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

100 lines
3.2 KiB
C

/**
* @file PacketRecvBlocker.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 <misc/debug.h>
#include <flow/PacketRecvBlocker.h>
static void output_handler_recv (PacketRecvBlocker *o, uint8_t *data)
{
ASSERT(!o->out_have)
DebugObject_Access(&o->d_obj);
// remember packet
o->out_have = 1;
o->out = data;
o->out_input_blocking = 0;
}
static void input_handler_done (PacketRecvBlocker *o, int data_len)
{
ASSERT(o->out_have)
ASSERT(o->out_input_blocking)
DebugObject_Access(&o->d_obj);
// schedule done
o->out_have = 0;
PacketRecvInterface_Done(&o->output, data_len);
}
void PacketRecvBlocker_Init (PacketRecvBlocker *o, PacketRecvInterface *input, BPendingGroup *pg)
{
// init arguments
o->input = input;
// init output
PacketRecvInterface_Init(&o->output, PacketRecvInterface_GetMTU(o->input), (PacketRecvInterface_handler_recv)output_handler_recv, o, pg);
// have no output packet
o->out_have = 0;
// init input
PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
DebugObject_Init(&o->d_obj);
}
void PacketRecvBlocker_Free (PacketRecvBlocker *o)
{
DebugObject_Free(&o->d_obj);
// free output
PacketRecvInterface_Free(&o->output);
}
PacketRecvInterface * PacketRecvBlocker_GetOutput (PacketRecvBlocker *o)
{
DebugObject_Access(&o->d_obj);
return &o->output;
}
void PacketRecvBlocker_AllowBlockedPacket (PacketRecvBlocker *o)
{
DebugObject_Access(&o->d_obj);
if (!o->out_have || o->out_input_blocking) {
return;
}
// schedule receive
o->out_input_blocking = 1;
PacketRecvInterface_Receiver_Recv(o->input, o->out);
}