mirror of
https://github.com/xtaci/kcp-go.git
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77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
// The MIT License (MIT)
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//
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// Copyright (c) 2015 xtaci
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//go:build linux
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package kcp
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import (
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"net"
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"syscall"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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)
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type (
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platform struct {
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batchConn batchConn
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}
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// udpConn is an interface implemented by net.UDPConn.
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// It can be used for interface assertions to check if a net.Conn is a UDP connection.
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udpConn interface {
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SyscallConn() (syscall.RawConn, error)
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ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
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}
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// batchConn defines the interface used in batch IO
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batchConn interface {
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WriteBatch(ms []ipv4.Message, flags int) (int, error)
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ReadBatch(ms []ipv4.Message, flags int) (int, error)
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}
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)
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// newBatchConn creates a batchConn based on the IP version of the provided net.PacketConn.
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func newBatchConn(conn net.PacketConn) batchConn {
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if _, ok := conn.(udpConn); !ok {
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return nil
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}
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// Resolve the local UDP address to determine IP version
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addr, err := net.ResolveUDPAddr("udp", conn.LocalAddr().String())
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if err != nil {
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return nil
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}
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// Determine if the connection is IPv4 or IPv6 based on the local address
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if addr.IP.To4() != nil {
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return ipv4.NewPacketConn(conn)
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}
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return ipv6.NewPacketConn(conn)
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}
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func (sess *UDPSession) initPlatform() {
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sess.platform.batchConn = newBatchConn(sess.conn)
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}
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