From 2659427864aee89977a58440705f7069c0e6c639 Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Tue, 30 Sep 2014 16:28:25 -0700
Subject: Multicaster needs to be global, not per-network, and a bunch of other
 stuff.

---
 node/Multicaster.cpp | 78 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 72 insertions(+), 6 deletions(-)

(limited to 'node/Multicaster.cpp')

diff --git a/node/Multicaster.cpp b/node/Multicaster.cpp
index 9cd8f8bf..fe590fed 100644
--- a/node/Multicaster.cpp
+++ b/node/Multicaster.cpp
@@ -34,6 +34,7 @@
 #include "Switch.hpp"
 #include "Packet.hpp"
 #include "Peer.hpp"
+#include "CMWC4096.hpp"
 #include "CertificateOfMembership.hpp"
 #include "RuntimeEnvironment.hpp"
 
@@ -47,10 +48,75 @@ Multicaster::~Multicaster()
 {
 }
 
-void Multicaster::send(const RuntimeEnvironment *RR,uint64_t nwid,const CertificateOfMembership *com,unsigned int limit,uint64_t now,const MulticastGroup &mg,const MAC &src,unsigned int etherType,const void *data,unsigned int len)
+unsigned int Multicaster::gather(const RuntimeEnvironment *RR,uint64_t nwid,MulticastGroup &mg,Packet &appendTo,unsigned int limit) const
+{
+	unsigned char *p;
+	unsigned int n = 0,i,rptr;
+	uint64_t a,done[(ZT_PROTO_MAX_PACKET_LENGTH / 5) + 1];
+
+	Mutex::Lock _l(_groups_m);
+
+	std::map< std::pair<uint64_t,MulticastGroup>,MulticastGroupStatus >::const_iterator gs(_groups.find(std::pair<uint64_t,MulticastGroup>(nwid,mg)));
+	if ((gs == _groups.end())||(gs->second.members.empty())) {
+		appendTo.append((uint32_t)0);
+		appendTo.append((uint16_t)0);
+		return 0;
+	}
+
+	if (limit > gs->second.members.size())
+		limit = (unsigned int)gs->second.members.size();
+	if (limit > 0xffff) // sanity check -- this won't fit in a packet anyway
+		limit = 0xffff;
+
+	appendTo.append((uint32_t)gs->second.members.size());
+	unsigned int nAt = appendTo.size();
+	appendTo.append((uint16_t)0); // set to n later
+
+	while ((n < limit)&&((appendTo.size() + ZT_ADDRESS_LENGTH) <= ZT_PROTO_MAX_PACKET_LENGTH)) {
+		// Pick a member at random -- if we've already picked it,
+		// keep circling the buffer until we find one we haven't.
+		// This won't loop forever since limit <= members.size().
+		rptr = (unsigned int)RR->prng->next32();
+restart_member_scan:
+		a = gs->second.members[rptr % (unsigned int)gs->second.members.size()].address.toInt();
+		for(i=0;i<n;++i) {
+			if (done[i] == a) {
+				++rptr;
+				goto restart_member_scan;
+			}
+		}
+
+		// Log that we've picked this one
+		done[n++] = a;
+
+		// Append to packet
+		p = (unsigned char *)appendTo.appendField(ZT_ADDRESS_LENGTH);
+		*(p++) = (unsigned char)((a >> 32) & 0xff);
+		*(p++) = (unsigned char)((a >> 24) & 0xff);
+		*(p++) = (unsigned char)((a >> 16) & 0xff);
+		*(p++) = (unsigned char)((a >> 8) & 0xff);
+		*p = (unsigned char)(a & 0xff);
+	}
+
+	appendTo.setAt(nAt,(uint16_t)n);
+
+	return n;
+}
+
+void Multicaster::send(
+	const RuntimeEnvironment *RR,
+	const CertificateOfMembership *com,
+	unsigned int limit,
+	uint64_t now,
+	uint64_t nwid,
+	const MulticastGroup &mg,
+	const MAC &src,
+	unsigned int etherType,
+	const void *data,
+	unsigned int len)
 {
 	Mutex::Lock _l(_groups_m);
-	MulticastGroupStatus &gs = _groups[mg];
+	MulticastGroupStatus &gs = _groups[std::pair<uint64_t,MulticastGroup>(nwid,mg)];
 
 	if (gs.members.size() >= limit) {
 		// If we already have enough members, just send and we're done -- no need for TX queue
@@ -95,13 +161,13 @@ void Multicaster::send(const RuntimeEnvironment *RR,uint64_t nwid,const Certific
 	}
 }
 
-void Multicaster::clean(const RuntimeEnvironment *RR,uint64_t now,unsigned int limit)
+void Multicaster::clean(const RuntimeEnvironment *RR,uint64_t now)
 {
 	Mutex::Lock _l(_groups_m);
-	for(std::map< MulticastGroup,MulticastGroupStatus >::iterator mm(_groups.begin());mm!=_groups.end();) {
+	for(std::map< std::pair<uint64_t,MulticastGroup>,MulticastGroupStatus >::iterator mm(_groups.begin());mm!=_groups.end();) {
 		// Remove expired outgoing multicasts from multicast TX queue
 		for(std::list<OutboundMulticast>::iterator tx(mm->second.txQueue.begin());tx!=mm->second.txQueue.end();) {
-			if ((tx->expired(now))||(tx->sentToCount() >= limit))
+			if (tx->expired(now))
 				mm->second.txQueue.erase(tx++);
 			else ++tx;
 		}
@@ -152,7 +218,7 @@ void Multicaster::clean(const RuntimeEnvironment *RR,uint64_t now,unsigned int l
 	}
 }
 
-void Multicaster::_add(const RuntimeEnvironment *RR,uint64_t now,MulticastGroupStatus &gs,const Address &learnedFrom,const Address &member)
+void Multicaster::_add(uint64_t now,MulticastGroupStatus &gs,const Address &learnedFrom,const Address &member)
 {
 	// assumes _groups_m is locked
 
-- 
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