56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
// +build !windows
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package dns
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import (
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"net"
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"syscall"
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)
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type sessionUDP struct {
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raddr *net.UDPAddr
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context []byte
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}
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func (s *sessionUDP) RemoteAddr() net.Addr { return s.raddr }
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// setUDPSocketOptions sets the UDP socket options.
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// This function is implemented on a per platform basis. See udp_*.go for more details
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func setUDPSocketOptions(conn *net.UDPConn) error {
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sa, err := getUDPSocketName(conn)
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if err != nil {
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return err
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}
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switch sa.(type) {
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case *syscall.SockaddrInet6:
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v6only, err := getUDPSocketOptions6Only(conn)
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if err != nil {
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return err
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}
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setUDPSocketOptions6(conn)
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if !v6only {
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setUDPSocketOptions4(conn)
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}
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case *syscall.SockaddrInet4:
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setUDPSocketOptions4(conn)
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}
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return nil
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}
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// readFromSessionUDP acts just like net.UDPConn.ReadFrom(), but returns a session object instead of a
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// net.UDPAddr.
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func readFromSessionUDP(conn *net.UDPConn, b []byte) (int, *sessionUDP, error) {
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oob := make([]byte, 40)
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n, oobn, _, raddr, err := conn.ReadMsgUDP(b, oob)
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if err != nil {
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return n, nil, err
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}
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return n, &sessionUDP{raddr, oob[:oobn]}, err
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}
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// writeToSessionUDP acts just like net.UDPConn.WritetTo(), but uses a *sessionUDP instead of a net.Addr.
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func writeToSessionUDP(conn *net.UDPConn, b []byte, session *sessionUDP) (int, error) {
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n, _, err := conn.WriteMsgUDP(b, session.context, session.raddr)
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return n, err
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}
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