gio/gcredentials.c - third_party/glib - Git at Google

 /* GDBus - GLib D-Bus Library
  *
  * Copyright (C) 2008-2010 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.
  *
  * Author: David Zeuthen <davidz@redhat.com>
  */

 #include "config.h"

 #ifdef __FreeBSD__
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <string.h>
 #endif
 #include <stdlib.h>

 #include <gobject/gvaluecollector.h>

 #include "gcredentials.h"
 #include "gnetworkingprivate.h"
 #include "gioerror.h"

 #include "glibintl.h"

 /**
  * SECTION:gcredentials
  * @short_description: An object containing credentials
  * @include: gio/gio.h
  *
  * The #GCredentials type is a reference-counted wrapper for native
  * credentials. This information is typically used for identifying,
  * authenticating and authorizing other processes.
  *
  * Some operating systems supports looking up the credentials of the
  * remote peer of a communication endpoint - see e.g.
  * g_socket_get_credentials().
  *
  * Some operating systems supports securely sending and receiving
  * credentials over a Unix Domain Socket, see
  * #GUnixCredentialsMessage, g_unix_connection_send_credentials() and
  * g_unix_connection_receive_credentials() for details.
  *
  * On Linux, the native credential type is a <type>struct ucred</type>
  * - see the
  * <citerefentry><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry>
  * man page for details. This corresponds to
  * %G_CREDENTIALS_TYPE_LINUX_UCRED.
  *
  * On FreeBSD, the native credential type is a <type>struct cmsgcred</type>.
  * This corresponds to %G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED.
  */

 /**
  * GCredentials:
  *
  * The #GCredentials structure contains only private data and
  * should only be accessed using the provided API.
  *
  * Since: 2.26
  */
 struct _GCredentials
 {
   /*< private >*/
   GObject parent_instance;

 #ifdef __linux__
   struct ucred native;
 #elif defined(__FreeBSD__)
   struct cmsgcred native;
 #else
 #ifdef __GNUC__
 #warning Please add GCredentials support for your OS
 #endif
 #endif
 };

 /**
  * GCredentialsClass:
  *
  * Class structure for #GCredentials.
  *
  * Since: 2.26
  */
 struct _GCredentialsClass
 {
   /*< private >*/
   GObjectClass parent_class;
 };

 G_DEFINE_TYPE (GCredentials, g_credentials, G_TYPE_OBJECT);

 static void
 g_credentials_finalize (GObject *object)
 {
   G_GNUC_UNUSED GCredentials *credentials = G_CREDENTIALS (object);

   if (G_OBJECT_CLASS (g_credentials_parent_class)->finalize != NULL)
     G_OBJECT_CLASS (g_credentials_parent_class)->finalize (object);
 }


 static void
 g_credentials_class_init (GCredentialsClass *klass)
 {
   GObjectClass *gobject_class;

   gobject_class = G_OBJECT_CLASS (klass);
   gobject_class->finalize = g_credentials_finalize;
 }

 static void
 g_credentials_init (GCredentials *credentials)
 {
 #ifdef __linux__
   credentials->native.pid = getpid ();
   credentials->native.uid = geteuid ();
   credentials->native.gid = getegid ();
 #elif defined(__FreeBSD__)
   memset (&credentials->native, 0, sizeof (struct cmsgcred));
   credentials->native.cmcred_pid  = getpid ();
   credentials->native.cmcred_euid = geteuid ();
   credentials->native.cmcred_gid  = getegid ();
 #endif
 }

 /* ---------------------------------------------------------------------------------------------------- */

 /**
  * g_credentials_new:
  *
  * Creates a new #GCredentials object with credentials matching the
  * the current process.
  *
  * Returns: A #GCredentials. Free with g_object_unref().
  *
  * Since: 2.26
  */
 GCredentials *
 g_credentials_new (void)
 {
   return g_object_new (G_TYPE_CREDENTIALS, NULL);
 }

 /* ---------------------------------------------------------------------------------------------------- */

