Boolean Groupsock::handleRead(unsigned char* buffer, unsigned bufferMaxSize,
unsigned& bytesRead,
struct sockaddr_in& fromAddress) {
// Read data from the socket, and relay it across any attached tunnels
//##### later make this code more general - independent of tunnels
bytesRead = 0;
int maxBytesToRead = bufferMaxSize - TunnelEncapsulationTrailerMaxSize;
int numBytes = readSocket(env(), socketNum(),
buffer, maxBytesToRead, fromAddress);
if (numBytes < 0) {
if (DebugLevel >= 0) { // this is a fatal error
env().setResultMsg("Groupsock read failed: ",
env().getResultMsg());
}
return False;
}
// If we're a SSM group, make sure the source address matches:
if (isSSM()
&& fromAddress.sin_addr.s_addr != sourceFilterAddress().s_addr) {
return True;
}
// We'll handle this data.
// Also write it (with the encapsulation trailer) to each member,
// unless the packet was originally sent by us to begin with.
bytesRead = numBytes;
int numMembers = 0;
if (!wasLoopedBackFromUs(env(), fromAddress)) {
statsIncoming.countPacket(numBytes);
statsGroupIncoming.countPacket(numBytes);
numMembers =
outputToAllMembersExcept(NULL, ttl(),
buffer, bytesRead,
fromAddress.sin_addr.s_addr);
if (numMembers > 0) {
statsRelayedIncoming.countPacket(numBytes);
statsGroupRelayedIncoming.countPacket(numBytes);
}
}
if (DebugLevel >= 3) {
env() << *this << ": read " << bytesRead << " bytes from ";
env() << our_inet_ntoa(fromAddress.sin_addr);
if (numMembers > 0) {
env() << "; relayed to " << numMembers << " members";
}
env() << "\n";
}
return True;
}
Boolean Groupsock::output(UsageEnvironment& env, u_int8_t ttlToSend,
unsigned char* buffer, unsigned bufferSize,
DirectedNetInterface* interfaceNotToFwdBackTo) {
do {
// First, do the datagram send, to each destination:
Boolean writeSuccess = True;
for (destRecord* dests = fDests; dests != NULL; dests = dests->fNext) {
int res = 0;
if (!(res = write(dests->fGroupEId.groupAddress().s_addr, dests->fPort, ttlToSend,
buffer, bufferSize))) {
if (-1 == res)
{
fprintf(stderr, "errno = %d, errorsrting = %s\n", strerror(errno));
}
writeSuccess = False;
break;
}
}
if (!writeSuccess) break;
statsOutgoing.countPacket(bufferSize);
statsGroupOutgoing.countPacket(bufferSize);
// Then, forward to our members:
int numMembers = 0;
if (!members().IsEmpty()) {
numMembers =
outputToAllMembersExcept(interfaceNotToFwdBackTo,
ttlToSend, buffer, bufferSize,
ourIPAddress(env));
if (numMembers < 0) break;
}
if (DebugLevel >= 3) {
env << *this << ": wrote " << bufferSize << " bytes, ttl "
<< (unsigned)ttlToSend;
if (numMembers > 0) {
env << "; relayed to " << numMembers << " members";
}
env << "\n";
}
return True;
} while (0);
if (DebugLevel >= 0) { // this is a fatal error
env.setResultMsg("Groupsock write failed: ", env.getResultMsg());
}
return False;
}
Boolean Groupsock::output(UsageEnvironment& env, unsigned char* buffer, unsigned bufferSize,
DirectedNetInterface* interfaceNotToFwdBackTo) {
do {
// First, do the datagram send, to each destination:
Boolean writeSuccess = True;
for (destRecord* dests = fDests; dests != NULL; dests = dests->fNext) {
if (!write(dests->fGroupEId.groupAddress().s_addr, dests->fGroupEId.portNum(), dests->fGroupEId.ttl(),
buffer, bufferSize)) {
writeSuccess = False;
break;
}
}
if (!writeSuccess) break;
statsOutgoing.countPacket(bufferSize);
statsGroupOutgoing.countPacket(bufferSize);
// Then, forward to our members:
int numMembers = 0;
if (!members().IsEmpty()) {
numMembers =
outputToAllMembersExcept(interfaceNotToFwdBackTo,
ttl(), buffer, bufferSize,
ourIPAddress(env));
if (numMembers < 0) break;
}
if (DebugLevel >= 3) {
env << *this << ": wrote " << bufferSize << " bytes, ttl " << (unsigned)ttl();
if (numMembers > 0) {
env << "; relayed to " << numMembers << " members";
}
env << "\n";
}
return True;
} while (0);
if (DebugLevel >= 0) { // this is a fatal error
UsageEnvironment::MsgString msg = strDup(env.getResultMsg());
env.setResultMsg("Groupsock write failed: ", msg);
delete[] (char*)msg;
}
return False;
}