directip.go

package main

import (
	"strings"
)

func ipShouldDirect(ip string) (direct bool) {
	if strings.Contains(ip, ":") {
		// IPv6 addresses are connected directly
		return true
	}
	direct = false
	defer func() {
		if r := recover(); r != nil {
			errl.Printf("error judging ip should direct: %s", ip)
		}
	}()
	_, isPrivate := hostIsIP(ip)
	if isPrivate {
		return true
	}
	ipLong, err := ip2long(ip)
	if err != nil {
		return false
	}
	if ipLong == 0 {
		return true
	}
	firstByte := ipLong >> 24
	if CNIPDataRange[firstByte].end == 0 {
		return false
	}
	ipIndex := searchRange(CNIPDataRange[firstByte].start, CNIPDataRange[firstByte].end, func(i int) bool {
		return CNIPDataStart[i] > ipLong
	})
	ipIndex--
	return ipLong <= CNIPDataStart[ipIndex]+(uint32)(CNIPDataNum[ipIndex])
}