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/* GIO - GLib Input, Output and Streaming Library
 *
 * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
 * Copyright © 2009 Codethink Limited
 * Copyright © 2009 Red Hat, Inc
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 * Copyright © 2015 Collabora, Ltd.
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 *
 * 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
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 * version 2.1 of the License, or (at your option) any later version.
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 *
 * 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
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 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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 *
 * Authors: Christian Kellner <gicmo@gnome.org>
 *          Samuel Cormier-Iijima <sciyoshi@gmail.com>
 *          Ryan Lortie <desrt@desrt.ca>
 *          Alexander Larsson <alexl@redhat.com>
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 *          Philip Withnall <philip.withnall@collabora.co.uk>
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 */

#include "config.h"
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#include "gsocket.h"
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#ifdef G_OS_UNIX
#include "glib-unix.h"
#endif

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#include <errno.h>
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#include <signal.h>
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#include <string.h>
#include <stdlib.h>
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#ifndef G_OS_WIN32
# include <fcntl.h>
# include <unistd.h>
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# include <sys/ioctl.h>
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#endif

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#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif

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#ifdef G_OS_UNIX
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#include <sys/uio.h>
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#endif
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#define GOBJECT_COMPILATION
#include "gobject/gtype-private.h" /* For _PRELUDE type define */
#undef GOBJECT_COMPILATION
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#include "gcancellable.h"
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#include "gdatagrambased.h"
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#include "gioenumtypes.h"
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#include "ginetaddress.h"
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#include "ginitable.h"
#include "gioerror.h"
#include "gioenums.h"
#include "gioerror.h"
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#include "gnetworkingprivate.h"
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#include "gsocketaddress.h"
#include "gsocketcontrolmessage.h"
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#include "gcredentials.h"
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#include "gcredentialsprivate.h"
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#include "glibintl.h"

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#ifdef G_OS_WIN32
/* For Windows XP runtime compatibility, but use the system's if_nametoindex() if available */
#include "gwin32networking.h"
#endif

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/**
 * SECTION:gsocket
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 * @short_description: Low-level socket object
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 * @include: gio/gio.h
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 * @see_also: #GInitable, [<gnetworking.h>][gio-gnetworking.h]
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 *
 * A #GSocket is a low-level networking primitive. It is a more or less
 * direct mapping of the BSD socket API in a portable GObject based API.
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 * It supports both the UNIX socket implementations and winsock2 on Windows.
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 *
 * #GSocket is the platform independent base upon which the higher level
 * network primitives are based. Applications are not typically meant to
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 * use it directly, but rather through classes like #GSocketClient,
 * #GSocketService and #GSocketConnection. However there may be cases where
 * direct use of #GSocket is useful.
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 *
 * #GSocket implements the #GInitable interface, so if it is manually constructed
 * by e.g. g_object_new() you must call g_initable_init() and check the
 * results before using the object. This is done automatically in
 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
 * %NULL.
 *
 * Sockets operate in two general modes, blocking or non-blocking. When
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 * in blocking mode all operations (which don’t take an explicit blocking
 * parameter) block until the requested operation
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 * is finished or there is an error. In non-blocking mode all calls that
 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
 * To know when a call would successfully run you can call g_socket_condition_check(),
 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
 * attach it to a #GMainContext to get callbacks when I/O is possible.
 * Note that all sockets are always set to non blocking mode in the system, and
 * blocking mode is emulated in GSocket.
 *
 * When working in non-blocking mode applications should always be able to
 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
 * function said that I/O was possible. This can easily happen in case
 * of a race condition in the application, but it can also happen for other
 * reasons. For instance, on Windows a socket is always seen as writable
 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
 *
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 * #GSockets can be either connection oriented or datagram based.
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 * For connection oriented types you must first establish a connection by
 * either connecting to an address or accepting a connection from another
 * address. For connectionless socket types the target/source address is
 * specified or received in each I/O operation.
 *
 * All socket file descriptors are set to be close-on-exec.
 *
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 * Note that creating a #GSocket causes the signal %SIGPIPE to be
 * ignored for the remainder of the program. If you are writing a
 * command-line utility that uses #GSocket, you may need to take into
 * account the fact that your program will not automatically be killed
 * if it tries to write to %stdout after it has been closed.
 *
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 * Like most other APIs in GLib, #GSocket is not inherently thread safe. To use
 * a #GSocket concurrently from multiple threads, you must implement your own
 * locking.
 *
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 * Since: 2.22
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 */
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static void     g_socket_initable_iface_init (GInitableIface  *iface);
static gboolean g_socket_initable_init       (GInitable       *initable,
					      GCancellable    *cancellable,
					      GError         **error);

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static void     g_socket_datagram_based_iface_init       (GDatagramBasedInterface *iface);
static gint     g_socket_datagram_based_receive_messages (GDatagramBased  *self,
                                                          GInputMessage   *messages,
                                                          guint            num_messages,
                                                          gint             flags,
                                                          gint64           timeout,
                                                          GCancellable    *cancellable,
                                                          GError         **error);
static gint     g_socket_datagram_based_send_messages    (GDatagramBased  *self,
                                                          GOutputMessage  *messages,
                                                          guint            num_messages,
                                                          gint             flags,
                                                          gint64           timeout,
                                                          GCancellable    *cancellable,
                                                          GError         **error);
static GSource *g_socket_datagram_based_create_source    (GDatagramBased           *self,
                                                          GIOCondition              condition,
                                                          GCancellable             *cancellable);
static GIOCondition g_socket_datagram_based_condition_check      (GDatagramBased   *datagram_based,
                                                                  GIOCondition      condition);
static gboolean     g_socket_datagram_based_condition_wait       (GDatagramBased   *datagram_based,
                                                                  GIOCondition      condition,
                                                                  gint64            timeout,
                                                                  GCancellable     *cancellable,
                                                                  GError          **error);

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static GSocketAddress *
cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len);

