/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Authors: Christian Kellner <gicmo@gnome.org>
* Samuel Cormier-Iijima <sciyoshi@gmail.com>
*/
#include <config.h>
#include <glib.h>
#include <string.h>
#include "gunixsocketaddress.h"
#include "gsocketconnectable.h"
#include "glibintl.h"
#include "gnetworking.h"
/**
* SECTION:gunixsocketaddress
* @short_description: UNIX GSocketAddress
* @include: gio/gunixsocketaddress.h
*
* Support for UNIX-domain (also known as local) sockets.
*
* UNIX domain sockets are generally visible in the filesystem.
* However, some systems support abstract socket names which are not
* visible in the filesystem and not affected by the filesystem
* permissions, visibility, etc. Currently this is only supported
* under Linux. If you attempt to use abstract sockets on other
* systems, function calls may return %G_IO_ERROR_NOT_SUPPORTED
* errors. You can use g_unix_socket_address_abstract_names_supported()
* to see if abstract names are supported.
*
* Note that `<gio/gunixsocketaddress.h>` belongs to the UNIX-specific GIO
* interfaces, thus you have to use the `gio-unix-2.0.pc` pkg-config file
* when using it.
*/
/**
* GUnixSocketAddress:
*
* A UNIX-domain (local) socket address, corresponding to a
* struct sockaddr_un.
*/
enum
{
PROP_0,
PROP_PATH,
PROP_PATH_AS_ARRAY,
PROP_ABSTRACT,
PROP_ADDRESS_TYPE
};
#define UNIX_PATH_MAX sizeof (((struct sockaddr_un *) 0)->sun_path)
struct _GUnixSocketAddressPrivate
{
char path[UNIX_PATH_MAX]; /* Not including the initial zero in abstract case, so
we can guarantee zero termination of abstract
pathnames in the get_path() API */
gsize path_len; /* Not including any terminating zeros */
GUnixSocketAddressType address_type;
};
static void g_unix_socket_address_connectable_iface_init (GSocketConnectableIface *iface);
static gchar *g_unix_socket_address_connectable_to_string (GSocketConnectable *connectable);
G_DEFINE_TYPE_WITH_CODE (GUnixSocketAddress, g_unix_socket_address, G_TYPE_SOCKET_ADDRESS,
G_ADD_PRIVATE (GUnixSocketAddress)
G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
g_unix_socket_address_connectable_iface_init))
static void
g_unix_socket_address_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);
const char *str;
GByteArray *array;
gsize len;
switch (prop_id)
{
case PROP_PATH:
str = g_value_get_string (value);
if (str)
{
g_strlcpy (address->priv->path, str,
sizeof (address->priv->path));
address->priv->path_len = strlen (address->priv->path);
}
break;
case PROP_PATH_AS_ARRAY:
array = g_value_get_boxed (value);
if (array)
{
/* Clip to fit in UNIX_PATH_MAX with zero termination or first byte */
len = MIN (array->len, UNIX_PATH_MAX-1);
if (len != 0)
memcpy (address->priv->path, array->data, len);
address->priv->path[len] = 0; /* Ensure null-terminated */
address->priv->path_len = len;
}
break;
case PROP_ABSTRACT:
/* Only set it if it's not the default... */
if (g_value_get_boolean (value))
address->priv->address_type = G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED;
break;
case PROP_ADDRESS_TYPE:
/* Only set it if it's not the default... */
if (g_value_get_enum (value) != G_UNIX_SOCKET_ADDRESS_PATH)
address->priv->address_type = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_unix_socket_address_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);
GByteArray *array;
switch (prop_id)
{
case PROP_PATH:
g_value_set_string (value, address->priv->path);
break;
case PROP_PATH_AS_ARRAY:
array = g_byte_array_sized_new (address->priv->path_len);
g_byte_array_append (array, (guint8 *)address->priv->path, address->priv->path_len);
g_value_take_boxed (value, array);
break;
case PROP_ABSTRACT:
g_value_set_boolean (value, (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||
address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED));
break;
case PROP_ADDRESS_TYPE:
g_value_set_enum (value, address->priv->address_type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static GSocketFamily
g_unix_socket_address_get_family (GSocketAddress *address)
{
g_assert (PF_UNIX == G_SOCKET_FAMILY_UNIX);
return G_SOCKET_FAMILY_UNIX;
}
static gssize
g_unix_socket_address_get_native_size (GSocketAddress *address)
{
GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);
switch (addr->priv->address_type)
{
case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:
return G_STRUCT_OFFSET(struct sockaddr_un, sun_path);
case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
return G_STRUCT_OFFSET(struct sockaddr_un, sun_path) + addr->priv->path_len + 1;
default:
return sizeof (struct sockaddr_un);
}
}
static gboolean
g_unix_socket_address_to_native (GSocketAddress *address,
gpointer dest,
gsize destlen,
GError **error)
{
GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);
struct sockaddr_un *sock;
gssize socklen;
socklen = g_unix_socket_address_get_native_size (address);
if (destlen < socklen)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE,
_("Not enough space for socket address"));
return FALSE;
}
sock = (struct sockaddr_un *) dest;
memset (sock, 0, socklen);
sock->sun_family = AF_UNIX;
switch (addr->priv->address_type)
{
case G_UNIX_SOCKET_ADDRESS_INVALID:
case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:
break;
case G_UNIX_SOCKET_ADDRESS_PATH:
strcpy (sock->sun_path, addr->priv->path);
break;
case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
case G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED:
if (!g_unix_socket_address_abstract_names_supported ())
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Abstract UNIX domain socket addresses not supported on this system"));
return FALSE;
}
sock->sun_path[0] = 0;
memcpy (sock->sun_path+1, addr->priv->path, addr->priv->path_len);
break;
}
return TRUE;
}
static void
g_unix_socket_address_class_init (GUnixSocketAddressClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GSocketAddressClass *gsocketaddress_class = G_SOCKET_ADDRESS_CLASS (klass);
gobject_class->set_property = g_unix_socket_address_set_property;
gobject_class->get_property = g_unix_socket_address_get_property;
gsocketaddress_class->get_family = g_unix_socket_address_get_family;
gsocketaddress_class->to_native = g_unix_socket_address_to_native;
gsocketaddress_class->get_native_size = g_unix_socket_address_get_native_size;
g_object_class_install_property (gobject_class,
PROP_PATH,
g_param_spec_string ("path",
P_("Path"),
P_("UNIX socket path"),
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PATH_AS_ARRAY,
g_param_spec_boxed ("path-as-array",
P_("Path array"),
P_("UNIX socket path, as byte array"),
G_TYPE_BYTE_ARRAY,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
/**
* GUnixSocketAddress:abstract:
*
* Whether or not this is an abstract address
*
* Deprecated: Use #GUnixSocketAddress:address-type, which
* distinguishes between zero-padded and non-zero-padded
* abstract addresses.
*/
g_object_class_install_property (gobject_class, PROP_ABSTRACT,
g_param_spec_boolean ("abstract",
P_("Abstract"),
P_("Whether or not this is an abstract address"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ADDRESS_TYPE,
g_param_spec_enum ("address-type",
P_("Address type"),
P_("The type of UNIX socket address"),
G_TYPE_UNIX_SOCKET_ADDRESS_TYPE,
G_UNIX_SOCKET_ADDRESS_PATH,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
g_unix_socket_address_connectable_iface_init (GSocketConnectableIface *iface)
{
GSocketConnectableIface *parent_iface = g_type_interface_peek_parent (iface);
iface->enumerate = parent_iface->enumerate;
iface->proxy_enumerate = parent_iface->proxy_enumerate;
iface->to_string = g_unix_socket_address_connectable_to_string;
}
static gchar *
g_unix_socket_address_connectable_to_string (GSocketConnectable *connectable)
{
GUnixSocketAddress *ua;
GString *out;
const gchar *path;
gsize path_len, i;
ua = G_UNIX_SOCKET_ADDRESS (connectable);
/* Anonymous sockets have no path. */
if (ua->priv->address_type == G_UNIX_SOCKET_ADDRESS_ANONYMOUS)
return g_strdup ("anonymous");
path = g_unix_socket_address_get_path (ua);
path_len = g_unix_socket_address_get_path_len (ua);
out = g_string_sized_new (path_len);
/* Return the #GUnixSocketAddress:path, but with all non-printable characters
* (including nul bytes) escaped to hex. */
for (i = 0; i < path_len; i++)
{
guint8 c = path[i];
if (g_ascii_isprint (path[i]))
g_string_append_c (out, c);
else
g_string_append_printf (out, "\\x%02x", (guint) c);
}
return g_string_free (out, FALSE);
}
static void
g_unix_socket_address_init (GUnixSocketAddress *address)
{
address->priv = g_unix_socket_address_get_instance_private (address);
memset (address->priv->path, 0, sizeof (address->priv->path));
address->priv->path_len = -1;
address->priv->address_type = G_UNIX_SOCKET_ADDRESS_PATH;
}
/**
* g_unix_socket_address_new:
* @path: the socket path
*
* Creates a new #GUnixSocketAddress for @path.
*
* To create abstract socket addresses, on systems that support that,
* use g_unix_socket_address_new_abstract().
*
* Returns: a new #GUnixSocketAddress
*
* Since: 2.22
*/
GSocketAddress *
g_unix_socket_address_new (const gchar *path)
{
return g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,
"path", path,
"abstract", FALSE,
NULL);
}
/**
* g_unix_socket_address_new_abstract:
* @path: (array length=path_len) (element-type gchar): the abstract name
* @path_len: the length of @path, or -1
*
* Creates a new %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED
* #GUnixSocketAddress for @path.
