tcp_server.c ( File view )

  • By ychao0819 2015-04-09
  • View(s):2
  • Download(s):1
  • Point(s): 0
			#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 argc, char *argv[]) 
{
 
	int sockfd,new_fd; 
	struct sockaddr_in server_addr; 
	struct sockaddr_in client_addr; 
	int sin_size; 
	int nbytes;
	char buffer[1024];
	

	/* 服务器端开始建立sockfd描述符 */ 
	if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) // AF_INET:IPV4;SOCK_STREAM:TCP
	{
 
		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)); // 初始化,置0
	server_addr.sin_family=AF_INET;                 // Internet
	server_addr.sin_addr.s_addr=htonl(INADDR_ANY);  // (将本机器上的long数据转化为网络上的long数据)和任何主机通信  //INADDR_ANY 表示可以接收任意IP地址的数据,即绑定到所有的IP
	//server_addr.sin_addr.s_addr=inet_addr("192.168.1.1");  //用于绑定到一个固定IP,inet_addr用于把数字加格式的ip转化为整形ip
	server_addr.sin_port=htons(portnumber);         // (将本机器上的short数据转化为网络上的short数据)端口号
	
	/* 捆绑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); 
	
} 

	/* 设置允许连接的最大客户端数 */ 
	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)); // 将网络地址转换成.字符串
		
		if((nbytes=read(new_fd,buffer,1024))==-1) 
		{
 
			fprintf(stderr,"Read Error:%s\n",strerror(errno)); 
			exit(1); 
		
} 		
		buffer[nbytes]='\0';
		printf("Server received %s\n",buffer);
		
		/* 这个通讯已经结束 */ 
		close(new_fd); 
		/* 循环下一个 */ 
	
} 

	/* 结束通讯 */ 
	close(sockfd); 
	exit(0); 

} 
			
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