-
Notifications
You must be signed in to change notification settings - Fork 0
/
tcpproxy.go
174 lines (147 loc) · 3.87 KB
/
tcpproxy.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
package main
import (
"flag"
"fmt"
"github.com/cybwan/gadget/pkg/sockopt"
"github.com/spf13/pflag"
"net"
"os"
"regexp"
"strings"
"github.com/cybwan/gadget/pkg/log"
"github.com/cybwan/gadget/pkg/proxy"
)
var (
flags = pflag.NewFlagSet(`tcp-proxy`, pflag.ExitOnError)
localAddr string
remoteAddr string
verbose bool
veryverbose bool
nagles bool
hex bool
colors bool
unwrapTLS bool
match string
replace string
)
var (
matchid = uint64(0)
connid = uint64(0)
logger log.ColorLogger
)
func init() {
flags.StringVarP(&localAddr, "localAddr", "l", ":15001", "local address")
flags.StringVarP(&remoteAddr, "remoteAddr", "r", "httpbin.org:80", "remote address")
flags.BoolVarP(&verbose, "verbose", "v", false, "display server actions")
flags.BoolVarP(&veryverbose, "veryverbose", "a", false, "display server actions and all tcp data")
flags.BoolVarP(&nagles, "nagles", "n", false, "disable nagles algorithm")
flags.BoolVarP(&hex, "hex", "h", false, "output hex")
flags.BoolVarP(&colors, "colors", "c", false, "output ansi colors")
flags.BoolVarP(&unwrapTLS, "unwrapTLS", "u", false, "remote connection with TLS exposed unencrypted locally")
flags.StringVarP(&match, "match", "m", "", "match regex (in the form 'regex')")
flags.StringVarP(&replace, "replace", "e", "", "replace regex (in the form 'regex~replacer')")
}
func parseFlags() error {
if err := flags.Parse(os.Args); err != nil {
return err
}
_ = flag.CommandLine.Parse([]string{})
return nil
}
func main() {
if err := parseFlags(); err != nil {
os.Exit(1)
}
logger := log.ColorLogger{
Verbose: verbose,
Color: colors,
}
logger.Info("tcp-proxy proxing from %v to %v ", localAddr, remoteAddr)
laddr, err := net.ResolveTCPAddr("tcp", localAddr)
if err != nil {
logger.Warn("Failed to resolve local address: %s", err)
os.Exit(1)
}
raddr, err := net.ResolveTCPAddr("tcp", remoteAddr)
if err != nil {
logger.Warn("Failed to resolve remote address: %s", err)
os.Exit(1)
}
listener, err := net.ListenTCP("tcp", laddr)
if err != nil {
logger.Warn("Failed to open local port to listen: %s", err)
os.Exit(1)
}
matcher := createMatcher(match)
replacer := createReplacer(replace)
if veryverbose {
verbose = true
}
for {
conn, err := listener.AcceptTCP()
if err != nil {
logger.Warn("Failed to accept connection '%s'", err)
continue
}
orginalIp, orginalPort, _ := sockopt.GetOriginalDest(conn)
logger.Warn("OrginalDest ******* %s:%d *******", orginalIp, orginalPort)
connid++
var p *proxy.Proxy
if unwrapTLS {
logger.Info("Unwrapping TLS")
p = proxy.NewTLSUnwrapped(conn, laddr, raddr, remoteAddr)
} else {
p = proxy.New(conn, laddr, raddr)
}
p.Matcher = matcher
p.Replacer = replacer
p.Nagles = nagles
p.OutputHex = hex
p.Log = log.ColorLogger{
Verbose: verbose,
VeryVerbose: veryverbose,
Prefix: fmt.Sprintf("Connection #%03d ", connid),
Color: colors,
}
go p.Start()
}
}
func createMatcher(match string) func([]byte) {
if match == "" {
return nil
}
re, err := regexp.Compile(match)
if err != nil {
logger.Warn("Invalid match regex: %s", err)
return nil
}
logger.Info("Matching %s", re.String())
return func(input []byte) {
ms := re.FindAll(input, -1)
for _, m := range ms {
matchid++
logger.Info("Match #%d: %s", matchid, string(m))
}
}
}
func createReplacer(replace string) func([]byte) []byte {
if replace == "" {
return nil
}
//split by / (TODO: allow slash escapes)
parts := strings.Split(replace, "~")
if len(parts) != 2 {
logger.Warn("Invalid replace option")
return nil
}
re, err := regexp.Compile(string(parts[0]))
if err != nil {
logger.Warn("Invalid replace regex: %s", err)
return nil
}
repl := []byte(parts[1])
logger.Info("Replacing %s with %s", re.String(), repl)
return func(input []byte) []byte {
return re.ReplaceAll(input, repl)
}
}