 /**
  * g_credentials_to_string:
  * @credentials: A #GCredentials object.
  *
  * Creates a human-readable textual representation of @credentials
  * that can be used in logging and debug messages. The format of the
  * returned string may change in future GLib release.
  *
  * Returns: A string that should be freed with g_free().
  *
  * Since: 2.26
  */
 gchar *
 g_credentials_to_string (GCredentials *credentials)
 {
   GString *ret;

   g_return_val_if_fail (G_IS_CREDENTIALS (credentials), NULL);

   ret = g_string_new ("GCredentials:");
 #ifdef __linux__
   g_string_append (ret, "linux-ucred:");
   if (credentials->native.pid != -1)
     g_string_append_printf (ret, "pid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.pid);
   if (credentials->native.uid != -1)
     g_string_append_printf (ret, "uid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.uid);
   if (credentials->native.gid != -1)
     g_string_append_printf (ret, "gid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.gid);
   if (ret->str[ret->len - 1] == ',')
     ret->str[ret->len - 1] = '\0';
 #elif defined(__FreeBSD__)
   g_string_append (ret, "freebsd-cmsgcred:");
   if (credentials->native.cmcred_pid != -1)
     g_string_append_printf (ret, "pid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_pid);
   if (credentials->native.cmcred_euid != -1)
     g_string_append_printf (ret, "uid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_euid);
   if (credentials->native.cmcred_gid != -1)
     g_string_append_printf (ret, "gid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_gid);
 #else
   g_string_append (ret, "unknown");
 #endif

   return g_string_free (ret, FALSE);
 }

 /* ---------------------------------------------------------------------------------------------------- */

 /**
  * g_credentials_is_same_user:
  * @credentials: A #GCredentials.
  * @other_credentials: A #GCredentials.
  * @error: Return location for error or %NULL.
  *
  * Checks if @credentials and @other_credentials is the same user.
  *
  * This operation can fail if #GCredentials is not supported on the
  * the OS.
  *
  * Returns: %TRUE if @credentials and @other_credentials has the same
  * user, %FALSE otherwise or if @error is set.
  *
  * Since: 2.26
  */
 gboolean
 g_credentials_is_same_user (GCredentials  *credentials,
                             GCredentials  *other_credentials,
                             GError       **error)
 {
   gboolean ret;

   g_return_val_if_fail (G_IS_CREDENTIALS (credentials), FALSE);
   g_return_val_if_fail (G_IS_CREDENTIALS (other_credentials), FALSE);
   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

   ret = FALSE;
 #ifdef __linux__
   if (credentials->native.uid == other_credentials->native.uid)
     ret = TRUE;
 #elif defined(__FreeBSD__)
   if (credentials->native.cmcred_euid == other_credentials->native.cmcred_euid)
     ret = TRUE;
 #else
   g_set_error_literal (error,
                        G_IO_ERROR,
                        G_IO_ERROR_NOT_SUPPORTED,
                        _("GCredentials is not implemented on this OS"));
 #endif

   return ret;
 }

 /**
  * g_credentials_get_native: (skip)
  * @credentials: A #GCredentials.
  * @native_type: The type of native credentials to get.
  *
  * Gets a pointer to native credentials of type @native_type from
  * @credentials.
  *
  * It is a programming error (which will cause an warning to be
  * logged) to use this method if there is no #GCredentials support for
  * the OS or if @native_type isn't supported by the OS.
  *
  * Returns: The pointer to native credentials or %NULL if the
  * operation there is no #GCredentials support for the OS or if
  * @native_type isn't supported by the OS. Do not free the returned
  * data, it is owned by @credentials.
  *
  * Since: 2.26
  */
 gpointer
 g_credentials_get_native (GCredentials     *credentials,
                           GCredentialsType  native_type)
 {
   gpointer ret;

   g_return_val_if_fail (G_IS_CREDENTIALS (credentials), NULL);

   ret = NULL;

 #ifdef __linux__
   if (native_type != G_CREDENTIALS_TYPE_LINUX_UCRED)
     {
       g_warning ("g_credentials_get_native: Trying to get credentials of type %d but only "
                  "G_CREDENTIALS_TYPE_LINUX_UCRED is supported.",
                  native_type);
     }
   else
     {
       ret = &credentials->native;
     }
 #elif defined(__FreeBSD__)
   if (native_type != G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED)
     {
       g_warning ("g_credentials_get_native: Trying to get credentials of type %d but only "
 		 "G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED is supported.",
 		 native_type);
     }
   else
     {
       ret = &credentials->native;
     }
 #else
   g_warning ("g_credentials_get_native: Trying to get credentials but GLib has no support "
              "for the native credentials type. Please add support.");
 #endif

