/* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima * Copyright © 2009 Codethink Limited * Copyright © 2009 Red Hat, Inc * * 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 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General * Public License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. * * Authors: Christian Kellner * Samuel Cormier-Iijima * Ryan Lortie * Alexander Larsson */ #include "config.h" #include "glib.h" #include #include #include #include #ifndef G_OS_WIN32 # include # include #endif #ifdef HAVE_SYS_UIO_H #include #endif #include "gsocket.h" #include "gcancellable.h" #include "gioenumtypes.h" #include "ginetaddress.h" #include "ginitable.h" #include "gioerror.h" #include "gioenums.h" #include "gioerror.h" #include "gnetworkingprivate.h" #include "gsocketaddress.h" #include "gsocketcontrolmessage.h" #include "glibintl.h" #include "gioalias.h" /** * SECTION:gsocket * @short_description: Low-level socket object * @include: gio/gio.h * @see_also: #GInitable * * 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. * It supports both the UNIX socket implementations and winsock2 on Windows. * * #GSocket is the platform independent base upon which the higher level * network primitives are based. Applications are not typically meant to * use it directly, but rather through classes like #GSocketClient, * #GSocketService and #GSocketConnection. However there may be cases where * direct use of #GSocket is useful. * * #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 * in blocking mode all operations block until the requested operation * 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. * * #GSockets can be either connection oriented or datagram based. * 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. * * 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. * * Since: 2.22 */ static void g_socket_initable_iface_init (GInitableIface *iface); static gboolean g_socket_initable_init (GInitable *initable, GCancellable *cancellable, GError **error); G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT, G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, g_socket_initable_iface_init)); enum { PROP_0, PROP_FAMILY, PROP_TYPE, PROP_PROTOCOL, PROP_FD, PROP_BLOCKING, PROP_LISTEN_BACKLOG, PROP_KEEPALIVE, PROP_LOCAL_ADDRESS, PROP_REMOTE_ADDRESS, PROP_TIMEOUT }; struct _GSocketPrivate { GSocketFamily family; GSocketType type; GSocketProtocol protocol; gint fd; gint listen_backlog; guint timeout; GError *construct_error; guint inited : 1; guint blocking : 1; guint keepalive : 1; guint closed : 1; guint connected : 1; guint listening : 1; guint timed_out : 1; #ifdef G_OS_WIN32 WSAEVENT event; int current_events; int current_errors; int selected_events; GList *requested_conditions; /* list of requested GIOCondition * */ #endif }; 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) { #ifndef G_OS_WIN32 return g_io_error_from_errno (err); #else switch (err) { case WSAEADDRINUSE: return G_IO_ERROR_ADDRESS_IN_USE; case WSAEWOULDBLOCK: return G_IO_ERROR_WOULD_BLOCK; case WSAEACCES: return G_IO_ERROR_PERMISSION_DENIED; case WSA_INVALID_HANDLE: case WSA_INVALID_PARAMETER: case WSAEBADF: case WSAENOTSOCK: return G_IO_ERROR_INVALID_ARGUMENT; case WSAEPROTONOSUPPORT: return G_IO_ERROR_NOT_SUPPORTED; case WSAECANCELLED: return G_IO_ERROR_CANCELLED; case WSAESOCKTNOSUPPORT: case WSAEOPNOTSUPP: case WSAEPFNOSUPPORT: case WSAEAFNOSUPPORT: return G_IO_ERROR_NOT_SUPPORTED; default: return G_IO_ERROR_FAILED; } #endif } static const char * socket_strerror (int err) { #ifndef G_OS_WIN32 return g_strerror (err); #else static GStaticPrivate last_msg = G_STATIC_PRIVATE_INIT; char *msg; msg = g_win32_error_message (err); g_static_private_set (&last_msg, msg, g_free); return msg; #endif } #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) { socket->priv->current_events &= ~mask; socket->priv->current_errors &= ~mask; } #else #define win32_unset_event_mask(_socket, _mask) #endif static void set_fd_nonblocking (int fd) { #ifndef G_OS_WIN32 glong arg; #else gulong arg; #endif #ifndef G_OS_WIN32 if ((arg = fcntl (fd, F_GETFL, NULL)) < 0) { g_warning ("Error getting socket status flags: %s", socket_strerror (errno)); arg = 0; } arg = arg | O_NONBLOCK; if (fcntl (fd, F_SETFL, arg) < 0) g_warning ("Error setting socket status flags: %s", socket_strerror (errno)); #else arg = TRUE; if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR) { int errsv = get_socket_errno (); g_warning ("Error setting socket status flags: %s", socket_strerror (errsv)); } #endif } static gboolean check_socket (GSocket *socket, GError **error) { if (!socket->priv->inited) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED, _("Invalid socket, not initialized")); 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; } 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; } return TRUE; } static void g_socket_details_from_fd (GSocket *socket) { struct sockaddr_storage address; gint fd; guint addrlen; guint optlen; int value; int errsv; #ifdef G_OS_WIN32 /* See bug #611756 */ BOOL bool_val = FALSE; #else int bool_val; #endif fd = socket->priv->fd; optlen = sizeof value; if (getsockopt (fd, SOL_SOCKET, SO_TYPE, (void *)&value, &optlen) != 0) { errsv = get_socket_errno (); switch (errsv) { #ifdef ENOTSOCK case ENOTSOCK: #endif #ifdef WSAENOTSOCK case WSAENOTSOCK: #endif case EBADF: /* programmer error */ g_error ("creating GSocket from fd %d: %s\n", fd, socket_strerror (errsv)); default: break; } goto err; } g_assert (optlen == sizeof value); 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; } g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) + sizeof address.ss_family <= addrlen); switch (address.ss_family) { case G_SOCKET_FAMILY_IPV4: case G_SOCKET_FAMILY_IPV6: case G_SOCKET_FAMILY_UNIX: socket->priv->family = address.ss_family; break; default: socket->priv->family = G_SOCKET_FAMILY_INVALID; break; } if (socket->priv->family != G_SOCKET_FAMILY_INVALID) { addrlen = sizeof address; if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0) socket->priv->connected = TRUE; } optlen = sizeof bool_val; if (getsockopt (fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&bool_val, &optlen) == 0) { #ifndef G_OS_WIN32 /* Experimentation indicates that the SO_KEEPALIVE value is * actually a char on Windows, even if documentation claims it * to be a BOOL which is a typedef for int. So this g_assert() * fails. See bug #611756. */ g_assert (optlen == sizeof bool_val); #endif socket->priv->keepalive = !!bool_val; } 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)); } static gint g_socket_create_socket (GSocketFamily family, GSocketType type, int protocol, GError **error) { gint native_type; gint fd; 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 (); } if (protocol == -1) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("Unable to create socket: %s"), _("Unknown protocol was specified")); return -1; } #ifdef SOCK_CLOEXEC native_type |= SOCK_CLOEXEC; #endif fd = socket (family, native_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)); } #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; } 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); /* 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 */ if (socket->priv->fd != -1) set_fd_nonblocking (socket->priv->fd); } static void g_socket_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GSocket *socket = G_SOCKET (object); GSocketAddress *address; 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: g_value_set_enum (value, socket->priv->protocol); 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: address = g_socket_get_local_address (socket, NULL); g_value_take_object (value, address); break; case