tor-android/external/badvpn_dns/flow/PacketRecvConnector.c

124 lines
3.7 KiB
C

/**
* @file PacketRecvConnector.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stddef.h>
#include <misc/debug.h>
#include <flow/PacketRecvConnector.h>
static void output_handler_recv (PacketRecvConnector *o, uint8_t *data)
{
ASSERT(!o->out_have)
DebugObject_Access(&o->d_obj);
// remember output packet
o->out_have = 1;
o->out = data;
if (o->input) {
// schedule receive
PacketRecvInterface_Receiver_Recv(o->input, o->out);
}
}
static void input_handler_done (PacketRecvConnector *o, int data_len)
{
ASSERT(o->out_have)
ASSERT(o->input)
DebugObject_Access(&o->d_obj);
// have no output packet
o->out_have = 0;
// allow output to receive more packets
PacketRecvInterface_Done(&o->output, data_len);
}
void PacketRecvConnector_Init (PacketRecvConnector *o, int mtu, BPendingGroup *pg)
{
ASSERT(mtu >= 0)
// init arguments
o->output_mtu = mtu;
// init output
PacketRecvInterface_Init(&o->output, o->output_mtu, (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
// have no output packet
o->out_have = 0;
// have no input
o->input = NULL;
DebugObject_Init(&o->d_obj);
}
void PacketRecvConnector_Free (PacketRecvConnector *o)
{
DebugObject_Free(&o->d_obj);
// free output
PacketRecvInterface_Free(&o->output);
}
PacketRecvInterface * PacketRecvConnector_GetOutput (PacketRecvConnector *o)
{
DebugObject_Access(&o->d_obj);
return &o->output;
}
void PacketRecvConnector_ConnectInput (PacketRecvConnector *o, PacketRecvInterface *input)
{
ASSERT(!o->input)
ASSERT(PacketRecvInterface_GetMTU(input) <= o->output_mtu)
DebugObject_Access(&o->d_obj);
// set input
o->input = input;
// init input
PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
// if we have an output packet, schedule receive
if (o->out_have) {
PacketRecvInterface_Receiver_Recv(o->input, o->out);
}
}
void PacketRecvConnector_DisconnectInput (PacketRecvConnector *o)
{
ASSERT(o->input)
DebugObject_Access(&o->d_obj);
// set no input
o->input = NULL;
}