*
* Returns: a new #GUnixSocketAddress
*
* Deprecated: Use g_unix_socket_address_new_with_type().
*/
GSocketAddress *
g_unix_socket_address_new_abstract (const gchar *path,
gint path_len)
{
return g_unix_socket_address_new_with_type (path, path_len,
G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);
}
/**
* g_unix_socket_address_new_with_type:
* @path: (array length=path_len) (element-type gchar): the name
* @path_len: the length of @path, or -1
* @type: a #GUnixSocketAddressType
*
* Creates a new #GUnixSocketAddress of type @type with name @path.
*
* If @type is %G_UNIX_SOCKET_ADDRESS_PATH, this is equivalent to
* calling g_unix_socket_address_new().
*
* If @type is %G_UNIX_SOCKET_ADDRESS_ANONYMOUS, @path and @path_len will be
* ignored.
*
* If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT, then @path_len
* bytes of @path will be copied to the socket's path, and only those
* bytes will be considered part of the name. (If @path_len is -1,
* then @path is assumed to be NUL-terminated.) For example, if @path
* was "test", then calling g_socket_address_get_native_size() on the
* returned socket would return 7 (2 bytes of overhead, 1 byte for the
* abstract-socket indicator byte, and 4 bytes for the name "test").
*
* If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED, then
* @path_len bytes of @path will be copied to the socket's path, the
* rest of the path will be padded with 0 bytes, and the entire
* zero-padded buffer will be considered the name. (As above, if
* @path_len is -1, then @path is assumed to be NUL-terminated.) In
* this case, g_socket_address_get_native_size() will always return
* the full size of a `struct sockaddr_un`, although
* g_unix_socket_address_get_path_len() will still return just the
* length of @path.
*
* %G_UNIX_SOCKET_ADDRESS_ABSTRACT is preferred over
* %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED for new programs. Of course,
* when connecting to a server created by another process, you must
* use the appropriate type corresponding to how that process created
* its listening socket.
*
* Returns: a new #GUnixSocketAddress
*
* Since: 2.26
*/
GSocketAddress *
g_unix_socket_address_new_with_type (const gchar *path,
gint path_len,
GUnixSocketAddressType type)
{
GSocketAddress *address;
GByteArray *array;
if (type == G_UNIX_SOCKET_ADDRESS_ANONYMOUS)
path_len = 0;
else if (path_len == -1)
path_len = strlen (path);
array = g_byte_array_sized_new (path_len);
g_byte_array_append (array, (guint8 *)path, path_len);
address = g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,
"path-as-array", array,
"address-type", type,
NULL);
g_byte_array_unref (array);
return address;
}
/**
* g_unix_socket_address_get_path:
* @address: a #GInetSocketAddress
*
* Gets @address's path, or for abstract sockets the "name".
*
* Guaranteed to be zero-terminated, but an abstract socket
* may contain embedded zeros, and thus you should use
* g_unix_socket_address_get_path_len() to get the true length
* of this string.
*
* Returns: the path for @address
*
* Since: 2.22
*/
const char *
g_unix_socket_address_get_path (GUnixSocketAddress *address)
{
return address->priv->path;
}
/**
* g_unix_socket_address_get_path_len:
* @address: a #GInetSocketAddress
*
* Gets the length of @address's path.
*
* For details, see g_unix_socket_address_get_path().
*
* Returns: the length of the path
*
* Since: 2.22
*/
gsize
g_unix_socket_address_get_path_len (GUnixSocketAddress *address)
{
return address->priv->path_len;
}
/**
* g_unix_socket_address_get_address_type:
* @address: a #GInetSocketAddress
*
* Gets @address's type.
*
* Returns: a #GUnixSocketAddressType
*
* Since: 2.26
*/
GUnixSocketAddressType
g_unix_socket_address_get_address_type (GUnixSocketAddress *address)
{
return address->priv->address_type;
}
/**
* g_unix_socket_address_get_is_abstract:
* @address: a #GInetSocketAddress
*
* Tests if @address is abstract.
*
* Returns: %TRUE if the address is abstract, %FALSE otherwise
*
* Since: 2.22
*
* Deprecated: Use g_unix_socket_address_get_address_type()
*/
gboolean
g_unix_socket_address_get_is_abstract (GUnixSocketAddress *address)
{
return (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||
address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);
}
/**
* g_unix_socket_address_abstract_names_supported:
*
* Checks if abstract UNIX domain socket names are supported.
*
* Returns: %TRUE if supported, %FALSE otherwise
*
* Since: 2.22
*/
gboolean
g_unix_socket_address_abstract_names_supported (void)
{
#ifdef __linux__
return TRUE;
#else
return FALSE;
#endif
}