141 lines
2.8 KiB
Go
141 lines
2.8 KiB
Go
package pingtunnel
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/base64"
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"encoding/binary"
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"encoding/hex"
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"github.com/esrrhs/go-engine/src/loggo"
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"github.com/golang/protobuf/proto"
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"golang.org/x/net/icmp"
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"golang.org/x/net/ipv4"
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"io"
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"net"
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"syscall"
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"time"
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)
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func sendICMP(id int, sequence int, conn icmp.PacketConn, server *net.IPAddr, target string,
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connId string, msgType uint32, data []byte, sproto int, rproto int, key int,
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tcpmode int, tcpmode_buffer_size int, tcpmode_maxwin int, tcpmode_resend_time int) {
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m := &MyMsg{
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Id: connId,
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Type: (int32)(msgType),
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Target: target,
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Data: data,
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Rproto: (int32)(rproto),
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Key: (int32)(key),
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Tcpmode: (int32)(tcpmode),
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TcpmodeBuffersize: (int32)(tcpmode_buffer_size),
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TcpmodeMaxwin: (int32)(tcpmode_maxwin),
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TcpmodeResendTimems: (int32)(tcpmode_resend_time),
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}
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mb, err := proto.Marshal(m)
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if err != nil {
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loggo.Error("sendICMP Marshal MyMsg error %s %s", server.String(), err)
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return
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}
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body := &icmp.Echo{
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ID: id,
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Seq: sequence,
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Data: mb,
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}
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msg := &icmp.Message{
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Type: (ipv4.ICMPType)(sproto),
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Code: 0,
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Body: body,
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}
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bytes, err := msg.Marshal(nil)
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if err != nil {
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loggo.Error("sendICMP Marshal error %s %s", server.String(), err)
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return
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}
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for {
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if _, err := conn.WriteTo(bytes, server); err != nil {
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if neterr, ok := err.(*net.OpError); ok {
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if neterr.Err == syscall.ENOBUFS {
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continue
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}
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}
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loggo.Error("sendICMP WriteTo error %s %s", server.String(), err)
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}
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break
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}
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return
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}
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func recvICMP(conn icmp.PacketConn, recv chan<- *Packet) {
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bytes := make([]byte, 10240)
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for {
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conn.SetReadDeadline(time.Now().Add(time.Millisecond * 100))
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n, srcaddr, err := conn.ReadFrom(bytes)
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if err != nil {
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nerr, ok := err.(net.Error)
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if !ok || !nerr.Timeout() {
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loggo.Error("Error read icmp message %s", err)
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continue
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}
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}
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if n <= 0 {
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continue
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}
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echoId := int(binary.BigEndian.Uint16(bytes[4:6]))
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echoSeq := int(binary.BigEndian.Uint16(bytes[6:8]))
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my := &MyMsg{}
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err = proto.Unmarshal(bytes[8:n], my)
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if err != nil {
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loggo.Debug("Unmarshal MyMsg error: %s", err)
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continue
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}
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if my.Data == nil {
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loggo.Debug("processPacket data nil %s", my.Id)
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continue
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}
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recv <- &Packet{my: my,
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src: srcaddr.(*net.IPAddr),
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echoId: echoId, echoSeq: echoSeq}
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}
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}
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type Packet struct {
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my *MyMsg
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src *net.IPAddr
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echoId int
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echoSeq int
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}
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func UniqueId() string {
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b := make([]byte, 48)
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if _, err := io.ReadFull(rand.Reader, b); err != nil {
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return ""
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}
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return GetMd5String(base64.URLEncoding.EncodeToString(b))
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}
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func GetMd5String(s string) string {
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h := md5.New()
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h.Write([]byte(s))
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return hex.EncodeToString(h.Sum(nil))
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}
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const (
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FRAME_MAX_SIZE int = 888
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FRAME_MAX_ID int = 10000
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)
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