第八周测试课下补交

基于socket 使用教材的csapp.h csapp.c,实现daytime(13)服务器（端口我们使用13+后三位学号）和客户端

服务器响应消息格式是

客户端IP：XXXX

服务器实现者学号：XXXXXXXX

当前时间： XX：XX：XX

上方提交代码

提交一个客户端至少查询三次时间的截图测试截图

提交至少两个客户端查询时间的截图测试截图

• echoclient.c

/*
 * echoclient.c - An echo client
 */
/* $begin echoclientmain */
#include "csapp.h"

int main(int argc, char **argv) 
{
    int clientfd, port;
    char *host, buf[MAXLINE];
    rio_t rio;

    if (argc != 3) {
	fprintf(stderr, "usage: %s <host> <port>\n", argv[0]);
	exit(0);
    }
    host = argv[1];
    port = atoi(argv[2]);

    clientfd = Open_clientfd(host, port);
    Rio_readinitb(&rio, clientfd);

    while (Fgets(buf, MAXLINE, stdin) != NULL) {
	Rio_writen(clientfd, buf, strlen(buf));
	Rio_readlineb(&rio, buf, MAXLINE);
	Fputs(buf, stdout);
    }
    Close(clientfd); //line:netp:echoclient:close
    exit(0);
}
/* $end echoclientmain */

• echoserveri.c

/*
 * echoserveri.c - An iterative echo server
 */
/* $begin echoserverimain */
#include "csapp.h"

void echo(int connfd);

int main(int argc, char **argv)
{
    int listenfd, connfd, port, clientlen;
    struct sockaddr_in clientaddr;
    struct hostent *hp;
    char *haddrp;
    if (argc != 2) {
	fprintf(stderr, "usage: %s <port>\n", argv[0]);
	exit(0);
    }
    port = atoi(argv[1]);

    listenfd = Open_listenfd(port);
    while (1) {
	clientlen = sizeof(clientaddr);
	connfd = Accept(listenfd, (SA *)&clientaddr, &clientlen);

	/* determine the domain name and IP address of the client */
	hp = Gethostbyaddr((const char *)&clientaddr.sin_addr.s_addr,
			   sizeof(clientaddr.sin_addr.s_addr), AF_INET);
	haddrp = inet_ntoa(clientaddr.sin_addr);
	printf("server connected to %s (%s)\n", hp->h_name, haddrp);

	echo(connfd);
	Close(connfd);
    }
    exit(0);
}
/*
 * echo - read and echo text lines until client closes connection
 */
/* $begin echo */
#include "csapp.h"

void echo(int connfd)
{
time_t t;
    struct tm * lt;
	size_t n;
    char buf[MAXLINE];
    rio_t rio;

    Rio_readinitb(&rio, connfd);
    while((n = Rio_readlineb(&rio, buf, MAXLINE)) != 0) { //line:netp:echo:eof
	 printf("server received %d bytes\n", n);
    printf("服务器实现者学号：20175206\n");
    time (&t);
    lt = gmtime (&t);
    printf ("当前时间为：%d/%d/%d %d:%d:%d\n",lt->tm_year+1900, lt->tm_mon+1, lt->tm_mday, lt->tm_hour, lt->tm_min, lt->tm_sec);
	Rio_writen(connfd, buf, n);
    }
}
/* $end echo */
/* $end echoserverimain */

• 单客户端多发
  
  

• 多客户端多发
  

• ps注意事项：
  要使用以下的代码进行线程编译
  gcc echoserveri.c -o server -lpthread
gcc echoclient.c -o client -lpthread
  运行时输入13+学号后三位
  ./server 13206
./client 127.0.0.1 13206

电脑在课上没电了，于是在课下进行补交。