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Use libresolv in local DNS server on darwin

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世界 2025-08-18 14:19:49 +08:00
parent 095750bfaf
commit 7058c2e08a
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GPG Key ID: CD109927C34A63C4
15 changed files with 388 additions and 308 deletions
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19
.github/workflows/build.yml vendored
View File

@ -149,7 +149,7 @@ jobs:
TAGS='with_gvisor,with_quic,with_dhcp,with_wireguard,with_utls,with_acme,with_clash_api,with_tailscale'
echo "BUILD_TAGS=${TAGS}" >> "${GITHUB_ENV}"
- name: Build
if: matrix.os != 'android'
if: matrix.os != 'darwin' && matrix.os != 'android'
run: |
set -xeuo pipefail
mkdir -p dist
@ -165,6 +165,23 @@ jobs:
GOMIPS: ${{ matrix.gomips }}
GOMIPS64: ${{ matrix.gomips }}
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
- name: Build darwin
if: matrix.os == 'darwin'
run: |
set -xeuo pipefail
mkdir -p dist
go build -v -trimpath -o dist/sing-box -tags "${BUILD_TAGS}" \
-ldflags '-s -buildid= -X github.com/sagernet/sing-box/constant.Version=${{ needs.calculate_version.outputs.version }} -checklinkname=0' \
./cmd/sing-box
env:
CGO_ENABLED: "0"
GOOS: ${{ matrix.os }}
GOARCH: ${{ matrix.arch }}
GO386: ${{ matrix.go386 }}
GOARM: ${{ matrix.goarm }}
GOMIPS: ${{ matrix.gomips }}
GOMIPS64: ${{ matrix.gomips }}
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
- name: Build Android
if: matrix.os == 'android'
run: |

2
Makefile
View File

@ -6,7 +6,7 @@ GOHOSTOS = $(shell go env GOHOSTOS)
GOHOSTARCH = $(shell go env GOHOSTARCH)
VERSION=$(shell CGO_ENABLED=0 GOOS=$(GOHOSTOS) GOARCH=$(GOHOSTARCH) go run github.com/sagernet/sing-box/cmd/internal/read_tag@latest)
PARAMS = -v -trimpath -ldflags "-X 'github.com/sagernet/sing-box/constant.Version=$(VERSION)' -s -w -buildid="
PARAMS = -v -trimpath -ldflags "-X 'github.com/sagernet/sing-box/constant.Version=$(VERSION)' -s -w -buildid= -checklinkname=0"
MAIN_PARAMS = $(PARAMS) -tags "$(TAGS)"
MAIN = ./cmd/sing-box
PREFIX ?= $(shell go env GOPATH)

16
adapter/outbound/manager.go
View File

@ -56,6 +56,14 @@ func (m *Manager) Start(stage adapter.StartStage) error {
m.started = true
m.stage = stage
if stage == adapter.StartStateStart {
if m.defaultTag != "" && m.defaultOutbound == nil {
defaultEndpoint, loaded := m.endpoint.Get(m.defaultTag)
if !loaded {
m.access.Unlock()
return E.New("default outbound not found: ", m.defaultTag)
}
m.defaultOutbound = defaultEndpoint
}
if m.defaultOutbound == nil {
directOutbound, err := m.defaultOutboundFallback()
if err != nil {
@ -66,14 +74,6 @@ func (m *Manager) Start(stage adapter.StartStage) error {
m.outboundByTag[directOutbound.Tag()] = directOutbound
m.defaultOutbound = directOutbound
}
if m.defaultTag != "" && m.defaultOutbound == nil {
defaultEndpoint, loaded := m.endpoint.Get(m.defaultTag)
if !loaded {
m.access.Unlock()
return E.New("default outbound not found: ", m.defaultTag)
}
m.defaultOutbound = defaultEndpoint
}
outbounds := m.outbounds
m.access.Unlock()
return m.startOutbounds(append(outbounds, common.Map(m.endpoint.Endpoints(), func(it adapter.Endpoint) adapter.Outbound { return it })...))