PROP_REMOTE_ADDRESS: address = g_socket_get_remote_address (socket, NULL); g_value_take_object (value, address); break; case PROP_TIMEOUT: g_value_set_uint (value, socket->priv->timeout); break; 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: socket->priv->protocol = g_value_get_enum (value); 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; case PROP_TIMEOUT: g_socket_set_timeout (socket, g_value_get_uint (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void g_socket_finalize (GObject *object) { GSocket *socket = G_SOCKET (object); g_clear_error (&socket->priv->construct_error); if (socket->priv->fd != -1 && !socket->priv->closed) g_socket_close (socket, NULL); #ifdef G_OS_WIN32 if (socket->priv->event != WSA_INVALID_EVENT) { WSACloseEvent (socket->priv->event); socket->priv->event = WSA_INVALID_EVENT; } g_assert (socket->priv->requested_conditions == NULL); #endif 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); volatile GType type; /* Make sure winsock has been initialized */ type = g_inet_address_get_type (); #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. */ signal (SIGPIPE, SIG_IGN); #endif g_type_class_add_private (klass, sizeof (GSocketPrivate)); 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, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PROTOCOL, g_param_spec_enum ("protocol", P_("Socket protocol"), P_("The id of the protocol to use, or -1 for unknown"), G_TYPE_SOCKET_PROTOCOL, G_SOCKET_PROTOCOL_UNKNOWN, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG, g_param_spec_int ("listen-backlog", P_("Listen backlog"), P_("Outstanding connections in the listen queue"), 0, SOMAXCONN, 10, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); 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, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * 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)); } static void g_socket_initable_iface_init (GInitableIface *iface) { iface->init = g_socket_initable_init; } static void g_socket_init (GSocket *socket) { socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate); 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; #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) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, _("Cancellable initialization not supported")); 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; } /** * g_socket_new: * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4. * @type: the socket type to use. * @protocol: the id of the protocol to use, or 0 for default. * @error: #GError for error reporting, or %NULL to ignore. * * Creates a new #GSocket with the defined family, type and protocol. * 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. * * 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. * * Returns: a #GSocket or %NULL on error. * Free the returned object with g_object_unref(). * * Since: 2.22 */ GSocket * g_socket_new (GSocketFamily family, GSocketType type, GSocketProtocol protocol, GError **error) { return G_SOCKET (g_initable_new (G_TYPE_SOCKET, NULL, error, "family", family, "type", type, "protocol", protocol, 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. * * Returns: a #GSocket or %NULL on error. * Free the returned object with g_object_unref(). * * Since: 2.22 */ GSocket * g_socket_new_from_fd (gint fd, 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 * all operations block until they succeed or there is an error. In * 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 */ 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 */ 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. * @keepalive: Value for the keepalive flag * * 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. * * 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. * * Since: 2.22 */ void g_socket_set_keepalive (GSocket *socket, gboolean keepalive) { int value; g_return_if_fail (G_IS_SOCKET (socket)); keepalive = !!keepalive; if (socket->priv->keepalive == keepalive) return; value = (gint) keepalive; if (setsockopt (socket->priv->fd, SOL_SOCKET, SO_KEEPALIVE, (gpointer) &value, sizeof (value)) < 0) { int errsv = get_socket_errno (); g_warning ("error setting keepalive: %s", socket_strerror (errsv)); 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 */ 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 */ gint g_socket_get_listen_backlog (GSocket *socket) { 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. * * Note that this must be called before g_socket_listen() and has no * effect if called after that. * * Since: 2.22 */ void g_socket_set_listen_backlog (GSocket *socket, gint backlog) { g_return_if_fail (G_IS_SOCKET (socket)); g_return_if_fail (!socket->priv->listening); if (backlog != socket->priv->listen_backlog) { socket->priv->listen_backlog = backlog; g_object_notify (G_OBJECT (socket), "listen-backlog"); } } /** * 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"); } } /** * g_socket_get_family: * @socket: a #GSocket. * * Gets the socket family of the socket. * * Returns: a #GSocketFamily * * Since: 2.22 */ 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 */ 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; } /** * g_socket_get_protocol: * @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 */ GSocketProtocol g_socket_get_protocol (GSocket *socket) { g_return_val_if_fail (G_IS_SOCKET (socket), -1); return socket->priv->protocol; } /** * g_socket_get_fd: * @socket: a #GSocket. * * Returns the underlying OS socket object. On unix this * is a socket file descriptor, and on windows this is * 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 */ 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 * useful if the socket has been bound to a local address, * either explicitly or implicitly when connecting. * * Returns: a #GSocketAddress or %NULL on error. * Free the returned object with g_object_unref(). * * Since: 2.22 */ GSocketAddress * g_socket_get_local_address (GSocket *socket, GError **error) { struct sockaddr_storage buffer; guint32 len = sizeof (buffer); g_return_val_if_fail (G_IS_SOCKET (socket), NULL); if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("could not get local address: %s"), socket_strerror (errsv)); return NULL; } return g_socket_address_new_from_native (&buffer, len); } /** * g_socket_get_remote_address: * @socket: a #GSocket. * @error: #GError for error reporting, or %NULL to ignore. * * Try to get the remove address of a connected socket. This is only * useful for connection oriented sockets that have been connected. * * Returns: a #GSocketAddress or %NULL on error. * Free the returned object with g_object_unref(). * * Since: 2.22 */ GSocketAddress * g_socket_get_remote_address (GSocket *socket, GError **error) { struct sockaddr_storage buffer; guint32 len = sizeof (buffer); g_return_val_if_fail (G_IS_SOCKET (socket), NULL); if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("could not get remote address: %s"), socket_strerror (errsv)); return NULL; } return g_socket_address_new_from_native (&buffer, len); } /** * g_socket_is_connected: * @socket: a #GSocket. * * Check whether the socket is connected. This is only useful for * connection-oriented sockets. * * Returns: %TRUE if socket is connected, %FALSE otherwise. * * Since: 2.22 */ gboolean g_socket_is_connected (GSocket *socket) { g_return_val_if_fail (G_IS_SOCKET (socket), FALSE); return socket->priv->connected; } /** * g_socket_listen: * @socket: a #GSocket. * @error: #GError for error reporting, or %NULL to ignore. * * Marks the socket as a server socket, i.e. a socket that is used * to accept incoming requests using g_socket_accept(). * * Before calling this the socket must be bound to a local address using * g_socket_bind(). * * To set the maximum amount of outstanding clients, use * g_socket_set_listen_backlog(). * * Returns: %TRUE on success, %FALSE on error. * * Since: 2.22 */ gboolean g_socket_listen (GSocket *socket, GError **error) { g_return_val_if_fail (G_IS_SOCKET (socket), FALSE); if (!check_socket (socket, error)) return FALSE; if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("could not listen: %s"), socket_strerror (errsv)); return FALSE; } socket->priv->listening = TRUE; return TRUE; } /** * g_socket_bind: * @socket: a #GSocket. * @address: a #GSocketAddress specifying the local address. * @allow_reuse: whether to allow reusing this address * @error: #GError for error reporting, or %NULL to ignore. * * When a socket is created it is attached to an address family, but it * doesn't have an address in this family. g_socket_bind() assigns the * address (sometimes called name) of the socket. * * It is generally required to bind to a local address before you can * receive connections. (See g_socket_listen() and g_socket_accept() ). * In certain situations, you may also want to bind a socket that will be * used to initiate connections, though this is not normally required. * * @allow_reuse should be %TRUE for server sockets (sockets that you will * eventually call g_socket_accept() on), and %FALSE for client sockets. * (Specifically, if it is %TRUE, then g_socket_bind() will set the * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if * that address was previously used by another socket that has not yet been * fully cleaned-up by the kernel. Failing to set this flag on a server * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if * the server program is stopped and then immediately restarted.) * * Returns: %TRUE on success, %FALSE on error. * * Since: 2.22 */ gboolean g_socket_bind (GSocket *socket, GSocketAddress *address, gboolean reuse_address, GError **error) { struct sockaddr_storage addr; g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE); if (!check_socket (socket, error)) return FALSE; /* SO_REUSEADDR on windows means something else and is not what we want. It always allows the unix variant of SO_REUSEADDR anyway */ #ifndef G_OS_WIN32 { int value; value = (int) !!reuse_address; /* Ignore errors here, the only likely error is "not supported", and this is a "best effort" thing mainly */ setsockopt (socket->priv->fd, SOL_SOCKET, SO_REUSEADDR, (gpointer) &value, sizeof (value)); } #endif if (!g_socket_address_to_native (address, &addr, sizeof addr, error)) return FALSE; if (bind (socket->priv->fd, (struct sockaddr *) &addr, g_socket_address_get_native_size (address)) < 0) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error binding to address: %s"), socket_strerror (errsv)); return FALSE; } return TRUE; } /** * g_socket_speaks_ipv4: * @socket: a #GSocket * * Checks if a socket is capable of speaking IPv4. * * IPv4 sockets are capable of speaking IPv4. On some operating systems * and under some combinations of circumstances IPv6 sockets are also * capable of speaking IPv4. See RFC 3493 section 3.7 for more * information. * * No other types of sockets are currently considered as being capable * of speaking IPv4. * * Returns: %TRUE if this socket can be used with IPv4. * * Since: 2.22 **/ gboolean g_socket_speaks_ipv4 (GSocket *socket) { switch (socket->priv->family) { case G_SOCKET_FAMILY_IPV4: return TRUE; case G_SOCKET_FAMILY_IPV6: #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY) { guint sizeof_int = sizeof (int); gint v6_only; if (getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_V6ONLY, &v6_only, &sizeof_int) != 0) return FALSE; return !v6_only; } #else return FALSE; #endif default: return FALSE; } } /** * g_socket_accept: * @socket: a #GSocket. * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Accept incoming connections on a connection-based socket. This removes * the first outstanding connection request from the listening socket and * creates a #GSocket object for it. * * The @socket must be bound to a local address with g_socket_bind() and * must be listening for incoming connections (g_socket_listen()). * * If there are no outstanding connections then the operation will block * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled. * To be notified of an incoming connection, wait for the %G_IO_IN condition. * * Returns: a new #GSocket, or %NULL on error. * Free the returned object with g_object_unref(). * * Since: 2.22 */ GSocket * g_socket_accept (GSocket *socket, GCancellable *cancellable, GError **error) { GSocket *new_socket; gint ret; g_return_val_if_fail (G_IS_SOCKET (socket), NULL); if (!check_socket (socket, error)) return NULL; while (TRUE) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_IN, cancellable, error)) return NULL; if ((ret = accept (socket->priv->fd, NULL, 0)) < 0) { int errsv = get_socket_errno (); win32_unset_event_mask (socket, FD_ACCEPT); if (errsv == EINTR) continue; if (socket->priv->blocking) { #ifdef WSAEWOULDBLOCK if (errsv == WSAEWOULDBLOCK) continue; #else if (errsv == EWOULDBLOCK || errsv == EAGAIN) continue; #endif } g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error accepting connection: %s"), socket_strerror (errsv)); return NULL; } break; } win32_unset_event_mask (socket, FD_ACCEPT); #ifdef G_OS_WIN32 { /* The socket inherits the accepting sockets event mask and even object, we need to remove that */ WSAEventSelect (ret, NULL, 0); } #else { 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 (ret, F_GETFD, 0); if (flags != -1 && (flags & FD_CLOEXEC) == 0) { flags |= FD_CLOEXEC; fcntl (ret, F_SETFD, flags); } } #endif new_socket = g_socket_new_from_fd (ret, error); if (new_socket == NULL) { #ifdef G_OS_WIN32 closesocket (ret); #else close (ret); #endif } else new_socket->priv->protocol = socket->priv->protocol; return new_socket; } /** * g_socket_connect: * @socket: a #GSocket. * @address: a #GSocketAddress specifying the remote address. * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Connect the socket to the specified remote address. * * For connection oriented socket this generally means we attempt to make * a connection to the @address. For a connection-less socket it sets * the default address for g_socket_send() and discards all incoming datagrams * from other sources. * * Generally connection oriented sockets can only connect once, but * connection-less sockets can connect multiple times to change the * default address. * * If the connect call needs to do network I/O it will block, unless * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned * and the user can be notified of the connection finishing by waiting * for the G_IO_OUT condition. The result of the connection can then be * checked with g_socket_check_connect_result(). * * Returns: %TRUE if connected, %FALSE on error. * * Since: 2.22 */ gboolean g_socket_connect (GSocket *socket, GSocketAddress *address, GCancellable *cancellable, GError **error) { struct sockaddr_storage buffer; g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE); if (!check_socket (socket, error)) return FALSE; if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error)) return FALSE; while (1) { if (connect (socket->priv->fd, (struct sockaddr *) &buffer, g_socket_address_get_native_size (address)) < 0) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; #ifndef G_OS_WIN32 if (errsv == EINPROGRESS) #else if (errsv == WSAEWOULDBLOCK) #endif { if (socket->priv->blocking) { if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error)) { if (g_socket_check_connect_result (socket, error)) break; } g_prefix_error (error, _("Error connecting: ")); } else g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING, _("Connection in