Update vendor (#1265)

vendor/github.com/wiggin77/srslog/srslog.go

@@ -0,0 +1,125 @@
+package srslog
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"io/ioutil"
+	"log"
+	"net"
+	"os"
+)
+
+// This interface allows us to work with both local and network connections,
+// and enables Solaris support (see syslog_unix.go).
+type serverConn interface {
+	writeString(framer Framer, formatter Formatter, p Priority, hostname, tag, s string) error
+	close() error
+}
+
+// DialFunc is the function signature to be used for a custom dialer callback
+// with DialWithCustomDialer
+type DialFunc func(string, string) (net.Conn, error)
+
+// New establishes a new connection to the system log daemon.  Each
+// write to the returned Writer sends a log message with the given
+// priority and prefix.
+func New(priority Priority, tag string) (w *Writer, err error) {
+	return Dial("", "", priority, tag)
+}
+
+// Dial establishes a connection to a log daemon by connecting to
+// address raddr on the specified network.  Each write to the returned
+// Writer sends a log message with the given facility, severity and
+// tag.
+// If network is empty, Dial will connect to the local syslog server.
+func Dial(network, raddr string, priority Priority, tag string) (*Writer, error) {
+	return DialWithTLSConfig(network, raddr, priority, tag, nil)
+}
+
+// ErrNilDialFunc is returned from DialWithCustomDialer when a nil DialFunc is passed,
+// avoiding a nil pointer deference panic.
+var ErrNilDialFunc = errors.New("srslog: nil DialFunc passed to DialWithCustomDialer")
+
+// DialWithCustomDialer establishes a connection by calling customDial.
+// Each write to the returned Writer sends a log message with the given facility, severity and tag.
+// Network must be "custom" in order for this package to use customDial.
+// While network and raddr will be passed to customDial, it is allowed for customDial to ignore them.
+// If customDial is nil, this function returns ErrNilDialFunc.
+func DialWithCustomDialer(network, raddr string, priority Priority, tag string, customDial DialFunc) (*Writer, error) {
+	if customDial == nil {
+		return nil, ErrNilDialFunc
+	}
+	return dialAllParameters(network, raddr, priority, tag, nil, customDial)
+}
+
+// DialWithTLSCertPath establishes a secure connection to a log daemon by connecting to
+// address raddr on the specified network. It uses certPath to load TLS certificates and configure
+// the secure connection.
+func DialWithTLSCertPath(network, raddr string, priority Priority, tag, certPath string) (*Writer, error) {
+	serverCert, err := ioutil.ReadFile(certPath)
+	if err != nil {
+		return nil, err
+	}
+
+	return DialWithTLSCert(network, raddr, priority, tag, serverCert)
+}
+
+// DialWIthTLSCert establishes a secure connection to a log daemon by connecting to
+// address raddr on the specified network. It uses serverCert to load a TLS certificate
+// and configure the secure connection.
+func DialWithTLSCert(network, raddr string, priority Priority, tag string, serverCert []byte) (*Writer, error) {
+	pool := x509.NewCertPool()
+	pool.AppendCertsFromPEM(serverCert)
+	config := tls.Config{
+		RootCAs: pool,
+	}
+
+	return DialWithTLSConfig(network, raddr, priority, tag, &config)
+}
+
+// DialWithTLSConfig establishes a secure connection to a log daemon by connecting to
+// address raddr on the specified network. It uses tlsConfig to configure the secure connection.
+func DialWithTLSConfig(network, raddr string, priority Priority, tag string, tlsConfig *tls.Config) (*Writer, error) {
+	return dialAllParameters(network, raddr, priority, tag, tlsConfig, nil)
+}
+
+// implementation of the various functions above
+func dialAllParameters(network, raddr string, priority Priority, tag string, tlsConfig *tls.Config, customDial DialFunc) (*Writer, error) {
+	if err := validatePriority(priority); err != nil {
+		return nil, err
+	}
+
+	if tag == "" {
+		tag = os.Args[0]
+	}
+	hostname, _ := os.Hostname()
+
+	w := &Writer{
+		priority:   priority,
+		tag:        tag,
+		hostname:   hostname,
+		network:    network,
+		raddr:      raddr,
+		tlsConfig:  tlsConfig,
+		customDial: customDial,
+	}
+
+	_, err := w.connect()
+	if err != nil {
+		return nil, err
+	}
+	return w, err
+}
+
+// NewLogger creates a log.Logger whose output is written to
+// the system log service with the specified priority. The logFlag
+// argument is the flag set passed through to log.New to create
+// the Logger.
+func NewLogger(p Priority, logFlag int) (*log.Logger, error) {
+	s, err := New(p, "")
+	if err != nil {
+		return nil, err
+	}
+	return log.New(s, "", logFlag), nil
+}