7
box.go
View File

@ -323,13 +323,14 @@ func New(options Options) (*Box, error) {
option.DirectOutboundOptions{},
)
})
dnsTransportManager.Initialize(common.Must1(
local.NewTransport(
dnsTransportManager.Initialize(func() (adapter.DNSTransport, error) {
return local.NewTransport(
ctx,
logFactory.NewLogger("dns/local"),
"local",
option.LocalDNSServerOptions{},
)))
)
})
if platformInterface != nil {
err = platformInterface.Initialize(networkManager)
if err != nil {

18
cmd/internal/build_libbox/main.go
View File

@ -59,8 +59,8 @@ func init() {
if err != nil {
currentTag = "unknown"
}
sharedFlags = append(sharedFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag+" -s -w -buildid=")
debugFlags = append(debugFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag)
sharedFlags = append(sharedFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag+" -s -w -buildid= -checklinkname=0")
debugFlags = append(debugFlags, "-ldflags", "-X github.com/sagernet/sing-box/constant.Version="+currentTag+"-s -w -buildid= -checklinkname=0")
sharedTags = append(sharedTags, "with_gvisor", "with_quic", "with_wireguard", "with_utls", "with_clash_api", "with_conntrack")
darwinTags = append(darwinTags, "with_dhcp")
@ -106,19 +106,17 @@ func buildAndroid() {
"-libname=box",
}
if !debugEnabled {
sharedFlags[3] = sharedFlags[3] + " -checklinkname=0"
args = append(args, sharedFlags...)
} else {
debugFlags[1] = debugFlags[1] + " -checklinkname=0"
args = append(args, debugFlags...)
}
tags := append(sharedTags, memcTags...)
if debugEnabled {
tags = append(tags, debugTags...)
}
if !debugEnabled {
args = append(args, sharedFlags...)
} else {
args = append(args, debugFlags...)
}
args = append(args, "-tags", strings.Join(tags, ","))
args = append(args, "./experimental/libbox")

11
dns/transport/local/local.go
View File

@ -20,6 +20,10 @@ import (
mDNS "github.com/miekg/dns"
)
func RegisterTransport(registry *dns.TransportRegistry) {
dns.RegisterTransport[option.LocalDNSServerOptions](registry, C.DNSTypeLocal, NewTransport)
}
var _ adapter.DNSTransport = (*Transport)(nil)
type Transport struct {
@ -28,10 +32,14 @@ type Transport struct {
logger logger.ContextLogger
hosts *hosts.File
dialer N.Dialer
preferGo bool
resolved ResolvedResolver
}
func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.LocalDNSServerOptions) (adapter.DNSTransport, error) {
if C.IsDarwin && !options.PreferGo {
return NewResolvTransport(ctx, logger, tag)
}
transportDialer, err := dns.NewLocalDialer(ctx, options)
if err != nil {
return nil, err
@ -42,12 +50,14 @@ func NewTransport(ctx context.Context, logger log.ContextLogger, tag string, opt
logger: logger,
hosts: hosts.NewFile(hosts.DefaultPath),
dialer: transportDialer,
preferGo: options.PreferGo,
}, nil
}
func (t *Transport) Start(stage adapter.StartStage) error {
switch stage {
case adapter.StartStateInitialize:
if !t.preferGo {
resolvedResolver, err := NewResolvedResolver(t.ctx, t.logger)
if err == nil {
err = resolvedResolver.Start()
@ -58,6 +68,7 @@ func (t *Transport) Start(stage adapter.StartStage) error {
}
}
}
}
return nil
}

