func (nego *d5SNegotiation) handshakeSession(hConn *hashedConn, buf []byte) (session *Session, err error) {
defer func() {
if e, y := exception.ErrorOf(recover()); y {
err = e
}
}()
setSoTimeout(hConn)
var skey = nego.verifyThenDHExchange(hConn, buf[256:])
var cf = NewCipherFactory(nego.Algo, skey)
hConn.cipher = cf.NewCipher(nil)
session = NewSession(hConn.Conn, cf, nego)
setSoTimeout(hConn)
nego.respondTestWithToken(hConn, session)
return
}
func (nego *d5CNegotiation) negotiate(p *tunParams) (conn *Conn, err error) {
var con *net.TCPConn
defer func() {
if e, y := exception.ErrorOf(recover()); y {
SafeClose(con)
err = e
}
}()
con, err = net.DialTCP("tcp", nil, nego.d5sAddr)
ThrowIf(err != nil, D5SER_UNREACHABLE)
setSoTimeout(con)
var hConn = NewConnWithHash(con)
conn = hConn.Conn
nego.requestAuthAndDHExchange(hConn)
setSoTimeout(con)
p.cipherFactory = nego.finishDHExThenSetupCipher(hConn)
hConn.cipher = p.cipherFactory.NewCipher(nil)
setSoTimeout(con)
nego.validateAndGetTokens(hConn, p)
return
}
// must catch exceptions and return
func (t *Client) createDataTun() (c *Conn, err error) {
defer func() {
if e, y := ex.ErrorOf(recover()); y {
err = e
}
}()
conn, err := net.DialTimeout("tcp", t.nego.d5sAddr.String(), GENERAL_SO_TIMEOUT)
if err != nil {
return nil, err
}
buf := make([]byte, DMLEN2)
token := t.getToken()
copy(buf, token)
buf[TKSZ] = d5Sub(token[TKSZ-2])
buf[TKSZ+1] = d5Sub(token[TKSZ-1])
cipher := t.tp.cipherFactory.NewCipher(token)
_, err = conn.Write(buf)
ThrowErr(err)
c = NewConn(conn.(*net.TCPConn), cipher)
c.identifier = t.nego.RemoteName()
return c, nil
}