   return ret;
 }

 /**
  * g_credentials_set_native:
  * @credentials: A #GCredentials.
  * @native_type: The type of native credentials to set.
  * @native: A pointer to native credentials.
  *
  * Copies the native credentials of type @native_type from @native
  * into @credentials.
  *
  * It is a programming error (which will cause an warning to be
  * logged) to use this method if there is no #GCredentials support for
  * the OS or if @native_type isn't supported by the OS.
  *
  * Since: 2.26
  */
 void
 g_credentials_set_native (GCredentials     *credentials,
                           GCredentialsType  native_type,
                           gpointer          native)
 {
 #ifdef __linux__
   if (native_type != G_CREDENTIALS_TYPE_LINUX_UCRED)
     {
       g_warning ("g_credentials_set_native: Trying to set credentials of type %d "
                  "but only G_CREDENTIALS_TYPE_LINUX_UCRED is supported.",
                  native_type);
     }
   else
     {
       memcpy (&credentials->native, native, sizeof (struct ucred));
     }
 #elif defined(__FreeBSD__)
   if (native_type != G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED)
     {
       g_warning ("g_credentials_set_native: Trying to set credentials of type %d "
 		  "but only G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED is supported.",
 		  native_type);
     }
   else
     {
       memcpy (&credentials->native, native, sizeof (struct cmsgcred));
     }
 #else
   g_warning ("g_credentials_set_native: Trying to set credentials but GLib has no support "
              "for the native credentials type. Please add support.");
 #endif
 }

 /* ---------------------------------------------------------------------------------------------------- */

 #ifdef G_OS_UNIX
 /**
  * g_credentials_get_unix_user:
  * @credentials: A #GCredentials
  * @error: Return location for error or %NULL.
  *
  * Tries to get the UNIX user identifier from @credentials. This
  * method is only available on UNIX platforms.
  *
  * This operation can fail if #GCredentials is not supported on the
  * OS or if the native credentials type does not contain information
  * about the UNIX user.
  *
  * Returns: The UNIX user identifier or -1 if @error is set.
  *
  * Since: 2.26
  */
 uid_t
 g_credentials_get_unix_user (GCredentials    *credentials,
                              GError         **error)
 {
   uid_t ret;

   g_return_val_if_fail (G_IS_CREDENTIALS (credentials), -1);
   g_return_val_if_fail (error == NULL || *error == NULL, -1);

 #ifdef __linux__
   ret = credentials->native.uid;
 #elif defined(__FreeBSD__)
   ret = credentials->native.cmcred_euid;
 #else
   ret = -1;
   g_set_error_literal (error,
                        G_IO_ERROR,
                        G_IO_ERROR_NOT_SUPPORTED,
                        _("There is no GCredentials support for your platform"));
 #endif

   return ret;
 }

 /**
  * g_credentials_set_unix_user:
  * @credentials: A #GCredentials.
  * @uid: The UNIX user identifier to set.
  * @error: Return location for error or %NULL.
  *
  * Tries to set the UNIX user identifier on @credentials. This method
  * is only available on UNIX platforms.
  *
  * This operation can fail if #GCredentials is not supported on the
  * OS or if the native credentials type does not contain information
  * about the UNIX user.
  *
  * Returns: %TRUE if @uid was set, %FALSE if error is set.
  *
  * Since: 2.26
  */
 gboolean
 g_credentials_set_unix_user (GCredentials    *credentials,
                              uid_t            uid,
                              GError         **error)
 {
   gboolean ret;

   g_return_val_if_fail (G_IS_CREDENTIALS (credentials), FALSE);
   g_return_val_if_fail (uid != -1, FALSE);
   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

   ret = FALSE;
 #ifdef __linux__
   credentials->native.uid = uid;
   ret = TRUE;
 #elif defined(__FreeBSD__)
   credentials->native.cmcred_euid = uid;
   ret = TRUE;
 #else
   g_set_error_literal (error,
                        G_IO_ERROR,
                        G_IO_ERROR_NOT_SUPPORTED,
                        _("GCredentials is not implemented on this OS"));
 #endif

   return ret;
 }
 #endif /* G_OS_UNIX */
	/* GDBus - GLib D-Bus Library
	*
	* Copyright (C) 2008-2010 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.
	*
	* Author: David Zeuthen <davidz@redhat.com>
	*/

