/
dns.go
358 lines (320 loc) · 9.98 KB
/
dns.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
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
package conf
import (
"encoding/json"
"sort"
"strings"
"github.com/xtls/xray-core/app/dns"
"github.com/xtls/xray-core/app/router"
"github.com/xtls/xray-core/common/net"
)
type NameServerConfig struct {
Address *Address
ClientIP *Address
Port uint16
SkipFallback bool
Domains []string
ExpectIPs StringList
QueryStrategy string
}
func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
var address Address
if err := json.Unmarshal(data, &address); err == nil {
c.Address = &address
return nil
}
var advanced struct {
Address *Address `json:"address"`
ClientIP *Address `json:"clientIp"`
Port uint16 `json:"port"`
SkipFallback bool `json:"skipFallback"`
Domains []string `json:"domains"`
ExpectIPs StringList `json:"expectIps"`
QueryStrategy string `json:"queryStrategy"`
}
if err := json.Unmarshal(data, &advanced); err == nil {
c.Address = advanced.Address
c.ClientIP = advanced.ClientIP
c.Port = advanced.Port
c.SkipFallback = advanced.SkipFallback
c.Domains = advanced.Domains
c.ExpectIPs = advanced.ExpectIPs
c.QueryStrategy = advanced.QueryStrategy
return nil
}
return newError("failed to parse name server: ", string(data))
}
func toDomainMatchingType(t router.Domain_Type) dns.DomainMatchingType {
switch t {
case router.Domain_Domain:
return dns.DomainMatchingType_Subdomain
case router.Domain_Full:
return dns.DomainMatchingType_Full
case router.Domain_Plain:
return dns.DomainMatchingType_Keyword
case router.Domain_Regex:
return dns.DomainMatchingType_Regex
default:
panic("unknown domain type")
}
}
func (c *NameServerConfig) Build() (*dns.NameServer, error) {
if c.Address == nil {
return nil, newError("NameServer address is not specified.")
}
var domains []*dns.NameServer_PriorityDomain
var originalRules []*dns.NameServer_OriginalRule
for _, rule := range c.Domains {
parsedDomain, err := parseDomainRule(rule)
if err != nil {
return nil, newError("invalid domain rule: ", rule).Base(err)
}
for _, pd := range parsedDomain {
domains = append(domains, &dns.NameServer_PriorityDomain{
Type: toDomainMatchingType(pd.Type),
Domain: pd.Value,
})
}
originalRules = append(originalRules, &dns.NameServer_OriginalRule{
Rule: rule,
Size: uint32(len(parsedDomain)),
})
}
geoipList, err := ToCidrList(c.ExpectIPs)
if err != nil {
return nil, newError("invalid IP rule: ", c.ExpectIPs).Base(err)
}
var myClientIP []byte
if c.ClientIP != nil {
if !c.ClientIP.Family().IsIP() {
return nil, newError("not an IP address:", c.ClientIP.String())
}
myClientIP = []byte(c.ClientIP.IP())
}
return &dns.NameServer{
Address: &net.Endpoint{
Network: net.Network_UDP,
Address: c.Address.Build(),
Port: uint32(c.Port),
},
ClientIp: myClientIP,
SkipFallback: c.SkipFallback,
PrioritizedDomain: domains,
Geoip: geoipList,
OriginalRules: originalRules,
QueryStrategy: resolveQueryStrategy(c.QueryStrategy),
}, nil
}
var typeMap = map[router.Domain_Type]dns.DomainMatchingType{
router.Domain_Full: dns.DomainMatchingType_Full,
router.Domain_Domain: dns.DomainMatchingType_Subdomain,
router.Domain_Plain: dns.DomainMatchingType_Keyword,
router.Domain_Regex: dns.DomainMatchingType_Regex,
}
// DNSConfig is a JSON serializable object for dns.Config.
