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libtgvoip/controller/protocol/Legacy.cpp

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#include "../PrivateDefines.cpp"
using namespace tgvoip;
using namespace std;
bool VoIPController::legacyParsePacket(BufferInputStream &in, unsigned char &type, uint32_t &ackId, uint32_t &pseq, uint32_t &acks, unsigned char &pflags, size_t &packetInnerLen)
{
uint32_t tlid = in.ReadUInt32();
if (tlid == TLID_DECRYPTED_AUDIO_BLOCK)
{
in.ReadInt64(); // random id
uint32_t randLen = in.ReadTlLength();
in.Seek(in.GetOffset() + randLen + pad4(randLen));
uint32_t flags = in.ReadUInt32();
type = (unsigned char)((flags >> 24) & 0xFF);
if (!(flags & PFLAG_HAS_SEQ && flags & PFLAG_HAS_RECENT_RECV))
{
LOGW("Received packet doesn't have PFLAG_HAS_SEQ, PFLAG_HAS_RECENT_RECV, or both");
return false;
}
if (flags & PFLAG_HAS_CALL_ID)
{
unsigned char pktCallID[16];
in.ReadBytes(pktCallID, 16);
if (memcmp(pktCallID, callID, 16) != 0)
{
LOGW("Received packet has wrong call id");
lastError = ERROR_UNKNOWN;
SetState(STATE_FAILED);
return false;
}
}
ackId = in.ReadUInt32();
pseq = in.ReadUInt32();
acks = in.ReadUInt32();
if (flags & PFLAG_HAS_PROTO)
{
uint32_t proto = in.ReadUInt32();
if (proto != PROTOCOL_NAME)
{
LOGW("Received packet uses wrong protocol");
lastError = ERROR_INCOMPATIBLE;
SetState(STATE_FAILED);
return false;
}
}
if (flags & PFLAG_HAS_EXTRA)
{
uint32_t extraLen = in.ReadTlLength();
in.Seek(in.GetOffset() + extraLen + pad4(extraLen));
}
if (flags & PFLAG_HAS_DATA)
{
packetInnerLen = in.ReadTlLength();
}
pflags = 0;
}
else if (tlid == TLID_SIMPLE_AUDIO_BLOCK)
{
in.ReadInt64(); // random id
uint32_t randLen = in.ReadTlLength();
in.Seek(in.GetOffset() + randLen + pad4(randLen));
packetInnerLen = in.ReadTlLength();
type = in.ReadByte();
ackId = in.ReadUInt32();
pseq = in.ReadUInt32();
acks = in.ReadUInt32();
if (peerVersion >= 6)
pflags = in.ReadByte();
else
pflags = 0;
}
else
{
LOGW("Received a packet of unknown type %08X", tlid);
return false;
}
return true;
}
void VoIPController::legacyHandleQueuedPackets()
{
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for (auto it = queuedPackets.begin(); it != queuedPackets.end();)
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{
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QueuedPacket &qp = *it;
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bool didAck = false;
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for (uint8_t j = 0; j < 16; j++)
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{
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LOGD("queued packet %ld, seq %u=%u", queuedPackets.end() - it, j, qp.seqs[j]);
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if (qp.seqs[j] == 0)
break;
int remoteAcksIndex = lastRemoteAckSeq - qp.seqs[j];
//LOGV("remote acks index %u, value %f", remoteAcksIndex, remoteAcksIndex>=0 && remoteAcksIndex<32 ? remoteAcks[remoteAcksIndex] : -1);
if (seqgt(lastRemoteAckSeq, qp.seqs[j]) && remoteAcksIndex >= 0 && remoteAcksIndex < 32)
{
for (const auto &opkt : recentOutgoingPackets)
{
if (opkt.seq == qp.seqs[j] && opkt.ackTime > 0)
{
LOGD("did ack seq %u, removing", qp.seqs[j]);
didAck = true;
break;
}
}
if (didAck)
break;
}
}
if (didAck)
{
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it = queuedPackets.erase(it);
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continue;
}
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++it;
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}
}