mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-17 18:06:15 -05:00
221 lines
7.7 KiB
Go
221 lines
7.7 KiB
Go
package dns
|
||
|
||
import (
|
||
"context"
|
||
"net/url"
|
||
"strings"
|
||
"time"
|
||
|
||
core "github.com/v2fly/v2ray-core/v4"
|
||
"github.com/v2fly/v2ray-core/v4/app/router"
|
||
"github.com/v2fly/v2ray-core/v4/common/errors"
|
||
"github.com/v2fly/v2ray-core/v4/common/net"
|
||
"github.com/v2fly/v2ray-core/v4/common/strmatcher"
|
||
"github.com/v2fly/v2ray-core/v4/features/dns"
|
||
"github.com/v2fly/v2ray-core/v4/features/routing"
|
||
)
|
||
|
||
// Server is the interface for Name Server.
|
||
type Server interface {
|
||
// Name of the Client.
|
||
Name() string
|
||
// QueryIP sends IP queries to its configured server.
|
||
QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns.IPOption, disableCache bool) ([]net.IP, error)
|
||
}
|
||
|
||
// Client is the interface for DNS client.
|
||
type Client struct {
|
||
server Server
|
||
clientIP net.IP
|
||
skipFallback bool
|
||
domains []string
|
||
expectIPs []*router.GeoIPMatcher
|
||
}
|
||
|
||
var errExpectedIPNonMatch = errors.New("expectIPs not match")
|
||
|
||
// NewServer creates a name server object according to the network destination url.
|
||
func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, error) {
|
||
if address := dest.Address; address.Family().IsDomain() {
|
||
u, err := url.Parse(address.Domain())
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
switch {
|
||
case strings.EqualFold(u.String(), "localhost"):
|
||
return NewLocalNameServer(), nil
|
||
case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode
|
||
return NewDoHNameServer(u, dispatcher)
|
||
case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode
|
||
return NewDoHLocalNameServer(u), nil
|
||
case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
|
||
return NewQUICNameServer(u)
|
||
case strings.EqualFold(u.Scheme, "tcp"): // DNS-over-TCP Remote mode
|
||
return NewTCPNameServer(u, dispatcher)
|
||
case strings.EqualFold(u.Scheme, "tcp+local"): // DNS-over-TCP Local mode
|
||
return NewTCPLocalNameServer(u)
|
||
case strings.EqualFold(u.String(), "fakedns"):
|
||
return NewFakeDNSServer(), nil
|
||
}
|
||
}
|
||
if dest.Network == net.Network_Unknown {
|
||
dest.Network = net.Network_UDP
|
||
}
|
||
if dest.Network == net.Network_UDP { // UDP classic DNS mode
|
||
return NewClassicNameServer(dest, dispatcher), nil
|
||
}
|
||
return nil, newError("No available name server could be created from ", dest).AtWarning()
|
||
}
|
||
|
||
// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
|
||
func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container router.GeoIPMatcherContainer, matcherInfos *[]DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []DomainMatcherInfo) error) (*Client, error) {
|
||
client := &Client{}
|
||
|
||
err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
|
||
// Create a new server for each client for now
|
||
server, err := NewServer(ns.Address.AsDestination(), dispatcher)
|
||
if err != nil {
|
||
return newError("failed to create nameserver").Base(err).AtWarning()
|
||
}
|
||
|
||
// Priotize local domains with specific TLDs or without any dot to local DNS
|
||
if _, isLocalDNS := server.(*LocalNameServer); isLocalDNS {
|
||
ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
|
||
ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
|
||
// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
|
||
// Because the `localhost` DNS client will apend len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
|
||
// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
|
||
// To avoid this, the length of `matcherInfos` must be equal to the expected, so manually append it with Golang default zero value first for later modification.
