gio/gunixsocketaddress.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Authors: Christian Kellner <gicmo@gnome.org>
  21  *          Samuel Cormier-Iijima <sciyoshi@gmail.com>
  22  */
  23
  24 #include <config.h>
  25 #include <glib.h>
  26 #include <string.h>
  27
  28 #include "gunixsocketaddress.h"
  29 #include "glibintl.h"
  30 #include "gnetworking.h"
  31
  32
  33 /**
  34  * SECTION:gunixsocketaddress
  35  * @short_description: UNIX GSocketAddress
  36  * @include: gio/gunixsocketaddress.h
  37  *
  38  * Support for UNIX-domain (also known as local) sockets.
  39  *
  40  * UNIX domain sockets are generally visible in the filesystem.
  41  * However, some systems support abstract socket names which are not
  42  * visible in the filesystem and not affected by the filesystem
  43  * permissions, visibility, etc. Currently this is only supported
  44  * under Linux. If you attempt to use abstract sockets on other
  45  * systems, function calls may return %G_IO_ERROR_NOT_SUPPORTED
  46  * errors. You can use g_unix_socket_address_abstract_names_supported()
  47  * to see if abstract names are supported.
  48  *
  49  * Note that <filename>&lt;gio/gunixsocketaddress.h&gt;</filename> belongs to
  50  * the UNIX-specific GIO interfaces, thus you have to use the
  51  * <filename>gio-unix-2.0.pc</filename> pkg-config file when using it.
  52  */
  53
  54 /**
  55  * GUnixSocketAddress:
  56  *
  57  * A UNIX-domain (local) socket address, corresponding to a
  58  * <type>struct sockaddr_un</type>.
  59  */
  60
  61 enum
  62 {
  63   PROP_0,
  64   PROP_PATH,
  65   PROP_PATH_AS_ARRAY,
  66   PROP_ABSTRACT,
  67   PROP_ADDRESS_TYPE
  68 };
  69
  70 #define UNIX_PATH_MAX sizeof (((struct sockaddr_un *) 0)->sun_path)
  71
  72 struct _GUnixSocketAddressPrivate
  73 {
  74   char path[UNIX_PATH_MAX]; /* Not including the initial zero in abstract case, so
  75                                we can guarantee zero termination of abstract
  76                                pathnames in the get_path() API */
  77   gsize path_len; /* Not including any terminating zeros */
  78   GUnixSocketAddressType address_type;
  79 };
  80
  81 G_DEFINE_TYPE_WITH_PRIVATE (GUnixSocketAddress, g_unix_socket_address, G_TYPE_SOCKET_ADDRESS)
  82
  83 static void
  84 g_unix_socket_address_set_property (GObject      *object,
  85                                     guint         prop_id,
  86                                     const GValue *value,
  87                                     GParamSpec   *pspec)
  88 {
  89   GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);
  90   const char *str;
  91   GByteArray *array;
  92   gsize len;
  93
  94   switch (prop_id)
  95     {
  96     case PROP_PATH:
  97       str = g_value_get_string (value);
  98       if (str)
  99         {
 100           g_strlcpy (address->priv->path, str,
 101                      sizeof (address->priv->path));
 102           address->priv->path_len = strlen (address->priv->path);
 103         }
 104       break;
 105
 106     case PROP_PATH_AS_ARRAY:
 107       array = g_value_get_boxed (value);
 108
 109       if (array)
 110         {
 111           /* Clip to fit in UNIX_PATH_MAX with zero termination or first byte */
 112           len = MIN (array->len, UNIX_PATH_MAX-1);
 113
 114           memcpy (address->priv->path, array->data, len);
 115           address->priv->path[len] = 0; /* Ensure null-terminated */
 116           address->priv->path_len = len;
 117         }
 118       break;
 119
 120     case PROP_ABSTRACT:
 121       /* Only set it if it's not the default... */
 122       if (g_value_get_boolean (value))
 123        address->priv->address_type = G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED;
 124       break;
 125
 126     case PROP_ADDRESS_TYPE:
 127       /* Only set it if it's not the default... */
 128       if (g_value_get_enum (value) != G_UNIX_SOCKET_ADDRESS_PATH)
 129         address->priv->address_type = g_value_get_enum (value);
 130       break;
 131
 132     default:
 133       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 134     }
 135 }
 136
 137 static void
 138 g_unix_socket_address_get_property (GObject    *object,
 139                                     guint       prop_id,
 140                                     GValue     *value,
 141                                     GParamSpec *pspec)
 142 {
 143   GUnixSocketAddress *address = G_UNIX_SOCKET_ADDRESS (object);
 144   GByteArray *array;
 145
 146   switch (prop_id)
 147     {
 148       case PROP_PATH:
 149         g_value_set_string (value, address->priv->path);
 150         break;
 151
 152       case PROP_PATH_AS_ARRAY:
 153         array = g_byte_array_sized_new (address->priv->path_len);
 154         g_byte_array_append (array, (guint8 *)address->priv->path, address->priv->path_len);
 155         g_value_take_boxed (value, array);
 156         break;
 157
 158       case PROP_ABSTRACT:
 159         g_value_set_boolean (value, (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||