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static gssize
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g_socket_receive_message_with_timeout  (GSocket                 *socket,
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                                        GSocketAddress         **address,
                                        GInputVector            *vectors,
                                        gint                     num_vectors,
                                        GSocketControlMessage ***messages,
                                        gint                    *num_messages,
                                        gint                    *flags,
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                                        gint64                   timeout,
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                                        GCancellable            *cancellable,
                                        GError                 **error);
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static gint
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g_socket_receive_messages_with_timeout (GSocket        *socket,
                                        GInputMessage  *messages,
                                        guint           num_messages,
                                        gint            flags,
                                        gint64          timeout,
                                        GCancellable   *cancellable,
                                        GError        **error);
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static gssize
g_socket_send_message_with_timeout     (GSocket                 *socket,
                                        GSocketAddress          *address,
                                        GOutputVector           *vectors,
                                        gint                     num_vectors,
                                        GSocketControlMessage  **messages,
                                        gint                     num_messages,
                                        gint                     flags,
                                        gint64                   timeout,
                                        GCancellable            *cancellable,
                                        GError                 **error);
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static gint
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g_socket_send_messages_with_timeout    (GSocket        *socket,
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                                        GOutputMessage *messages,
                                        guint           num_messages,
                                        gint            flags,
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                                        gint64          timeout,
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                                        GCancellable   *cancellable,
                                        GError        **error);

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enum
{
  PROP_0,
  PROP_FAMILY,
  PROP_TYPE,
  PROP_PROTOCOL,
  PROP_FD,
  PROP_BLOCKING,
  PROP_LISTEN_BACKLOG,
  PROP_KEEPALIVE,
  PROP_LOCAL_ADDRESS,
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  PROP_REMOTE_ADDRESS,
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  PROP_TIMEOUT,
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  PROP_TTL,
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  PROP_BROADCAST,
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  PROP_MULTICAST_LOOPBACK,
  PROP_MULTICAST_TTL
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};

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/* Size of the receiver cache for g_socket_receive_from() */
#define RECV_ADDR_CACHE_SIZE 8

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struct _GSocketPrivate
{
  GSocketFamily   family;
  GSocketType     type;
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  GSocketProtocol protocol;
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  gint            fd;
  gint            listen_backlog;
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  guint           timeout;
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  GError         *construct_error;
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  GSocketAddress *remote_address;
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  guint           inited : 1;
  guint           blocking : 1;
  guint           keepalive : 1;
  guint           closed : 1;
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  guint           connected_read : 1;
  guint           connected_write : 1;
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  guint           listening : 1;
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  guint           timed_out : 1;
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  guint           connect_pending : 1;
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#ifdef G_OS_WIN32
  WSAEVENT        event;
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  gboolean        waiting;
  DWORD           waiting_result;
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  int             current_events;
  int             current_errors;
  int             selected_events;
  GList          *requested_conditions; /* list of requested GIOCondition * */
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  GMutex          win32_source_lock;
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  GCond           win32_source_cond;
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#endif
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  struct {
    GSocketAddress *addr;
    struct sockaddr *native;
    gint native_len;
    guint64 last_used;
  } recv_addr_cache[RECV_ADDR_CACHE_SIZE];
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};

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_G_DEFINE_TYPE_EXTENDED_WITH_PRELUDE (GSocket, g_socket, G_TYPE_OBJECT, 0,
                                      /* Need a prelude for https://bugzilla.gnome.org/show_bug.cgi?id=674885 */
                                      g_type_ensure (G_TYPE_SOCKET_FAMILY);
                                      g_type_ensure (G_TYPE_SOCKET_TYPE);
                                      g_type_ensure (G_TYPE_SOCKET_PROTOCOL);
                                      g_type_ensure (G_TYPE_SOCKET_ADDRESS);
                                      /* And networking init is appropriate for the prelude */
                                      g_networking_init ();
                                      , /* And now the regular type init code */
                                      G_ADD_PRIVATE (GSocket)
                                      G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
                                                             g_socket_initable_iface_init);
                                      G_IMPLEMENT_INTERFACE (G_TYPE_DATAGRAM_BASED,
                                                             g_socket_datagram_based_iface_init));
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static int
get_socket_errno (void)
{
#ifndef G_OS_WIN32
  return errno;
#else
  return WSAGetLastError ();
#endif
}

static GIOErrorEnum
socket_io_error_from_errno (int err)
{
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#ifdef G_OS_WIN32
  return g_io_error_from_win32_error (err);
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#else
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  return g_io_error_from_errno (err);
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#endif
}

static const char *
socket_strerror (int err)
{
#ifndef G_OS_WIN32
  return g_strerror (err);
#else
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  const char *msg_ret;
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  char *msg;
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  msg = g_win32_error_message (err);
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  msg_ret = g_intern_string (msg);
  g_free (msg);

  return msg_ret;
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#endif
}

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/* Wrapper around g_set_error() to avoid doing excess work */
#define socket_set_error_lazy(err, errsv, fmt)                          \
  G_STMT_START {                                                        \
    GError **__err = (err);                                             \
    int __errsv = (errsv);                                              \
                                                                        \
    if (__err)                                                          \
      {                                                                 \
        int __code = socket_io_error_from_errno (__errsv);              \
        const char *__strerr = socket_strerror (__errsv);               \
                                                                        \
        if (__code == G_IO_ERROR_WOULD_BLOCK)                           \
          g_set_error_literal (__err, G_IO_ERROR, __code, __strerr);    \
        else                                                            \
          g_set_error (__err, G_IO_ERROR, __code, fmt, __strerr);       \
      }                                                                 \
  } G_STMT_END

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#ifdef G_OS_WIN32
#define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
static void
_win32_unset_event_mask (GSocket *socket, int mask)
{
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  g_mutex_lock (&socket->priv->win32_source_lock);
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  socket->priv->current_events &= ~mask;
  socket->priv->current_errors &= ~mask;
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  g_mutex_unlock (&socket->priv->win32_source_lock);
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}
#else
#define win32_unset_event_mask(_socket, _mask)
#endif

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/* Windows has broken prototypes... */
#ifdef G_OS_WIN32
#define getsockopt(sockfd, level, optname, optval, optlen) \
  getsockopt (sockfd, level, optname, (gpointer) optval, (int*) optlen)
#define setsockopt(sockfd, level, optname, optval, optlen) \
  setsockopt (sockfd, level, optname, (gpointer) optval, optlen)
#define getsockname(sockfd, addr, addrlen) \
  getsockname (sockfd, addr, (int *)addrlen)
#define getpeername(sockfd, addr, addrlen) \
  getpeername (sockfd, addr, (int *)addrlen)
#define recv(sockfd, buf, len, flags) \
  recv (sockfd, (gpointer)buf, len, flags)
#endif

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static gboolean
check_socket (GSocket *socket,
	      GError **error)
{
  if (!socket->priv->inited)
    {
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      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
                           _("Invalid socket, not initialized"));
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      return FALSE;
    }

  if (socket->priv->construct_error)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
		   _("Invalid socket, initialization failed due to: %s"),
		   socket->priv->construct_error->message);
      return FALSE;
    }

  if (socket->priv->closed)
    {
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
			   _("Socket is already closed"));
      return FALSE;
    }
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  return TRUE;
}

static gboolean
check_timeout (GSocket *socket,
	       GError **error)
{
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  if (socket->priv->timed_out)
    {
      socket->priv->timed_out = FALSE;
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
			   _("Socket I/O timed out"));
      return FALSE;
    }

