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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* Copyright (C) 2021 Ole André Vadla Ravnås <oleavr@frida.re>
*
* 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/>.
*
* In addition, when the library is used with OpenSSL, a special
* exception applies. Refer to the LICENSE_EXCEPTION file for details.
*/
#include "config.h"
#include "lossy-socket.h"
struct _LossySocket
{
GObject parent_instance;
GDatagramBased *base_socket;
IOPredicateFunc predicate_func;
gpointer predicate_data;
gint next_rx_serial;
gint next_tx_serial;
};
static void lossy_socket_datagram_based_iface_init (GDatagramBasedInterface *iface);
G_DEFINE_FINAL_TYPE_WITH_CODE (LossySocket,
lossy_socket,
G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_DATAGRAM_BASED,
lossy_socket_datagram_based_iface_init))
static gint
lossy_socket_receive_messages (GDatagramBased *datagram_based,
GInputMessage *messages,
guint num_messages,
gint flags,
gint64 timeout,
GCancellable *cancellable,
GError **error)
{
LossySocket *self = LOSSY_SOCKET (datagram_based);
gint ret;
gboolean skip;
do
{
IODetails d;
skip = FALSE;
ret = g_datagram_based_receive_messages (self->base_socket, messages,
num_messages, flags, timeout,
cancellable, error);
if (ret <= 0)
break;
d.direction = IO_IN;
d.serial = self->next_rx_serial++;
if (self->predicate_func (&d, self->predicate_data) == IO_DROP)
{
messages->bytes_received = 0;
messages->flags = 0;
if (timeout == 0)
{
ret = -1;
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK,
"Operation would block");
}
else
{
skip = TRUE;
}
}
}
while (skip);
return ret;
}
static gint
lossy_socket_send_messages (GDatagramBased *datagram_based,
GOutputMessage *messages,
guint num_messages,
gint flags,
gint64 timeout,
GCancellable *cancellable,
GError **error)
{
LossySocket *self = LOSSY_SOCKET (datagram_based);
IODetails d;
d.direction = IO_OUT;
d.serial = self->next_tx_serial++;
if (self->predicate_func (&d, self->predicate_data) == IO_DROP)
{
guint i, j;
for (i = 0; i < num_messages; i++)
{
GOutputMessage *m = &messages[i];
for (j = 0; j < m->num_vectors; j++)
m->bytes_sent += m->vectors[j].size;
}
return num_messages;
}
return g_datagram_based_send_messages (self->base_socket, messages,
num_messages, flags, timeout,
cancellable, error);
}
static GSource *
lossy_socket_create_source (GDatagramBased *datagram_based,
GIOCondition condition,
GCancellable *cancellable)
{
LossySocket *self = LOSSY_SOCKET (datagram_based);
return g_datagram_based_create_source (self->base_socket, condition,
cancellable);
}
static GIOCondition
lossy_socket_condition_check (GDatagramBased *datagram_based,
GIOCondition condition)
{
LossySocket *self = LOSSY_SOCKET (datagram_based);
return g_datagram_based_condition_check (self->base_socket, condition);
}
static gboolean
lossy_socket_condition_wait (GDatagramBased *datagram_based,
GIOCondition condition,
gint64 timeout,
GCancellable *cancellable,
GError **error)
{
LossySocket *self = LOSSY_SOCKET (datagram_based);
return g_datagram_based_condition_wait (self->base_socket, condition, timeout,
cancellable, error);
}
static void
lossy_socket_init (LossySocket *self)
{
self->next_rx_serial = 1;
self->next_tx_serial = 1;
}
static void
lossy_socket_dispose (GObject *object)
{
LossySocket *self = LOSSY_SOCKET (object);
g_clear_object (&self->base_socket);
G_OBJECT_CLASS (lossy_socket_parent_class)->dispose (object);
}
static void
lossy_socket_class_init (LossySocketClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = lossy_socket_dispose;
}
static void
lossy_socket_datagram_based_iface_init (GDatagramBasedInterface *iface)
{
iface->receive_messages = lossy_socket_receive_messages;
iface->send_messages = lossy_socket_send_messages;
iface->create_source = lossy_socket_create_source;
iface->condition_check = lossy_socket_condition_check;
iface->condition_wait = lossy_socket_condition_wait;
}
GDatagramBased *
lossy_socket_new (GDatagramBased *base_socket,
IOPredicateFunc predicate_func,
gpointer predicate_data)
{
LossySocket *s;
s = g_object_new (LOSSY_TYPE_SOCKET, NULL);
s->base_socket = g_object_ref (base_socket);
s->predicate_func = predicate_func;
s->predicate_data = predicate_data;
return G_DATAGRAM_BASED (s);
}
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