 160                                      address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED));
 161
 162         break;
 163
 164       case PROP_ADDRESS_TYPE:
 165         g_value_set_enum (value, address->priv->address_type);
 166         break;
 167
 168       default:
 169         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 170     }
 171 }
 172
 173 static GSocketFamily
 174 g_unix_socket_address_get_family (GSocketAddress *address)
 175 {
 176   g_assert (PF_UNIX == G_SOCKET_FAMILY_UNIX);
 177
 178   return G_SOCKET_FAMILY_UNIX;
 179 }
 180
 181 static gssize
 182 g_unix_socket_address_get_native_size (GSocketAddress *address)
 183 {
 184   GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);
 185
 186   switch (addr->priv->address_type)
 187     {
 188     case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:
 189       return G_STRUCT_OFFSET(struct sockaddr_un, sun_path);
 190     case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
 191       return G_STRUCT_OFFSET(struct sockaddr_un, sun_path) + addr->priv->path_len + 1;
 192     default:
 193       return sizeof (struct sockaddr_un);
 194     }
 195 }
 196
 197 static gboolean
 198 g_unix_socket_address_to_native (GSocketAddress *address,
 199                                  gpointer        dest,
 200                                  gsize           destlen,
 201                                  GError        **error)
 202 {
 203   GUnixSocketAddress *addr = G_UNIX_SOCKET_ADDRESS (address);
 204   struct sockaddr_un *sock;
 205   gssize socklen;
 206
 207   socklen = g_unix_socket_address_get_native_size (address);
 208   if (destlen < socklen)
 209     {
 210       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NO_SPACE,
 211                            _("Not enough space for socket address"));
 212       return FALSE;
 213     }
 214
 215   sock = (struct sockaddr_un *) dest;
 216   memset (sock, 0, socklen);
 217   sock->sun_family = AF_UNIX;
 218
 219   switch (addr->priv->address_type)
 220     {
 221     case G_UNIX_SOCKET_ADDRESS_INVALID:
 222     case G_UNIX_SOCKET_ADDRESS_ANONYMOUS:
 223       break;
 224
 225     case G_UNIX_SOCKET_ADDRESS_PATH:
 226       strcpy (sock->sun_path, addr->priv->path);
 227       break;
 228
 229     case G_UNIX_SOCKET_ADDRESS_ABSTRACT:
 230     case G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED:
 231       if (!g_unix_socket_address_abstract_names_supported ())
 232         {
 233           g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 234                                _("Abstract UNIX domain socket addresses not supported on this system"));
 235           return FALSE;
 236         }
 237
 238       sock->sun_path[0] = 0;
 239       memcpy (sock->sun_path+1, addr->priv->path, addr->priv->path_len);
 240       break;
 241     }
 242
 243   return TRUE;
 244 }
 245
 246 static void
 247 g_unix_socket_address_class_init (GUnixSocketAddressClass *klass)
 248 {
 249   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 250   GSocketAddressClass *gsocketaddress_class = G_SOCKET_ADDRESS_CLASS (klass);
 251
 252   gobject_class->set_property = g_unix_socket_address_set_property;
 253   gobject_class->get_property = g_unix_socket_address_get_property;
 254
 255   gsocketaddress_class->get_family = g_unix_socket_address_get_family;
 256   gsocketaddress_class->to_native = g_unix_socket_address_to_native;
 257   gsocketaddress_class->get_native_size = g_unix_socket_address_get_native_size;
 258
 259   g_object_class_install_property (gobject_class,
 260                                    PROP_PATH,
 261                                    g_param_spec_string ("path",
 262                                                         P_("Path"),
 263                                                         P_("UNIX socket path"),
 264                                                         NULL,
 265                                                         G_PARAM_READWRITE |
 266                                                         G_PARAM_CONSTRUCT_ONLY |
 267                                                         G_PARAM_STATIC_STRINGS));
 268   g_object_class_install_property (gobject_class, PROP_PATH_AS_ARRAY,
 269                                    g_param_spec_boxed ("path-as-array",
 270                                                        P_("Path array"),
 271                                                        P_("UNIX socket path, as byte array"),
 272                                                        G_TYPE_BYTE_ARRAY,
 273                                                        G_PARAM_READWRITE |
 274                                                        G_PARAM_CONSTRUCT_ONLY |
 275                                                        G_PARAM_STATIC_STRINGS));
 276   /**
 277    * GUnixSocketAddress:abstract:
 278    *
 279    * Whether or not this is an abstract address
 280    *
 281    * Deprecated: Use #GUnixSocketAddress:address-type, which
 282    * distinguishes between zero-padded and non-zero-padded
 283    * abstract addresses.
