forked from shawn1m/overture
-
Notifications
You must be signed in to change notification settings - Fork 0
/
base_resolver.go
178 lines (159 loc) · 4.79 KB
/
base_resolver.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
/*
* Copyright (c) 2019 shawn1m. All rights reserved.
* Use of this source code is governed by The MIT License (MIT) that can be
* found in the LICENSE file..
*/
package resolver
import (
"net"
"time"
"github.com/miekg/dns"
"github.com/silenceper/pool"
log "github.com/sirupsen/logrus"
"golang.org/x/net/proxy"
"github.com/travertexs/overture/core/common"
)
type Resolver interface {
Exchange(*dns.Msg) (*dns.Msg, error)
Init() error
}
type BaseResolver struct {
dnsUpstream *common.DNSUpstream
}
func (r *BaseResolver) Exchange(q *dns.Msg) (*dns.Msg, error) {
conn, err := r.CreateBaseConn()
if err != nil {
return nil, err
}
defer conn.Close()
return r.exchangeByConnWithoutClose(q, conn)
}
func (r *BaseResolver) exchangeByConnWithoutClose(q *dns.Msg, conn net.Conn) (msg *dns.Msg, err error) {
if conn == nil {
log.Fatal("Conn not initialized for exchangeByDNSClient")
return nil, err
}
r.setTimeout(conn)
dc := &dns.Conn{Conn: conn, UDPSize: 65535}
err = dc.WriteMsg(q)
if err != nil {
log.Warnf("%s Fail: Send question message failed", r.dnsUpstream.Name)
return nil, err
}
return dc.ReadMsg()
}
func (r *BaseResolver) Init() error {
if r.dnsUpstream.TCPPoolConfig.Enable {
if r.dnsUpstream.TCPPoolConfig.IdleTimeout != 0 {
IdleTimeout = time.Duration(r.dnsUpstream.TCPPoolConfig.IdleTimeout) * time.Second
}
if r.dnsUpstream.TCPPoolConfig.MaxCapacity != 0 {
MaxCapacity = r.dnsUpstream.TCPPoolConfig.MaxCapacity
}
if r.dnsUpstream.TCPPoolConfig.InitialCapacity != 0 {
InitialCapacity = r.dnsUpstream.TCPPoolConfig.InitialCapacity
}
}
return nil
}
func NewResolver(u *common.DNSUpstream) Resolver {
var resolver Resolver
switch u.Protocol {
case "udp":
resolver = &UDPResolver{BaseResolver: BaseResolver{u}}
case "tcp":
resolver = &TCPResolver{BaseResolver: BaseResolver{u}}
case "tcp-tls":
resolver = &TCPTLSResolver{BaseResolver: BaseResolver{u}}
case "https":
resolver = &HTTPSResolver{BaseResolver: BaseResolver{u}}
case "http3":
resolver = &HTTP3Resolver{BaseResolver: BaseResolver{u}}
default:
log.Fatalf("Unsupported protocol: %s", u.Protocol)
log.Errorf("Create resolver for %s failed", u.Name)
return nil
}
err := resolver.Init()
if err != nil {
log.Errorf("Init resolver for %s failed", u.Name)
} else {
log.Debugf("Init resolver for %s succeed", u.Name)
}
return resolver
}
func (r *BaseResolver) CreateBaseConn() (net.Conn, error) {
dialer := net.Dialer{Timeout: r.getDialTimeout()}
dialerFunc := dialer.Dial
if r.dnsUpstream.SOCKS5Address != "" {
socksAddress, err := ExtractFullUrl(r.dnsUpstream.SOCKS5Address, "socks5")
if err != nil {
return nil, err
}
network := ToNetwork(r.dnsUpstream.Protocol)
s, err := proxy.SOCKS5(network, socksAddress, nil, proxy.Direct)
if err != nil {
log.Warnf("Failed to connect to SOCKS5 proxy: %s", err)
return nil, err
}
dialerFunc = s.Dial
}
network := ToNetwork(r.dnsUpstream.Protocol)
host, port, err := ExtractDNSAddress(r.dnsUpstream.Address, r.dnsUpstream.Protocol)
if err != nil {
return nil, err
}
address := net.JoinHostPort(host, port)
log.Debugf("Creating new connection to %s:%s", host, port)
var conn net.Conn
if conn, err = dialerFunc(network, address); err != nil {
log.Warnf("Failed to connect to DNS upstream: %s", err)
return nil, err
}
// the Timeout setting is now moved to each resolver to support pool's idle timeout
// r.setTimeout(conn)
return conn, err
}
var InitialCapacity = 0
var IdleTimeout = 30 * time.Second
var MaxCapacity = 15
func (r *BaseResolver) setTimeout(conn net.Conn) {
dnsTimeout := time.Duration(r.dnsUpstream.Timeout) * time.Second / 3
conn.SetDeadline(time.Now().Add(dnsTimeout))
conn.SetReadDeadline(time.Now().Add(dnsTimeout))
conn.SetWriteDeadline(time.Now().Add(dnsTimeout))
}
func (r *BaseResolver) getDialTimeout() time.Duration {
return time.Duration(r.dnsUpstream.Timeout) * time.Second / 3
}
func (r *BaseResolver) setIdleTimeout(conn net.Conn) {
conn.SetDeadline(time.Now().Add(IdleTimeout))
conn.SetReadDeadline(time.Now().Add(IdleTimeout))
conn.SetWriteDeadline(time.Now().Add(IdleTimeout))
}
func (r *BaseResolver) createConnectionPool(connCreate func() (interface{}, error), connClose func(interface{}) error) (pool.Pool, error) {
poolConfig := &pool.Config{
InitialCap: InitialCapacity,
MaxCap: MaxCapacity,
Factory: connCreate,
Close: connClose,
//Ping: ping,
IdleTimeout: IdleTimeout,
}
return pool.NewChannelPool(poolConfig)
}
func (r *BaseResolver) exchangeByPool(q *dns.Msg, poolConn pool.Pool) (msg *dns.Msg, err error) {
_conn, err := poolConn.Get()
if err != nil {
return nil, err
}
conn := _conn.(net.Conn)
ret, err := r.exchangeByConnWithoutClose(q, conn)
if err != nil {
poolConn.Close(conn)
} else {
r.setIdleTimeout(conn)
poolConn.Put(conn)
}
return ret, err
}