209
dns/transport/local/local_fallback.go
View File

@ -1,209 +0,0 @@
package local
import (
"context"
"errors"
"net"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/dns"
"github.com/sagernet/sing-box/experimental/libbox/platform"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/service"
mDNS "github.com/miekg/dns"
)
func RegisterTransport(registry *dns.TransportRegistry) {
dns.RegisterTransport[option.LocalDNSServerOptions](registry, C.DNSTypeLocal, NewFallbackTransport)
}
type FallbackTransport struct {
adapter.DNSTransport
ctx context.Context
fallback bool
resolver net.Resolver
}
func NewFallbackTransport(ctx context.Context, logger log.ContextLogger, tag string, options option.LocalDNSServerOptions) (adapter.DNSTransport, error) {
transport, err := NewTransport(ctx, logger, tag, options)
if err != nil {
return nil, err
}
platformInterface := service.FromContext[platform.Interface](ctx)
if platformInterface == nil {
return transport, nil
}
return &FallbackTransport{
DNSTransport: transport,
ctx: ctx,
}, nil
}
func (f *FallbackTransport) Start(stage adapter.StartStage) error {
err := f.DNSTransport.Start(stage)
if err != nil {
return err
}
if stage != adapter.StartStatePostStart {
return nil
}
inboundManager := service.FromContext[adapter.InboundManager](f.ctx)
for _, inbound := range inboundManager.Inbounds() {
if inbound.Type() == C.TypeTun {
// platform tun hijacks DNS, so we can only use cgo resolver here
f.fallback = true
break
}
}
return nil
}
func (f *FallbackTransport) Close() error {
return f.DNSTransport.Close()
}
func (f *FallbackTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
if !f.fallback {
return f.DNSTransport.Exchange(ctx, message)
}
question := message.Question[0]
domain := dns.FqdnToDomain(question.Name)
if question.Qtype == mDNS.TypeA || question.Qtype == mDNS.TypeAAAA {
var network string
if question.Qtype == mDNS.TypeA {
network = "ip4"
} else {
network = "ip6"
}
addresses, err := f.resolver.LookupNetIP(ctx, network, domain)
if err != nil {
var dnsError *net.DNSError
if errors.As(err, &dnsError) && dnsError.IsNotFound {
return nil, dns.RcodeRefused
}
return nil, err
}
return dns.FixedResponse(message.Id, question, addresses, C.DefaultDNSTTL), nil
} else if question.Qtype == mDNS.TypeNS {
records, err := f.resolver.LookupNS(ctx, domain)
if err != nil {
var dnsError *net.DNSError
if errors.As(err, &dnsError) && dnsError.IsNotFound {
return nil, dns.RcodeRefused
}
return nil, err
}
response := &mDNS.Msg{
MsgHdr: mDNS.MsgHdr{
Id: message.Id,
Rcode: mDNS.RcodeSuccess,
Response: true,
},
Question: []mDNS.Question{question},
}
for _, record := range records {
response.Answer = append(response.Answer, &mDNS.NS{
Hdr: mDNS.RR_Header{
Name: question.Name,
Rrtype: mDNS.TypeNS,
Class: mDNS.ClassINET,
Ttl: C.DefaultDNSTTL,
},
Ns: record.Host,
})
}
return response, nil
} else if question.Qtype == mDNS.TypeCNAME {
cname, err := f.resolver.LookupCNAME(ctx, domain)
if err != nil {
var dnsError *net.DNSError
if errors.As(err, &dnsError) && dnsError.IsNotFound {
return nil, dns.RcodeRefused
}
return nil, err
}
return &mDNS.Msg{
MsgHdr: mDNS.MsgHdr{
Id: message.Id,
Rcode: mDNS.RcodeSuccess,
Response: true,
},
Question: []mDNS.Question{question},
Answer: []mDNS.RR{
&mDNS.CNAME{
Hdr: mDNS.RR_Header{
Name: question.Name,
Rrtype: mDNS.TypeCNAME,
Class: mDNS.ClassINET,
Ttl: C.DefaultDNSTTL,
},
Target: cname,
},
},
}, nil
} else if question.Qtype == mDNS.TypeTXT {
records, err := f.resolver.LookupTXT(ctx, domain)
if err != nil {
var dnsError *net.DNSError
if errors.As(err, &dnsError) && dnsError.IsNotFound {
return nil, dns.RcodeRefused
}
return nil, err
}
return &mDNS.Msg{
MsgHdr: mDNS.MsgHdr{
Id: message.Id,
Rcode: mDNS.RcodeSuccess,
Response: true,
},
Question: []mDNS.Question{question},
Answer: []mDNS.RR{
&mDNS.TXT{
Hdr: mDNS.RR_Header{
Name: question.Name,
Rrtype: mDNS.TypeCNAME,
Class: mDNS.ClassINET,
Ttl: C.DefaultDNSTTL,
},
Txt: records,
},
},
}, nil
} else if question.Qtype == mDNS.TypeMX {
records, err := f.resolver.LookupMX(ctx, domain)
if err != nil {
var dnsError *net.DNSError
if errors.As(err, &dnsError) && dnsError.IsNotFound {
return nil, dns.RcodeRefused
}
return nil, err
}
response := &mDNS.Msg{
MsgHdr: mDNS.MsgHdr{
Id: message.Id,
Rcode: mDNS.RcodeSuccess,
Response: true,
},
Question: []mDNS.Question{question},
}
for _, record := range records {
response.Answer = append(response.Answer, &mDNS.MX{
Hdr: mDNS.RR_Header{
Name: question.Name,
Rrtype: mDNS.TypeA,
Class: mDNS.ClassINET,
Ttl: C.DefaultDNSTTL,
},
Preference: record.Pref,
Mx: record.Host,
})
}
return response, nil
} else {
return nil, E.New("only A, AAAA, NS, CNAME, TXT, MX queries are supported on current platform when using TUN, please switch to a fixed DNS server.")
}
}