 284    */
 285   g_object_class_install_property (gobject_class, PROP_ABSTRACT,
 286                                    g_param_spec_boolean ("abstract",
 287                                                          P_("Abstract"),
 288                                                          P_("Whether or not this is an abstract address"),
 289                                                          FALSE,
 290                                                          G_PARAM_READWRITE |
 291                                                          G_PARAM_CONSTRUCT_ONLY |
 292                                                          G_PARAM_STATIC_STRINGS));
 293   g_object_class_install_property (gobject_class, PROP_ADDRESS_TYPE,
 294                                    g_param_spec_enum ("address-type",
 295                                                       P_("Address type"),
 296                                                       P_("The type of UNIX socket address"),
 297                                                       G_TYPE_UNIX_SOCKET_ADDRESS_TYPE,
 298                                                       G_UNIX_SOCKET_ADDRESS_PATH,
 299                                                       G_PARAM_READWRITE |
 300                                                       G_PARAM_CONSTRUCT_ONLY |
 301                                                       G_PARAM_STATIC_STRINGS));
 302 }
 303
 304 static void
 305 g_unix_socket_address_init (GUnixSocketAddress *address)
 306 {
 307   address->priv = g_unix_socket_address_get_instance_private (address);
 308
 309   memset (address->priv->path, 0, sizeof (address->priv->path));
 310   address->priv->path_len = -1;
 311   address->priv->address_type = G_UNIX_SOCKET_ADDRESS_PATH;
 312 }
 313
 314 /**
 315  * g_unix_socket_address_new:
 316  * @path: the socket path
 317  *
 318  * Creates a new #GUnixSocketAddress for @path.
 319  *
 320  * To create abstract socket addresses, on systems that support that,
 321  * use g_unix_socket_address_new_abstract().
 322  *
 323  * Returns: a new #GUnixSocketAddress
 324  *
 325  * Since: 2.22
 326  */
 327 GSocketAddress *
 328 g_unix_socket_address_new (const gchar *path)
 329 {
 330   return g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,
 331                        "path", path,
 332                        "abstract", FALSE,
 333                        NULL);
 334 }
 335
 336 /**
 337  * g_unix_socket_address_new_abstract:
 338  * @path: (array length=path_len) (element-type gchar): the abstract name
 339  * @path_len: the length of @path, or -1
 340  *
 341  * Creates a new %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED
 342  * #GUnixSocketAddress for @path.
 343  *
 344  * Returns: a new #GUnixSocketAddress
 345  *
 346  * Deprecated: Use g_unix_socket_address_new_with_type().
 347  */
 348 GSocketAddress *
 349 g_unix_socket_address_new_abstract (const gchar *path,
 350                                     gint         path_len)
 351 {
 352   return g_unix_socket_address_new_with_type (path, path_len,
 353                                               G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);
 354 }
 355
 356 /**
 357  * g_unix_socket_address_new_with_type:
 358  * @path: (array length=path_len) (element-type gchar): the name
 359  * @path_len: the length of @path, or -1
 360  * @type: a #GUnixSocketAddressType
 361  *
 362  * Creates a new #GUnixSocketAddress of type @type with name @path.
 363  *
 364  * If @type is %G_UNIX_SOCKET_ADDRESS_PATH, this is equivalent to
 365  * calling g_unix_socket_address_new().
 366  *
 367  * If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT, then @path_len
 368  * bytes of @path will be copied to the socket's path, and only those
 369  * bytes will be considered part of the name. (If @path_len is -1,
 370  * then @path is assumed to be NUL-terminated.) For example, if @path
 371  * was "test", then calling g_socket_address_get_native_size() on the
 372  * returned socket would return 7 (2 bytes of overhead, 1 byte for the
 373  * abstract-socket indicator byte, and 4 bytes for the name "test").
