FTP中的C：331/530请指定密码

FTP in C: 331 / 530 Please specify password

我在C语言中发送pass命令时遇到了一个问题，我正在编写一个简单的程序，该程序连接到一个ftp服务器并将列表打印到stdout。

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/* ----------- SET UP CONNECTION ---------*/
//creating socket
if((sock=socket(AF_INET,SOCK_STREAM,0))<0)
{
perror("Main: Creating socket:");
return ERROR;
}

//Zero out addr
memset(&addr, 0, sizeof(addr));

//Getting host name
hPtr=gethostbyname(url.host);
if(hPtr==NULL)
{
perror("Error while getting host name:");
return ERROR;
}

//Setting up addr for connect
addr.sin_addr.s_addr = inet_addr(inet_ntoa(*((struct in_addr *)hPtr->h_addr_list[0])));

addr.sin_family = AF_INET;
addr.sin_port = htons(url.port);
if((connect(sock, (struct sockaddr *)&addr, sizeof(struct sockaddr))) < 0)
{
perror("Error: Connect socket :");
close(sock);
return ERROR;
}

//Wait for Service ready
bzero(buffer, MAXBUF);
if(recv(sock, buffer, sizeof(buffer),0)<0)
{
perror("Error while receiving socket:");
}

printf("%s", buffer);

/* ----- LOGIN USER -----------*/
bzero(buffer, MAXBUF);
//setup login
strcpy(buffer,"USER");
strcat(buffer,url.user);
strcat(buffer,"
");

//Send login
if((send(sock,buffer,MAXBUF,0))<0)
{
perror("Error while sending socket:");
}
//Receive answer
if((recv(sock, buffer, sizeof(buffer),0))<0)
{
perror("Error while recieving socket:");
}
printf("%s", buffer);

//Send password
bzero(buffer, MAXBUF);
//setup password
strcpy(buffer,"PASS");
strcat(buffer,url.pass);
strcat(buffer,"
");
printf("%s",buffer);
//Send password

if((send(sock,buffer,MAXBUF,0))<0)
{
perror("Error while sending socket:");
}
//Receive response

if((recv(sock, buffer, sizeof(buffer),0))<0)
{
perror("Error while recieving socket:");
}
printf("%s", buffer);

close(sock);
return OK;

现在我成功地解析了launch参数中得到的地址。

我成功地连接了我想连接的地方：我取回了220。

发送后char*缓冲区[1024]；其中包含："用户匿名
"或"用户匿名"我得到ftp响应331请指定密码。

之后我尝试发送："pass secret
"或"pass secret
"我得到530

用户名是匿名的，密码是机密的。我用ftp测试了它，我可以连接我发错通行证了吗？或者我的整个沟通都是错的？