|
||
// Related issues:
|
||
// https://github.com/v2fly/v2ray-core/issues/529
|
||
// https://github.com/v2fly/v2ray-core/issues/719
|
||
for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
|
||
*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
|
||
clientIdx: uint16(0),
|
||
domainRuleIdx: uint16(0),
|
||
})
|
||
}
|
||
}
|
||
|
||
// Establish domain rules
|
||
var rules []string
|
||
ruleCurr := 0
|
||
ruleIter := 0
|
||
for _, domain := range ns.PrioritizedDomain {
|
||
domainRule, err := toStrMatcher(domain.Type, domain.Domain)
|
||
if err != nil {
|
||
return newError("failed to create prioritized domain").Base(err).AtWarning()
|
||
}
|
||
originalRuleIdx := ruleCurr
|
||
if ruleCurr < len(ns.OriginalRules) {
|
||
rule := ns.OriginalRules[ruleCurr]
|
||
if ruleCurr >= len(rules) {
|
||
rules = append(rules, rule.Rule)
|
||
}
|
||
ruleIter++
|
||
if ruleIter >= int(rule.Size) {
|
||
ruleIter = 0
|
||
ruleCurr++
|
||
}
|
||
} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
|
||
rules = append(rules, domainRule.String())
|
||
ruleCurr++
|
||
}
|
||
err = updateDomainRule(domainRule, originalRuleIdx, *matcherInfos)
|
||
if err != nil {
|
||
return newError("failed to create prioritized domain").Base(err).AtWarning()
|
||
}
|
||
}
|
||
|
||
// Establish expected IPs
|
||
var matchers []*router.GeoIPMatcher
|
||
for _, geoip := range ns.Geoip {
|
||
matcher, err := container.Add(geoip)
|
||
if err != nil {
|
||
return newError("failed to create ip matcher").Base(err).AtWarning()
|
||
}
|
||
matchers = append(matchers, matcher)
|
||
}
|
||
|
||
if len(clientIP) > 0 {
|
||
switch ns.Address.Address.GetAddress().(type) {
|
||
case *net.IPOrDomain_Domain:
|
||
newError("DNS: client ", ns.Address.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
|
||
case *net.IPOrDomain_Ip:
|
||
newError("DNS: client ", ns.Address.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
|
||
}
|
||
}
|
||
|
||
client.server = server
|
||
client.clientIP = clientIP
|
||
client.skipFallback = ns.SkipFallback
|
||
client.domains = rules
|
||
client.expectIPs = matchers
|
||
return nil
|
||
})
|
||
return client, err
|
||
}
|
||
|
||
// NewSimpleClient creates a DNS client with a simple destination.
|
||
func NewSimpleClient(ctx context.Context, endpoint *net.Endpoint, clientIP net.IP) (*Client, error) {
|
||
client := &Client{}
|
||
err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
|
||
server, err := NewServer(endpoint.AsDestination(), dispatcher)
|
||
if err != nil {
|
||
return newError("failed to create nameserver").Base(err).AtWarning()
|
||
}
|
||
client.server = server
|
||
client.clientIP = clientIP
|
||
return nil
|
||
})
|
||
|
||
if len(clientIP) > 0 {
|
||
switch endpoint.Address.GetAddress().(type) {
|
||
case *net.IPOrDomain_Domain:
|
||
newError("DNS: client ", endpoint.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
|
||
case *net.IPOrDomain_Ip:
|
||
newError("DNS: client ", endpoint.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
|
||
}
|
||
}
|
||
|
||
return client, err
|
||
}
|
||
|
||
// Name returns the server name the client manages.
|
||
func (c *Client) Name() string {
|
||
return c.server.Name()
|
||
}
|
||
|
||
// QueryIP send DNS query to the name server with the client's IP.
|
||
func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, disableCache bool) ([]net.IP, error) {
|
||
ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
|
||
ips, err := c.server.QueryIP(ctx, domain, c.clientIP, option, disableCache)
|
||
cancel()
|
||
|
||
if err != nil {
|
||
return ips, err
|
||
}
|
||
return c.MatchExpectedIPs(domain, ips)
|
||
}
|
||
|
||
// MatchExpectedIPs matches queried domain IPs with expected IPs and returns matched ones.
|
||
func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) ([]net.IP, error) {
|
||
if len(c.expectIPs) == 0 {
|
||
return ips, nil
|
||
}
|
||
newIps := []net.IP{}
|
||
for _, ip := range ips {
|
||
for _, matcher := range c.expectIPs {
|
||
if matcher.Match(ip) {
|
||
newIps = append(newIps, ip)
|
||
break
|
||
}
|
||
}
|
||
}
|
||
if len(newIps) == 0 {
|
||
return nil, errExpectedIPNonMatch
|
||
}
|
||
newError("domain ", domain, " expectIPs ", newIps, " matched at server ", c.Name()).AtDebug().WriteToLog()
|
||
return newIps, nil
|
||
}
|