46
dns/transport/local/local_resolv.go Normal file
View File

@ -0,0 +1,46 @@
//go:build darwin
package local
import (
"context"
"github.com/sagernet/sing-box/adapter"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/dns"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing/common/logger"
mDNS "github.com/miekg/dns"
)
var _ adapter.DNSTransport = (*ResolvTransport)(nil)
type ResolvTransport struct {
dns.TransportAdapter
ctx context.Context
logger logger.ContextLogger
}
func NewResolvTransport(ctx context.Context, logger log.ContextLogger, tag string) (adapter.DNSTransport, error) {
return &ResolvTransport{
TransportAdapter: dns.NewTransportAdapter(C.DNSTypeLocal, tag, nil),
ctx: ctx,
logger: logger,
}, nil
}
func (t *ResolvTransport) Start(stage adapter.StartStage) error {
return nil
}
func (t *ResolvTransport) Close() error {
return nil
}
func (t *ResolvTransport) Exchange(ctx context.Context, message *mDNS.Msg) (*mDNS.Msg, error) {
question := message.Question[0]
return doBlockingWithCtx(ctx, func() (*mDNS.Msg, error) {
return cgoResSearch(question.Name, int(question.Qtype), int(question.Qclass))
})
}

170
dns/transport/local/local_resolv_linkname.go Normal file
View File

@ -0,0 +1,170 @@
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build darwin
package local
import (
"context"
"errors"
"runtime"
"syscall"
"unsafe"
_ "unsafe"
E "github.com/sagernet/sing/common/exceptions"
mDNS "github.com/miekg/dns"
)
type (
_C_char = byte
_C_int = int32
_C_uchar = byte
_C_ushort = uint16
_C_uint = uint32
_C_ulong = uint64
_C_struct___res_state = ResState
_C_struct_sockaddr = syscall.RawSockaddr
)
func _C_free(p unsafe.Pointer) { runtime.KeepAlive(p) }
func _C_malloc(n uintptr) unsafe.Pointer {
if n <= 0 {
n = 1
}
return unsafe.Pointer(&make([]byte, n)[0])
}
const (
MAXNS = 3
MAXDNSRCH = 6
)
type ResState struct {
Retrans _C_int
Retry _C_int
Options _C_ulong
Nscount _C_int
Nsaddrlist [MAXNS]_C_struct_sockaddr
Id _C_ushort
Dnsrch [MAXDNSRCH + 1]*_C_char
Defname [256]_C_char
Pfcode _C_ulong
Ndots _C_uint
Nsort _C_uint
stub [128]byte
}
//go:linkname ResNinit internal/syscall/unix.ResNinit
func ResNinit(state *_C_struct___res_state) error
//go:linkname ResNsearch internal/syscall/unix.ResNsearch
func ResNsearch(state *_C_struct___res_state, dname *byte, class, typ int, ans *byte, anslen int) (int, error)
//go:linkname ResNclose internal/syscall/unix.ResNclose
func ResNclose(state *_C_struct___res_state)
//go:linkname GoString internal/syscall/unix.GoString
func GoString(p *byte) string
// doBlockingWithCtx executes a blocking function in a separate goroutine when the provided
// context is cancellable. It is intended for use with calls that don't support context
