void MediaSubsession::setDestinations(netAddressBits defaultDestAddress) {
// Get the destination address from the connection endpoint name
// (This will be 0 if it's not known, in which case we use the default)
netAddressBits destAddress = connectionEndpointAddress();
if (destAddress == 0) destAddress = defaultDestAddress;
struct in_addr destAddr; destAddr.s_addr = destAddress;
// The destination TTL remains unchanged:
int destTTL = ~0; // means: don't change
if (fRTPSocket != NULL) {
Port destPort(serverPortNum);
fRTPSocket->changeDestinationParameters(destAddr, destPort, destTTL);
}
if (fRTCPSocket != NULL && !isSSM()) {
// Note: For SSM sessions, the dest address for RTCP was already set.
Port destPort(serverPortNum+1);
fRTCPSocket->changeDestinationParameters(destAddr, destPort, destTTL);
}
}
int Groupsock::outputToAllMembersExcept(DirectedNetInterface* exceptInterface,
u_int8_t ttlToFwd,
unsigned char* data, unsigned size,
netAddressBits sourceAddr) {
// Don't forward TTL-0 packets
if (ttlToFwd == 0) return 0;
DirectedNetInterfaceSet::Iterator iter(members());
unsigned numMembers = 0;
DirectedNetInterface* interf;
while ((interf = iter.next()) != NULL) {
// Check whether we've asked to exclude this interface:
if (interf == exceptInterface)
continue;
// Check that the packet's source address makes it OK to
// be relayed across this interface:
UsageEnvironment& saveEnv = env();
// because the following call may delete "this"
if (!interf->SourceAddrOKForRelaying(saveEnv, sourceAddr)) {
if (strcmp(saveEnv.getResultMsg(), "") != 0) {
// Treat this as a fatal error
return -1;
} else {
continue;
}
}
if (numMembers == 0) {
// We know that we're going to forward to at least one
// member, so fill in the tunnel encapsulation trailer.
// (Note: Allow for it not being 4-byte-aligned.)
TunnelEncapsulationTrailer* trailerInPacket
= (TunnelEncapsulationTrailer*)&data[size];
TunnelEncapsulationTrailer* trailer;
Boolean misaligned = ((uintptr_t)trailerInPacket & 3) != 0;
unsigned trailerOffset;
u_int8_t tunnelCmd;
if (isSSM()) {
// add an 'auxilliary address' before the trailer
trailerOffset = TunnelEncapsulationTrailerAuxSize;
tunnelCmd = TunnelDataAuxCmd;
} else {
trailerOffset = 0;
tunnelCmd = TunnelDataCmd;
}
unsigned trailerSize = TunnelEncapsulationTrailerSize + trailerOffset;
unsigned tmpTr[TunnelEncapsulationTrailerMaxSize];
if (misaligned) {
trailer = (TunnelEncapsulationTrailer*)&tmpTr;
} else {
trailer = trailerInPacket;
}
trailer += trailerOffset;
if (fDests != NULL) {
trailer->address() = fDests->fGroupEId.groupAddress().s_addr;
Port destPort(ntohs(fDests->fGroupEId.portNum()));
trailer->port() = destPort; // structure copy
}
trailer->ttl() = ttlToFwd;
trailer->command() = tunnelCmd;
if (isSSM()) {
trailer->auxAddress() = sourceFilterAddress().s_addr;
}
if (misaligned) {
memmove(trailerInPacket, trailer-trailerOffset, trailerSize);
}
size += trailerSize;
}
interf->write(data, size);
++numMembers;
}
return numMembers;
}
