/
tcping.go
155 lines (144 loc) · 4.14 KB
/
tcping.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
package cmd
import (
"context"
"errors"
"fmt"
"github.com/juzeon/lip/util"
"golang.org/x/net/proxy"
"io"
"log"
"os"
"strconv"
"strings"
"syscall"
"time"
"github.com/spf13/cobra"
)
var tcpingCmd = &cobra.Command{
Use: "tcping <1.1.1.1:443 or 1.1.1.1 443>",
Short: "TCPing an address with a port",
Args: cobra.MatchAll(cobra.MinimumNArgs(1), cobra.MaximumNArgs(2)),
Run: func(cmd *cobra.Command, args []string) {
var host string
var port int
if len(args) == 1 {
h, p, err := util.ExtractHostPort(args[0])
if err != nil {
log.Fatalln("malformed argument: " + err.Error())
}
host = h
port = p
} else {
host, _ = util.RemoveProtocol(args[0])
p, err := strconv.Atoi(args[1])
if err != nil {
log.Fatalln("malformed arguments: " + err.Error())
}
port = p
}
address := host + ":" + strconv.Itoa(port)
if tcpingFlags.Continuously {
for {
res := doTcpingOnce(address)
res.WriteOut(os.Stdout)
if tcpingFlags.ExitOnce && res.Num == tcpingOpen {
break
}
}
} else if tcpingFlags.Second == 0 {
for i := 1; i <= tcpingFlags.Count; i++ {
res := doTcpingOnce(address)
res.WriteOut(os.Stdout)
if tcpingFlags.ExitOnce && res.Num == tcpingOpen {
break
}
}
} else {
t := time.Now()
for {
res := doTcpingOnce(address)
res.WriteOut(os.Stdout)
if time.Since(t) > time.Duration(tcpingFlags.Second)*time.Second || tcpingFlags.ExitOnce {
break
}
}
}
},
}
type tcpingFlagStruct struct {
Continuously bool
Count int
Second int
Timeout int
ExitOnce bool
Wait float64
}
var tcpingFlags = tcpingFlagStruct{}
func init() {
rootCmd.AddCommand(tcpingCmd)
tcpingCmd.Flags().BoolVarP(&tcpingFlags.Continuously, "continuously", "t", false,
"ping continuously until stopped via control-c")
tcpingCmd.Flags().IntVarP(&tcpingFlags.Count, "count", "c", 4,
"send pings for n times")
tcpingCmd.Flags().IntVarP(&tcpingFlags.Second, "second", "s", 0,
"send pings for n seconds. Overwrite `count` if exists")
tcpingCmd.Flags().IntVarP(&tcpingFlags.Timeout, "timeout", "u", 5,
"connection timeout for every ping")
tcpingCmd.Flags().BoolVarP(&tcpingFlags.ExitOnce, "exit", "e", false,
"automatically exit on a successful ping")
tcpingCmd.Flags().Float64VarP(&tcpingFlags.Wait, "wait", "w", 0.5,
"wait n(float64) seconds between pings")
}
const (
tcpingOpen = iota
tcpingNoResponse
tcpingRST
tcpingUnknown
)
type tcpingResult struct {
Addr string
Num int
Dur time.Duration
}
func (t tcpingResult) GetStatus() string {
var tcpingStatus = map[int]string{
tcpingOpen: "Port is open (open)",
tcpingNoResponse: "No response (filtered)",
tcpingRST: "Respond with RST (closed)",
tcpingUnknown: "Unknown error",
}
return tcpingStatus[t.Num]
}
func (t tcpingResult) WriteOut(writer io.Writer) {
_, err := fmt.Fprintln(writer, "Probing "+t.Addr+"/tcp - "+t.GetStatus()+" - time="+t.Dur.String())
if err != nil {
log.Println("cannot write tcping result: " + err.Error())
}
}
func doTcpingOnce(address string) tcpingResult {
defer time.Sleep(time.Duration(tcpingFlags.Wait * float64(time.Second)))
t := time.Now()
dialer, err := util.GetProxyDialer(persistentFlags.Proxy,
time.Duration(tcpingFlags.Timeout)*time.Second)
if err != nil {
log.Fatalln("cannot get dialer: " + err.Error())
}
ctx, cancel := context.WithTimeout(context.Background(), time.Duration(tcpingFlags.Timeout)*time.Second)
defer cancel()
conn, err := dialer.(proxy.ContextDialer).DialContext(ctx, "tcp", address)
if err != nil {
if strings.Contains(err.Error(), "actively refused") ||
strings.Contains(err.Error(), "connection refused") {
return tcpingResult{Num: tcpingRST, Dur: time.Since(t), Addr: address}
} else if errors.Is(err, context.DeadlineExceeded) ||
errors.Is(err, syscall.ETIMEDOUT) ||
errors.Is(err, os.ErrDeadlineExceeded) {
return tcpingResult{Num: tcpingNoResponse, Dur: time.Since(t), Addr: address}
} else {
log.Println(err)
return tcpingResult{Num: tcpingUnknown, Dur: time.Since(t), Addr: address}
}
}
defer conn.Close()
return tcpingResult{Num: tcpingOpen, Dur: time.Since(t), Addr: address}
}