mirror of
https://github.com/e1732a364fed/v2ray_simple.git
synced 2025-10-07 17:51:14 +08:00
131 lines
2.9 KiB
Go
131 lines
2.9 KiB
Go
/*
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Package netLayer contains definitions in network layer AND transport layer.
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本包有 geoip, geosite, udp, readv, splice, relay, route, dns 等相关功能。
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以后如果要添加 kcp 或 raw socket 等底层协议时，或者要控制tcp/udp拨号的细节时，也要在此包里实现.
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*/
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package netLayer
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import (
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"errors"
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"io"
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"log"
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"net"
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"reflect"
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"syscall"
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"github.com/hahahrfool/v2ray_simple/utils"
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"go.uber.org/zap"
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)
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var (
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// 如果机器没有ipv6地址, 就无法联通ipv6, 此时可以在dial时更快拒绝ipv6地址,
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// 避免打印过多错误输出
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machineCanConnectToIpv6 bool
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ErrMachineCantConnectToIpv6 = errors.New("ErrMachineCanConnectToIpv6")
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ErrTimeout = errors.New("timeout")
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)
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//做一些网络层的资料准备工作, 可以优化本包其它函数的调用。
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func Prepare() {
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machineCanConnectToIpv6 = HasIpv6Interface()
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}
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func HasIpv6Interface() bool {
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addrs, err := net.InterfaceAddrs()
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if err != nil {
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if ce := utils.CanLogErr("call net.InterfaceAddrs failed"); ce != nil {
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ce.Write(zap.Error(err))
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} else {
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log.Println("call net.InterfaceAddrs failed", err)
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}
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return false
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}
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for _, address := range addrs {
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if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() && !ipnet.IP.IsPrivate() && !ipnet.IP.IsLinkLocalUnicast() {
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// IsLinkLocalUnicast: something starts with fe80:
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// According to godoc, If ip is not an IPv4 address, To4 returns nil.
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// This means it's ipv6
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if ipnet.IP.To4() == nil {
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utils.Debug("Has Ipv6Interface!")
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return true
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}
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}
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}
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return false
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}
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//net.IPConn, net.TCPConn, net.UDPConn, net.UnixConn
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func IsBasicConn(r interface{}) bool {
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if _, ok := r.(syscall.Conn); ok {
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return true
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}
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return false
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}
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func GetRawConn(reader io.Reader) syscall.RawConn {
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if sc, ok := reader.(syscall.Conn); ok {
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rawConn, err := sc.SyscallConn()
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if err != nil {
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if ce := utils.CanLogDebug("can't convert syscall.Conn to syscall.RawConn"); ce != nil {
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ce.Write(zap.Any("reader", reader), zap.String("type", reflect.TypeOf(reader).String()), zap.Error(err))
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}
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return nil
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}
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return rawConn
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}
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return nil
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}
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//"udp", "udp4", "udp6"
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func IsStrUDP_network(s string) bool {
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switch s {
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case "udp", "udp4", "udp6":
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return true
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}
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return false
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}
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//选择性从 OptionalReader读取, 直到 RemainFirstBufLen 小于等于0 为止；
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// 一般用于与 io.MultiReader 配合
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type ReadWrapper struct {
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net.Conn
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OptionalReader io.Reader
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RemainFirstBufLen int
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}
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func (mc *ReadWrapper) Read(p []byte) (n int, err error) {
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if mc.RemainFirstBufLen > 0 {
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n, err := mc.OptionalReader.Read(p)
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if n > 0 {
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mc.RemainFirstBufLen -= n
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}
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return n, err
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} else {
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return mc.Conn.Read(p)
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}
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}
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func (c *ReadWrapper) WriteBuffers(buffers [][]byte) (int64, error) {
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bigbs, dup := utils.MergeBuffers(buffers)
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n, e := c.Write(bigbs)
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if dup {
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utils.PutPacket(bigbs)
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}
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return int64(n), e
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}
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