// cancellation (cgo, syscalls). blocking func may still be running after this function finishes.
// For the duration of the execution of the blocking function, the thread is 'acquired' using [acquireThread],
// blocking might not be executed when the context gets canceled early.
func doBlockingWithCtx[T any](ctx context.Context, blocking func() (T, error)) (T, error) {
if err := acquireThread(ctx); err != nil {
var zero T
return zero, err
}
if ctx.Done() == nil {
defer releaseThread()
return blocking()
}
type result struct {
res T
err error
}
res := make(chan result, 1)
go func() {
defer releaseThread()
var r result
r.res, r.err = blocking()
res <- r
}()
select {
case r := <-res:
return r.res, r.err
case <-ctx.Done():
var zero T
return zero, ctx.Err()
}
}
//go:linkname acquireThread net.acquireThread
func acquireThread(ctx context.Context) error
//go:linkname releaseThread net.releaseThread
func releaseThread()
func cgoResSearch(hostname string, rtype, class int) (*mDNS.Msg, error) {
resStateSize := unsafe.Sizeof(_C_struct___res_state{})
var state *_C_struct___res_state
if resStateSize > 0 {
mem := _C_malloc(resStateSize)
defer _C_free(mem)
memSlice := unsafe.Slice((*byte)(mem), resStateSize)
clear(memSlice)
state = (*_C_struct___res_state)(unsafe.Pointer(&memSlice[0]))
}
if err := ResNinit(state); err != nil {
return nil, errors.New("res_ninit failure: " + err.Error())
}
defer ResNclose(state)
bufSize := maxDNSPacketSize
buf := (*_C_uchar)(_C_malloc(uintptr(bufSize)))
defer _C_free(unsafe.Pointer(buf))
s, err := syscall.BytePtrFromString(hostname)
if err != nil {
return nil, err
}
var size int
for {
size, _ = ResNsearch(state, s, class, rtype, buf, bufSize)
if size <= bufSize || size > 0xffff {
break
}
// Allocate a bigger buffer to fit the entire msg.
_C_free(unsafe.Pointer(buf))
bufSize = size
buf = (*_C_uchar)(_C_malloc(uintptr(bufSize)))
}
var msg mDNS.Msg
if size == -1 {
// macOS's libresolv seems to directly return -1 for responses that are not success responses but are exchanged.
// However, we still need the response, so we fall back to parsing the entire buffer.
err = msg.Unpack(unsafe.Slice(buf, bufSize))
if err != nil {
return nil, E.New("res_nsearch failure")
}
} else {
err = msg.Unpack(unsafe.Slice(buf, size))
if err != nil {
return nil, err
}
}
return &msg, nil
}

15
dns/transport/local/local_resolv_stub.go Normal file
View File

@ -0,0 +1,15 @@
//go:build !darwin
package local
import (
"context"
"os"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/log"
)
func NewResolvTransport(ctx context.Context, logger log.ContextLogger, tag string) (adapter.DNSTransport, error) {
return nil, os.ErrInvalid
}

