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/>.
27 "cypherpunks.ru/govpn"
31 bind, err := net.ResolveTCPAddr("tcp", *bindAddr)
33 log.Fatalln("Can not resolve bind address:", err)
35 listener, err := net.ListenTCP("tcp", bind)
37 log.Fatalln("Can not listen on TCP:", err)
39 govpn.BothPrintf(`[tcp-listen bind="%s"]`, *bindAddr)
42 conn, err := listener.AcceptTCP()
44 govpn.Printf(`[tcp-accept-failed bind="%s" err="%s"]`, *bindAddr, err)
52 func handleTCP(conn net.Conn) {
53 addr := conn.RemoteAddr().String()
54 buf := make([]byte, govpn.EnclessEnlargeSize+2*govpn.MTUMax)
58 var hs *govpn.Handshake
62 var conf *govpn.PeerConf
64 var peerPrevI interface{}
65 var peerPrev *PeerState
70 conn.SetReadDeadline(time.Now().Add(time.Duration(govpn.TimeoutDefault) * time.Second))
71 n, err = conn.Read(buf[prev:])
73 // Either EOFed or timeouted
77 peerID := idsCache.Find(buf[:prev])
85 `[conf-get-failed bind="%s" peer="%s"]`,
86 *bindAddr, peerID.String(),
90 hs = govpn.NewHandshake(addr, conn, conf)
92 peer = hs.Server(buf[:prev])
99 `[handshake-completed bind="%s" addr="%s" peer="%s"]`,
100 *bindAddr, addr, peerID.String(),
102 addrPrevI, exists := peersByID.Load(*peer.ID)
104 addrPrev = addrPrevI.(string)
105 peerPrevI, exists = peers.Load(addrPrev)
107 peerPrev = peerPrevI.(*PeerState)
108 exists = peerPrev == nil
112 peerPrev.terminator <- struct{}{}
117 terminator: make(chan struct{}),
119 go govpn.PeerTapProcessor(ps.peer, ps.tap, ps.terminator)
120 peers.Delete(addrPrev)
121 peers.Store(addr, ps)
122 knownPeers.Delete(addrPrev)
123 knownPeers.Store(addr, &peer)
124 peersByID.Store(*peer.ID, addr)
126 `[rehandshake-completed bind="%s" peer="%s"]`,
127 *bindAddr, peerID.String(),
130 ifaceName, err := callUp(peer.ID, peer.Addr)
135 tap, err = govpn.TAPListen(ifaceName, peer.MTU)
138 `[tap-failed bind="%s" peer="%s" err="%s"]`,
139 *bindAddr, peerID.String(), err,
147 terminator: make(chan struct{}, 1),
149 go govpn.PeerTapProcessor(ps.peer, ps.tap, ps.terminator)
150 peers.Store(addr, ps)
151 peersByID.Store(*peer.ID, addr)
152 knownPeers.Store(addr, &peer)
153 govpn.Printf(`[peer-created bind="%s" peer="%s"]`, *bindAddr, peerID.String())
167 if prev == len(buf) {
170 conn.SetReadDeadline(time.Now().Add(conf.Timeout))
171 n, err = conn.Read(buf[prev:])
173 // Either EOFed or timeouted
178 if prev < govpn.MinPktLength {
181 i = bytes.Index(buf[:prev], peer.NonceExpect)
185 if !peer.PktProcess(buf[:i+govpn.NonceSize], tap, false) {
187 `[packet-unauthenticated bind="%s" addr="%s" peer="%s"]`,
188 *bindAddr, addr, peer.ID.String(),
192 copy(buf, buf[i+govpn.NonceSize:prev])
193 prev = prev - i - govpn.NonceSize