linux c server and client 简单的通信

客官°小女子只卖身不卖艺 2022-08-02 05:42 137阅读 0赞

server.c

\#include <stdlib.h>  
\#include <stdio.h>  
\#include <errno.h>  
\#include <string.h>  
\#include <unistd.h>  
\#include <netdb.h>  
\#include <sys/socket.h>  
\#include <netinet/in.h>  
\#include <sys/types.h>  
\#include <arpa/inet.h>  
  
int main(int argc, char \*argv\[\])  
\{  
int sockfd,new\_fd;  
struct sockaddr\_in server\_addr;  
struct sockaddr\_in client\_addr;  
int sin\_size,portnumber;  
char hello\[1000\]="Hello! Are You Fine?\\n";  
  
if(argc!=2)  
\{  
fprintf(stderr,"Usage:%s portnumber\\a\\n",argv\[0\]);  
exit(1);  
\}  
  
if((portnumber=atoi(argv\[1\]))<0)  
\{  
fprintf(stderr,"Usage:%s portnumber\\a\\n",argv\[0\]);  
exit(1);  
\}  
  
/\* 服务器端开始建立socket描述符 \*/  
if((sockfd=socket(AF\_INET,SOCK\_STREAM,0))==-1)  
\{  
fprintf(stderr,"Socket error:%s\\n\\a",strerror(errno));  
exit(1);  
\}  
  
/\* 服务器端填充 sockaddr结构 \*/  
bzero(&server\_addr,sizeof(struct sockaddr\_in));  
server\_addr.sin\_family=AF\_INET;  
server\_addr.sin\_addr.s\_addr=htonl(INADDR\_ANY);  
server\_addr.sin\_port=htons(portnumber);  
  
/\* 捆绑sockfd描述符 \*/  
if(bind(sockfd,(struct sockaddr \*)(&server\_addr),sizeof(struct sockaddr))==-1)  
\{  
fprintf(stderr,"Bind error:%s\\n\\a",strerror(errno));  
exit(1);  
\}  
  
/\* 监听sockfd描述符 \*/  
if(listen(sockfd,5)==-1)  
\{  
fprintf(stderr,"Listen error:%s\\n\\a",strerror(errno));  
exit(1);  
\}  
  
while(1)  
\{  
/\* 服务器阻塞,直到客户程序建立连接 \*/  
sin\_size=sizeof(struct sockaddr\_in);  
if((new\_fd=accept(sockfd,(struct sockaddr \*)(&client\_addr),&sin\_size))==-1)  
\{  
fprintf(stderr,"Accept error:%s\\n\\a",strerror(errno));  
exit(1);  
\}  
  
fprintf(stderr,"Server get connection from %s\\n",  
inet\_ntoa(client\_addr.sin\_addr));  
  
fscanf(stdin,"%s",hello);  
if(write(new\_fd,hello,strlen(hello))==-1)  
\{  
fprintf(stderr,"Write Error:%s\\n",strerror(errno));  
exit(1);  
\}  
/\* 这个通讯已经结束 \*/  
close(new\_fd);  
/\* 循环下一个 \*/  
\}  
close(sockfd);  
exit(0);  
\}

client.c

\#include <stdlib.h>  
\#include <stdio.h>  
\#include <errno.h>  
\#include <string.h>  
\#include <unistd.h>  
\#include <netdb.h>  
\#include <sys/socket.h>  
\#include <netinet/in.h>  
\#include <sys/types.h>  
\#include <arpa/inet.h>  
  
int main(int argc, char \*argv\[\])  
\{  
int sockfd;  
char buffer\[1024\];  
struct sockaddr\_in server\_addr;  
struct hostent \*host;  
int portnumber,nbytes;  
  
if(argc!=3)  
\{  
fprintf(stderr,"Usage:%s hostname portnumber\\a\\n",argv\[0\]);  
exit(1);  
\}  
  
if((host=gethostbyname(argv\[1\]))==NULL)  
\{  
fprintf(stderr,"Gethostname error\\n");  
exit(1);  
\}  
  
if((portnumber=atoi(argv\[2\]))<0)  
\{  
fprintf(stderr,"Usage:%s hostname portnumber\\a\\n",argv\[0\]);  
exit(1);  
\}  
  
/\* 客户程序开始建立 sockfd描述符 \*/  
if((sockfd=socket(AF\_INET,SOCK\_STREAM,0))==-1)  
\{  
fprintf(stderr,"Socket Error:%s\\a\\n",strerror(errno));  
exit(1);  
\}  
  
/\* 客户程序填充服务端的资料 \*/  
bzero(&server\_addr,sizeof(server\_addr));  
server\_addr.sin\_family=AF\_INET;  
server\_addr.sin\_port=htons(portnumber);  
server\_addr.sin\_addr=\*((struct in\_addr \*)host->h\_addr);  
  
/\* 客户程序发起连接请求 \*/  
if(connect(sockfd,(struct sockaddr \*)(&server\_addr),sizeof(struct sockaddr))==-1)  
\{  
fprintf(stderr,"Connect Error:%s\\a\\n",strerror(errno));  
exit(1);  
\}  
  
/\* 连接成功了 \*/  
if((nbytes=read(sockfd,buffer,1024))==-1)  
\{  
fprintf(stderr,"Read Error:%s\\n",strerror(errno));  
exit(1);  
\}  
buffer\[nbytes\]='\\0';  
printf("I have received:%s\\n",buffer);  
/\* 结束通讯 \*/  
close(sockfd);  
exit(0);  
\}

Makefile

all:server client  
server:server.c  
gcc $^ -o $@  
client:client.c  
gcc $^ -o $@