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  return TRUE;
}

static void
g_socket_details_from_fd (GSocket *socket)
{
  struct sockaddr_storage address;
  gint fd;
  guint addrlen;
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  int value, family;
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  int errsv;

  fd = socket->priv->fd;
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  if (!g_socket_get_option (socket, SOL_SOCKET, SO_TYPE, &value, NULL))
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    {
      errsv = get_socket_errno ();
      goto err;
    }

  switch (value)
    {
     case SOCK_STREAM:
      socket->priv->type = G_SOCKET_TYPE_STREAM;
      break;

     case SOCK_DGRAM:
      socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
      break;

     case SOCK_SEQPACKET:
      socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
      break;

     default:
      socket->priv->type = G_SOCKET_TYPE_INVALID;
      break;
    }

  addrlen = sizeof address;
  if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
    {
      errsv = get_socket_errno ();
      goto err;
    }

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  if (addrlen > 0)
    {
      g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
		sizeof address.ss_family <= addrlen);
      family = address.ss_family;
    }
  else
    {
      /* On Solaris, this happens if the socket is not yet connected.
       * But we can use SO_DOMAIN as a workaround there.
       */
#ifdef SO_DOMAIN
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      if (!g_socket_get_option (socket, SOL_SOCKET, SO_DOMAIN, &family, NULL))
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	{
	  errsv = get_socket_errno ();
	  goto err;
	}
#else
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      /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
      errsv = -1;
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      goto err;
#endif
    }

  switch (family)
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    {
     case G_SOCKET_FAMILY_IPV4:
     case G_SOCKET_FAMILY_IPV6:
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       socket->priv->family = address.ss_family;
       switch (socket->priv->type)
	 {
	 case G_SOCKET_TYPE_STREAM:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
	   break;

	 case G_SOCKET_TYPE_DATAGRAM:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
	   break;

	 case G_SOCKET_TYPE_SEQPACKET:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
	   break;

	 default:
	   break;
	 }
       break;

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     case G_SOCKET_FAMILY_UNIX:
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       socket->priv->family = G_SOCKET_FAMILY_UNIX;
       socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
       break;
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     default:
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       socket->priv->family = G_SOCKET_FAMILY_INVALID;
       break;
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    }

  if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
    {
      addrlen = sizeof address;
      if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
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        {
          socket->priv->connected_read = TRUE;
          socket->priv->connected_write = TRUE;
        }
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    }

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  if (g_socket_get_option (socket, SOL_SOCKET, SO_KEEPALIVE, &value, NULL))
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    {
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      socket->priv->keepalive = !!value;
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    }
  else
    {
      /* Can't read, maybe not supported, assume FALSE */
      socket->priv->keepalive = FALSE;
    }

  return;

 err:
  g_set_error (&socket->priv->construct_error, G_IO_ERROR,
	       socket_io_error_from_errno (errsv),
	       _("creating GSocket from fd: %s"),
	       socket_strerror (errsv));
}

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/* Wrapper around socket() that is shared with gnetworkmonitornetlink.c */
gint
g_socket (gint     domain,
          gint     type,
          gint     protocol,
          GError **error)
{
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  int fd, errsv;
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#ifdef SOCK_CLOEXEC
  fd = socket (domain, type | SOCK_CLOEXEC, protocol);
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  errsv = errno;
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  if (fd != -1)
    return fd;

  /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
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  if (fd < 0 && (errsv == EINVAL || errsv == EPROTOTYPE))
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#endif
    fd = socket (domain, type, protocol);

  if (fd < 0)
    {
      int errsv = get_socket_errno ();

      g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
		   _("Unable to create socket: %s"), socket_strerror (errsv));
      errno = errsv;
      return -1;
    }

#ifndef G_OS_WIN32
  {
    int flags;

    /* We always want to set close-on-exec to protect users. If you
       need to so some weird inheritance to exec you can re-enable this
       using lower level hacks with g_socket_get_fd(). */
    flags = fcntl (fd, F_GETFD, 0);
    if (flags != -1 &&
	(flags & FD_CLOEXEC) == 0)
      {
	flags |= FD_CLOEXEC;
	fcntl (fd, F_SETFD, flags);
      }
  }
#endif

  return fd;
}

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static gint
g_socket_create_socket (GSocketFamily   family,
			GSocketType     type,
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			int             protocol,
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			GError        **error)
{
  gint native_type;

  switch (type)
    {
     case G_SOCKET_TYPE_STREAM:
      native_type = SOCK_STREAM;
      break;

     case G_SOCKET_TYPE_DATAGRAM:
      native_type = SOCK_DGRAM;
      break;

     case G_SOCKET_TYPE_SEQPACKET:
      native_type = SOCK_SEQPACKET;
      break;

     default:
      g_assert_not_reached ();
    }

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  if (family <= 0)
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    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
                   _("Unable to create socket: %s"), _("Unknown family was specified"));
      return -1;
    }

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  if (protocol == -1)
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    {
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      g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
		   _("Unable to create socket: %s"), _("Unknown protocol was specified"));
      return -1;
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    }

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  return g_socket (family, native_type, protocol, error);
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}

static void
g_socket_constructed (GObject *object)
{
  GSocket *socket = G_SOCKET (object);

  if (socket->priv->fd >= 0)
    /* create socket->priv info from the fd */
    g_socket_details_from_fd (socket);

  else
    /* create the fd from socket->priv info */
    socket->priv->fd = g_socket_create_socket (socket->priv->family,
					       socket->priv->type,
					       socket->priv->protocol,
					       &socket->priv->construct_error);

  if (socket->priv->fd != -1)
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    {
#ifndef G_OS_WIN32
      GError *error = NULL;
#else
      gulong arg;
#endif

      /* Always use native nonblocking sockets, as Windows sets sockets to
       * nonblocking automatically in certain operations. This way we make
       * things work the same on all platforms.
       */
#ifndef G_OS_WIN32
      if (!g_unix_set_fd_nonblocking (socket->priv->fd, TRUE, &error))
        {
          g_warning ("Error setting socket nonblocking: %s", error->message);
          g_clear_error (&error);
        }
#else
      arg = TRUE;

      if (ioctlsocket (socket->priv->fd, FIONBIO, &arg) == SOCKET_ERROR)
        {
          int errsv = get_socket_errno ();
          g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
        }
#endif
681 682 683 684 685

