/* virt-click
 * Copyright (C) 2011 Red Hat Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Parts are derived from 'gvnccapture':
 *
 * Vnc Image Capture
 *
 * Copyright (C) 2010 Daniel P. Berrange <dan@berrange.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.0 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif

#include <glib/gi18n.h>
#include <vncconnection.h>
#include <vncbaseframebuffer.h>

#include "click.h"

static const guint preferable_auths[] = {
  /*
   * Both these two provide TLS based auth, and can layer
   * all the other auth types on top. So these two must
   * be the first listed
   */
  VNC_CONNECTION_AUTH_VENCRYPT,
  VNC_CONNECTION_AUTH_TLS,

  /*
   * Then stackable auth types in order of preference
   */
  VNC_CONNECTION_AUTH_SASL,
  VNC_CONNECTION_AUTH_MSLOGON,
  VNC_CONNECTION_AUTH_VNC,

  /*
   * Or nothing at all
   */
  VNC_CONNECTION_AUTH_NONE
};


static gchar *
get_credential (const gchar *prompt, gboolean doecho)
{
#ifdef HAVE_TERMIOS_H
  struct termios old, new;
#endif
  gchar buf[100];
  gchar *res;
  int n = sizeof(buf);
  ssize_t len;

  printf("%s", prompt);
  fflush(stdout);

#ifdef HAVE_TERMIOS_H
  /* Turn echoing off and fail if we can't. */
  if (!doecho && tcgetattr (fileno (stdin), &old) != 0)
    return NULL;
  new = old;
  new.c_lflag &= ~ECHO;
  if (!doecho && tcsetattr(fileno(stdin), TCSAFLUSH, &new) != 0)
    return NULL;
#else
  doecho = TRUE; /* Avoid unused parameter compile warning */
#endif

  /* Read the password. */
  if ((res = fgets(buf, n, stdin)) != NULL) {
    len = strlen(res);
    if (res[len-1] == '\n')
      res[len-1] = '\0';
  }

#ifdef HAVE_TERMIOS_H
  /* Restore terminal. */
  if (!doecho) {
    printf("\n");
    (void) tcsetattr(fileno (stdin), TCSAFLUSH, &old);
  }
#endif

  return res ? g_strdup(res) : NULL;
}

void
vc_vnc_auth_credential (VncConnection *conn, GValueArray *credList,
                        gpointer opaque)
{
  self_t *self = opaque;
  guint i;
  char **data;

  data = g_new0(char *, credList->n_values);

  for (i = 0 ; i < credList->n_values ; i++) {
    GValue *cred = g_value_array_get_nth(credList, i);
    switch (g_value_get_enum(cred)) {
    case VNC_CONNECTION_CREDENTIAL_PASSWORD:
      data[i] = get_credential ("Password: ", FALSE);
      if (!data[i]) {
        if (verbose)
          fprintf (stderr, "vnc: failed to read password\n");
        vnc_connection_shutdown(conn);
        goto cleanup;
      }
      break;
    case VNC_CONNECTION_CREDENTIAL_USERNAME:
      data[i] = get_credential ("Username: ", TRUE);
      if (!data[i]) {
        if (verbose)
          fprintf (stderr, "vnc: failed to read username\n");
        vnc_connection_shutdown(conn);
        goto cleanup;
      }
      break;
    case VNC_CONNECTION_CREDENTIAL_CLIENTNAME:
      data[i] = g_strdup ("virt-click");
      break;
    default:
      break;
    }
  }
  for (i = 0 ; i < credList->n_values ; i++) {
    GValue *cred = g_value_array_get_nth(credList, i);
    if (data[i]) {
      if (!vnc_connection_set_credential(conn,
                                         g_value_get_enum(cred),
                                         data[i])) {
        fprintf (stderr, "vnc: failed to set credential type %d %s\n",
                 g_value_get_enum(cred), data[i]);
        vnc_connection_shutdown(conn);
      }
    } else {
      if (verbose)
        fprintf (stderr, "vnc: unsupported credential type %d\n",
                 g_value_get_enum(cred));
      vnc_connection_shutdown(conn);
    }
  }

 cleanup:
  for (i = 0 ; i < credList->n_values ; i++)
    g_free(data[i]);
  g_free(data);
}

void
vc_vnc_auth_choose_type (VncConnection *conn,
                         GValueArray *types,
                         gpointer opaque G_GNUC_UNUSED)
{
  guint i, j;

  if (!types->n_values) {
    VNC_DEBUG("No auth types to choose from");
    return;
  }

  for (i = 0 ; i < G_N_ELEMENTS(preferable_auths) ; i++) {
    int pref = preferable_auths[i];

    for (j = 0 ; j < types->n_values ; j++) {
      GValue *type = g_value_array_get_nth(types, j);
      VNC_DEBUG("Compare %d vs %d", pref, g_value_get_enum(type));
      if (pref == g_value_get_enum(type)) {
        VNC_DEBUG("Chosen auth %d", pref);
        vnc_connection_set_auth_type(conn, pref);
        return;
      }
    }
  }

  GValue *type = g_value_array_get_nth(types, 0);
  VNC_DEBUG("Chosen default auth %d", g_value_get_enum(type));
  vnc_connection_set_auth_type(conn, g_value_get_enum(type));
}