socket测试-3（必做）

任务详情：

基于socket 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

实践过程

代码

展开查看csapp.c

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
define MAXLINE 100
typedef struct sockaddr SA;
define LISTENQ 1024
define EINTR 4
define RIO_BUFSIZE 8192
typedef struct{
int rio_fd;

int rio_cnt;

char *rio_bufptr;

char rio_buf[RIO_BUFSIZE];

}rio_t;
int open_listenfd(int port){
int listenfd,optval=1;

struct sockaddr_in serveraddr;
if((listenfd = socket(AF_INET,SOCK_STREAM,0))<0)

return -1;
if(setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,

(const void*)&optval,sizeof(int))<0)

return -1;
bzero((char )&serveraddr,sizeof(serveraddr));

serveraddr.sin_family = AF_INET;

serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);

serveraddr.sin_port = htons((unsigned short)port);

if(bind(listenfd,(SA)&serveraddr,sizeof(serveraddr))<0)

return -1;
if(listen(listenfd,LISTENQ)<0)

return -1;
return listenfd;

}
int open_clientfd(char *hostname,int port){
int clientfd;

struct hostent *hp;

struct sockaddr_in serveraddr;
if((clientfd = socket(AF_INET,SOCK_STREAM,0))<0)

return -1;
if((hp = gethostbyname(hostname))==NULL)

return -2;
bzero((char *)&serveraddr,sizeof(serveraddr));

serveraddr.sin_family = AF_INET;

bcopy((char *)hp->h_addr_list[0],

(char *)&serveraddr.sin_addr.s_addr,hp->h_length);

serveraddr.sin_port = htons(port);
if(connect(clientfd,(SA *)&serveraddr,sizeof(serveraddr))<0)

return -1;
return clientfd;

}
ssize_t rio_writen(int fd, void *usrbuf,size_t n){
size_t nleft = n;

ssize_t nwritten;

char *bufp = usrbuf;
while(nleft>0){
if((nwritten = write(fd,bufp,nleft))<=0){
if((nwritten = write(fd,bufp,nleft))<=0){
if(errno == EINTR)

nwritten = 0;

else

return -1;

}

nleft -= nwritten;

bufp += nwritten;

}

}

return n;

}
void rio_readinitb(rio_t *rp,int fd){
rp->rio_fd = fd;

rp->rio_cnt = 0;

rp->rio_bufptr = rp->rio_buf;

}
ssize_t rio_read(rio_t *rp,char *usrbuf,size_t n){
int cnt;
while(rp->rio_cnt <=0){
rp->rio_cnt = read(rp->rio_fd,rp->rio_buf,sizeof(rp->rio_buf));
if(rp->rio_cnt<0){
if(errno!=EINTR)

return -1;

}

else if(rp->rio_cnt==0)

return 0;

else

rp->rio_bufptr = rp->rio_buf;

}
cnt = n;

if(rp->rio_cnt < n)

cnt = rp->rio_cnt;

memcpy(usrbuf,rp->rio_bufptr,cnt);

rp->rio_bufptr += cnt;

rp->rio_cnt -= cnt;

return cnt;

}
ssize_t rio_readlineb(rio_t *rp,void *usrbuf,size_t maxlen){
int n,rc;

char c,*bufp = usrbuf;
for(n=1;n<maxlen;n++){
if((rc = rio_read(rp,&c,1))==1){
*bufp++ = c;

if(c'\n')

break;

}else if(rc0){
if(n==1)

return 0;

else

break;

}else

return -1;

}
*bufp = 0;

return n;

}
void echo(int connfd){
size_t n;

char buf[MAXLINE];

rio_t rio;
rio_readinitb(&rio,connfd);

while((n = rio_readlineb(&rio,buf,MAXLINE))!=0){
printf("server received %d bytes\n",n);
rio_writen(connfd,buf,n);

}

}

展开查看服务器端代码

#include 
#include 
#include                                                                    
#include 
#include     
#include 
#include 
#include 
#include 
#include 
#include 
define MAXLINE 200
define RIO_BUFSIZE 8192
typedef struct{

int rio_fd;

int rio_cnt;

char *rio_bufptr;

char rio_buf[RIO_BUFSIZE];
}rio_t;
typedef struct sockaddr SA;
typedef struct{

int tm_sec;

int tm_min;

int tm_hour;

int tm_mday;

int tm_mon;

int tm_year;

int tm_wday;

int tm_yday;

int tm_isdst;

}tm;
void sigchld_handler(int sig){
pid_t pid;

int stat;
while((pid = waitpid(-1,&stat,WNOHANG))>0){

printf("child %d terminated\n",pid);

}

return;

}
int main(int argc,char **argv){
int listenfd,connfd,port,clientlen;

struct sockaddr_in clientaddr;

struct hostent *hp;

char *haddrp;

char sbuf[MAXLINE];

char rbuf[MAXLINE];

rio_t rio;

time_t lt;

tm *local;

char str1[MAXLINE]="客户端IP:";

char str2[MAXLINE]="服务器实现者学号:";

char str3[MAXLINE]="当地时间:";
if(argc != 2){
fprintf(stderr,"usage:%s \n",argv[0]);

exit(0);

}

port = atoi(argv[1]);

signal(SIGCHLD,sigchld_handler);

listenfd = open_listenfd(port);

while(1){
clientlen = sizeof(clientaddr);

connfd = accept(listenfd,(SA )&clientaddr,&clientlen);

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);

if(fork() == 0){

close(listenfd);

lt = time(NULL);

local = localtime(&lt);

strftime(sbuf,64,"%Y-%m-%d %H:%M:%S",local);

send(connfd,sbuf,MAXLINE,0);

close(connfd);

exit(0);

}

close(connfd);

}

}

展开查看客户端代码

#include 
#include                                                                    
#include 
#include     
#include 
#include 
#include 
#include 
define RIO_BUFSIZE 8192
typedef struct{

int rio_fd;

int rio_cnt;

char *rio_bufptr;

char rio_buf[RIO_BUFSIZE];
}rio_t;
define MAXLINE 200
int main(int argc,char **argv){
int clientfd,port;

char *host,buf[MAXLINE];

char sbuf[MAXLINE];

char rbuf[MAXLINE];

rio_t rio;

char str1[MAXLINE]="客户端IP:";

char str2[MAXLINE]="服务器实现者学号:20191329";
char str3[MAXLINE]="当地时间:";
if(argc!=3){
fprintf(stderr,"usage:%s  \n",argv[0]);

exit(0);

}

host = argv[1];

port = atoi(argv[2]);
clientfd = open_clientfd(host,port);
while(1){
recv(clientfd,rbuf,MAXLINE,0);
printf("%s",str1);

puts(host);
printf("%s",str2);

putchar('\n');
printf("%s",str3);
puts(rbuf);
close(clientfd);
exit(0);

}

}

一个客户端查询多次

使用gcc csapp.c filename.c -o name对客户端和服务器代码进行编译

• 客户端
  

• 服务器端
  

至少两个客户端查询