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UDPConn_bind.go
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UDPConn_bind.go
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// +build !windows
/*
* Copyright (c) 2018, Psiphon Inc.
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package psiphon
import (
"fmt"
"net"
"os"
"syscall"
"github.com/Psiphon-Labs/psiphon-tunnel-core/psiphon/common"
)
func newUDPConn(domain int, config *DialConfig) (net.PacketConn, error) {
// TODO: use https://golang.org/pkg/net/#Dialer.Control, introduced in Go 1.11?
socketFD, err := syscall.Socket(domain, syscall.SOCK_DGRAM, 0)
if err != nil {
return nil, common.ContextError(err)
}
syscall.CloseOnExec(socketFD)
setAdditionalSocketOptions(socketFD)
if config.DeviceBinder != nil {
err := bindToDeviceCallWrapper(config.DeviceBinder, socketFD)
if err != nil {
syscall.Close(socketFD)
return nil, common.ContextError(fmt.Errorf("BindToDevice failed: %s", err))
}
}
// Convert the socket fd to a net.PacketConn
// This code block is from:
// https://github.com/golang/go/issues/6966
file := os.NewFile(uintptr(socketFD), "")
conn, err := net.FilePacketConn(file) // net.FilePackateConn() dups socketFD
file.Close() // file.Close() closes socketFD
if err != nil {
return nil, common.ContextError(err)
}
return conn, nil
}