2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2017 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, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 "cypherpunks.ru/govpn"
28 type UDPSender struct {
33 func (c UDPSender) Write(data []byte) (int, error) {
34 return c.conn.WriteToUDP(data, c.addr)
38 // Buffers for UDP parallel processing
39 udpBufs = make(chan []byte, 1<<8)
43 bind, err := net.ResolveUDPAddr("udp", *bindAddr)
45 log.Fatalln("Can not resolve bind address:", err)
47 conn, err := net.ListenUDP("udp", bind)
49 log.Fatalln("Can not listen on UDP:", err)
51 govpn.BothPrintf(`[udp-listen bind="%s"]`, *bindAddr)
53 udpBufs <- make([]byte, govpn.MTUMax)
56 var raddr *net.UDPAddr
64 var hs *govpn.Handshake
65 var addrPrevI interface{}
67 var peerPrevI interface{}
68 var peerPrev *PeerState
69 var peerID *govpn.PeerID
70 var conf *govpn.PeerConf
73 n, raddr, err = conn.ReadFromUDP(buf)
75 govpn.Printf(`[receive-failed bind="%s" err="%s"]`, *bindAddr, err)
80 psI, exists = peers.Load(addr)
83 go func(peer *govpn.Peer, tap *govpn.TAP, buf []byte, n int) {
84 peer.PktProcess(buf[:n], tap, true)
86 }(ps.peer, ps.tap, buf, n)
90 hsI, exists = handshakes.Load(addr)
92 peerID = idsCache.Find(buf[:n])
94 govpn.Printf(`[identity-unknown bind="%s" addr="%s"]`, *bindAddr, addr)
101 `[conf-get-failed bind="%s" peer="%s"]`,
102 *bindAddr, peerID.String(),
107 hs := govpn.NewHandshake(
109 UDPSender{conn: conn, addr: raddr},
114 handshakes.Store(addr, hs)
118 hs = hsI.(*govpn.Handshake)
119 peer := hs.Server(buf[:n])
125 `[handshake-completed bind="%s" addr="%s" peer="%s"]`,
126 *bindAddr, addr, peerID.String(),
129 handshakes.Delete(addr)
132 udpBufs <- make([]byte, govpn.MTUMax)
133 udpBufs <- make([]byte, govpn.MTUMax)
135 addrPrevI, exists = peersByID.Load(*peer.ID)
137 addrPrev = addrPrevI.(string)
138 peerPrevI, exists = peers.Load(addrPrev)
140 peerPrev = peerPrevI.(*PeerState)
141 exists = peerPrev == nil
145 peerPrev.terminator <- struct{}{}
149 terminator: make(chan struct{}),
151 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
152 govpn.PeerTapProcessor(peer, tap, terminator)
155 }(psNew.peer, psNew.tap, psNew.terminator)
156 peers.Delete(addrPrev)
157 peers.Store(addr, psNew)
158 knownPeers.Delete(addrPrev)
159 knownPeers.Store(addr, &peer)
160 peersByID.Store(*peer.ID, addr)
162 `[rehandshake-completed bind="%s" peer="%s"]`,
163 *bindAddr, peer.ID.String(),
166 go func(addr string, peer *govpn.Peer) {
167 ifaceName, err := callUp(peer.ID, peer.Addr)
171 tap, err := govpn.TAPListen(ifaceName, peer.MTU)
174 `[tap-failed bind="%s" peer="%s" err="%s"]`,
175 *bindAddr, peer.ID.String(), err,
182 terminator: make(chan struct{}),
184 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
185 govpn.PeerTapProcessor(peer, tap, terminator)
188 }(psNew.peer, psNew.tap, psNew.terminator)
189 peers.Store(addr, psNew)
190 knownPeers.Store(addr, &peer)
191 peersByID.Store(*peer.ID, addr)
193 `[peer-created bind="%s" peer="%s"]`,