基于华为鲲鹏云服务器CentOS中（或Ubuntu），使用Linux Socket实现：
1. time服务器的客户端服务器，提交程序运行截图
查看IP地址
代码如下：
//timeclient.c
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#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]="学号:20191316";
char str3[MAXLINE]="当地时间:";
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);
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);
}
}
//timeserver.c
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#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 <port>\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(<);
strftime(sbuf,64,"%Y-%m-%d %H:%M:%S",local);
send(connfd,sbuf,MAXLINE,0);
close(connfd);
exit(0);
}
close(connfd);
} }
}
2. echo服务器的客户端服务器，提交程序运行截图，服务器把客户端传进来的内容加入“服务器进程pid 你的学号 姓名 echo :”返回给客户端
可见客户端输入的内容被服务器又返回给客户端了
代码如下
\\echoclient.c
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <string.h>
#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]="服务器进程pid:";
char str2[MAXLINE]="学号姓名:20191316 王秋雨";
char str3[MAXLINE]="echo:";
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);
while(1){
scanf("%[^\n]",sbuf);
send(clientfd,sbuf,MAXLINE,0);
recv(clientfd,rbuf,MAXLINE,0);
printf("%s",str1);
printf("%d\n",getpid());
printf("%s",str2);
putchar('\n');
printf("%s",str3);
puts(rbuf);
close(clientfd);
exit(0);
}
}
//echoserver.c
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <pthread.h>
#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 *thread(void *vargp);
int main(int argc,char **argv){
int listenfd,*connfdp,port;
int clientlen;
struct sockaddr_in clientaddr;
struct hostent *hp;
char *haddrp;
pthread_t tid;
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);
connfdp =malloc(sizeof(int));
*connfdp = 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);
pthread_create(&tid,NULL,thread,connfdp);
pthread_join(tid,NULL);
}
}
void *thread(void *vargp){
time_t lt;
tm *local;
char sbuf[MAXLINE];
char rbuf[MAXLINE];
int connfd = *((int*)vargp);
free(vargp);
pthread_detach(pthread_self());
recv(connfd,rbuf,MAXLINE,0);
printf("The massage is :%s\n",rbuf);
send(connfd,rbuf,MAXLINE,0);
close(connfd);
return NULL;
}
全部代码如下：https://gitee.com/qiu_yu_wang/code/tree/master/socket
3. 服务器部署到华为云服务器，客户端用Ubuntu虚拟机。
由于华为云余额不足，我选择了两个虚拟机来操作
查看虚拟机的IP地址为：192.168.78.128
