-
Notifications
You must be signed in to change notification settings - Fork 17
/
main.go
213 lines (192 loc) · 5.17 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
/*************************************************************************
* Copyright 2023 Gravwell, Inc. All rights reserved.
* Contact: <legal@gravwell.io>
*
* This software may be modified and distributed under the terms of the
* BSD 2-clause license. See the LICENSE file for details.
**************************************************************************/
package main
import (
"errors"
"flag"
"fmt"
"os"
"os/signal"
dbg "runtime/debug"
"time"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/debug"
"golang.org/x/sys/windows/svc/eventlog"
"github.com/google/uuid"
"github.com/gravwell/gravwell/v3/ingest"
"github.com/gravwell/gravwell/v3/ingest/config/validate"
"github.com/gravwell/gravwell/v3/ingest/log"
"github.com/gravwell/gravwell/v3/ingesters/version"
"github.com/gravwell/gravwell/v3/winevent"
)
const (
serviceName = `GravwellEvents`
appName = `winevent`
ingesterName = `Windows Events`
defaultConfigPath = `gravwell\eventlog\config.cfg`
)
var (
configOverride = flag.String("config-file-override", "", "Override location for configuration file")
verboseF = flag.Bool("v", false, "Verbose mode, do not run as a service and output status to stdout")
ver = flag.Bool("version", false, "Print the version information and exit")
confLoc string
debugOn bool
lg *log.Logger
)
func init() {
flag.Parse()
if *ver {
version.PrintVersion(os.Stdout)
ingest.PrintVersion(os.Stdout)
os.Exit(0)
}
if *configOverride == "" {
var err error
confLoc, err = winevent.ProgramDataFilename(defaultConfigPath)
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get config file path: %v\n", err)
os.Exit(-1)
}
} else {
confLoc = *configOverride
}
debugOn = *verboseF
validate.ValidateIngesterConfig(GetConfig, confLoc, ``)
}
func main() {
dbg.SetTraceback("all")
inter, err := svc.IsAnInteractiveSession()
if err != nil {
fmt.Fprintf(os.Stderr, "Failed to get interactive session status: %v\n", err)
return
}
if inter {
lg = log.New(os.Stdout)
} else {
e, err := eventlog.Open(serviceName)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to get event log handle: %v\n", err)
return
}
lg = log.NewLevelRelay(levelLogger{elog: e})
}
lg.SetAppname(appName)
cfg, err := GetConfig(confLoc)
if err != nil {
lg.Error("failed to get configuration", log.KVErr(err))
return
}
//check if we have a UUID, if not try to write one back
if id, ok := cfg.Global.IngestConfig.IngesterUUID(); !ok {
id = uuid.New()
if err := cfg.Global.IngestConfig.SetIngesterUUID(id, confLoc); err != nil {
lg.Error("failed to set ingester UUID at startup", log.KVErr(err))
return
}
}
if len(cfg.Global.Log_Level) > 0 {
if err = lg.SetLevelString(cfg.Global.Log_Level); err != nil {
lg.FatalCode(0, "invalid Log Level", log.KV("loglevel", cfg.Global.Log_Level), log.KVErr(err))
}
}
lg.Info("service started", log.KV("name", serviceName))
s, err := NewService(cfg)
if err != nil {
lg.Error("failed to create gravwell service", log.KVErr(err))
return
}
if inter {
runInteractive(s)
} else {
runService(s)
}
if err := s.Close(); err != nil {
lg.Error("failed to create gravwell service", log.KVErr(err))
}
}
func runInteractive(s *mainService) {
//fire off the event consumers
closer := make(chan svc.ChangeRequest, 1)
defer close(closer)
status := make(chan svc.Status, 1)
defer close(status)
sigChan := make(chan os.Signal, 1)
defer close(sigChan)
signal.Notify(sigChan, os.Interrupt, os.Kill)
go s.Execute(nil, closer, status)
loop:
for {
select {
case <-sigChan:
debugout("Caught close signal\n")
if err := serviceWriteTimeout(closer, svc.ChangeRequest{Cmd: svc.Shutdown}, time.Second); err != nil {
lg.Error("failed to send shutdown command", log.KVErr(err))
}
case st := <-status:
switch st.State {
case svc.StopPending:
lg.Debug("service is stopping")
case svc.Stopped:
lg.Debug("service stopped")
break loop
case svc.StartPending:
lg.Debug("service is starting")
case svc.Running:
lg.Debug("service is running")
default:
lg.Error("got unknown status update", log.KV("state", st.State))
}
}
}
}
func runService(s *mainService) {
if err := svc.Run(serviceName, s); err != nil {
lg.Error("failed to run service", log.KVErr(err))
return
}
lg.Info("service stopped")
}
func serviceWriteTimeout(ch chan svc.ChangeRequest, r svc.ChangeRequest, to time.Duration) (err error) {
select {
case ch <- r:
case <-time.After(to):
err = errors.New("Timeout")
}
return
}
func debugout(format string, args ...interface{}) {
if debugOn {
fmt.Printf(format, args...)
}
}
type levelLogger struct {
elog debug.Log
}
// levelLogger implements the log.LevelRelay interface
func (l levelLogger) WriteLog(lvl log.Level, ts time.Time, msg, rawMsg string) error {
switch lvl {
case log.DEBUG:
if debugOn {
fmt.Fprintln(os.Stdout, rawMsg)
}
case log.INFO:
return l.elog.Info(1, rawMsg)
case log.WARN:
return l.elog.Warning(1, rawMsg)
case log.ERROR:
fallthrough
case log.CRITICAL:
fallthrough
case log.FATAL:
return l.elog.Error(1, rawMsg)
}
return nil
}
func (l levelLogger) Close() error {
return l.elog.Close()
}