tcps.rar_TCPS

#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> int main(int argc, char *argv[]) { int sockfd,new_fd; struct sockaddr_in server_addr; struct sockaddr_in client_addr; int sin_size,portnumber; char hello[]="Hello! Are You Fine?\n"; portnumber=6868; /* 服务器端开始建立socket描述符 */ if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) { fprintf(stderr,"Socket error:%s\n\a",strerror(errno)); exit(1); } /* 服务器端填充 sockaddr结构 */ bzero(&server_addr,sizeof(struct sockaddr_in)); server_addr.sin_family=AF_INET; server_addr.sin_addr.s_addr=htonl(INADDR_ANY); server_addr.sin_port=htons(portnumber); /* 捆绑sockfd描述符 */ if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1) { fprintf(stderr,"Bind error:%s\n\a",strerror(errno)); exit(1); } /* 监听sockfd描述符 */ if(listen(sockfd,5)==-1) { fprintf(stderr,"Listen error:%s\n\a",strerror(errno)); exit(1); } while(1) { /* 服务器阻塞,直到客户程序建立连接 */ sin_size=sizeof(struct sockaddr_in); if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1) { fprintf(stderr,"Accept error:%s\n\a",strerror(errno)); exit(1); } fprintf(stderr,"Server get connection from %s\n", inet_ntoa(client_addr.sin_addr)); int numbytes; char tmp[300]; if ((numbytes=recv(new_fd, tmp, sizeof(tmp), 0)) == -1) { perror("recv"); exit(1); } char type[5]; memcpy(type,tmp,4); type[4]=0; printf("numbytes is %d,recieve :%s\n",numbytes,tmp); printf("type is :%s\n",type); int plant; memcpy(&plant,tmp+4,4); printf("plant is :%d\n",plant); int unit; memcpy(&unit,tmp+8,4); printf("unit is :%d\n",unit); fflush(stdout); /*if(write(new_fd,hello,strlen(hello))==-1) { fprintf(stderr,"Write Error:%s\n",strerror(errno)); exit(1); } */ /* 这个通讯已经结束 */ close(new_fd); /* 循环下一个 */ } close(sockfd); exit(0); }