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Merge pull request #104 from Arceliar/multicast

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Enable multicast on interfaces that come up after startup
This commit is contained in:
Neil Alexander 2018-06-08 22:01:26 +01:00 committed by GitHub
commit 89757ab5ec
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2 changed files with 36 additions and 31 deletions
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2
src/yggdrasil/admin.go
View File

@ -175,7 +175,7 @@ func (a *admin) init(c *Core, listenaddr string) {
})
a.addHandler("getMulticastInterfaces", []string{}, func(in admin_info) (admin_info, error) {
var intfs []string
for _, v := range a.core.multicast.interfaces {
for _, v := range a.core.multicast.interfaces() {
intfs = append(intfs, v.Name)
}
return admin_info{"multicast_interfaces": intfs}, nil

65
src/yggdrasil/multicast.go
View File

@ -7,10 +7,9 @@ import "fmt"
import "golang.org/x/net/ipv6"
type multicast struct {
core *Core
sock *ipv6.PacketConn
groupAddr string
interfaces []net.Interface
core *Core
sock *ipv6.PacketConn
groupAddr string
}
func (m *multicast) init(core *Core) {
@ -21,31 +20,7 @@ func (m *multicast) init(core *Core) {
return
}
// 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 {
if expr.MatchString(iface.Name) {
m.interfaces = append(m.interfaces, iface)
}
}
}
m.core.log.Println("Found", len(m.interfaces), "multicast interface(s)")
m.core.log.Println("Found", len(m.interfaces()), "multicast interface(s)")
}
func (m *multicast) start() error {
@ -75,6 +50,36 @@ func (m *multicast) start() error {
return nil
}
func (m *multicast) interfaces() []net.Interface {
// Ask the system for network interfaces
var interfaces []net.Interface
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 {
if expr.MatchString(iface.Name) {
interfaces = append(interfaces, iface)
}
}
}
return interfaces
}
func (m *multicast) announce() {
groupAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
if err != nil {
@ -88,7 +93,7 @@ func (m *multicast) announce() {
panic(err)
}
for {
for _, iface := range m.interfaces {
for _, iface := range m.interfaces() {
m.sock.JoinGroup(&iface, groupAddr)
//err := n.sock.JoinGroup(&iface, groupAddr)
//if err != nil { panic(err) }