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100 lines
3 KiB
Go
100 lines
3 KiB
Go
package srslog
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import (
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"crypto/tls"
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"crypto/x509"
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"io/ioutil"
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"log"
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"os"
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)
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// This interface allows us to work with both local and network connections,
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// and enables Solaris support (see syslog_unix.go).
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type serverConn interface {
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writeString(framer Framer, formatter Formatter, p Priority, hostname, tag, s string) error
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close() error
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}
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// New establishes a new connection to the system log daemon. Each
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// write to the returned Writer sends a log message with the given
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// priority and prefix.
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func New(priority Priority, tag string) (w *Writer, err error) {
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return Dial("", "", priority, tag)
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}
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// Dial establishes a connection to a log daemon by connecting to
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// address raddr on the specified network. Each write to the returned
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// Writer sends a log message with the given facility, severity and
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// tag.
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// If network is empty, Dial will connect to the local syslog server.
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func Dial(network, raddr string, priority Priority, tag string) (*Writer, error) {
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return DialWithTLSConfig(network, raddr, priority, tag, nil)
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}
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// DialWithTLSCertPath establishes a secure connection to a log daemon by connecting to
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// address raddr on the specified network. It uses certPath to load TLS certificates and configure
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// the secure connection.
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func DialWithTLSCertPath(network, raddr string, priority Priority, tag, certPath string) (*Writer, error) {
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serverCert, err := ioutil.ReadFile(certPath)
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if err != nil {
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return nil, err
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}
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return DialWithTLSCert(network, raddr, priority, tag, serverCert)
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}
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// DialWIthTLSCert establishes a secure connection to a log daemon by connecting to
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// address raddr on the specified network. It uses serverCert to load a TLS certificate
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// and configure the secure connection.
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func DialWithTLSCert(network, raddr string, priority Priority, tag string, serverCert []byte) (*Writer, error) {
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pool := x509.NewCertPool()
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pool.AppendCertsFromPEM(serverCert)
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config := tls.Config{
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RootCAs: pool,
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}
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return DialWithTLSConfig(network, raddr, priority, tag, &config)
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}
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// DialWithTLSConfig establishes a secure connection to a log daemon by connecting to
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// address raddr on the specified network. It uses tlsConfig to configure the secure connection.
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func DialWithTLSConfig(network, raddr string, priority Priority, tag string, tlsConfig *tls.Config) (*Writer, error) {
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if err := validatePriority(priority); err != nil {
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return nil, err
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}
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if tag == "" {
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tag = os.Args[0]
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}
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hostname, _ := os.Hostname()
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w := &Writer{
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priority: priority,
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tag: tag,
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hostname: hostname,
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network: network,
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raddr: raddr,
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tlsConfig: tlsConfig,
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}
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w.Lock()
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defer w.Unlock()
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err := w.connect()
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if err != nil {
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return nil, err
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}
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return w, err
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}
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// NewLogger creates a log.Logger whose output is written to
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// the system log service with the specified priority. The logFlag
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// argument is the flag set passed through to log.New to create
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// the Logger.
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func NewLogger(p Priority, logFlag int) (*log.Logger, error) {
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s, err := New(p, "")
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if err != nil {
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return nil, err
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}
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return log.New(s, "", logFlag), nil
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}
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