progress")); } else g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error connecting: %s"), socket_strerror (errsv)); return FALSE; } break; } win32_unset_event_mask (socket, FD_CONNECT); socket->priv->connected = TRUE; return TRUE; } /** * g_socket_check_connect_result: * @socket: a #GSocket * @error: #GError for error reporting, or %NULL to ignore. * * Checks and resets the pending connect error for the socket. * This is used to check for errors when g_socket_connect() is * used in non-blocking mode. * * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error * * Since: 2.22 */ gboolean g_socket_check_connect_result (GSocket *socket, GError **error) { guint optlen; int value; if (!check_socket (socket, error)) return FALSE; optlen = sizeof (value); if (getsockopt (socket->priv->fd, SOL_SOCKET, SO_ERROR, (void *)&value, &optlen) != 0) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Unable to get pending error: %s"), socket_strerror (errsv)); return FALSE; } if (value != 0) { g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value), socket_strerror (value)); return FALSE; } return TRUE; } /** * g_socket_receive: * @socket: a #GSocket * @buffer: a buffer to read data into (which should be at least @size * bytes long). * @size: the number of bytes you want to read from the socket * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Receive data (up to @size bytes) from a socket. This is mainly used by * connection-oriented sockets; it is identical to g_socket_receive_from() * with @address set to %NULL. * * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets, * g_socket_receive() will always read either 0 or 1 complete messages from * the socket. If the received message is too large to fit in @buffer, then * the data beyond @size bytes will be discarded, without any explicit * indication that this has occurred. * * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any * number of bytes, up to @size. If more than @size bytes have been * received, the additional data will be returned in future calls to * g_socket_receive(). * * If the socket is in blocking mode the call will block until there is * some data to receive or there is an error. If there is no data available * and the socket is in non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error * will be returned. To be notified when data is available, wait for the * %G_IO_IN condition. * * On error -1 is returned and @error is set accordingly. * * Returns: Number of bytes read, or -1 on error * * Since: 2.22 */ gssize g_socket_receive (GSocket *socket, gchar *buffer, gsize size, GCancellable *cancellable, GError **error) { gssize ret; g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, FALSE); if (!check_socket (socket, error)) return -1; if (g_cancellable_set_error_if_cancelled (cancellable, error)) return -1; while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_IN, cancellable, error)) return -1; if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; if (socket->priv->blocking) { #ifdef WSAEWOULDBLOCK if (errsv == WSAEWOULDBLOCK) continue; #else if (errsv == EWOULDBLOCK || errsv == EAGAIN) continue; #endif } win32_unset_event_mask (socket, FD_READ); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error receiving data: %s"), socket_strerror (errsv)); return -1; } win32_unset_event_mask (socket, FD_READ); break; } return ret; } /** * g_socket_receive_from: * @socket: a #GSocket * @address: a pointer to a #GSocketAddress pointer, or %NULL * @buffer: a buffer to read data into (which should be at least @size * bytes long). * @size: the number of bytes you want to read from the socket * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Receive data (up to @size bytes) from a socket. * * If @address is non-%NULL then @address will be set equal to the * source address of the received packet. * @address is owned by the caller. * * See g_socket_receive() for additional information. * * Returns: Number of bytes read, or -1 on error * * Since: 2.22 */ gssize g_socket_receive_from (GSocket *socket, GSocketAddress **address, gchar *buffer, gsize size, GCancellable *cancellable, GError **error) { GInputVector v; v.buffer = buffer; v.size = size; return g_socket_receive_message (socket, address, &v, 1, NULL, 0, NULL, cancellable, error); } /* Although we ignore SIGPIPE, gdb will still stop if the app receives * one, which can be confusing and annoying. So if possible, we want * to suppress the signal entirely. */ #ifdef MSG_NOSIGNAL #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL #else #define G_SOCKET_DEFAULT_SEND_FLAGS 0 #endif /** * g_socket_send: * @socket: a #GSocket * @buffer: the buffer containing the data to send. * @size: the number of bytes to send * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Tries to send @size bytes from @buffer on the socket. This is * mainly used by connection-oriented sockets; it is identical to * g_socket_send_to() with @address set to %NULL. * * If the socket is in blocking mode the call will block until there is * space for the data in the socket queue. If there is no space available * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error * will be returned. To be notified when space is available, wait for the * %G_IO_OUT condition. Note though that you may still receive * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously * notified of a %G_IO_OUT condition. (On Windows in particular, this is * very common due to the way the underlying APIs work.) * * On error -1 is returned and @error is set accordingly. * * Returns: Number of bytes written (which may be less than @size), or -1 * on error * * Since: 2.22 */ gssize g_socket_send (GSocket *socket, const gchar *buffer, gsize size, GCancellable *cancellable, GError **error) { gssize ret; g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, FALSE); if (!check_socket (socket, error)) return -1; if (g_cancellable_set_error_if_cancelled (cancellable, error)) return -1; while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_OUT, cancellable, error)) return -1; if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; #ifdef WSAEWOULDBLOCK if (errsv == WSAEWOULDBLOCK) win32_unset_event_mask (socket, FD_WRITE); #endif if (socket->priv->blocking) { #ifdef WSAEWOULDBLOCK if (errsv == WSAEWOULDBLOCK) continue; #else if (errsv == EWOULDBLOCK || errsv == EAGAIN) continue; #endif } g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error sending data: %s"), socket_strerror (errsv)); return -1; } break; } return ret; } /** * g_socket_send_to: * @socket: a #GSocket * @address: a #GSocketAddress, or %NULL * @buffer: the buffer containing the data to send. * @size: the number of bytes to send * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Tries to send @size bytes from @buffer to @address. If @address is * %NULL then the message is sent to the default receiver (set by * g_socket_connect()). * * See g_socket_send() for additional information. * * Returns: Number of bytes written (which may be less than @size), or -1 * on error * * Since: 2.22 */ gssize g_socket_send_to (GSocket *socket, GSocketAddress *address, const gchar *buffer, gsize size, GCancellable *cancellable, GError **error) { GOutputVector v; v.buffer = buffer; v.size = size; return g_socket_send_message (socket, address, &v, 1, NULL, 0, 0, cancellable, error); } /** * g_socket_shutdown: * @socket: a #GSocket * @shutdown_read: whether to shut down the read side * @shutdown_write: whether to shut down the write side * @error: #GError for error reporting, or %NULL to ignore. * * Shut down part of a full-duplex connection. * * If @shutdown_read is %TRUE then the recieving side of the connection * is shut down, and further reading is