2022-10-27 17:50:29 +08:00
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package server
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import (
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"fmt"
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"log"
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"net"
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"time"
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2022-10-27 19:50:06 +08:00
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"github.com/gravitl/netmaker/nm-proxy/common"
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"github.com/gravitl/netmaker/nm-proxy/packet"
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2022-10-27 17:50:29 +08:00
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)
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2022-10-28 01:47:51 +08:00
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var (
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NmProxyServer = &ProxyServer{}
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)
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2022-10-27 17:50:29 +08:00
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const (
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defaultBodySize = 10000
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defaultPort = common.NmProxyPort
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2022-10-27 17:50:29 +08:00
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)
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type Config struct {
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Port int
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BodySize int
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IsRelay bool
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Addr net.Addr
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2022-10-27 17:50:29 +08:00
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}
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type ProxyServer struct {
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Config Config
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Server *net.UDPConn
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}
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// Proxy.Listen - begins listening for packets
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func (p *ProxyServer) Listen() {
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// Buffer with indicated body size
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buffer := make([]byte, 1532)
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for {
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// Read Packet
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n, source, err := p.Server.ReadFromUDP(buffer)
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if err != nil { // in future log errors?
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log.Println("RECV ERROR: ", err)
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continue
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}
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2022-11-04 03:54:48 +08:00
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var srcPeerKeyHash, dstPeerKeyHash string
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n, srcPeerKeyHash, dstPeerKeyHash = packet.ExtractInfo(buffer, n)
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//log.Printf("--------> RECV PKT [DSTPORT: %d], [SRCKEYHASH: %s], SourceIP: [%s] \n", localWgPort, srcPeerKeyHash, source.IP.String())
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if common.IsRelay && dstPeerKeyHash != "" {
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if _, ok := common.WgIfaceKeyMap[dstPeerKeyHash]; !ok {
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log.Println("----------> Relaying######")
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// check for routing map and forward to right proxy
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if remoteMap, ok := common.RelayPeerMap[srcPeerKeyHash]; ok {
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if conf, ok := remoteMap[dstPeerKeyHash]; ok {
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log.Printf("--------> Relaying PKT [ SourceIP: %s:%d ], [ SourceKeyHash: %s ], [ DstIP: %s:%d ], [ DstHashKey: %s ] \n",
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source.IP.String(), source.Port, srcPeerKeyHash, conf.Endpoint.String(), conf.Endpoint.Port, dstPeerKeyHash)
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_, err = NmProxyServer.Server.WriteToUDP(buffer[:n+32], conf.Endpoint)
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if err != nil {
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log.Println("Failed to send to remote: ", err)
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}
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}
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}
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}
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}
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2022-11-04 03:54:48 +08:00
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2022-10-31 12:43:04 +08:00
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if peerInfo, ok := common.PeerKeyHashMap[srcPeerKeyHash]; ok {
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if peers, ok := common.WgIFaceMap[peerInfo.Interface]; ok {
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if peerI, ok := peers[peerInfo.PeerKey]; ok {
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log.Printf("PROXING TO LOCAL!!!---> %s <<<< %s <<<<<<<< %s [[ RECV PKT [SRCKEYHASH: %s], [DSTKEYHASH: %s], SourceIP: [%s] ]]\n",
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peerI.Proxy.LocalConn.RemoteAddr(), peerI.Proxy.LocalConn.LocalAddr(),
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fmt.Sprintf("%s:%d", source.IP.String(), source.Port), srcPeerKeyHash, dstPeerKeyHash, source.IP.String())
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2022-11-02 18:04:15 +08:00
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_, err = peerI.Proxy.LocalConn.Write(buffer[:n])
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if err != nil {
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log.Println("Failed to proxy to Wg local interface: ", err)
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continue
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}
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2022-10-27 17:50:29 +08:00
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}
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}
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2022-10-31 12:43:04 +08:00
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2022-10-27 17:50:29 +08:00
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}
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}
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}
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// Create - creats a proxy listener
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// port - port for proxy to listen on localhost
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// bodySize - default 10000, leave 0 to use default
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// addr - the address for proxy to listen on
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// forwards - indicate address to forward to, {"<address:port>",...} format
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func (p *ProxyServer) CreateProxyServer(port, bodySize int, addr string) (err error) {
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if p == nil {
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p = &ProxyServer{}
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}
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p.Config.Port = port
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p.Config.BodySize = bodySize
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p.setDefaults()
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p.Server, err = net.ListenUDP("udp", &net.UDPAddr{
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Port: p.Config.Port,
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IP: net.ParseIP(addr),
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})
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return
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}
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func (p *ProxyServer) KeepAlive(ip string, port int) {
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for {
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_, _ = p.Server.WriteToUDP([]byte("hello-proxy"), &net.UDPAddr{
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IP: net.ParseIP(ip),
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Port: port,
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})
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//log.Println("Sending MSg: ", ip, port, err)
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time.Sleep(time.Second * 5)
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}
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}
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// Proxy.setDefaults - sets all defaults of proxy listener
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func (p *ProxyServer) setDefaults() {
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p.setDefaultBodySize()
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p.setDefaultPort()
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}
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// Proxy.setDefaultPort - sets default port of Proxy listener if 0
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func (p *ProxyServer) setDefaultPort() {
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if p.Config.Port == 0 {
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p.Config.Port = defaultPort
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}
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}
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// Proxy.setDefaultBodySize - sets default body size of Proxy listener if 0
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func (p *ProxyServer) setDefaultBodySize() {
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if p.Config.BodySize == 0 {
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p.Config.BodySize = defaultBodySize
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}
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}
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