344 lines
8.8 KiB
Go
344 lines
8.8 KiB
Go
package dialer
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import (
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"context"
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"fmt"
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"net"
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"net/netip"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/Dreamacro/clash/component/resolver"
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)
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type dialFunc func(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error)
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var (
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dialMux sync.Mutex
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actualSingleStackDialContext = serialSingleStackDialContext
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actualDualStackDialContext = serialDualStackDialContext
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tcpConcurrent = false
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fallbackTimeout = 300 * time.Millisecond
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)
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func applyOptions(options ...Option) *option {
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opt := &option{
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interfaceName: DefaultInterface.Load(),
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routingMark: int(DefaultRoutingMark.Load()),
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}
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for _, o := range DefaultOptions {
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o(opt)
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}
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for _, o := range options {
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o(opt)
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}
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return opt
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}
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func DialContext(ctx context.Context, network, address string, options ...Option) (net.Conn, error) {
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opt := applyOptions(options...)
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if opt.network == 4 || opt.network == 6 {
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if strings.Contains(network, "tcp") {
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network = "tcp"
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} else {
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network = "udp"
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}
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network = fmt.Sprintf("%s%d", network, opt.network)
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}
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ips, port, err := parseAddr(ctx, network, address, opt.resolver)
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if err != nil {
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return nil, err
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}
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switch network {
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case "tcp4", "tcp6", "udp4", "udp6":
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return actualSingleStackDialContext(ctx, network, ips, port, opt)
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case "tcp", "udp":
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return actualDualStackDialContext(ctx, network, ips, port, opt)
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default:
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return nil, ErrorInvalidedNetworkStack
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}
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}
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func ListenPacket(ctx context.Context, network, address string, options ...Option) (net.PacketConn, error) {
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cfg := applyOptions(options...)
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lc := &net.ListenConfig{}
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if cfg.interfaceName != "" {
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addr, err := bindIfaceToListenConfig(cfg.interfaceName, lc, network, address)
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if err != nil {
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return nil, err
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}
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address = addr
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}
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if cfg.addrReuse {
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addrReuseToListenConfig(lc)
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}
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if cfg.routingMark != 0 {
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bindMarkToListenConfig(cfg.routingMark, lc, network, address)
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}
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return lc.ListenPacket(ctx, network, address)
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}
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func SetTcpConcurrent(concurrent bool) {
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dialMux.Lock()
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defer dialMux.Unlock()
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tcpConcurrent = concurrent
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if concurrent {
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actualSingleStackDialContext = concurrentSingleStackDialContext
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actualDualStackDialContext = concurrentDualStackDialContext
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} else {
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actualSingleStackDialContext = serialSingleStackDialContext
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actualDualStackDialContext = serialDualStackDialContext
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}
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}
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func GetTcpConcurrent() bool {
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dialMux.Lock()
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defer dialMux.Unlock()
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return tcpConcurrent
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}
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func dialContext(ctx context.Context, network string, destination netip.Addr, port string, opt *option) (net.Conn, error) {
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address := net.JoinHostPort(destination.String(), port)
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netDialer := opt.netDialer
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switch netDialer.(type) {
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case nil:
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netDialer = &net.Dialer{}
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case *net.Dialer:
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netDialer = &*netDialer.(*net.Dialer) // make a copy
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default:
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return netDialer.DialContext(ctx, network, address)
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}
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dialer := netDialer.(*net.Dialer)
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if opt.interfaceName != "" {
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if err := bindIfaceToDialer(opt.interfaceName, dialer, network, destination); err != nil {
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return nil, err
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}
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}
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if opt.routingMark != 0 {
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bindMarkToDialer(opt.routingMark, dialer, network, destination)
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}
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if opt.tfo {
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return dialTFO(ctx, *dialer, network, address)
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}
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return dialer.DialContext(ctx, network, address)
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}
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func serialSingleStackDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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return serialDialContext(ctx, network, ips, port, opt)
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}
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func serialDualStackDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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return dualStackDialContext(ctx, serialDialContext, network, ips, port, opt)
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}
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func concurrentSingleStackDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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return parallelDialContext(ctx, network, ips, port, opt)
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}
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func concurrentDualStackDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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if opt.prefer != 4 && opt.prefer != 6 {
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return parallelDialContext(ctx, network, ips, port, opt)
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}
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return dualStackDialContext(ctx, parallelDialContext, network, ips, port, opt)
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}
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func dualStackDialContext(ctx context.Context, dialFn dialFunc, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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ipv4s, ipv6s := sortationAddr(ips)
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preferIPVersion := opt.prefer
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fallbackTicker := time.NewTicker(fallbackTimeout)
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defer fallbackTicker.Stop()
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results := make(chan dialResult)
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returned := make(chan struct{})
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defer close(returned)
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racer := func(ips []netip.Addr, isPrimary bool) {
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result := dialResult{isPrimary: isPrimary}
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defer func() {
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select {
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case results <- result:
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case <-returned:
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if result.Conn != nil && result.error == nil {
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_ = result.Conn.Close()
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}
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}
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}()
