Clash.Meta/adapters/outboundgroup/util.go

package outboundgroup

import (
	"fmt"
	"net"
	"time"

	C "github.com/Dreamacro/clash/constant"
)

func addrToMetadata(rawAddress string) (addr *C.Metadata, err error) {
	host, port, err := net.SplitHostPort(rawAddress)
	if err != nil {
		err = fmt.Errorf("addrToMetadata failed: %w", err)
		return
	}

	ip := net.ParseIP(host)
	if ip != nil {
		if ip.To4() != nil {
			addr = &C.Metadata{
				AddrType: C.AtypIPv4,
				Host:     "",
				DstIP:    ip,
				DstPort:  port,
			}
			return
		} else {
			addr = &C.Metadata{
				AddrType: C.AtypIPv6,
				Host:     "",
				DstIP:    ip,
				DstPort:  port,
			}
			return
		}
	} else {
		addr = &C.Metadata{
			AddrType: C.AtypDomainName,
			Host:     host,
			DstIP:    nil,
			DstPort:  port,
		}
		return
	}
}

func tcpKeepAlive(c net.Conn) {
	if tcp, ok := c.(*net.TCPConn); ok {
		tcp.SetKeepAlive(true)
		tcp.SetKeepAlivePeriod(30 * time.Second)
	}
}