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

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2015-01-25 11:08:34 +00:00
/**
* @file PacketRouter.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 <flow/PacketRouter.h>
static void input_handler_done (PacketRouter *o, int data_len)
{
ASSERT(data_len >= 0)
ASSERT(data_len <= o->mtu - o->recv_offset)
ASSERT(!BPending_IsSet(&o->next_job))
DebugObject_Access(&o->d_obj);
// set next job
BPending_Set(&o->next_job);
// call handler
o->handler(o->user, RouteBufferSource_Pointer(&o->rbs), data_len);
return;
}
static void next_job_handler (PacketRouter *o)
{
DebugObject_Access(&o->d_obj);
// receive
PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset);
}
int PacketRouter_Init (PacketRouter *o, int mtu, int recv_offset, PacketRecvInterface *input, PacketRouter_handler handler, void *user, BPendingGroup *pg)
{
ASSERT(mtu >= 0)
ASSERT(recv_offset >= 0)
ASSERT(recv_offset <= mtu)
ASSERT(PacketRecvInterface_GetMTU(input) <= mtu - recv_offset)
// init arguments
o->mtu = mtu;
o->recv_offset = recv_offset;
o->input = input;
o->handler = handler;
o->user = user;
// init input
PacketRecvInterface_Receiver_Init(o->input, (PacketRecvInterface_handler_done)input_handler_done, o);
// init RouteBufferSource
if (!RouteBufferSource_Init(&o->rbs, mtu)) {
goto fail0;
}
// init next job
BPending_Init(&o->next_job, pg, (BPending_handler)next_job_handler, o);
// receive
PacketRecvInterface_Receiver_Recv(o->input, RouteBufferSource_Pointer(&o->rbs) + o->recv_offset);
DebugObject_Init(&o->d_obj);
return 1;
fail0:
return 0;
}
void PacketRouter_Free (PacketRouter *o)
{
DebugObject_Free(&o->d_obj);
// free next job
BPending_Free(&o->next_job);
// free RouteBufferSource
RouteBufferSource_Free(&o->rbs);
}
int PacketRouter_Route (PacketRouter *o, int len, RouteBuffer *output, uint8_t **next_buf, int copy_offset, int copy_len)
{
ASSERT(len >= 0)
ASSERT(len <= o->mtu)
ASSERT(RouteBuffer_GetMTU(output) == o->mtu)
ASSERT(copy_offset >= 0)
ASSERT(copy_offset <= o->mtu)
ASSERT(copy_len >= 0)
ASSERT(copy_len <= o->mtu - copy_offset)
ASSERT(BPending_IsSet(&o->next_job))
DebugObject_Access(&o->d_obj);
if (!RouteBufferSource_Route(&o->rbs, len, output, copy_offset, copy_len)) {
return 0;
}
if (next_buf) {
*next_buf = RouteBufferSource_Pointer(&o->rbs);
}
return 1;
}
void PacketRouter_AssertRoute (PacketRouter *o)
{
ASSERT(BPending_IsSet(&o->next_job))
DebugObject_Access(&o->d_obj);
}