/* GIO - GLib Input, Output and Streaming Library

 *

 * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima

 *

 * SPDX-License-Identifier: LGPL-2.1-or-later

 *

 * 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 2.1 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, see <http://www.gnu.org/licenses/>.

 *

 * Authors: Christian Kellner <gicmo@gnome.org>

 *          Samuel Cormier-Iijima <sciyoshi@gmail.com>

 */

#include <config.h>

#include <glib.h>

#include <string.h>

#include "gunixsocketaddress.h"

#include "gsocketconnectable.h"

#include "glibintl.h"

#include "gnetworking.h"

#ifdef G_OS_WIN32

#include "giowin32-afunix.h"

#endif

/**

 * GUnixSocketAddress:

 *

 * Support for UNIX-domain (also known as local) sockets, corresponding to

 * `struct sockaddr_un`.

 *

 * UNIX domain sockets are generally visible in the filesystem.

 * However, some systems support abstract socket names which are not

 * visible in the filesystem and not affected by the filesystem

 * permissions, visibility, etc. Currently this is only supported

 * under Linux. If you attempt to use abstract sockets on other

 * systems, function calls may return `G_IO_ERROR_NOT_SUPPORTED`

 * errors. You can use [func@Gio.UnixSocketAddress.abstract_names_supported]

 * to see if abstract names are supported.

 *

 * Since GLib 2.72, `GUnixSocketAddress` is available on all platforms. It

 * requires underlying system support (such as Windows 10 with `AF_UNIX`) at

 * run time.

 *

 * Before GLib 2.72, `<gio/gunixsocketaddress.h>` belonged to the UNIX-specific

 * GIO interfaces, thus you had to use the `gio-unix-2.0.pc` pkg-config file

 * when using it. This is no longer necessary since GLib 2.72.

 */

enum

{

  PROP_0,

  PROP_PATH,

  PROP_PATH_AS_ARRAY,

  PROP_ABSTRACT,

  PROP_ADDRESS_TYPE

};

#ifndef UNIX_PATH_MAX

#define UNIX_PATH_MAX G_SIZEOF_MEMBER (struct sockaddr_un, sun_path)

#endif

struct _GUnixSocketAddressPrivate

{

  char path[UNIX_PATH_MAX]; /* Not including the initial zero in abstract case, so

             we can guarantee zero termination of abstract

             pathnames in the get_path() API */

  gsize path_len; /* Not including any terminating zeros */

  GUnixSocketAddressType address_type;

};

static void   g_unix_socket_address_connectable_iface_init (GSocketConnectableIface *iface);

static gchar *g_unix_socket_address_connectable_to_string  (GSocketConnectable      *connectable);

G_DEFINE_TYPE_WITH_CODE (GUnixSocketAddress, g_unix_socket_address, G_TYPE_SOCKET_ADDRESS,

                         G_ADD_PRIVATE (GUnixSocketAddress)

                         G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,

                                                g_unix_socket_address_connectable_iface_init))

static void

g_unix_socket_address_set_property (GObject      *object,

            guint         prop_id,

            const GValue *value,

            GParamSpec   *pspec)

{

  GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);

  const char *str;

  GByteArray *array;

  gsize len;

  switch (prop_id)

    {

    case PROP_PATH:

      str = g_value_get_string (value);

      if (str)

  {

    g_strlcpy (address->priv->path, str,

         sizeof (address->priv->path));

    address->priv->path_len = strlen (address->priv->path);

  }

      break;

    case PROP_PATH_AS_ARRAY:

      array = g_value_get_boxed (value);

      if (array)

  {

    /* Clip to fit in UNIX_PATH_MAX with zero termination or first byte */

    len = MIN (array->len, UNIX_PATH_MAX-1);

    if (len != 0)

      memcpy (address->priv->path, array->data, len);

    address->priv->path[len] = 0; /* Ensure null-terminated */

    address->priv->path_len = len;

  }

      break;

    case PROP_ABSTRACT:

      /* Only set it if it's not the default... */

      if (g_value_get_boolean (value))

       address->priv->address_type = G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED;

      break;

    case PROP_ADDRESS_TYPE:

      /* Only set it if it's not the default... */

      if (g_value_get_enum (value) != G_UNIX_SOCKET_ADDRESS_PATH)

        address->priv->address_type = g_value_get_enum (value);

      break;

    default:

      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

    }

}

static void

g_unix_socket_address_get_property (GObject    *object,

            guint       prop_id,

            GValue     *value,

            GParamSpec *pspec)

{

  GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);

  GByteArray *array;

  switch (prop_id)

    {

      case PROP_PATH:

  g_value_set_string (value, address->priv->path);

  break;

      case PROP_PATH_AS_ARRAY:

  array = g_byte_array_sized_new (address->priv->path_len);

  g_byte_array_append (array, (guint8 *)address->priv->path, address->priv->path_len);

  g_value_take_boxed (value, array);

  break;

      case PROP_ABSTRACT:

  g_value_set_boolean (value, (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||

             address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED));

  break;

      case PROP_ADDRESS_TYPE:

  g_value_set_enum (value, address->priv->address_type);

  break;

      default:

  G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);

    }

}

static GSocketFamily

g_unix_socket_address_get_family (GSocketAddress *address)

{

  g_assert (PF_UNIX == G_SOCKET_FAMILY_UNIX);

  return G_SOCKET_FAMILY_UNIX;

}

static gssize

g_unix_socket_address_get_native_size (GSocketAddress *address)

{

  GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);

  switch (addr->priv->address_type)

    {

    case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:

      return G_STRUCT_OFFSET(struct sockaddr_un, sun_path);

    case G_UNIX_SOCKET_ADDRESS_ABSTRACT:

      return G_STRUCT_OFFSET(struct sockaddr_un, sun_path) + addr->priv->path_len + 1;

    default:

      return sizeof (struct sockaddr_un);

    }

}

static gboolean

g_unix_socket_address_to_native (GSocketAddress *address,

         gpointer        dest,

         gsize           destlen,

         GError        **error)

{

  GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);

  struct sockaddr_un *sock;

  gssize socklen;

  socklen = g_unix_socket_address_get_native_size (address);

  g_assert (socklen >= 0);

  if (destlen < (gsize) socklen)

    {

      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE,

         _("Not enough space for socket address"));

      return FALSE;

    }

  sock = (struct sockaddr_un *) dest;

  memset (sock, 0, socklen);

  sock->sun_family = AF_UNIX;

  switch (addr->priv->address_type)

    {

    case G_UNIX_SOCKET_ADDRESS_INVALID:

    case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:

      break;

    case G_UNIX_SOCKET_ADDRESS_PATH:

      strcpy (sock->sun_path, addr->priv->path);

      break;

    case G_UNIX_SOCKET_ADDRESS_ABSTRACT:

    case G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED:

      if (!g_unix_socket_address_abstract_names_supported ())

  {

    g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,

             _("Abstract UNIX domain socket addresses not supported on this system"));

    return FALSE;

  }

      sock->sun_path[0] = 0;

      memcpy (sock->sun_path+1, addr->priv->path, addr->priv->path_len);

      break;

    }

  return TRUE;

}

static void

g_unix_socket_address_class_init (GUnixSocketAddressClass *klass)

{

  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);

  GSocketAddressClass *gsocketaddress_class = G_SOCKET_ADDRESS_CLASS (klass);

  gobject_class->set_property = g_unix_socket_address_set_property;

  gobject_class->get_property = g_unix_socket_address_get_property;

  gsocketaddress_class->get_family = g_unix_socket_address_get_family;

  gsocketaddress_class->to_native = g_unix_socket_address_to_native;

  gsocketaddress_class->get_native_size = g_unix_socket_address_get_native_size;

  /**

   * GUnixSocketAddress:path:

   *

   * Unix socket path.

   *

   * Since: 2.22

   */

  g_object_class_install_property (gobject_class,

           PROP_PATH,

           g_param_spec_string ("path", NULL, NULL,

              NULL,

              G_PARAM_READWRITE |

              G_PARAM_CONSTRUCT_ONLY |

              G_PARAM_STATIC_STRINGS));

  /**

   * GUnixSocketAddress:path-as-array:

   *

   * Unix socket path, as a byte array.

   *

   * Since: 2.22

   */

  g_object_class_install_property (gobject_class, PROP_PATH_AS_ARRAY,

           g_param_spec_boxed ("path-as-array", NULL, NULL,

                   G_TYPE_BYTE_ARRAY,

                   G_PARAM_READWRITE |

                   G_PARAM_CONSTRUCT_ONLY |

                   G_PARAM_STATIC_STRINGS));

  /**

   * GUnixSocketAddress:abstract:

   *

   * Whether or not this is an abstract address

   *

   * Deprecated: Use #GUnixSocketAddress:address-type, which

   * distinguishes between zero-padded and non-zero-padded

   * abstract addresses.

