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Move multicasting into yggdrasil package

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This commit is contained in:
Neil Alexander 2018-05-23 11:13:53 +01:00
parent 388ae09fca
commit 6f79184c9b
No known key found for this signature in database
GPG Key ID: A02A2019A2BB0944
6 changed files with 196 additions and 129 deletions
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4
src/yggdrasil/config/config.go
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@ -10,8 +10,8 @@ type NodeConfig struct {
BoxPriv string `json:"EncryptionPrivateKey" comment:"Your private encryption key (do not share this with anyone!)"`
SigPub string `json:"SigningPublicKey" comment:"Your public signing key"`
SigPriv string `json:"SigningPrivateKey" comment:"Your private signing key (do not share this with anyone!)"`
Multicast bool `comment:"Enable or disable automatic peer discovery on the same LAN using multicast"`
LinkLocal string `json:"MulticastInterfaces" comment:"Regex for which interfaces multicast peer discovery should be enabled on"`
Multicast bool `json:"MulticastEnabled,omitempty" comment:"Enable or disable automatic peer discovery on the same LAN using multicast"`
LinkLocal []string `json:"MulticastInterfaces" comment:"Regexes for which interfaces multicast peer discovery should be enabled\non. If none specified, multicast peer discovery is disabled"`
IfName string `comment:"Local network interface name for TUN/TAP adapter, or \"auto\", or \"none\""`
IfTAPMode bool `comment:"Set local network interface to TAP mode rather than TUN mode (if supported\nby your platform, option will be ignored if not)"`
IfMTU int `comment:"Maximux Transmission Unit (MTU) size for your local network interface"`

4
src/yggdrasil/core.go
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@ -19,10 +19,11 @@ type Core struct {
tun tunDevice
admin admin
searches searches
multicast multicast
tcp *tcpInterface
udp *udpInterface
log *log.Logger
ifceExpr *regexp.Regexp // the zone of link-local IPv6 peers must match this
ifceExpr []*regexp.Regexp // the zone of link-local IPv6 peers must match this
}
func (c *Core) Init() {
@ -49,6 +50,7 @@ func (c *Core) init(bpub *boxPubKey,
c.searches.init(c)
c.dht.init(c)
c.sessions.init(c)
c.multicast.init(c)
c.peers.init(c)
c.router.init(c)
c.switchTable.init(c, c.sigPub) // TODO move before peers? before router?

9
src/yggdrasil/debug.go
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@ -387,6 +387,13 @@ func (c *Core) DEBUG_setupAndStartAdminInterface(addrport string) {
c.admin = a
}
func (c *Core) DEBUG_setupAndStartMulticastInterface() {
m := multicast{}
m.init(c)
c.multicast = m
m.Start()
}
////////////////////////////////////////////////////////////////////////////////
func (c *Core) DEBUG_setLogger(log *log.Logger) {
@ -394,7 +401,7 @@ func (c *Core) DEBUG_setLogger(log *log.Logger) {
}
func (c *Core) DEBUG_setIfceExpr(expr *regexp.Regexp) {
c.ifceExpr = expr
c.ifceExpr = append(c.ifceExpr, expr)
}
func (c *Core) DEBUG_addAllowedBoxPub(boxStr string) {

