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Re: SFTP example or documentation

From: Andre Guibert de Bruet <>
Date: Sun, 19 Aug 2007 01:23:34 -0400

On Aug 19, 2007, at 12:44 AM, Mathew Simon wrote:

> Are there any example or documentation available on how to use LIBCURL
> to implement a SFTP session either to upload or download a file or to
> get a directory listing. I tried to use the curleasy with a URL of
> sftp://..... I am able to make an initial connection to the SFTP
> server,
> but it aborts due to some reason. The verbose output I got is quoted
> below and it doesn't mean much.

I do not know of one. Then again, I have not looked at the libcurl
docs or google'd for one in a while.

> Text: About to connect() to port 9922 (#0)
> Text: Trying
> Text: connected
> Text: Connected to ( port 9922 (#0)
> Text: Closing connection #0
> Text: Error in the SSH layer

When debugging ssh-related problems, I find that running sshd with
the -d flag gives a good idea of why a connection attempt is failing
(Or succeeding!). If you need more verbose output, give it another -
d. Running with 3 -d flags is not recommended unless you are running
under script(1) or logging the output via some other mechanism, as it
produces TONS of output.

> How do I get more info on the problem or other debugging info on
> the SSH
> part? I am using the August-18 snapshot for both LIBCURL and
> used the following "setopts".
> url = "s";
> curl_easy_setopt(pCurl->mpCurl, CURLOPT_URL, url);
> curl_easy_setopt(pCurl->mpCurl, CURLOPT_USERPWD, FtpUserPasswd.c_str
> ());
> curl_easy_setopt(pCurl->mpCurl, CURLOPT_PORT, 9922);
> curl_easy_setopt(pCurl->mpCurl, CURLOPT_SSH_AUTH_TYPES,
> Using a SFTP client program like "WinSCP", I am able to connect to
> that
> server and hence I know that my user-ID and password work and that my
> Win-XP machine, which is behind a firewall, can successfully
> connect to
> that Server of a major company.

This would validate that the sshd is sane. Give sshd the -d flag(s).


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Received on 2007-08-19