,newfd; int sinsize; struct sockaddr_in myaddr,clientaddr; char buf1[24]; char buf2[24]; char buf[24]; int num1,num2,sum; sockfd=socket(AF_INET,SOCK_DGRAM,0); myaddr.sin_family=AF_INET; myaddr.sin_port=htons(MYPORT); myaddr.sin_addr.s_addr=INADDR_ANY; bzero(&(myaddr.sin_zero),8); if(bind(sockfd,(struct sockaddr *)&myaddr,sizeof(struct sockaddr))==-1){ perror("binds1 error."); exit(1); } while(1){ memset(buf1,0x0,24); memset(buf2,0x0,24); sinsize=sizeof(struct sockaddr_in); if(recvfrom(sockfd,buf1,sizeof(buf1),0,(struct sockaddr *)&clientaddr,&sinsize)<0){ printf("Can'not receive data1.\n"); continue; } if(recvfrom(sockfd,buf2,sizeof(buf2),0,(struct sockaddr *)&clientaddr,&sinsize)<0){ printf("Can'not receive data2.\n"); continue; } num1=atoi(buf1); num2=atoi(buf2); sum=num1+num2; printf("recieve two RandNums:%d %d\n",num1,num2); sprintf(buf,"%d\n",sum); if(sendto(sockfd,buf,sizeof(buf),0,(struct sockaddr *)&clientaddr,sizeof(clientaddr))==-1){ perror("sendto error."); exit(1); } } return 0; } 服务器端（减法） #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/wait.h> #define MYPORT 3255 #define BACKLOG 5 main(){ int sockfd,newfd; int sinsize; struct sockaddr_in myaddr,clientaddr; char buf1[24]; char buf2[24]; char buf[24]; int num1,num2,sum; if((sockfd=socket(AF_INET,SOCK_DGRAM,0))==-1){ perror("sockets2 error."); exit(1); } myaddr.sin_family=AF_INET; myaddr.sin_port=htons(MYPORT); myaddr.sin_addr.s_addr=INADDR_ANY; bzero(&(myaddr.sin_zero),8); if(bind(sockfd,(struct sockaddr *)&myaddr,sizeof(struct sockaddr))==-1){ perror("binds2 error."); exit(1); } while(1){ sinsize=sizeof(struct sockaddr_in); if(recvfrom(sockfd,buf1,sizeof(buf1),0,(struct sockaddr *)&clientaddr,&sinsize)<0){ printf("Can'not receive data1.\n"); continue; } if(recvfrom(sockfd,buf2,sizeof(buf2),0,(struct sockaddr *)&clientaddr,&sinsize)<0){ printf("Can'not receive data2.\n"); continue; } num1=atoi(buf1); num2=atoi(buf2); sum=num1-num2; printf("recieve two RandNums:%d %d\n",num1,num2); sprintf(buf,"%d\n",sum); if(sendto(sockfd,buf,sizeof(buf),0,(struct sockaddr *)&clientaddr,sizeof(clientaddr))==-1){ perror("sendto error."); } } return 0; }