	#include "config.h"

	#ifdef __FreeBSD__
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <string.h>
	#endif
	#include <stdlib.h>

	#include <gobject/gvaluecollector.h>

	#include "gcredentials.h"
	#include "gnetworkingprivate.h"
	#include "gioerror.h"

	#include "glibintl.h"

	/**
	* SECTION:gcredentials
	* @short_description: An object containing credentials
	* @include: gio/gio.h
	*
	* The #GCredentials type is a reference-counted wrapper for native
	* credentials. This information is typically used for identifying,
	* authenticating and authorizing other processes.
	*
	* Some operating systems supports looking up the credentials of the
	* remote peer of a communication endpoint - see e.g.
	* g_socket_get_credentials().
	*
	* Some operating systems supports securely sending and receiving
	* credentials over a Unix Domain Socket, see
	* #GUnixCredentialsMessage, g_unix_connection_send_credentials() and
	* g_unix_connection_receive_credentials() for details.
	*
	* On Linux, the native credential type is a <type>struct ucred</type>
	* - see the
	* <citerefentry><refentrytitle>unix</refentrytitle><manvolnum>7</manvolnum></citerefentry>
	* man page for details. This corresponds to
	* %G_CREDENTIALS_TYPE_LINUX_UCRED.
	*
	* On FreeBSD, the native credential type is a <type>struct cmsgcred</type>.
	* This corresponds to %G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED.
	*/

	/**
	* GCredentials:
	*
	* The #GCredentials structure contains only private data and
	* should only be accessed using the provided API.
	*
	* Since: 2.26
	*/
	struct _GCredentials
	{
	/< private >/
	GObject parent_instance;

	#ifdef __linux__
	struct ucred native;
	#elif defined(__FreeBSD__)
	struct cmsgcred native;
	#else
	#ifdef __GNUC__
	#warning Please add GCredentials support for your OS
	#endif
	#endif
	};

	/**
	* GCredentialsClass:
	*
	* Class structure for #GCredentials.
	*
	* Since: 2.26
	*/
	struct _GCredentialsClass
	{
	/< private >/
	GObjectClass parent_class;
	};

	G_DEFINE_TYPE (GCredentials, g_credentials, G_TYPE_OBJECT);

	static void
	g_credentials_finalize (GObject *object)
	{
	G_GNUC_UNUSED GCredentials *credentials = G_CREDENTIALS (object);

	if (G_OBJECT_CLASS (g_credentials_parent_class)->finalize != NULL)
	G_OBJECT_CLASS (g_credentials_parent_class)->finalize (object);
	}


	static void
	g_credentials_class_init (GCredentialsClass *klass)
	{
	GObjectClass *gobject_class;

	gobject_class = G_OBJECT_CLASS (klass);
	gobject_class->finalize = g_credentials_finalize;
	}

	static void
	g_credentials_init (GCredentials *credentials)
	{
	#ifdef __linux__
	credentials->native.pid = getpid ();
	credentials->native.uid = geteuid ();
	credentials->native.gid = getegid ();
	#elif defined(__FreeBSD__)
	memset (&credentials->native, 0, sizeof (struct cmsgcred));
	credentials->native.cmcred_pid = getpid ();
	credentials->native.cmcred_euid = geteuid ();
	credentials->native.cmcred_gid = getegid ();
	#endif
	}

	/* ---------------------------------------------------------------------------------------------------- */

	/**
	* g_credentials_new:
	*
	* Creates a new #GCredentials object with credentials matching the
	* the current process.
	*
	* Returns: A #GCredentials. Free with g_object_unref().
	*
	* Since: 2.26
	*/
	GCredentials *
	g_credentials_new (void)
	{
	return g_object_new (G_TYPE_CREDENTIALS, NULL);
	}

	/* ---------------------------------------------------------------------------------------------------- */