72
dns/transport/local/resolv_darwin.go Normal file
View File

@ -0,0 +1,72 @@
package local
import (
"context"
"net/netip"
"syscall"
"time"
"unsafe"
E "github.com/sagernet/sing/common/exceptions"
"github.com/miekg/dns"
)
func dnsReadConfig(_ context.Context, _ string) *dnsConfig {
resStateSize := unsafe.Sizeof(_C_struct___res_state{})
var state *_C_struct___res_state
if resStateSize > 0 {
mem := _C_malloc(resStateSize)
defer _C_free(mem)
memSlice := unsafe.Slice((*byte)(mem), resStateSize)
clear(memSlice)
state = (*_C_struct___res_state)(unsafe.Pointer(&memSlice[0]))
}
if err := ResNinit(state); err != nil {
return &dnsConfig{
servers: defaultNS,
search: dnsDefaultSearch(),
ndots: 1,
timeout: 5 * time.Second,
attempts: 2,
err: E.Cause(err, "libresolv initialization failed"),
}
}
defer ResNclose(state)
conf := &dnsConfig{
ndots: 1,
timeout: 5 * time.Second,
attempts: int(state.Retry),
}
for i := 0; i < int(state.Nscount); i++ {
addr := parseRawSockaddr(&state.Nsaddrlist[i])
if addr.IsValid() {
conf.servers = append(conf.servers, addr.String())
}
}
for i := 0; ; i++ {
search := state.Dnsrch[i]
if search == nil {
break
}
name := dns.Fqdn(GoString(search))
if name == "" {
continue
}
conf.search = append(conf.search, name)
}
return conf
}
func parseRawSockaddr(rawSockaddr *syscall.RawSockaddr) netip.Addr {
switch rawSockaddr.Family {
case syscall.AF_INET:
sa := (*syscall.RawSockaddrInet4)(unsafe.Pointer(rawSockaddr))
return netip.AddrFrom4(sa.Addr)
case syscall.AF_INET6:
sa := (*syscall.RawSockaddrInet6)(unsafe.Pointer(rawSockaddr))
return netip.AddrFrom16(sa.Addr)
default:
return netip.Addr{}
}
}

55
dns/transport/local/resolv_darwin_cgo.go
View File

@ -1,55 +0,0 @@
//go:build darwin && cgo
package local
/*
#include <stdlib.h>
#include <stdio.h>
#include <resolv.h>
#include <arpa/inet.h>
*/
import "C"
import (
"context"
"time"
E "github.com/sagernet/sing/common/exceptions"
"github.com/miekg/dns"
)
func dnsReadConfig(_ context.Context, _ string) *dnsConfig {
var state C.struct___res_state
if C.res_ninit(&state) != 0 {
return &dnsConfig{
servers: defaultNS,
search: dnsDefaultSearch(),
ndots: 1,
timeout: 5 * time.Second,
attempts: 2,
err: E.New("libresolv initialization failed"),
}
}
conf := &dnsConfig{
ndots: 1,
timeout: 5 * time.Second,
attempts: int(state.retry),
}
for i := 0; i < int(state.nscount); i++ {
ns := state.nsaddr_list[i]
addr := C.inet_ntoa(ns.sin_addr)
if addr == nil {
continue
}
conf.servers = append(conf.servers, C.GoString(addr))
}
for i := 0; ; i++ {
search := state.dnsrch[i]
if search == nil {
break
}
conf.search = append(conf.search, dns.Fqdn(C.GoString(search)))
}
return conf
}

2
dns/transport/local/resolv_unix.go
View File

@ -1,4 +1,4 @@
//go:build !windows && !(darwin && cgo)
//go:build !windows && !darwin
package local

