int get_transfer_fd(session_t *pses)
{
int iret = 0;
//可能是主动模式，或者被动模式
//检测是否收到PORT命令或者PASV命令
if((port_active(pses) < 0) && (pasv_active(pses) < 0))
{
ftp_reply(pses->ctrl_fd, FTP_BADSENDCONN, "Use PORT or PASV first.");
iret = -1;
return iret;
}
//主动模式
if(port_active(pses) == 0)
{
//向nobody进程发送命令
priv_sock_send_cmd(pses->child_fd, PRIV_SOCK_GET_DATA_SOCK);
unsigned short port = ntohs(pses->port_addr->sin_port);
char *ip = inet_ntoa(pses->port_addr->sin_addr);
//发送port
priv_sock_send_int(pses->child_fd, (int)port);
//发送ip
priv_sock_send_buf(pses->child_fd, ip, strlen(ip));
//接收应答
char res = priv_sock_get_result(pses->child_fd);
if(res == PRIV_SOCK_RESULT_BAD)
{
iret = -1;
}
else if(res == PRIV_SOCK_RESULT_OK)
{
//接收文件描述符
pses->data_fd = priv_sock_recv_fd(pses->child_fd);
}
}
else if(pasv_active(pses) == 0)//被动模式
{
//发送命令给nobody进程，完成客户端和服务端的连接
priv_sock_send_cmd(pses->child_fd, PRIV_SOCK_PASV_ACCEPT);
//接收nobody进程的应答
char res = priv_sock_get_result(pses->child_fd);
if(res == PRIV_SOCK_RESULT_BAD)
{
iret = -1;
}
else if(res == PRIV_SOCK_RESULT_OK)
{
pses->data_fd = priv_sock_recv_fd(pses->child_fd);
}
}
//连接成功后，该内存空间就不需要了
if(pses->port_addr != NULL)
{
free(pses->port_addr);
pses->port_addr = NULL;
}
return iret;
}
int get_port_fd(session_t* sess)
{
priv_sock_send_cmd(sess->child_fd, PRIV_SOCK_GET_DATA_SOCK);
unsigned short port = ntohs(sess->port_addr->sin_port);
char* ip = inet_ntoa(sess->port_addr->sin_addr);
priv_sock_send_int(sess->child_fd, (int)port);
priv_sock_send_buf(sess->child_fd, ip, strlen(ip));
char res = priv_sock_get_result(sess->child_fd);
if(res == PRIV_SOCK_RESULT_BAD)
return 0;
else if(res == PRIV_SOCK_RESULT_OK)
sess->data_fd = priv_sock_recv_fd(sess->child_fd);
return 1;
}
int
ftp_write_data(const struct vsf_session* p_sess, const char* p_buf,
unsigned int len)
{
if (p_sess->data_use_ssl && p_sess->ssl_slave_active)
{
int ret;
priv_sock_send_cmd(p_sess->ssl_consumer_fd, PRIV_SOCK_DO_SSL_WRITE);
priv_sock_send_buf(p_sess->ssl_consumer_fd, p_buf, len);
ret = priv_sock_get_int(p_sess->ssl_consumer_fd);
/* Need to do this here too because it is useless in the slave process. */
vsf_sysutil_check_pending_actions(kVSFSysUtilIO, ret, p_sess->data_fd);
return ret;
}
else if (p_sess->data_use_ssl)
{
return ssl_write(p_sess->p_data_ssl, p_buf, len);
}
else
{
return vsf_sysutil_write_loop(p_sess->data_fd, p_buf, len);
}
}
