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moby--moby/daemon/logger/syslog/syslog.go
Dennis Docter 609e7b0a55 Add --log-opt to specify facility for syslog driver
Signed-off-by: Dennis Docter <dennis@d23.nl>
2015-06-23 14:04:25 +02:00

151 lines
2.9 KiB
Go

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