27
dns/transport_manager.go
View File

@ -30,7 +30,7 @@ type TransportManager struct {
transportByTag map[string]adapter.DNSTransport
dependByTag map[string][]string
defaultTransport adapter.DNSTransport
defaultTransportFallback adapter.DNSTransport
defaultTransportFallback func() (adapter.DNSTransport, error)
fakeIPTransport adapter.FakeIPTransport
}
@ -45,7 +45,7 @@ func NewTransportManager(logger logger.ContextLogger, registry adapter.DNSTransp
}
}
func (m *TransportManager) Initialize(defaultTransportFallback adapter.DNSTransport) {
func (m *TransportManager) Initialize(defaultTransportFallback func() (adapter.DNSTransport, error)) {
m.defaultTransportFallback = defaultTransportFallback
}
@ -56,14 +56,27 @@ func (m *TransportManager) Start(stage adapter.StartStage) error {
}
m.started = true
m.stage = stage
transports := m.transports
m.access.Unlock()
if stage == adapter.StartStateStart {
if m.defaultTag != "" && m.defaultTransport == nil {
m.access.Unlock()
return E.New("default DNS server not found: ", m.defaultTag)
}
return m.startTransports(m.transports)
if m.defaultTransport == nil {
defaultTransport, err := m.defaultTransportFallback()
if err != nil {
m.access.Unlock()
return E.Cause(err, "default DNS server fallback")
}
m.transports = append(m.transports, defaultTransport)
m.transportByTag[defaultTransport.Tag()] = defaultTransport
m.defaultTransport = defaultTransport
}
transports := m.transports
m.access.Unlock()
return m.startTransports(transports)
} else {
transports := m.transports
m.access.Unlock()
for _, outbound := range transports {
err := adapter.LegacyStart(outbound, stage)
if err != nil {
@ -172,11 +185,7 @@ func (m *TransportManager) Transport(tag string) (adapter.DNSTransport, bool) {
func (m *TransportManager) Default() adapter.DNSTransport {
m.access.RLock()
defer m.access.RUnlock()
if m.defaultTransport != nil {
return m.defaultTransport
} else {
return m.defaultTransportFallback
}
}
func (m *TransportManager) FakeIP() adapter.FakeIPTransport {

13
option/dns.go
View File

@ -190,7 +190,7 @@ func (o *DNSServerOptions) Upgrade(ctx context.Context) error {
}
}
remoteOptions := RemoteDNSServerOptions{
LocalDNSServerOptions: LocalDNSServerOptions{
RawLocalDNSServerOptions: RawLocalDNSServerOptions{
DialerOptions: DialerOptions{
Detour: options.Detour,
DomainResolver: &DomainResolveOptions{
@ -211,7 +211,7 @@ func (o *DNSServerOptions) Upgrade(ctx context.Context) error {
switch serverType {
case C.DNSTypeLocal:
o.Type = C.DNSTypeLocal
o.Options = &remoteOptions.LocalDNSServerOptions
o.Options = &remoteOptions.RawLocalDNSServerOptions
case C.DNSTypeUDP:
o.Type = C.DNSTypeUDP
o.Options = &remoteOptions
@ -363,7 +363,7 @@ type HostsDNSServerOptions struct {
Predefined *badjson.TypedMap[string, badoption.Listable[netip.Addr]] `json:"predefined,omitempty"`
}
type LocalDNSServerOptions struct {
type RawLocalDNSServerOptions struct {
DialerOptions
Legacy bool `json:"-"`
LegacyStrategy DomainStrategy `json:"-"`
@ -371,8 +371,13 @@ type LocalDNSServerOptions struct {
LegacyClientSubnet netip.Prefix `json:"-"`
}
type LocalDNSServerOptions struct {
RawLocalDNSServerOptions
PreferGo bool `json:"prefer_go,omitempty"`
}
type RemoteDNSServerOptions struct {
LocalDNSServerOptions
RawLocalDNSServerOptions
DNSServerAddressOptions
LegacyAddressResolver string `json:"-"`
LegacyAddressStrategy DomainStrategy `json:"-"`