请问 FTP over SSL with libcurl

请教 FTP over SSL with libcurl

<br />code = curl_easy_setopt(ftp_handle, CURLOPT_URL, "ftp:127.0.0.1:990/");<br />code = curl_easy_setopt(ftp_handle, CURLOPT_USERNAME, "username");<br />code = curl_easy_setopt(ftp_handle, CURLOPT_PASSWORD, "password");<br />code = curl_easy_setopt(ftp_handle, CURLOPT_DIRLISTONLY, 1L);<br /> <br />/*<br />code = curl_easy_setopt(ftp_handle, CURLOPT_FTP_SSL_CCC, CURLFTPSSL_CCC_NONE);<br />code = curl_easy_setopt(ftp_handle, CURLOPT_SSL_VERIFYPEER, 1L);<br />code = curl_easy_setopt(ftp_handle, CURLOPT_SSL_VERIFYHOST, 2L);<br />code = curl_easy_setopt(ftp_handle, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_TLS);<br />code = curl_easy_setopt(ftp_handle, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);<br />*/<br /> <br />/*<br />code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_TYPE, 1L);<br />code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_USERNAME, "tms");<br />code = curl_easy_setopt(ftp_handle, CURLOPT_TLSAUTH_PASSWORD, "ewstms");<br />*/<br /> <br />/*<br />code = curl_easy_setopt(ftp_handle, CURLOPT_USE_SSL, CURLUSESSL_ALL);<br />*/<br /> <br />code = curl_easy_setopt(ftp_handle, CURLOPT_VERBOSE, 1L);<br /><br />CURLcode res = curl_easy_perform(ftp_handle);<br />

上面的代码，会一直在curl_easy_perform轮询，什么也没做，等到超时了才跳出来，不知道怎么弄


虽然我贴的是C++的代码，但我看到PHP也会用到libcurl(CURL)，所以来碰下运气

问题：
FTP服务器强制要求SSL认证登陆，
客户端的代码，应该如何设置选项? (curl_easy_setopt应该设置哪些内容)
网上找不到有用的资料，如果你刚好做过这个，希望给予帮助，谢谢

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