#ifdef SO_NOSIGPIPE
      /* See note about SIGPIPE below. */
      g_socket_set_option (socket, SOL_SOCKET, SO_NOSIGPIPE, TRUE, NULL);
#endif
686
    }
687 688 689 690 691 692 693 694 695
}

static void
g_socket_get_property (GObject    *object,
		       guint       prop_id,
		       GValue     *value,
		       GParamSpec *pspec)
{
  GSocket *socket = G_SOCKET (object);
696
  GSocketAddress *address;
697 698 699 700 701 702 703 704 705 706 707 708

  switch (prop_id)
    {
      case PROP_FAMILY:
	g_value_set_enum (value, socket->priv->family);
	break;

      case PROP_TYPE:
	g_value_set_enum (value, socket->priv->type);
	break;

      case PROP_PROTOCOL:
709
	g_value_set_enum (value, socket->priv->protocol);
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
	break;

      case PROP_FD:
	g_value_set_int (value, socket->priv->fd);
	break;

      case PROP_BLOCKING:
	g_value_set_boolean (value, socket->priv->blocking);
	break;

      case PROP_LISTEN_BACKLOG:
	g_value_set_int (value, socket->priv->listen_backlog);
	break;

      case PROP_KEEPALIVE:
	g_value_set_boolean (value, socket->priv->keepalive);
	break;

      case PROP_LOCAL_ADDRESS:
729 730
	address = g_socket_get_local_address (socket, NULL);
	g_value_take_object (value, address);
731 732 733
	break;

      case PROP_REMOTE_ADDRESS:
734 735
	address = g_socket_get_remote_address (socket, NULL);
	g_value_take_object (value, address);
736 737
	break;

738 739 740 741
      case PROP_TIMEOUT:
	g_value_set_uint (value, socket->priv->timeout);
	break;

742 743 744 745
      case PROP_TTL:
	g_value_set_uint (value, g_socket_get_ttl (socket));
	break;

746 747 748 749
      case PROP_BROADCAST:
	g_value_set_boolean (value, g_socket_get_broadcast (socket));
	break;

750 751 752 753 754 755 756 757
      case PROP_MULTICAST_LOOPBACK:
	g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
	break;

      case PROP_MULTICAST_TTL:
	g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
	break;

758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781
      default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
g_socket_set_property (GObject      *object,
		       guint         prop_id,
		       const GValue *value,
		       GParamSpec   *pspec)
{
  GSocket *socket = G_SOCKET (object);

  switch (prop_id)
    {
      case PROP_FAMILY:
	socket->priv->family = g_value_get_enum (value);
	break;

      case PROP_TYPE:
	socket->priv->type = g_value_get_enum (value);
	break;

      case PROP_PROTOCOL:
782
	socket->priv->protocol = g_value_get_enum (value);
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800
	break;

      case PROP_FD:
	socket->priv->fd = g_value_get_int (value);
	break;

      case PROP_BLOCKING:
	g_socket_set_blocking (socket, g_value_get_boolean (value));
	break;

      case PROP_LISTEN_BACKLOG:
	g_socket_set_listen_backlog (socket, g_value_get_int (value));
	break;

      case PROP_KEEPALIVE:
	g_socket_set_keepalive (socket, g_value_get_boolean (value));
	break;

801 802 803 804
      case PROP_TIMEOUT:
	g_socket_set_timeout (socket, g_value_get_uint (value));
	break;

805 806 807 808
      case PROP_TTL:
	g_socket_set_ttl (socket, g_value_get_uint (value));
	break;

809 810 811 812
      case PROP_BROADCAST:
	g_socket_set_broadcast (socket, g_value_get_boolean (value));
	break;

813 814 815 816 817 818 819 820
      case PROP_MULTICAST_LOOPBACK:
	g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
	break;

      case PROP_MULTICAST_TTL:
	g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
	break;

821 822 823 824 825 826 827 828 829
      default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
g_socket_finalize (GObject *object)
{
  GSocket *socket = G_SOCKET (object);
830
  gint i;
831 832 833 834 835 836 837

  g_clear_error (&socket->priv->construct_error);

  if (socket->priv->fd != -1 &&
      !socket->priv->closed)
    g_socket_close (socket, NULL);

838 839 840
  if (socket->priv->remote_address)
    g_object_unref (socket->priv->remote_address);

841
#ifdef G_OS_WIN32
842 843 844 845 846 847
  if (socket->priv->event != WSA_INVALID_EVENT)
    {
      WSACloseEvent (socket->priv->event);
      socket->priv->event = WSA_INVALID_EVENT;
    }

848
  g_assert (socket->priv->requested_conditions == NULL);
849
  g_mutex_clear (&socket->priv->win32_source_lock);
850
  g_cond_clear (&socket->priv->win32_source_cond);
851 852
#endif

853 854 855 856 857 858 859 860 861
  for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
    {
      if (socket->priv->recv_addr_cache[i].addr)
        {
          g_object_unref (socket->priv->recv_addr_cache[i].addr);
          g_free (socket->priv->recv_addr_cache[i].native);
        }
    }

862 863 864 865 866 867 868 869 870
  if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
    (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
}

static void
g_socket_class_init (GSocketClass *klass)
{
  GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);

871 872 873 874
#ifdef SIGPIPE
  /* There is no portable, thread-safe way to avoid having the process
   * be killed by SIGPIPE when calling send() or sendmsg(), so we are
   * forced to simply ignore the signal process-wide.
875 876 877 878 879
   *
   * Even if we ignore it though, gdb will still stop if the app
   * receives a SIGPIPE, which can be confusing and annoying. So when
   * possible, we also use MSG_NOSIGNAL / SO_NOSIGPIPE elsewhere to
   * prevent the signal from occurring at all.
880 881 882 883
   */
  signal (SIGPIPE, SIG_IGN);
#endif

