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
61 var hs *govpn.Handshake
64 var peerID *govpn.PeerID
65 var conf *govpn.PeerConf
68 n, raddr, err = conn.ReadFromUDP(buf)
70 govpn.Printf(`[receive-failed bind="%s" err="%s"]`, *bindAddr, err)
76 ps, exists = peers[addr]
79 go func(peer *govpn.Peer, tap *govpn.TAP, buf []byte, n int) {
80 peer.PktProcess(buf[:n], tap, true)
82 }(ps.peer, ps.tap, buf, n)
87 hs, exists = handshakes[addr]
90 peerID = idsCache.Find(buf[:n])
92 govpn.Printf(`[identity-unknown bind="%s" addr="%s"]`, *bindAddr, addr)
99 `[conf-get-failed bind="%s" peer="%s"]`,
100 *bindAddr, peerID.String(),
105 hs := govpn.NewHandshake(
107 UDPSender{conn: conn, addr: raddr},
113 handshakes[addr] = hs
118 peer := hs.Server(buf[:n])
124 `[handshake-completed bind="%s" addr="%s" peer="%s"]`,
125 *bindAddr, addr, peerID.String(),
129 delete(handshakes, addr)
133 udpBufs <- make([]byte, govpn.MTUMax)
134 udpBufs <- make([]byte, govpn.MTUMax)
136 peersByIDLock.RLock()
137 addrPrev, exists = peersByID[*peer.ID]
138 peersByIDLock.RUnlock()
141 peers[addrPrev].terminator <- struct{}{}
144 tap: peers[addrPrev].tap,
145 terminator: make(chan struct{}),
147 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
148 govpn.PeerTapProcessor(peer, tap, terminator)
151 }(psNew.peer, psNew.tap, psNew.terminator)
154 delete(peers, addrPrev)
155 delete(knownPeers, addrPrev)
157 knownPeers[addr] = &peer
158 peersByID[*peer.ID] = addr
160 peersByIDLock.Unlock()
163 `[rehandshake-completed bind="%s" peer="%s"]`,
164 *bindAddr, peer.ID.String(),
167 go func(addr string, peer *govpn.Peer) {
168 ifaceName, err := callUp(peer.ID, peer.Addr)
172 tap, err := govpn.TAPListen(ifaceName, peer.MTU)
175 `[tap-failed bind="%s" peer="%s" err="%s"]`,
176 *bindAddr, peer.ID.String(), err,
183 terminator: make(chan struct{}),
185 go func(peer *govpn.Peer, tap *govpn.TAP, terminator chan struct{}) {
186 govpn.PeerTapProcessor(peer, tap, terminator)
189 }(psNew.peer, psNew.tap, psNew.terminator)
194 knownPeers[addr] = &peer
195 peersByID[*peer.ID] = addr
197 peersByIDLock.Unlock()
199 govpn.Printf(`[peer-created bind="%s" peer="%s"]`, *bindAddr, peer.ID.String())