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

102 lines
3.4 KiB
C

/**
* @file PacketProtoEncoder.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 <string.h>
#include <protocol/packetproto.h>
#include <misc/balign.h>
#include <misc/debug.h>
#include <misc/byteorder.h>
#include <flow/PacketProtoEncoder.h>
static void output_handler_recv (PacketProtoEncoder *enc, uint8_t *data)
{
ASSERT(!enc->output_packet)
ASSERT(data)
DebugObject_Access(&enc->d_obj);
// schedule receive
enc->output_packet = data;
PacketRecvInterface_Receiver_Recv(enc->input, enc->output_packet + sizeof(struct packetproto_header));
}
static void input_handler_done (PacketProtoEncoder *enc, int in_len)
{
ASSERT(enc->output_packet)
DebugObject_Access(&enc->d_obj);
// write length
struct packetproto_header pp;
pp.len = htol16(in_len);
memcpy(enc->output_packet, &pp, sizeof(pp));
// finish output packet
enc->output_packet = NULL;
PacketRecvInterface_Done(&enc->output, PACKETPROTO_ENCLEN(in_len));
}
void PacketProtoEncoder_Init (PacketProtoEncoder *enc, PacketRecvInterface *input, BPendingGroup *pg)
{
ASSERT(PacketRecvInterface_GetMTU(input) <= PACKETPROTO_MAXPAYLOAD)
// init arguments
enc->input = input;
// init input
PacketRecvInterface_Receiver_Init(enc->input, (PacketRecvInterface_handler_done)input_handler_done, enc);
// init output
PacketRecvInterface_Init(
&enc->output, PACKETPROTO_ENCLEN(PacketRecvInterface_GetMTU(enc->input)),
(PacketRecvInterface_handler_recv)output_handler_recv, enc, pg
);
// set no output packet
enc->output_packet = NULL;
DebugObject_Init(&enc->d_obj);
}
void PacketProtoEncoder_Free (PacketProtoEncoder *enc)
{
DebugObject_Free(&enc->d_obj);
// free input
PacketRecvInterface_Free(&enc->output);
}
PacketRecvInterface * PacketProtoEncoder_GetOutput (PacketProtoEncoder *enc)
{
DebugObject_Access(&enc->d_obj);
return &enc->output;
}