884 885 886 887 888 889 890 891 892 893 894
  gobject_class->finalize = g_socket_finalize;
  gobject_class->constructed = g_socket_constructed;
  gobject_class->set_property = g_socket_set_property;
  gobject_class->get_property = g_socket_get_property;

  g_object_class_install_property (gobject_class, PROP_FAMILY,
				   g_param_spec_enum ("family",
						      P_("Socket family"),
						      P_("The sockets address family"),
						      G_TYPE_SOCKET_FAMILY,
						      G_SOCKET_FAMILY_INVALID,
895 896 897
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));
898 899 900 901 902 903 904

  g_object_class_install_property (gobject_class, PROP_TYPE,
				   g_param_spec_enum ("type",
						      P_("Socket type"),
						      P_("The sockets type"),
						      G_TYPE_SOCKET_TYPE,
						      G_SOCKET_TYPE_STREAM,
905 906 907
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));
908 909

  g_object_class_install_property (gobject_class, PROP_PROTOCOL,
910
				   g_param_spec_enum ("protocol",
911 912
						      P_("Socket protocol"),
						      P_("The id of the protocol to use, or -1 for unknown"),
913 914
						      G_TYPE_SOCKET_PROTOCOL,
						      G_SOCKET_PROTOCOL_UNKNOWN,
915 916 917
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));
918 919 920 921 922 923 924 925

  g_object_class_install_property (gobject_class, PROP_FD,
				   g_param_spec_int ("fd",
						     P_("File descriptor"),
						     P_("The sockets file descriptor"),
						     G_MININT,
						     G_MAXINT,
						     -1,
926 927 928
						     G_PARAM_CONSTRUCT_ONLY |
                                                     G_PARAM_READWRITE |
                                                     G_PARAM_STATIC_STRINGS));
929 930 931 932 933 934

  g_object_class_install_property (gobject_class, PROP_BLOCKING,
				   g_param_spec_boolean ("blocking",
							 P_("blocking"),
							 P_("Whether or not I/O on this socket is blocking"),
							 TRUE,
935 936
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));
937 938 939 940

  g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
				   g_param_spec_int ("listen-backlog",
						     P_("Listen backlog"),
941
						     P_("Outstanding connections in the listen queue"),
942 943 944
						     0,
						     SOMAXCONN,
						     10,
945 946
						     G_PARAM_READWRITE |
                                                     G_PARAM_STATIC_STRINGS));
947 948 949 950 951 952

  g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
				   g_param_spec_boolean ("keepalive",
							 P_("Keep connection alive"),
							 P_("Keep connection alive by sending periodic pings"),
							 FALSE,
953 954
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));
955 956 957 958 959 960

  g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
				   g_param_spec_object ("local-address",
							P_("Local address"),
							P_("The local address the socket is bound to"),
							G_TYPE_SOCKET_ADDRESS,
961 962
							G_PARAM_READABLE |
                                                        G_PARAM_STATIC_STRINGS));
963 964 965 966 967 968

  g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
				   g_param_spec_object ("remote-address",
							P_("Remote address"),
							P_("The remote address the socket is connected to"),
							G_TYPE_SOCKET_ADDRESS,
969 970
							G_PARAM_READABLE |
                                                        G_PARAM_STATIC_STRINGS));
971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

  /**
   * GSocket:timeout:
   *
   * The timeout in seconds on socket I/O
   *
   * Since: 2.26
   */
  g_object_class_install_property (gobject_class, PROP_TIMEOUT,
				   g_param_spec_uint ("timeout",
						      P_("Timeout"),
						      P_("The timeout in seconds on socket I/O"),
						      0,
						      G_MAXUINT,
						      0,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));
988

989 990 991
  /**
   * GSocket:broadcast:
   *
992
   * Whether the socket should allow sending to broadcast addresses.
993 994 995 996 997 998
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_BROADCAST,
				   g_param_spec_boolean ("broadcast",
							 P_("Broadcast"),
999
							 P_("Whether to allow sending to broadcast addresses"),
1000 1001 1002 1003
							 FALSE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
  /**
   * GSocket:ttl:
   *
   * Time-to-live for outgoing unicast packets
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_TTL,
				   g_param_spec_uint ("ttl",
						      P_("TTL"),
						      P_("Time-to-live of outgoing unicast packets"),
						      0, G_MAXUINT, 0,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));

1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
  /**
   * GSocket:multicast-loopback:
   *
   * Whether outgoing multicast packets loop back to the local host.
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
				   g_param_spec_boolean ("multicast-loopback",
							 P_("Multicast loopback"),
							 P_("Whether outgoing multicast packets loop back to the local host"),
							 TRUE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:multicast-ttl:
   *
   * Time-to-live out outgoing multicast packets
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
				   g_param_spec_uint ("multicast-ttl",
						      P_("Multicast TTL"),
						      P_("Time-to-live of outgoing multicast packets"),
						      0, G_MAXUINT, 1,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));
1048 1049 1050 1051 1052 1053 1054 1055
}

static void
g_socket_initable_iface_init (GInitableIface *iface)
{
  iface->init = g_socket_initable_init;
}

1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
static void
g_socket_datagram_based_iface_init (GDatagramBasedInterface *iface)
{
  iface->receive_messages = g_socket_datagram_based_receive_messages;
  iface->send_messages = g_socket_datagram_based_send_messages;
  iface->create_source = g_socket_datagram_based_create_source;
  iface->condition_check = g_socket_datagram_based_condition_check;
  iface->condition_wait = g_socket_datagram_based_condition_wait;
}

1066 1067 1068
static void
g_socket_init (GSocket *socket)
{
1069
  socket->priv = g_socket_get_instance_private (socket);
1070 1071 1072 1073 1074 1075 1076

  socket->priv->fd = -1;
  socket->priv->blocking = TRUE;
  socket->priv->listen_backlog = 10;
  socket->priv->construct_error = NULL;
#ifdef G_OS_WIN32
  socket->priv->event = WSA_INVALID_EVENT;
1077
  g_mutex_init (&socket->priv->win32_source_lock);
1078
  g_cond_init (&socket->priv->win32_source_cond);
1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
#endif
}

static gboolean
g_socket_initable_init (GInitable *initable,
			GCancellable *cancellable,
			GError  **error)
{
  GSocket  *socket;

  g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);

  socket = G_SOCKET (initable);

  if (cancellable != NULL)
    {
1095 1096
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                           _("Cancellable initialization not supported"));
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
      return FALSE;
    }

  socket->priv->inited = TRUE;

  if (socket->priv->construct_error)
    {
      if (error)
	*error = g_error_copy (socket->priv->construct_error);
      return FALSE;
    }


  return TRUE;
}

1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
static gboolean
check_datagram_based (GDatagramBased  *self,
                      GError         **error)
{
  switch (g_socket_get_socket_type (G_SOCKET (self)))
    {
    case G_SOCKET_TYPE_INVALID:
    case G_SOCKET_TYPE_STREAM:
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                   _("Cannot use datagram operations on a non-datagram "
                     "socket."));
      return FALSE;
    case G_SOCKET_TYPE_DATAGRAM:
    case G_SOCKET_TYPE_SEQPACKET:
      /* Fall through. */
      break;
    }