	/**
	* g_credentials_to_string:
	* @credentials: A #GCredentials object.
	*
	* Creates a human-readable textual representation of @credentials
	* that can be used in logging and debug messages. The format of the
	* returned string may change in future GLib release.
	*
	* Returns: A string that should be freed with g_free().
	*
	* Since: 2.26
	*/
	gchar *
	g_credentials_to_string (GCredentials *credentials)
	{
	GString *ret;

	g_return_val_if_fail (G_IS_CREDENTIALS (credentials), NULL);

	ret = g_string_new ("GCredentials:");
	#ifdef __linux__
	g_string_append (ret, "linux-ucred:");
	if (credentials->native.pid != -1)
	g_string_append_printf (ret, "pid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.pid);
	if (credentials->native.uid != -1)
	g_string_append_printf (ret, "uid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.uid);
	if (credentials->native.gid != -1)
	g_string_append_printf (ret, "gid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.gid);
	if (ret->str[ret->len - 1] == ',')
	ret->str[ret->len - 1] = '\0';
	#elif defined(__FreeBSD__)
	g_string_append (ret, "freebsd-cmsgcred:");
	if (credentials->native.cmcred_pid != -1)
	g_string_append_printf (ret, "pid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_pid);
	if (credentials->native.cmcred_euid != -1)
	g_string_append_printf (ret, "uid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_euid);
	if (credentials->native.cmcred_gid != -1)
	g_string_append_printf (ret, "gid=%" G_GINT64_FORMAT ",", (gint64) credentials->native.cmcred_gid);
	#else
	g_string_append (ret, "unknown");
	#endif

	return g_string_free (ret, FALSE);
	}

	/* ---------------------------------------------------------------------------------------------------- */

	/**
	* g_credentials_is_same_user:
	* @credentials: A #GCredentials.
	* @other_credentials: A #GCredentials.
	* @error: Return location for error or %NULL.
	*
	* Checks if @credentials and @other_credentials is the same user.
	*
	* This operation can fail if #GCredentials is not supported on the
	* the OS.
	*
	* Returns: %TRUE if @credentials and @other_credentials has the same
	* user, %FALSE otherwise or if @error is set.
	*
	* Since: 2.26
	*/
	gboolean
	g_credentials_is_same_user (GCredentials *credentials,
	GCredentials *other_credentials,
	GError **error)
	{
	gboolean ret;

	g_return_val_if_fail (G_IS_CREDENTIALS (credentials), FALSE);
	g_return_val_if_fail (G_IS_CREDENTIALS (other_credentials), FALSE);
	g_return_val_if_fail (error == NULL \|\| *error == NULL, FALSE);

	ret = FALSE;
	#ifdef __linux__
	if (credentials->native.uid == other_credentials->native.uid)
	ret = TRUE;
	#elif defined(__FreeBSD__)
	if (credentials->native.cmcred_euid == other_credentials->native.cmcred_euid)
	ret = TRUE;
	#else
	g_set_error_literal (error,
	G_IO_ERROR,
	G_IO_ERROR_NOT_SUPPORTED,
	_("GCredentials is not implemented on this OS"));
	#endif

	return ret;
	}

	/**
	* g_credentials_get_native: (skip)
	* @credentials: A #GCredentials.
	* @native_type: The type of native credentials to get.
	*
	* Gets a pointer to native credentials of type @native_type from
	* @credentials.
	*
	* It is a programming error (which will cause an warning to be
	* logged) to use this method if there is no #GCredentials support for
	* the OS or if @native_type isn't supported by the OS.
	*
	* Returns: The pointer to native credentials or %NULL if the
	* operation there is no #GCredentials support for the OS or if
	* @native_type isn't supported by the OS. Do not free the returned
	* data, it is owned by @credentials.
	*
	* Since: 2.26
	*/
	gpointer
	g_credentials_get_native (GCredentials *credentials,
	GCredentialsType native_type)
	{
	gpointer ret;

	g_return_val_if_fail (G_IS_CREDENTIALS (credentials), NULL);

	ret = NULL;

	#ifdef __linux__
	if (native_type != G_CREDENTIALS_TYPE_LINUX_UCRED)
	{
	g_warning ("g_credentials_get_native: Trying to get credentials of type %d but only "
	"G_CREDENTIALS_TYPE_LINUX_UCRED is supported.",
	native_type);
	}
	else
	{
	ret = &credentials->native;
	}
	#elif defined(__FreeBSD__)
	if (native_type != G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED)
	{
	g_warning ("g_credentials_get_native: Trying to get credentials of type %d but only "
	"G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED is supported.",
	native_type);
	}
	else
	{
	ret = &credentials->native;
	}
	#else
	g_warning ("g_credentials_get_native: Trying to get credentials but GLib has no support "
	"for the native credentials type. Please add support.");
	#endif

