Reading prompt from remote server without loggin in

Question

When trying to connect with a remote server using console, I do the following:

$ ssh [email protected]
[email protected]'s password:

I'm trying to mimic this with the following snippet:

ssh_session session;
ssh_channel channel;

(...)

session = ssh_new();
channel = ssh_channel_new(session);

if (channel == NULL) {
    fprintf(stderr, "Failed to create SSH channel.\n");
    ssh_disconnect(session);
    ssh_free(session);
    return (1);
}
else {
    puts("Channel open.");
}

char buffer[1024];
int nbytes = 0;

while ((nbytes = ssh_channel_read(channel, buffer, sizeof(buffer), 0)) > 0) {
    fwrite(buffer, 1, nbytes, stdout);

    if (strstr(buffer, "[email protected]\'s password:") != NULL) {
        break;
    }
}

It seems the channel is open only if I'm logged in successfully. In my case I get Failed to create SSH channel..

Is it possible to read that prompt, with or without methods provided by libssh, before logging into a server?