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18a33f72db
If we have an input parameter (or return value) we need to use (nullable). However, if it is an (inout) or (out) parameter, (optional) is sufficient. It looks like (nullable) could be used for everything according to the Annotation documentation, but (optional) is more specific.
700 lines
23 KiB
C
700 lines
23 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2009 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gunixconnection.h"
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#include "gnetworking.h"
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#include "gsocket.h"
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#include "gsocketcontrolmessage.h"
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#include "gunixcredentialsmessage.h"
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#include "gunixfdmessage.h"
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#include "glibintl.h"
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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/**
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* SECTION:gunixconnection
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* @title: GUnixConnection
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* @short_description: A UNIX domain GSocketConnection
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* @include: gio/gunixconnection.h
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* @see_also: #GSocketConnection.
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*
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* This is the subclass of #GSocketConnection that is created
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* for UNIX domain sockets.
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*
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* It contains functions to do some of the UNIX socket specific
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* functionality like passing file descriptors.
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*
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* Note that `<gio/gunixconnection.h>` belongs to the UNIX-specific
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* GIO interfaces, thus you have to use the `gio-unix-2.0.pc`
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* pkg-config file when using it.
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*
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* Since: 2.22
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*/
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/**
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* GUnixConnection:
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*
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* #GUnixConnection is an opaque data structure and can only be accessed
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* using the following functions.
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**/
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G_DEFINE_TYPE_WITH_CODE (GUnixConnection, g_unix_connection,
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G_TYPE_SOCKET_CONNECTION,
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g_socket_connection_factory_register_type (g_define_type_id,
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G_SOCKET_FAMILY_UNIX,
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G_SOCKET_TYPE_STREAM,
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G_SOCKET_PROTOCOL_DEFAULT);
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);
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/**
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* g_unix_connection_send_fd:
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* @connection: a #GUnixConnection
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* @fd: a file descriptor
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @error: (nullable): #GError for error reporting, or %NULL to ignore.
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*
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* Passes a file descriptor to the receiving side of the
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* connection. The receiving end has to call g_unix_connection_receive_fd()
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* to accept the file descriptor.
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*
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* As well as sending the fd this also writes a single byte to the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a %TRUE on success, %NULL on error.
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*
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* Since: 2.22
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*/
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gboolean
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g_unix_connection_send_fd (GUnixConnection *connection,
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gint fd,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage *scm;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (fd >= 0, FALSE);
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scm = g_unix_fd_message_new ();
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if (!g_unix_fd_message_append_fd (G_UNIX_FD_MESSAGE (scm), fd, error))
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{
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g_object_unref (scm);
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return FALSE;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket, NULL, NULL, 0, &scm, 1, 0, cancellable, error) != 1)
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/* XXX could it 'fail' with zero? */
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{
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g_object_unref (socket);
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g_object_unref (scm);
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return FALSE;
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}
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g_object_unref (socket);
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g_object_unref (scm);
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return TRUE;
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}
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/**
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* g_unix_connection_receive_fd:
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* @connection: a #GUnixConnection
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore
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* @error: (nullable): #GError for error reporting, or %NULL to ignore
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*
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* Receives a file descriptor from the sending end of the connection.
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* The sending end has to call g_unix_connection_send_fd() for this
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* to work.
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*
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* As well as reading the fd this also reads a single byte from the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a file descriptor on success, -1 on error.