 374  *
 375  * If @path_type is %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED, then
 376  * @path_len bytes of @path will be copied to the socket's path, the
 377  * rest of the path will be padded with 0 bytes, and the entire
 378  * zero-padded buffer will be considered the name. (As above, if
 379  * @path_len is -1, then @path is assumed to be NUL-terminated.) In
 380  * this case, g_socket_address_get_native_size() will always return
 381  * the full size of a <literal>struct sockaddr_un</literal>, although
 382  * g_unix_socket_address_get_path_len() will still return just the
 383  * length of @path.
 384  *
 385  * %G_UNIX_SOCKET_ADDRESS_ABSTRACT is preferred over
 386  * %G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED for new programs. Of course,
 387  * when connecting to a server created by another process, you must
 388  * use the appropriate type corresponding to how that process created
 389  * its listening socket.
 390  *
 391  * Returns: a new #GUnixSocketAddress
 392  *
 393  * Since: 2.26
 394  */
 395 GSocketAddress *
 396 g_unix_socket_address_new_with_type (const gchar            *path,
 397                                      gint                    path_len,
 398                                      GUnixSocketAddressType  type)
 399 {
 400   GSocketAddress *address;
 401   GByteArray *array;
 402
 403   if (type == G_UNIX_SOCKET_ADDRESS_ANONYMOUS)
 404     path_len = 0;
 405   else if (path_len == -1)
 406     path_len = strlen (path);
 407
 408   array = g_byte_array_sized_new (path_len);
 409
 410   g_byte_array_append (array, (guint8 *)path, path_len);
 411
 412   address = g_object_new (G_TYPE_UNIX_SOCKET_ADDRESS,
 413                           "path-as-array", array,
 414                           "address-type", type,
 415                           NULL);
 416
 417   g_byte_array_unref (array);
 418
 419   return address;
 420 }
 421
 422 /**
 423  * g_unix_socket_address_get_path:
 424  * @address: a #GInetSocketAddress
 425  *
 426  * Gets @address's path, or for abstract sockets the "name".
 427  *
 428  * Guaranteed to be zero-terminated, but an abstract socket
 429  * may contain embedded zeros, and thus you should use
 430  * g_unix_socket_address_get_path_len() to get the true length
 431  * of this string.
 432  *
 433  * Returns: the path for @address
 434  *
 435  * Since: 2.22
 436  */
 437 const char *
 438 g_unix_socket_address_get_path (GUnixSocketAddress *address)
 439 {
 440   return address->priv->path;
 441 }
 442
 443 /**
 444  * g_unix_socket_address_get_path_len:
 445  * @address: a #GInetSocketAddress
 446  *
 447  * Gets the length of @address's path.
 448  *
 449  * For details, see g_unix_socket_address_get_path().
 450  *
 451  * Returns: the length of the path
 452  *
 453  * Since: 2.22
 454  */
 455 gsize
 456 g_unix_socket_address_get_path_len (GUnixSocketAddress *address)
 457 {
 458   return address->priv->path_len;
 459 }
 460
 461 /**
 462  * g_unix_socket_address_get_address_type:
 463  * @address: a #GInetSocketAddress
 464  *
 465  * Gets @address's type.
 466  *
 467  * Returns: a #GUnixSocketAddressType
 468  *
 469  * Since: 2.26
 470  */
 471 GUnixSocketAddressType
 472 g_unix_socket_address_get_address_type (GUnixSocketAddress *address)
 473 {
 474   return address->priv->address_type;
 475 }
 476
 477 /**
 478  * g_unix_socket_address_get_is_abstract:
 479  * @address: a #GInetSocketAddress
 480  *
 481  * Tests if @address is abstract.
 482  *
 483  * Returns: %TRUE if the address is abstract, %FALSE otherwise
 484  *
 485  * Since: 2.22
 486  *
 487  * Deprecated: Use g_unix_socket_address_get_address_type()
 488  */
 489 gboolean
 490 g_unix_socket_address_get_is_abstract (GUnixSocketAddress *address)
 491 {
 492   return (address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT ||
 493           address->priv->address_type == G_UNIX_SOCKET_ADDRESS_ABSTRACT_PADDED);
 494 }
 495
 496 /**
 497  * g_unix_socket_address_abstract_names_supported:
 498  *
 499  * Checks if abstract UNIX domain socket names are supported.
 500  *
 501  * Returns: %TRUE if supported, %FALSE otherwise
 502  *
 503  * Since: 2.22
 504  */
 505 gboolean
 506 g_unix_socket_address_abstract_names_supported (void)
 507 {
 508 #ifdef __linux__
 509   return TRUE;
 510 #else
 511   return FALSE;
 512 #endif
 513 }