//下载的实现函数
int ftp_download(int control_sockfd)
{
int pasv_or_port;// 定义the ftp协议的两种不同工作mode
int recvbytes,sendbytes;
char sendline[1024],recvline[1024];
struct sockaddr_in serv_addr;
FILE *fd;
int i,j;
int data_sockfd;
//rest
ftp_rest(control_sockfd);
//type
zeromery(recvline,1024);
zeromery(sendline,1024);
strcat(sendline,"TYPE ");
strcat(sendline,"I");
strcat(sendline,"\r\n");
sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
if(sendbytes<0)
{
printf(" type send is error!\n");
}
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(strncmp(recvline,"200",3)==0)
{
printf("使用二进制传输数据\n");
}
else
{
printf("type recv is error!\n");
}
if(npsupport==1)
{
//open the file
int size;
char localpathname[60];//预打开的文件路径字符串
int flags;
char pathname[60];
unsigned int mode;
//用户来选择pasv 或者是 port mode
char selectdata_mode_tran[1024];
zeromery(selectdata_mode_tran,1024);
zeromery(sendline,1024);
zeromery(recvline,1024);
pasv_or_port=0;//(默认是pasv模式)
//pasv mode
if(pasv_or_port==0)
{
strcat(sendline,"PASV");
strcat(sendline,"\r\n");
sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
if(sendbytes<0)
{
printf("pasv send is error!\n");
}
zeromery(recvline,1024);
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(recvbytes<0)
{
printf("pasv recv is error!\n");
}
if(strncmp(recvline,"227",3)==0)
{
char buf[55];
snprintf(buf,51,">>> %s\n",recvline);
printf("%s\n",buf);
}
else
{
printf("pasv recv is error!\n");
}
//处理ftp server 端口
char *ptr1,*ptr2;
char num[1024];
zeromery(num,1024);
//取低位字节
ptr1=recvline+strlen(recvline);
while(*(ptr1)!=')')
{
ptr1--;
}
ptr2=ptr1;
while(*(ptr2)!=',')
ptr2--;
strncpy(num,ptr2+1,ptr1-ptr2-1);
i=atoi(num);//将字符串转换成整数
//取高位字节
zeromery(num,1024);
ptr1=ptr2;
ptr2--;
while(*(ptr2)!=',')
ptr2--;
strncpy(num,ptr2+1,ptr1-ptr2-1);
j=atoi(num);
//初始化服务器数据连接时的端口信息
int data_serviceport;
data_serviceport=j*256+i;
data_sockfd=socket(AF_INET,SOCK_STREAM,0);
serv_addr.sin_family=AF_INET;
serv_addr.sin_addr.s_addr=INADDR_ANY;
serv_addr.sin_port=htons(data_serviceport);
if(connect(data_sockfd,(struct sockaddr*)&serv_addr,sizeof(struct sockaddr))==-1)
{
printf("pasv data connect is error!\n");
}
printf("remote-file-pathname=");
scanf("%s",pathname);
printf("local-file-pathname=");
scanf("%s",localpathname);
printf("local:%s remore:%s\n",localpathname,pathname);
fd=fopen(localpathname,"w+");
if(fd==NULL)
{
printf("cannot open file\n");
exit(1);
}
//send the command retr;
zeromery(sendline,1024);
zeromery(recvline,1024);
strcat(sendline,"RETR ");
strcat(sendline,pathname);
strcat(sendline,"\r\n");
printf("%s\n",sendline);
sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
if(sendbytes<0)
{
printf("retr send is error!\n");
}
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(recvbytes<0)
{
printf("retr recv is error!\n");
}
if(strncmp(recvline,"400",3)>0)
{
printf("return is error!\n");
}
}
//port mode
/*if(pasv_or_port==1)
{
data_sockfd=socket(AF_INET,SOCK_STREAM,0);
if(data_sockfd<0)
{
printf("创建数据端口连接失败！\n");
}
serv_addr.sin_family=AF_INET;
serv_addr.sin_addr.s_addr=INADDR_ANY;
serv_addr.sin_port=htons(SERV_PORT);
int ret;
int addrlen;
ret=sizeof(struct sockaddr_in);
getsockname(data_sockfd,(SA*)&serv_addr,&ret);
//处理port 后面要带的参数
char ip[1024];
int i,j;
char data[1024];
zeromery(ip,1024);
zeromery(data,1024);
inet_ntop(AF_INET,&(serv_addr.sin_addr),ip,sizeof(ip));
printf("%s\n",ip);
i=data_sockfd/256;
j=data_sockfd%256;
//将点分十进制的点转换为逗号。
char *ptr1;
ptr1=ip;
while(*(ptr1)!='/0')
{
if(*(ptr1)=='.')