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*
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* Since: 2.22
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**/
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gint
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g_unix_connection_receive_fd (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage **scms;
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gint *fds, nfd, fd, nscm;
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GUnixFDMessage *fdmsg;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), -1);
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_receive_message (socket, NULL, NULL, 0,
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&scms, &nscm, NULL, cancellable, error) != 1)
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/* XXX it _could_ 'fail' with zero. */
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{
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g_object_unref (socket);
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return -1;
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}
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g_object_unref (socket);
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if (nscm != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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ngettext("Expecting 1 control message, got %d",
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"Expecting 1 control message, got %d",
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nscm),
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nscm);
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for (i = 0; i < nscm; i++)
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g_object_unref (scms[i]);
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g_free (scms);
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return -1;
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}
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if (!G_IS_UNIX_FD_MESSAGE (scms[0]))
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Unexpected type of ancillary data"));
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g_object_unref (scms[0]);
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g_free (scms);
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return -1;
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}
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fdmsg = G_UNIX_FD_MESSAGE (scms[0]);
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g_free (scms);
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fds = g_unix_fd_message_steal_fds (fdmsg, &nfd);
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g_object_unref (fdmsg);
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if (nfd != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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ngettext("Expecting one fd, but got %d\n",
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"Expecting one fd, but got %d\n",
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nfd),
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nfd);
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for (i = 0; i < nfd; i++)
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close (fds[i]);
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g_free (fds);
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return -1;
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}
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fd = *fds;
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g_free (fds);
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if (fd < 0)
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Received invalid fd"));
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fd = -1;
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}
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return fd;
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}
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static void
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g_unix_connection_init (GUnixConnection *connection)
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{
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}
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static void
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g_unix_connection_class_init (GUnixConnectionClass *class)
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{
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}
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/* TODO: Other stuff we might want to add are:
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void g_unix_connection_send_fd_async (GUnixConnection *connection,
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gint fd,
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gboolean close,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fds (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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GError **error);
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void g_unix_connection_send_fds_async (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fds_finish (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_receive_fd_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gint g_unix_connection_receive_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fake_credentials (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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GError **error);
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void g_unix_connection_send_fake_credentials_async (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fake_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_create_pair (GUnixConnection **one,
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GUnixConnection **two,
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GError **error);
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*/
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/**
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* g_unix_connection_send_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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* Passes the credentials of the current user the receiving side
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* of the connection. The receiving end has to call
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* g_unix_connection_receive_credentials() (or similar) to accept the
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* credentials.
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*
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* As well as sending the credentials this also writes a single NUL
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* byte to the stream, as this is required for credentials passing to
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* work on some implementations.
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*
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* Other ways to exchange credentials with a foreign peer includes the
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Returns: %TRUE on success, %FALSE if @error is set.
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*
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* Since: 2.26
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*/
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gboolean
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g_unix_connection_send_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *credentials;
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GSocketControlMessage *scm;
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GSocket *socket;
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gboolean ret;
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GOutputVector vector;
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guchar nul_byte[1] = {'\0'};
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gint num_messages;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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ret = FALSE;
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credentials = g_credentials_new ();
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vector.buffer = &nul_byte;
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vector.size = 1;
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if (g_unix_credentials_message_is_supported ())
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{
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scm = g_unix_credentials_message_new_with_credentials (credentials);
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num_messages = 1;
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}
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else
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{
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scm = NULL;
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num_messages = 0;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket,
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NULL, /* address */
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&vector,
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1,
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&scm,
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num_messages,
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G_SOCKET_MSG_NONE,
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cancellable,
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error) != 1)
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{
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g_prefix_error (error, _("Error sending credentials: "));
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goto out;
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}
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ret = TRUE;
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out:
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g_object_unref (socket);
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if (scm != NULL)
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g_object_unref (scm);
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g_object_unref (credentials);
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return ret;
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}
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static void
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send_credentials_async_thread (GTask *task,
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gpointer source_object,
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gpointer task_data,
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GCancellable *cancellable)
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{
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GError *error = NULL;
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if (g_unix_connection_send_credentials (G_UNIX_CONNECTION (source_object),
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cancellable,
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&error))
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g_task_return_boolean (task, TRUE);
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else
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g_task_return_error (task, error);
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g_object_unref (task);
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}
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/**
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* g_unix_connection_send_credentials_async:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
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* @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
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* @user_data: (closure): the data to pass to callback function
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*
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* Asynchronously send credentials.
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*
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* For more details, see g_unix_connection_send_credentials() which is
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* the synchronous version of this call.
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*
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* When the operation is finished, @callback will be called. You can then call
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* g_unix_connection_send_credentials_finish() to get the result of the operation.
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*
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* Since: 2.32
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**/
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void
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g_unix_connection_send_credentials_async (GUnixConnection *connection,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GTask *task;
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task = g_task_new (connection, cancellable, callback, user_data);
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g_task_set_source_tag (task, g_unix_connection_send_credentials_async);
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g_task_run_in_thread (task, send_credentials_async_thread);
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}
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/**
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* g_unix_connection_send_credentials_finish:
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* @connection: A #GUnixConnection.
