fttp项目下载和上传

UDP的服务端

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg)do{\
fprintf(stderr,"line%d\n",__LINE__);\
	perror(msg);\
}while(0)
#define SER_PORT 1234
#define SER_IP "192.168.31.107"//虚拟机ip
int main(int argc, const char *argv[])
{
   //创建报式套接字socket
    int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0)
	{
	ERR_MSG("socket");
	return -1;
	}
    //bind ip和端口号
	 struct sockaddr_in sin;
	 sin.sin_family=AF_INET;
	 sin.sin_port =htons(SER_PORT);
     sin.sin_addr.s_addr=inet_addr(SER_IP);
	 

       if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0)
	   {
	   ERR_MSG("bind");
	   return -1;
	   }
	   printf("bind success__%d__\n",__LINE__);
	   char buf[128]="";
	   ssize_t res=0;
	   struct  sockaddr_in cin;//数据包从谁那里来
	   socklen_t addrlen =sizeof(cin);
	   while(1)
	   {
	   bzero(buf,sizeof(buf));//清空
	   //接收数据recvfrom
	    res=recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
	   if(res<0)
	   {
	   ERR_MSG("recvfrom");
	   return -1;
	   }
	   printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
	   //发送sendto
	   strcat(buf,"*-*");
	   if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,sizeof(cin))<0)
	   {
	   ERR_MSG("sento");
	   return -1;
	   }
	    printf("sendto success\n");
	   }
	   //关闭套接字
	   close(sfd);
	return 0;
}

UDP的客户端

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg)do{\
fprintf(stderr,"lin%d\n",__LINE__);\
perror(msg);\
}while(0)
#define SER_PORT 1234
#define SER_IP  "192.168.31.107"
int main(int argc, const char *argv[])
{
    //创建套接字
	int cfd=socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0)
	{
	ERR_MSG("socket");
	return -1;
	}
    //bind,非必要绑定
	//填充服务器的地址信息结构体,给下面的sendto函数使用
	 struct sockaddr_in sin;
	 sin.sin_family =AF_INET;
	 sin.sin_port =htons(SER_PORT);
	 sin.sin_addr.s_addr=inet_addr(SER_IP);
	
	 char buf[128]="";
	 ssize_t res=0;
	 struct sockaddr_in cin;//存储数据包到哪里去
	 socklen_t addrlen=sizeof(cin);
	 while(1)
	 {
	 bzero(buf,sizeof(buf));
	 //发送数据sendto
	 printf("请输入");
	 fgets(buf,sizeof(buf),stdin);
	 buf[strlen(buf)-1]=0;
	 
	   //sendto将数据发送到服务器，所以需要填充服务器的地址信息结构体
	   if(sendto(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,sizeof(sin))<0)
	   {
	   ERR_MSG("sendto");
	   return -1;
	   }
	    printf("sendto success\n");
		bzero(buf,sizeof(buf));
		res=recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,&addrlen);
		if(res<0)
		{
		ERR_MSG("recvfrom");
		return -1;
		}
        printf("%s\n",buf);
	 }
	 //关闭套接字
	  close(cfd);
	return 0;
}

FTTP的下载

#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg)do{\
	fprintf(stderr,"line:%d\n",__LINE__);\
	perror(msg);\
}while(0)
#define SER_PORT 69
#define SER_IP "192.168.31.195"
int  download_cli(char filename[])
{
	//创建报式套接字
	int cfd= socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0)
	{
		ERR_MSG("socket");
		return -1;

	}
	printf("socket suceess=%d__%d__\n",cfd,__LINE__);

	/*//填充服务器的地址信息结构体，绑定到套接字上 给下面的sendto使用*/
	struct sockaddr_in sin;
	sin.sin_family =AF_INET;
	sin.sin_port   =htons(SER_PORT);
	sin.sin_addr.s_addr=inet_addr(SER_IP);//tftp服务器所在的ip
	socklen_t addrlen=sizeof(sin);
	//发送下载请求协议
   	char buf[516]={0};
	short* p1=(short *)buf;
	*p1=htons(1);//操作码
	char* p2=buf+2;
	strcpy(p2,filename);//要下载的文件名
	char* p3=p2+strlen(p2);
	*p3=0;
	char* p4=p3+1;
	strcpy(p4,"octet");//模式
	char* p5=strlen(p4)+p4;
	*p5=0;
	int size=4+strlen(p2)+strlen(p4);
	if(sendto(cfd,buf,size,0,(struct sockaddr*)&sin,sizeof(sin))<0)
	{
		ERR_MSG ("send");
		return -1;
	}
	printf("发送成功\n");
	//打开文件
	int fd=open(filename,O_WRONLY|O_CREAT|O_TRUNC,0666);//只写
	if(fd<0)
	{
		ERR_MSG("open");
		return -1;
	}
	char buf2[128]="";
	ssize_t res;