	return ret;
	}

	/**
	* g_credentials_set_native:
	* @credentials: A #GCredentials.
	* @native_type: The type of native credentials to set.
	* @native: A pointer to native credentials.
	*
	* Copies the native credentials of type @native_type from @native
	* into @credentials.
	*
	* It is a programming error (which will cause an warning to be
	* logged) to use this method if there is no #GCredentials support for
	* the OS or if @native_type isn't supported by the OS.
	*
	* Since: 2.26
	*/
	void
	g_credentials_set_native (GCredentials *credentials,
	GCredentialsType native_type,
	gpointer native)
	{
	#ifdef __linux__
	if (native_type != G_CREDENTIALS_TYPE_LINUX_UCRED)
	{
	g_warning ("g_credentials_set_native: Trying to set credentials of type %d "
	"but only G_CREDENTIALS_TYPE_LINUX_UCRED is supported.",
	native_type);
	}
	else
	{
	memcpy (&credentials->native, native, sizeof (struct ucred));
	}
	#elif defined(__FreeBSD__)
	if (native_type != G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED)
	{
	g_warning ("g_credentials_set_native: Trying to set credentials of type %d "
	"but only G_CREDENTIALS_TYPE_FREEBSD_CMSGCRED is supported.",
	native_type);
	}
	else
	{
	memcpy (&credentials->native, native, sizeof (struct cmsgcred));
	}
	#else
	g_warning ("g_credentials_set_native: Trying to set credentials but GLib has no support "
	"for the native credentials type. Please add support.");
	#endif
	}

	/* ---------------------------------------------------------------------------------------------------- */

	#ifdef G_OS_UNIX
	/**
	* g_credentials_get_unix_user:
	* @credentials: A #GCredentials
	* @error: Return location for error or %NULL.
	*
	* Tries to get the UNIX user identifier from @credentials. This
	* method is only available on UNIX platforms.
	*
	* This operation can fail if #GCredentials is not supported on the
	* OS or if the native credentials type does not contain information
	* about the UNIX user.
	*
	* Returns: The UNIX user identifier or -1 if @error is set.
	*
	* Since: 2.26
	*/
	uid_t
	g_credentials_get_unix_user (GCredentials *credentials,
	GError **error)
	{
	uid_t ret;

	g_return_val_if_fail (G_IS_CREDENTIALS (credentials), -1);
	g_return_val_if_fail (error == NULL \|\| *error == NULL, -1);

	#ifdef __linux__
	ret = credentials->native.uid;
	#elif defined(__FreeBSD__)
	ret = credentials->native.cmcred_euid;
	#else
	ret = -1;
	g_set_error_literal (error,
	G_IO_ERROR,
	G_IO_ERROR_NOT_SUPPORTED,
	_("There is no GCredentials support for your platform"));
	#endif

	return ret;
	}

	/**
	* g_credentials_set_unix_user:
	* @credentials: A #GCredentials.
	* @uid: The UNIX user identifier to set.
	* @error: Return location for error or %NULL.
	*
	* Tries to set the UNIX user identifier on @credentials. This method
	* is only available on UNIX platforms.
	*
	* This operation can fail if #GCredentials is not supported on the
	* OS or if the native credentials type does not contain information
	* about the UNIX user.
	*
	* Returns: %TRUE if @uid was set, %FALSE if error is set.
	*
	* Since: 2.26
	*/
	gboolean
	g_credentials_set_unix_user (GCredentials *credentials,
	uid_t uid,
	GError **error)
	{
	gboolean ret;

	g_return_val_if_fail (G_IS_CREDENTIALS (credentials), FALSE);
	g_return_val_if_fail (uid != -1, FALSE);
	g_return_val_if_fail (error == NULL \|\| *error == NULL, FALSE);

	ret = FALSE;
	#ifdef __linux__
	credentials->native.uid = uid;
	ret = TRUE;
	#elif defined(__FreeBSD__)
	credentials->native.cmcred_euid = uid;
	ret = TRUE;
	#else
	g_set_error_literal (error,
	G_IO_ERROR,
	G_IO_ERROR_NOT_SUPPORTED,
	_("GCredentials is not implemented on this OS"));
	#endif

	return ret;
	}
	#endif /* G_OS_UNIX */