sing-box/route/router.go

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package route
import (
"context"
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"io"
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"net"
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"net/http"
"os"
"path/filepath"
"time"
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"github.com/oschwald/geoip2-golang"
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"github.com/sagernet/sing-box/adapter"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing/common"
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E "github.com/sagernet/sing/common/exceptions"
F "github.com/sagernet/sing/common/format"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
)
var _ adapter.Router = (*Router)(nil)
type Router struct {
ctx context.Context
logger log.Logger
outboundByTag map[string]adapter.Outbound
rules []adapter.Rule
defaultDetour string
defaultOutboundForConnection adapter.Outbound
defaultOutboundForPacketConnection adapter.Outbound
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needGeoDatabase bool
geoOptions option.GeoIPOptions
geoReader *geoip2.Reader
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}
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func NewRouter(ctx context.Context, logger log.Logger, options option.RouteOptions) (*Router, error) {
router := &Router{
ctx: ctx,
logger: logger.WithPrefix("router: "),
outboundByTag: make(map[string]adapter.Outbound),
rules: make([]adapter.Rule, 0, len(options.Rules)),
needGeoDatabase: hasGeoRule(options.Rules),
geoOptions: common.PtrValueOrDefault(options.GeoIP),
defaultDetour: options.DefaultDetour,
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}
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for i, ruleOptions := range options.Rules {
rule, err := NewRule(router, logger, ruleOptions)
if err != nil {
return nil, E.Cause(err, "parse rule[", i, "]")
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}
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router.rules = append(router.rules, rule)
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}
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return router, nil
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}
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func hasGeoRule(rules []option.Rule) bool {
for _, rule := range rules {
switch rule.Type {
case C.RuleTypeDefault:
if isGeoRule(rule.DefaultOptions) {
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return true
}
case C.RuleTypeLogical:
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for _, subRule := range rule.LogicalOptions.Rules {
if isGeoRule(subRule) {
return true
}
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}
}
}
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return false
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}
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func isGeoRule(rule option.DefaultRule) bool {
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return len(rule.SourceGeoIP) > 0 && common.Any(rule.SourceGeoIP, notPrivateNode) || len(rule.GeoIP) > 0 && common.Any(rule.GeoIP, notPrivateNode)
}
func notPrivateNode(code string) bool {
return code == "private"
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}
func (r *Router) Initialize(outbounds []adapter.Outbound, defaultOutbound func() adapter.Outbound) error {
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outboundByTag := make(map[string]adapter.Outbound)
for _, detour := range outbounds {
outboundByTag[detour.Tag()] = detour
}
var defaultOutboundForConnection adapter.Outbound
var defaultOutboundForPacketConnection adapter.Outbound
if r.defaultDetour != "" {
detour, loaded := outboundByTag[r.defaultDetour]
if !loaded {
return E.New("default detour not found: ", r.defaultDetour)
}
if common.Contains(detour.Network(), C.NetworkTCP) {
defaultOutboundForConnection = detour
}
if common.Contains(detour.Network(), C.NetworkUDP) {
defaultOutboundForPacketConnection = detour
}
}
var index, packetIndex int
if defaultOutboundForConnection == nil {
for i, detour := range outbounds {
if common.Contains(detour.Network(), C.NetworkTCP) {
index = i
defaultOutboundForConnection = detour
break
}
}
}
if defaultOutboundForPacketConnection == nil {
for i, detour := range outbounds {
if common.Contains(detour.Network(), C.NetworkUDP) {
packetIndex = i
defaultOutboundForPacketConnection = detour
break
}
}
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}
if defaultOutboundForConnection == nil || defaultOutboundForPacketConnection == nil {
detour := defaultOutbound()
if defaultOutboundForConnection == nil {
defaultOutboundForConnection = detour
}
if defaultOutboundForPacketConnection == nil {
defaultOutboundForPacketConnection = detour
}
}
if defaultOutboundForConnection != defaultOutboundForPacketConnection {
var description string
