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
|
// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Binary stenographer reads packets from the given filename based on a set of
// IPs and spits them out via STDOUT as pcap data, which should be able to be
// piped into tcpdump.
package main
import (
"flag"
"io"
"log"
"log/syslog"
"net/http"
"os"
"runtime"
"github.com/google/stenographer/base"
"github.com/google/stenographer/config"
"github.com/google/stenographer/env"
_ "net/http/pprof" // server debugging info in /debug/pprof/*
)
var (
configFilename = flag.String(
"config",
"/etc/stenographer/config",
"File location to read configuration from")
logToSyslog = flag.Bool(
"syslog", true, "If true, log to syslog. Otherwise, log to stderr")
// Verbose logging.
v = base.V
)
const (
snapLen = 65536 // Max packet size we return in pcap files to users.
)
func main() {
flag.Parse()
stenotypeOutput := io.Writer(os.Stderr)
// Set up syslog logging
if *logToSyslog {
logwriter, err := syslog.New(syslog.LOG_USER|syslog.LOG_INFO, "stenographer")
if err != nil {
log.Fatalf("could not set up syslog logging")
}
log.SetOutput(logwriter)
stenotypeOutput = logwriter // for stenotype
}
runtime.GOMAXPROCS(runtime.NumCPU() * 2)
runtime.SetBlockProfileRate(1000)
conf, err := config.ReadConfigFile(*configFilename)
if err != nil {
log.Fatal(err.Error())
}
v(1, "Using config:\n%+v", conf)
env, err := env.New(*conf)
if err != nil {
log.Fatalf("unable to set up stenographer environment: %v", err)
}
env.StenotypeOutput = stenotypeOutput
defer env.Close()
go env.RunStenotype()
env.ExportDebugHandlers(http.DefaultServeMux)
log.Fatal(env.Serve())
}
|
