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tvpn.go
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tvpn.go
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/*
* TVPN: A Peer-to-Peer VPN solution for traversing NAT firewalls
* Copyright (C) 2013 Joshua Chase <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package tvpn
import (
"github.com/Pursuit92/LeveledLogger/log"
"github.com/Pursuit92/state"
"math/rand"
"time"
)
type Friend struct {
Validate bool
Routes map[string]string
}
type TVPN struct {
Friends map[string]Friend
Sig SigBackend
Stun StunBackend
VPN VPNBackend
States map[string]*ConState
Alloc *IPManager
}
var rgen *rand.Rand
func init() {
rgen = rand.New(rand.NewSource(time.Now().UnixNano()))
}
func SetLogLevel(n int) {
log.Out.SetLevel(n)
}
func SetLogPrefix(s string) {
for i := 0; i < 10; i++ {
log.Out.SetPrefix(i,s)
}
}
func New(sig SigBackend, stun StunBackend, vpn VPNBackend, alloc *IPManager) *TVPN {
tvpnInstance := TVPN{
Sig: sig,
Stun: stun,
VPN: vpn,
Alloc: alloc,
States: make(map[string]*ConState),
}
return &tvpnInstance
}
func (t *TVPN) Configure(conf Config) {
t.Friends = conf.Friends
t.Sig.Configure(conf.Sig)
t.Stun.Configure(conf.Stun)
t.VPN.Configure(conf.VPN)
t.Alloc.Configure(conf.IPMan)
}
func (t TVPN) IsFriend(name string) (Friend,bool) {
f,ok := t.Friends[name]
return f,ok
}
func (t *TVPN) Run() error {
var msg Message
var err error
t.Alloc.Init()
err = t.Sig.Connect()
if err != nil {
log.Out.Lprintln(0,err)
return err
}
for msg, err = t.Sig.RecvMessage(); err == nil; msg, err = t.Sig.RecvMessage() {
switch msg.Type {
case Init:
log.Out.Lprintf(3,"Creating new state machine for %s\n",msg.From)
st := NewState(msg.From,false,t)
state.Input(st,msg)
t.States[msg.From] = st
case Join:
log.Out.Lprintf(3,"Received Join from %s!\n",msg.From)
_, ok := t.IsFriend(msg.From)
if ok {
st := NewState(msg.From,true,t)
t.States[msg.From] = st
}
log.Out.Lprintln(3,"Done with join!")
case Quit:
st,exists := t.States[msg.From]
if exists {
st.Cleanup()
delete(t.States,msg.From)
}
case Reset:
t.States[msg.From].Reset(msg.Data["reason"])
default:
st,exists := t.States[msg.From]
if exists {
state.Input(st,msg)
} else {
// do stuff here
}
}
}
return err
}
func (t *TVPN) Start() {
go t.Run()
}
func (t *TVPN) Stop() {
t.Sig.Disconnect()
t.Alloc.Stop()
t.Cleanup()
}
func (t *TVPN) Cleanup() {
for i,v := range t.States {
v.Cleanup()
delete(t.States, i)
}
}