disallowed. * * If @shutdown_write is %TRUE then the sending side of the connection * is shut down, and further writing is disallowed. * * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE. * * One example where this is used is graceful disconnect for TCP connections * where you close the sending side, then wait for the other side to close * the connection, thus ensuring that the other side saw all sent data. * * Returns: %TRUE on success, %FALSE on error * * Since: 2.22 */ gboolean g_socket_shutdown (GSocket *socket, gboolean shutdown_read, gboolean shutdown_write, GError **error) { int how; g_return_val_if_fail (G_IS_SOCKET (socket), TRUE); if (!check_socket (socket, NULL)) return FALSE; /* Do nothing? */ if (!shutdown_read && !shutdown_write) return TRUE; #ifndef G_OS_WIN32 if (shutdown_read && shutdown_write) how = SHUT_RDWR; else if (shutdown_read) how = SHUT_RD; else how = SHUT_WR; #else if (shutdown_read && shutdown_write) how = SD_BOTH; else if (shutdown_read) how = SD_RECEIVE; else how = SD_SEND; #endif if (shutdown (socket->priv->fd, how) != 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)); return FALSE; } if (shutdown_read && shutdown_write) socket->priv->connected = FALSE; return TRUE; } /** * g_socket_close: * @socket: a #GSocket * @error: #GError for error reporting, or %NULL to ignore. * * Closes the socket, shutting down any active connection. * * Closing a socket does not wait for all outstanding I/O operations * to finish, so the caller should not rely on them to be guaranteed * to complete even if the close returns with no error. * * Once the socket is closed, all other operations will return * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not * return an error. * * Sockets will be automatically closed when the last reference * is dropped, but you might want to call this function to make sure * resources are released as early as possible. * * Beware that due to the way that TCP works, it is possible for * recently-sent data to be lost if either you close a socket while the * %G_IO_IN condition is set, or else if the remote connection tries to * send something to you after you close the socket but before it has * finished reading all of the data you sent. There is no easy generic * way to avoid this problem; the easiest fix is to design the network * protocol such that the client will never send data "out of turn". * Another solution is for the server to half-close the connection by * calling g_socket_shutdown() with only the @shutdown_write flag set, * and then wait for the client to notice this and close its side of the * connection, after which the server can safely call g_socket_close(). * (This is what #GTcpConnection does if you call * g_tcp_connection_set_graceful_disconnect(). But of course, this * only works if the client will close its connection after the server * does.) * * Returns: %TRUE on success, %FALSE on error * * Since: 2.22 */ gboolean g_socket_close (GSocket *socket, GError **error) { int res; g_return_val_if_fail (G_IS_SOCKET (socket), TRUE); if (socket->priv->closed) return TRUE; /* Multiple close not an error */ if (!check_socket (socket, NULL)) return FALSE; while (1) { #ifdef G_OS_WIN32 res = closesocket (socket->priv->fd); #else res = close (socket->priv->fd); #endif if (res == -1) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error closing socket: %s"), socket_strerror (errsv)); return FALSE; } break; } socket->priv->connected = FALSE; socket->priv->closed = TRUE; return TRUE; } /** * g_socket_is_closed: * @socket: a #GSocket * * Checks whether a socket is closed. * * Returns: %TRUE if socket is closed, %FALSE otherwise * * Since: 2.22 */ gboolean g_socket_is_closed (GSocket *socket) { return socket->priv->closed; } #ifdef G_OS_WIN32 /* Broken source, used on errors */ static gboolean broken_prepare (GSource *source, gint *timeout) { return FALSE; } static gboolean broken_check (GSource *source) { return FALSE; } static gboolean broken_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { return TRUE; } static GSourceFuncs broken_funcs = { broken_prepare, broken_check, broken_dispatch, NULL }; static gint network_events_for_condition (GIOCondition condition) { int event_mask = 0; if (condition & G_IO_IN) event_mask |= (FD_READ | FD_ACCEPT); if (condition & G_IO_OUT) event_mask |= (FD_WRITE | FD_CONNECT); event_mask |= FD_CLOSE; return event_mask; } static void ensure_event (GSocket *socket) { if (socket->priv->event == WSA_INVALID_EVENT) socket->priv->event = WSACreateEvent(); } static void update_select_events (GSocket *socket) { int event_mask; GIOCondition *ptr; GList *l; WSAEVENT event; ensure_event (socket); event_mask = 0; for (l = socket->priv->requested_conditions; l != NULL; l = l->next) { ptr = l->data; event_mask |= network_events_for_condition (*ptr); } if (event_mask != socket->priv->selected_events) { /* If no events selected, disable event so we can unset nonblocking mode */ if (event_mask == 0) event = NULL; else event = socket->priv->event; if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0) socket->priv->selected_events = event_mask; } } static void add_condition_watch (GSocket *socket, GIOCondition *condition) { g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL); socket->priv->requested_conditions = g_list_prepend (socket->priv->requested_conditions, condition); update_select_events (socket); } static void remove_condition_watch (GSocket *socket, GIOCondition *condition) { g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL); socket->priv->requested_conditions = g_list_remove (socket->priv->requested_conditions, condition); update_select_events (socket); } static GIOCondition update_condition (GSocket *socket) { WSANETWORKEVENTS events; GIOCondition condition; if (WSAEnumNetworkEvents (socket->priv->fd, socket->priv->event, &events) == 0) { socket->priv->current_events |= events.lNetworkEvents; if (events.lNetworkEvents & FD_WRITE && events.iErrorCode[FD_WRITE_BIT] != 0) socket->priv->current_errors |= FD_WRITE; if (events.lNetworkEvents & FD_CONNECT && events.iErrorCode[FD_CONNECT_BIT] != 0) socket->priv->current_errors |= FD_CONNECT; } condition = 0; if (socket->priv->current_events & (FD_READ | FD_ACCEPT)) condition |= G_IO_IN; if (socket->priv->current_events & FD_CLOSE || socket->priv->closed) condition |= G_IO_HUP; /* Never report both G_IO_OUT and HUP, these are mutually exclusive (can't write to a closed socket) */ if ((condition & G_IO_HUP) == 0 && socket->priv->current_events & FD_WRITE) { if (socket->priv->current_errors & FD_WRITE) condition |= G_IO_ERR; else condition |= G_IO_OUT; } else { if (socket->priv->current_events & FD_CONNECT) { if (socket->priv->current_errors & FD_CONNECT) condition |= (G_IO_HUP | G_IO_ERR); else condition |= G_IO_OUT; } } return condition; } #endif typedef struct { GSource source; GPollFD pollfd; GSocket *socket; GIOCondition condition; GCancellable *cancellable; GPollFD cancel_pollfd; GTimeVal timeout_time; } GSocketSource; static gboolean socket_source_prepare (GSource *source, gint *timeout) { GSocketSource *socket_source = (GSocketSource *)source; if (g_cancellable_is_cancelled (socket_source->cancellable)) return TRUE; if (socket_source->timeout_time.tv_sec) { GTimeVal now; g_source_get_current_time (source, &now); *timeout = ((socket_source->timeout_time.tv_sec - now.tv_sec) * 1000 + (socket_source->timeout_time.tv_usec - now.tv_usec) / 1000); if (*timeout < 0) { socket_source->socket->priv->timed_out = TRUE; socket_source->pollfd.revents = socket_source->condition & (G_IO_IN | G_IO_OUT); return TRUE; } } else *timeout = -1; #ifdef G_OS_WIN32 socket_source->pollfd.revents = update_condition (socket_source->socket); #endif if ((socket_source->condition & socket_source->pollfd.revents) != 0) return TRUE; return FALSE; } static gboolean socket_source_check (GSource *source) { int timeout; return socket_source_prepare (source, &timeout); } static gboolean socket_source_dispatch (GSource *source, GSourceFunc callback, gpointer user_data) { GSocketSourceFunc func = (GSocketSourceFunc)callback; GSocketSource *socket_source = (GSocketSource *)source; return (*func) (socket_source->socket, socket_source->pollfd.revents & socket_source->condition, user_data); } static void socket_source_finalize (GSource *source) { GSocketSource *socket_source = (GSocketSource *)source; GSocket *socket; socket = socket_source->socket; #ifdef G_OS_WIN32 remove_condition_watch (socket, &socket_source->condition); #endif g_object_unref (socket); if (socket_source->cancellable) { g_cancellable_release_fd (socket_source->cancellable); g_object_unref (socket_source->cancellable); } } static GSourceFuncs socket_source_funcs = { socket_source_prepare, socket_source_check, socket_source_dispatch, socket_source_finalize }; static GSource * socket_source_new (GSocket *socket, GIOCondition condition, GCancellable *cancellable) { GSource *source; GSocketSource *socket_source; #ifdef G_OS_WIN32 ensure_event (socket); if (socket->priv->event == WSA_INVALID_EVENT) { g_warning ("Failed to create WSAEvent"); return g_source_new (&broken_funcs, sizeof (GSource)); } #endif condition |= G_IO_HUP | G_IO_ERR; source = g_source_new (&socket_source_funcs, sizeof (GSocketSource)); socket_source = (GSocketSource *)source; socket_source->socket = g_object_ref (socket); socket_source->condition = condition; if (g_cancellable_make_pollfd (cancellable, &socket_source->cancel_pollfd)) { socket_source->cancellable = g_object_ref (cancellable); g_source_add_poll (source, &socket_source->cancel_pollfd); } #ifdef G_OS_WIN32 add_condition_watch (socket, &socket_source->condition); socket_source->pollfd.fd = (gintptr) socket->priv->event; #else socket_source->pollfd.fd = socket->priv->fd; #endif socket_source->pollfd.events = condition; socket_source->pollfd.revents = 0; g_source_add_poll (source, &socket_source->pollfd); if (socket->priv->timeout) { g_get_current_time (&socket_source->timeout_time); socket_source->timeout_time.tv_sec += socket->priv->timeout; } else { socket_source->timeout_time.tv_sec = 0; socket_source->timeout_time.tv_usec = 0; } return source; } /** * g_socket_create_source: * @socket: a #GSocket * @condition: a #GIOCondition mask to monitor * @cancellable: a %GCancellable or %NULL * * Creates a %GSource that can be attached to a %GMainContext to monitor * for the availibility of the specified @condition on the socket. * * The callback on the source is of the #GSocketSourceFunc type. * * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition; * these conditions will always be reported output if they are true. * * @cancellable if not %NULL can be used to cancel the source, which will * cause the source to trigger, reporting the current condition (which * is likely 0 unless cancellation happened at the same time as a * condition change). You can check for this in the callback using * g_cancellable_is_cancelled(). * * If @socket has a timeout set, and it is reached before @condition * occurs, the source will then trigger anyway, reporting %G_IO_IN or * %G_IO_OUT depending on @condition. However, @socket will have been * marked as having had a timeout, and so the next #GSocket I/O method * you call will then fail with a %G_IO_ERROR_TIMED_OUT. * * Returns: a newly allocated %GSource, free with g_source_unref(). * * Since: 2.22 */ GSource * g_socket_create_source (GSocket *socket, GIOCondition condition, GCancellable *cancellable) { g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL); return socket_source_new (socket, condition, cancellable); } /** * g_socket_condition_check: * @socket: a #GSocket * @condition: a #GIOCondition mask to check * * Checks on the readiness of @socket to perform operations. * The operations specified in @condition are checked for and masked * against the currently-satisfied conditions on @socket. The result * is returned. * * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition; * these conditions will always be set in the output if they are true. * * This call never blocks. * * Returns: the @GIOCondition mask of the current state * * Since: 2.22 */ GIOCondition g_socket_condition_check (GSocket *socket, GIOCondition condition) { if (!check_socket (socket, NULL)) return 0; #ifdef G_OS_WIN32 { GIOCondition current_condition; condition |= G_IO_ERR | G_IO_HUP; add_condition_watch (socket, &condition); current_condition = update_condition (socket); remove_condition_watch (socket, &condition); return condition & current_condition; } #else { GPollFD poll_fd; gint result; poll_fd.fd = socket->priv->fd; poll_fd.events = condition; do result = g_poll (&poll_fd, 1, 0); while (result == -1 && get_socket_errno () == EINTR); return poll_fd.revents; } #endif } /** * g_socket_condition_wait: * @socket: a #GSocket * @condition: a #GIOCondition mask to wait for * @cancellable: a #GCancellable, or %NULL * @error: a #GError pointer, or %NULL * * Waits for @condition to become true on @socket. When the condition * is met, %TRUE is returned. * * If @cancellable is cancelled before the condition is met, or if the * socket has a timeout set and it is reached before the condition is * met, then %FALSE is returned and @error, if non-%NULL, is set to * the appropriate value (%G_IO_ERROR_CANCELLED or * %G_IO_ERROR_TIMED_OUT). * * Returns: %TRUE if the condition was met, %FALSE otherwise * * Since: 2.22 */ gboolean g_socket_condition_wait (GSocket *socket, GIOCondition condition, GCancellable *cancellable, GError **error) { if (!check_socket (socket, error)) return FALSE; if (g_cancellable_set_error_if_cancelled (cancellable, error)) return FALSE; #ifdef G_OS_WIN32 { GIOCondition current_condition; WSAEVENT events[2]; DWORD res, timeout; GPollFD cancel_fd; int num_events; /* Always check these */ condition |= G_IO_ERR | G_IO_HUP; add_condition_watch (socket, &condition); num_events = 0; events[num_events++] = socket->priv->event; if (g_cancellable_make_pollfd (cancellable, &cancel_fd)) events[num_events++] = (WSAEVENT)cancel_fd.fd; if (socket->priv->timeout) timeout = socket->priv->timeout * 1000; else timeout = WSA_INFINITE; current_condition = update_condition (socket); while ((condition & current_condition) == 0) { res = WSAWaitForMultipleEvents(num_events, events, FALSE, timeout, FALSE); if (res == WSA_WAIT_FAILED) { int errsv = get_socket_errno (); g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Waiting for socket condition: %s"), socket_strerror (errsv)); break; } else if (res == WSA_WAIT_TIMEOUT) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT, _("Socket I/O timed out")); break; } if (g_cancellable_set_error_if_cancelled (cancellable, error)) break; current_condition = update_condition (socket); } remove_condition_watch (socket, &condition); if (num_events > 1) g_cancellable_release_fd (cancellable); return (condition & current_condition) != 0; } #else { GPollFD poll_fd[2]; gint result; gint num; gint timeout; poll_fd[0].fd = socket->priv->fd; poll_fd[0].events = condition; num = 1; if (g_cancellable_make_pollfd (cancellable, &poll_fd[1])) num++; if (socket->priv->timeout) timeout = socket->priv->timeout * 1000; else timeout = -1; do result = g_poll (poll_fd, num, timeout); while (result == -1 && get_socket_errno () == EINTR); if (num > 1) g_cancellable_release_fd (cancellable); if (result == 0) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT, _("Socket I/O timed out")); return FALSE; } return !g_cancellable_set_error_if_cancelled (cancellable, error); } #endif } /** * g_socket_send_message: * @socket: a #GSocket * @address: a #GSocketAddress, or %NULL * @vectors: an array of #GOutputVector structs * @num_vectors: the number of elements in @vectors, or -1 * @messages: a pointer to an array of #GSocketControlMessages, or * %NULL. * @num_messages: number of elements in @messages, or -1. * @flags: an int containing #GSocketMsgFlags flags * @cancellable: a %GCancellable or %NULL * @error: #GError for error reporting, or %NULL to ignore. * * Send data to @address on @socket. This is the most complicated and * fully-featured version of this call. For easier use, see * g_socket_send() and g_socket_send_to(). * * If @address is %NULL then the message is sent to the default receiver * (set by g_socket_connect()). * * @vectors must point to an array of #GOutputVector structs and * @num_vectors must be the length of this array. (If @num_vectors is -1, * then @vectors is assumed to be terminated by a #GOutputVector with a * %NULL buffer pointer.) The #GOutputVector structs describe the buffers * that the sent data will be gathered from. Using multiple * #GOutputVectors is more memory-efficient than manually copying * data from multiple sources into a single buffer, and more * network-efficient than making multiple calls to g_socket_send(). * * @messages, if non-%NULL, is taken to point to an array of @num_messages * #GSocketControlMessage instances. These correspond to the control * messages to be sent on the socket. * If @num_messages is -1 then @messages is treated as a %NULL-terminated * array. * * @flags modify how the message is sent. The commonly available arguments * for this are available in the #GSocketMsgFlags enum, but the * values there are the same as the system values, and the flags * are passed in as-is, so you can pass in system-specific flags too. * * If the socket is in blocking mode the call will block until there is * space for the data in the socket queue. If there is no space available * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error * will be returned. To be notified when space is available, wait for the * %G_IO_OUT condition. Note though that you may still receive * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously * notified of a %G_IO_OUT condition. (On Windows in particular, this is * very common due to the way the underlying APIs work.) * * On error -1 is returned and @error is set accordingly. * * Returns: Number of bytes written (which may be less than @size), or -1 * on error * * Since: 2.22 */ gssize g_socket_send_message (GSocket *socket, GSocketAddress *address, GOutputVector *vectors, gint num_vectors, GSocketControlMessage **messages, gint num_messages, gint flags, GCancellable *cancellable, GError **error) { GOutputVector one_vector; char zero; if (!check_socket (socket, error)) return -1; if (g_cancellable_set_error_if_cancelled (cancellable, error)) return -1; if (num_vectors == -1) { for (num_vectors = 0; vectors[num_vectors].buffer != NULL; num_vectors++) ; } if (num_messages == -1) { for (num_messages = 0; messages != NULL && messages[num_messages] != NULL; num_messages++) ; } if (num_vectors == 0) { zero = '\0'; one_vector.buffer = &zero; one_vector.size = 1; num_vectors = 1; vectors = &one_vector; } #ifndef G_OS_WIN32 { struct msghdr msg; gssize result; /* name */ if (address) { msg.msg_namelen = g_socket_address_get_native_size (address); msg.msg_name = g_alloca (msg.msg_namelen); if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error)) return -1; } else { msg.msg_name = NULL; msg.msg_namelen = 0; } /* iov */ { /* this entire expression will be evaluated at compile time */ if (sizeof *msg.msg_iov == sizeof *vectors && sizeof msg.msg_iov->iov_base == sizeof vectors->buffer && G_STRUCT_OFFSET (struct iovec, iov_base) == G_STRUCT_OFFSET (GOutputVector, buffer) && sizeof msg.msg_iov->iov_len == sizeof vectors->size && G_STRUCT_OFFSET (struct iovec, iov_len) == G_STRUCT_OFFSET (GOutputVector, size)) /* ABI is compatible */ { msg.msg_iov = (struct iovec *) vectors; msg.msg_iovlen = num_vectors; } else /* ABI is incompatible */ { gint i; msg.msg_iov = g_newa (struct iovec, num_vectors); for (i = 0; i < num_vectors; i++) { msg.msg_iov[i].iov_base = (void *) vectors[i].buffer; msg.msg_iov[i].iov_len = vectors[i].size; } msg.msg_iovlen = num_vectors; } } /* control */ { struct cmsghdr *cmsg; gint i; msg.msg_controllen = 0; for (i = 0; i < num_messages; i++) msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i])); msg.msg_control = g_alloca (msg.msg_controllen); cmsg = CMSG_FIRSTHDR (&msg); for (i = 0; i < num_messages; i++) { cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]); cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]); cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i])); g_socket_control_message_serialize (messages[i], CMSG_DATA (cmsg)); cmsg = CMSG_NXTHDR (&msg, cmsg); } g_assert (cmsg == NULL); } while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_OUT, cancellable, error)) return -1; result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS); if (result < 0) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; if (socket->priv->blocking && (errsv == EWOULDBLOCK || errsv == EAGAIN)) continue; g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error sending message: %s"), socket_strerror (errsv)); return -1; } break; } return result; } #else { struct sockaddr_storage addr; guint addrlen; DWORD bytes_sent; int result; WSABUF *bufs; gint i; /* Win32 doesn't support control messages. Actually this is possible for raw and datagram sockets via WSASendMessage on Vista or later, but that doesn't seem very useful */ if (num_messages != 0) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, _("GSocketControlMessage not supported on windows")); return -1; } /* iov */ bufs = g_newa (WSABUF, num_vectors); for (i = 0; i < num_vectors; i++) { bufs[i].buf = (char *)vectors[i].buffer; bufs[i].len = (gulong)vectors[i].size; } /* name */ addrlen = 0; /* Avoid warning */ if (address) { addrlen = g_socket_address_get_native_size (address); if (!g_socket_address_to_native (address, &addr, sizeof addr, error)) return -1; } while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_OUT, cancellable, error)) return -1; if (address) result = WSASendTo (socket->priv->fd, bufs, num_vectors, &bytes_sent, flags, (const struct sockaddr *)&addr, addrlen, NULL, NULL); else result = WSASend (socket->priv->fd, bufs, num_vectors, &bytes_sent, flags, NULL, NULL); if (result != 0) { int errsv = get_socket_errno (); if (errsv == WSAEINTR) continue; if (errsv == WSAEWOULDBLOCK) win32_unset_event_mask (socket, FD_WRITE); if (socket->priv->blocking && errsv == WSAEWOULDBLOCK) continue; g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error sending message: %s"), socket_strerror (errsv)); return -1; } break; } return bytes_sent; } #endif } /** * g_socket_receive_message: * @socket: a #GSocket * @address: a pointer to a #GSocketAddress pointer, or %NULL * @vectors: an array of #GInputVector structs * @num_vectors: the number of elements in @vectors, or -1 * @messages: a pointer which may be filled with an array of * #GSocketControlMessages, or %NULL * @num_messages: a pointer which will be filled with the number of * elements in @messages, or %NULL * @flags: a pointer to an int containing #GSocketMsgFlags flags * @cancellable: a %GCancellable or %NULL * @error: a #GError pointer, or %NULL * * Receive data from a socket. This is the most complicated and * fully-featured version of this call. For easier use, see * g_socket_receive() and g_socket_receive_from(). * * If @address is non-%NULL then @address will be set equal to the * source address of the received