mirror of
https://github.com/xtaci/kcp-go.git
synced 2026-10-19 16:14:38 +00:00
xtaci
8fd6d90d50
- Reuse buffers and use rng.Read to cut per-iteration allocations in random echo test - Separate RNG for payload length to keep data stream deterministic - Optimize UDP source validation by comparing UDPAddr directly to avoid per-packet String allocation
101 lines
2.6 KiB
Go
101 lines
2.6 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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package kcp
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import (
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"net"
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"sync/atomic"
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"github.com/pkg/errors"
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)
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func sameUDPAddr(a, b *net.UDPAddr) bool {
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if a == nil || b == nil {
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return false
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}
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if a.Port != b.Port || a.Zone != b.Zone {
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return false
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}
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return a.IP.Equal(b.IP)
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}
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// defaultReadLoop is the standard procedure for reading from a connection
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func (s *UDPSession) defaultReadLoop() {
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buf := make([]byte, mtuLimit)
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var src *net.UDPAddr
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var srcStr string
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if s.remote != nil {
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if udp, ok := s.remote.(*net.UDPAddr); ok {
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src = udp
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} else {
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srcStr = s.remote.String()
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}
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}
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for {
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n, addr, err := s.conn.ReadFrom(buf)
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if err != nil {
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s.notifyReadError(errors.WithStack(err))
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return
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}
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if s.isClosed() {
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return
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}
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// make sure the packet is from the same source
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if src == nil && srcStr == "" { // set source address if nil
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if udp, ok := addr.(*net.UDPAddr); ok {
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src = udp
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} else {
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srcStr = addr.String()
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}
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} else if src != nil {
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udp, ok := addr.(*net.UDPAddr)
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if !ok || !sameUDPAddr(src, udp) {
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atomic.AddUint64(&DefaultSnmp.InErrs, 1)
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continue
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}
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} else if addr.String() != srcStr {
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atomic.AddUint64(&DefaultSnmp.InErrs, 1)
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continue
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}
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s.packetInput(buf[:n])
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}
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}
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// defaultReadLoop is the standard procedure for reading and accepting connections on a listener
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func (l *Listener) defaultMonitor() {
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buf := make([]byte, mtuLimit)
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for {
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n, from, err := l.conn.ReadFrom(buf)
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if err != nil {
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l.notifyReadError(errors.WithStack(err))
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return
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}
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l.packetInput(buf[:n], from)
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}
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}
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