160
src/yggdrasil/multicast.go Normal file
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@ -0,0 +1,160 @@
package yggdrasil
import "net"
import "time"
import "fmt"
import "golang.org/x/net/ipv6"
type multicast struct {
core *Core
sock *ipv6.PacketConn
groupAddr string
interfaces []net.Interface
}
func (m *multicast) init(core *Core) {
m.core = core
m.groupAddr = "[ff02::114]:9001"
// Ask the system for network interfaces
allifaces, err := net.Interfaces()
if err != nil {
panic(err)
}
// Work out which interfaces to announce on
for _, iface := range allifaces {
if iface.Flags & net.FlagUp == 0 {
// Ignore interfaces that are down
continue
}
if iface.Flags & net.FlagMulticast == 0 {
// Ignore non-multicast interfaces
continue
}
if iface.Flags & net.FlagPointToPoint != 0 {
// Ignore point-to-point interfaces
continue
}
for _, expr := range m.core.ifceExpr {
m.core.log.Println(expr)
if expr.MatchString(iface.Name) {
m.core.log.Println(iface.Name, "matched", expr)
m.interfaces = append(m.interfaces, iface)
}
}
}
m.core.log.Println("Found", len(m.interfaces), "multicast interfaces")
}
func (m *multicast) Start() {
if len(m.core.ifceExpr) == 0 {
m.core.log.Println("Not starting multicast discovery")
} else {
m.core.log.Println("Starting multicast discovery...")
addr, err := net.ResolveUDPAddr("udp", m.groupAddr)
if err != nil {
panic(err)
}
listenString := fmt.Sprintf("[::]:%v", addr.Port)
conn, err := net.ListenPacket("udp6", listenString)
if err != nil {
panic(err)
}
//defer conn.Close() // Let it close on its own when the application exits
m.sock = ipv6.NewPacketConn(conn)
if err = m.sock.SetControlMessage(ipv6.FlagDst, true); err != nil {
// Windows can't set this flag, so we need to handle it in other ways
//panic(err)
}
go m.listen()
go m.announce()
}
}
func (m *multicast) announce() {
groupAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
if err != nil {
panic(err)
}
var anAddr net.TCPAddr
myAddr := m.core.DEBUG_getGlobalTCPAddr()
anAddr.Port = myAddr.Port
destAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
if err != nil {
panic(err)
}
for {
for _, iface := range m.interfaces {
m.sock.JoinGroup(&iface, groupAddr)
//err := n.sock.JoinGroup(&iface, groupAddr)
//if err != nil { panic(err) }
addrs, err := iface.Addrs()
if err != nil {
panic(err)
}
for _, addr := range addrs {
addrIP, _, _ := net.ParseCIDR(addr.String())
if addrIP.To4() != nil {
continue
} // IPv6 only
if !addrIP.IsLinkLocalUnicast() {
continue
}
anAddr.IP = addrIP
anAddr.Zone = iface.Name
destAddr.Zone = iface.Name
msg := []byte(anAddr.String())
m.sock.WriteTo(msg, nil, destAddr)
break
}
time.Sleep(time.Second)
}
time.Sleep(time.Second)
}
}
func (m *multicast) listen() {
groupAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
if err != nil {
panic(err)
}
bs := make([]byte, 2048)
for {
nBytes, rcm, fromAddr, err := m.sock.ReadFrom(bs)
if err != nil {
panic(err)
}
//if rcm == nil { continue } // wat
//fmt.Println("DEBUG:", "packet from:", fromAddr.String())
if rcm != nil {
// Windows can't set the flag needed to return a non-nil value here
// So only make these checks if we get something useful back
// TODO? Skip them always, I'm not sure if they're really needed...
if !rcm.Dst.IsLinkLocalMulticast() {
continue
}
if !rcm.Dst.Equal(groupAddr.IP) {
continue
}
}
anAddr := string(bs[:nBytes])
addr, err := net.ResolveTCPAddr("tcp6", anAddr)
if err != nil {
panic(err)
continue
} // Panic for testing, remove later
from := fromAddr.(*net.UDPAddr)
//fmt.Println("DEBUG:", "heard:", addr.IP.String(), "from:", from.IP.String())
if addr.IP.String() != from.IP.String() {
continue
}
addr.Zone = from.Zone
saddr := addr.String()
//if _, isIn := n.peers[saddr]; isIn { continue }
//n.peers[saddr] = struct{}{}
m.core.DEBUG_addTCPConn(saddr)
//fmt.Println("DEBUG:", "added multicast peer:", saddr)
}
}

12
src/yggdrasil/udp.go
View File

@ -341,11 +341,17 @@ func (iface *udpInterface) reader() {
if them.isValid() {
continue
}
if udpAddr.IP.IsLinkLocalUnicast() &&
!iface.core.ifceExpr.MatchString(udpAddr.Zone) {
continue
if udpAddr.IP.IsLinkLocalUnicast() {
if len(iface.core.ifceExpr) == 0 {
break
}
for _, expr := range iface.core.ifceExpr {
if expr.MatchString(udpAddr.Zone) {
iface.handleKeys(msg, addr)
break
}
}
}
case udp_isClose(msg):
iface.handleClose(msg, addr)
default:

134
yggdrasil.go
View File

@ -17,8 +17,6 @@ import "net/http"
import "log"
import "runtime"
import "golang.org/x/net/ipv6"
import "yggdrasil"
import "yggdrasil/config"
@ -31,7 +29,6 @@ type Core = yggdrasil.Core
type node struct {
core Core
sock *ipv6.PacketConn
}
func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
@ -53,11 +50,6 @@ func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
}
n.core.DEBUG_init(boxPub, boxPriv, sigPub, sigPriv)
n.core.DEBUG_setLogger(logger)
ifceExpr, err := regexp.Compile(cfg.LinkLocal)
if err != nil {
panic(err)
}
n.core.DEBUG_setIfceExpr(ifceExpr)
logger.Println("Starting interface...")
n.core.DEBUG_setupAndStartGlobalTCPInterface(cfg.Listen) // Listen for peers on TCP
@ -69,6 +61,17 @@ func (n *node) init(cfg *nodeConfig, logger *log.Logger) {
for _, pBoxStr := range cfg.AllowedBoxPubs {
n.core.DEBUG_addAllowedBoxPub(pBoxStr)
}
logger.Println(cfg.LinkLocal)
for _, ll := range cfg.LinkLocal {
logger.Println("Adding expression", ll)
ifceExpr, err := regexp.Compile(ll)
if err != nil {
panic(err)
}
logger.Println("Added expression", ifceExpr)
n.core.DEBUG_setIfceExpr(ifceExpr)
}
n.core.DEBUG_setupAndStartMulticastInterface()
go func() {
if len(cfg.Peers) == 0 {
@ -102,8 +105,8 @@ func generateConfig(isAutoconf bool) *nodeConfig {
cfg.SigPriv = hex.EncodeToString(spriv[:])
cfg.Peers = []string{}
cfg.AllowedBoxPubs = []string{}
cfg.Multicast = true
cfg.LinkLocal = ""
cfg.Multicast = false
cfg.LinkLocal = []string{}
cfg.IfName = core.DEBUG_GetTUNDefaultIfName()
cfg.IfMTU = core.DEBUG_GetTUNDefaultIfMTU()
cfg.IfTAPMode = core.DEBUG_GetTUNDefaultIfTAPMode()
@ -120,98 +123,6 @@ func doGenconf() string {
return string(bs)
}
var multicastAddr = "[ff02::114]:9001"
func (n *node) listen() {
groupAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
if err != nil {
panic(err)
}
bs := make([]byte, 2048)
for {
nBytes, rcm, fromAddr, err := n.sock.ReadFrom(bs)
if err != nil {
panic(err)
}
//if rcm == nil { continue } // wat
//fmt.Println("DEBUG:", "packet from:", fromAddr.String())
if rcm != nil {
// Windows can't set the flag needed to return a non-nil value here
// So only make these checks if we get something useful back
// TODO? Skip them always, I'm not sure if they're really needed...
if !rcm.Dst.IsLinkLocalMulticast() {
continue
}
if !rcm.Dst.Equal(groupAddr.IP) {
continue
}
}
anAddr := string(bs[:nBytes])
addr, err := net.ResolveTCPAddr("tcp6", anAddr)
if err != nil {
panic(err)
continue
} // Panic for testing, remove later
from := fromAddr.(*net.UDPAddr)
//fmt.Println("DEBUG:", "heard:", addr.IP.String(), "from:", from.IP.String())
if addr.IP.String() != from.IP.String() {
continue
}
addr.Zone = from.Zone
saddr := addr.String()
//if _, isIn := n.peers[saddr]; isIn { continue }
//n.peers[saddr] = struct{}{}
n.core.DEBUG_addTCPConn(saddr)
//fmt.Println("DEBUG:", "added multicast peer:", saddr)
}
}
func (n *node) announce() {
groupAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
if err != nil {
panic(err)
}
var anAddr net.TCPAddr
myAddr := n.core.DEBUG_getGlobalTCPAddr()
anAddr.Port = myAddr.Port
destAddr, err := net.ResolveUDPAddr("udp6", multicastAddr)
if err != nil {
panic(err)
}
for {
ifaces, err := net.Interfaces()
if err != nil {
panic(err)
}
for _, iface := range ifaces {
n.sock.JoinGroup(&iface, groupAddr)
//err := n.sock.JoinGroup(&iface, groupAddr)
//if err != nil { panic(err) }
addrs, err := iface.Addrs()
if err != nil {
panic(err)
}
for _, addr := range addrs {
addrIP, _, _ := net.ParseCIDR(addr.String())
if addrIP.To4() != nil {
continue
} // IPv6 only
if !addrIP.IsLinkLocalUnicast() {
continue
}
anAddr.IP = addrIP
anAddr.Zone = iface.Name
destAddr.Zone = iface.Name
msg := []byte(anAddr.String())
n.sock.WriteTo(msg, nil, destAddr)
break
}
time.Sleep(time.Second)
}
time.Sleep(time.Second)
}
}
var pprof = flag.Bool("pprof", false, "Run pprof, see http://localhost:6060/debug/pprof/")
var genconf = flag.Bool("genconf", false, "print a new config to stdout")
var useconf = flag.Bool("useconf", false, "read config from stdin")
@ -277,25 +188,6 @@ func main() {
subnet = append(subnet, 0, 0, 0, 0, 0, 0, 0, 0)
logger.Printf("Your IPv6 address is %s", net.IP(address).String())
logger.Printf("Your IPv6 subnet is %s/64", net.IP(subnet).String())
if cfg.Multicast {
addr, err := net.ResolveUDPAddr("udp", multicastAddr)
if err != nil {
panic(err)
}
listenString := fmt.Sprintf("[::]:%v", addr.Port)
conn, err := net.ListenPacket("udp6", listenString)
if err != nil {
panic(err)
}
//defer conn.Close() // Let it close on its own when the application exits
n.sock = ipv6.NewPacketConn(conn)
if err = n.sock.SetControlMessage(ipv6.FlagDst, true); err != nil {
// Windows can't set this flag, so we need to handle it in other ways
//panic(err)
}
go n.listen()
go n.announce()
}
// Catch interrupt to exit gracefully
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)