计算机网络课程设计—socket编程之服务器与客户机的时间比较

#include <sys/socket.h> //提供socket函数及数据结构 #include <netinet/in.h> //定义数据结构sockaddr_in #include <arpa/inet.h> //提供IP地址转换函数 #include <unistd.h> //提供通用的文件，目录，程序及进程操作的函数 #include <string.h> #include <stdio.h> #include <stdlib.h> #include <netdb.h> //提供getprotobyname函数 #define LENGTH 128 int connect_call(char *des_IP, int port, char *protocol) { struct hostent *host; struct servent *server; struct protoent *pro; struct sockaddr_in addr_server; int s, type; memset(&addr_server, 0, sizeof(addr_server)); addr_server.sin_family = AF_INET; addr_server.sin_port = port; //通过通信协议的名称来获取该协议的其他信息 pro = getprotobyname(protocol); //失败则退出程序 if(pro == NULL) { printf("can't get \"%s\" protocol entry\n", protocol); exit(1); } //返回对应于给定主机名的主机信息 host = gethostbyname(des_IP); if(host != NULL) memcpy(&addr_server.sin_addr, host->h_addr, host->h_length); //将一个点间隔地址转换成一个in_addr else if((addr_server.sin_addr.s_addr = inet_addr(des_IP) == 0xffffffff)) { printf("can't get \"%s\" host entry\n", des_IP); exit(1); } if(protocol == "tcp") type = SOCK_STREAM; else type = SOCK_DGRAM; //创建一个套接字，失败则退出程序，0表示IP协议 s = socket(PF_INET, type, 0); if(s < 0) { printf("can't create socket\n"); exit(1); } //与服务器建立连接并取得socket if(connect(s, (struct socket *)&addr_server, sizeof(addr_server)) < 0) { printf("cant't connect to %s through %d", des_IP, port); exit(1); } return s; } //将时间字符串转换成秒并返回 long cal_in_sec(char *time_string) { long result; result = ((time_string[11]) - 48) * 10 + (time_string[12] - 48) * 3600 + ((time_string[14] - 48) * 10 + (time_string[15] - 48)) * 60 + (time_string[17] + time_string[18] - 96); return result; } Time(char *des_IP, int port) { char buf[LENGTH + 1]; int s, n; char *client_time; time_t time_client; int i; long sec_ser; //服务器的时间，以秒为单位 long sec_cli; //客户机的时间，以秒为单位 long compare; //客户机时间与服务器时间的差 //建立连接 s = connect_call(des_IP, port, "tcp"); while((n = read(s, buf, LENGTH)) > 0) { //打印服务器时间 buf[0] = '\0'; printf("Server Time: "); for(i = 11;i <= 18;i++) printf("%c", buf[i]); printf("\n"); } //打印客户机的时间 time(&time_client); client_time = ctime(&time_client); printf("Client Time: "); for(i = 11; i <= 18;i++) printf("%s", client_time); printf("\n"); sec_ser = cal_in_sec(buf); sec_cli = cal_in_sec(client_time); //显示比较结果 compare = sec_cli - sec_ser; printf("The transport time between server and client is %ld seconds\n", compare); } int main(int argc, char *argv[]) { char *des_IP; int port; if(argc != 2) { printf("The number of parameter is wrong!\n"); exit(1); } else { //参数为服务器IP des_IP = argv[1]; port = 13; Time(des_IP, port); } exit(0); }