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scada.go
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scada.go
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package agent
import (
"crypto/tls"
"errors"
"fmt"
"io"
"net"
"os"
"strconv"
"sync"
"time"
"github.com/hashicorp/scada-client"
)
const (
// providerService is the service name we use
providerService = "consul"
// resourceType is the type of resource we represent
// when connecting to SCADA
resourceType = "infrastructures"
)
// ProviderService returns the service information for the provider
func ProviderService(c *Config) *client.ProviderService {
return &client.ProviderService{
Service: providerService,
ServiceVersion: fmt.Sprintf("%s%s", c.Version, c.VersionPrerelease),
Capabilities: map[string]int{
"http": 1,
},
Meta: map[string]string{
"auto-join": strconv.FormatBool(c.AtlasJoin),
"datacenter": c.Datacenter,
"server": strconv.FormatBool(c.Server),
},
ResourceType: resourceType,
}
}
// ProviderConfig returns the configuration for the SCADA provider
func ProviderConfig(c *Config) *client.ProviderConfig {
return &client.ProviderConfig{
Service: ProviderService(c),
Handlers: map[string]client.CapabilityProvider{
"http": nil,
},
ResourceGroup: c.AtlasInfrastructure,
Token: c.AtlasToken,
}
}
// NewProvider creates a new SCADA provider using the
// given configuration. Requests for the HTTP capability
// are passed off to the listener that is returned.
func NewProvider(c *Config, logOutput io.Writer) (*client.Provider, net.Listener, error) {
// Get the configuration of the provider
config := ProviderConfig(c)
config.LogOutput = logOutput
// SCADA_INSECURE env variable is used for testing to disable
// TLS certificate verification.
if os.Getenv("SCADA_INSECURE") != "" {
config.TLSConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
// Create an HTTP listener and handler
list := newScadaListener(c.AtlasInfrastructure)
config.Handlers["http"] = func(capability string, meta map[string]string,
conn io.ReadWriteCloser) error {
return list.PushRWC(conn)
}
// Create the provider
provider, err := client.NewProvider(config)
if err != nil {
list.Close()
return nil, nil, err
}
return provider, list, nil
}
// scadaListener is used to return a net.Listener for
// incoming SCADA connections
type scadaListener struct {
addr *scadaAddr
pending chan net.Conn
closed bool
closedCh chan struct{}
l sync.Mutex
}
// newScadaListener returns a new listener
func newScadaListener(infra string) *scadaListener {
l := &scadaListener{
addr: &scadaAddr{infra},
pending: make(chan net.Conn),
closedCh: make(chan struct{}),
}
return l
}
// PushRWC is used to push a io.ReadWriteCloser as a net.Conn
func (s *scadaListener) PushRWC(conn io.ReadWriteCloser) error {
// Check if this already implements net.Conn
if nc, ok := conn.(net.Conn); ok {
return s.Push(nc)
}
// Wrap to implement the interface
wrapped := &scadaRWC{conn, s.addr}
return s.Push(wrapped)
}
// Push is used to add a connection to the queu
func (s *scadaListener) Push(conn net.Conn) error {
select {
case s.pending <- conn:
return nil
case <-time.After(time.Second):
return fmt.Errorf("accept timed out")
case <-s.closedCh:
return fmt.Errorf("scada listener closed")
}
}
func (s *scadaListener) Accept() (net.Conn, error) {
select {
case conn := <-s.pending:
return conn, nil
case <-s.closedCh:
return nil, fmt.Errorf("scada listener closed")
}
}
func (s *scadaListener) Close() error {
s.l.Lock()
defer s.l.Unlock()
if s.closed {
return nil
}
s.closed = true
close(s.closedCh)
return nil
}
func (s *scadaListener) Addr() net.Addr {
return s.addr
}
// scadaAddr is used to return a net.Addr for SCADA
type scadaAddr struct {
infra string
}
func (s *scadaAddr) Network() string {
return "SCADA"
}
func (s *scadaAddr) String() string {
return fmt.Sprintf("SCADA::Atlas::%s", s.infra)
}
type scadaRWC struct {
io.ReadWriteCloser
addr *scadaAddr
}
func (s *scadaRWC) LocalAddr() net.Addr {
return s.addr
}
func (s *scadaRWC) RemoteAddr() net.Addr {
return s.addr
}
func (s *scadaRWC) SetDeadline(t time.Time) error {
return errors.New("SCADA.Conn does not support deadlines")
}
func (s *scadaRWC) SetReadDeadline(t time.Time) error {
return errors.New("SCADA.Conn does not support deadlines")
}
func (s *scadaRWC) SetWriteDeadline(t time.Time) error {
return errors.New("SCADA.Conn does not support deadlines")
}