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package turn
import (
"net"
"strconv"
"github.com/pion/transport/vnet"
)
// RelayAddressGeneratorStatic can be used to return static IP address each time a relay is created.
// This can be used when you have a single static IP address that you want to use
type RelayAddressGeneratorStatic struct {
// RelayAddress is the IP returned to the user when the relay is created
RelayAddress net.IP
// Address is passed to Listen/ListenPacket when creating the Relay
Address string
Net *vnet.Net
}
// Validate is caled on server startup and confirms the RelayAddressGenerator is properly configured
func (r *RelayAddressGeneratorStatic) Validate() error {
if r.Net == nil {
r.Net = vnet.NewNet(nil)
}
switch {
case r.RelayAddress == nil:
return errRelayAddressInvalid
case r.Address == "":
return errListeningAddressInvalid
default:
return nil
}
}
// AllocatePacketConn generates a new PacketConn to receive traffic on and the IP/Port to populate the allocation response with
func (r *RelayAddressGeneratorStatic) AllocatePacketConn(network string, requestedPort int) (net.PacketConn, net.Addr, error) {
conn, err := r.Net.ListenPacket(network, r.Address+":"+strconv.Itoa(requestedPort))
if err != nil {
return nil, nil, err
}
// Replace actual listening IP with the user requested one of RelayAddressGeneratorStatic
relayAddr := conn.LocalAddr().(*net.UDPAddr)
relayAddr.IP = r.RelayAddress
return conn, relayAddr, nil
}
// AllocateConn generates a new Conn to receive traffic on and the IP/Port to populate the allocation response with
func (r *RelayAddressGeneratorStatic) AllocateConn(network string, requestedPort int) (net.Conn, net.Addr, error) {
return nil, nil, errTODO
}
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