	while(1){
		//接受服务器发送的数据包、
		//提取数据包中的数据（buf+4）,另存到文件里
		//给服务器回复ack，组ACK包,快编号与接收到的数据包的快编号一致
		//如果收到回复的是错误包，则打印错误码+错误信息，退出
		bzero(buf,sizeof(buf));
		res =recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr*)&sin,&addrlen);
		if(res<0)
		{
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("len:%ld\n",res);
		//判断操作码是否是ERR
		if(buf[1]==0x03)
		{
			printf("正在写入文件\n");
			//写入文件
			char *p=buf+4;
			write(fd,p,res-4);
			/* {*/
			/*ERR_MSG("write");*/
			/*return -1;*/
			/*}*/
		}
		//发送应答包
		int size=sprintf(buf2,"%c%c%c%c",0x00,0x04,buf[2],buf[3]);
		printf("端口号 %d\n",sin.sin_port);
		if(sendto(cfd,buf2,size,0,(struct sockaddr*)&sin,sizeof(sin))<0)
		{
			ERR_MSG("snedto");
			return -1;
		}
		if(res-4<512)
		{
			printf("下载成功\n");
			return 0;
		}

		printf("[%s :%d]:%s\n",inet_ntoa(sin.sin_addr),ntohs(sin.sin_port),buf);
	}
	//关闭套接字
	close(cfd);
	close(fd);



}

int uploading_cli(char filename[])//上传
{
	//创建报式套接字
	int cfd= socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0)
	{
		ERR_MSG("socket");
		return -1;

	}
	printf("socket suceess=%d__%d__\n",cfd,__LINE__);
	
	struct sockaddr_in sin;
	sin.sin_family =AF_INET;
	sin.sin_port   =htons(SER_PORT);
	sin.sin_addr.s_addr=inet_addr(SER_IP);//tftp服务器所在的ip
	

	//向这服务器发送上传请求
		char buf[516] = "";
       memset(buf,0,sizeof(buf));
		int size = sprintf(buf,"%c%c%s%c%s%c",0x00,0x02,filename,0,"octet",0);
		if(sendto(cfd,buf,size,0,(struct sockaddr *)&sin,sizeof(sin)) < 0){
			ERR_MSG("sendto");
			return -1;
		}
		printf("sendto success\n");

		struct sockaddr_in ser_sin;//ser_sin表示服务器回复时的IP和随机端口
		socklen_t addrlen = sizeof(ser_sin);
		ssize_t res = 0;
		int size_ACK = 0;		
	    int fd = open(filename,O_RDONLY,0666);
		char r_buf[512] = "";
		int read_res = 0;
		char buf_ACK[4] = "";
	                         
		while(1){
			//接受服务器回复的ACK包
			memset(buf_ACK,0,sizeof(buf_ACK));
			memset(buf,0,sizeof(buf));
			res = recvfrom(cfd,buf_ACK,sizeof(buf_ACK),0,(struct sockaddr *)&ser_sin,&addrlen);
			if(res < 0){
				ERR_MSG("recvfrom");
				return -1;
			}
			printf("[%s:%d]\n",inet_ntoa(ser_sin.sin_addr),ntohs(ser_sin.sin_port));
			printf("%d%d%d%d\n",buf_ACK[0],buf_ACK[1],buf_ACK[2],buf_ACK[3]);
			//根据服务器回复的ACK包封装数据包
			buf_ACK[1] = 0x03;
			buf_ACK[3] = buf_ACK[3]+1;
			buf[0] = buf_ACK[0];
			buf[1] = buf_ACK[1];
			buf[2] = buf_ACK[2];
			buf[3] = buf_ACK[3];
			char *p = buf+4;
			read_res = read(fd,r_buf,sizeof(r_buf));	
			strcat(p,r_buf);
			printf("buf =%ld\n",sizeof(buf));
			if(sendto(cfd,buf,read_res+4,0,(struct sockaddr *)&ser_sin,sizeof(ser_sin)) < 0){
				ERR_MSG("sendto");
				return -1;
			}
			printf("sendto success\n");
			if(read_res < 512){
				break;
			}
		}	
	//关闭套接字
	close(cfd);


}
int main (int argc, const char *argv[])
{
	printf("--------请输入你要执行的操作-------\n");
	printf("---------1下载--------------\n");
	printf("----------2上传--------------\n");
	int flag=0;
	char filename[20]={0};
	scanf("%d",&flag);
	if(flag!=1&&flag!=2)
	{
		printf("请重新输入\n");
		return -1;
	}else if(flag==1)//下载
	{
		printf("请输入你要下载的文件\n");
		scanf("%s",filename);
		download_cli(filename); //封装下载函数
	}else if(flag==2)//上传
	{
		printf("请输入你要上传的文件\n");
		scanf("%s",filename);
		uploading_cli(filename); //封装上传函数
	}

	return 0;
}