packet. * @address is owned by the caller. * * @vector must point to an array of #GInputVector structs and * @num_vectors must be the length of this array. These structs * describe the buffers that received data will be scattered into. * If @num_vectors is -1, then @vectors is assumed to be terminated * by a #GInputVector with a %NULL buffer pointer. * * As a special case, if @num_vectors is 0 (in which case, @vectors * may of course be %NULL), then a single byte is received and * discarded. This is to facilitate the common practice of sending a * single '\0' byte for the purposes of transferring ancillary data. * * @messages, if non-%NULL, will be set to point to a newly-allocated * array of #GSocketControlMessage instances or %NULL if no such * messages was received. These correspond to the control messages * received from the kernel, one #GSocketControlMessage per message * from the kernel. This array is %NULL-terminated and must be freed * by the caller using g_free() after calling g_object_unref() on each * element. If @messages is %NULL, any control messages received will * be discarded. * * @num_messages, if non-%NULL, will be set to the number of control * messages received. * * If both @messages and @num_messages are non-%NULL, then * @num_messages gives the number of #GSocketControlMessage instances * in @messages (ie: not including the %NULL terminator). * * @flags is an in/out parameter. The commonly available arguments * for this are available in the #GSocketMsgFlags enum, but the * values there are the same as the system values, and the flags * are passed in as-is, so you can pass in system-specific flags too * (and g_socket_receive_message() may pass system-specific flags out). * * As with g_socket_receive(), data may be discarded if @socket is * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not * provide enough buffer space to read a complete message. You can pass * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without * removing it from the receive queue, but there is no portable way to find * out the length of the message other than by reading it into a * sufficiently-large buffer. * * If the socket is in blocking mode the call will block until there * is some data to receive or there is an error. If there is no data * available and the socket is in non-blocking mode, a * %G_IO_ERROR_WOULD_BLOCK error will be returned. To be notified when * data is available, wait for the %G_IO_IN condition. * * On error -1 is returned and @error is set accordingly. * * Returns: Number of bytes read, or -1 on error * * Since: 2.22 */ gssize g_socket_receive_message (GSocket *socket, GSocketAddress **address, GInputVector *vectors, gint num_vectors, GSocketControlMessage ***messages, gint *num_messages, gint *flags, GCancellable *cancellable, GError **error) { GInputVector one_vector; char one_byte; if (!check_socket (socket, error)) return -1; if (g_cancellable_set_error_if_cancelled (cancellable, error)) return -1; if (num_vectors == -1) { for (num_vectors = 0; vectors[num_vectors].buffer != NULL; num_vectors++) ; } if (num_vectors == 0) { one_vector.buffer = &one_byte; one_vector.size = 1; num_vectors = 1; vectors = &one_vector; } #ifndef G_OS_WIN32 { struct msghdr msg; gssize result; struct sockaddr_storage one_sockaddr; /* name */ if (address) { msg.msg_name = &one_sockaddr; msg.msg_namelen = sizeof (struct sockaddr_storage); } else { msg.msg_name = NULL; msg.msg_namelen = 0; } /* iov */ /* this entire expression will be evaluated at compile time */ if (sizeof *msg.msg_iov == sizeof *vectors && sizeof msg.msg_iov->iov_base == sizeof vectors->buffer && G_STRUCT_OFFSET (struct iovec, iov_base) == G_STRUCT_OFFSET (GInputVector, buffer) && sizeof msg.msg_iov->iov_len == sizeof vectors->size && G_STRUCT_OFFSET (struct iovec, iov_len) == G_STRUCT_OFFSET (GInputVector, size)) /* ABI is compatible */ { msg.msg_iov = (struct iovec *) vectors; msg.msg_iovlen = num_vectors; } else /* ABI is incompatible */ { gint i; msg.msg_iov = g_newa (struct iovec, num_vectors); for (i = 0; i < num_vectors; i++) { msg.msg_iov[i].iov_base = vectors[i].buffer; msg.msg_iov[i].iov_len = vectors[i].size; } msg.msg_iovlen = num_vectors; } /* control */ msg.msg_control = g_alloca (2048); msg.msg_controllen = 2048; /* flags */ if (flags != NULL) msg.msg_flags = *flags; else msg.msg_flags = 0; /* do it */ while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_IN, cancellable, error)) return -1; result = recvmsg (socket->priv->fd, &msg, msg.msg_flags); if (result < 0) { int errsv = get_socket_errno (); if (errsv == EINTR) continue; if (socket->priv->blocking && (errsv == EWOULDBLOCK || errsv == EAGAIN)) continue; g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error receiving message: %s"), socket_strerror (errsv)); return -1; } break; } /* decode address */ if (address != NULL) { if (msg.msg_namelen > 0) *address = g_socket_address_new_from_native (msg.msg_name, msg.msg_namelen); else *address = NULL; } /* decode control messages */ { GPtrArray *my_messages = NULL; const gchar *scm_pointer; struct cmsghdr *cmsg; gsize scm_size; scm_pointer = (const gchar *) msg.msg_control; scm_size = msg.msg_controllen; for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg)) { GSocketControlMessage *message; message = g_socket_control_message_deserialize (cmsg->cmsg_level, cmsg->cmsg_type, cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg), CMSG_DATA (cmsg)); if (message == NULL) /* We've already spewed about the problem in the deserialization code, so just continue */ continue; if (messages == NULL) { /* we have to do it this way if the user ignores the * messages so that we will close any received fds. */ g_object_unref (message); } else { if (my_messages == NULL) my_messages = g_ptr_array_new (); g_ptr_array_add (my_messages, message); } } if (num_messages) *num_messages = my_messages != NULL ? my_messages->len : 0; if (messages) { if (my_messages == NULL) { *messages = NULL; } else { g_ptr_array_add (my_messages, NULL); *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE); } } else { g_assert (my_messages == NULL); } } /* capture the flags */ if (flags != NULL) *flags = msg.msg_flags; return result; } #else { struct sockaddr_storage addr; int addrlen; DWORD bytes_received; DWORD win_flags; int result; WSABUF *bufs; gint i; /* iov */ bufs = g_newa (WSABUF, num_vectors); for (i = 0; i < num_vectors; i++) { bufs[i].buf = (char *)vectors[i].buffer; bufs[i].len = (gulong)vectors[i].size; } /* flags */ if (flags != NULL) win_flags = *flags; else win_flags = 0; /* do it */ while (1) { if (socket->priv->blocking && !g_socket_condition_wait (socket, G_IO_IN, cancellable, error)) return -1; addrlen = sizeof addr; if (address) result = WSARecvFrom (socket->priv->fd, bufs, num_vectors, &bytes_received, &win_flags, (struct sockaddr *)&addr, &addrlen, NULL, NULL); else result = WSARecv (socket->priv->fd, bufs, num_vectors, &bytes_received, &win_flags, NULL, NULL); if (result != 0) { int errsv = get_socket_errno (); if (errsv == WSAEINTR) continue; win32_unset_event_mask (socket, FD_READ); if (socket->priv->blocking && errsv == WSAEWOULDBLOCK) continue; g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv), _("Error receiving message: %s"), socket_strerror (errsv)); return -1; } win32_unset_event_mask (socket, FD_READ); break; } /* decode address */ if (address != NULL) { if (addrlen > 0) *address = g_socket_address_new_from_native (&addr, addrlen); else *address = NULL; } /* capture the flags */ if (flags != NULL) *flags = win_flags; if (messages != NULL) *messages = NULL; if (num_messages != NULL) *num_messages = 0; return bytes_received; } #endif } #define __G_SOCKET_C__ #include "gioaliasdef.c"