/* GIO - GLib Input, Output and Streaming Library * * Copyright 2011 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, see . */ #include #include #include #include "ginetaddressmask.h" #include "ginetaddress.h" #include "ginitable.h" #include "gioerror.h" #include "gioenumtypes.h" #include "glibintl.h" /** * SECTION:ginetaddressmask * @short_description: An IPv4/IPv6 address mask * @include: gio/gio.h * * #GInetAddressMask represents a range of IPv4 or IPv6 addresses * described by a base address and a length indicating how many bits * of the base address are relevant for matching purposes. These are * often given in string form. Eg, "10.0.0.0/8", or "fe80::/10". */ /** * GInetAddressMask: * * A combination of an IPv4 or IPv6 base address and a length, * representing a range of IP addresses. * * Since: 2.32 */ struct _GInetAddressMaskPrivate { GInetAddress *addr; guint length; }; static void g_inet_address_mask_initable_iface_init (GInitableIface *iface); G_DEFINE_TYPE_WITH_CODE (GInetAddressMask, g_inet_address_mask, G_TYPE_OBJECT, G_ADD_PRIVATE (GInetAddressMask) G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, g_inet_address_mask_initable_iface_init)) enum { PROP_0, PROP_FAMILY, PROP_ADDRESS, PROP_LENGTH }; static void g_inet_address_mask_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GInetAddressMask *mask = G_INET_ADDRESS_MASK (object); switch (prop_id) { case PROP_ADDRESS: if (mask->priv->addr) g_object_unref (mask->priv->addr); mask->priv->addr = g_value_dup_object (value); break; case PROP_LENGTH: mask->priv->length = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void g_inet_address_mask_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GInetAddressMask *mask = G_INET_ADDRESS_MASK (object); switch (prop_id) { case PROP_FAMILY: g_value_set_enum (value, g_inet_address_get_family (mask->priv->addr)); break; case PROP_ADDRESS: g_value_set_object (value, mask->priv->addr); break; case PROP_LENGTH: g_value_set_uint (value, mask->priv->length); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); } } static void g_inet_address_mask_dispose (GObject *object) { GInetAddressMask *mask = G_INET_ADDRESS_MASK (object); g_clear_object (&mask->priv->addr); G_OBJECT_CLASS (g_inet_address_mask_parent_class)->dispose (object); } static void g_inet_address_mask_class_init (GInetAddressMaskClass *klass) { GObjectClass *gobject_class = G_OBJECT_CLASS (klass); gobject_class->set_property = g_inet_address_mask_set_property; gobject_class->get_property = g_inet_address_mask_get_property; gobject_class->dispose = g_inet_address_mask_dispose; g_object_class_install_property (gobject_class, PROP_FAMILY, g_param_spec_enum ("family", P_("Address family"), P_("The address family (IPv4 or IPv6)"), G_TYPE_SOCKET_FAMILY, G_SOCKET_FAMILY_INVALID, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ADDRESS, g_param_spec_object ("address", P_("Address"), P_("The base address"), G_TYPE_INET_ADDRESS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_LENGTH, g_param_spec_uint ("length", P_("Length"), P_("The prefix length"), 0, 128, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } static gboolean g_inet_address_mask_initable_init (GInitable *initable, GCancellable *cancellable, GError **error) { GInetAddressMask *mask = G_INET_ADDRESS_MASK (initable); guint addrlen, nbytes, nbits; const guint8 *bytes; gboolean ok; if (!mask->priv->addr) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("No address specified")); return FALSE; } addrlen = g_inet_address_get_native_size (mask->priv->addr); if (mask->priv->length > addrlen * 8) { g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("Length %u is too long for address"), mask->priv->length); return FALSE; } /* Make sure all the bits after @length are 0 */ bytes = g_inet_address_to_bytes (mask->priv->addr); ok = TRUE; nbytes = mask->priv->length / 8; bytes += nbytes; addrlen -= nbytes; nbits = mask->priv->length % 8; if (nbits) { if (bytes[0] & (0xFF >> nbits)) ok = FALSE; bytes++; addrlen--; } while (addrlen) { if (bytes[0]) ok = FALSE; bytes++; addrlen--; } if (!ok) { g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("Address has bits set beyond prefix length")); return FALSE; } return TRUE; } static void g_inet_address_mask_initable_iface_init (GInitableIface *iface) { iface->init = g_inet_address_mask_initable_init; } static void g_inet_address_mask_init (GInetAddressMask *mask) { mask->priv = g_inet_address_mask_get_instance_private (mask); } /** * g_inet_address_mask_new: * @addr: a #GInetAddress * @length: number of bits of @addr to use * @error: return location for #GError, or %NULL * * Creates a new #GInetAddressMask representing all addresses whose * first @length bits match @addr. * * Returns: a new #GInetAddressMask, or %NULL