{
*(ptr1)=',';
}
ptr1++;
}
strcat(sendline,"PORT ");
strcat(sendline,ip);
strcat(sendline,",");
strcat(sendline,itoa(i,data,10));
strcat(sendline,",");
strcat(sendline,itoa(j,data,10));
strcat(sendline,"\r\n");
printf("--->%s\n",sendline);
sendbytes=send(control_sockfd,sendline,strlen(sendline),0);
if(sendbytes<0)
{
printf("port send is error!\n");
exit(1);
}
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(strncmp(recvline,"200",3)==0)
{
printf("%s\n",recv);
}
else
{
printf("port recv is error!\n");
}
}*/
//begin to transpotr data
sleep(1);
int flag=0;
char buffer[65536];
recvdata:
zeromery(buffer,1024);
recvbytes=recv(data_sockfd,buffer,sizeof(buffer),0);
if(recvbytes<0)
{
close(data_sockfd);
goto end;
}
fwrite(buffer,1,recvbytes,fd);
zeromery(recvline,1024);
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(flag==0)
{
if(strncmp(recvline,"226",3)!=0)
{
flag=1;
goto recvdata;
}
}
end:
if(flag!=1)
{
zeromery(recvline,1024);
shutdown(data_sockfd,SHUT_WR);
close(data_sockfd);
}
close(data_sockfd);
/* int err;
char buffer[65535];
err=read(data_sockfd,buffer,sizeof(buffer));
sleep(5);
fwrite(buffer,1,err,fd);
sleep(5);
zeromery(recvline,1024);
recvbytes=recv(control_sockfd,recvline,sizeof(recvline),0);
if(strncmp(recvline,"226",3)==0)
{
end: printf("226 transfer complete\n");
close(data_sockfd);
}*/
return 0;
}
}
//
// To transfer data, we do these things in order as specifed by
// the RFC.
//
// First, we tell the other side to set up a data line. This
// is done by opendataconn() which sets up the socket. When we do that,
// the other side detects a connection attempt, so it knows we're
// there. Then tell the other side (by using listen()) that we're
// willing to receive a connection going to our side.
//
// Initialize the data connection prior to a transfer operation
// Send the PORT command followed by the optional REST command for a resume
// Finally send the LIST, RETR, or STOR command
//
// Returns >= 0 (socket) for success
// Returns -2 if cmd failed
// Returns -3 under some (forgotten) circumstances
// Returns -1 for other errors
//
static int dataconna( struct ftp_info *info, int restart, const char *fmt, ... )
{
struct opusftp_globals *ogp = info->fi_og;
va_list ap; // For varargs
int ts, ds = -1; // Temporary socket, Data socket
struct linger linger = { 1, 120 }; // Socket option
int tos = IPTOS_THROUGHPUT; // Another socket option
struct sockaddr_in from; // Socket address
int reply;
BOOL okay = FALSE;
if ((ts = opendataconn( ogp, info )) >= 0)
{
okay = TRUE;
// Have the system make an effort to deliver any unsent data
// even after we close the connection
setsockopt( ts, SOL_SOCKET, SO_LINGER, (char *)&linger, sizeof(linger) );
// Data connection is a non-interactive data stream, so
// high throughput is desired, at the expense of low
// response time
setsockopt( ts, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(tos) );
// Resuming a transfer?
if (restart)
{
// Can we use REST command?
if (!(info->fi_flags & FTP_NO_REST))
{
// Can TIMEOUT
ftp_rest( info, restart );
}
}
// Result if something failed after opendataconn and before here
ds = -3;
}
if (okay)
{
va_start( ap, fmt );
// Send main command - Can TIMEOUT
reply = vftpa( info, fmt, ap );
va_end( ap );
if (reply/100 == PRELIM || ((info->fi_flags & FTP_FEAT_MLST) && reply == 200)) // better check the actual command?
{
LONG len = sizeof(from);
// Sendport mode?
if ((info->fi_flags & FTP_NO_PASV) || !(info->fi_flags & FTP_PASSIVE))
{
ds = accept( ts, (struct sockaddr*)&from, &len );
CloseSocket( ts );
}
// Passive mode?
else
{
ds = ts;
}
}
else
ds = -2;
}
return ds;
}