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* @result: a #GAsyncResult.
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* @error: a #GError, or %NULL
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*
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* Finishes an asynchronous send credentials operation started with
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* g_unix_connection_send_credentials_async().
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*
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* Returns: %TRUE if the operation was successful, otherwise %FALSE.
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*
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* Since: 2.32
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**/
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gboolean
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g_unix_connection_send_credentials_finish (GUnixConnection *connection,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (g_task_is_valid (result, connection), FALSE);
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return g_task_propagate_boolean (G_TASK (result), error);
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}
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/**
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* g_unix_connection_receive_credentials:
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* @connection: A #GUnixConnection.
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* @cancellable: (nullable): A #GCancellable or %NULL.
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* @error: Return location for error or %NULL.
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*
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|
* Receives credentials from the sending end of the connection. The
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* sending end has to call g_unix_connection_send_credentials() (or
|
|
* similar) for this to work.
|
|
*
|
|
* As well as reading the credentials this also reads (and discards) a
|
|
* single byte from the stream, as this is required for credentials
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|
* passing to work on some implementations.
|
|
*
|
|
* Other ways to exchange credentials with a foreign peer includes the
|
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* #GUnixCredentialsMessage type and g_socket_get_credentials() function.
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*
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* Returns: (transfer full): Received credentials on success (free with
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* g_object_unref()), %NULL if @error is set.
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*
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* Since: 2.26
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*/
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GCredentials *
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g_unix_connection_receive_credentials (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GCredentials *ret;
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GSocketControlMessage **scms;
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gint nscm;
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GSocket *socket;
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gint n;
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gssize num_bytes_read;
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#ifdef __linux__
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gboolean turn_off_so_passcreds;
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#endif
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), NULL);
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g_return_val_if_fail (error == NULL || *error == NULL, NULL);
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ret = NULL;
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scms = NULL;
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g_object_get (connection, "socket", &socket, NULL);
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/* On Linux, we need to turn on SO_PASSCRED if it isn't enabled
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* already. We also need to turn it off when we're done. See
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* #617483 for more discussion.
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*/
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#ifdef __linux__
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{
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gint opt_val;
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turn_off_so_passcreds = FALSE;
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opt_val = 0;
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if (!g_socket_get_option (socket,
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SOL_SOCKET,
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SO_PASSCRED,
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&opt_val,
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NULL))
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{
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (errno),
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_("Error checking if SO_PASSCRED is enabled for socket: %s"),
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strerror (errno));
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goto out;
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}
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if (opt_val == 0)
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{
