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|
package server
import (
"crypto/tls"
"errors"
"log"
"net"
"sync"
"go.rctt.net/solec/core"
)
type Server struct {
cfg Config
users map[string]User // TODO: Use full address instead of just name
servers map[string]RemoteServer
usersMu sync.RWMutex
serversMu sync.RWMutex
Storage Storage
}
type Config struct {
ListenAddr string
Name string
Tls bool
CertPem []byte
KeyPem []byte
}
func NewServer(cfg Config, storage Storage) *Server {
return &Server{
cfg: cfg,
Storage: storage,
users: make(map[string]User),
servers: make(map[string]RemoteServer),
}
}
func (s *Server) Start() error {
if s.cfg.Tls {
return s.listenTls()
}
return s.listenPlain()
}
func (s *Server) listenPlain() error {
ln, err := net.Listen("tcp", s.cfg.ListenAddr)
if err != nil {
return err
}
s.listen(ln)
return nil
}
func (s *Server) listenTls() error {
cert, err := tls.X509KeyPair(s.cfg.CertPem, s.cfg.KeyPem)
if err != nil {
return err
}
cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
ln, err := tls.Listen("tcp", s.cfg.ListenAddr, cfg)
if err != nil {
return err
}
s.listen(ln)
return nil
}
func (s *Server) listen(ln net.Listener) {
for {
conn, err := ln.Accept()
if err != nil {
log.Println("cannot listen:", err)
continue
}
log.Println("client connected:", conn.RemoteAddr())
go s.handleConn(conn)
}
}
func (s *Server) handleConn(conn net.Conn) {
defer conn.Close()
cType, err := s.performHandshake(conn)
if err != nil {
log.Println("handshake error:", err)
return
}
switch cType {
case core.ConnTypeUnknown:
log.Println("invalid connection type")
case core.ConnTypeUser:
s.handleUserConn(conn)
case core.ConnTypeServer:
s.handleServerConn(conn)
}
}
func (s *Server) performHandshake(conn net.Conn) (core.ConnType, error) {
serverHs := core.Handshake{0, 2, core.ConnTypeServer}
if err := core.Send(conn, serverHs); err != nil {
return core.ConnTypeUnknown, err
}
clientPayload, err := core.Decode(conn)
if err != nil {
return core.ConnTypeUnknown, err
}
clientHs, ok := clientPayload.(core.Handshake)
if !ok {
return core.ConnTypeUnknown, core.ErrUnexpectedPayloadType
}
if serverHs.Major != clientHs.Major {
return clientHs.ConnType, errors.New("server and client are using different protocol version")
}
return clientHs.ConnType, nil
}
|