   */

  g_object_class_install_property (gobject_class, PROP_ABSTRACT,

           g_param_spec_boolean ("abstract", NULL, NULL,

               FALSE,

               G_PARAM_READWRITE |

               G_PARAM_CONSTRUCT_ONLY |

               G_PARAM_STATIC_STRINGS));

  /**

   * GUnixSocketAddress:address-type:

   *

   * The type of Unix socket address.

   *

   * Since: 2.22

   */

  g_object_class_install_property (gobject_class, PROP_ADDRESS_TYPE,

           g_param_spec_enum ("address-type", NULL, NULL,

                  G_TYPE_UNIX_SOCKET_ADDRESS_TYPE,

                  G_UNIX_SOCKET_ADDRESS_PATH,

                  G_PARAM_READWRITE |

                  G_PARAM_CONSTRUCT_ONLY |

                  G_PARAM_STATIC_STRINGS));

}

static void

g_unix_socket_address_connectable_iface_init (GSocketConnectableIface *iface)

{

  GSocketConnectableIface *parent_iface = g_type_interface_peek_parent (iface);

  iface->enumerate = parent_iface->enumerate;

  iface->proxy_enumerate = parent_iface->proxy_enumerate;

  iface->to_string = g_unix_socket_address_connectable_to_string;

}

static gchar *

g_unix_socket_address_connectable_to_string (GSocketConnectable *connectable)

{

  GUnixSocketAddress *ua;

  GString *out;

  const gchar *path;

  gsize path_len, i;

  ua = G_UNIX_SOCKET_ADDRESS (connectable);

  /* Anonymous sockets have no path. */

  if (ua->priv->address_type == G_UNIX_SOCKET_ADDRESS_ANONYMOUS)

    return g_strdup ("anonymous");

  path = g_unix_socket_address_get_path (ua);

  path_len = g_unix_socket_address_get_path_len (ua);

  out = g_string_sized_new (path_len);

  /* Return the #GUnixSocketAddress:path, but with all non-printable characters

   * (including nul bytes) escaped to hex. */

  for (i = 0; i < path_len; i++)

    {

      guint8 c = path[i];

      if (g_ascii_isprint (path[i]))

        g_string_append_c (out, c);

      else

        g_string_append_printf (out, "\\x%02x", (guint) c);

    }

  return g_string_free (out, FALSE);

}

static void

g_unix_socket_address_init (GUnixSocketAddress *address)

{

  address->priv = g_unix_socket_address_get_instance_private (address);

  memset (address->priv->path, 0, sizeof (address->priv->path));

  address->priv->path_len = -1;

  address->priv->address_type = G_UNIX_SOCKET_ADDRESS_PATH;

}

/**

 * g_unix_socket_address_new:

 * @path: the socket path

 *

 * Creates a new #GUnixSocketAddress for @path.

 *

 * To create abstract socket addresses, on systems that support that,

 * use g_unix_socket_address_new_abstract().

 *

 * Returns: a new #GUnixSocketAddress

 *

 * Since: 2.22

 */

GSocketAddress *

g_unix_socket_address_new (const gchar *path)

{

  return g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,

           "path", path,

           "abstract", FALSE,

           NULL);

}

/**

 * g_unix_socket_address_new_abstract:

 * @path: (array length=path_len) (element-type gchar): the abstract name

 * @path_len: the length of @path, or -1

 *

 * Creates a new %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED

 * #GUnixSocketAddress for @path.

 *

 * Returns: a new #GUnixSocketAddress

 *

 * Deprecated: Use g_unix_socket_address_new_with_type().

 */

GSocketAddress *

g_unix_socket_address_new_abstract (const gchar *path,

            gint         path_len)

{

  return g_unix_socket_address_new_with_type (path, path_len,

                G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);

}

/**

 * g_unix_socket_address_new_with_type:

 * @path: (array length=path_len) (element-type gchar): the name

 * @path_len: the length of @path, or -1

 * @type: a #GUnixSocketAddressType

 *

 * Creates a new #GUnixSocketAddress of type @type with name @path.

 *

 * If @type is %G_UNIX_SOCKET_ADDRESS_PATH, this is equivalent to

 * calling g_unix_socket_address_new().

 *

 * If @type is %G_UNIX_SOCKET_ADDRESS_ANONYMOUS, @path and @path_len will be

 * ignored.

