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client_map.go
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client_map.go
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/*
* Copyright (C) 2018 The "MysteriumNetwork/node" Authors.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package session
import (
"errors"
"sync"
"github.com/mysteriumnetwork/node/session"
)
// SessionMap defines map of current sessions
type SessionMap interface {
Add(session.Session)
Find(session.ID) (session.Session, bool)
Remove(session.ID)
}
// clientMap extends current sessions with client id metadata from Openvpn
type clientMap struct {
sessions SessionMap
sessionClientIDs map[session.ID]int
sessionMapLock sync.Mutex
}
// FindClientSession returns OpenVPN session instance by given session id
func (cm *clientMap) FindClientSession(clientID int, id session.ID) (session.Session, bool, error) {
sessionInstance, sessionExist := cm.sessions.Find(id)
if !sessionExist {
return session.Session{}, false, errors.New("no underlying session exists, possible break-in attempt")
}
sessionClientID, clientIDExist := cm.sessionClientIDs[id]
if clientIDExist && clientID != sessionClientID {
return sessionInstance, false, errors.New("provided clientID does not mach active clientID")
}
return sessionInstance, clientIDExist, nil
}
// UpdateClientSession updates OpenVPN session with clientID, returns false on clientID conflict
func (cm *clientMap) UpdateClientSession(clientID int, id session.ID) bool {
cm.sessionMapLock.Lock()
defer cm.sessionMapLock.Unlock()
_, clientIDExist := cm.sessionClientIDs[id]
if !clientIDExist {
cm.sessionClientIDs[id] = clientID
}
return cm.sessionClientIDs[id] == clientID
}
// RemoveSession removes given session from underlying session managers
func (cm *clientMap) RemoveSession(id session.ID) error {
cm.sessionMapLock.Lock()
defer cm.sessionMapLock.Unlock()
_, clientIDExist := cm.sessions.Find(id)
if !clientIDExist {
return errors.New("no underlying session exists: " + string(id))
}
cm.sessions.Remove(id)
delete(cm.sessionClientIDs, id)
return nil
}