server.c

设计服务器和客户端

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <pthread.h>
#define SERVPORT 3333
#define BACKLOG 10
#define MAX_CONNECTED_NO 10
#define MAXDATASIZE 80

int main()
{
	struct sockaddr_in server_sockaddr,client_sockaddr;
	int sin_size,recvbytes;
	int sockfd,client_fd,c_client_fd;
	int ffd;
	int i;
	int ret;
	char recvbuf[MAXDATASIZE];
	char buf[MAXDATASIZE];
	
	if((sockfd = socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket");
		exit(1);
	}
	printf("socket success!,sockfd=%d\n",sockfd);
	
	server_sockaddr.sin_family=AF_INET;
	server_sockaddr.sin_port=htons(SERVPORT);
	server_sockaddr.sin_addr.s_addr=INADDR_ANY;
	bzero(&(server_sockaddr.sin_zero),8);
	
	if(bind(sockfd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr))==-1)
	{
		perror("bind");
		exit(1);
	}
	printf("bind success!\n");
	
	if(listen(sockfd,BACKLOG)==-1)
	{
		perror("listen");
		exit(1);
	}
	printf("listening....\n");
	
	if((client_fd=accept(sockfd,(struct sockaddr *)&client_sockaddr,&sin_size))==-1)
	{
		perror("accept");
		exit(1);
	}
	
	c_client_fd=client_fd;
	
	if((recvbytes=recv(client_fd,recvbuf,MAXDATASIZE,0))==-1)
	{
		perror("recv");
		exit(1);
	}
 	//printf("received a connection :%s\n",recvbuf);
	
	for(i=strlen(recvbuf);i>=0;i--)
	{
		recvbuf[i+2]=recvbuf[i];
	}
	recvbuf[0]='.';
	recvbuf[1]='/';
 	//printf("received a connection :%s\n",recvbuf);
	
	ffd=open(recvbuf,O_RDONLY|O_EXCL,0400);
	if(ffd==-1)
	{	
		ret=send(client_fd,"file not exsit",15,0);
		printf("no file\n");
		if(ret==-1)
		{
			perror("send");
			exit(1);
		}
		return 0;
	}
	while(read(ffd,buf,80))
	{
		ret=send(c_client_fd,buf,sizeof(buf),0);
		if(ret==-1)
		{
			perror("send file");
			exit(1);
		}
		memset(buf,0,sizeof(buf));
	}
	close(ffd);
	printf("file tansferred!\n");
	close(sockfd);
	return 0;
}