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Put back legacy code to listen for LAN announcements to support same network location with pre-1.0.4 clients.

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This commit is contained in:
Adam Ierymenko 2015-07-13 08:33:02 -07:00
parent d78e3bb307
commit fe20f0d7cd
2 changed files with 26 additions and 6 deletions
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23
node/Switch.cpp
View File

@ -65,7 +65,8 @@ static const char *etherTypeName(const unsigned int etherType)
#endif // ZT_TRACE
Switch::Switch(const RuntimeEnvironment *renv) :
RR(renv)
RR(renv),
_lastBeaconResponse(0)
{
}
@ -76,7 +77,25 @@ Switch::~Switch()
void Switch::onRemotePacket(const InetAddress &fromAddr,const void *data,unsigned int len)
{
try {
if (len > ZT_PROTO_MIN_FRAGMENT_LENGTH) {
if (len == 13) {
/* LEGACY: before VERB_PUSH_DIRECT_PATHS, peers used broadcast
* announcements on the LAN to solve the 'same network problem.' We
* no longer send these, but we'll listen for them for a while to
* locate peers with versions <1.0.4. */
Address beaconAddr(reinterpret_cast<const char *>(data) + 8,5);
if (beaconAddr == RR->identity.address())
return;
SharedPtr<Peer> peer(RR->topology->getPeer(beaconAddr));
if (peer) { // we'll only respond to beacons from known peers
const uint64_t now = RR->node->now();
if ((now - _lastBeaconResponse) >= 2500) { // limit rate of responses
_lastBeaconResponse = now;
Packet outp(peer->address(),RR->identity.address(),Packet::VERB_NOP);
outp.armor(peer->key(),false);
RR->node->putPacket(fromAddr,outp.data(),outp.size());
}
}
} else if (len > ZT_PROTO_MIN_FRAGMENT_LENGTH) {
if (((const unsigned char *)data)[ZT_PACKET_FRAGMENT_IDX_FRAGMENT_INDICATOR] == ZT_PACKET_FRAGMENT_INDICATOR) {
_handleRemotePacketFragment(fromAddr,data,len);
} else if (len >= ZT_PROTO_MIN_PACKET_LENGTH) {

9
node/Switch.hpp
View File

@ -99,20 +99,20 @@ public:
/**
* Send a packet to a ZeroTier address (destination in packet)
*
*
* The packet must be fully composed with source and destination but not
* yet encrypted. If the destination peer is known the packet
* is sent immediately. Otherwise it is queued and a WHOIS is dispatched.
*
* The packet may be compressed. Compression isn't done here.
*
*
* Needless to say, the packet's source must be this node. Otherwise it
* won't be encrypted right. (This is not used for relaying.)
*
* The network ID should only be specified for frames and other actual
* network traffic. Other traffic such as controller requests and regular
* protocol messages should specify zero.
*
*
* @param packet Packet to send
* @param encrypt Encrypt packet payload? (always true except for HELLO)
* @param nwid Related network ID or 0 if message is not in-network traffic
@ -168,7 +168,7 @@ public:
/**
* Perform retries and other periodic timer tasks
*
*
* This can return a very long delay if there are no pending timer
* tasks. The caller should cap this comparatively vs. other values.
*
@ -184,6 +184,7 @@ private:
bool _trySend(const Packet &packet,bool encrypt,uint64_t nwid);
const RuntimeEnvironment *const RR;
uint64_t _lastBeaconResponse;
// Outsanding WHOIS requests and how many retries they've undergone
struct WhoisRequest