2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2019 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 "go.cypherpunks.ru/govpn/v7"
27 type UDPSender struct {
32 func (c UDPSender) Write(data []byte) (int, error) {
33 return c.conn.WriteToUDP(data, c.addr)
37 // Buffers for UDP parallel processing
38 udpBufs = make(chan []byte, 1<<8)
42 bind, err := net.ResolveUDPAddr("udp", *bindAddr)
44 log.Fatalln("Can not resolve bind address:", err)
46 conn, err := net.ListenUDP("udp", bind)
48 log.Fatalln("Can not listen on UDP:", err)
50 govpn.BothPrintf(`[udp-listen bind="%s"]`, *bindAddr)
52 udpBufs <- make([]byte, govpn.MTUMax)
55 var raddr *net.UDPAddr
63 var hs *govpn.Handshake
64 var addrPrevI interface{}
66 var peerPrevI interface{}
67 var peerPrev *PeerState
68 var peerID *govpn.PeerID
69 var conf *govpn.PeerConf
72 n, raddr, err = conn.ReadFromUDP(buf)
74 govpn.Printf(`[receive-failed bind="%s" err="%s"]`, *bindAddr, err)
79 psI, exists = peers.Load(addr)
82 go func(peer *govpn.Peer, tap *govpn.TAP, buf []byte, n int) {
83 peer.PktProcess(buf[:n], tap, true)
85 }(ps.peer, ps.tap, buf, n)
89 hsI, exists = handshakes.Load(addr)
91 peerID = idsCache.Find(buf[:n])
93 govpn.Printf(`[identity-unknown bind="%s" addr="%s"]`, *bindAddr, addr)
100 `[conf-get-failed bind="%s" peer="%s"]`,
101 *bindAddr, peerID.String(),
106 hs := govpn.NewHandshake(
108 UDPSender{conn: conn, addr: raddr},
113 handshakes.Store(addr, hs)
117 hs = hsI.(*govpn.Handshake)
118 peer := hs.Server(buf[:n])
124 `[handshake-completed bind="%s" addr="%s" peer="%s"]`,
125 *bindAddr, addr, peerID.String(),
128 handshakes.Delete(addr)
131 udpBufs <- make([]byte, govpn.MTUMax)
132 udpBufs <- make([]byte, govpn.MTUMax)
134 addrPrevI, exists = peersByID.Load(*peer.ID)
136 addrPrev = addrPrevI.(string)
137 peerPrevI, exists = peers.Load(addrPrev)
139 peerPrev = peerPrevI.(*PeerState)
140 exists = peerPrev == nil
144 peerPrev.terminator <- struct{}{}
148 terminator: make(chan struct{}),
150 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
151 govpn.PeerTapProcessor(peer, tap, terminator)
154 }(psNew.peer, psNew.tap, psNew.terminator)
155 peers.Delete(addrPrev)
156 peers.Store(addr, psNew)
157 knownPeers.Delete(addrPrev)
158 knownPeers.Store(addr, &peer)
159 peersByID.Store(*peer.ID, addr)
161 `[rehandshake-completed bind="%s" peer="%s"]`,
162 *bindAddr, peer.ID.String(),
165 go func(addr string, peer *govpn.Peer) {
166 ifaceName, err := callUp(peer.ID, peer.Addr)
170 tap, err := govpn.TAPListen(ifaceName, peer.MTU)
173 `[tap-failed bind="%s" peer="%s" err="%s"]`,
174 *bindAddr, peer.ID.String(), err,
181 terminator: make(chan struct{}),
183 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
184 govpn.PeerTapProcessor(peer, tap, terminator)
187 }(psNew.peer, psNew.tap, psNew.terminator)
188 peers.Store(addr, psNew)
189 knownPeers.Store(addr, &peer)
190 peersByID.Store(*peer.ID, addr)
192 `[peer-created bind="%s" peer="%s"]`,