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package main
import (
"errors"
"net"
"time"
)
func parseEndpoint(s string) (*net.UDPAddr, error) {
// ensure that the host is an IP address
host, _, err := net.SplitHostPort(s)
if err != nil {
return nil, err
}
if ip := net.ParseIP(host); ip == nil {
return nil, errors.New("Failed to parse IP address: " + host)
}
// parse address and port
addr, err := net.ResolveUDPAddr("udp", s)
if err != nil {
return nil, err
}
return addr, err
}
func updateUDPConn(device *Device) error {
netc := &device.net
netc.mutex.Lock()
defer netc.mutex.Unlock()
// close existing connection
if netc.conn != nil {
netc.conn.Close()
netc.conn = nil
// We need for that fd to be closed in all other go routines, which
// means we have to wait. TODO: find less horrible way of doing this.
time.Sleep(time.Second / 2)
}
// open new connection
if device.tun.isUp.Get() {
// listen on new address
conn, err := net.ListenUDP("udp", netc.addr)
if err != nil {
return err
}
// set fwmark
err = SetMark(netc.conn, netc.fwmark)
if err != nil {
return err
}
// retrieve port (may have been chosen by kernel)
addr := conn.LocalAddr()
netc.conn = conn
netc.addr, _ = net.ResolveUDPAddr(
addr.Network(),
addr.String(),
)
// notify goroutines
signalSend(device.signal.newUDPConn)
}
return nil
}
func closeUDPConn(device *Device) {
netc := &device.net
netc.mutex.Lock()
if netc.conn != nil {
netc.conn.Close()
}
netc.mutex.Unlock()
signalSend(device.signal.newUDPConn)
}
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