type DNSConfig struct {
Servers []*NameServerConfig `json:"servers"`
Hosts *HostsWrapper `json:"hosts"`
ClientIP *Address `json:"clientIp"`
Tag string `json:"tag"`
QueryStrategy string `json:"queryStrategy"`
DisableCache bool `json:"disableCache"`
DisableFallback bool `json:"disableFallback"`
DisableFallbackIfMatch bool `json:"disableFallbackIfMatch"`
}
type HostAddress struct {
addr *Address
addrs []*Address
}
// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
func (h *HostAddress) UnmarshalJSON(data []byte) error {
addr := new(Address)
var addrs []*Address
switch {
case json.Unmarshal(data, &addr) == nil:
h.addr = addr
case json.Unmarshal(data, &addrs) == nil:
h.addrs = addrs
default:
return newError("invalid address")
}
return nil
}
type HostsWrapper struct {
Hosts map[string]*HostAddress
}
func getHostMapping(ha *HostAddress) *dns.Config_HostMapping {
if ha.addr != nil {
if ha.addr.Family().IsDomain() {
return &dns.Config_HostMapping{
ProxiedDomain: ha.addr.Domain(),
}
}
return &dns.Config_HostMapping{
Ip: [][]byte{ha.addr.IP()},
}
}
ips := make([][]byte, 0, len(ha.addrs))
for _, addr := range ha.addrs {
if addr.Family().IsDomain() {
return &dns.Config_HostMapping{
ProxiedDomain: addr.Domain(),
}
}
ips = append(ips, []byte(addr.IP()))
}
return &dns.Config_HostMapping{
Ip: ips,
}
}
// UnmarshalJSON implements encoding/json.Unmarshaler.UnmarshalJSON
func (m *HostsWrapper) UnmarshalJSON(data []byte) error {
hosts := make(map[string]*HostAddress)
err := json.Unmarshal(data, &hosts)
if err == nil {
m.Hosts = hosts
return nil
}
return newError("invalid DNS hosts").Base(err)
}
// Build implements Buildable
func (m *HostsWrapper) Build() ([]*dns.Config_HostMapping, error) {
mappings := make([]*dns.Config_HostMapping, 0, 20)
domains := make([]string, 0, len(m.Hosts))
for domain := range m.Hosts {
domains = append(domains, domain)
}
sort.Strings(domains)
for _, domain := range domains {
switch {
case strings.HasPrefix(domain, "domain:"):
domainName := domain[7:]
if len(domainName) == 0 {
return nil, newError("empty domain type of rule: ", domain)
}
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Subdomain
mapping.Domain = domainName
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "geosite:"):
listName := domain[8:]
if len(listName) == 0 {
return nil, newError("empty geosite rule: ", domain)
}
geositeList, err := loadGeositeWithAttr("geosite.dat", listName)
if err != nil {
return nil, newError("failed to load geosite: ", listName).Base(err)
}
for _, d := range geositeList {
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = typeMap[d.Type]
mapping.Domain = d.Value
mappings = append(mappings, mapping)
}
case strings.HasPrefix(domain, "regexp:"):
regexpVal := domain[7:]
if len(regexpVal) == 0 {
return nil, newError("empty regexp type of rule: ", domain)
}
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Regex
mapping.Domain = regexpVal
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "keyword:"):
keywordVal := domain[8:]
if len(keywordVal) == 0 {
return nil, newError("empty keyword type of rule: ", domain)
}
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Keyword
mapping.Domain = keywordVal
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "full:"):
fullVal := domain[5:]
if len(fullVal) == 0 {
return nil, newError("empty full domain type of rule: ", domain)
}
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Full
mapping.Domain = fullVal
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "dotless:"):
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Regex
switch substr := domain[8:]; {
case substr == "":
mapping.Domain = "^[^.]*$"
case !strings.Contains(substr, "."):
mapping.Domain = "^[^.]*" + substr + "[^.]*$"
default:
return nil, newError("substr in dotless rule should not contain a dot: ", substr)
}
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "ext:"):
kv := strings.Split(domain[4:], ":")
if len(kv) != 2 {
return nil, newError("invalid external resource: ", domain)
}
filename := kv[0]
list := kv[1]
geositeList, err := loadGeositeWithAttr(filename, list)
if err != nil {
return nil, newError("failed to load domain list: ", list, " from ", filename).Base(err)
}
for _, d := range geositeList {
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = typeMap[d.Type]
mapping.Domain = d.Value
mappings = append(mappings, mapping)
}
default:
mapping := getHostMapping(m.Hosts[domain])
mapping.Type = dns.DomainMatchingType_Full
mapping.Domain = domain
mappings = append(mappings, mapping)
}
}
return mappings, nil
}
// Build implements Buildable
func (c *DNSConfig) Build() (*dns.Config, error) {
config := &dns.Config{
Tag: c.Tag,
DisableCache: c.DisableCache,
DisableFallback: c.DisableFallback,
DisableFallbackIfMatch: c.DisableFallbackIfMatch,
QueryStrategy: resolveQueryStrategy(c.QueryStrategy),
}
if c.ClientIP != nil {
if !c.ClientIP.Family().IsIP() {
return nil, newError("not an IP address:", c.ClientIP.String())
}
config.ClientIp = []byte(c.ClientIP.IP())
}
for _, server := range c.Servers {
ns, err := server.Build()
if err != nil {
return nil, newError("failed to build nameserver").Base(err)
}
config.NameServer = append(config.NameServer, ns)
}
if c.Hosts != nil {
staticHosts, err := c.Hosts.Build()
if err != nil {
return nil, newError("failed to build hosts").Base(err)
}
config.StaticHosts = append(config.StaticHosts, staticHosts...)
}
return config, nil
}
func resolveQueryStrategy(queryStrategy string) dns.QueryStrategy {
switch strings.ToLower(queryStrategy) {
case "useip", "use_ip", "use-ip":
return dns.QueryStrategy_USE_IP
case "useip4", "useipv4", "use_ip4", "use_ipv4", "use_ip_v4", "use-ip4", "use-ipv4", "use-ip-v4":
return dns.QueryStrategy_USE_IP4
case "useip6", "useipv6", "use_ip6", "use_ipv6", "use_ip_v6", "use-ip6", "use-ipv6", "use-ip-v6":
return dns.QueryStrategy_USE_IP6
default:
return dns.QueryStrategy_USE_IP
}
}