On 10/19/2014 4:43 AM, Daniel Karunairatnam wrote:
> Hi guys,
>
> I'm trying to use libcurl in Visual Studio Express C++ 2010 (Windows
> 8) to upload and append files to an sftp server.
> I am using the following code (taken from
> http://curl.haxx.se/libcurl/c/sftpget.html, with a few changes).
...
> curl_easy_setopt(curl, CURLOPT_URL,
> "10.1.1.4");
> curl_easy_setopt(curl, CURLOPT_PORT, 22);

That's just like writing http://10.1.1.4:22 it's going override the port
as 22 but it's still HTTP. You need the sftp:// just like in the
example. If sftp and your port is 22 you don't need to specify it either
in the URL or via CURLOPT_PORT.

> #ifndef DISABLE_SSH_AGENT
> /* We activate ssh agent. For this to work you need
> to have ssh-agent running (type set | grep SSH_AGENT to check) or
> pageant on Windows (there is an icon in systray if so) */
> curl_easy_setopt(curl, CURLOPT_SSH_AUTH_TYPES, CURLSSH_AUTH_AGENT);
> #endif

Do you have an ssh agent? The example undefs DISABLE_SSH_AGENT so even
if you define it it's undefined. If you don't have an SSH agent change
line 29 to #define DISABLE_SSH_AGENT.

> I have similar experiences using both the private server I need to
> connect to, and a server I set up using freeSSHd.
> If I use sftp:// before the ip address/hostname, i get a stack error.
> it says the stack around variable hash is corrupt.

freeSSHd may not set the home directory in a way that can't be
understood so click the SFTP tab and change the home directory to
something other than $HOME like your desktop. Also if you are running
freeSSHd as a service try disabling the service and running it directly
from the GUI.

I don't know why you're seeing stack errors but I tried your code and
connected to a freeSSHd 1.2.6 server and it seemed to work ok to
download a file and read the directory. However on this computer I only
have an older version of libcurl to test with that wasn't compiled using
visual studio. It can be found on the downloads page (7.34.0, libcurl,
SSL, Günter Knauf).
curl 7.34.0 (i386-pc-win32) libcurl/7.34.0 OpenSSL/1.0.0l zlib/1.2.8
libidn/1.18
  libssh2/1.4.3 librtmp/2.3
Protocols: dict file ftp ftps gopher http https imap imaps ldap pop3
pop3s rtmp
rtsp scp sftp smtp smtps telnet tftp
Features: AsynchDNS GSS-Negotiate IDN Largefile NTLM SPNEGO SSL SSPI libz

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Received on 2014-10-19