day4TRTP上传

思维导图

TFTP数据上传

#include <stdio.h>
#include<string.h>
#include<stdlib.h>
#include<head.h>

#define SER_IP "192.168.125.149"
#define SER_PORT 69

int main(int argc, const char *argv[])
{
	int fd=open("./1_armcli.c",O_RDONLY);
	if(fd<0)
	{
		perror("fd");
		return -1;
	}
	//套接字通信

	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd==-1)
	{
		perror("sfd");
		return -1;
	}

	//服务器端口，ip
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(SER_PORT);
	sin.sin_addr.s_addr=inet_addr(SER_IP);
	
	socklen_t socklen=sizeof(sin);
	//不绑定
	//装载读写请求
	char buf[516];

	short *p1=(short*)buf;
	*p1=htons(2);    		//读请求

	char *p2=buf+2;
	strcpy(p2,"1_armcli.c");

	char *p3=p2+strlen(p2)+1;
	strcpy(p3,"octet");

	int len = 4+strlen(p2)+strlen(p3);


	//发送请求
	sendto(sfd,buf,len,0,(struct sockaddr*)&sin,len);

	//数据包初始化
	bzero(buf,sizeof(buf));	
	buf[0]=0x00;
	buf[1]=0x03;

	int num=0;	
	char ack[4];
		while(1)
	{
		//ack
		recvfrom(sfd,ack,sizeof(ack),0,(struct sockaddr*)&sin,&socklen);

		//数据包快编号设置
		buf[2]=ack[2];
		buf[3]=ack[3]+1;

	
		//上传数据
		num=read(fd,buf+4,sizeof(buf)-4);
		
	
		printf("%d\n",num);
	
		sendto(sfd,buf,num+4,0,(struct sockaddr*)&sin,sizeof(sin));
		perror("send");
		if(num==0)
		{

			break;

		}
	}

	//关闭文件
	close(sfd);	

	return 0;
}