设计一个Daytime协议的服务器和客户机端程序

#include <iostream> #include <string> #include <WinSock2.h> #pragma comment(lib,"ws2_32.lib") using namespace std; #define PROTOPORT 13 #define QLEN 6 int visits = 0; #define DAY_TIME_DEF_PORT 13 #define DAY_TIME_BUF_SIZE 64 #define DAY_TIME_DEF_COUNT 2 int main(int argc, char* argv[]) { struct hostent* ptrh; struct sockaddr_in servaddr; struct sockaddr_in clientaddr; SOCKET listenfd; SOCKET clientfd; int alen;//地址长度 //char buf[1000]; char buf[DAY_TIME_BUF_SIZE]; //int port; int port = DAY_TIME_DEF_PORT; char* time_str; time_t now_time; WSADATA wsaData; WSAStartup(MAKEWORD(2, 0), &wsaData); memset((char*)&servaddr, 0, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = INADDR_ANY; if (argc > 1) { port = atoi(argv[1]); } else { port = PROTOPORT; } if (port > 0) { servaddr.sin_port = htons((u_short)port); } else { //fprintf(stderr, "bad portnumber %s\n", argv[1]); //exit(1); cout << "bad portnumber %s" << argv[1] << endl; return 1; } listenfd = socket(AF_INET, SOCK_STREAM, 0); if (listenfd == INVALID_SOCKET) { //fprintf(stderr, "socket creation failed\n"); //exit(1); cout << "socket creation failed" << WSAGetLastError() << endl; return 1; } if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) == SOCKET_ERROR) { //fprintf(stderr, "bind failed\n"); //exit(1); cout << "bind failed" << WSAGetLastError() << endl; return 1; } /*开始监听*/ if (listen(listenfd, QLEN) == SOCKET_ERROR) { //fprintf(stderr, "listen failed\n"); //exit(1); cout << "listen failed" << WSAGetLastError() << endl; return 1; } while (1) { alen = sizeof(clientaddr); if ((clientfd = accept(listenfd, (struct sockaddr*)&clientaddr, &alen)) == INVALID_SOCKET) { //fprintf(stderr, "accept failed\n"); //exit(1); cout << "accept failed" << WSAGetLastError() << endl; return 1; } visits++; cout << "当前已有" << visits << "个访问者," << "当前访问者的IP：" << inet_ntoa(clientaddr.sin_addr) << " POST: " << port << endl; //printf(" [Daytime]recv: \"%s\" ,from : %s\r\n", recv_buf, inet_ntoa(clnt_addr.sin_addr)); time_t now_time = time(0); //获取当前系统的日期和时间。 char* time_str = ctime(&now_time);//将某个日期和时间转换为字符串。 sprintf(buf, "this server has been contacted %d time \n", visits); send(clientfd, time_str, strlen(time_str), 0); //sendto(serv_sock, time_str, strlen(time_str), 0, (struct sockaddr*)&clnt_addr, addr_len); closesocket(clientfd); } WSACleanup(); return 0; }