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result.Conn, result.error = dialFn(ctx, network, ips, port, opt)
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}
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go racer(ipv4s, preferIPVersion != 6)
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go racer(ipv6s, preferIPVersion != 4)
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var fallback dialResult
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var err error
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for {
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select {
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case <-ctx.Done():
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if fallback.error == nil && fallback.Conn != nil {
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return fallback.Conn, nil
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}
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return nil, fmt.Errorf("dual stack connect failed: %w", err)
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case <-fallbackTicker.C:
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if fallback.error == nil && fallback.Conn != nil {
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return fallback.Conn, nil
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}
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case res := <-results:
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if res.error == nil {
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if res.isPrimary {
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return res.Conn, nil
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}
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fallback = res
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} else {
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err = res.error
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}
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}
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}
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}
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func parallelDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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if len(ips) == 0 {
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return nil, ErrorNoIpAddress
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}
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results := make(chan dialResult)
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returned := make(chan struct{})
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defer close(returned)
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racer := func(ctx context.Context, ip netip.Addr) {
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result := dialResult{isPrimary: true}
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defer func() {
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select {
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case results <- result:
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case <-returned:
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if result.Conn != nil && result.error == nil {
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_ = result.Conn.Close()
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}
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}
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}()
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result.ip = ip
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result.Conn, result.error = dialContext(ctx, network, ip, port, opt)
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}
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for _, ip := range ips {
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go racer(ctx, ip)
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}
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var err error
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for {
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select {
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case <-ctx.Done():
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if err != nil {
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return nil, err
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}
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if ctx.Err() == context.DeadlineExceeded {
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return nil, os.ErrDeadlineExceeded
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}
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return nil, ctx.Err()
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case res := <-results:
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if res.error == nil {
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return res.Conn, nil
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}
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err = res.error
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}
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}
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}
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func serialDialContext(ctx context.Context, network string, ips []netip.Addr, port string, opt *option) (net.Conn, error) {
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if len(ips) == 0 {
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return nil, ErrorNoIpAddress
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}
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var errs []error
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for _, ip := range ips {
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if conn, err := dialContext(ctx, network, ip, port, opt); err == nil {
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return conn, nil
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} else {
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errs = append(errs, err)
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}
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}
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return nil, errorsJoin(errs...)
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}
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type dialResult struct {
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ip netip.Addr
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net.Conn
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error
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isPrimary bool
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}
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func parseAddr(ctx context.Context, network, address string, preferResolver resolver.Resolver) ([]netip.Addr, string, error) {
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host, port, err := net.SplitHostPort(address)
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if err != nil {
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return nil, "-1", err
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}
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var ips []netip.Addr
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switch network {
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case "tcp4", "udp4":
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if preferResolver == nil {
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ips, err = resolver.LookupIPv4ProxyServerHost(ctx, host)
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} else {
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ips, err = resolver.LookupIPv4WithResolver(ctx, host, preferResolver)
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}
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case "tcp6", "udp6":
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if preferResolver == nil {
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ips, err = resolver.LookupIPv6ProxyServerHost(ctx, host)
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} else {
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ips, err = resolver.LookupIPv6WithResolver(ctx, host, preferResolver)
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}
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default:
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if preferResolver == nil {
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ips, err = resolver.LookupIPProxyServerHost(ctx, host)
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} else {
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ips, err = resolver.LookupIPWithResolver(ctx, host, preferResolver)
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}
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}
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if err != nil {
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return nil, "-1", fmt.Errorf("dns resolve failed: %w", err)
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}
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for i, ip := range ips {
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if ip.Is4In6() {
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ips[i] = ip.Unmap()
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}
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}
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return ips, port, nil
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}
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func sortationAddr(ips []netip.Addr) (ipv4s, ipv6s []netip.Addr) {
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for _, v := range ips {
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if v.Is4() { // 4in6 parse was in parseAddr
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ipv4s = append(ipv4s, v)
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} else {
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ipv6s = append(ipv6s, v)
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}
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}
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return
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}
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type Dialer struct {
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opt option
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}
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func (d Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
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return DialContext(ctx, network, address, WithOption(d.opt))
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}
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func (d Dialer) ListenPacket(ctx context.Context, network, address string, rAddrPort netip.AddrPort) (net.PacketConn, error) {
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opt := WithOption(d.opt)
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if rAddrPort.Addr().Unmap().IsLoopback() {
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// avoid "The requested address is not valid in its context."
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opt = WithInterface("")
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}
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return ListenPacket(ctx, ParseNetwork(network, rAddrPort.Addr()), address, opt)
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}
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func NewDialer(options ...Option) Dialer {
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opt := applyOptions(options...)
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return Dialer{opt: *opt}
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}
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