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remove duplicate tcp connections

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This commit is contained in:
Arceliar 2018-02-17 20:44:23 -06:00
parent 25f00c1c7a
commit 8ba11b86bb
1 changed files with 38 additions and 10 deletions
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44
src/yggdrasil/tcp.go
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@ -23,11 +23,14 @@ type tcpInterface struct {
serv *net.TCPListener
mutex sync.Mutex // Protecting the below
calls map[string]struct{}
conns map[tcpInfo](chan struct{})
}
type tcpKeys struct {
type tcpInfo struct {
box boxPubKey
sig sigPubKey
localAddr string // net.IPAddr.String(), not TCPAddr, don't care about port
remoteAddr string
}
func (iface *tcpInterface) init(core *Core, addr string) {
@ -41,6 +44,7 @@ func (iface *tcpInterface) init(core *Core, addr string) {
panic(err)
}
iface.calls = make(map[string]struct{})
iface.conns = make(map[tcpInfo](chan struct{}))
go iface.listener()
}
@ -102,8 +106,8 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
if n < len(keys) { /*panic("Partial key packet?") ;*/
return
}
ks := tcpKeys{}
if !tcp_chop_keys(&ks.box, &ks.sig, &keys) { /*panic("Invalid key packet?") ;*/
info := tcpInfo{}
if !tcp_chop_keys(&info.box, &info.sig, &keys) { /*panic("Invalid key packet?") ;*/
return
}
// Quit the parent call if this is a connection to ourself
@ -115,16 +119,40 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
}
return true
}
if equiv(ks.box[:], iface.core.boxPub[:]) {
if equiv(info.box[:], iface.core.boxPub[:]) {
return
} // testing
if equiv(ks.sig[:], iface.core.sigPub[:]) {
if equiv(info.sig[:], iface.core.sigPub[:]) {
return
}
// Check if we already have a connection to this node, close and block if yes
local := sock.LocalAddr().(*net.TCPAddr)
laddr := net.IPAddr{
IP: local.IP,
Zone: local.Zone,
}
info.localAddr = laddr.String()
remote := sock.RemoteAddr().(*net.TCPAddr)
raddr := net.IPAddr{
IP: remote.IP,
Zone: remote.Zone,
}
info.remoteAddr = raddr.String()
iface.mutex.Lock()
if blockChan, isIn := iface.conns[info]; isIn {
iface.mutex.Unlock()
sock.Close()
<-blockChan
return
}
blockChan := make(chan struct{})
iface.conns[info] = blockChan
iface.mutex.Unlock()
defer close(blockChan)
// Note that multiple connections to the same node are allowed
// E.g. over different interfaces
linkIn := make(chan []byte, 1)
p := iface.core.peers.newPeer(&ks.box, &ks.sig) //, in, out)
p := iface.core.peers.newPeer(&info.box, &info.sig) //, in, out)
in := func(bs []byte) {
p.handlePacket(bs, linkIn)
}
@ -197,8 +225,8 @@ func (iface *tcpInterface) handler(sock *net.TCPConn) {
p.core.peers.mutex.Unlock()
close(linkIn)
}()
them := sock.RemoteAddr()
themNodeID := getNodeID(&ks.box)
them := sock.RemoteAddr().(*net.TCPAddr)
themNodeID := getNodeID(&info.box)
themAddr := address_addrForNodeID(themNodeID)
themAddrString := net.IP(themAddr[:]).String()
themString := fmt.Sprintf("%s@%s", themAddrString, them)