Xray-core/infra/conf/dns.go
2020-12-24 19:45:35 +00:00

261 lines
7.0 KiB
Go

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
Port uint16
Domains []string
ExpectIPs StringList
}
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"`
Port uint16 `json:"port"`
Domains []string `json:"domains"`
ExpectIPs StringList `json:"expectIps"`
}
if err := json.Unmarshal(data, &advanced); err == nil {
c.Address = advanced.Address
c.Port = advanced.Port
c.Domains = advanced.Domains
c.ExpectIPs = advanced.ExpectIPs
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)
}
return &dns.NameServer{
Address: &net.Endpoint{
Network: net.Network_UDP,
Address: c.Address.Build(),
Port: uint32(c.Port),
},
PrioritizedDomain: domains,
Geoip: geoipList,
OriginalRules: originalRules,
}, 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 map[string]*Address `json:"hosts"`
ClientIP *Address `json:"clientIp"`
Tag string `json:"tag"`
}
func getHostMapping(addr *Address) *dns.Config_HostMapping {
if addr.Family().IsIP() {
return &dns.Config_HostMapping{
Ip: [][]byte{[]byte(addr.IP())},
}
} else {
return &dns.Config_HostMapping{
ProxiedDomain: addr.Domain(),
}
}
}
// Build implements Buildable
func (c *DNSConfig) Build() (*dns.Config, error) {
config := &dns.Config{
Tag: c.Tag,
}
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 && len(c.Hosts) > 0 {
domains := make([]string, 0, len(c.Hosts))
for domain := range c.Hosts {
domains = append(domains, domain)
}
sort.Strings(domains)
for _, domain := range domains {
addr := c.Hosts[domain]
var mappings []*dns.Config_HostMapping
switch {
case strings.HasPrefix(domain, "domain:"):
domainName := domain[7:]
if len(domainName) == 0 {
return nil, newError("empty domain type of rule: ", domain)
}
mapping := getHostMapping(addr)
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)
}
domains, err := loadGeositeWithAttr("geosite.dat", listName)
if err != nil {
return nil, newError("failed to load geosite: ", listName).Base(err)
}
for _, d := range domains {
mapping := getHostMapping(addr)
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(addr)
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(addr)
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(addr)
mapping.Type = dns.DomainMatchingType_Full
mapping.Domain = fullVal
mappings = append(mappings, mapping)
case strings.HasPrefix(domain, "dotless:"):
mapping := getHostMapping(addr)
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]
domains, err := loadGeositeWithAttr(filename, list)
if err != nil {
return nil, newError("failed to load domain list: ", list, " from ", filename).Base(err)
}
for _, d := range domains {
mapping := getHostMapping(addr)
mapping.Type = typeMap[d.Type]
mapping.Domain = d.Value
mappings = append(mappings, mapping)
}
default:
mapping := getHostMapping(addr)
mapping.Type = dns.DomainMatchingType_Full
mapping.Domain = domain
mappings = append(mappings, mapping)
}
config.StaticHosts = append(config.StaticHosts, mappings...)
}
}
return config, nil
}