// successCEA sends a success answer indicating that the CER was successfuly
// parsed and accepted by the server.
func successCEA(sm *StateMachine, c diam.Conn, m *diam.Message, cer *smparser.CER) error {
hostIP, _, err := net.SplitHostPort(c.LocalAddr().String())
if err != nil {
return fmt.Errorf("failed to parse own ip %q: %s", c.LocalAddr(), err)
}
a := m.Answer(diam.Success)
a.NewAVP(avp.OriginHost, avp.Mbit, 0, sm.cfg.OriginHost)
a.NewAVP(avp.OriginRealm, avp.Mbit, 0, sm.cfg.OriginRealm)
a.NewAVP(avp.HostIPAddress, avp.Mbit, 0, datatype.Address(net.ParseIP(hostIP)))
a.NewAVP(avp.VendorID, avp.Mbit, 0, sm.cfg.VendorID)
a.NewAVP(avp.ProductName, 0, 0, sm.cfg.ProductName)
if cer.OriginStateID != nil {
a.AddAVP(cer.OriginStateID)
}
if cer.AcctApplicationID != nil {
for _, acct := range cer.AcctApplicationID {
a.AddAVP(acct)
}
}
if cer.AuthApplicationID != nil {
for _, auth := range cer.AuthApplicationID {
a.AddAVP(auth)
}
}
if cer.VendorSpecificApplicationID != nil {
for _, vs := range cer.VendorSpecificApplicationID {
a.AddAVP(vs)
}
}
if sm.cfg.FirmwareRevision != 0 {
a.NewAVP(avp.FirmwareRevision, avp.Mbit, 0, sm.cfg.FirmwareRevision)
}
_, err = a.WriteTo(c)
return err
}
// errorCEA sends an error answer indicating that the CER failed due to
// an unsupported (acct/auth) application, and includes the AVP that
// caused the failure in the message.
func errorCEA(sm *StateMachine, c diam.Conn, m *diam.Message, cer *smparser.CER, failedAVP *diam.AVP) error {
hostIP, _, err := net.SplitHostPort(c.LocalAddr().String())
if err != nil {
return fmt.Errorf("failed to parse own ip %q: %s", c.LocalAddr(), err)
}
var a *diam.Message
if failedAVP == cer.InbandSecurityID {
a = m.Answer(diam.NoCommonSecurity)
} else {
a = m.Answer(diam.NoCommonApplication)
}
a.Header.CommandFlags |= diam.ErrorFlag
a.NewAVP(avp.OriginHost, avp.Mbit, 0, sm.cfg.OriginHost)
a.NewAVP(avp.OriginRealm, avp.Mbit, 0, sm.cfg.OriginRealm)
a.NewAVP(avp.HostIPAddress, avp.Mbit, 0, datatype.Address(net.ParseIP(hostIP)))
a.NewAVP(avp.VendorID, avp.Mbit, 0, sm.cfg.VendorID)
a.NewAVP(avp.ProductName, 0, 0, sm.cfg.ProductName)
if cer.OriginStateID != nil {
a.AddAVP(cer.OriginStateID)
}
a.NewAVP(avp.FailedAVP, avp.Mbit, 0, &diam.GroupedAVP{
AVP: []*diam.AVP{failedAVP},
})
if sm.cfg.FirmwareRevision != 0 {
a.NewAVP(avp.FirmwareRevision, avp.Mbit, 0, sm.cfg.FirmwareRevision)
}
_, err = a.WriteTo(c)
return err
}
func (cli *Client) handshake(c diam.Conn) (diam.Conn, error) {
ip, _, err := net.SplitHostPort(c.LocalAddr().String())
if err != nil {
return nil, err
}
m := cli.makeCER(net.ParseIP(ip))
// Ignore CER, but not DWR.
cli.Handler.mux.HandleFunc("CER", func(c diam.Conn, m *diam.Message) {})
// Handle CEA and DWA.
errc := make(chan error)
dwac := make(chan struct{})
cli.Handler.mux.Handle("CEA", handleCEA(cli.Handler, errc))
cli.Handler.mux.Handle("DWA", handshakeOK(handleDWA(cli.Handler, dwac)))
for i := 0; i < (int(cli.MaxRetransmits) + 1); i++ {
_, err := m.WriteTo(c)
if err != nil {
return nil, err
}
select {
case err := <-errc: // Wait for CEA.
if err != nil {
close(errc)
return nil, err
}
if cli.EnableWatchdog {
go cli.watchdog(c, dwac)
}
return c, nil
case <-time.After(cli.RetransmitInterval):
}
}
c.Close()
return nil, ErrHandshakeTimeout
}