TFTP搭建的下载与上传
1. 将UDP服务器客户端脱离笔记重新搭建（上交）
2. 完成下载上传（上交，必须完成下载，上传尽力完成）
TFTP下载
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg) do{fprintf(stderr,"line:%d",__LINE__);perror(msg);}while(0)
#define TFTP_SER_PORT 69
#define SER_IP "192.168.0.144"
int main(int argc, const char *argv[])
{
//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 create success cfd = %d __%d__\n",cfd,__LINE__);
//填充服务器地址信息
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(TFTP_SER_PORT);//端口号
sin.sin_addr.s_addr = inet_addr(SER_IP);//TFTP地址
//发送下载请求
char buf[516] = "";
bzero(buf,sizeof(buf));
unsigned short * p1 = (unsigned short *)buf;
*p1 = htons(1); //操作码
char *p2 = buf + 2;
char filename[1024]="";
printf("输入要下载的文件名>>>>>");
scanf("%s",filename);
getchar();
strcpy(p2,filename); //下载的文件
char *p3 = p2 + strlen(p2);
*p3 = 0;
char *p4 = p3 + 1;
strcpy(p4,"octet");
char *p5 = p4 + strlen(p4);
int size = 2+1+1+strlen(p2)+strlen(p4);
//常用组包
// int size = sprintf(buf,"%c%c %s%c%s%c",0x00,0x01,"1_armcli.c",0,"octet",0);
ssize_t ret = sendto(cfd,buf,size,0,(struct sockaddr *)&sin,sizeof(sin));
if(ret < 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");
socklen_t addrlen = sizeof(sin);
//打开文件
int fd;
ssize_t recv_len;
ssize_t res = 0;
// unsigned short num = 0;
while(1)
{
//接收服务器发送的数据包
bzero(buf,sizeof(buf));
recv_len = recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr *)&sin,&addrlen);
if(recv_len < 0)
{
ERR_MSG("recvfrom");
return -1;
}
printf("recvfrom success\n");
//错误包，打印错误码+错误信，退出
if(buf[1] == 0x05)
{
fprintf(stderr,"download failed __%d__%s\n",ntohs(*(short *)(buf + 2)),buf + 4);
break;
}
//是数据包，提取数据包中的数据（buf+4），另存文件当中
else if(buf[1] == 0x03)
{
printf("get file\n");
fd = open(filename,O_WRONLY | O_CREAT | O_APPEND,0666);
if(fd < 0)
{
ERR_MSG("open");
return -1;
}
//给服务器回复ACK，组ACK包，快编号域接收到的数据包快编号一致
if(write(fd,buf+4,recv_len-4)<0)
{
ERR_MSG("write");
ret = -1;
break;
}
printf("write success\n");
buf[1] == 0x04;
if(sendto(cfd,buf,4,0,(struct sockaddr *)&sin,sizeof(sin) )< 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");
if(recv_len < 512)
break;
close(fd);
}
}
printf("dowload compare\n");
//关闭
close(cfd);
return 0;
} 服务器
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg) do{fprintf(stderr,"line:%d",__LINE__);perror(msg);}while(0)
#define PORT 1052
#define IP "192.168.0.119"
int main(int argc, const char *argv[])
{
//创建报式套接字
int sfd = socket(AF_INET,SOCK_DGRAM,0);
if(sfd < 0)
{
ERR_MSG("socket");
return -1;
}
printf("socket create success sfd = %d __%d__\n",sfd,__LINE__);
//填充服务器地址信息
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(PORT);//端口号
sin.sin_addr.s_addr = inet_addr(IP);//IP地址
//绑定
if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin))<0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success sfd = __%d__\n",__LINE__);
char buf[1024] = "";
ssize_t res = 0;
struct sockaddr_in cin;
socklen_t addrlen = sizeof(cin);
while(1)
{
bzero(buf,sizeof(buf));//清空
//接收
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
strcat(buf,"=_=");
if(sendto(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,sizeof(cin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
printf("sendto success\n");
}
//关闭
close(sfd);
return 0;
}
客户端
#include
#include
#include
#include
#include
#include
#include
#define ERR_MSG(msg) do{fprintf(stderr,"line:%d",__LINE__);perror(msg);}while(0)
#define SER_PORT 1053
#define SER_IP "192.168.0.119"
#define CLI_PORT 1053
#define CLI_IP "192.168.0.119"
int main(int argc, const char *argv[])
{
//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 create success cfd = %d __%d__\n",cfd,__LINE__);
//填充服务器地址信息
struct sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(SER_PORT);//端口号
sin.sin_addr.s_addr = inet_addr(SER_IP);//IP地址
//绑定
struct sockaddr_in cin;
sin.sin_family = AF_INET;
sin.sin_port = htons(CLI_PORT);//端口号
sin.sin_addr.s_addr = inet_addr(CLI_IP);//IP地址
if(bind(cfd,(struct sockaddr *)&sin,sizeof(sin))<0)
{
ERR_MSG("bind");
return -1;
}
printf("bind success sfd = __%d__\n",__LINE__);
char buf[1024] = "";
ssize_t res = 0;
struct sockaddr_in recvaddr;
socklen_t addrlen = sizeof(recvaddr);
while(1)
{
bzero(buf,sizeof(buf));//清空
//发送
printf("Input>>>>");
fgets(buf,sizeof(buf),stdin);
buf[strlen(buf)-1] = '\0';
if(sendto(cfd,buf,sizeof(buf),0,(struct sockaddr *)&sin,sizeof(sin)) < 0)
{
ERR_MSG("sendto");
return -1;
}
//接收数据
bzero(buf,sizeof(buf));
res = recvfrom(cfd,buf,sizeof(buf),0,(struct sockaddr *)&recvaddr,&addrlen);
if(res < 0)
{
ERR_MSG("recvfrom");
return -1;
}
printf("[ %s : %d ]:%s\n",inet_ntoa(recvaddr.sin_addr),ntohs(recvaddr.sin_port),buf);
}
//关闭
close(cfd);
return 0;
}