  /* Due to us sharing #GSocketSource with the #GSocket implementation, it is
   * pretty tricky to split out #GSocket:timeout so that it does not affect
   * #GDatagramBased operations (but still affects #GSocket operations). It is
   * not worth that effort — just disallow it and require the user to specify
   * timeouts on a per-operation basis. */
  if (g_socket_get_timeout (G_SOCKET (self)) != 0)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                   _("Cannot use datagram operations on a socket with a "
                     "timeout set."));
      return FALSE;
    }

  return TRUE;
}

static gint
g_socket_datagram_based_receive_messages (GDatagramBased  *self,
                                          GInputMessage   *messages,
                                          guint            num_messages,
                                          gint             flags,
                                          gint64           timeout,
                                          GCancellable    *cancellable,
                                          GError         **error)
{
  if (!check_datagram_based (self, error))
    return FALSE;

  return g_socket_receive_messages_with_timeout (G_SOCKET (self), messages,
                                                 num_messages, flags, timeout,
                                                 cancellable, error);
}

static gint
g_socket_datagram_based_send_messages (GDatagramBased  *self,
                                       GOutputMessage  *messages,
                                       guint            num_messages,
                                       gint             flags,
                                       gint64           timeout,
                                       GCancellable    *cancellable,
                                       GError         **error)
{
  if (!check_datagram_based (self, error))
    return FALSE;

  return g_socket_send_messages_with_timeout (G_SOCKET (self), messages,
                                              num_messages, flags, timeout,
                                              cancellable, error);
}

static GSource *
g_socket_datagram_based_create_source (GDatagramBased  *self,
                                       GIOCondition     condition,
                                       GCancellable    *cancellable)
{
  if (!check_datagram_based (self, NULL))
    return NULL;

  return g_socket_create_source (G_SOCKET (self), condition, cancellable);
}

static GIOCondition
g_socket_datagram_based_condition_check (GDatagramBased  *datagram_based,
                                         GIOCondition     condition)
{
  if (!check_datagram_based (datagram_based, NULL))
    return G_IO_ERR;

  return g_socket_condition_check (G_SOCKET (datagram_based), condition);
}

static gboolean
g_socket_datagram_based_condition_wait (GDatagramBased  *datagram_based,
                                        GIOCondition     condition,
                                        gint64           timeout,
                                        GCancellable    *cancellable,
                                        GError         **error)
{
  if (!check_datagram_based (datagram_based, error))
    return FALSE;

  return g_socket_condition_timed_wait (G_SOCKET (datagram_based), condition,
                                        timeout, cancellable, error);
}

1216 1217 1218 1219
/**
 * g_socket_new:
 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
 * @type: the socket type to use.
1220
 * @protocol: the id of the protocol to use, or 0 for default.
1221 1222 1223
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Creates a new #GSocket with the defined family, type and protocol.
1224 1225 1226 1227 1228 1229 1230 1231
 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
 * for the family and type is used.
 *
 * The @protocol is a family and type specific int that specifies what
 * kind of protocol to use. #GSocketProtocol lists several common ones.
 * Many families only support one protocol, and use 0 for this, others
 * support several and using 0 means to use the default protocol for
 * the family and type.
1232
 *
1233 1234 1235
 * The protocol id is passed directly to the operating
 * system, so you can use protocols not listed in #GSocketProtocol if you
 * know the protocol number used for it.
1236
 *
1237 1238 1239 1240
 * Returns: a #GSocket or %NULL on error.
 *     Free the returned object with g_object_unref().
 *
 * Since: 2.22
1241
 */
1242
GSocket *
1243 1244 1245 1246
g_socket_new (GSocketFamily     family,
	      GSocketType       type,
	      GSocketProtocol   protocol,
	      GError          **error)
1247 1248 1249 1250 1251
{
  return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
				   NULL, error,
				   "family", family,
				   "type", type,
1252
				   "protocol", protocol,
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268
				   NULL));
}

/**
 * g_socket_new_from_fd:
 * @fd: a native socket file descriptor.
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Creates a new #GSocket from a native file descriptor
 * or winsock SOCKET handle.
 *
 * This reads all the settings from the file descriptor so that
 * all properties should work. Note that the file descriptor
 * will be set to non-blocking mode, independent on the blocking
 * mode of the #GSocket.
 *
1269 1270 1271
 * On success, the returned #GSocket takes ownership of @fd. On failure, the
 * caller must close @fd themselves.
 *
1272 1273 1274
 * Since GLib 2.46, it is no longer a fatal error to call this on a non-socket
 * descriptor.  Instead, a GError will be set with code %G_IO_ERROR_FAILED
 *
1275 1276 1277 1278
 * Returns: a #GSocket or %NULL on error.
 *     Free the returned object with g_object_unref().
 *
 * Since: 2.22
1279
 */
1280
GSocket *
1281
g_socket_new_from_fd (gint     fd,
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		      GError **error)
{
  return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
				   NULL, error,
				   "fd", fd,
				   NULL));
}

/**
 * g_socket_set_blocking:
 * @socket: a #GSocket.
 * @blocking: Whether to use blocking I/O or not.
 *
 * Sets the blocking mode of the socket. In blocking mode
1296 1297
 * all operations (which don’t take an explicit blocking parameter) block until
 * they succeed or there is an error. In
1298 1299 1300 1301 1302 1303 1304 1305
 * non-blocking mode all functions return results immediately or
 * with a %G_IO_ERROR_WOULD_BLOCK error.
 *
 * All sockets are created in blocking mode. However, note that the
 * platform level socket is always non-blocking, and blocking mode
 * is a GSocket level feature.
 *
 * Since: 2.22
1306
 */
1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
void
g_socket_set_blocking (GSocket  *socket,
		       gboolean  blocking)
{
  g_return_if_fail (G_IS_SOCKET (socket));

  blocking = !!blocking;

  if (socket->priv->blocking == blocking)
    return;

  socket->priv->blocking = blocking;
  g_object_notify (G_OBJECT (socket), "blocking");
}

/**
 * g_socket_get_blocking:
 * @socket: a #GSocket.
 *
 * Gets the blocking mode of the socket. For details on blocking I/O,
 * see g_socket_set_blocking().
 *
 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
 *
 * Since: 2.22
1332
 */
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
gboolean
g_socket_get_blocking (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  return socket->priv->blocking;
}