if defaultOutboundForConnection.Tag() != "" {
description = defaultOutboundForConnection.Tag()
} else {
description = F.ToString(index)
}
var packetDescription string
if defaultOutboundForPacketConnection.Tag() != "" {
packetDescription = defaultOutboundForPacketConnection.Tag()
} else {
packetDescription = F.ToString(packetIndex)
}
r.logger.Info("using ", defaultOutboundForConnection.Type(), "[", description, "] as default outbound for connection")
r.logger.Info("using ", defaultOutboundForPacketConnection.Type(), "[", packetDescription, "] as default outbound for packet connection")
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}
r.defaultOutboundForConnection = defaultOutboundForConnection
r.defaultOutboundForPacketConnection = defaultOutboundForPacketConnection
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r.outboundByTag = outboundByTag
return nil
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}
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func (r *Router) Start() error {
if r.needGeoDatabase {
go r.prepareGeoIPDatabase()
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}
return nil
}
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func (r *Router) Close() error {
return common.Close(
common.PtrOrNil(r.geoReader),
)
}
func (r *Router) GeoIPReader() *geoip2.Reader {
return r.geoReader
}
func (r *Router) prepareGeoIPDatabase() {
var geoPath string
if r.geoOptions.Path != "" {
geoPath = r.geoOptions.Path
} else {
geoPath = "Country.mmdb"
}
geoPath, loaded := C.Find(geoPath)
if !loaded {
r.logger.Warn("geoip database not exists: ", geoPath)
var err error
for attempts := 0; attempts < 3; attempts++ {
err = r.downloadGeoIPDatabase(geoPath)
if err == nil {
break
}
r.logger.Error("download geoip database: ", err)
os.Remove(geoPath)
time.Sleep(10 * time.Second)
}
if err != nil {
return
}
}
geoReader, err := geoip2.Open(geoPath)
if err == nil {
r.logger.Info("loaded geoip database")
r.geoReader = geoReader
} else {
r.logger.Error("open geoip database: ", err)
return
}
}
func (r *Router) downloadGeoIPDatabase(savePath string) error {
var downloadURL string
if r.geoOptions.DownloadURL != "" {
downloadURL = r.geoOptions.DownloadURL
} else {
downloadURL = "https://cdn.jsdelivr.net/gh/Dreamacro/maxmind-geoip@release/Country.mmdb"
}
r.logger.Info("downloading geoip database")
var detour adapter.Outbound
if r.geoOptions.DownloadDetour != "" {
outbound, loaded := r.Outbound(r.geoOptions.DownloadDetour)
if !loaded {
return E.New("detour outbound not found: ", r.geoOptions.DownloadDetour)
}
detour = outbound
} else {
detour = r.defaultOutboundForConnection
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}
if parentDir := filepath.Dir(savePath); parentDir != "" {
os.MkdirAll(parentDir, 0o755)
}
saveFile, err := os.OpenFile(savePath, os.O_CREATE|os.O_WRONLY, 0o644)
if err != nil {
return E.Cause(err, "open output file: ", downloadURL)
}
defer saveFile.Close()
httpClient := &http.Client{
Timeout: 5 * time.Second,
Transport: &http.Transport{
ForceAttemptHTTP2: true,
TLSHandshakeTimeout: 5 * time.Second,
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return detour.DialContext(ctx, network, M.ParseSocksaddr(addr))
},
},
}
response, err := httpClient.Get(downloadURL)
if err != nil {
return err
}
defer response.Body.Close()
_, err = io.Copy(saveFile, response.Body)
return err
}
func (r *Router) Outbound(tag string) (adapter.Outbound, bool) {
outbound, loaded := r.outboundByTag[tag]
return outbound, loaded
}
func (r *Router) RouteConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
detour := r.match(ctx, metadata, r.defaultOutboundForConnection)
if !common.Contains(detour.Network(), C.NetworkTCP) {
conn.Close()
return E.New("missing supported outbound, closing connection")
}
return detour.NewConnection(ctx, conn, metadata.Destination)
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}
func (r *Router) RoutePacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
detour := r.match(ctx, metadata, r.defaultOutboundForPacketConnection)
if !common.Contains(detour.Network(), C.NetworkUDP) {
conn.Close()
return E.New("missing supported outbound, closing packet connection")
}
return detour.NewPacketConnection(ctx, conn, metadata.Destination)
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}
func (r *Router) match(ctx context.Context, metadata adapter.InboundContext, defaultOutbound adapter.Outbound) adapter.Outbound {
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for i, rule := range r.rules {
if rule.Match(&metadata) {
detour := rule.Outbound()
r.logger.WithContext(ctx).Info("match [", i, "]", rule.String(), " => ", detour)
if outbound, loaded := r.Outbound(detour); loaded {
return outbound
}
r.logger.WithContext(ctx).Error("outbound not found: ", detour)
}
}
r.logger.WithContext(ctx).Info("no match")
return defaultOutbound
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}