163 lines
3.2 KiB
Go
163 lines
3.2 KiB
Go
// +build linux
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package syslog
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import (
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"errors"
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"fmt"
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"log/syslog"
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"net"
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"net/url"
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"os"
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"path"
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"strconv"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/docker/docker/daemon/logger"
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"github.com/docker/docker/pkg/urlutil"
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)
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const name = "syslog"
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var facilities = map[string]syslog.Priority{
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"kern": syslog.LOG_KERN,
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"user": syslog.LOG_USER,
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"mail": syslog.LOG_MAIL,
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"daemon": syslog.LOG_DAEMON,
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"auth": syslog.LOG_AUTH,
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"syslog": syslog.LOG_SYSLOG,
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"lpr": syslog.LOG_LPR,
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"news": syslog.LOG_NEWS,
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"uucp": syslog.LOG_UUCP,
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"cron": syslog.LOG_CRON,
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"authpriv": syslog.LOG_AUTHPRIV,
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"ftp": syslog.LOG_FTP,
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"local0": syslog.LOG_LOCAL0,
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"local1": syslog.LOG_LOCAL1,
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"local2": syslog.LOG_LOCAL2,
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"local3": syslog.LOG_LOCAL3,
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"local4": syslog.LOG_LOCAL4,
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"local5": syslog.LOG_LOCAL5,
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"local6": syslog.LOG_LOCAL6,
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"local7": syslog.LOG_LOCAL7,
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}
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type Syslog struct {
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writer *syslog.Writer
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}
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func init() {
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if err := logger.RegisterLogDriver(name, New); err != nil {
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logrus.Fatal(err)
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}
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if err := logger.RegisterLogOptValidator(name, ValidateLogOpt); err != nil {
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logrus.Fatal(err)
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}
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}
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func New(ctx logger.Context) (logger.Logger, error) {
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tag := ctx.Config["syslog-tag"]
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if tag == "" {
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tag = ctx.ContainerID[:12]
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}
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proto, address, err := parseAddress(ctx.Config["syslog-address"])
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if err != nil {
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return nil, err
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}
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facility, err := parseFacility(ctx.Config["syslog-facility"])
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if err != nil {
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return nil, err
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}
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log, err := syslog.Dial(
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proto,
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address,
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facility,
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path.Base(os.Args[0])+"/"+tag,
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)
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if err != nil {
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return nil, err
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}
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return &Syslog{
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writer: log,
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}, nil
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}
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func (s *Syslog) Log(msg *logger.Message) error {
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if msg.Source == "stderr" {
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return s.writer.Err(string(msg.Line))
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}
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return s.writer.Info(string(msg.Line))
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}
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func (s *Syslog) Close() error {
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return s.writer.Close()
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}
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func (s *Syslog) Name() string {
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return name
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}
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func parseAddress(address string) (string, string, error) {
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if urlutil.IsTransportURL(address) {
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url, err := url.Parse(address)
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if err != nil {
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return "", "", err
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}
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// unix socket validation
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if url.Scheme == "unix" {
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if _, err := os.Stat(url.Path); err != nil {
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return "", "", err
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}
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return url.Scheme, url.Path, nil
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}
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// here we process tcp|udp
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host := url.Host
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if _, _, err := net.SplitHostPort(host); err != nil {
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if !strings.Contains(err.Error(), "missing port in address") {
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return "", "", err
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}
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host = host + ":514"
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}
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return url.Scheme, host, nil
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}
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return "", "", nil
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}
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func ValidateLogOpt(cfg map[string]string) error {
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for key := range cfg {
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switch key {
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case "syslog-address":
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case "syslog-tag":
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case "syslog-facility":
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default:
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return fmt.Errorf("unknown log opt '%s' for syslog log driver", key)
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}
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}
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return nil
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}
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func parseFacility(facility string) (syslog.Priority, error) {
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if facility == "" {
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return syslog.LOG_DAEMON, nil
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}
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if syslogFacility, valid := facilities[facility]; valid {
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return syslogFacility, nil
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}
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fInt, err := strconv.Atoi(facility)
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if err == nil && 0 <= fInt && fInt <= 23 {
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return syslog.Priority(fInt << 3), nil
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}
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return syslog.Priority(0), errors.New("invalid syslog facility")
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}
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