clash/adapter/outbound/util.go
2022-04-20 22:52:05 +08:00

81 lines
1.9 KiB
Go

package outbound
import (
"bytes"
"crypto/tls"
xtls "github.com/xtls/go"
"net"
"strconv"
"sync"
"time"
"github.com/Dreamacro/clash/component/resolver"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/transport/socks5"
)
var (
globalClientSessionCache tls.ClientSessionCache
globalClientXSessionCache xtls.ClientSessionCache
once sync.Once
)
func tcpKeepAlive(c net.Conn) {
if tcp, ok := c.(*net.TCPConn); ok {
_ = tcp.SetKeepAlive(true)
_ = tcp.SetKeepAlivePeriod(30 * time.Second)
}
}
func getClientSessionCache() tls.ClientSessionCache {
once.Do(func() {
globalClientSessionCache = tls.NewLRUClientSessionCache(128)
})
return globalClientSessionCache
}
func getClientXSessionCache() xtls.ClientSessionCache {
once.Do(func() {
globalClientXSessionCache = xtls.NewLRUClientSessionCache(128)
})
return globalClientXSessionCache
}
func serializesSocksAddr(metadata *C.Metadata) []byte {
var buf [][]byte
aType := uint8(metadata.AddrType)
p, _ := strconv.ParseUint(metadata.DstPort, 10, 16)
port := []byte{uint8(p >> 8), uint8(p & 0xff)}
switch metadata.AddrType {
case socks5.AtypDomainName:
lenM := uint8(len(metadata.Host))
host := []byte(metadata.Host)
buf = [][]byte{{aType, lenM}, host, port}
case socks5.AtypIPv4:
host := metadata.DstIP.AsSlice()
buf = [][]byte{{aType}, host, port}
case socks5.AtypIPv6:
host := metadata.DstIP.AsSlice()
buf = [][]byte{{aType}, host, port}
}
return bytes.Join(buf, nil)
}
func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
host, port, err := net.SplitHostPort(address)
if err != nil {
return nil, err
}
ip, err := resolver.ResolveProxyServerHost(host)
if err != nil {
return nil, err
}
return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
}
func safeConnClose(c net.Conn, err error) {
if err != nil {
_ = c.Close()
}
}