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net: Listen on specified multicast address

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Fixes #34728
This commit is contained in:
Daniel Kucera 2021-08-18 07:56:39 +02:00 committed by GitHub
parent 946e2543f8
commit 0226690a9b
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1 changed files with 0 additions and 15 deletions
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15
src/net/sock_posix.go
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@ -208,25 +208,10 @@ func (fd *netFD) listenStream(laddr sockaddr, backlog int, ctrlFn func(string, s
func (fd *netFD) listenDatagram(laddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) error { func (fd *netFD) listenDatagram(laddr sockaddr, ctrlFn func(string, string, syscall.RawConn) error) error {
switch addr := laddr.(type) { switch addr := laddr.(type) {
case *UDPAddr: case *UDPAddr:
// We provide a socket that listens to a wildcard
// address with reusable UDP port when the given laddr
// is an appropriate UDP multicast address prefix.
// This makes it possible for a single UDP listener to
// join multiple different group addresses, for
// multiple UDP listeners that listen on the same UDP
// port to join the same group address.
if addr.IP != nil && addr.IP.IsMulticast() { if addr.IP != nil && addr.IP.IsMulticast() {
if err := setDefaultMulticastSockopts(fd.pfd.Sysfd); err != nil { if err := setDefaultMulticastSockopts(fd.pfd.Sysfd); err != nil {
return err return err
} }
addr := *addr
switch fd.family {
case syscall.AF_INET:
addr.IP = IPv4zero
case syscall.AF_INET6:
addr.IP = IPv6unspecified
}
laddr = &addr
} }
} }
var err error var err error