/**
 * g_socket_set_keepalive:
 * @socket: a #GSocket.
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Dan Winship committed
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 * @keepalive: Value for the keepalive flag
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 *
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Dan Winship committed
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 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
 * this flag is set on a socket, the system will attempt to verify that the
 * remote socket endpoint is still present if a sufficiently long period of
 * time passes with no data being exchanged. If the system is unable to
 * verify the presence of the remote endpoint, it will automatically close
 * the connection.
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 *
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 * This option is only functional on certain kinds of sockets. (Notably,
 * %G_SOCKET_PROTOCOL_TCP sockets.)
 *
 * The exact time between pings is system- and protocol-dependent, but will
 * normally be at least two hours. Most commonly, you would set this flag
 * on a server socket if you want to allow clients to remain idle for long
 * periods of time, but also want to ensure that connections are eventually
 * garbage-collected if clients crash or become unreachable.
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 *
 * Since: 2.22
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 */
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void
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g_socket_set_keepalive (GSocket  *socket,
			gboolean  keepalive)
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{
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  GError *error = NULL;
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  g_return_if_fail (G_IS_SOCKET (socket));

  keepalive = !!keepalive;
  if (socket->priv->keepalive == keepalive)
    return;

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  if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
			    keepalive, &error))
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    {
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      g_warning ("error setting keepalive: %s", error->message);
      g_error_free (error);
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      return;
    }

  socket->priv->keepalive = keepalive;
  g_object_notify (G_OBJECT (socket), "keepalive");
}

/**
 * g_socket_get_keepalive:
 * @socket: a #GSocket.
 *
 * Gets the keepalive mode of the socket. For details on this,
 * see g_socket_set_keepalive().
 *
 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
 *
 * Since: 2.22
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 */
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gboolean
g_socket_get_keepalive (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  return socket->priv->keepalive;
}

/**
 * g_socket_get_listen_backlog:
 * @socket: a #GSocket.
 *
 * Gets the listen backlog setting of the socket. For details on this,
 * see g_socket_set_listen_backlog().
 *
 * Returns: the maximum number of pending connections.
 *
 * Since: 2.22
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 */
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gint
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g_socket_get_listen_backlog  (GSocket *socket)
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{
  g_return_val_if_fail (G_IS_SOCKET (socket), 0);

  return socket->priv->listen_backlog;
}

/**
 * g_socket_set_listen_backlog:
 * @socket: a #GSocket.
 * @backlog: the maximum number of pending connections.
 *
 * Sets the maximum number of outstanding connections allowed
 * when listening on this socket. If more clients than this are
 * connecting to the socket and the application is not handling them
 * on time then the new connections will be refused.
 *
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 * Note that this must be called before g_socket_listen() and has no
 * effect if called after that.
 *
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 * Since: 2.22
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 */
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void
g_socket_set_listen_backlog (GSocket *socket,
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			     gint     backlog)
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{
  g_return_if_fail (G_IS_SOCKET (socket));
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  g_return_if_fail (!socket->priv->listening);
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  if (backlog != socket->priv->listen_backlog)
    {
      socket->priv->listen_backlog = backlog;
      g_object_notify (G_OBJECT (socket), "listen-backlog");
    }
}

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/**
 * g_socket_get_timeout:
 * @socket: a #GSocket.
 *
 * Gets the timeout setting of the socket. For details on this, see
 * g_socket_set_timeout().
 *
 * Returns: the timeout in seconds
 *
 * Since: 2.26
 */
guint
g_socket_get_timeout (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), 0);

  return socket->priv->timeout;
}

/**
 * g_socket_set_timeout:
 * @socket: a #GSocket.
 * @timeout: the timeout for @socket, in seconds, or 0 for none
 *
 * Sets the time in seconds after which I/O operations on @socket will
 * time out if they have not yet completed.
 *
 * On a blocking socket, this means that any blocking #GSocket
 * operation will time out after @timeout seconds of inactivity,
 * returning %G_IO_ERROR_TIMED_OUT.
 *
 * On a non-blocking socket, calls to g_socket_condition_wait() will
 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
 * created with g_socket_create_source() will trigger after
 * @timeout seconds of inactivity, with the requested condition
 * set, at which point calling g_socket_receive(), g_socket_send(),
 * g_socket_check_connect_result(), etc, will fail with
 * %G_IO_ERROR_TIMED_OUT.
 *
 * If @timeout is 0 (the default), operations will never time out
 * on their own.
 *
 * Note that if an I/O operation is interrupted by a signal, this may
 * cause the timeout to be reset.
 *
 * Since: 2.26
 */
void
g_socket_set_timeout (GSocket *socket,
		      guint    timeout)
{
  g_return_if_fail (G_IS_SOCKET (socket));

  if (timeout != socket->priv->timeout)
    {
      socket->priv->timeout = timeout;
      g_object_notify (G_OBJECT (socket), "timeout");
    }
}

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/**
 * g_socket_get_ttl:
 * @socket: a #GSocket.
 *
 * Gets the unicast time-to-live setting on @socket; see
 * g_socket_set_ttl() for more details.
 *
 * Returns: the time-to-live setting on @socket
 *
 * Since: 2.32
 */
guint
g_socket_get_ttl (GSocket *socket)
{
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  GError *error = NULL;
  gint value;
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  g_return_val_if_fail (G_IS_SOCKET (socket), 0);
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  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
			   &value, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
			   &value, &error);
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    }
  else
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    g_return_val_if_reached (0);
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  if (error)
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    {
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      g_warning ("error getting unicast ttl: %s", error->message);
      g_error_free (error);
      return 0;
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    }

  return value;
}

/**
 * g_socket_set_ttl:
 * @socket: a #GSocket.
 * @ttl: the time-to-live value for all unicast packets on @socket
 *
 * Sets the time-to-live for outgoing unicast packets on @socket.
 * By default the platform-specific default value is used.
 *
 * Since: 2.32
 */
void
g_socket_set_ttl (GSocket  *socket,
                  guint     ttl)
{
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  GError *error = NULL;
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  g_return_if_fail (G_IS_SOCKET (socket));

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
			   ttl, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
			   ttl, NULL);
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      g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
			   ttl, &error);
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    }
  else
    g_return_if_reached ();

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  if (error)
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    {
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      g_warning ("error setting unicast ttl: %s", error->message);
      g_error_free (error);
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      return;
    }

  g_object_notify (G_OBJECT (socket), "ttl");
}

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/**
 * g_socket_get_broadcast:
 * @socket: a #GSocket.
 *
 * Gets the broadcast setting on @socket; if %TRUE,
 * it is possible to send packets to broadcast
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 * addresses.
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 *
 * Returns: the broadcast setting on @socket
 *
 * Since: 2.32
 */
gboolean
g_socket_get_broadcast (GSocket *socket)
{
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  GError *error = NULL;
  gint value;
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  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

