You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.5 KiB
58 lines
1.5 KiB
// +build !windows,!plan9
|
|
|
|
package dns
|
|
|
|
import (
|
|
"net"
|
|
"syscall"
|
|
)
|
|
|
|
// SessionUDP holds the remote address and the associated
|
|
// out-of-band data.
|
|
type SessionUDP struct {
|
|
raddr *net.UDPAddr
|
|
context []byte
|
|
}
|
|
|
|
// RemoteAddr returns the remote network address.
|
|
func (s *SessionUDP) RemoteAddr() net.Addr { return s.raddr }
|
|
|
|
// setUDPSocketOptions sets the UDP socket options.
|
|
// This function is implemented on a per platform basis. See udp_*.go for more details
|
|
func setUDPSocketOptions(conn *net.UDPConn) error {
|
|
sa, err := getUDPSocketName(conn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
switch sa.(type) {
|
|
case *syscall.SockaddrInet6:
|
|
v6only, err := getUDPSocketOptions6Only(conn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
setUDPSocketOptions6(conn)
|
|
if !v6only {
|
|
setUDPSocketOptions4(conn)
|
|
}
|
|
case *syscall.SockaddrInet4:
|
|
setUDPSocketOptions4(conn)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ReadFromSessionUDP acts just like net.UDPConn.ReadFrom(), but returns a session object instead of a
|
|
// net.UDPAddr.
|
|
func ReadFromSessionUDP(conn *net.UDPConn, b []byte) (int, *SessionUDP, error) {
|
|
oob := make([]byte, 40)
|
|
n, oobn, _, raddr, err := conn.ReadMsgUDP(b, oob)
|
|
if err != nil {
|
|
return n, nil, err
|
|
}
|
|
return n, &SessionUDP{raddr, oob[:oobn]}, err
|
|
}
|
|
|
|
// WriteToSessionUDP acts just like net.UDPConn.WritetTo(), but uses a *SessionUDP instead of a net.Addr.
|
|
func WriteToSessionUDP(conn *net.UDPConn, b []byte, session *SessionUDP) (int, error) {
|
|
n, _, err := conn.WriteMsgUDP(b, session.context, session.raddr)
|
|
return n, err
|
|
}
|
|
|