on error * * Since: 2.32 */ GInetAddressMask * g_inet_address_mask_new (GInetAddress *addr, guint length, GError **error) { return g_initable_new (G_TYPE_INET_ADDRESS_MASK, NULL, error, "address", addr, "length", length, NULL); } /** * g_inet_address_mask_new_from_string: * @mask_string: an IP address or address/length string * @error: return location for #GError, or %NULL * * Parses @mask_string as an IP address and (optional) length, and * creates a new #GInetAddressMask. The length, if present, is * delimited by a "/". If it is not present, then the length is * assumed to be the full length of the address. * * Returns: a new #GInetAddressMask corresponding to @string, or %NULL * on error. * * Since: 2.32 */ GInetAddressMask * g_inet_address_mask_new_from_string (const gchar *mask_string, GError **error) { GInetAddressMask *mask; GInetAddress *addr; gchar *slash; guint length; slash = strchr (mask_string, '/'); if (slash) { gchar *address, *end; length = strtoul (slash + 1, &end, 10); if (*end || !*(slash + 1)) { parse_error: g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT, _("Could not parse ā€œ%sā€ as IP address mask"), mask_string); return NULL; } address = g_strndup (mask_string, slash - mask_string); addr = g_inet_address_new_from_string (address); g_free (address); if (!addr) goto parse_error; } else { addr = g_inet_address_new_from_string (mask_string); if (!addr) goto parse_error; length = g_inet_address_get_native_size (addr) * 8; } mask = g_inet_address_mask_new (addr, length, error); g_object_unref (addr); return mask; } /** * g_inet_address_mask_to_string: * @mask: a #GInetAddressMask * * Converts @mask back to its corresponding string form. * * Returns: a string corresponding to @mask. * * Since: 2.32 */ gchar * g_inet_address_mask_to_string (GInetAddressMask *mask) { gchar *addr_string, *mask_string; g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), NULL); addr_string = g_inet_address_to_string (mask->priv->addr); if (mask->priv->length == (g_inet_address_get_native_size (mask->priv->addr) * 8)) return addr_string; mask_string = g_strdup_printf ("%s/%u", addr_string, mask->priv->length); g_free (addr_string); return mask_string; } /** * g_inet_address_mask_get_family: * @mask: a #GInetAddressMask * * Gets the #GSocketFamily of @mask's address * * Returns: the #GSocketFamily of @mask's address * * Since: 2.32 */ GSocketFamily g_inet_address_mask_get_family (GInetAddressMask *mask) { g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), G_SOCKET_FAMILY_INVALID); return g_inet_address_get_family (mask->priv->addr); } /** * g_inet_address_mask_get_address: * @mask: a #GInetAddressMask * * Gets @mask's base address * * Returns: (transfer none): @mask's base address * * Since: 2.32 */ GInetAddress * g_inet_address_mask_get_address (GInetAddressMask *mask) { g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), NULL); return mask->priv->addr; } /** * g_inet_address_mask_get_length: * @mask: a #GInetAddressMask * * Gets @mask's length * * Returns: @mask's length * * Since: 2.32 */ guint g_inet_address_mask_get_length (GInetAddressMask *mask) { g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), 0); return mask->priv->length; } /** * g_inet_address_mask_matches: * @mask: a #GInetAddressMask * @address: a #GInetAddress * * Tests if @address falls within the range described by @mask. * * Returns: whether @address falls within the range described by * @mask. * * Since: 2.32 */ gboolean g_inet_address_mask_matches (GInetAddressMask *mask, GInetAddress *address) { const guint8 *maskbytes, *addrbytes; int nbytes, nbits; g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), FALSE); g_return_val_if_fail (G_IS_INET_ADDRESS (address), FALSE); if (g_inet_address_get_family (mask->priv->addr) != g_inet_address_get_family (address)) return FALSE; if (mask->priv->length == 0) return TRUE; maskbytes = g_inet_address_to_bytes (mask->priv->addr); addrbytes = g_inet_address_to_bytes (address); nbytes = mask->priv->length / 8; if (nbytes != 0 && memcmp (maskbytes, addrbytes, nbytes) != 0) return FALSE; nbits = mask->priv->length % 8; if (nbits == 0) return TRUE; return maskbytes[nbytes] == (addrbytes[nbytes] & (0xFF << (8 - nbits))); } /** * g_inet_address_mask_equal: * @mask: a #GInetAddressMask * @mask2: another #GInetAddressMask * * Tests if @mask and @mask2 are the same mask. * * Returns: whether @mask and @mask2 are the same mask * * Since: 2.32 */ gboolean g_inet_address_mask_equal (GInetAddressMask *mask, GInetAddressMask *mask2) { g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask), FALSE); g_return_val_if_fail (G_IS_INET_ADDRESS_MASK (mask2), FALSE); return ((mask->priv->length == mask2->priv->length) && g_inet_address_equal (mask->priv->addr, mask2->priv->addr)); }