fileclient.c~

FTP的客户端与主机端程序源码

/*客户端，即要下载文件的机子端程序*/
/*****************************FileClient.c********************************/
#include<stdio.h>
#include<sys/types.h>
#include<stdlib.h>
#include<sys/fcntl.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#define command "clear"

#include<errno.h>
#include <string.h>

#define BUFFER_SIZE 4096
#define NAME_SIZE 200
#define SERVER_PORT 1810

int main(int argc,int *argv[])
{
   char buf[BUFFER_SIZE] ={0},file[NAME_SIZE]={0};
   int target,ret;
   register int bytes,sockfd;
   struct sockaddr_in sin ;
   struct hostent *hp;
	long long filesize;
	unsigned int filenum;
	if(argc<2)
	{
		fprintf(stderr,"Please enter the server's hostIP!\n");
		exit(1);
	}
   system(command);
	//printf("the host name is:%s\n",argv[1]);
	/*if((hp=gethostbyname(argv[1]))==NULL)
	{
		fprintf(stderr, "返回服务器地址信息错!!!\n");
		exit(1);
	}*/
   while((hp=gethostbyname(argv[1]))!=NULL)
{
if((sockfd = socket(AF_INET, SOCK_STREAM, 0 )) < 0)
        {
      fprintf(stderr, "获取SOCKET号失败!!!\n");
      exit(2);
        }
   // memset((char*)&sin, '\0', sizeof(sin));
   sin.sin_family = AF_INET;
   sin.sin_port = htons(SERVER_PORT);
   sin.sin_addr =*(struct in_addr*)hp->h_addr;
	//printf("the s_addr is:%d\n",sin.sin_addr.s_addr);
	bzero(&(sin.sin_zero),8);

/*连接到服务器*/
   if((ret = connect(sockfd, (struct sockaddr*)&sin, sizeof(sin))) == -1)
        {
      fprintf(stderr, "不能与服务器连接!!!\n");
      exit(3);
        }
   memset(buf, 0, BUFFER_SIZE);
   while(read(sockfd, file, sizeof(file)) < 0);       
   sprintf(buf, "%s_%s", "receive", file);

   if((target=open(buf, O_WRONLY|O_CREAT|O_TRUNC,0644)) < 0)
        {
      perror("不能打开目标文件!!");
      exit(4);
        }
       
   memset(buf, 0, BUFFER_SIZE);
   while((bytes = read(sockfd, buf, sizeof(buf))) > 0)
        {
      write(target,buf,bytes);
      memset(buf, 0, BUFFER_SIZE);
        }
   printf("接收文件成功!!!\n");
   close(target);
   close(sockfd);
}


  while((hp=gethostbyname(argv[1]))!=NULL)
{
if((sockfd = socket(AF_INET, SOCK_STREAM, 0 )) < 0)
        {
      fprintf(stderr, "获取SOCKET号失败!!!\n");
      exit(2);
        }
   // memset((char*)&sin, '\0', sizeof(sin));
   sin.sin_family = AF_INET;
   sin.sin_port = htons(SERVER_PORT);
   sin.sin_addr =*(struct in_addr*)hp->h_addr;
	//printf("the s_addr is:%d\n",sin.sin_addr.s_addr);
	bzero(&(sin.sin_zero),8);

/*连接到服务器*/
   if((ret = connect(sockfd, (struct sockaddr*)&sin, sizeof(sin))) == -1)
        {
      fprintf(stderr, "不能与服务器连接!!!\n");
      exit(3);
        }
   memset(buf, 0, BUFFER_SIZE);
   while(read(sockfd, filesize, sizeof(long long)) < 0);
	while(read(sockfd, filenum, sizeof(unsigned int))<0);       
	printf("the filesize is:%ld\n",filesize);
	printf("the filenum	is:%d\n",filenum);
	close(sockfd);
}
}