 *

 * If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT, then @path_len

 * bytes of @path will be copied to the socket's path, and only those

 * bytes will be considered part of the name. (If @path_len is -1,

 * then @path is assumed to be NUL-terminated.) For example, if @path

 * was "test", then calling g_socket_address_get_native_size() on the

 * returned socket would return 7 (2 bytes of overhead, 1 byte for the

 * abstract-socket indicator byte, and 4 bytes for the name "test").

 *

 * If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED, then

 * @path_len bytes of @path will be copied to the socket's path, the

 * rest of the path will be padded with 0 bytes, and the entire

 * zero-padded buffer will be considered the name. (As above, if

 * @path_len is -1, then @path is assumed to be NUL-terminated.) In

 * this case, g_socket_address_get_native_size() will always return

 * the full size of a `struct sockaddr_un`, although

 * g_unix_socket_address_get_path_len() will still return just the

 * length of @path.

 *

 * %G_UNIX_SOCKET_ADDRESS_ABSTRACT is preferred over

 * %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED for new programs. Of course,

 * when connecting to a server created by another process, you must

 * use the appropriate type corresponding to how that process created

 * its listening socket.

 *

 * Returns: a new #GUnixSocketAddress

 *

 * Since: 2.26

 */

GSocketAddress *

g_unix_socket_address_new_with_type (const gchar            *path,

             gint                    path_len,

             GUnixSocketAddressType  type)

{

  GSocketAddress *address;

  GByteArray *array;

  size_t path_len_unsigned;

  if (type == G_UNIX_SOCKET_ADDRESS_ANONYMOUS)

    path_len_unsigned = 0;

  else if (path_len < 0)

    path_len_unsigned = strlen (path);

  else

    path_len_unsigned = (size_t) path_len;

  /* The code below can’t handle anything longer. */

  g_return_val_if_fail (path_len_unsigned <= G_MAXUINT, NULL);

  array = g_byte_array_sized_new (path_len_unsigned);

  g_byte_array_append (array, (guint8 *)path, path_len_unsigned);

  address = g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,

        "path-as-array", array,

        "address-type", type,

        NULL);

  g_byte_array_unref (array);

  return address;

}

/**

 * g_unix_socket_address_get_path:

 * @address: a #GInetSocketAddress

 *

 * Gets @address's path, or for abstract sockets the "name".

 *

 * Guaranteed to be zero-terminated, but an abstract socket

 * may contain embedded zeros, and thus you should use

 * g_unix_socket_address_get_path_len() to get the true length

 * of this string.

 *

 * Returns: the path for @address

 *

 * Since: 2.22

 */

const char *

g_unix_socket_address_get_path (GUnixSocketAddress *address)

{

  return address->priv->path;

}

/**

 * g_unix_socket_address_get_path_len:

 * @address: a #GInetSocketAddress

 *

 * Gets the length of @address's path.

 *

 * For details, see g_unix_socket_address_get_path().

 *

 * Returns: the length of the path

 *

 * Since: 2.22

 */

gsize

g_unix_socket_address_get_path_len (GUnixSocketAddress *address)

{

  return address->priv->path_len;

}

/**

 * g_unix_socket_address_get_address_type:

 * @address: a #GInetSocketAddress

 *

 * Gets @address's type.

 *

 * Returns: a #GUnixSocketAddressType

 *

 * Since: 2.26

 */

GUnixSocketAddressType

g_unix_socket_address_get_address_type (GUnixSocketAddress *address)

{

  return address->priv->address_type;

}

/**

 * g_unix_socket_address_get_is_abstract:

 * @address: a #GInetSocketAddress

 *

 * Tests if @address is abstract.

 *

 * Returns: %TRUE if the address is abstract, %FALSE otherwise

 *

 * Since: 2.22

 *

 * Deprecated: Use g_unix_socket_address_get_address_type()

 */

gboolean

g_unix_socket_address_get_is_abstract (GUnixSocketAddress *address)

{

  return (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||

    address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);

}

/**

 * g_unix_socket_address_abstract_names_supported:

 *

 * Checks if abstract UNIX domain socket names are supported.

 *

 * Returns: %TRUE if supported, %FALSE otherwise

 *

 * Since: 2.22

 */

gboolean

g_unix_socket_address_abstract_names_supported (void)

{

#ifdef __linux__

  return TRUE;

#else

  return FALSE;

#endif

}