2 GoVPN -- simple secure free software virtual private network daemon
3 Copyright (C) 2014-2016 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
67 conn.SetReadDeadline(time.Now().Add(time.Duration(govpn.TimeoutDefault) * time.Second))
68 n, err = conn.Read(buf[prev:])
70 // Either EOFed or timeouted
74 peerId := idsCache.Find(buf[:prev])
82 `[conf-get-failed bind="%s" peer="%s"]`,
83 *bindAddr, peerId.String(),
87 hs = govpn.NewHandshake(addr, conn, conf)
89 peer = hs.Server(buf[:prev])
96 `[handshake-completed bind="%s" addr="%s" peer="%s"]`,
97 *bindAddr, addr, peerId.String(),
100 addrPrev, exists := peersById[*peer.Id]
101 peersByIdLock.RUnlock()
104 peers[addrPrev].terminator <- struct{}{}
105 tap = peers[addrPrev].tap
109 terminator: make(chan struct{}),
111 go govpn.PeerTapProcessor(ps.peer, ps.tap, ps.terminator)
114 delete(peers, addrPrev)
115 delete(knownPeers, addrPrev)
117 knownPeers[addr] = &peer
118 peersById[*peer.Id] = addr
120 peersByIdLock.Unlock()
123 `[rehandshake-completed bind="%s" peer="%s"]`,
124 *bindAddr, peerId.String(),
127 ifaceName, err := callUp(peer.Id, peer.Addr)
132 tap, err = govpn.TAPListen(ifaceName, peer.MTU)
135 `[tap-failed bind="%s" peer="%s" err="%s"]`,
136 *bindAddr, peerId.String(), err,
144 terminator: make(chan struct{}, 1),
146 go govpn.PeerTapProcessor(ps.peer, ps.tap, ps.terminator)
151 peersById[*peer.Id] = addr
152 knownPeers[addr] = &peer
154 peersByIdLock.Unlock()
156 govpn.Printf(`[peer-created bind="%s" peer="%s"]`, *bindAddr, peerId.String())
167 nonceExpectation := make([]byte, govpn.NonceSize)
168 peer.NonceExpectation(nonceExpectation)
172 if prev == len(buf) {
175 conn.SetReadDeadline(time.Now().Add(conf.Timeout))
176 n, err = conn.Read(buf[prev:])
178 // Either EOFed or timeouted
183 if prev < govpn.MinPktLength {
186 i = bytes.Index(buf[:prev], nonceExpectation)
190 if !peer.PktProcess(buf[:i+govpn.NonceSize], tap, false) {
192 `[packet-unauthenticated bind="%s" addr="%s" peer="%s"]`,
193 *bindAddr, addr, peer.Id.String(),
197 peer.NonceExpectation(nonceExpectation)
198 copy(buf, buf[i+govpn.NonceSize:prev])
199 prev = prev - i - govpn.NonceSize