//Copy from golang source
func anyToSockaddr(rsa *syscall.RawSockaddrAny) (syscall.Sockaddr, error) {
switch rsa.Addr.Family {
case syscall.AF_INET:
pp := (*syscall.RawSockaddrInet4)(unsafe.Pointer(rsa))
sa := new(syscall.SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
case syscall.AF_INET6:
pp := (*syscall.RawSockaddrInet6)(unsafe.Pointer(rsa))
sa := new(syscall.SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
sa.ZoneId = pp.Scope_id
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
}
return nil, syscall.EAFNOSUPPORT
}
func ipToSockaddr(family int, ip IP, port int, zone string) (syscall.Sockaddr, error) {
switch family {
case syscall.AF_INET:
if len(ip) == 0 {
ip = IPv4zero
}
if ip = ip.To4(); ip == nil {
return nil, InvalidAddrError("non-IPv4 address")
}
sa := new(syscall.SockaddrInet4)
for i := 0; i < IPv4len; i++ {
sa.Addr[i] = ip[i]
}
sa.Port = port
return sa, nil
case syscall.AF_INET6:
if len(ip) == 0 {
ip = IPv6zero
}
// IPv4 callers use 0.0.0.0 to mean "announce on any available address".
// In IPv6 mode, Linux treats that as meaning "announce on 0.0.0.0",
// which it refuses to do. Rewrite to the IPv6 unspecified address.
if ip.Equal(IPv4zero) {
ip = IPv6zero
}
if ip = ip.To16(); ip == nil {
return nil, InvalidAddrError("non-IPv6 address")
}
sa := new(syscall.SockaddrInet6)
for i := 0; i < IPv6len; i++ {
sa.Addr[i] = ip[i]
}
sa.Port = port
sa.ZoneId = uint32(zoneToInt(zone))
return sa, nil
}
return nil, InvalidAddrError("unexpected socket family")
}