ftp LIST in C

From: zhisol (zhisol@o2.pl)
Date: 04/24/03 

From: "zhisol" <zhisol@o2.pl>
Date: Thu, 24 Apr 2003 20:32:04 +0200

I've stated writing simple application for linux that list directory of
ftp server. I plan list subdirectories, too. But now, i have a PROBLEM.
I use sockets.

Connecting is simple, after assigni used only:
        sd=socket(...) //sd-socket descriptor
        connect(sd,...)
for USER, PASS, TYPE A, PASV, PWD i used:
        send(sd,"USER\r\n",...)
        recv(sd,...)
        [...]

and everything was OK, but with LIST... here i have BIG problem.
How can i receive data from ftp? Loop with recv() do nothing :(

I suppose that list return data and require new port open on client, but
i don't know how can i know which port number? For connection to ftp i
open port 21 and that's ok, but what know, I jammed :(.

Could You help me?

#cut of my code:
        [...]
        send(sd,"LIST\r\n", strlen("LIST") + 2, 0);
        n = recv (sd, buf, sizeof (buf), 0); //sd-socket descriptor
        while (n > 0)
        {
                buf[n] = '\0';
                printf ("%s", buf);
                n = recv (sd, buf, sizeof (buf), 0);
        }

PS:sorry for my english;) 

-- 
pozdr.;)
zhisol

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