ssh_connect: tunnel through HTTP proxy if requested

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.

 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.

 *

 * This software is licensed as described in the file COPYING, which

 * you should have received as part of this distribution. The terms

#include "multiif.h"

#include "select.h"

#include "warnless.h"

#include "http_proxy.h"

#define _MPRINTF_REPLACE /* use our functions only */

#include <curl/mprintf.h>

     sessionhandle, deal with it */

  Curl_reset_reqproto(conn);

  if(conn->bits.tunnel_proxy && conn->bits.httpproxy) {

    /* for SSH over HTTP proxy */

    struct HTTP http_proxy;

    struct SSHPROTO *ssh_save;

    /* BLOCKING */

    /* We want "seamless" SSH operations through HTTP proxy tunnel */

    /* Curl_proxyCONNECT is based on a pointer to a struct HTTP at the member

     * conn->proto.http; we want SSH through HTTP and we have to change the

     * member temporarily for connecting to the HTTP proxy. After

     * Curl_proxyCONNECT we have to set back the member to the original struct

     * SSH pointer

     */

    ssh_save = data->state.proto.ssh;

    memset(&http_proxy, 0, sizeof(http_proxy));

    data->state.proto.http = &http_proxy;

    result = Curl_proxyCONNECT(conn, FIRSTSOCKET,

                               conn->host.name, conn->remote_port);

    data->state.proto.ssh = ssh_save;

    if(CURLE_OK != result)

      return result;

  }

  result = ssh_init(conn);

  if(result)

    return result;