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  if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
			    &value, &error))
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    {
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      g_warning ("error getting broadcast: %s", error->message);
      g_error_free (error);
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      return FALSE;
    }

  return !!value;
}

/**
 * g_socket_set_broadcast:
 * @socket: a #GSocket.
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 * @broadcast: whether @socket should allow sending to broadcast
 *     addresses
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 *
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 * Sets whether @socket should allow sending to broadcast addresses.
 * This is %FALSE by default.
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 *
 * Since: 2.32
 */
void
g_socket_set_broadcast (GSocket    *socket,
       	                gboolean    broadcast)
{
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  GError *error = NULL;
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  g_return_if_fail (G_IS_SOCKET (socket));

  broadcast = !!broadcast;

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  if (!g_socket_set_option (socket, SOL_SOCKET, SO_BROADCAST,
			    broadcast, &error))
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    {
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      g_warning ("error setting broadcast: %s", error->message);
      g_error_free (error);
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      return;
    }

  g_object_notify (G_OBJECT (socket), "broadcast");
}

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/**
 * g_socket_get_multicast_loopback:
 * @socket: a #GSocket.
 *
 * Gets the multicast loopback setting on @socket; if %TRUE (the
 * default), outgoing multicast packets will be looped back to
 * multicast listeners on the same host.
 *
 * Returns: the multicast loopback setting on @socket
 *
 * Since: 2.32
 */
gboolean
g_socket_get_multicast_loopback (GSocket *socket)
{
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  GError *error = NULL;
  gint value;
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  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
			   &value, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
			   &value, &error);
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    }
  else
    g_return_val_if_reached (FALSE);

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  if (error)
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    {
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      g_warning ("error getting multicast loopback: %s", error->message);
      g_error_free (error);
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      return FALSE;
    }

  return !!value;
}

/**
 * g_socket_set_multicast_loopback:
 * @socket: a #GSocket.
 * @loopback: whether @socket should receive messages sent to its
 *   multicast groups from the local host
 *
 * Sets whether outgoing multicast packets will be received by sockets
 * listening on that multicast address on the same host. This is %TRUE
 * by default.
 *
 * Since: 2.32
 */
void
g_socket_set_multicast_loopback (GSocket    *socket,
				 gboolean    loopback)
{
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  GError *error = NULL;
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  g_return_if_fail (G_IS_SOCKET (socket));

  loopback = !!loopback;

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
			   loopback, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
			   loopback, NULL);
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      g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
			   loopback, &error);
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    }
  else
    g_return_if_reached ();

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  if (error)
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    {
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      g_warning ("error setting multicast loopback: %s", error->message);
      g_error_free (error);
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      return;
    }

  g_object_notify (G_OBJECT (socket), "multicast-loopback");
}

/**
 * g_socket_get_multicast_ttl:
 * @socket: a #GSocket.
 *
 * Gets the multicast time-to-live setting on @socket; see
 * g_socket_set_multicast_ttl() for more details.
 *
 * Returns: the multicast time-to-live setting on @socket
 *
 * Since: 2.32
 */
guint
g_socket_get_multicast_ttl (GSocket *socket)
{
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  GError *error = NULL;
  gint value;
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  g_return_val_if_fail (G_IS_SOCKET (socket), 0);
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  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
			   &value, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
			   &value, &error);
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    }
  else
    g_return_val_if_reached (FALSE);

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  if (error)
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    {
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      g_warning ("error getting multicast ttl: %s", error->message);
      g_error_free (error);
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      return FALSE;
    }

  return value;
}

/**
 * g_socket_set_multicast_ttl:
 * @socket: a #GSocket.
 * @ttl: the time-to-live value for all multicast datagrams on @socket
 *
 * Sets the time-to-live for outgoing multicast datagrams on @socket.
 * By default, this is 1, meaning that multicast packets will not leave
 * the local network.
 *
 * Since: 2.32
 */
void
g_socket_set_multicast_ttl (GSocket  *socket,
                            guint     ttl)
{
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  GError *error = NULL;
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  g_return_if_fail (G_IS_SOCKET (socket));

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
			   ttl, &error);
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    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
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      g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
			   ttl, NULL);
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      g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
			   ttl, &error);
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    }
  else
    g_return_if_reached ();

1829
  if (error)
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    {
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      g_warning ("error setting multicast ttl: %s", error->message);
      g_error_free (error);
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      return;
    }

  g_object_notify (G_OBJECT (socket), "multicast-ttl");
}

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/**
 * g_socket_get_family:
 * @socket: a #GSocket.
 *
 * Gets the socket family of the socket.
 *
 * Returns: a #GSocketFamily
 *
 * Since: 2.22
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 */
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GSocketFamily
g_socket_get_family (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);

  return socket->priv->family;
}

/**
 * g_socket_get_socket_type:
 * @socket: a #GSocket.
 *
 * Gets the socket type of the socket.
 *
 * Returns: a #GSocketType
 *
 * Since: 2.22
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 */
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GSocketType
g_socket_get_socket_type (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);

  return socket->priv->type;
}

/**
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 * g_socket_get_protocol:
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 * @socket: a #GSocket.
 *
 * Gets the socket protocol id the socket was created with.
 * In case the protocol is unknown, -1 is returned.
 *
 * Returns: a protocol id, or -1 if unknown
 *
 * Since: 2.22
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 */
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GSocketProtocol
g_socket_get_protocol (GSocket *socket)
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{
  g_return_val_if_fail (G_IS_SOCKET (socket), -1);

  return socket->priv->protocol;
}

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/**
 * g_socket_get_fd:
 * @socket: a #GSocket.
 *
 * Returns the underlying OS socket object. On unix this
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 * is a socket file descriptor, and on Windows this is
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 * a Winsock2 SOCKET handle. This may be useful for
 * doing platform specific or otherwise unusual operations
 * on the socket.
 *
 * Returns: the file descriptor of the socket.
 *
 * Since: 2.22
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 */
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int
g_socket_get_fd (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), -1);

  return socket->priv->fd;
}

/**
 * g_socket_get_local_address:
 * @socket: a #GSocket.
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Try to get the local address of a bound socket. This is only
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 * useful if the socket has been bound to a local address,
 * either explicitly or implicitly when connecting.
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 *
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 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
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 *     Free the returned object with g_object_unref().
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 *
 * Since: 2.22
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 */
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GSocketAddress *
g_socket_get_local_address (GSocket  *socket,
			    GError