131 lines
2.9 KiB
Go
131 lines
2.9 KiB
Go
package outbound
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import (
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"bytes"
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"context"
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"crypto/tls"
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"net"
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"net/netip"
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"strconv"
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"sync"
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"time"
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"github.com/Dreamacro/clash/component/resolver"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/transport/socks5"
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)
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var (
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globalClientSessionCache tls.ClientSessionCache
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once sync.Once
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)
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func tcpKeepAlive(c net.Conn) {
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if tcp, ok := c.(*net.TCPConn); ok {
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_ = tcp.SetKeepAlive(true)
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_ = tcp.SetKeepAlivePeriod(30 * time.Second)
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}
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}
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func getClientSessionCache() tls.ClientSessionCache {
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once.Do(func() {
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globalClientSessionCache = tls.NewLRUClientSessionCache(128)
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})
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return globalClientSessionCache
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}
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func serializesSocksAddr(metadata *C.Metadata) []byte {
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var buf [][]byte
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addrType := metadata.AddrType()
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aType := uint8(addrType)
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p, _ := strconv.ParseUint(metadata.DstPort, 10, 16)
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port := []byte{uint8(p >> 8), uint8(p & 0xff)}
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switch addrType {
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case socks5.AtypDomainName:
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lenM := uint8(len(metadata.Host))
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host := []byte(metadata.Host)
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buf = [][]byte{{aType, lenM}, host, port}
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case socks5.AtypIPv4:
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host := metadata.DstIP.AsSlice()
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buf = [][]byte{{aType}, host, port}
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case socks5.AtypIPv6:
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host := metadata.DstIP.AsSlice()
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buf = [][]byte{{aType}, host, port}
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}
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return bytes.Join(buf, nil)
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}
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func resolveUDPAddr(ctx context.Context, network, address string) (*net.UDPAddr, error) {
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host, port, err := net.SplitHostPort(address)
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if err != nil {
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return nil, err
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}
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ip, err := resolver.ResolveProxyServerHost(ctx, host)
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if err != nil {
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return nil, err
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}
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return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
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}
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func resolveUDPAddrWithPrefer(ctx context.Context, network, address string, prefer C.DNSPrefer) (*net.UDPAddr, error) {
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host, port, err := net.SplitHostPort(address)
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if err != nil {
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return nil, err
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}
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var ip netip.Addr
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var fallback netip.Addr
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switch prefer {
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case C.IPv4Only:
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ip, err = resolver.ResolveIPv4ProxyServerHost(ctx, host)
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case C.IPv6Only:
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ip, err = resolver.ResolveIPv6ProxyServerHost(ctx, host)
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case C.IPv6Prefer:
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var ips []netip.Addr
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ips, err = resolver.LookupIPProxyServerHost(ctx, host)
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if err == nil {
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for _, addr := range ips {
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if addr.Is6() {
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ip = addr
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break
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} else {
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if !fallback.IsValid() {
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fallback = addr
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}
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}
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}
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}
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default:
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// C.IPv4Prefer, C.DualStack and other
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var ips []netip.Addr
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ips, err = resolver.LookupIPProxyServerHost(ctx, host)
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if err == nil {
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for _, addr := range ips {
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if addr.Is4() {
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ip = addr
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break
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} else {
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if !fallback.IsValid() {
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fallback = addr
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}
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}
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}
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}
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}
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if !ip.IsValid() && fallback.IsValid() {
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ip = fallback
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}
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if err != nil {
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return nil, err
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}
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return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
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}
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func safeConnClose(c net.Conn, err error) {
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if err != nil && c != nil {
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_ = c.Close()
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}
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}
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