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if (!g_socket_set_option (socket,
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SOL_SOCKET,
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SO_PASSCRED,
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TRUE,
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NULL))
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{
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g_set_error (error,
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G_IO_ERROR,
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g_io_error_from_errno (errno),
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_("Error enabling SO_PASSCRED: %s"),
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strerror (errno));
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goto out;
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}
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turn_off_so_passcreds = TRUE;
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}
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}
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#endif
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g_type_ensure (G_TYPE_UNIX_CREDENTIALS_MESSAGE);
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|
num_bytes_read = g_socket_receive_message (socket,
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NULL, /* GSocketAddress **address */
|
|
NULL,
|
|
0,
|
|
&scms,
|
|
&nscm,
|
|
NULL,
|
|
cancellable,
|
|
error);
|
|
if (num_bytes_read != 1)
|
|
{
|
|
/* Handle situation where g_socket_receive_message() returns
|
|
* 0 bytes and not setting @error
|
|
*/
|
|
if (num_bytes_read == 0 && error != NULL && *error == NULL)
|
|
{
|
|
g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Expecting to read a single byte for receiving credentials but read zero bytes"));
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (g_unix_credentials_message_is_supported () &&
|
|
/* Fall back on get_credentials if the other side didn't send the credentials */
|
|
nscm > 0)
|
|
{
|
|
if (nscm != 1)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
ngettext("Expecting 1 control message, got %d",
|
|
"Expecting 1 control message, got %d",
|
|
nscm),
|
|
nscm);
|
|
goto out;
|
|
}
|
|
|
|
if (!G_IS_UNIX_CREDENTIALS_MESSAGE (scms[0]))
|
|
{
|
|
g_set_error_literal (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Unexpected type of ancillary data"));
|
|
goto out;
|
|
}
|
|
|
|
ret = g_unix_credentials_message_get_credentials (G_UNIX_CREDENTIALS_MESSAGE (scms[0]));
|
|
g_object_ref (ret);
|
|
}
|
|
else
|
|
{
|
|
if (nscm != 0)
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
G_IO_ERROR_FAILED,
|
|
_("Not expecting control message, but got %d"),
|
|
nscm);
|
|
goto out;
|
|
}
|
|
else
|
|
{
|
|
ret = g_socket_get_credentials (socket, error);
|
|
}
|
|
}
|
|
|
|
out:
|
|
|
|
#ifdef __linux__
|
|
if (turn_off_so_passcreds)
|
|
{
|
|
if (!g_socket_set_option (socket,
|
|
SOL_SOCKET,
|
|
SO_PASSCRED,
|
|
FALSE,
|
|
NULL))
|
|
{
|
|
g_set_error (error,
|
|
G_IO_ERROR,
|
|
g_io_error_from_errno (errno),
|
|
_("Error while disabling SO_PASSCRED: %s"),
|
|
strerror (errno));
|
|
goto out;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (scms != NULL)
|
|
{
|
|
for (n = 0; n < nscm; n++)
|
|
g_object_unref (scms[n]);
|
|
g_free (scms);
|
|
}
|
|
g_object_unref (socket);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
receive_credentials_async_thread (GTask *task,
|
|
gpointer source_object,
|
|
gpointer task_data,
|
|
GCancellable *cancellable)
|
|
{
|
|
GCredentials *creds;
|
|
GError *error = NULL;
|
|
|
|
creds = g_unix_connection_receive_credentials (G_UNIX_CONNECTION (source_object),
|
|
cancellable,
|
|
&error);
|
|
if (creds)
|
|
g_task_return_pointer (task, creds, g_object_unref);
|
|
else
|
|
g_task_return_error (task, error);
|
|
g_object_unref (task);
|
|
}
|
|
|
|
/**
|
|
* g_unix_connection_receive_credentials_async:
|
|
* @connection: A #GUnixConnection.
|
|
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
|
|
* @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
|
|
* @user_data: (closure): the data to pass to callback function
|
|
*
|
|
* Asynchronously receive credentials.
|
|
*
|
|
* For more details, see g_unix_connection_receive_credentials() which is
|
|
* the synchronous version of this call.
|
|
*
|
|
* When the operation is finished, @callback will be called. You can then call
|
|
* g_unix_connection_receive_credentials_finish() to get the result of the operation.
|
|
*
|
|
* Since: 2.32
|
|
**/
|
|
void
|
|
g_unix_connection_receive_credentials_async (GUnixConnection *connection,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer user_data)
|
|
{
|
|
GTask *task;
|
|
|
|
task = g_task_new (connection, cancellable, callback, user_data);
|
|
g_task_set_source_tag (task, g_unix_connection_receive_credentials_async);
|
|
g_task_run_in_thread (task, receive_credentials_async_thread);
|
|
}
|
|
|
|
/**
|
|
* g_unix_connection_receive_credentials_finish:
|
|
* @connection: A #GUnixConnection.
|
|
* @result: a #GAsyncResult.
|
|
* @error: a #GError, or %NULL
|
|
*
|
|
* Finishes an asynchronous receive credentials operation started with
|
|
* g_unix_connection_receive_credentials_async().
|
|
*
|
|
* Returns: (transfer full): a #GCredentials, or %NULL on error.
|
|
* Free the returned object with g_object_unref().
|
|
*
|
|
* Since: 2.32
|
|
**/
|
|
GCredentials *
|
|
g_unix_connection_receive_credentials_finish (GUnixConnection *connection,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
g_return_val_if_fail (g_task_is_valid (result, connection), NULL);
|
|
|
|
return g_task_propagate_pointer (G_TASK (result), error);
|
|
}
|