/*tcp_server.c*/
#include<stdlib.h>
#include<stdio.h>
#include<errno.h>
#include<string.h>
#include<netdb.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<sys/socket.h>
#define portnumber 3333
int main()
{
int sockfd,new_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int nbytes;
char buffer[1024];
/*服務器端開始創建套接字描述符*/
if((sockfd=socket(AF_INET,SOCK_STREAM,0))<0)
{
fprintf(stderr,"socket error:%s\n\a",strerror(errno));
exit(1);
}
/*服務器端填充sockaddr結構*/
bzero(&server_addr,sizeof(struct sockaddr_in));/*初始化,置0*/
server_addr.sin_family=AF_INET;//IPv4
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);//服務器程序可以運行在任何ip的主機上
//server_addr.sin_addr.s_addr=inet_addr("192.168.1.1");
server_addr.sin_port=htons(portnumber);
/*捆綁sockfd描述符到ip地址*/
if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)
{
fprintf(stderr,"bind error:%s\n\a",strerror(errno));
exit(1);
}
/*設置允許連接的最大客戶數*/
if(listen(sockfd,5)==-1)
{
fprintf(stderr,"listen error:%s\n\a",strerror(errno));
exit(1);
}
while(1)
{
/*服務器阻塞,直到客戶程序建立連接*/
sin_size=sizeof(struct sockaddr_in);
if(new_fd=accept(sockfd,(struct sockaddr*)(&client_addr),&sin_size)==-1)
{
fprintf(stderr,"server error:%s\n\a",strerror(errno));
exit(1);
}
fprintf(stderr,"server get connecttion from %s\n",inet_ntoa(client_addr.sin_addr));
if((nbytes=read(new_fd,buffer,1024))==-1)
{
fprintf(stderr,"read error:5s\n",strerror(errno));
exit(1);
}
buffer[nbytes]='\0';
printf("server received %s\n",buffer);
/*這個通訊已經結束*/
close(new_fd);
/*循環下一個*/
}
/*結束通訊*/
close(sockfd);
exit(0);
}